import os
from datetime import timedelta
from dotenv import load_dotenv

load_dotenv()

class Config:
    # Flask
    SECRET_KEY = os.getenv('SECRET_KEY', 'dev-secret-key-change-in-production')
    DEBUG = False
    TESTING = False
    
    # Database
    MYSQL_HOST = os.getenv('MYSQL_HOST', 'localhost')
    MYSQL_PORT = int(os.getenv('MYSQL_PORT', 3306))
    MYSQL_USER = os.getenv('MYSQL_USER', 'root')
    MYSQL_PASSWORD = os.getenv('MYSQL_PASSWORD', '')
    MYSQL_DATABASE = os.getenv('MYSQL_DATABASE', 'todo_system')
    
    SQLALCHEMY_DATABASE_URI = f"mysql+pymysql://{MYSQL_USER}:{MYSQL_PASSWORD}@{MYSQL_HOST}:{MYSQL_PORT}/{MYSQL_DATABASE}?charset=utf8mb4"
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    SQLALCHEMY_ECHO = False
    
    # Database Connection Pool Settings
    SQLALCHEMY_ENGINE_OPTIONS = {
        'pool_pre_ping': True,  # 每次使用前檢查連接
        'pool_recycle': 300,    # 5分鐘回收連接
        'pool_timeout': 20,     # 連接超時 20 秒
        'max_overflow': 10,     # 最大溢出連接數
        'pool_size': 5,         # 連接池大小
        'connect_args': {
            'connect_timeout': 10,     # MySQL 連接超時
            'read_timeout': 30,        # MySQL 讀取超時
            'write_timeout': 30,       # MySQL 寫入超時
            'charset': 'utf8mb4'
        }
    }
    
    # JWT
    JWT_SECRET_KEY = os.getenv('JWT_SECRET_KEY', SECRET_KEY)
    JWT_ACCESS_TOKEN_EXPIRES = timedelta(hours=int(os.getenv('JWT_ACCESS_TOKEN_EXPIRES_HOURS', 8)))
    JWT_REFRESH_TOKEN_EXPIRES = timedelta(days=int(os.getenv('JWT_REFRESH_TOKEN_EXPIRES_DAYS', 30)))
    JWT_ALGORITHM = 'HS256'
    
    # LDAP/AD
    LDAP_SERVER = os.getenv('LDAP_SERVER', 'ldap://dc.company.com')
    LDAP_PORT = int(os.getenv('LDAP_PORT', 389))
    LDAP_USE_SSL = os.getenv('LDAP_USE_SSL', 'false').lower() == 'true'
    LDAP_USE_TLS = os.getenv('LDAP_USE_TLS', 'false').lower() == 'true'
    LDAP_SEARCH_BASE = os.getenv('LDAP_SEARCH_BASE', 'DC=company,DC=com')
    LDAP_BIND_USER_DN = os.getenv('LDAP_BIND_USER_DN', '')
    LDAP_BIND_USER_PASSWORD = os.getenv('LDAP_BIND_USER_PASSWORD', '')
    LDAP_USER_LOGIN_ATTR = os.getenv('LDAP_USER_LOGIN_ATTR', 'userPrincipalName')
    
    # SMTP Email
    SMTP_SERVER = os.getenv('SMTP_SERVER', 'smtp.company.com')
    SMTP_PORT = int(os.getenv('SMTP_PORT', 25))
    SMTP_USE_TLS = os.getenv('SMTP_USE_TLS', 'false').lower() == 'true'
    SMTP_USE_SSL = os.getenv('SMTP_USE_SSL', 'false').lower() == 'true'
    SMTP_AUTH_REQUIRED = os.getenv('SMTP_AUTH_REQUIRED', 'false').lower() == 'true'
    SMTP_SENDER_EMAIL = os.getenv('SMTP_SENDER_EMAIL', 'todo-system@company.com')
    SMTP_SENDER_PASSWORD = os.getenv('SMTP_SENDER_PASSWORD', '')
    
    # Mail Settings
    MAIL_SERVER = SMTP_SERVER
    MAIL_PORT = SMTP_PORT
    MAIL_USE_TLS = SMTP_USE_TLS
    MAIL_USE_SSL = SMTP_USE_SSL
    MAIL_USERNAME = SMTP_SENDER_EMAIL if SMTP_AUTH_REQUIRED else None
    MAIL_PASSWORD = SMTP_SENDER_PASSWORD if SMTP_AUTH_REQUIRED else None
    MAIL_DEFAULT_SENDER = SMTP_SENDER_EMAIL
    
    # Fire Email Limits
    FIRE_EMAIL_COOLDOWN_MINUTES = int(os.getenv('FIRE_EMAIL_COOLDOWN_MINUTES', 2))
    FIRE_EMAIL_DAILY_LIMIT = int(os.getenv('FIRE_EMAIL_DAILY_LIMIT', 20))
    
    # Scheduled Reminders
    REMINDER_DAYS_BEFORE = int(os.getenv('REMINDER_DAYS_BEFORE', 3))
    REMINDER_DAYS_AFTER = int(os.getenv('REMINDER_DAYS_AFTER', 1))
    WEEKLY_SUMMARY_DAY = int(os.getenv('WEEKLY_SUMMARY_DAY', 0))  # 0=Monday
    WEEKLY_SUMMARY_HOUR = int(os.getenv('WEEKLY_SUMMARY_HOUR', 9))
    
    
    # File Upload
    MAX_CONTENT_LENGTH = int(os.getenv('MAX_CONTENT_LENGTH', 16)) * 1024 * 1024  # MB
    UPLOAD_FOLDER = os.getenv('UPLOAD_FOLDER', 'uploads')
    ALLOWED_EXTENSIONS = {'xlsx', 'xls', 'csv'}
    
    # Pagination
    ITEMS_PER_PAGE = int(os.getenv('ITEMS_PER_PAGE', 20))
    
    # Redis (for caching and celery)
    REDIS_URL = os.getenv('REDIS_URL', 'redis://localhost:6379/0')
    
    # Celery
    CELERY_BROKER_URL = REDIS_URL
    CELERY_RESULT_BACKEND = REDIS_URL
    
    # CORS
    CORS_ORIGINS = os.getenv('CORS_ORIGINS', 'http://localhost:3000').split(',')
    
    # Logging
    LOG_LEVEL = os.getenv('LOG_LEVEL', 'INFO')
    LOG_FILE = os.getenv('LOG_FILE', 'logs/app.log')

class DevelopmentConfig(Config):
    DEBUG = True
    SQLALCHEMY_ECHO = True
    
    # 開發模式可使用Mock LDAP
    USE_MOCK_LDAP = os.getenv('USE_MOCK_LDAP', 'true').lower() == 'true'

class ProductionConfig(Config):
    DEBUG = False
    TESTING = False

class TestingConfig(Config):
    TESTING = True
    SQLALCHEMY_DATABASE_URI = 'sqlite:///:memory:'
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    
    # 禁用外部服務
    CELERY_TASK_ALWAYS_EAGER = True
    CELERY_TASK_EAGER_PROPAGATES = True
    
    # 測試用的簡化設定
    JWT_ACCESS_TOKEN_EXPIRES = timedelta(hours=1)
    FIRE_EMAIL_COOLDOWN_MINUTES = 2
    FIRE_EMAIL_DAILY_LIMIT = 3
    
    # 禁用郵件發送
    MAIL_SUPPRESS_SEND = True

config = {
    'development': DevelopmentConfig,
    'production': ProductionConfig,
    'testing': TestingConfig,
    'default': DevelopmentConfig
}