using System;
using System.Collections.Generic;
using System.Linq;
using Cirno.Scripts.Components.FSM.Enemy;
using Cirno.Scripts.Resources;
using Cirno.Scripts.Resources.Roguelite;
using Godot;
using Godot.Collections;

namespace Cirno.Scripts.Controllers;

public partial class RogueliteRoom : Node2D
{
    [Export] public RogueliteRoomResource RoomResource { get; set; }

    public Vector2I GridPosition { get; set; } // Set by dungeon manager

    [Export] public PackedScene DoorPrefab { get; private set; }
    [Export] public PackedScene WallPrefab { get; private set; }

    private static readonly Godot.Collections.Dictionary<string, Vector2I> DirectionMap = new()
    {
        { "North", new Vector2I(0, -1) },
        { "South", new Vector2I(0, 1) },
        { "East", new Vector2I(1, 0) },
        { "West", new Vector2I(-1, 0) },
    };

    private List<Door> _doors = [];
    private List<RoomConnection> _connections = [];
    private List<EnemyFSMProxy> _enemies = [];

    private Array<EnemyResource> SpawnableEnemies => RoomResource.SpawnableEnemies;

    public RogueliteRoom Spawn()
    {
        SpawnEnemies();
        //HandleDoors(connectionChecker);
        AddDebugLabel();
        return this;
    }

    private void AddDebugLabel()
    {
        for (int i = 0; i < RoomResource.Size.X; i++)
        {
            for (int j = 0; j < RoomResource.Size.Y; j++)
            {
                var label = new Label();
                label.Text = $"{GridPosition + new Vector2I(i, j)}";
                label.ZIndex = 11;
                label.Position = (new Vector2(i, j) * new Vector2(320, 160)) + new Vector2(160, 80);
                this.AddChild(label);
            }
        }
    }

    public void HandleDoors(Func<Vector2I, Vector2I, RoomConnection> connectionChecker)
    {
        if (!HasNode("Doors")) return;
        var doorsNode = GetNode("Doors");

        foreach (Node child in doorsNode.GetChildren())
        {
            if (child is not DoorMarker marker) continue;

            var baseDir = marker.GetWorldDirection();

            // WallIndex determines the offset *along* the edge of the room
            Vector2I offset = marker.Direction switch
            {
                RoomDirection.North => new Vector2I(marker.WallIndex, 0),
                RoomDirection.South => new Vector2I(marker.WallIndex, RoomResource.Size.Y - 1),
                RoomDirection.East => new Vector2I(RoomResource.Size.X - 1, marker.WallIndex),
                RoomDirection.West => new Vector2I(0, marker.WallIndex),
                _ => Vector2I.Zero
            };

            // Combine GridPosition + offset to locate where this door aligns
            Vector2I doorEdge = GridPosition + offset;
            Vector2I neighborPos = doorEdge + baseDir;

            var connection = connectionChecker.Invoke(doorEdge, neighborPos);

            var connected = connection is not null;

            if (connected)
            {
                var door = this.CreateChildOf<Door>(marker, DoorPrefab, marker.GlobalPosition);

                door.State = DoorState.Closed;

                _doors.Add(door);

                if (doorEdge == connection.From)
                {
                    connection.FromDoor = door;
                }
                else if (doorEdge == connection.To)
                {
                    connection.ToDoor = door;
                }
                else
                {
                    GD.Print($"Door {door} connection was full: {connection.From} {connection.FromDoor} to {connection.To} {connection.ToDoor}");
                }
                
                // if (connection.FromDoor is null && connection.ToDoor != door)
                // {
                //     connection.FromDoor = door;
                // }
                // else if (connection.ToDoor is null && connection.FromDoor != door)
                // {
                //     connection.ToDoor = door;
                // }
                // else
                // {
                //     GD.Print($"Door {door} connection was full: {connection.From} {connection.FromDoor} to {connection.To} {connection.ToDoor}");
                // }
                
                _connections.Add(connection);

                // var label = new Label();
                // label.Text = $"Door Edge: {doorEdge}, {connection}";
                // label.ZIndex = 10;
                //
                // door.AddChild(label);
            }
            else
            {
                var wall = this.CreateChild<Node2D>(WallPrefab, marker.GlobalPosition);

                // var label = new Label();
                // label.Text = $"Door Edge: {doorEdge}, Neighbor: {neighborPos}";
                // label.ZIndex = 10;
                //
                // marker.AddChild(label);
            }
            
        }
    }

    private void SpawnEnemies()
    {
        if (SpawnableEnemies is null || !SpawnableEnemies.Any()) return;

        var enemySpawners = this.GetNode("EnemySpawners").GetChildren().Cast<Marker2D>();

        foreach (var spawner in enemySpawners)
        {
            var index = GD.RandRange(0, SpawnableEnemies.Count - 1);

            var e = SpawnableEnemies[index];

            var enemyScene = GD.Load<PackedScene>(e.PrefabPath);
            var spawnedEnemy = spawner.CreateChild<EnemyFSMProxy>(enemyScene);
            
            _enemies.Add(spawnedEnemy);
            
            spawnedEnemy.Death += SpawnedEnemyOnDeath;
        }
    }

    private void SpawnedEnemyOnDeath(EnemyFSMProxy enemy)
    {
        enemy.Death -= SpawnedEnemyOnDeath;
        _enemies.Remove(enemy);

        if (_enemies.Count == 0)
        {
            OpenDoors();
        }
    }

    public void OpenDoors()
    {
        foreach (var connection in _connections)
        {
            connection.FromDoor?.Open();
            connection.ToDoor?.Open();
        }
    }

    public void CloseDoors()
    {
        foreach (var connection in _connections)
        {
            connection.FromDoor?.Close();
            connection.ToDoor?.Close();
        }
    }

    private void OnRoomEntered(Area2D area)
    {
        if (area is not InteractionController player) return;
        
        if (_enemies.Count <= 0)
        {
            OpenDoors();
        }
        else
        {
            CloseDoors();
        }
    }
    
    private void OnRoomExited(Area2D area)
    {
        if (area is not InteractionController player) return;
    }
}