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;

  final double fov = math.pi / 3;

  late LinearCoordinates player;
  late double playerAngle;

  bool _isLoading = true;
  bool _spaceWasPressed = false;

  @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;

    final Matrix<int> objectLevel = gameMap.levels[0].objectGrid;

    // 1. SCAN FOR PLAYER SPAWN
    for (int y = 0; y < 64; y++) {
      for (int x = 0; x < 64; x++) {
        int objId = objectLevel[y][x];

        // In Wolf3D, IDs 19-22 represent the player's spawn point and facing direction.
        if (objId >= 19 && objId <= 22) {
          // Place the player perfectly in the center of the block
          player = (x: x + 0.5, y: y + 0.5);

          // Map the ID to standard radians
          switch (objId) {
            case 19:
              playerAngle = 3 * math.pi / 2; // North (Facing up the Y-axis)
            case 20:
              playerAngle = 0.0; // East (Facing right)
            case 21:
              playerAngle = math.pi / 2; // South (Facing down)
            case 22:
              playerAngle = math.pi; // West (Facing left)
          }
        }
      }
    }

    // 2. CLEAN UP WALLS / PRESERVE DOORS
    for (int y = 0; y < 64; y++) {
      for (int x = 0; x < 64; x++) {
        int id = currentLevel[y][x];
        if ((id >= 1 && id <= 63) || (id >= 90 && id <= 101)) {
          // Leave walls and doors solid
        } else {
          currentLevel[y][x] = 0;
        }
      }
    }

    // 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 = 0.12;
    const double turnSpeed = 0.08;

    double moveStepX = 0;
    double moveStepY = 0;

    final pressedKeys = HardwareKeyboard.instance.logicalKeysPressed;

    // 1. Calculate intended movement amounts
    if (pressedKeys.contains(LogicalKeyboardKey.keyW)) {
      moveStepX += math.cos(playerAngle) * moveSpeed;
      moveStepY += math.sin(playerAngle) * moveSpeed;
    }
    if (pressedKeys.contains(LogicalKeyboardKey.keyS)) {
      moveStepX -= math.cos(playerAngle) * moveSpeed;
      moveStepY -= math.sin(playerAngle) * moveSpeed;
    }

    // 2. Handle Turning
    if (pressedKeys.contains(LogicalKeyboardKey.keyA)) {
      playerAngle -= turnSpeed;
    }
    if (pressedKeys.contains(LogicalKeyboardKey.keyD)) {
      playerAngle += turnSpeed;
    }
    if (playerAngle < 0) playerAngle += 2 * math.pi;
    if (playerAngle > 2 * math.pi) playerAngle -= 2 * math.pi;

    // 3. Wall Sliding Collision (with Hitbox Margin!)
    // A 0.3 margin keeps the camera plane safely out of the walls
    const double margin = 0.3;

    double newX = player.x + moveStepX;
    // Check the edge of our hitbox, not just the center point
    int checkX = (moveStepX > 0)
        ? (newX + margin).toInt()
        : (newX - margin).toInt();

    // Try to move along the X axis
    if (currentLevel[player.y.toInt()][checkX] == 0) {
      player = (x: newX, y: player.y);
    }

    double newY = player.y + moveStepY;
    int checkY = (moveStepY > 0)
        ? (newY + margin).toInt()
        : (newY - margin).toInt();

    // Try to move along the Y axis
    if (currentLevel[checkY][player.x.toInt()] == 0) {
      player = (x: player.x, y: newY);
    }

    // 4. DOOR INTERACTION LOGIC
    bool isSpacePressed = pressedKeys.contains(LogicalKeyboardKey.space);

    if (isSpacePressed && !_spaceWasPressed) {
      int targetX = (player.x + math.cos(playerAngle)).toInt();
      int targetY = (player.y + math.sin(playerAngle)).toInt();

      if (targetY > 0 &&
          targetY < currentLevel.length &&
          targetX > 0 &&
          targetX < currentLevel[0].length) {
        int targetBlock = currentLevel[targetY][targetX];

        if (targetBlock >= 90) {
          currentLevel[targetY][targetX] = 0;
        }
      }
    }
    _spaceWasPressed = isSpacePressed;

    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,
              ),
            );
          },
        ),
      ),
    );
  }
}