using AxCopilot.Models;

namespace AxCopilot.Services.Agent;

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

        // document_plan 없이 바로 문서 도구가 호출된 경우 — 아직 LLM이 추가 반복을 할 수 있음.
        // 한 번에 생성된 문서는 내용이 부실할 수 있으므로 조기 종료하지 않고 LLM에 판단을 맡긴다.
        if (!_docFallbackAttempted && !documentPlanWasCalled)
            return (false, false);

        var verificationEnabled = executionPolicy.EnablePostToolVerification
            && 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, "", "에이전트 작업 완료");
        return (true, consumedExtraIteration);
    }

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

        var verificationEnabled = executionPolicy.EnablePostToolVerification
            && 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;
    }
}