using AxCopilot.Models;
using AxCopilot.Services;
using System.Text.Json;

namespace AxCopilot.Services.Agent;

public partial class AgentLoopService
{
    private bool TryHandleContextOverflowTransition(
        Exception ex,
        List<ChatMessage> messages,
        RunState runState)
    {
        if (!IsContextOverflowError(ex.Message) || runState.ContextRecoveryAttempts >= 2)
            return false;

        runState.ContextRecoveryAttempts++;
        var recovered = ForceContextRecovery(messages);
        EmitEvent(
            AgentEventType.Thinking,
            "",
            recovered
                ? $"컨텍스트 초과를 감지해 자동 복구 후 재시도합니다 ({runState.ContextRecoveryAttempts}/2)"
                : $"컨텍스트 초과를 감지했지만 복구할 충분한 이력이 없어 재시도하지 못했습니다 ({runState.ContextRecoveryAttempts}/2)");
        return recovered;
    }

    private bool TryHandleWithheldResponseTransition(
        string? textResponse,
        List<ChatMessage> messages,
        RunState runState)
    {
        if (string.IsNullOrWhiteSpace(textResponse))
            return false;
        if (!IsLikelyWithheldOrOverflowResponse(textResponse))
            return false;
        if (runState.WithheldRecoveryAttempts >= 2)
            return false;

        runState.WithheldRecoveryAttempts++;
        var recovered = ForceContextRecovery(messages);
        messages.Add(new ChatMessage
        {
            Role = "user",
            Content = "[System:WithheldRecovery] 직전 응답이 길이/토큰 한계로 중단된 것으로 보입니다. " +
                      "컨텍스트를 정리했으니 직전 작업을 이어서 진행하세요. " +
                      "필요하면 먼저 핵심만 요약하고 다음 도구 호출로 진행하세요."
        });
        EmitEvent(
            AgentEventType.Thinking,
            "",
            recovered
                ? $"withheld/길이 제한 응답을 감지해 컨텍스트를 복구하고 재시도합니다 ({runState.WithheldRecoveryAttempts}/2)"
                : $"withheld/길이 제한 응답을 감지해 최소 지시로 재시도합니다 ({runState.WithheldRecoveryAttempts}/2)");
        return true;
    }

    private bool TryApplyCodeCompletionGateTransition(
        List<ChatMessage> messages,
        string? textResponse,
        TaskTypePolicy taskPolicy,
        bool requireHighImpactCodeVerification,
        int totalToolCalls,
        RunState runState)
    {
        if (!string.Equals(ActiveTab, "Code", StringComparison.OrdinalIgnoreCase) || totalToolCalls <= 0)
            return false;

        var hasCodeVerificationEvidence = HasCodeVerificationEvidenceAfterLastModification(
            messages,
            requireHighImpactCodeVerification);
        if (!hasCodeVerificationEvidence && runState.CodeVerificationGateRetry < 2)
        {
            runState.CodeVerificationGateRetry++;
            if (!string.IsNullOrEmpty(textResponse))
                messages.Add(new ChatMessage { Role = "assistant", Content = textResponse });
            messages.Add(new ChatMessage
            {
                Role = "user",
                Content = requireHighImpactCodeVerification
                    ? "[System:CodeQualityGate] 怨듭슜/?듭떖 肄붾뱶 ?섏젙 ?댄썑 寃€利?洹쇨굅媛€ 遺€議깊빀?덈떎. 醫낅즺?섏? 留먭퀬 file_read, grep/glob, git diff, build/test源뚯? ?뺣낫???ㅼ뿉留?留덈Т由ы븯?몄슂."
                    : "[System:CodeQualityGate] 留덉?留?肄붾뱶 ?섏젙 ?댄썑 build/test/file_read/diff 洹쇨굅媛€ 遺€議깊빀?덈떎. 醫낅즺?섏? 留먭퀬 寃€利?洹쇨굅瑜??뺣낫???ㅼ뿉留?留덈Т由ы븯?몄슂."
            });
            EmitEvent(AgentEventType.Thinking, "", requireHighImpactCodeVerification
                ? "怨좎쁺??肄붾뱶 蹂€寃쎌쓽 寃€利?洹쇨굅媛€ 遺€議깊빐 異붽? 寃€利앹쓣 吏꾪뻾?⑸땲??.."
                : "肄붾뱶 寃곌낵 寃€利?洹쇨굅媛€ 遺€議깊빐 異붽? 寃€利앹쓣 吏꾪뻾?⑸땲??..");
            return true;
        }

        if (requireHighImpactCodeVerification
            && !HasSuccessfulBuildAndTestAfterLastModification(messages)
            && runState.HighImpactBuildTestGateRetry < 1)
        {
            runState.HighImpactBuildTestGateRetry++;
            if (!string.IsNullOrEmpty(textResponse))
                messages.Add(new ChatMessage { Role = "assistant", Content = textResponse });
            messages.Add(new ChatMessage
            {
                Role = "user",
                Content = "[System:HighImpactBuildTestGate] 怨좎쁺??肄붾뱶 蹂€寃쎌엯?덈떎. " +
                          "醫낅즺?섏? 留먭퀬 build_run怨?test_loop瑜?紐⑤몢 ?ㅽ뻾???깃났 洹쇨굅瑜??뺣낫???ㅼ뿉留?留덈Т由ы븯?몄슂."
            });
            EmitEvent(AgentEventType.Thinking, "", "怨좎쁺??蹂€寃쎌씠??build+test ?깃났 洹쇨굅瑜?紐⑤몢 ?뺣낫???뚭퉴吏€ 吏꾪뻾?⑸땲??..");
            return true;
        }

        if (!HasSufficientFinalReportEvidence(textResponse, taskPolicy, requireHighImpactCodeVerification, messages)
            && runState.FinalReportGateRetry < 1)
        {
            runState.FinalReportGateRetry++;
            if (!string.IsNullOrEmpty(textResponse))
                messages.Add(new ChatMessage { Role = "assistant", Content = textResponse });
            messages.Add(new ChatMessage
            {
                Role = "user",
                Content = BuildFinalReportQualityPrompt(taskPolicy, requireHighImpactCodeVerification)
            });
            EmitEvent(AgentEventType.Thinking, "", "理쒖쥌 蹂닿퀬??蹂€寃?寃€利?由ъ뒪???붿빟??遺€議깊빐 ??踰????뺣━?⑸땲??..");
            return true;
        }

        return false;
    }

    private bool TryApplyCodeDiffEvidenceGateTransition(
        List<ChatMessage> messages,
        string? textResponse,
        RunState runState)
    {
        if (!string.Equals(ActiveTab, "Code", StringComparison.OrdinalIgnoreCase))
            return false;

        if (runState.CodeDiffGateRetry >= 1)
            return false;

        if (HasDiffEvidenceAfterLastModification(messages))
            return false;

        runState.CodeDiffGateRetry++;
        if (!string.IsNullOrEmpty(textResponse))
            messages.Add(new ChatMessage { Role = "assistant", Content = textResponse });
        messages.Add(new ChatMessage
        {
            Role = "user",
            Content = "[System:CodeDiffGate] 肄붾뱶 蹂€寃??댄썑 diff 洹쇨굅媛€ 遺€議깊빀?덈떎. " +
                      "git_tool ?꾧뎄濡?蹂€寃??뚯씪怨??듭떖 diff瑜?癒쇱? ?뺤씤?섍퀬 ?붿빟?섏꽭?? " +
                      "吏€湲?利됱떆 git_tool ?꾧뎄瑜??몄텧?섏꽭??"
        });
        EmitEvent(AgentEventType.Thinking, "", "肄붾뱶 diff 洹쇨굅媛€ 遺€議깊빐 git diff 寃€利앹쓣 異붽??⑸땲??..");
        return true;
    }

    private bool TryApplyRecentExecutionEvidenceGateTransition(
        List<ChatMessage> messages,
        string? textResponse,
        TaskTypePolicy taskPolicy,
        RunState runState)
    {
        if (!string.Equals(ActiveTab, "Code", StringComparison.OrdinalIgnoreCase))
            return false;

        if (runState.RecentExecutionGateRetry >= 1)
            return false;

        if (!HasAnyBuildOrTestEvidence(messages))
            return false;

        if (HasBuildOrTestEvidenceAfterLastModification(messages))
            return false;

        runState.RecentExecutionGateRetry++;
        if (!string.IsNullOrEmpty(textResponse))
            messages.Add(new ChatMessage { Role = "assistant", Content = textResponse });
        messages.Add(new ChatMessage
        {
            Role = "user",
            Content = BuildRecentExecutionEvidencePrompt(taskPolicy)
        });
        EmitEvent(AgentEventType.Thinking, "", "理쒓렐 ?섏젙 ?댄썑 ?ㅽ뻾 洹쇨굅媛€ 遺€議깊빐 build/test ?ш?利앹쓣 ?섑뻾?⑸땲??..");
        return true;
    }

    private bool TryApplyExecutionSuccessGateTransition(
        List<ChatMessage> messages,
        string? textResponse,
        TaskTypePolicy taskPolicy,
        RunState runState)
    {
        if (!string.Equals(ActiveTab, "Code", StringComparison.OrdinalIgnoreCase))
            return false;

        if (runState.ExecutionSuccessGateRetry >= 1)
            return false;

        if (!HasAnyBuildOrTestAttempt(messages))
            return false;

        if (HasAnyBuildOrTestEvidence(messages))
            return false;

        runState.ExecutionSuccessGateRetry++;
        if (!string.IsNullOrEmpty(textResponse))
            messages.Add(new ChatMessage { Role = "assistant", Content = textResponse });
        messages.Add(new ChatMessage
        {
            Role = "user",
            Content = BuildExecutionSuccessGatePrompt(taskPolicy)
        });
        EmitEvent(AgentEventType.Thinking, "", "?ㅽ뙣???ㅽ뻾 洹쇨굅留??덉뼱 build/test瑜??ㅼ떆 ?깃났?쒖폒 寃€利앺빀?덈떎...");
        return true;
    }

    private bool TryApplyTerminalEvidenceGateTransition(
        List<ChatMessage> messages,
        string? textResponse,
        TaskTypePolicy taskPolicy,
        string userQuery,
        int totalToolCalls,
        string? lastArtifactFilePath,
        RunState runState)
    {
        if (totalToolCalls <= 0)
            return false;

        if (ShouldSkipTerminalEvidenceGateForAnalysisQuery(userQuery, taskPolicy))
            return false;

        var retryMax = GetTerminalEvidenceGateMaxRetries();
        if (runState.TerminalEvidenceGateRetry >= retryMax)
            return false;

        if (HasTerminalProgressEvidence(taskPolicy, messages, lastArtifactFilePath))
            return false;

        runState.TerminalEvidenceGateRetry++;
        if (!string.IsNullOrEmpty(textResponse))
            messages.Add(new ChatMessage { Role = "assistant", Content = textResponse });
        messages.Add(new ChatMessage
        {
            Role = "user",
            Content = BuildTerminalEvidenceGatePrompt(taskPolicy, lastArtifactFilePath)
        });
        EmitEvent(
            AgentEventType.Thinking,
            "",
            $"醫낅즺 ???ㅽ뻾 利앷굅媛€ 遺€議깊빐 蹂닿컯 ?④퀎瑜?吏꾪뻾?⑸땲??({runState.TerminalEvidenceGateRetry}/{retryMax})");
        return true;
    }

    private static bool ShouldSkipTerminalEvidenceGateForAnalysisQuery(string userQuery, TaskTypePolicy taskPolicy)
    {
        if (string.Equals(taskPolicy.TaskType, "docs", StringComparison.OrdinalIgnoreCase))
            return false;

        if (string.IsNullOrWhiteSpace(userQuery))
            return false;

        return ContainsAny(
            userQuery,
            "설명",
            "분석",
            "요약",
            "리뷰",
            "explain",
            "analyze",
            "summary",
            "review");
    }

    private static bool HasTerminalProgressEvidence(
        TaskTypePolicy taskPolicy,
        List<ChatMessage> messages,
        string? lastArtifactFilePath)
    {
        if (string.Equals(taskPolicy.TaskType, "docs", StringComparison.OrdinalIgnoreCase))
        {
            return HasMaterializedArtifact(lastArtifactFilePath)
                   && HasDocumentVerificationEvidenceAfterLastArtifact(messages);
        }

        return HasAnySuccessfulProgressToolResult(messages)
               || HasMaterializedArtifact(lastArtifactFilePath);
    }

    private static bool HasAnySuccessfulProgressToolResult(List<ChatMessage> messages)
    {
        foreach (var message in messages.AsEnumerable().Reverse())
        {
            if (!TryGetToolResultInfo(message, out var toolName, out var content))
                continue;

            if (!IsMutatingOrExecutionProgressTool(toolName))
                continue;

            if (IsLikelyFailureContent(content))
                continue;

            return true;
        }

        return false;
    }

    private static string BuildTerminalEvidenceGatePrompt(TaskTypePolicy taskPolicy, string? lastArtifactFilePath)
    {
        if (string.Equals(taskPolicy.TaskType, "docs", StringComparison.OrdinalIgnoreCase))
        {
            var fileHint = string.IsNullOrWhiteSpace(lastArtifactFilePath) ? "寃곌낵 臾몄꽌 ?뚯씪" : $"'{lastArtifactFilePath}'";
            return "[System:TerminalEvidenceGate] ?꾩옱 醫낅즺 ?묐떟?먮뒗 ?ㅽ뻾 寃곌낵 利앷굅媛€ 遺€議깊빀?덈떎. " +
                   $"{fileHint}???ㅼ젣濡??앹꽦/媛깆떊?섍퀬 file_read ?먮뒗 document_read濡?寃€利앺븳 洹쇨굅瑜??④릿 ??醫낅즺?섏꽭??";
        }

        return "[System:TerminalEvidenceGate] ?꾩옱 醫낅즺 ?묐떟?먮뒗 ?ㅽ뻾 寃곌낵 利앷굅媛€ 遺€議깊빀?덈떎. " +
               "理쒖냼 1媛??댁긽??吏꾪뻾 ?꾧뎄(?섏젙/?ㅽ뻾/?앹꽦)瑜??깃났?쒗궎怨? 洹?寃곌낵瑜?洹쇨굅濡?理쒖쥌 ?묐떟???ㅼ떆 ?묒꽦?섏꽭??";
    }

    private static string BuildRecentExecutionEvidencePrompt(TaskTypePolicy taskPolicy)
    {
        var taskHint = taskPolicy.TaskType switch
        {
            "bugfix" => "?ы쁽 寃쎈줈 湲곗??쇰줈 ?섏젙 吏€?먯씠 ?ㅼ젣濡??닿껐?먮뒗吏€ 寃€利앺븯?몄슂.",
            "feature" => "?좉퇋 ?숈옉 寃쎈줈???뺤긽/?ㅻ쪟 耳€?댁뒪瑜?理쒖냼 1媛??댁긽 ?뺤씤?섏꽭??",
            "refactor" => "湲곗〈 ?숈옉 蹂댁〈 ?щ?瑜??뚭? 愿€?먯쑝濡??뺤씤?섏꽭??",
            _ => "?섏젙 ?곹뼢 踰붿쐞瑜?湲곗??쇰줈 ?ㅽ뻾 寃€利앹쓣 吏꾪뻾?섏꽭??"
        };

        return "[System:RecentExecutionGate] 留덉?留?肄붾뱶 ?섏젙 ?댄썑 build/test ?ㅽ뻾 洹쇨굅媛€ ?놁뒿?덈떎. " +
               "吏€湲?利됱떆 build_run ?먮뒗 test_loop瑜??몄텧??理쒖떊 ?곹깭瑜?寃€利앺븯怨?寃곌낵瑜??④린?몄슂. " +
               taskHint;
    }

    private static string BuildExecutionSuccessGatePrompt(TaskTypePolicy taskPolicy)
    {
        var taskHint = taskPolicy.TaskType switch
        {
            "bugfix" => "?ㅽ뙣 ?먯씤??癒쇱? ?섏젙?????숈씪 ?ы쁽 寃쎈줈 湲곗??쇰줈 ?뚯뒪?몃? ?ㅼ떆 ?듦낵?쒗궎?몄슂.",
            "feature" => "?듭떖 ?좉퇋 ?숈옉 寃쎈줈瑜??ы븿??build/test瑜??듦낵?쒗궎?몄슂.",
            "refactor" => "?뚭? ?щ?瑜??뺤씤?????덈뒗 ?뚯뒪?몃? ?듦낵?쒗궎?몄슂.",
            _ => "?섏젙 ?곹뼢 踰붿쐞瑜??뺤씤?????덈뒗 ?ㅽ뻾 寃€利앹쓣 ?듦낵?쒗궎?몄슂."
        };

        return "[System:ExecutionSuccessGate] ?꾩옱 ?ㅽ뻾 洹쇨굅媛€ ?ㅽ뙣 寃곌낵肉먯엯?덈떎. " +
               "醫낅즺?섏? 留먭퀬 build_run ?먮뒗 test_loop瑜??몄텧???깃났 寃곌낵瑜??뺣낫?섏꽭?? " +
               taskHint;
    }

    private static bool HasDiffEvidenceAfterLastModification(List<ChatMessage> messages)
    {
        var modificationTools = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
        {
            "file_edit", "file_write", "file_manage", "html_create", "markdown_create", "docx_create", "excel_create",
            "csv_create", "pptx_create", "chart_create", "document_assemble", "document_plan"
        };

        var sawDiff = false;
        foreach (var message in messages.AsEnumerable().Reverse())
        {
            if (!TryGetToolResultInfo(message, out var toolName, out var content))
                continue;

            if (string.Equals(toolName, "git_tool", StringComparison.OrdinalIgnoreCase))
            {
                sawDiff = IsLikelyDiffEvidenceContent(content);
                continue;
            }

            if (modificationTools.Contains(toolName))
                return sawDiff;
        }

        // 蹂€寃??꾧뎄 ?먯껜媛€ ?놁쑝硫?diff 寃뚯씠?몃? ?붽뎄?섏? ?딆쓬
        return true;
    }

    private static bool IsLikelyDiffEvidenceContent(string? content)
    {
        if (string.IsNullOrWhiteSpace(content))
            return false;

        return ContainsAny(
            content,
            "diff --git",
            "@@ ",
            "+++ ",
            "--- ",
            "changed files",
            "insertions",
            "deletions",
            "file changed",
            "異붽?",
            "??젣");
    }

    private bool TryApplyDocumentArtifactGateTransition(
        List<ChatMessage> messages,
        string? textResponse,
        TaskTypePolicy taskPolicy,
        string? lastArtifactFilePath,
        string? suggestedPath,
        RunState runState)
    {
        if (!ShouldRequestDocumentArtifact(taskPolicy.TaskType, lastArtifactFilePath, runState.DocumentArtifactGateRetry))
            return false;

        runState.DocumentArtifactGateRetry++;
        if (!string.IsNullOrEmpty(textResponse))
            messages.Add(new ChatMessage { Role = "assistant", Content = textResponse });

        var targetHint = string.IsNullOrWhiteSpace(suggestedPath) ? "?붿껌???곗텧臾?臾몄꽌 ?뚯씪" : $"'{suggestedPath}'";
        messages.Add(new ChatMessage
        {
            Role = "user",
            Content = "[System:DocumentArtifactGate] 寃곌낵 ?ㅻ챸留뚯쑝濡?醫낅즺?????놁뒿?덈떎. " +
                      $"吏€湲?利됱떆 {targetHint}???ㅼ젣 ?뚯씪濡??앹꽦?섏꽭?? " +
                      "html_create/markdown_create/document_assemble/file_write 以??곸젅???꾧뎄瑜?諛섎뱶???몄텧?섏꽭??"
        });
        EmitEvent(
            AgentEventType.Thinking,
            "",
            $"臾몄꽌 ?묒뾽 ?곗텧臾??뚯씪???놁뼱 ?꾧뎄 ?ㅽ뻾???ъ슂泥?빀?덈떎 ({runState.DocumentArtifactGateRetry}/2)");
        return true;
    }

    private bool TryApplyDocumentVerificationGateTransition(
        List<ChatMessage> messages,
        string? textResponse,
        TaskTypePolicy taskPolicy,
        string? lastArtifactFilePath,
        RunState runState)
    {
        if (!ShouldRequestDocumentVerification(taskPolicy.TaskType, lastArtifactFilePath, messages, runState.DocumentVerificationGateRetry))
            return false;

        runState.DocumentVerificationGateRetry++;
        if (!string.IsNullOrEmpty(textResponse))
            messages.Add(new ChatMessage { Role = "assistant", Content = textResponse });
        messages.Add(new ChatMessage
        {
            Role = "user",
            Content = "[System:DocumentVerificationGate] 臾몄꽌 ?뚯씪?€ ?앹꽦?섏뿀吏€留?寃€利?洹쇨굅媛€ 遺€議깊빀?덈떎. " +
                      "file_read ?먮뒗 document_read濡?諛⑷툑 ?앹꽦???뚯씪???ㅼ떆 ?쎄퀬, 臾몄젣 ?놁쓬/?섏젙 ?꾩슂瑜?紐낆떆??蹂닿퀬?섏꽭??"
        });
        EmitEvent(
            AgentEventType.Thinking,
            "",
            $"臾몄꽌 寃€利?洹쇨굅媛€ 遺€議깊빐 ?ш?利앹쓣 ?붿껌?⑸땲??({runState.DocumentVerificationGateRetry}/1)");
        return true;
    }

    private static bool ShouldRequestDocumentArtifact(
        string taskType,
        string? lastArtifactFilePath,
        int artifactGateRetry)
    {
        return string.Equals(taskType, "docs", StringComparison.OrdinalIgnoreCase)
               && !HasMaterializedArtifact(lastArtifactFilePath)
               && artifactGateRetry < 2;
    }

    private static bool ShouldRequestDocumentVerification(
        string taskType,
        string? lastArtifactFilePath,
        List<ChatMessage> messages,
        int verificationGateRetry)
    {
        return string.Equals(taskType, "docs", StringComparison.OrdinalIgnoreCase)
               && HasMaterializedArtifact(lastArtifactFilePath)
               && !HasDocumentVerificationEvidenceAfterLastArtifact(messages)
               && verificationGateRetry < 1;
    }

    private static bool HasDocumentVerificationEvidenceAfterLastArtifact(List<ChatMessage> messages)
    {
        var artifactTools = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
        {
            "html_create", "markdown_create", "docx_create", "excel_create", "csv_create", "pptx_create",
            "chart_create", "document_assemble", "file_write"
        };
        var verificationTools = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
        {
            "file_read", "document_read", "document_review"
        };

        var sawVerification = false;
        foreach (var message in messages.AsEnumerable().Reverse())
        {
            if (!TryGetToolResultToolName(message, out var toolName))
                continue;

            if (verificationTools.Contains(toolName))
            {
                sawVerification = true;
                continue;
            }

            if (artifactTools.Contains(toolName))
                return sawVerification;
        }

        return sawVerification;
    }

    private static bool HasMaterializedArtifact(string? path)
    {
        if (string.IsNullOrWhiteSpace(path))
            return false;

        try
        {
            return System.IO.File.Exists(path);
        }
        catch
        {
            return false;
        }
    }

    private static bool IsContextOverflowError(string? message)
    {
        if (string.IsNullOrWhiteSpace(message))
            return false;

        var lower = message.ToLowerInvariant();
        return lower.Contains("prompt too long")
               || lower.Contains("prompt is too long")
               || lower.Contains("context length")
               || lower.Contains("context window")
               || lower.Contains("too many tokens")
               || lower.Contains("max tokens")
               || lower.Contains("max_output_tokens")
               || lower.Contains("maximum output tokens")
               || lower.Contains("token limit")
               || lower.Contains("input is too long")
               || lower.Contains("response was truncated")
               || lower.Contains("maximum context");
    }

    private static bool IsLikelyWithheldOrOverflowResponse(string response)
    {
        var lower = response.ToLowerInvariant();
        return lower.Contains("withheld")
               || lower.Contains("prompt too long")
               || lower.Contains("context window")
               || lower.Contains("max_output_tokens")
               || lower.Contains("maximum output tokens")
               || lower.Contains("token limit")
               || lower.Contains("response was truncated")
               || lower.Contains("input is too long");
    }

    private static bool ForceContextRecovery(List<ChatMessage> messages)
    {
        if (messages.Count < 10)
            return false;

        var system = messages.FirstOrDefault(m => string.Equals(m.Role, "system", StringComparison.OrdinalIgnoreCase));
        var nonSystem = messages.Where(m => !string.Equals(m.Role, "system", StringComparison.OrdinalIgnoreCase)).ToList();
        if (nonSystem.Count < 8)
            return false;

        const int keepTailCount = 8;
        var removed = nonSystem.Take(Math.Max(0, nonSystem.Count - keepTailCount)).ToList();
        if (removed.Count < 3)
            return false;

        var summaryLines = removed
            .Where(m => !string.IsNullOrWhiteSpace(m.Content))
            .Take(14)
            .Select(m =>
            {
                var content = m.Content ?? "";
                if (content.StartsWith("{\"_tool_use_blocks\""))
                    content = "[?꾧뎄 ?몄텧 ?붿빟]";
                else if (content.StartsWith("{\"type\":\"tool_result\""))
                    content = "[?꾧뎄 ?ㅽ뻾 寃곌낵 ?붿빟]";
                else if (content.Length > 180)
                    content = content[..180] + "...";
                return $"- [{m.Role}] {content}";
            })
            .ToList();

        var summary = summaryLines.Count > 0
            ? string.Join("\n", summaryLines)
            : "- ?댁쟾 ?€??留λ씫???먮룞 異뺤빟?섏뿀?듬땲??";

        var tail = nonSystem.Skip(Math.Max(0, nonSystem.Count - keepTailCount)).ToList();

        messages.Clear();
        if (system != null)
            messages.Add(system);
        messages.Add(new ChatMessage
        {
            Role = "user",
            Timestamp = DateTime.Now,
            Content = $"[?쒖뒪???먮룞 留λ씫 異뺤빟]\n?꾨옒???댁쟾 ?€?붿쓽 ?듭떖 ?붿빟?낅땲??\n{summary}"
        });
        messages.AddRange(tail);
        return true;
    }

    private bool TryHandleRepeatedFailureGuardTransition(
        LlmService.ContentBlock call,
        string toolCallSignature,
        List<ChatMessage> messages,
        string? lastFailedToolSignature,
        int repeatedFailedToolSignatureCount,
        int maxRetry,
        string? lastModifiedCodeFilePath,
        bool requireHighImpactCodeVerification,
        TaskTypePolicy taskPolicy)
    {
        if (!ShouldBlockRepeatedFailedCall(
                toolCallSignature,
                lastFailedToolSignature,
                repeatedFailedToolSignatureCount,
                maxRetry))
            return false;

        var repeatedGuardMsg = BuildRepeatedFailureGuardMessage(
            call.ToolName,
            repeatedFailedToolSignatureCount,
            maxRetry);
        messages.Add(LlmService.CreateToolResultMessage(
            call.ToolId,
            call.ToolName,
            repeatedGuardMsg));
        messages.Add(new ChatMessage
        {
            Role = "user",
            Content = BuildRepeatedFailureRecoveryPrompt(
                call.ToolName,
                lastModifiedCodeFilePath,
                requireHighImpactCodeVerification,
                taskPolicy)
        });
        EmitEvent(
            AgentEventType.Thinking,
            call.ToolName,
            $"?숈씪 ?꾧뎄/?뚮씪誘명꽣 諛섎났 ?ㅽ뙣 ?⑦꽩 媛먯? - ?ㅻⅨ ?묎렐?쇰줈 ?꾪솚?⑸땲??({repeatedFailedToolSignatureCount}/{maxRetry})");
        return true;
    }

    private bool TryHandleNoProgressReadOnlyLoopTransition(
        LlmService.ContentBlock call,
        string toolCallSignature,
        int repeatedSameSignatureCount,
        List<ChatMessage> messages,
        string? lastModifiedCodeFilePath,
        bool requireHighImpactCodeVerification,
        TaskTypePolicy taskPolicy)
    {
        if (!ShouldBlockNoProgressReadOnlyLoop(
                call.ToolName,
                repeatedSameSignatureCount))
            return false;

        messages.Add(LlmService.CreateToolResultMessage(
            call.ToolId,
            call.ToolName,
            $"[NO_PROGRESS_LOOP_GUARD] ?숈씪???쎄린 ?꾧뎄 ?몄텧??{repeatedSameSignatureCount}??諛섎났?섏뿀?듬땲?? {toolCallSignature}\n" +
            "Stop repeating the same read-only call and switch to a concrete next action."));
        messages.Add(new ChatMessage
        {
            Role = "user",
            Content = BuildNoProgressLoopRecoveryPrompt(
                call.ToolName,
                lastModifiedCodeFilePath,
                requireHighImpactCodeVerification,
                taskPolicy)
        });
        EmitEvent(
            AgentEventType.Thinking,
            call.ToolName,
            $"臾댁쓽誘명븳 ?쎄린 ?꾧뎄 諛섎났 猷⑦봽瑜?媛먯????ㅻⅨ ?꾨왂?쇰줈 ?꾪솚?⑸땲??({repeatedSameSignatureCount}??");
        return true;
    }

    private bool TryHandleReadOnlyStagnationTransition(
        int consecutiveReadOnlySuccessTools,
        List<ChatMessage> messages,
        string? lastModifiedCodeFilePath,
        bool requireHighImpactCodeVerification,
        TaskTypePolicy taskPolicy)
    {
        var threshold = GetReadOnlyStagnationThreshold();
        if (consecutiveReadOnlySuccessTools < threshold)
            return false;

        messages.Add(new ChatMessage
        {
            Role = "user",
            Content = BuildNoProgressLoopRecoveryPrompt(
                "read_only_loop",
                lastModifiedCodeFilePath,
                requireHighImpactCodeVerification,
                taskPolicy)
        });
        EmitEvent(
            AgentEventType.Thinking,
            "",
            $"?쎄린 ?꾩슜 ?꾧뎄留??곗냽 {consecutiveReadOnlySuccessTools}???ㅽ뻾?섏뼱 ?뺤껜瑜?媛먯??덉뒿?덈떎. ?ㅽ뻾 ?④퀎濡??꾪솚?⑸땲?? (threshold={threshold})");
        return true;
    }

    private bool TryHandleNoProgressExecutionTransition(
        int consecutiveNonMutatingSuccessTools,
        List<ChatMessage> messages,
        string? lastModifiedCodeFilePath,
        bool requireHighImpactCodeVerification,
        TaskTypePolicy taskPolicy,
        string? documentPlanPath,
        RunState runState)
    {
        if (!ShouldTriggerNoProgressExecutionRecovery(
                consecutiveNonMutatingSuccessTools,
                runState.NoProgressRecoveryRetry))
            return false;

        runState.NoProgressRecoveryRetry++;
        var latestFailure = TryGetLatestFailureSignal(messages);
        messages.Add(new ChatMessage
        {
            Role = "user",
            Content = BuildNoProgressExecutionRecoveryPrompt(
                taskPolicy,
                lastModifiedCodeFilePath,
                requireHighImpactCodeVerification,
                documentPlanPath,
                latestFailure.ToolName,
                latestFailure.Output)
        });
        EmitEvent(
            AgentEventType.Thinking,
            "",
            $"?ㅽ뻾 吏꾩쟾???놁뼱 媛뺤젣 蹂듦뎄 ?④퀎瑜??쒖옉?⑸땲??({runState.NoProgressRecoveryRetry}/2)");
        return true;
    }

    private static bool ShouldTriggerNoProgressExecutionRecovery(
        int consecutiveNonMutatingSuccessTools,
        int recoveryRetryCount)
        => consecutiveNonMutatingSuccessTools >= GetNoProgressRecoveryThreshold()
           && recoveryRetryCount < GetNoProgressRecoveryMaxRetries();

    private static bool ShouldAbortNoProgressExecution(
        int consecutiveNonMutatingSuccessTools,
        int recoveryRetryCount)
        => consecutiveNonMutatingSuccessTools >= GetNoProgressAbortThreshold()
           && recoveryRetryCount >= GetNoProgressRecoveryMaxRetries();

    private static string BuildNoProgressExecutionRecoveryPrompt(
        TaskTypePolicy taskPolicy,
        string? lastModifiedCodeFilePath,
        bool highImpactChange,
        string? documentPlanPath,
        string? recentFailureToolName,
        string? recentFailureOutput)
    {
        if (string.Equals(taskPolicy.TaskType, "docs", StringComparison.OrdinalIgnoreCase))
        {
            var fileHint = string.IsNullOrWhiteSpace(documentPlanPath) ? "寃곌낵 臾몄꽌 ?뚯씪" : $"'{documentPlanPath}'";
            return "[System:NoProgressExecutionRecovery] ?쎄린/遺꾩꽍留?諛섎났?섍퀬 ?덉뒿?덈떎. " +
                   $"?댁젣 ?ㅻ챸??硫덉텛怨?{fileHint}???ㅼ젣濡??앹꽦?섎뒗 ?꾧뎄(html_create/markdown_create/document_assemble/file_write)瑜?利됱떆 ?몄텧?섏꽭??";
        }

        return BuildFailureNextToolPriorityPrompt(
            string.IsNullOrWhiteSpace(recentFailureToolName) ? "stagnation_guard" : recentFailureToolName!,
            lastModifiedCodeFilePath,
            highImpactChange,
            taskPolicy,
            recentFailureOutput);
    }

    private static (string? ToolName, string? Output) TryGetLatestFailureSignal(List<ChatMessage> messages)
    {
        foreach (var message in messages.AsEnumerable().Reverse())
        {
            if (!TryGetToolResultInfo(message, out var toolName, out var content))
                continue;

            if (IsLikelyFailureContent(content))
                return (toolName, content);
        }

        return (null, null);
    }

    private static bool IsLikelyFailureContent(string? content)
    {
        if (string.IsNullOrWhiteSpace(content))
            return false;

        var lower = content.ToLowerInvariant();
        if (ContainsAny(lower, "success", "succeeded", "passed", "?듦낵", "?깃났", "鍮뚮뱶?덉뒿?덈떎", "tests passed", "build succeeded")
            && !ContainsAny(lower, "fail", "failed", "error", "?ㅻ쪟", "?ㅽ뙣", "exception", "denied", "not found"))
            return false;

        return ContainsAny(
            lower,
            "fail",
            "failed",
            "error",
            "exception",
            "timeout",
            "timed out",
            "denied",
            "forbidden",
            "not found",
            "invalid",
            "?ㅽ뙣",
            "?ㅻ쪟",
            "?덉쇅",
            "?쒓컙 珥덇낵",
            "沅뚰븳",
            "李⑤떒",
            "찾을 수");
    }

    private static int UpdateConsecutiveReadOnlySuccessTools(
        int current,
        string toolName,
        bool success)
    {
        if (!success)
            return 0;

        return ReadOnlyTools.Contains(toolName ?? "")
            ? current + 1
            : 0;
    }

    private static int UpdateConsecutiveNonMutatingSuccessTools(
        int current,
        string toolName,
        bool success)
    {
        if (!success)
            return 0;

        return IsMutatingOrExecutionProgressTool(toolName)
            ? 0
            : current + 1;
    }

    private static bool IsMutatingOrExecutionProgressTool(string toolName)
    {
        return toolName is
            "file_write" or "file_edit" or "file_manage" or
            "html_create" or "markdown_create" or "docx_create" or "excel_create" or "csv_create" or "pptx_create" or "chart_create" or
            "document_assemble" or "document_plan" or
            "build_run" or "test_loop" or "process" or
            "git_tool";
    }

    private static bool ShouldBlockNoProgressReadOnlyLoop(
        string toolName,
        int repeatedSameSignatureCount)
    {
        if (repeatedSameSignatureCount < GetReadOnlySignatureLoopThreshold())
            return false;

        return ReadOnlyTools.Contains(toolName ?? "");
    }

    private static int GetReadOnlySignatureLoopThreshold()
    {
        return ResolveConfiguredOrEnvThresholdValue(
            GetConfiguredThresholdFromSettings(llm => llm.ReadOnlySignatureLoopThreshold, 2, 12),
            Environment.GetEnvironmentVariable("AXCOPILOT_READONLY_SIGNATURE_LOOP_THRESHOLD"),
            4,
            2,
            12);
    }

    private static int GetReadOnlyStagnationThreshold()
    {
        return ResolveConfiguredOrEnvThresholdValue(
            GetConfiguredThresholdFromSettings(llm => llm.ReadOnlyStagnationThreshold, 3, 20),
            Environment.GetEnvironmentVariable("AXCOPILOT_READONLY_STAGNATION_THRESHOLD"),
            6,
            3,
            20);
    }

    private static int GetNoProgressRecoveryThreshold()
    {
        return ResolveConfiguredOrEnvThresholdValue(
            GetConfiguredThresholdFromSettings(llm => llm.NoProgressRecoveryThreshold, 4, 30),
            Environment.GetEnvironmentVariable("AXCOPILOT_NOPROGRESS_RECOVERY_THRESHOLD"),
            8,
            4,
            30);
    }

    private static int GetNoProgressAbortThreshold()
    {
        return ResolveConfiguredOrEnvThresholdValue(
            GetConfiguredThresholdFromSettings(llm => llm.NoProgressAbortThreshold, 6, 50),
            Environment.GetEnvironmentVariable("AXCOPILOT_NOPROGRESS_ABORT_THRESHOLD"),
            12,
            6,
            50);
    }

    private static int GetNoProgressRecoveryMaxRetries()
    {
        return ResolveConfiguredOrEnvThresholdValue(
            GetConfiguredThresholdFromSettings(llm => llm.NoProgressRecoveryMaxRetries, 1, 5),
            Environment.GetEnvironmentVariable("AXCOPILOT_NOPROGRESS_RECOVERY_MAX_RETRIES"),
            2,
            1,
            5);
    }

    private static int ResolveConfiguredOrEnvThresholdValue(
        int? configured,
        string? envRaw,
        int defaultValue,
        int min,
        int max)
    {
        if (configured.HasValue)
            return configured.Value;

        return ResolveThresholdValue(envRaw, defaultValue, min, max);
    }

    private static int ResolveThresholdValue(string? raw, int defaultValue, int min, int max)
    {
        if (!int.TryParse(raw, out var value))
            return defaultValue;
        return Math.Clamp(value, min, max);
    }

    private static int? GetConfiguredThresholdFromSettings(Func<LlmSettings, int> selector, int min, int max)
    {
        try
        {
            var app = System.Windows.Application.Current as App;
            var llm = app?.SettingsService?.Settings?.Llm;
            if (llm == null)
                return null;

            var configured = selector(llm);
            if (configured <= 0)
                return null;

            return Math.Clamp(configured, min, max);
        }
        catch
        {
            return null;
        }
    }

    private static string BuildNoProgressLoopRecoveryPrompt(
        string toolName,
        string? lastModifiedCodeFilePath,
        bool highImpactChange,
        TaskTypePolicy taskPolicy)
    {
        if (string.Equals(taskPolicy.TaskType, "docs", StringComparison.OrdinalIgnoreCase))
        {
            return "[System:NoProgressRecovery] ?숈씪???쎄린 ?몄텧??諛섎났?섏뿀?듬땲?? " +
                   "?댁젣 臾몄꽌 ?앹꽦/?섏젙 ?꾧뎄(html_create/markdown_create/document_assemble/file_write) 以??섎굹瑜??ㅼ젣濡??몄텧??吏꾪뻾?섏꽭?? " +
                   "?ㅻ챸留??섏? 留먭퀬 利됱떆 ?꾧뎄瑜??몄텧?섏꽭??";
        }

        return BuildFailureNextToolPriorityPrompt(
            toolName,
            lastModifiedCodeFilePath,
            highImpactChange,
            taskPolicy);
    }

    private async Task<bool> TryHandleTransientLlmErrorTransitionAsync(
        Exception ex,
        RunState runState,
        CancellationToken ct)
    {
        if (!IsTransientLlmError(ex) || runState.TransientLlmErrorRetries >= 3)
            return false;

        runState.TransientLlmErrorRetries++;
        var delayMs = ComputeTransientLlmBackoffDelayMs(runState.TransientLlmErrorRetries, ex);
        EmitEvent(
            AgentEventType.Thinking,
            "",
            $"?쇱떆??LLM ?ㅻ쪟濡??ъ떆?꾪빀?덈떎 ({runState.TransientLlmErrorRetries}/3, {delayMs}ms ?€湲?");
        await Task.Delay(delayMs, ct);
        return true;
    }

    private static bool IsTransientLlmError(Exception ex)
    {
        var message = ex.Message ?? "";
        var lower = message.ToLowerInvariant();

        if (ex is TaskCanceledException or TimeoutException or System.Net.Http.HttpRequestException)
            return true;

        return lower.Contains("429")
               || lower.Contains("rate limit")
               || lower.Contains("too many requests")
               || lower.Contains("timeout")
               || lower.Contains("timed out")
               || lower.Contains("temporarily unavailable")
               || lower.Contains("service unavailable")
               || lower.Contains("503")
               || lower.Contains("502")
               || lower.Contains("bad gateway")
               || lower.Contains("gateway timeout")
               || lower.Contains("connection reset")
               || lower.Contains("overloaded")
               || lower.Contains("try again");
    }

    private static int ComputeTransientLlmBackoffDelayMs(int retryCount, Exception ex)
    {
        var message = ex.Message ?? "";
        var retryAfterMatch = System.Text.RegularExpressions.Regex.Match(
            message,
            @"retry[- ]?after\s*[:=]?\s*(\d+)",
            System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        if (retryAfterMatch.Success && int.TryParse(retryAfterMatch.Groups[1].Value, out var retryAfterSec))
            return Math.Clamp(retryAfterSec * 1000, 500, 15000);

        var exponential = retryCount switch
        {
            1 => 800,
            2 => 1600,
            _ => 3200
        };
        var jitter = Random.Shared.Next(0, 250);
        return exponential + jitter;
    }

    private static int GetToolExecutionTimeoutMs()
    {
        var fromSettings = 0;
        try
        {
            var app = System.Windows.Application.Current as App;
            fromSettings = app?.SettingsService?.Settings?.Llm?.ToolExecutionTimeoutMs ?? 0;
        }
        catch
        {
            fromSettings = 0;
        }

        return ResolveToolExecutionTimeoutMs(
            fromSettings,
            Environment.GetEnvironmentVariable("AXCOPILOT_TOOL_TIMEOUT_MS"));
    }

    private static int ResolveToolExecutionTimeoutMs(int configuredMs, string? envRaw)
    {
        if (configuredMs > 0)
            return Math.Clamp(configuredMs, 5000, 600000);

        if (int.TryParse(envRaw, out var parsed) && parsed > 0)
            return Math.Clamp(parsed, 5000, 600000);

        return 90000;
    }

    private async Task<ToolResult> ExecuteToolWithTimeoutAsync(
        IAgentTool tool,
        string toolName,
        JsonElement input,
        AgentContext context,
        List<ChatMessage>? messages,
        CancellationToken ct)
    {
        var timeoutMs = GetToolExecutionTimeoutMs();
        using var timeoutCts = CancellationTokenSource.CreateLinkedTokenSource(ct);
        timeoutCts.CancelAfter(timeoutMs);

        try
        {
            return await EnforceToolPermissionAsync(toolName, input, context, messages)
                   ?? await tool.ExecuteAsync(input, context, timeoutCts.Token);
        }
        catch (OperationCanceledException) when (!ct.IsCancellationRequested)
        {
            return ToolResult.Fail($"?꾧뎄 ?ㅽ뻾 ?€?꾩븘??({timeoutMs}ms): {toolName}");
        }
    }

    private async Task<List<LlmService.ContentBlock>> SendWithToolsWithRecoveryAsync(
        List<ChatMessage> messages,
        IReadOnlyCollection<IAgentTool> tools,
        CancellationToken ct,
        string phaseLabel,
        RunState? runState = null)
    {
        var transientRetries = runState?.TransientLlmErrorRetries ?? 0;
        var contextRecoveryRetries = runState?.ContextRecoveryAttempts ?? 0;
        while (true)
        {
            try
            {
                return await _llm.SendWithToolsAsync(messages, tools, ct);
            }
            catch (Exception ex)
            {
                if (IsContextOverflowError(ex.Message)
                    && contextRecoveryRetries < 2
                    && ForceContextRecovery(messages))
                {
                    contextRecoveryRetries++;
                    if (runState != null)
                        runState.ContextRecoveryAttempts = contextRecoveryRetries;
                    EmitEvent(
                        AgentEventType.Thinking,
                        "",
                        $"{phaseLabel}: 而⑦뀓?ㅽ듃 珥덇낵瑜?媛먯???蹂듦뎄 ???ъ떆?꾪빀?덈떎 ({contextRecoveryRetries}/2)");
                    continue;
                }

                if (IsTransientLlmError(ex) && transientRetries < 3)
                {
                    transientRetries++;
                    if (runState != null)
                        runState.TransientLlmErrorRetries = transientRetries;
                    var delayMs = ComputeTransientLlmBackoffDelayMs(transientRetries, ex);
                    EmitEvent(
                        AgentEventType.Thinking,
                        "",
                        $"{phaseLabel}: ?쇱떆??LLM ?ㅻ쪟濡??ъ떆?꾪빀?덈떎 ({transientRetries}/3, {delayMs}ms ?€湲?");
                    await Task.Delay(delayMs, ct);
                    continue;
                }

                throw;
            }
        }
    }

    private void ApplyToolPostExecutionBookkeeping(
        LlmService.ContentBlock call,
        ToolResult result,
        TokenUsage? tokenUsage,
        Models.LlmSettings llm,
        int baseMax,
        List<string> statsUsedTools,
        ref int totalToolCalls,
        ref int maxIterations,
        ref int statsSuccessCount,
        ref int statsFailCount,
        ref int statsInputTokens,
        ref int statsOutputTokens)
    {
        if (result.Success) statsSuccessCount++; else statsFailCount++;
        statsInputTokens += tokenUsage?.PromptTokens ?? 0;
        statsOutputTokens += tokenUsage?.CompletionTokens ?? 0;
        if (!statsUsedTools.Contains(call.ToolName))
            statsUsedTools.Add(call.ToolName);

        if (llm.EnableAuditLog)
        {
            AuditLogService.LogToolCall(
                _conversationId, ActiveTab ?? "",
                call.ToolName,
                call.ToolInput.ToString() ?? "",
                TruncateOutput(result.Output, 500),
                result.FilePath, result.Success);
        }

        totalToolCalls++;
        if (totalToolCalls > 15 && maxIterations < baseMax * 2)
            maxIterations = Math.Min(baseMax * 2, 50);

        if (call.ToolName == "test_loop" && result.Output.Contains("[AUTO_FIX:"))
        {
            var testFixMax = llm.MaxTestFixIterations > 0 ? llm.MaxTestFixIterations : 5;
            var testFixBudget = baseMax + testFixMax * 3;
            if (maxIterations < testFixBudget)
                maxIterations = Math.Min(testFixBudget, 60);
        }
    }

    private bool TryHandleToolFailureTransition(
        LlmService.ContentBlock call,
        ToolResult result,
        AgentContext context,
        TaskTypePolicy taskPolicy,
        List<ChatMessage> messages,
        int maxRetry,
        string? lastModifiedCodeFilePath,
        bool requireHighImpactCodeVerification,
        string toolCallSignature,
        ref int consecutiveErrors,
        ref bool recoveryPendingAfterFailure,
        ref string? lastFailedToolSignature,
        ref int repeatedFailedToolSignatureCount)
    {
        if (result.Success)
            return false;

        var failureState = ComputeFailureTransitionState(
            toolCallSignature,
            lastFailedToolSignature,
            repeatedFailedToolSignatureCount,
            consecutiveErrors,
            maxRetry);
        lastFailedToolSignature = failureState.LastFailedToolSignature;
        repeatedFailedToolSignatureCount = failureState.RepeatedFailedToolSignatureCount;
        consecutiveErrors = failureState.ConsecutiveErrors;
        recoveryPendingAfterFailure = true;
        RememberFailurePattern(call.ToolName, result, context, taskPolicy, lastModifiedCodeFilePath, consecutiveErrors, maxRetry);
        var nonRetriableFailure = IsNonRetriableToolFailure(result);
        if (failureState.CanRetry && !nonRetriableFailure)
        {
            var reflectionMsg = BuildFailureReflectionMessage(
                call.ToolName,
                result,
                consecutiveErrors,
                maxRetry,
                taskPolicy);
            messages.Add(LlmService.CreateToolResultMessage(
                call.ToolId, call.ToolName, reflectionMsg));
            if (string.Equals(ActiveTab, "Code", StringComparison.OrdinalIgnoreCase)
                && call.ToolName is "build_run" or "test_loop")
            {
                messages.Add(new ChatMessage
                {
                    Role = "user",
                    Content = BuildFailureInvestigationPrompt(
                        call.ToolName,
                        lastModifiedCodeFilePath,
                        requireHighImpactCodeVerification,
                        taskPolicy,
                        result.Output)
                });
            }
            if (string.Equals(ActiveTab, "Code", StringComparison.OrdinalIgnoreCase))
            {
                messages.Add(new ChatMessage
                {
                    Role = "user",
                    Content = BuildFailureNextToolPriorityPrompt(
                        call.ToolName,
                        lastModifiedCodeFilePath,
                        requireHighImpactCodeVerification,
                        taskPolicy,
                        result.Output)
                });
            }
            EmitEvent(AgentEventType.Thinking, "", $"Self-Reflection: ?ㅽ뙣 遺꾩꽍 ???ъ떆??({consecutiveErrors}/{maxRetry})");
            return true;
        }

        if (nonRetriableFailure)
        {
            messages.Add(LlmService.CreateToolResultMessage(
                call.ToolId, call.ToolName,
                $"[NON_RETRIABLE_FAILURE] {TruncateOutput(result.Output, 500)}\n" +
                "Retrying the same tool call is unlikely to succeed. Switch to a different tool or approach and explain next action."));
            if (string.Equals(ActiveTab, "Code", StringComparison.OrdinalIgnoreCase))
            {
                messages.Add(new ChatMessage
                {
                    Role = "user",
                    Content = BuildFailureNextToolPriorityPrompt(
                        call.ToolName,
                        lastModifiedCodeFilePath,
                        requireHighImpactCodeVerification,
                        taskPolicy,
                        result.Output)
                });
            }
            EmitEvent(AgentEventType.Thinking, "", "鍮꾩옱?쒕룄 ?ㅽ뙣濡?遺꾨쪟?섏뼱 ?숈씪 ?몄텧 諛섎났??以묐떒?섍퀬 ?고쉶 ?꾨왂?쇰줈 ?꾪솚?⑸땲??");
            return true;
        }

        messages.Add(LlmService.CreateToolResultMessage(
            call.ToolId, call.ToolName,
            $"[FAILED after {maxRetry} retries] {TruncateOutput(result.Output, 500)}\n" +
            "Stop retrying this tool. Explain the error to the user and suggest alternative approaches."));

        try
        {
            var app = System.Windows.Application.Current as App;
            var memSvc = app?.MemoryService;
            if (memSvc != null && (app?.SettingsService?.Settings.Llm.EnableAgentMemory ?? false))
            {
                memSvc.Add("correction",
                    $"?꾧뎄 '{call.ToolName}' 諛섎났 ?ㅽ뙣: {TruncateOutput(result.Output, 200)}",
                    $"conv:{_conversationId}", context.WorkFolder);
            }
        }
        catch { }

        return true;
    }

    private static bool IsNonRetriableToolFailure(ToolResult result)
    {
        if (result.Success)
            return false;

        var output = result.Output ?? "";
        var lower = output.ToLowerInvariant();
        return lower.Contains("알 수 없는 도구")
               || lower.Contains("unknown tool")
               || lower.Contains("permission denied")
               || lower.Contains("권한")
               || lower.Contains("forbidden")
               || lower.Contains("unauthorized")
               || lower.Contains("invalid argument")
               || lower.Contains("잘못된 인자")
               || lower.Contains("schema validation")
               || lower.Contains("json parse");
    }

    private void ApplyDocumentPlanSuccessTransitions(
        LlmService.ContentBlock call,
        ToolResult result,
        List<ChatMessage> messages,
        ref bool documentPlanCalled,
        ref string? documentPlanPath,
        ref string? documentPlanTitle,
        ref string? documentPlanScaffold)
    {
        if (!string.Equals(call.ToolName, "document_plan", StringComparison.OrdinalIgnoreCase))
            return;

        documentPlanCalled = true;
        var po = result.Output ?? string.Empty;
        var pm = System.Text.RegularExpressions.Regex.Match(po, @"path:\s*""([^""]+)""");
        if (pm.Success) documentPlanPath = pm.Groups[1].Value;
        var tm = System.Text.RegularExpressions.Regex.Match(po, @"title:\s*""([^""]+)""");
        if (tm.Success) documentPlanTitle = tm.Groups[1].Value;
        documentPlanScaffold = ExtractDocumentPlanScaffold(po);

        if (!ContainsDocumentPlanFollowUpInstruction(po))
            return;

        var toolHint = ResolveDocumentPlanFollowUpTool(po);
        messages.Add(new ChatMessage
        {
            Role = "user",
            Content =
                "document_plan이 완료되었습니다. " +
                "방금 생성된 골격의 [내용...] 자리와 각 섹션 내용을 실제 상세 본문으로 모두 채운 뒤 " +
                $"{toolHint} 도구를 지금 즉시 호출하세요. " +
                "설명만 하지 말고 실제 문서 생성 도구 호출로 바로 이어가세요."
        });
        EmitEvent(AgentEventType.Thinking, "", $"문서 개요 완료 · {toolHint} 실행 유도");
    }

    private static string? ExtractDocumentPlanScaffold(string output)
    {
        if (string.IsNullOrWhiteSpace(output))
            return null;

        var markers = new (string Start, string End)[]
        {
            ("--- body 시작 ---", "--- body 끝 ---"),
            ("--- body start ---", "--- body end ---"),
            ("<!-- body start marker -->", "<!-- body end marker -->"),
        };

        foreach (var (startMarker, endMarker) in markers)
        {
            var start = output.IndexOf(startMarker, StringComparison.OrdinalIgnoreCase);
            if (start < 0)
                continue;

            var contentStart = start + startMarker.Length;
            var end = output.IndexOf(endMarker, contentStart, StringComparison.OrdinalIgnoreCase);
            if (end <= contentStart)
                continue;

            var scaffold = output[contentStart..end].Trim();
            if (!string.IsNullOrWhiteSpace(scaffold))
                return scaffold;
        }

        return null;
    }

    private static bool ContainsDocumentPlanFollowUpInstruction(string output)
    {
        if (string.IsNullOrWhiteSpace(output))
            return false;

        return output.Contains("즉시 실행", StringComparison.OrdinalIgnoreCase)
               || output.Contains("immediate next step", StringComparison.OrdinalIgnoreCase)
               || output.Contains("call html_create", StringComparison.OrdinalIgnoreCase)
               || output.Contains("call document_assemble", StringComparison.OrdinalIgnoreCase);
    }

    private static string ResolveDocumentPlanFollowUpTool(string output)
    {
        if (output.Contains("document_assemble", StringComparison.OrdinalIgnoreCase))
            return "document_assemble";
        if (output.Contains("docx_create", StringComparison.OrdinalIgnoreCase))
            return "docx_create";
        if (output.Contains("markdown_create", StringComparison.OrdinalIgnoreCase))
            return "markdown_create";
        if (output.Contains("file_write", StringComparison.OrdinalIgnoreCase))
            return "file_write";
        return "html_create";
    }

    private void ApplyCodeQualityFollowUpTransition(
        LlmService.ContentBlock call,
        ToolResult result,
        List<ChatMessage> messages,
        TaskTypePolicy taskPolicy,
        ref bool requireHighImpactCodeVerification,
        ref string? lastModifiedCodeFilePath)
    {
        var highImpactCodeChange = IsHighImpactCodeModification(ActiveTab ?? "", call.ToolName, result);
        if (ShouldInjectCodeQualityFollowUp(ActiveTab ?? "", call.ToolName, result))
        {
            requireHighImpactCodeVerification = highImpactCodeChange;
            lastModifiedCodeFilePath = result.FilePath;
            messages.Add(new ChatMessage
            {
                Role = "user",
                Content = BuildCodeQualityFollowUpPrompt(
                    call.ToolName,
                    result,
                    highImpactCodeChange,
                    HasAnyBuildOrTestEvidence(messages),
                    taskPolicy)
            });
            EmitEvent(AgentEventType.Thinking, "", highImpactCodeChange
                ? "怨좎쁺??肄붾뱶 蹂€寃쎌씠??李몄“ 寃€?됯낵 build/test 寃€利앹쓣 ???꾧꺽?섍쾶 ?댁뼱媛묐땲??.."
                : "肄붾뱶 蹂€寃???build/test/diff 寃€利앹쓣 ?댁뼱媛묐땲??..");
        }
        else if (HasCodeVerificationEvidenceAfterLastModification(messages, requireHighImpactCodeVerification))
        {
            requireHighImpactCodeVerification = false;
        }
    }

    private async Task<(bool Completed, bool ConsumedExtraIteration)> TryHandleTerminalDocumentCompletionTransitionAsync(
        LlmService.ContentBlock call,
        ToolResult result,
        List<LlmService.ContentBlock> toolCalls,
        List<ChatMessage> messages,
        Models.LlmSettings llm,
        AgentContext context,
        CancellationToken ct)
    {
        if (!result.Success || !IsTerminalDocumentTool(call.ToolName) || toolCalls.Count != 1)
            return (false, false);

        var verificationEnabled = AgentTabSettingsResolver.IsPostToolVerificationEnabled(ActiveTab, llm);
        var shouldVerify = ShouldRunPostToolVerification(
            ActiveTab,
            call.ToolName,
            result.Success,
            verificationEnabled,
            verificationEnabled);
        var consumedExtraIteration = false;
        if (shouldVerify)
        {
            await RunPostToolVerificationAsync(messages, call.ToolName, result, context, ct);
            consumedExtraIteration = true;
        }

        EmitEvent(AgentEventType.Complete, "", "?먯씠?꾪듃 ?묒뾽 ?꾨즺");
        return (true, consumedExtraIteration);
    }

    private async Task<bool> TryApplyPostToolVerificationTransitionAsync(
        LlmService.ContentBlock call,
        ToolResult result,
        List<ChatMessage> messages,
        Models.LlmSettings llm,
        AgentContext context,
        CancellationToken ct)
    {
        if (!result.Success)
            return false;

        var verificationEnabled = AgentTabSettingsResolver.IsPostToolVerificationEnabled(ActiveTab, llm);
        var shouldVerify = ShouldRunPostToolVerification(
            ActiveTab,
            call.ToolName,
            result.Success,
            verificationEnabled,
            verificationEnabled);
        if (!shouldVerify)
            return false;

        await RunPostToolVerificationAsync(messages, call.ToolName, result, context, ct);
        return true;
    }

    private async Task<(bool ShouldContinue, string? TerminalResponse)> TryHandleUserDecisionTransitionsAsync(
        LlmService.ContentBlock call,
        AgentContext context,
        List<ChatMessage> messages)
    {
        if (context.DevModeStepApproval && UserDecisionCallback != null)
        {
            var decision = await UserDecisionCallback(
                $"[DEV] ?꾧뎄 '{call.ToolName}' ?ㅽ뻾???뱀씤?섏떆寃좎뒿?덇퉴?\n{FormatToolCallSummary(call)}",
                new List<string> { "?뱀씤", "嫄대꼫?곌린", "以묐떒" });
            var (devShouldContinue, devTerminalResponse, devToolResultMessage) =
                EvaluateDevStepDecision(decision);
            if (!string.IsNullOrEmpty(devTerminalResponse))
            {
                EmitEvent(AgentEventType.Complete, "", "[DEV] ?ъ슜?먭? ?ㅽ뻾??以묐떒?덉뒿?덈떎");
                return (false, devTerminalResponse);
            }
            if (devShouldContinue)
            {
                messages.Add(LlmService.CreateToolResultMessage(
                    call.ToolId, call.ToolName, devToolResultMessage ?? "[SKIPPED by developer] ?ъ슜?먭? ???꾧뎄 ?ㅽ뻾??嫄대꼫?곗뿀?듬땲??"));
                return (true, null);
            }
        }

        var decisionRequired = CheckDecisionRequired(call, context);
        if (decisionRequired != null && UserDecisionCallback != null)
        {
            var decision = await UserDecisionCallback(
                decisionRequired,
                new List<string> { "?뱀씤", "嫄대꼫?곌린", "痍⑥냼" });
            var (scopeShouldContinue, scopeTerminalResponse, scopeToolResultMessage) =
                EvaluateScopeDecision(decision);
            if (!string.IsNullOrEmpty(scopeTerminalResponse))
            {
                EmitEvent(AgentEventType.Complete, "", "?ъ슜?먭? ?묒뾽??痍⑥냼?덉뒿?덈떎");
                return (false, scopeTerminalResponse);
            }
            if (scopeShouldContinue)
            {
                messages.Add(LlmService.CreateToolResultMessage(
                    call.ToolId, call.ToolName, scopeToolResultMessage ?? "[SKIPPED] ?ъ슜?먭? ???묒뾽??嫄대꼫?곗뿀?듬땲??"));
                return (true, null);
            }
        }

        return (false, null);
    }

    private sealed class RunState
    {
        public int ContextRecoveryAttempts;
        public int WithheldRecoveryAttempts;
        public int NoToolCallLoopRetry;
        public int CodeDiffGateRetry;
        public int RecentExecutionGateRetry;
        public int ExecutionSuccessGateRetry;
        public int HighImpactBuildTestGateRetry;
        public int CodeVerificationGateRetry;
        public int FinalReportGateRetry;
        public int TransientLlmErrorRetries;
        public int DocumentArtifactGateRetry;
        public int DocumentVerificationGateRetry;
        public int NoProgressRecoveryRetry;
        public int TerminalEvidenceGateRetry;
        public bool PendingPostCompactionTurn;
        public int PostCompactionTurnCounter;
        public string LastCompactionStageSummary = "";
        public int LastCompactionSavedTokens;
        public int PostCompactionToolResultCompactions;
    }
}