import 'dart:math' as math;

import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
import 'package:wolf_dart/classes/linear_coordinates.dart';
import 'package:wolf_dart/classes/matrix.dart';
import 'package:wolf_dart/features/map/wolf_map.dart';
import 'package:wolf_dart/features/renderer/raycast_painter.dart';

class WolfRenderer extends StatefulWidget {
  const WolfRenderer({super.key});

  @override
  State<WolfRenderer> createState() => _WolfRendererState();
}

class _WolfRendererState extends State<WolfRenderer>
    with SingleTickerProviderStateMixin {
  late Ticker _gameLoop;
  final FocusNode _focusNode = FocusNode();
  late WolfMap gameMap;
  late Matrix<int> currentLevel;

  bool _isLoading = true;

  LinearCoordinates player = (x: 2.5, y: 2.5);
  double playerAngle = 0.0;
  final double fov = math.pi / 3;

  @override
  void initState() {
    super.initState();
    _initGame();
  }

  Future<void> _initGame() async {
    // 1. Load the entire WAD/WL1 data
    gameMap = await WolfMap.load();

    // 2. Extract Level 1 (E1M1)
    currentLevel = gameMap.levels[0].wallGrid;

    // 3. (Optional) Remap the Wolf3D floor IDs so they work with your raycaster.
    // In Wolf3D, 90 through 106 are usually empty floor. Your raycaster currently
    // expects 0 to be empty space. Let's force them to 0 for now.
    for (int y = 0; y < 64; y++) {
      for (int x = 0; x < 64; x++) {
        // In Wolf3D, wall values are 1 through ~63.
        // Values 90+ represent empty floor spaces and doors.
        // Let's zero out anything 90 or above, and LEAVE the walls alone.
        if (currentLevel[y][x] >= 90) {
          currentLevel[y][x] = 0; // Empty space
        }
      }
    }

    // 4. Start the game!
    _bumpPlayerIfStuck();
    _gameLoop = createTicker(_tick)..start();
    _focusNode.requestFocus();

    setState(() {
      _isLoading = false;
    });
  }

  @override
  void dispose() {
    _gameLoop.dispose();
    _focusNode.dispose();
    super.dispose();
  }

  void _bumpPlayerIfStuck() {
    int pX = player.x.toInt();
    int pY = player.y.toInt();

    if (pY < 0 ||
        pY >= currentLevel.length ||
        pX < 0 ||
        pX >= currentLevel[0].length ||
        currentLevel[pY][pX] > 0) {
      double shortestDist = double.infinity;
      LinearCoordinates nearestSafeSpot = (x: 1.5, y: 1.5);

      for (int y = 0; y < currentLevel.length; y++) {
        for (int x = 0; x < currentLevel[y].length; x++) {
          if (currentLevel[y][x] == 0) {
            double safeX = x + 0.5;
            double safeY = y + 0.5;
            double dist = math.sqrt(
              math.pow(safeX - player.x, 2) + math.pow(safeY - player.y, 2),
            );

            if (dist < shortestDist) {
              shortestDist = dist;
              nearestSafeSpot = (x: safeX, y: safeY);
            }
          }
        }
      }
      player = nearestSafeSpot;
    }
  }

  void _tick(Duration elapsed) {
    const double moveSpeed = 0.05;
    const double turnSpeed = 0.04;

    double newX = player.x;
    double newY = player.y;

    final pressedKeys = HardwareKeyboard.instance.logicalKeysPressed;

    if (pressedKeys.contains(LogicalKeyboardKey.keyW)) {
      newX += math.cos(playerAngle) * moveSpeed;
      newY += math.sin(playerAngle) * moveSpeed;
    }
    if (pressedKeys.contains(LogicalKeyboardKey.keyS)) {
      newX -= math.cos(playerAngle) * moveSpeed;
      newY -= math.sin(playerAngle) * moveSpeed;
    }

    if (pressedKeys.contains(LogicalKeyboardKey.keyA)) {
      playerAngle -= turnSpeed;
    }
    if (pressedKeys.contains(LogicalKeyboardKey.keyD)) {
      playerAngle += turnSpeed;
    }

    // Keep the angle mapped cleanly between 0 and 2*PI (optional, but good practice)
    if (playerAngle < 0) playerAngle += 2 * math.pi;
    if (playerAngle > 2 * math.pi) playerAngle -= 2 * math.pi;

    if (currentLevel[newY.toInt()][newX.toInt()] == 0) {
      player = (x: newX, y: newY);
    }

    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    if (_isLoading) {
      return const Center(child: CircularProgressIndicator(color: Colors.teal));
    }

    return Scaffold(
      backgroundColor: Colors.black,
      body: KeyboardListener(
        focusNode: _focusNode,
        autofocus: true,
        onKeyEvent: (_) {},
        child: LayoutBuilder(
          builder: (context, constraints) {
            return CustomPaint(
              size: Size(constraints.maxWidth, constraints.maxHeight),
              painter: RaycasterPainter(
                map: currentLevel,
                textures: gameMap.textures,
                player: player,
                playerAngle: playerAngle,
                fov: fov,
              ),
            );
          },
        ),
      ),
    );
  }
}