// 动物系统类
class AnimalSystem {
    constructor(canvas) {
        this.animals = [];
        this.maxAnimals = 8; // 降低最大动物数量
        this.canvas = canvas || document.getElementById('gameCanvas');
    }
    
    update(deltaTime) {
        const dt = deltaTime * 0.001;
        
        for (let i = this.animals.length - 1; i >= 0; i--) {
            const animal = this.animals[i];
            this.updateAnimal(animal, dt);
            
            // 移除离开屏幕或生命周期结束的动物
            if (animal.shouldRemove) {
                this.animals.splice(i, 1);
            }
        }
    }
    
    updateAnimal(animal, dt) {
        switch (animal.state) {
            case 'entering':
                this.updateEntering(animal, dt);
                break;
            case 'seeking':
                this.updateSeeking(animal, dt);
                break;
            case 'eating':
                this.updateEating(animal, dt);
                break;
            case 'satisfied':
                this.updateSatisfied(animal, dt);
                break;
            case 'leaving':
                this.updateLeaving(animal, dt);
                break;
        }
        
        // 更新动画
        animal.animationTime += dt;
        
        // 更新位置
        animal.x += animal.vx * dt;
        animal.y += animal.vy * dt;
        
        // 更新生命周期
        animal.lifeTime += dt;
        if (animal.maxLifeTime && animal.lifeTime > animal.maxLifeTime) {
            animal.shouldRemove = true;
        }
    }
    
    updateEntering(animal, dt) {
        // 动物从屏幕边缘进入 - 使用显示尺寸而不是内部像素尺寸
        const rect = this.canvas ? this.canvas.getBoundingClientRect() : { width: 800, height: 600 };
        const displayWidth = rect.width;
        const displayHeight = rect.height;
        
        const targetX = animal.side === 'left' ? 100 : displayWidth - 100;
        const targetY = displayHeight - 100; // 距离底部100像素
        
        console.log(`Canvas显示尺寸: ${displayWidth}x${displayHeight}, 目标位置: (${targetX}, ${targetY})`);
        
        const dx = targetX - animal.x;
        const dy = targetY - animal.y;
        const distance = Math.sqrt(dx * dx + dy * dy);
        
        console.log(`动物${animal.type}进入中: 当前位置(${animal.x.toFixed(1)}, ${animal.y.toFixed(1)}), 目标位置(${targetX}, ${targetY}), 距离: ${distance.toFixed(1)}`);
        
        if (distance < 20) {
            animal.state = 'seeking';
            animal.vx = 0;
            animal.vy = 0;
            console.log(`动物${animal.type}已进入屏幕，状态改为seeking`);
        } else {
            animal.vx = (dx / distance) * animal.speed;
            animal.vy = (dy / distance) * animal.speed;
        }
    }
    
    updateSeeking(animal, dt) {
        // 寻找食物
        const food = this.findNearestFood(animal);
        
        if (food) {
            console.log(`${animal.type}找到食物: ${food.foodType}, 距离: ${Math.sqrt((food.x - animal.x)**2 + (food.y - animal.y)**2).toFixed(1)}`);
            const dx = food.x - animal.x;
            const dy = food.y - animal.y;
            const distance = Math.sqrt(dx * dx + dy * dy);
            
            if (distance < 30) {
                // 开始吃食物
                animal.state = 'eating';
                animal.targetFood = food;
                animal.eatingTime = 0;
                animal.vx = 0;
                animal.vy = 0;
                console.log(`${animal.type}开始吃食物!`);
            } else {
                // 移动向食物
                animal.vx = (dx / distance) * animal.speed * 0.8;
                animal.vy = (dy / distance) * animal.speed * 0.8;
            }
        } else {
            // 没有找到食物，随机移动
            if (Math.random() < 0.1) { // 增加调试输出频率
                console.log(`${animal.type}没有找到食物，喜欢: ${animal.preferredFood}, 随机移动`);
                animal.vx = (Math.random() - 0.5) * animal.speed * 0.5;
                animal.vy = (Math.random() - 0.5) * animal.speed * 0.5;
            }
        }
        
        // 如果寻找时间太长，离开
        if (animal.lifeTime > 10) {
            animal.state = 'leaving';
        }
    }
    
    updateEating(animal, dt) {
        animal.eatingTime += dt;
        
        // 吃食物动画
        if (animal.eatingTime > 0.5 && animal.targetFood) {
            // 移除食物粒子
            this.removeFoodParticle(animal.targetFood);
            animal.targetFood = null;
            animal.foodEaten++;
        }
        
        if (animal.eatingTime > 1) {
            if (animal.foodEaten >= animal.maxFood) {
                animal.state = 'satisfied';
            } else {
                animal.state = 'seeking';
            }
        }
    }
    
    updateSatisfied(animal, dt) {
        // 满足后的短暂停留
        animal.satisfiedTime = (animal.satisfiedTime || 0) + dt;
        
        if (animal.satisfiedTime > 2) {
            animal.state = 'leaving';
        }
    }
    
    updateLeaving(animal, dt) {
        // 离开屏幕
        const exitX = animal.side === 'left' ? -50 : this.canvas.width + 50;
        const dx = exitX - animal.x;
        const distance = Math.abs(dx);
        
        if (distance < 10) {
            animal.shouldRemove = true;
        } else {
            animal.vx = (dx / distance) * animal.speed * 1.2;
            animal.vy = 0;
        }
    }
    
    findNearestFood(animal) {
        // 从游戏主类获取粒子系统
        if (!window.game || !window.game.particleSystem) return null;
        
        const particles = window.game.particleSystem.particles;
        let nearestFood = null;
        let nearestDistance = Infinity;
        let totalFood = 0;
        let groundedFood = 0;
        let matchingFood = 0;
        
        particles.forEach(particle => {
            if (particle.type === 'food') {
                totalFood++;
                if (particle.isGrounded) {
                    groundedFood++;
                    if (particle.foodType === animal.preferredFood) {
                        matchingFood++;
                        const dx = particle.x - animal.x;
                        const dy = particle.y - animal.y;
                        const distance = Math.sqrt(dx * dx + dy * dy);
                        
                        if (distance < nearestDistance) {
                            nearestDistance = distance;
                            nearestFood = particle;
                        }
                    }
                }
            }
        });
        
        // 每隔一段时间输出调试信息
        if (Math.random() < 0.01) {
            console.log(`${animal.type}寻找食物: 总食物=${totalFood}, 落地食物=${groundedFood}, 匹配食物=${matchingFood}, 喜欢=${animal.preferredFood}`);
            if (totalFood > 0) {
                console.log(`示例食物类型: ${particles.find(p => p.type === 'food')?.foodType}`);
            }
        }
        
        return nearestFood;
    }
    
    removeFoodParticle(foodParticle) {
        if (!window.game || !window.game.particleSystem) return;
        
        const particles = window.game.particleSystem.particles;
        const index = particles.indexOf(foodParticle);
        if (index > -1) {
            particles.splice(index, 1);
            
            // 创建吃食物的特效
            window.game.particleSystem.createSparkleParticles(
                foodParticle.x, 
                foodParticle.y, 
                5
            );
        }
    }
    
    createAnimal(foodType, side = 'left') {
        if (this.animals.length >= this.maxAnimals) {
            console.log(`已达到最大动物数量: ${this.maxAnimals}`);
            return null;
        }
        
        const animalType = this.getAnimalForFood(foodType);
        // 使用显示尺寸而不是内部像素尺寸
        const rect = this.canvas ? this.canvas.getBoundingClientRect() : { width: 800, height: 600 };
        const displayWidth = rect.width;
        const displayHeight = rect.height;
        const startX = side === 'left' ? -50 : displayWidth + 50;
        const startY = displayHeight - 60;
        
        console.log(`Canvas显示尺寸: ${displayWidth}x${displayHeight}, 动物起始位置: (${startX}, ${startY})`);
        
        const animal = {
            x: startX,
            y: startY,
            vx: 0,
            vy: 0,
            type: animalType,
            side: side,
            state: 'entering',
            speed: Math.random() * 30 + 40,
            size: Math.random() * 20 + 30,
            preferredFood: foodType,
            foodEaten: 0,
            maxFood: Math.floor(Math.random() * 3) + 2,
            animationTime: 0,
            lifeTime: 0,
            maxLifeTime: 30, // 30秒后自动离开
            shouldRemove: false,
            color: this.getAnimalColor(animalType),
            emoji: this.getAnimalEmoji(animalType)
        };
        
        this.animals.push(animal);
        console.log(`动物已创建: ${animalType}, 位置: (${animal.x}, ${animal.y}), 当前动物总数: ${this.animals.length}`);
        console.log(`动物详细信息:`, animal);
        return animal;
    }
    
    createLittleGirl(side = 'right') {
        // 使用显示尺寸而不是内部像素尺寸
        const rect = this.canvas ? this.canvas.getBoundingClientRect() : { width: 800, height: 600 };
        const displayWidth = rect.width;
        const displayHeight = rect.height;
        const startX = side === 'left' ? -50 : displayWidth + 50;
        const startY = displayHeight - 80;
        
        console.log(`小女孩Canvas显示尺寸: ${displayWidth}x${displayHeight}, 起始位置: (${startX}, ${startY})`);
        
        const girl = {
            x: startX,
            y: startY,
            vx: 0,
            vy: 0,
            type: 'girl',
            side: side,
            state: 'entering',
            speed: 60,
            size: 40,
            preferredFood: ['strawberry', 'watermelon'],
            foodEaten: 0,
            maxFood: 5,
            animationTime: 0,
            lifeTime: 0,
            maxLifeTime: 45,
            shouldRemove: false,
            color: '#FFB6C1',
            emoji: '👧',
            isSpecial: true
        };
        
        this.animals.push(girl);
        console.log(`小女孩已创建: 位置: (${girl.x}, ${girl.y}), 当前动物总数: ${this.animals.length}`);
        return girl;
    }
    
    getAnimalForFood(foodType) {
        const animalMap = {
            'apple': 'rabbit',
            'banana': 'monkey',
            'orange': 'bird',
            'strawberry': 'bear',
            'watermelon': 'elephant',
            'grape': 'fox',
            'pizza': 'cat',
            'burger': 'dog',
            'cake': 'mouse',
            'cookie': 'squirrel',
            'bread': 'duck',
            'cheese': 'rat',
            'fish': 'cat',
            'chicken': 'dog',
            'rice': 'bird',
            'noodles': 'panda',
            'carrot': 'rabbit',
            'corn': 'chicken'
        };
        
        return animalMap[foodType] || 'cat';
    }
    
    getAnimalColor(animalType) {
        const colorMap = {
            'rabbit': '#F5DEB3',
            'monkey': '#DEB887',
            'bird': '#87CEEB',
            'bear': '#8B4513',
            'elephant': '#A9A9A9',
            'fox': '#FF8C00',
            'cat': '#FFB6C1',
            'dog': '#DEB887',
            'mouse': '#C0C0C0',
            'squirrel': '#D2691E',
            'duck': '#FFFF00',
            'rat': '#808080',
            'panda': '#000000',
            'chicken': '#FFFF00'
        };
        
        return colorMap[animalType] || '#FFB6C1';
    }
    
    getAnimalEmoji(animalType) {
        const emojiMap = {
            'rabbit': '🐰',
            'monkey': '🐵',
            'bird': '🐦',
            'bear': '🐻',
            'elephant': '🐘',
            'fox': '🦊',
            'cat': '🐱',
            'dog': '🐶',
            'mouse': '🐭',
            'squirrel': '🐿️',
            'duck': '🦆',
            'rat': '🐀',
            'panda': '🐼',
            'chicken': '🐔'
        };
        
        return emojiMap[animalType] || '🐱';
    }
    
    render(ctx) {
        if (this.animals.length > 0) {
            console.log(`渲染${this.animals.length}个动物`);
        }
        this.animals.forEach(animal => {
            this.renderAnimal(ctx, animal);
        });
    }
    
    renderAnimal(ctx, animal) {
        ctx.save();
        
        // 调试信息：在控制台显示渲染信息（仅首次）
        if (!animal.debugRendered) {
            console.log(`正在渲染动物: ${animal.type}, 位置: (${animal.x}, ${animal.y}), emoji: ${animal.emoji}, 尺寸: ${animal.size}`);
            animal.debugRendered = true;
        }
        
        // 移动到动物位置
        ctx.translate(animal.x, animal.y);
        
        // 翻转方向
        if (animal.vx < 0) {
            ctx.scale(-1, 1);
        }
        
        // 绘制阴影
        ctx.fillStyle = 'rgba(0, 0, 0, 0.2)';
        ctx.beginPath();
        ctx.ellipse(0, animal.size * 0.4, animal.size * 0.6, animal.size * 0.2, 0, 0, Math.PI * 2);
        ctx.fill();
        
        // 绘制动物主体
        if (animal.emoji) {
            ctx.font = `${animal.size}px Arial`;
            ctx.textAlign = 'center';
            ctx.textBaseline = 'middle';
            ctx.fillStyle = '#000000';
            ctx.fillText(animal.emoji, 0, -animal.size * 0.2);
        } else {
            // 备用：绘制简单的动物形状
            this.renderSimpleAnimal(ctx, animal);
        }
        
        // 绘制调试信息（显示动物类型）
        ctx.font = '12px Arial';
        ctx.fillStyle = '#FF0000';
        ctx.fillText(animal.type, 0, animal.size * 0.6);
        
        // 绘制状态指示器
        this.renderAnimalState(ctx, animal);
        
        // 绘制动画效果
        this.renderAnimalEffects(ctx, animal);
        
        ctx.restore();
    }
    
    renderSimpleAnimal(ctx, animal) {
        // 身体
        ctx.fillStyle = animal.color;
        ctx.beginPath();
        ctx.ellipse(0, 0, animal.size * 0.4, animal.size * 0.3, 0, 0, Math.PI * 2);
        ctx.fill();
        
        // 头部
        ctx.beginPath();
        ctx.ellipse(0, -animal.size * 0.3, animal.size * 0.3, animal.size * 0.25, 0, 0, Math.PI * 2);
        ctx.fill();
        
        // 眼睛
        ctx.fillStyle = '#000000';
        ctx.beginPath();
        ctx.arc(-animal.size * 0.1, -animal.size * 0.35, 2, 0, Math.PI * 2);
        ctx.arc(animal.size * 0.1, -animal.size * 0.35, 2, 0, Math.PI * 2);
        ctx.fill();
    }
    
    renderAnimalState(ctx, animal) {
        // 根据状态显示不同的指示器
        switch (animal.state) {
            case 'eating':
                // 显示爱心
                ctx.fillStyle = '#FF69B4';
                ctx.font = '16px Arial';
                ctx.textAlign = 'center';
                ctx.fillText('💖', 0, -animal.size * 0.8);
                break;
            case 'satisfied':
                // 显示满足表情
                ctx.fillStyle = '#32CD32';
                ctx.font = '16px Arial';
                ctx.textAlign = 'center';
                ctx.fillText('😊', 0, -animal.size * 0.8);
                break;
        }
    }
    
    renderAnimalEffects(ctx, animal) {
        // 特殊动物的额外效果
        if (animal.isSpecial) {
            // 小女孩的闪光效果
            const sparkleCount = 3;
            const time = animal.animationTime * 2;
            
            ctx.fillStyle = '#FFD700';
            for (let i = 0; i < sparkleCount; i++) {
                const angle = (i / sparkleCount) * Math.PI * 2 + time;
                const radius = animal.size * 0.8;
                const x = Math.cos(angle) * radius;
                const y = Math.sin(angle) * radius;
                
                ctx.beginPath();
                ctx.arc(x, y, 3, 0, Math.PI * 2);
                ctx.fill();
            }
        }
        
        // 移动时的灰尘效果
        if (Math.abs(animal.vx) > 10 && animal.state !== 'eating') {
            ctx.fillStyle = 'rgba(139, 69, 19, 0.3)';
            for (let i = 0; i < 3; i++) {
                const dustX = -animal.vx * 0.1 * (i + 1) + (Math.random() - 0.5) * 10;
                const dustY = animal.size * 0.3 + Math.random() * 5;
                
                ctx.beginPath();
                ctx.arc(dustX, dustY, Math.random() * 3 + 1, 0, Math.PI * 2);
                ctx.fill();
            }
        }
    }
    
    // 清理所有动物
    clear() {
        this.animals = [];
    }
    
    // 获取动物数量
    getAnimalCount() {
        return this.animals.length;
    }
    
    // 获取特定类型的动物数量
    getAnimalCountByType(type) {
        return this.animals.filter(animal => animal.type === type).length;
    }
    
    // 移除指定的动物
    removeAnimal(animal) {
        const index = this.animals.indexOf(animal);
        if (index > -1) {
            this.animals.splice(index, 1);
        }
    }
    
    // 让所有动物离开
    makeAllAnimalsLeave() {
        this.animals.forEach(animal => {
            if (animal.state !== 'leaving') {
                animal.state = 'leaving';
            }
        });
    }
}