export interface DatabaseConfig {
  host: string;
  port: number;
  username: string;
  password: string;
  database: string;
  dialect: 'mysql' | 'postgres' | 'sqlite' | 'mariadb' | 'mongodb';
  logging: boolean;
  pool?: {
    max: number;
    min: number;
    acquire: number;
    idle: number;
  };
  // MongoDB specific options
  mongodb?: {
    useNewUrlParser?: boolean;
    useUnifiedTopology?: boolean;
    retryWrites?: boolean;
    w?: string | number;
    readPreference?: string;
    maxPoolSize?: number;
    minPoolSize?: number;
    maxIdleTimeMS?: number;
    serverSelectionTimeoutMS?: number;
    socketTimeoutMS?: number;
    connectTimeoutMS?: number;
  };
}

export interface AuthConfig {
  jwtSecret: string;
  jwtExpiresIn: string;
  refreshTokenExpiresIn: string;
  providers: {
    internal: boolean;
    firebase: FirebaseAuthConfig;
    oauth: OAuthConfig;
    sms: SMSAuthConfig;
    email: EmailAuthConfig;
  };
}

export interface FirebaseAuthConfig {
  enabled: boolean;
  projectId: string;
  privateKeyId: string;
  privateKey: string;
  clientEmail: string;
  clientId: string;
  authUri: string;
  tokenUri: string;
  authProviderX509CertUrl: string;
  clientX509CertUrl: string;
}

export interface OAuthConfig {
  enabled: boolean;
  providers: {
    google: OAuthProviderConfig;
    github: OAuthProviderConfig;
    facebook: OAuthProviderConfig;
  };
}

export interface OAuthProviderConfig {
  enabled: boolean;
  clientId: string;
  clientSecret: string;
  callbackUrl: string;
  scope: string[];
}

export interface SMSAuthConfig {
  enabled: boolean;
  provider: 'twilio' | 'aws-sns' | 'custom';
  twilio?: {
    accountSid: string;
    authToken: string;
    fromNumber: string;
  };
  aws?: {
    accessKeyId: string;
    secretAccessKey: string;
    region: string;
  };
  custom?: {
    endpoint: string;
    apiKey: string;
  };
}

export interface EmailAuthConfig {
  enabled: boolean;
  provider: 'nodemailer' | 'sendgrid' | 'aws-ses' | 'custom';
  nodemailer?: {
    host: string;
    port: number;
    secure: boolean;
    auth: {
      user: string;
      pass: string;
    };
  };
  sendgrid?: {
    apiKey: string;
  };
  aws?: {
    accessKeyId: string;
    secretAccessKey: string;
    region: string;
  };
  custom?: {
    endpoint: string;
    apiKey: string;
  };
}

export interface NotificationConfig {
  email: EmailConfig;
  sms: SMSConfig;
  push: PushConfig;
}

export interface EmailConfig {
  enabled: boolean;
  provider: 'nodemailer' | 'sendgrid' | 'aws-ses';
  templates: {
    path: string;
    engine: 'handlebars' | 'ejs' | 'pug';
  };
  defaults: {
    from: string;
    replyTo: string;
  };
}

export interface SMSConfig {
  enabled: boolean;
  provider: 'twilio' | 'aws-sns' | 'custom';
  defaults: {
    from: string;
  };
}

export interface PushConfig {
  enabled: boolean;
  provider: 'firebase' | 'aws-sns' | 'custom';
}

export interface PluginConfig {
  name: string;
  version: string;
  enabled: boolean;
  config: Record<string, any>;
}

export interface AppConfig {
  environment: 'development' | 'staging' | 'production' | 'uat';
  port: number;
  host: string;
  cors: {
    origin: string | string[];
    credentials: boolean;
  };
  database: DatabaseConfig;
  auth: AuthConfig;
  notifications: NotificationConfig;
  plugins: PluginConfig[];
  logging: {
    level: 'error' | 'warn' | 'info' | 'debug';
    file?: string;
  };
  security: {
    rateLimit: {
      windowMs: number;
      max: number;
    };
    helmet: boolean;
    compression: boolean;
  };
}

export interface ConfigValidationResult {
  isValid: boolean;
  errors: string[];
  warnings: string[];
}