"""保单智能客服系统 — 独立后端入口

独立部署时使用的 Flask 应用，不依赖 Dify 扩展。
"""
import os
from flask import Flask
from flask_cors import CORS
from dotenv import load_dotenv

# 加载环境变量
load_dotenv()


def create_app() -> Flask:
    """创建 Flask 应用。"""
    app = Flask(__name__)

    # 配置
    app.config['SECRET_KEY'] = os.getenv('JWT_SECRET', 'baodan-jwt-secret-2026')
    app.config['JWT_SECRET'] = os.getenv('JWT_SECRET', 'baodan-jwt-secret-2026')
    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
    app.config['REDIS_URL'] = os.getenv('REDIS_URL')

    # 数据库：优先 DATABASE_URL，其次 DB_* 变量构建 PostgreSQL URL，最后回退到 SQLite
    db_url = os.getenv('DATABASE_URL', '')
    if not db_url:
        # 从 DB_* 环境变量构建 PostgreSQL URL
        db_host = os.getenv('DB_HOST', '')
        db_port = os.getenv('DB_PORT', '5432')
        db_user = os.getenv('DB_USERNAME', '')
        db_pass = os.getenv('DB_PASSWORD', '')
        db_name = os.getenv('DB_DATABASE', '')
        if db_host and db_user and db_name:
            db_url = f"postgresql://{db_user}:{db_pass}@{db_host}:{db_port}/{db_name}"
    if db_url and 'postgresql' in db_url:
        # 检查 psycopg2 是否可用
        try:
            import psycopg2
            app.config['SQLALCHEMY_DATABASE_URI'] = db_url
        except ImportError:
            print("[warning] psycopg2 未安装，回退到 SQLite")
            app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///baodan.db'
    else:
        app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///baodan.db'
    app.config['MIGRATION_ENABLED'] = True

    # Dify 配置
    app.config['BAODAN_API_URL'] = os.getenv('DIFY_BASE_URL', 'http://localhost:5001')
    app.config['BAODAN_CHAT_API_KEY'] = os.getenv('DIFY_CHAT_APP_API_KEY', '')
    app.config['BAODAN_WORKFLOW_API_KEY'] = os.getenv('DIFY_WORKFLOW_APP_API_KEY', '')

    # 企业微信配置
    app.config['WECOM_CORP_ID'] = os.getenv('WECOM_CORP_ID', '')
    app.config['WECOM_SECRET'] = os.getenv('WECOM_SECRET', '')
    app.config['WECOM_TOKEN'] = os.getenv('WECOM_TOKEN', '')
    app.config['WECOM_AES_KEY'] = os.getenv('WECOM_AES_KEY', '')
    app.config['WECOM_WEBHOOK_URL'] = os.getenv('WECOM_WEBHOOK_URL', '')

    # 访客模式
    app.config['GUEST_MODE'] = os.getenv('GUEST_MODE', 'true').lower() == 'true'

    # 域名（分享链接用）
    app.config['DOMAIN'] = os.getenv('DOMAIN', 'localhost')

    # CORS
    CORS(app, resources={r"/*": {"origins": "*"}})

    # 初始化数据库
    from insurance.db.database import init_db
    init_db(app)

    # 初始化 Redis
    from insurance.db.redis import init_redis
    init_redis(app)

    # 注册路由
    from insurance.routes import register_insurance_routes
    register_insurance_routes(app)

    # 注册错误处理器
    from insurance.utils.error_handler import register_error_handlers
    register_error_handlers(app)

    # 健康检查
    @app.route('/health')
    def health():
        return {'status': 'ok', 'service': 'baodanagent-api'}

    return app


# 创建应用实例
app = create_app()

if __name__ == '__main__':
    port = int(os.getenv('PORT', 5001))
    debug = os.getenv('FLASK_DEBUG', 'false').lower() == 'true'
    app.run(host='0.0.0.0', port=port, debug=debug)