from datetime import datetime
from werkzeug.security import generate_password_hash, check_password_hash
from extensions import db

# =======================
# 数据库 1: 业务数据 (devices.db)
# =======================

class Device(db.Model):
    __tablename__ = 'devices'
    # 默认数据库，无需 bind_key

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(100), unique=True, index=True)
    source = db.Column(db.String(50))

    # 快照字段（爬虫更新）
    status = db.Column(db.String(50))
    current_value = db.Column(db.String(200))
    latest_time = db.Column(db.String(50))
    json_data = db.Column(db.Text)
    check_time = db.Column(db.String(50))
    reason = db.Column(db.String(255))
    offset = db.Column(db.String(50))

    # 手动录入字段
    install_site = db.Column(db.String(100), default="")
    is_maintaining = db.Column(db.Boolean, default=False)
    is_hidden = db.Column(db.Boolean, default=False)

    def to_dict(self):
        api_status = 'offline' if self.status in ['离线', '异常', '已离线'] else 'online'
        return {
            'id': self.id,
            'name': self.name,
            'source': self.source,
            'latest_time': self.latest_time,
            'status': api_status,
            'status_text': self.status,
            'value': self.current_value,
            'reason': self.reason,
            'install_site': self.install_site or '',
            'is_maintaining': self.is_maintaining,
            'is_hidden': self.is_hidden,
            'offset': self.offset
        }

class DeviceHistory(db.Model):
    __tablename__ = 'device_history'

    id = db.Column(db.Integer, primary_key=True)
    device_id = db.Column(db.Integer, db.ForeignKey('devices.id'))

    data_time = db.Column(db.String(50))
    status = db.Column(db.String(50))
    result_data = db.Column(db.String(200), default="")
    json_data = db.Column(db.Text)
    file_path = db.Column(db.String(255))
    recorded_at = db.Column(db.DateTime, default=datetime.now)

class MaintenanceLog(db.Model):
    __tablename__ = 'maintenance_logs'
    id = db.Column(db.Integer, primary_key=True)
    device_name = db.Column(db.String(100), nullable=False)
    engineer = db.Column(db.String(50))
    location = db.Column(db.String(100))
    content = db.Column(db.Text)
    timestamp = db.Column(db.DateTime, default=datetime.now)

    def to_dict(self):
        return {
            'id': self.id,
            'device_name': self.device_name,
            'engineer': self.engineer or '',
            'location': self.location or '',
            'content': self.content,
            'timestamp': self.timestamp.strftime('%Y-%m-%d %H:%M:%S')
        }

# =======================
# 数据库 2: 用户管理 (users.db)
# =======================

class User(db.Model):
    __bind_key__ = 'users_db'  # 关键：指定存储在 users.db
    __tablename__ = 'users'

    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    password_hash = db.Column(db.String(128))
    role = db.Column(db.String(20), default='client') # 'admin' or 'client'
    created_at = db.Column(db.DateTime, default=datetime.now)

    def set_password(self, password):
        self.password_hash = generate_password_hash(password)

    def check_password(self, password):
        return check_password_hash(self.password_hash, password)

class UserDevicePermission(db.Model):
    """
    关联表：存储用户ID和设备ID的对应关系。
    注意：因为跨数据库，这里不能使用 ForeignKey 约束指向 Device 表。
    我们只存储纯整数 ID (device_id)，逻辑关联在 api.py 中处理。
    """
    __bind_key__ = 'users_db'
    __tablename__ = 'user_device_permissions'

    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    device_id = db.Column(db.Integer, nullable=False) # 对应 devices.db 中的 Device.id