#environment-setup：Python 虚拟环境管理、pip install flask 与首个规范 App

# app/extensions.py
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager
from flask_migrate import Migrate
from flask_wtf.csrf import CSRFProtect

# 实例化所有扩展（不带app参数）
db = SQLAlchemy()
login_manager = LoginManager()
migrate = Migrate()
csrf = CSRFProtect()

# 配置 login_manager
login_manager.login_view = "auth.login"  # 未登录用户自动跳转到登录页
login_manager.login_message = "请先登录后再访问该页面哦~"
login_manager.login_message_category = "info"  # 消息提示的样式类（Bootstrap用）

# app/__init__.py
from flask import Flask
from config import config
from app.extensions import db, login_manager, migrate, csrf

def create_app(config_name="development"):
    # 1. 创建 Flask 实例
    app = Flask(__name__)

    # 2. 加载对应环境的配置
    app.config.from_object(config[config_name])

    # 3. 绑定扩展到当前 app
    db.init_app(app)
    login_manager.init_app(app)
    migrate.init_app(app, db)
    csrf.init_app(app)

    # 4. 注册 Blueprint（路由拆分）
    from app.routes.main import main_bp
    from app.routes.auth import auth_bp
    app.register_blueprint(main_bp)
    app.register_blueprint(auth_bp, url_prefix="/auth")  # 加前缀避免路由冲突

    # 5. （可选）添加简单的错误处理

    # 6. 返回配置好的 app 实例
    return app

# config.py
import os
from dotenv import load_dotenv

# 加载项目根目录的 .env 文件
load_dotenv()

class BaseConfig:
    """基础配置（所有环境共用）"""
    SECRET_KEY = os.getenv("SECRET_KEY", "dev-secret-key-123-CHANGE-ME-IN-PRODUCTION")
    SQLALCHEMY_TRACK_MODIFICATIONS = False  # 关闭不必要的数据库修改追踪
    UPLOAD_FOLDER = os.path.join(os.path.dirname(__file__), "app/static/uploads")

class DevelopmentConfig(BaseConfig):
    """开发环境配置"""
    DEBUG = True
    SQLALCHEMY_DATABASE_URI = os.getenv("DEV_DATABASE_URL", "sqlite:///daoman_dev.db")

class ProductionConfig(BaseConfig):
    """生产环境配置"""
    DEBUG = False
    SQLALCHEMY_DATABASE_URI = os.getenv("PROD_DATABASE_URL", "postgresql://user:pass@localhost/daoman_prod")

class TestingConfig(BaseConfig):
    """测试环境配置"""
    TESTING = True
    SQLALCHEMY_DATABASE_URI = "sqlite:///:memory:"  # 内存数据库，测试完自动清空
    WTF_CSRF_ENABLED = False  # 测试时关闭 CSRF 验证

# 配置字典，供 create_app() 调用
config = {
    "development": DevelopmentConfig,
    "production": ProductionConfig,
    "testing": TestingConfig,
    "default": DevelopmentConfig,
}

# run.py
import os
from app import create_app

# 从环境变量读取配置名，默认用开发环境
config_name = os.getenv("FLASK_ENV", "development")
app = create_app(config_name)

if __name__ == "__main__":
    app.run(
        host="127.0.0.1",  # 本地访问
        port=5000,
        debug=config[config_name].DEBUG,  # 同步环境的DEBUG配置
    )