using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text.Json;
using Dalamud.Plugin.Services;
using Lumina.Excel.Sheets;

namespace MSQProgress;

/// <summary>
/// Maps ContentFinderCondition RowId to the Quest RowId that unlocks that duty.
/// Loaded from embedded DutyUnlockData.json (fallback) and then filled from the game's ContentFinderCondition sheet (UnlockQuest column) when DataManager is available, so all duties are covered.
/// </summary>
public static class DutyUnlockMap
{
    private static Dictionary<uint, uint>? _cfcToQuest;
    private static bool _filledFromGame;
    private static readonly object Lock = new();

    public static bool TryGetUnlockQuest(uint contentFinderConditionRowId, out uint questRowId, IDataManager? dataManager = null)
    {
        EnsureLoaded(dataManager);
        if (_cfcToQuest != null && _cfcToQuest.TryGetValue(contentFinderConditionRowId, out var q) && q != 0)
        {
            questRowId = q;
            return true;
        }
        questRowId = 0;
        return false;
    }

    private static void EnsureLoaded(IDataManager? dataManager = null)
    {
        lock (Lock)
        {
            if (_cfcToQuest == null)
            {
                _cfcToQuest = new Dictionary<uint, uint>();
                try
                {
                    var asm = Assembly.GetExecutingAssembly();
                    var name = asm.GetName().Name + ".DutyUnlockData.json";
                    using var stream = asm.GetManifestResourceStream(name);
                    if (stream != null)
                    {
                        using var reader = new StreamReader(stream);
                        var json = reader.ReadToEnd();
                        var entries = JsonSerializer.Deserialize<List<CfcQuestEntry>>(json);
                        if (entries != null)
                        {
                            foreach (var e in entries)
                            {
                                if (e.QuestRowId != 0)
                                    _cfcToQuest[e.CfcRowId] = e.QuestRowId;
                            }
                        }
                    }
                }
                catch
                {
                    // ignore
                }
            }

            if (!_filledFromGame && dataManager != null && _cfcToQuest != null)
            {
                _filledFromGame = true;
                try
                {
                    var sheet = dataManager.GetExcelSheet<ContentFinderCondition>();
                    if (sheet != null)
                    {
                        foreach (var row in sheet)
                        {
                            if (row.RowId == 0) continue;
                            var q = GetUnlockQuestFromRow(row);
                            if (q != 0)
                                _cfcToQuest[row.RowId] = q;
                        }
                    }
                }
                catch
                {
                    _filledFromGame = false;
                }
            }
        }
    }

    /// <summary>Export current CFC→Quest map to a JSON file (e.g. after loading from game). Use to regenerate DutyUnlockData.json.</summary>
    public static string? ExportToJsonFile(IDataManager dataManager, string filePath)
    {
        EnsureLoaded(dataManager);
        if (_cfcToQuest == null || _cfcToQuest.Count == 0) return null;
        try
        {
            var entries = new List<CfcQuestEntry>();
            foreach (var kv in _cfcToQuest)
            {
                if (kv.Value != 0)
                    entries.Add(new CfcQuestEntry { cfc = kv.Key, q = kv.Value });
            }
            entries.Sort((a, b) => a.CfcRowId.CompareTo(b.CfcRowId));
            var json = JsonSerializer.Serialize(entries, new JsonSerializerOptions { WriteIndented = false });
            File.WriteAllText(filePath, json);
            return filePath;
        }
        catch
        {
            return null;
        }
    }

    internal static uint GetUnlockQuestFromRow(ContentFinderCondition row)
    {
        var rowType = row.GetType();
        // Prefer known column names
        foreach (var propName in new[] { "UnlockQuest", "UnlockCriteria" })
        {
            var prop = rowType.GetProperty(propName);
            if (prop == null) continue;
            try
            {
                var val = prop.GetValue(row);
                if (val == null) continue;
                var id = ExtractQuestRowIdFromValue(val);
                if (id != 0) return id;
            }
            catch { /* ignore */ }
        }
        // Fallback: any property whose name suggests unlock/quest (Lumina may use different names)
        foreach (var prop in rowType.GetProperties(BindingFlags.Public | BindingFlags.Instance))
        {
            var name = prop.Name;
            if (!name.Contains("Unlock", StringComparison.OrdinalIgnoreCase) && !name.Contains("Quest", StringComparison.OrdinalIgnoreCase))
                continue;
            try
            {
                var val = prop.GetValue(row);
                if (val == null) continue;
                var id = ExtractQuestRowIdFromValue(val);
                if (id != 0) return id;
            }
            catch { /* ignore */ }
        }
        return 0;
    }

    /// <summary>Try to get a Quest row ID from a value (LazyRow/RowRef/ExcelRow). Handles Lumina 5 structs.</summary>
    private static uint ExtractQuestRowIdFromValue(object val)
    {
        var t = val.GetType();
        // Row.RowId (e.g. LazyRow<Quest>.Row)
        if (t.GetProperty("Row", BindingFlags.Public | BindingFlags.Instance) is PropertyInfo rowProp)
        {
            var inner = rowProp.GetValue(val);
            if (inner != null)
            {
                var innerId = GetRowIdFromObject(inner);
                if (innerId != 0) return innerId;
            }
        }
        return GetRowIdFromObject(val);
    }

    private static uint GetRowIdFromObject(object obj)
    {
        if (obj == null) return 0;
        var t = obj.GetType();
        if (t.GetProperty("RowId", BindingFlags.Public | BindingFlags.Instance) is PropertyInfo idProp)
        {
            var v = idProp.GetValue(obj);
            if (v is uint u && u != 0) return u;
            if (v is int i && i > 0) return (uint)i;
        }
        var keyProp = t.GetProperty("Key", BindingFlags.Public | BindingFlags.Instance);
        if (keyProp != null)
        {
            var v = keyProp.GetValue(obj);
            if (v is uint u && u != 0) return u;
            if (v is int i && i > 0) return (uint)i;
        }
        return 0;
    }

    private sealed class CfcQuestEntry
    {
        public uint cfc { get; set; }
        public uint q { get; set; }
        public uint CfcRowId => cfc;
        public uint QuestRowId => q;
    }
}