"""
Flask应用工厂
"""
from flask import Flask
from flask_mail import Mail
from config.config import Config
from config.database import db
import re

# 初始化邮件服务
mail = Mail()


def create_app(config_name='default'):
    app = Flask(__name__)

    # 加载配置
    app.config.from_object(Config)

    # 初始化数据库
    db.init_app(app)

    # 初始化邮件服务
    mail.init_app(app)

    # 注册自定义过滤器
    register_filters(app)

    # 注册蓝图
    register_blueprints(app)

    # 创建数据库表
    with app.app_context():
        try:
            db.create_all()
            print("✅ 数据库表创建/同步成功")
        except Exception as e:
            print(f"❌ 数据库表创建失败: {str(e)}")

    return app


def register_filters(app):
    """注册自定义过滤器"""

    @app.template_filter('nl2br')
    def nl2br_filter(text):
        """将换行符转换为HTML <br> 标签"""
        if not text:
            return ''
        # 将换行符替换为 <br> 标签
        return text.replace('\n', '<br>')

    @app.template_filter('truncate_chars')
    def truncate_chars_filter(text, length=50):
        """截断字符串"""
        if not text:
            return ''
        if len(text) <= length:
            return text
        return text[:length] + '...'


def register_blueprints(app):
    """注册蓝图"""
    from app.views.main import main_bp
    from app.views.auth import auth_bp
    from app.views.user import user_bp
    from app.views.admin import admin_bp
    from app.views.product import product_bp
    from app.views.cart import cart_bp
    from app.views.address import address_bp
    from app.views.order import order_bp
    from app.views.payment import payment_bp

    app.register_blueprint(main_bp)
    app.register_blueprint(auth_bp)
    app.register_blueprint(user_bp)
    app.register_blueprint(admin_bp)
    app.register_blueprint(product_bp)
    app.register_blueprint(cart_bp)
    app.register_blueprint(address_bp)
    app.register_blueprint(order_bp)
    app.register_blueprint(payment_bp)

    # 修复：正确注册upload蓝图并设置URL前缀
    try:
        from app.views.upload import upload_bp
        app.register_blueprint(upload_bp, url_prefix='/upload')  # 添加URL前缀
        print("✅ 上传功能蓝图注册成功")
    except ImportError as e:
        print(f"⚠️ 上传功能暂时不可用: {str(e)}")

    print("✅ 商品管理蓝图注册成功")
    print("✅ 购物车蓝图注册成功")