using System;
using System.Linq;
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 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 Array<EnemyResource> SpawnableEnemies => RoomResource.SpawnableEnemies;

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

    public void HandleDoors(Func<Vector2I, bool> 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 or RoomDirection.South => new Vector2I(marker.WallIndex, 0),
                RoomDirection.East or 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;

            bool connected = connectionChecker.Invoke(neighborPos);
            
            if (connected)
            {
                var door = this.CreateChild<Door>(DoorPrefab, marker.GlobalPosition);

                door.State = DoorState.Open;
            }
            else
            {
                var wall = this.CreateChild<Node2D>(WallPrefab, marker.GlobalPosition);
            }

            // PackedScene prefab = hasConnection
            //     ? GD.Load<PackedScene>("res://Prefabs/Door.tscn")
            //     : GD.Load<PackedScene>("res://Prefabs/Wall.tscn");
            //
            // var instance = prefab.Instantiate<Node2D>();
            // AddChild(instance);
            // instance.GlobalPosition = ((Node2D)child).GlobalPosition;
            // instance.Rotation = ((Node2D)child).GlobalRotation;
        }
    }

    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<Node2D>(enemyScene);
        }
    }
}