from datetime import datetime, timedelta
from flask_sqlalchemy import SQLAlchemy
from flask_login import UserMixin
from werkzeug.security import generate_password_hash, check_password_hash
from app import db
import random
import string

class User(UserMixin, db.Model):
    __tablename__ = 'users'
    
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(255), unique=True, nullable=False, index=True)
    password_hash = db.Column(db.String(255), nullable=False)
    name = db.Column(db.String(100), nullable=False)
    age = db.Column(db.SmallInteger, nullable=False)
    gender = db.Column(db.SmallInteger, nullable=False, comment='0-男, 1-女')
    parent_contact = db.Column(db.String(255), nullable=True, comment='家长联系方式')
    is_verified = db.Column(db.Boolean, default=False, comment='邮箱是否验证')
    created_at = db.Column(db.DateTime, default=datetime.utcnow, index=True)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    
    # 关联关系
    voice_samples = db.relationship('VoiceSample', backref='user', lazy='dynamic', cascade='all, delete-orphan')
    user_sessions = db.relationship('UserSession', backref='user', lazy='dynamic', cascade='all, delete-orphan')
    user_progress = db.relationship('UserProgress', backref='user', lazy='dynamic', cascade='all, delete-orphan')
    
    def set_password(self, password):
        """设置密码"""
        self.password_hash = generate_password_hash(password)
    
    def check_password(self, password):
        """验证密码"""
        return check_password_hash(self.password_hash, password)
    
    def get_latest_voice_sample(self):
        """获取最新的语音样本"""
        return self.voice_samples.order_by(VoiceSample.upload_time.desc()).first()
    
    def has_voice_clone_model(self):
        """检查是否有可用的声音克隆模型"""
        latest_sample = self.get_latest_voice_sample()
        return latest_sample and latest_sample.clone_model_status == 'ready'
    
    def __repr__(self):
        return f'<User {self.email}>'

class EmailVerification(db.Model):
    __tablename__ = 'email_verifications'
    
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(255), nullable=False, index=True)
    verification_code = db.Column(db.String(6), nullable=False, comment='6位数字验证码')
    expires_at = db.Column(db.DateTime, nullable=False, index=True)
    is_used = db.Column(db.Boolean, default=False, comment='是否已使用')
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    
    @classmethod
    def generate_code(cls, email, expire_minutes=5):
        """生成验证码"""
        # 清理过期的验证码
        cls.query.filter(
            cls.email == email,
            cls.expires_at < datetime.utcnow()
        ).delete()
        
        # 生成6位数字验证码
        code = ''.join(random.choices(string.digits, k=6))
        expires_at = datetime.utcnow() + timedelta(minutes=expire_minutes)
        
        verification = cls(
            email=email,
            verification_code=code,
            expires_at=expires_at
        )
        
        db.session.add(verification)
        db.session.commit()
        
        return code
    
    @classmethod
    def verify_code(cls, email, code):
        """验证验证码"""
        verification = cls.query.filter(
            cls.email == email,
            cls.verification_code == code,
            cls.expires_at > datetime.utcnow(),
            cls.is_used == False
        ).first()
        
        if verification:
            verification.is_used = True
            db.session.commit()
            return True
        return False
    
    def __repr__(self):
        return f'<EmailVerification {self.email}>'

class VoiceSample(db.Model):
    __tablename__ = 'voice_samples'
    
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    original_audio_url = db.Column(db.String(500), nullable=False, comment='原始语音文件URL')
    upload_time = db.Column(db.DateTime, default=datetime.utcnow)
    file_size = db.Column(db.Integer, nullable=True, comment='文件大小(字节)')
    duration = db.Column(db.Numeric(5,2), nullable=True, comment='音频时长(秒)')
    recognized_text = db.Column(db.Text, nullable=True, comment='语音识别文本')
    clone_model_status = db.Column(db.String(20), default='pending', comment='克隆模型状态: pending/training/ready/failed')
    clone_model_path = db.Column(db.String(500), nullable=True, comment='克隆模型文件路径')
    clone_quality_score = db.Column(db.Numeric(3,2), nullable=True, comment='克隆质量评分(0-10)')
    
    def __repr__(self):
        return f'<VoiceSample {self.user_id}:{self.id}>'

class ScenarioCategory(db.Model):
    __tablename__ = 'scenario_categories'
    
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(100), nullable=False, comment='分类名称')
    description = db.Column(db.Text, nullable=True, comment='分类描述')
    icon = db.Column(db.String(50), default='fas fa-folder', comment='图标类名')
    color = db.Column(db.String(20), default='primary', comment='主题色')
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    
    # 关联关系
    scenarios = db.relationship('Scenario', backref='category', lazy='dynamic')
    
    def __repr__(self):
        return f'<ScenarioCategory {self.name}>'

class Scenario(db.Model):
    __tablename__ = 'scenarios'
    
    id = db.Column(db.Integer, primary_key=True)
    category_id = db.Column(db.Integer, db.ForeignKey('scenario_categories.id'), nullable=False)
    title = db.Column(db.String(255), nullable=False, comment='场景标题')
    description = db.Column(db.Text, nullable=True, comment='场景描述')
    icon = db.Column(db.String(50), default='fas fa-comments', comment='场景图标')
    min_questions = db.Column(db.Integer, default=5, comment='最少问题数')
    max_questions = db.Column(db.Integer, default=15, comment='最多问题数')
    difficulty_level = db.Column(db.SmallInteger, default=1, comment='难度等级1-5')
    is_active = db.Column(db.Boolean, default=True, comment='是否激活')
    play_count = db.Column(db.Integer, default=0, comment='游玩次数')
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    
    # 关联关系
    questions = db.relationship('ScenarioQuestion', backref='scenario', lazy='dynamic')
    user_sessions = db.relationship('UserSession', backref='scenario', lazy='dynamic')
    user_progress = db.relationship('UserProgress', backref='scenario', lazy='dynamic')
    
    def get_difficulty_badge(self):
        """获取难度徽章样式"""
        if self.difficulty_level == 1:
            return 'success'
        elif self.difficulty_level == 2:
            return 'warning'
        elif self.difficulty_level == 3:
            return 'orange'
        elif self.difficulty_level == 4:
            return 'danger'
        else:
            return 'dark'
    
    def get_difficulty_text(self):
        """获取难度文本"""
        levels = {1: '简单', 2: '中等', 3: '有趣', 4: '挑战', 5: '专家'}
        return levels.get(self.difficulty_level, '未知')
    
    def __repr__(self):
        return f'<Scenario {self.title}>'

class ScenarioQuestion(db.Model):
    __tablename__ = 'scenario_questions'
    
    id = db.Column(db.Integer, primary_key=True)
    scenario_id = db.Column(db.Integer, db.ForeignKey('scenarios.id'), nullable=False)
    question_order = db.Column(db.Integer, nullable=False, comment='问题顺序')
    question_text = db.Column(db.Text, nullable=False, comment='问题文本')
    expected_response_type = db.Column(db.String(50), default='open', comment='期望回答类型')
    is_required = db.Column(db.Boolean, default=True, comment='是否必答')
    
    def __repr__(self):
        return f'<ScenarioQuestion {self.scenario_id}:{self.question_order}>'

class UserSession(db.Model):
    __tablename__ = 'user_sessions'
    
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    scenario_id = db.Column(db.Integer, db.ForeignKey('scenarios.id'), nullable=False)
    start_time = db.Column(db.DateTime, default=datetime.utcnow)
    end_time = db.Column(db.DateTime, nullable=True)
    duration = db.Column(db.Integer, nullable=True, comment='学习时长(秒)')
    completion_rate = db.Column(db.Numeric(5,2), default=0.00, comment='完成度百分比')
    total_questions = db.Column(db.Integer, default=0, comment='总问题数')
    answered_questions = db.Column(db.Integer, default=0, comment='已回答问题数')
    status = db.Column(db.Enum('ongoing', 'completed', 'interrupted', name='session_status'), default='ongoing')
    
    def __repr__(self):
        return f'<UserSession {self.user_id}:{self.scenario_id}>'

class UserProgress(db.Model):
    __tablename__ = 'user_progress'
    
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    scenario_id = db.Column(db.Integer, db.ForeignKey('scenarios.id'), nullable=False)
    completion_count = db.Column(db.Integer, default=0, comment='完成次数')
    best_score = db.Column(db.Numeric(4,2), nullable=True, comment='最佳得分')
    average_score = db.Column(db.Numeric(4,2), nullable=True, comment='平均得分')
    total_duration = db.Column(db.Integer, default=0, comment='总学习时长(秒)')
    last_completed_at = db.Column(db.DateTime, nullable=True, comment='最后完成时间')
    first_completed_at = db.Column(db.DateTime, nullable=True, comment='首次完成时间')
    
    __table_args__ = (db.UniqueConstraint('user_id', 'scenario_id', name='uk_user_scenario'),)
    
    def __repr__(self):
        return f'<UserProgress {self.user_id}:{self.scenario_id}>'