/**
 * Catapult.js
 * Enemy that launches boulders and stone rain at Mario
 * Catapults appear in level 4+, Onagers (stronger) in level 5+
 */

export class Catapult {
    /**
     * Generate catapults for a level
     * @param {Object} level - Level data
     * @param {number} levelIndex - Level index
     * @param {number} levelWidth - Width of the level
     * @param {number} canvasHeight - Canvas height
     * @returns {Array} - Array of catapult objects
     */
    static generate(level, levelIndex, levelWidth, canvasHeight) {
        const catapults = [];

        let catapultCount = 1; // Always 1 catapult for level 4+
        let onagerCount = 0;

        // Level 5+ gets onagers
        if (levelIndex >= 4) {
            onagerCount = 1; // 1 onager for level 5+
        }

        const totalCount = catapultCount + onagerCount;
        console.log(`🏹 Generating ${catapultCount} catapult(s) and ${onagerCount} onager(s) for level ${levelIndex + 1}`);

        for (let i = 0; i < totalCount; i++) {
            const isOnager = i >= catapultCount; // Onagers come after catapults

            // Place catapults near END of level
            const nearEndX = levelWidth * 0.7; // 70% through level
            const catapultX = nearEndX + (i * 300) + Math.random() * 200;
            let catapultY = canvasHeight - 100; // Default: on background ground

            // Check if there's a platform, wall, or stair above this position
            const platformAbove = this._findPlatformAbove(catapultX, catapultY, level.platforms || []);
            const wallAbove = this._findWallAbove(catapultX, catapultY, level.walls || []);
            const stairAbove = this._findStairAbove(catapultX, catapultY, level.stairs || []);

            // Choose the lowest obstacle (closest to ground = highest Y value)
            const obstacles = [platformAbove, wallAbove, stairAbove].filter(obs => obs !== null);

            if (obstacles.length > 0) {
                const obstacleAbove = obstacles.reduce((lowest, current) =>
                    current.y > lowest.y ? current : lowest
                );
                catapultY = obstacleAbove.y - 80; // 80 is catapult height
                console.log(`🏹 Catapult moved to obstacle at y=${catapultY.toFixed(0)}`);
            }

            catapults.push({
                x: catapultX,
                y: catapultY,
                width: 60,
                height: 80,
                color: isOnager ? '#654321' : '#8B4513',
                lastShot: 0,
                shootCooldown: isOnager ? 6000 + Math.random() * 2000 : 4000 + Math.random() * 2000,
                type: isOnager ? 'onager' : 'catapult',
                isOnager: isOnager,
                armAngle: 0 // For rendering
            });

            console.log(`${isOnager ? '🏛️' : '🏹'} ${isOnager ? 'Onager' : 'Catapult'} placed at x=${catapultX.toFixed(0)}, y=${catapultY.toFixed(0)}`);
        }

        return catapults;
    }

    /**
     * Find platform above a position
     */
    static _findPlatformAbove(x, groundY, platforms) {
        let bestPlatform = null;
        let lowestY = 0;

        platforms.forEach(platform => {
            const catapultLeft = x;
            const catapultRight = x + 60;
            const platformLeft = platform.x;
            const platformRight = platform.x + platform.width;

            const hasHorizontalOverlap = catapultLeft < platformRight && catapultRight > platformLeft;

            if (hasHorizontalOverlap && platform.y < groundY && platform.y > lowestY) {
                bestPlatform = platform;
                lowestY = platform.y;
            }
        });

        return bestPlatform;
    }

    /**
     * Find wall above a position
     */
    static _findWallAbove(x, groundY, walls) {
        let bestWall = null;
        let lowestY = 0;

        walls.forEach(wall => {
            const catapultLeft = x;
            const catapultRight = x + 60;
            const wallLeft = wall.x;
            const wallRight = wall.x + wall.width;

            const hasHorizontalOverlap = catapultLeft < wallRight && catapultRight > wallLeft;

            if (hasHorizontalOverlap && wall.y < groundY && wall.y > lowestY) {
                bestWall = wall;
                lowestY = wall.y;
            }
        });

        return bestWall;
    }

    /**
     * Find stair above a position
     */
    static _findStairAbove(x, groundY, stairs) {
        let bestStair = null;
        let lowestY = 0;

        stairs.forEach(stair => {
            const catapultLeft = x;
            const catapultRight = x + 60;
            const stairLeft = stair.x;
            const stairRight = stair.x + stair.width;

            const hasHorizontalOverlap = catapultLeft < stairRight && catapultRight > stairLeft;

            if (hasHorizontalOverlap && stair.y < groundY && stair.y > lowestY) {
                bestStair = stair;
                lowestY = stair.y;
            }
        });

        return bestStair;
    }

    /**
     * Update all catapults
     * @param {Array} catapults - Array of catapults
     * @param {Object} mario - Mario object
     * @param {Array} boulders - Boulders array
     * @param {Array} stones - Stones array (for onagers)
     * @param {Function} playSound - Sound callback
     */
    static update(catapults, mario, boulders, stones, playSound) {
        const currentTime = Date.now();

        catapults.forEach(catapult => {
            // Arm animation
            catapult.armAngle = Math.sin(Date.now() / 200) * 0.2;

            // Check if it's time to shoot
            if (currentTime - catapult.lastShot > catapult.shootCooldown) {
                const distanceToMario = Math.abs(catapult.x - mario.x);

                // Catapult shoots boulders (single target)
                if (!catapult.isOnager && distanceToMario < 600) {
                    // Calculate trajectory to Mario
                    const dx = mario.x - catapult.x;
                    const dy = mario.y - catapult.y;
                    const distance = Math.sqrt(dx * dx + dy * dy);

                    const speed = 8;
                    const velocityX = (dx / distance) * speed;
                    const velocityY = (dy / distance) * speed;

                    boulders.push({
                        x: catapult.x + catapult.width / 2,
                        y: catapult.y,
                        velocityX: velocityX,
                        velocityY: velocityY,
                        radius: 20,
                        type: 'boulder',
                        launched: true
                    });

                    catapult.lastShot = currentTime;
                    if (playSound) playSound('jump'); // Boulder launch sound
                    console.log(`🪨 Catapult launched boulder towards Mario!`);
                }
                // Onager shoots stone rain (area attack)
                else if (catapult.isOnager && distanceToMario < 800) {
                    // Create stone rain above Mario's area
                    const stoneCount = 8 + Math.floor(Math.random() * 5); // 8-12 stones

                    for (let i = 0; i < stoneCount; i++) {
                        const offsetX = (Math.random() - 0.5) * 400; // Spread 400px around Mario

                        stones.push({
                            x: mario.x + offsetX,
                            y: -50 - Math.random() * 100, // Start above screen
                            velocityX: (Math.random() - 0.5) * 2,
                            velocityY: 2 + Math.random() * 3,
                            width: 15 + Math.random() * 10,
                            height: 15 + Math.random() * 10,
                            type: 'stone',
                            rotation: Math.random() * Math.PI * 2
                        });
                    }

                    catapult.lastShot = currentTime;
                    if (playSound) playSound('enemy_defeat'); // Different sound for stone rain
                    console.log(`☄️ Onager launched stone rain (${stoneCount} stones)!`);
                }
            }
        });
    }

    /**
     * Update boulders
     * @param {Array} boulders - Array of boulders
     * @param {Object} mario - Mario object
     * @param {Array} platforms - Platforms for collision
     * @param {Array} walls - Walls for collision
     * @param {Function} onImpact - Callback when boulder hits something
     * @returns {Array} - Updated boulders array
     */
    static updateBoulders(boulders, mario, platforms, walls, onImpact) {
        const GRAVITY = 0.3;
        const updatedBoulders = [];

        boulders.forEach((boulder, index) => {
            // Apply physics
            boulder.velocityY += GRAVITY;
            boulder.x += boulder.velocityX;
            boulder.y += boulder.velocityY;

            // Check collision with platforms
            let hitPlatform = false;
            platforms.forEach((platform, platformIndex) => {
                if (this._isCollidingCircleRect(boulder, platform)) {
                    hitPlatform = true;
                    if (onImpact) {
                        onImpact(boulder, index, boulder.x, boulder.y, platform, platformIndex, 'platform');
                    }
                }
            });

            // Check collision with walls
            let hitWall = false;
            walls.forEach((wall, wallIndex) => {
                if (this._isCollidingCircleRect(boulder, wall)) {
                    hitWall = true;
                    if (onImpact) {
                        onImpact(boulder, index, boulder.x, boulder.y, wall, wallIndex, 'wall');
                    }
                }
            });

            // Check collision with Mario
            if (this._isCollidingCircleRect(boulder, mario)) {
                if (onImpact) {
                    onImpact(boulder, index, boulder.x, boulder.y, mario, -1, 'mario');
                }
                return; // Remove boulder
            }

            // Remove if out of bounds or hit something
            if (!hitPlatform && !hitWall && boulder.y < 1000) {
                updatedBoulders.push(boulder);
            }
        });

        return updatedBoulders;
    }

    /**
     * Update stones (stone rain)
     * @param {Array} stones - Array of stones
     * @param {Object} mario - Mario object
     * @param {Array} platforms - Platforms for collision
     * @param {Function} onImpact - Callback when stone hits something
     * @returns {Array} - Updated stones array
     */
    static updateStones(stones, mario, platforms, onImpact) {
        const GRAVITY = 0.5;
        const updatedStones = [];

        stones.forEach((stone, index) => {
            // Apply physics
            stone.velocityY += GRAVITY;
            stone.x += stone.velocityX;
            stone.y += stone.velocityY;
            stone.rotation += 0.1;

            // Check collision with platforms
            let hitPlatform = false;
            platforms.forEach(platform => {
                if (this._isCollidingRectRect(stone, platform)) {
                    hitPlatform = true;
                    if (onImpact) {
                        onImpact(stone, index, 'platform');
                    }
                }
            });

            // Check collision with Mario
            if (this._isCollidingRectRect(stone, mario)) {
                if (onImpact) {
                    onImpact(stone, index, 'mario');
                }
                return; // Remove stone
            }

            // Keep stone if not hit and still on screen
            if (!hitPlatform && stone.y < 1000) {
                updatedStones.push(stone);
            }
        });

        return updatedStones;
    }

    /**
     * Circle-Rectangle collision detection
     */
    static _isCollidingCircleRect(circle, rect) {
        const closestX = Math.max(rect.x, Math.min(circle.x, rect.x + rect.width));
        const closestY = Math.max(rect.y, Math.min(circle.y, rect.y + rect.height));

        const distanceX = circle.x - closestX;
        const distanceY = circle.y - closestY;

        const distanceSquared = distanceX * distanceX + distanceY * distanceY;
        return distanceSquared < (circle.radius * circle.radius);
    }

    /**
     * Rectangle-Rectangle collision detection
     */
    static _isCollidingRectRect(rect1, rect2) {
        return rect1.x < rect2.x + rect2.width &&
               rect1.x + rect1.width > rect2.x &&
               rect1.y < rect2.y + rect2.height &&
               rect1.y + rect1.height > rect2.y;
    }
}

export default Catapult;