from flask import Blueprint, request, jsonify
from flask_jwt_extended import create_access_token, jwt_required, get_jwt_identity
from datetime import timedelta
from ..models import User, SystemSettings, db

auth_bp = Blueprint('auth', __name__)


@auth_bp.route('/register', methods=['POST'])
def register():
    # 检查是否允许注册
    allow_registration = SystemSettings.get_value('allow_registration', True)
    if not allow_registration:
        return jsonify({'message': '当前不允许新用户注册'}), 403

    data = request.get_json()

    # 验证必要字段
    if not all(k in data for k in ('username', 'email', 'password')):
        return jsonify({'message': '缺少必要字段'}), 400

    # 检查用户名和邮箱是否已存在
    if User.query.filter_by(username=data['username']).first():
        return jsonify({'message': '用户名已存在'}), 400

    if User.query.filter_by(email=data['email']).first():
        return jsonify({'message': '邮箱已被注册'}), 400

    # 获取默认每日配额
    daily_quota = SystemSettings.get_value('daily_quota', 5)
    require_admin_approval = SystemSettings.get_value('require_admin_approval', True)

    # 创建新用户
    user = User(
        username=data['username'],
        email=data['email'],
        daily_quota=daily_quota,
        is_active=not require_admin_approval  # 根据设置决定是否需要管理员激活
    )
    user.set_password(data['password'])

    db.session.add(user)
    db.session.commit()

    if require_admin_approval:
        return jsonify({'message': '注册成功，请等待管理员激活'}), 201
    else:
        return jsonify({'message': '注册成功'}), 201


@auth_bp.route('/login', methods=['POST'])
def login():
    data = request.get_json()

    if not all(k in data for k in ('username', 'password')):
        return jsonify({'message': '缺少用户名或密码'}), 400

    user = User.query.filter_by(username=data['username']).first()

    if not user or not user.check_password(data['password']):
        return jsonify({'message': '用户名或密码错误'}), 401

    if not user.is_active:
        return jsonify({'message': '账号未激活，请联系管理员'}), 403

    # 创建访问令牌，有效期1天
    access_token = create_access_token(
        identity=str(user.id),
        additional_claims={'is_admin': user.is_admin},
        expires_delta=timedelta(days=1)
    )

    return jsonify({
        'access_token': access_token,
        'user': user.to_dict()
    }), 200


@auth_bp.route('/me', methods=['GET'])
@jwt_required()
def get_current_user():
    user_id = get_jwt_identity()
    user = User.query.get_or_404(user_id)
    return jsonify(user.to_dict()), 200


@auth_bp.route('/reset-password', methods=['POST'])
@jwt_required()
def reset_password():
    user_id = get_jwt_identity()
    user = User.query.get_or_404(user_id)

    data = request.get_json()
    if not all(k in data for k in ('old_password', 'new_password')):
        return jsonify({'message': '缺少必要字段'}), 400

    if not user.check_password(data['old_password']):
        return jsonify({'message': '原密码错误'}), 401

    user.set_password(data['new_password'])
    db.session.commit()

    return jsonify({'message': '密码重置成功'}), 200


@auth_bp.route('/health', methods=['GET'])
def health_check():
    """健康检查端点，用于Docker容器监控"""
    try:
        # 检查数据库连接
        db.session.execute('SELECT 1')
        return jsonify({
            'status': 'healthy',
            'service': 'filesend-backend',
            'database': 'connected'
        }), 200
    except Exception as e:
        return jsonify({
            'status': 'unhealthy',
            'service': 'filesend-backend',
            'database': 'disconnected',
            'error': str(e)
        }), 503