"""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
import sys
import logging
from logging.handlers import RotatingFileHandler

# 将 api/ 目录加入搜索路径，使 `from insurance.xxx` 可从任意位置运行
_this_dir = os.path.dirname(os.path.abspath(__file__))
_api_dir = os.path.dirname(_this_dir)
if _api_dir not in sys.path:
    sys.path.insert(0, _api_dir)

from flask import Flask
from flask_cors import CORS
from dotenv import load_dotenv

# 加载环境变量，.env.local 优先级最高（本地开发用，不影响 Docker 部署）
_project_root = os.path.dirname(_api_dir)  # baodanagent/
load_dotenv(os.path.join(_project_root, '.env.local'), override=True)
load_dotenv(os.path.join(_project_root, '.env'))
load_dotenv()


def setup_logging(app: Flask) -> None:
    """配置统一的日志系统。"""
    log_level = app.config.get('LOG_LEVEL', 'INFO')
    log_file = app.config.get('LOG_FILE', 'logs/insurance.log')

    # 创建日志目录
    log_dir = os.path.dirname(log_file)
    if log_dir and not os.path.exists(log_dir):
        os.makedirs(log_dir, exist_ok=True)

    # 配置根日志记录器
    root_logger = logging.getLogger()
    root_logger.setLevel(getattr(logging, log_level.upper(), logging.INFO))

    # 控制台输出
    console_handler = logging.StreamHandler()
    console_handler.setLevel(logging.INFO)
    console_format = logging.Formatter(
        '%(asctime)s [%(levelname)s] %(name)s: %(message)s',
        datefmt='%Y-%m-%d %H:%M:%S'
    )
    console_handler.setFormatter(console_format)
    root_logger.addHandler(console_handler)

    # 文件输出（带轮转）
    try:
        file_handler = RotatingFileHandler(
            log_file,
            maxBytes=10 * 1024 * 1024,  # 10MB
            backupCount=5,
            encoding='utf-8'
        )
        file_handler.setLevel(logging.DEBUG)
        file_format = logging.Formatter(
            '%(asctime)s [%(levelname)s] %(name)s [%(filename)s:%(lineno)d]: %(message)s',
            datefmt='%Y-%m-%d %H:%M:%S'
        )
        file_handler.setFormatter(file_format)
        root_logger.addHandler(file_handler)
    except Exception as e:
        print(f"[logging] 文件日志配置失败: {e}")

    # 将 print 替换为 logging
    import builtins
    original_print = builtins.print
    def logging_print(*args, **kwargs):
        msg = ' '.join(str(arg) for arg in args)
        logging.info(msg)
    builtins.print = logging_print


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')

    # 配置日志
    setup_logging(app)

    # 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（检查实际依赖）
    @app.route('/health')
    def health():
        checks = {'status': 'ok', 'service': 'baodanagent-api'}
        try:
            from insurance.db.compat import db
            db.session.execute(db.text('SELECT 1'))
            checks['database'] = 'ok'
        except Exception as e:
            checks['database'] = f'error: {str(e)[:100]}'
            checks['status'] = 'degraded'
        try:
            from insurance.db.compat import redis_client
            if redis_client:
                redis_client.ping()
                checks['redis'] = 'ok'
            else:
                checks['redis'] = 'not configured'
        except Exception as e:
            checks['redis'] = f'error: {str(e)[:100]}'
            checks['status'] = 'degraded'
        return checks

    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)