using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Media;
using AxCopilot.Models;
using AxCopilot.Services;

namespace AxCopilot.Views;

public partial class ChatWindow
{
    private Popup? _memoryStatusPopup;

    private string BuildDefaultInputWatermark()
    {
        var hasFolder = !string.IsNullOrWhiteSpace(GetCurrentWorkFolder());
        return _activeTab switch
        {
            "Cowork" => hasFolder
                ? "문서 작성, 데이터 분석, 파일 작업을 요청하세요. 필요하면 작업 폴더 파일도 함께 참고합니다."
                : "문서 작성, 데이터 분석, 파일 작업을 요청하세요. 작업 폴더를 선택하면 관련 파일도 함께 참고합니다.",
            "Code" => hasFolder
                ? "코드 수정, 원인 분석, 빌드와 테스트를 요청하세요. 작업 폴더 코드와 저장소 상태를 함께 참고합니다."
                : "작업 폴더를 선택한 뒤 코드 수정, 원인 분석, 빌드와 테스트를 요청하세요.",
            _ => "질문, 요약, 초안 작성, 아이디어 정리를 요청하세요.",
        };
    }

    private void RefreshInputWatermarkText()
    {
        if (InputWatermark == null)
            return;

        InputWatermark.Text = string.IsNullOrWhiteSpace(_promptCardPlaceholder)
            ? BuildDefaultInputWatermark()
            : _promptCardPlaceholder;
    }

    private string BuildSelectedPresetGuideDescription(TopicPreset preset)
    {
        if (!string.IsNullOrWhiteSpace(preset.Description))
            return preset.Description.Trim();

        if (string.Equals(_activeTab, "Cowork", StringComparison.OrdinalIgnoreCase))
            return "선택한 작업 유형에 맞춰 문서·데이터·파일 작업 흐름으로 이어집니다.";

        return "선택한 대화 주제에 맞춰 응답 방향과 초안 흐름을 정리합니다.";
    }

    private void UpdateFolderBar()
    {
        if (FolderBar == null)
            return;

        if (_activeTab == "Chat")
        {
            FolderBar.Visibility = Visibility.Collapsed;
            UpdateGitBranchUi(null, "", "", "", "", Visibility.Collapsed);
            RefreshContextUsageVisual();
            return;
        }

        FolderBar.Visibility = Visibility.Visible;
        var folder = GetCurrentWorkFolder();
        if (!string.IsNullOrEmpty(folder))
        {
            FolderPathLabel.Text = folder;
            FolderPathLabel.ToolTip = folder;
        }
        else
        {
            FolderPathLabel.Text = "폴더를 선택하세요";
            FolderPathLabel.ToolTip = null;
        }

        LoadConversationSettings();
        LoadCompactionMetricsFromConversation();
        UpdatePermissionUI();
        UpdateDataUsageUI();
        UpdateMemoryStatusUi();
        RefreshContextUsageVisual();
        ScheduleGitBranchRefresh();
        UpdateGitBranchUi(
            _currentGitBranchName,
            GitBranchFilesText?.Text ?? "",
            GitBranchAddedText?.Text ?? "",
            GitBranchDeletedText?.Text ?? "",
            _currentGitTooltip ?? "",
            BtnGitBranch?.Visibility ?? Visibility.Collapsed);
    }

    private void UpdateDataUsageUI()
    {
        _folderDataUsage = GetAutomaticFolderDataUsage();
    }

    private void UpdateMemoryStatusUi()
    {
        if (BtnMemoryStatus == null || MemoryStatusLabel == null)
            return;

        BtnMemoryStatus.Visibility = Visibility.Collapsed;
        MemoryStatusSeparator.Visibility = Visibility.Collapsed;
        MemoryStatusLabel.Text = "메모리 없음";
        BtnMemoryStatus.ToolTip = null;
    }

    private void BtnMemoryStatus_Click(object sender, RoutedEventArgs e)
    {
        if (BtnMemoryStatus == null)
            return;

        if (BtnMemoryStatus.Visibility != Visibility.Visible)
            return;

        _memoryStatusPopup?.SetCurrentValue(Popup.IsOpenProperty, false);

        var app = System.Windows.Application.Current as App;
        var memory = app?.MemoryService;
        if (memory == null)
            return;

        var workFolder = GetCurrentWorkFolder();
        memory.Load(workFolder);
        var docs = memory.InstructionDocuments;
        var learned = memory.All.Count;
        var includePolicy = _settings.Settings.Llm.AllowExternalMemoryIncludes ? "외부 include 허용" : "외부 include 차단";
        var auditEnabled = _settings.Settings.Llm.EnableAuditLog;
        var recentIncludeEntries = AuditLogService.LoadRecent("MemoryInclude", maxCount: 5, daysBack: 3);

        var primaryText = TryFindResource("PrimaryText") as Brush ?? Brushes.White;
        var secondaryText = TryFindResource("SecondaryText") as Brush ?? Brushes.Gray;
        var accentBrush = TryFindResource("AccentColor") as Brush ?? secondaryText;
        var okBrush = new SolidColorBrush(Color.FromRgb(0x22, 0x9A, 0x55));
        var warnBrush = new SolidColorBrush(Color.FromRgb(0xD9, 0x77, 0x06));
        var dangerBrush = new SolidColorBrush(Color.FromRgb(0xDC, 0x26, 0x26));

        var panel = new StackPanel { Margin = new Thickness(2) };
        panel.Children.Add(new TextBlock
        {
            Text = "메모리 상태",
            FontSize = 13,
            FontWeight = FontWeights.SemiBold,
            Foreground = primaryText,
            Margin = new Thickness(8, 4, 8, 2),
        });
        panel.Children.Add(new TextBlock
        {
            Text = $"계층형 규칙 {docs.Count}개 · 학습 메모리 {learned}개 · {includePolicy}",
            FontSize = 11.5,
            Foreground = secondaryText,
            TextWrapping = TextWrapping.Wrap,
            Margin = new Thickness(8, 0, 8, 6),
        });

        if (docs.Count > 0)
        {
            panel.Children.Add(CreateSurfacePopupSeparator());
            panel.Children.Add(new TextBlock
            {
                Text = "적용 중 규칙",
                FontSize = 12,
                FontWeight = FontWeights.SemiBold,
                Foreground = primaryText,
                Margin = new Thickness(8, 6, 8, 4),
            });

            foreach (var doc in docs.Take(6))
                panel.Children.Add(BuildMemoryPopupRuleRow(doc, primaryText, secondaryText, accentBrush));

            if (docs.Count > 6)
            {
                panel.Children.Add(new TextBlock
                {
                    Text = $"외 {docs.Count - 6}개 규칙",
                    FontSize = 11,
                    Foreground = secondaryText,
                    Margin = new Thickness(8, 2, 8, 4),
                });
            }
        }

        panel.Children.Add(CreateSurfacePopupSeparator());
        panel.Children.Add(new TextBlock
        {
            Text = "최근 include 감사",
            FontSize = 12,
            FontWeight = FontWeights.SemiBold,
            Foreground = primaryText,
            Margin = new Thickness(8, 6, 8, 4),
        });

        if (!auditEnabled)
        {
            panel.Children.Add(new TextBlock
            {
                Text = "감사 로그가 꺼져 있어 include 이력은 기록되지 않습니다.",
                FontSize = 11,
                Foreground = secondaryText,
                TextWrapping = TextWrapping.Wrap,
                Margin = new Thickness(8, 0, 8, 6),
            });
        }
        else if (recentIncludeEntries.Count == 0)
        {
            panel.Children.Add(new TextBlock
            {
                Text = "최근 3일간 include 감사 기록이 없습니다.",
                FontSize = 11,
                Foreground = secondaryText,
                Margin = new Thickness(8, 0, 8, 6),
            });
        }
        else
        {
            foreach (var entry in recentIncludeEntries)
                panel.Children.Add(BuildMemoryPopupAuditRow(entry, primaryText, secondaryText, okBrush, warnBrush, dangerBrush));
        }

        var container = CreateSurfacePopupContainer(panel, 340, new Thickness(8));
        _memoryStatusPopup = new Popup
        {
            Child = container,
            StaysOpen = false,
            AllowsTransparency = true,
            PopupAnimation = PopupAnimation.Fade,
            Placement = PlacementMode.Top,
            PlacementTarget = BtnMemoryStatus,
            VerticalOffset = -6,
        };
        _memoryStatusPopup.IsOpen = true;
    }

    private static string ShortenMemoryPath(string path)
    {
        try
        {
            var fileName = Path.GetFileName(path);
            if (string.IsNullOrWhiteSpace(fileName))
                return path;

            var directory = Path.GetDirectoryName(path);
            return string.IsNullOrWhiteSpace(directory) ? fileName : $"{fileName} · {directory}";
        }
        catch
        {
            return path;
        }
    }

    private Border BuildMemoryPopupRuleRow(MemoryInstructionDocument doc, Brush primaryText, Brush secondaryText, Brush accentBrush)
    {
        var meta = new List<string>();
        if (!string.IsNullOrWhiteSpace(doc.Description))
            meta.Add(doc.Description.Trim());
        if (doc.Tags.Count > 0)
            meta.Add($"tags: {string.Join(", ", doc.Tags)}");
        if (doc.Paths.Count > 0)
            meta.Add($"paths: {string.Join(", ", doc.Paths.Take(2))}{(doc.Paths.Count > 2 ? "..." : "")}");

        var stack = new StackPanel { Margin = new Thickness(8, 2, 8, 4) };
        stack.Children.Add(new TextBlock
        {
            Text = $"[{doc.Label}] 우선순위 {doc.Priority}",
            FontSize = 11.5,
            FontWeight = FontWeights.SemiBold,
            Foreground = primaryText,
        });
        stack.Children.Add(new TextBlock
        {
            Text = meta.Count == 0 ? doc.Layer : $"{doc.Layer} · {string.Join(" · ", meta)}",
            FontSize = 10.5,
            Foreground = secondaryText,
            TextWrapping = TextWrapping.Wrap,
            Margin = new Thickness(0, 2, 0, 0),
        });
        if (!string.IsNullOrWhiteSpace(doc.Path))
        {
            stack.Children.Add(new TextBlock
            {
                Text = ShortenMemoryPath(doc.Path),
                FontSize = 10.5,
                Foreground = accentBrush,
                TextWrapping = TextWrapping.Wrap,
                Margin = new Thickness(0, 2, 0, 0),
            });
        }

        return new Border { Background = Brushes.Transparent, CornerRadius = new CornerRadius(8), Child = stack };
    }

    private Border BuildMemoryPopupAuditRow(AuditEntry entry, Brush primaryText, Brush secondaryText, Brush okBrush, Brush warnBrush, Brush dangerBrush)
    {
        var statusBrush = entry.Success ? okBrush : dangerBrush;
        var statusText = entry.Success ? "허용" : "차단";
        var resultBrush = entry.Success ? secondaryText : warnBrush;

        var stack = new StackPanel { Margin = new Thickness(8, 2, 8, 4) };
        stack.Children.Add(new TextBlock
        {
            Text = $"{statusText} · {entry.Timestamp:HH:mm:ss}",
            FontSize = 11.5,
            FontWeight = FontWeights.SemiBold,
            Foreground = statusBrush,
        });
        stack.Children.Add(new TextBlock
        {
            Text = entry.Parameters,
            FontSize = 10.5,
            Foreground = primaryText,
            TextWrapping = TextWrapping.Wrap,
            Margin = new Thickness(0, 2, 0, 0),
        });
        stack.Children.Add(new TextBlock
        {
            Text = string.IsNullOrWhiteSpace(entry.Result) ? (entry.FilePath ?? "") : entry.Result,
            FontSize = 10.5,
            Foreground = resultBrush,
            TextWrapping = TextWrapping.Wrap,
            Margin = new Thickness(0, 2, 0, 0),
        });

        return new Border { Background = Brushes.Transparent, CornerRadius = new CornerRadius(8), Child = stack };
    }

    private string? BuildMemoryContextEvidenceText()
    {
        if (_activeTab == "Chat")
            return null;

        var app = System.Windows.Application.Current as App;
        var memory = app?.MemoryService;
        if (memory == null || !_settings.Settings.Llm.EnableAgentMemory)
            return null;

        memory.Load(GetCurrentWorkFolder());
        var docs = memory.InstructionDocuments;
        var learned = memory.All.Count;
        if (docs.Count == 0 && learned == 0)
            return null;

        var labels = docs.Take(2).Select(x => x.Label).ToList();
        var labelText = labels.Count == 0 ? "" : $" · {string.Join(", ", labels)}";
        return $"메모리 규칙 {docs.Count}개 · 학습 {learned}개 적용 중{labelText}";
    }

    private void UpdateSelectedPresetGuide(ChatConversation? conversation = null)
    {
        if (SelectedPresetGuide == null || SelectedPresetGuideTitle == null || SelectedPresetGuideDesc == null)
            return;

        conversation ??= _currentConversation;
        var hasVisibleMessages = conversation?.Messages?.Any(m =>
            !string.IsNullOrWhiteSpace(m.Content) &&
            (string.Equals(m.Role, "user", StringComparison.OrdinalIgnoreCase) ||
             string.Equals(m.Role, "assistant", StringComparison.OrdinalIgnoreCase))) == true;

        if (string.Equals(_activeTab, "Code", StringComparison.OrdinalIgnoreCase) || hasVisibleMessages || _isStreaming)
        {
            SelectedPresetGuide.Visibility = Visibility.Collapsed;
            SelectedPresetGuideTitle.Text = "";
            SelectedPresetGuideDesc.Text = "";
            return;
        }

        var category = conversation?.Category?.Trim();
        if (string.IsNullOrWhiteSpace(category))
        {
            SelectedPresetGuide.Visibility = Visibility.Collapsed;
            SelectedPresetGuideTitle.Text = "";
            SelectedPresetGuideDesc.Text = "";
            return;
        }

        var preset = PresetService.GetByTabWithCustom(_activeTab, _settings.Settings.Llm.CustomPresets)
            .FirstOrDefault(p => string.Equals(p.Category?.Trim(), category, StringComparison.OrdinalIgnoreCase));
        if (preset == null)
        {
            SelectedPresetGuide.Visibility = Visibility.Collapsed;
            SelectedPresetGuideTitle.Text = "";
            SelectedPresetGuideDesc.Text = "";
            return;
        }

        SelectedPresetGuideTitle.Text = string.Equals(_activeTab, "Cowork", StringComparison.OrdinalIgnoreCase)
            ? $"선택된 작업 유형 · {preset.Label}"
            : $"선택된 대화 주제 · {preset.Label}";
        SelectedPresetGuideDesc.Text = BuildSelectedPresetGuideDescription(preset);
        SelectedPresetGuide.Visibility = Visibility.Visible;
    }
}