using System.Windows;
using AxCopilot.SDK;
using AxCopilot.Services;
using AxCopilot.Themes;

namespace AxCopilot.Handlers;

/// <summary>
/// 클립보드 히스토리 핸들러. "#" 프리픽스로 사용합니다.
/// 예: # (빈 쿼리) → 최근 클립보드 목록
///     # hello     → "hello"가 포함된 항목 필터
/// </summary>
public class ClipboardHistoryHandler : IActionHandler
{
    private readonly ClipboardHistoryService _historyService;

    public string? Prefix => "#";

    public PluginMetadata Metadata => new(
        "ClipboardHistory",
        "클립보드 히스토리 — # 뒤에 검색어 (또는 빈 입력으로 전체 보기)",
        "1.0",
        "AX");

    public ClipboardHistoryHandler(ClipboardHistoryService historyService)
    {
        _historyService = historyService;
    }

    private static readonly Dictionary<string, string> CategoryFilters = new(StringComparer.OrdinalIgnoreCase)
    {
        { "url", "URL" }, { "코드", "코드" }, { "code", "코드" },
        { "경로", "경로" }, { "path", "경로" }, { "핀", "핀" }, { "pin", "핀" },
    };

    public Task<IEnumerable<LauncherItem>> GetItemsAsync(string query, CancellationToken ct)
    {
        var history = _historyService.History;

        if (history.Count == 0)
        {
            return Task.FromResult<IEnumerable<LauncherItem>>(
            [
                new LauncherItem(
                    "클립보드 히스토리가 없습니다",
                    "텍스트를 복사하면 이 곳에 기록됩니다",
                    null, null, Symbol: Symbols.History)
            ]);
        }

        var q = query.Trim().ToLowerInvariant();

        string? catFilter = null;
        foreach (var (prefix, cat) in CategoryFilters)
        {
            if (q == prefix || q.StartsWith(prefix + " "))
            {
                catFilter = cat;
                q = q.Length > prefix.Length ? q[(prefix.Length + 1)..].Trim() : "";
                break;
            }
        }

        var filtered = history.AsEnumerable();

        if (catFilter == "핀")
            filtered = filtered.Where(e => e.IsPinned);
        else if (catFilter != null)
            filtered = filtered.Where(e => e.Category == catFilter);

        if (!string.IsNullOrEmpty(q))
            filtered = filtered.Where(e => e.Preview.ToLowerInvariant().Contains(q));

        var sorted = filtered
            .OrderByDescending(e => e.IsPinned)
            .ThenByDescending(e => e.CopiedAt);

        var items = sorted
            .Select(e =>
            {
                var pinMark = e.IsPinned ? "\uD83D\uDCCC " : "";
                var catMark = e.Category != "일반" ? $"[{e.Category}] " : "";
                return new LauncherItem(
                    $"{pinMark}{e.Preview}",
                    $"{catMark}{e.RelativeTime}  ·  {e.CopiedAt:MM/dd HH:mm}",
                    null,
                    e,
                    Symbol: e.IsPinned ? Symbols.Favorite : (e.IsText ? Symbols.History : Symbols.Picture));
            })
            .ToList();

        if (items.Count == 0)
        {
            items.Add(new LauncherItem(
                $"'{query}'에 해당하는 항목 없음",
                "#pin #url #코드 #경로 로 필터링 가능",
                null, null, Symbol: Symbols.History));
        }

        return Task.FromResult<IEnumerable<LauncherItem>>(items);
    }

    public async Task ExecuteAsync(LauncherItem item, CancellationToken ct)
    {
        if (item.Data is not ClipboardEntry entry) return;

        try
        {
            _historyService.SuppressNextCapture();
            _historyService.PromoteEntry(entry);

            if (!entry.IsText && entry.Image != null)
            {
                var originalImg = ClipboardHistoryService.LoadOriginalImage(entry.OriginalImagePath);
                Clipboard.SetImage(originalImg ?? entry.Image);
                return;
            }

            if (string.IsNullOrEmpty(entry.Text)) return;
            Clipboard.SetText(entry.Text);

            var prevWindow = WindowTracker.PreviousWindow;
            if (prevWindow == IntPtr.Zero) return;

            await ForegroundPasteHelper.PasteClipboardAsync(prevWindow, ct, initialDelayMs: 260);
        }
        catch (OperationCanceledException) { }
        catch (Exception ex)
        {
            LogService.Warn($"클립보드 히스토리 붙여넣기 실패: {ex.Message}");
        }
    }
}