import dotenv from 'dotenv';
import path from 'path';
import * as yup from 'yup';

dotenv.config({ path: path.join(__dirname, '../../.env') });

const envVarsSchema = yup
	.object()
	.shape({
		NODE_ENV: yup
			.string()
			.oneOf(['production', 'development', 'test'])
			.required(),
		PORT: yup.number().default(3000),
		BASEURL: yup.string().required('Base URL is required'),
		// FRONTEND_URL: yup.string().required('Frontend URL is required'),
		//JWT
		JWT_SECRET: yup.string().required('JWT secret key is required'),
		JWT_ACCESS_EXPIRATION_MINUTES: yup
			.number()
			.default(30)
			.required('minutes after which access tokens expire'),
		JWT_REFRESH_EXPIRATION_DAYS: yup
			.number()
			.default(30)
			.required('days after which refresh tokens expire'),
		JWT_RESET_PASSWORD_EXPIRATION_MINUTES: yup
			.number()
			.default(10)
			.required('minutes after which reset password token expires'),
		JWT_VERIFY_EMAIL_EXPIRATION_MINUTES: yup
			.number()
			.default(10)
			.required('minutes after which verify email token expires'),
		//SMTP and BREVO
		// BREVO_SMTP_HOST: yup
		// 	.string()
		// 	.nullable()
		// 	.required('server that will send the emails'),
		// BREVO_SMTP_PORT: yup
		// 	.number()
		// 	.nullable()
		// 	.required('port to connect to the email server'),
		// BREVO_SMTP_USER: yup
		// 	.string()
		// 	.nullable()
		// 	.required('username for email server'),
		// BREVO_SMTP_PASS: yup
		// 	.string()
		// 	.nullable()
		// 	.required('password for email server'),
		// BREVO_FROM_EMAIL: yup
		// 	.string()
		// 	.nullable()
		// 	.required('the from field in the emails sent by the app'),
		// BREVO_EMAIL_API_KEY: yup
		// 	.string()
		// 	.nullable()
		// 	.required('the from field in the emails sent by the app api key'),
		// BREVO_API_BASEURL: yup.string().required('Brevo base URL is required'),
		// //one signal
		// ONESIGNAL_APPID: yup.string().required('One signal app id is required'),
		// ONESIGNAL_REST_APIKEY: yup
		// 	.string()
		// 	.required('One signal api key is required'),
		//branch IO
		// BRANCH_IO_KEY: yup.string().required('Branch IO key is required'),

		// DataBase
		DB_USERNAME: yup.string().required('DB Username is required'),
		DB_PASSWORD: yup.string().required('DB Password is required'),
		DB_DATABASE_NAME: yup.string().required('Database name is required'),
		DB_HOSTNAME: yup
			.string()
			.default('127.0.0.1')
			.required('DB Hostname is required'),
		DB_PORT: yup.number().default(3306).required('DB Port is required'),
		//OTP Bypass
		BYPASS_OTP: yup.boolean().default(false).required('Bypass OTP is required'),
	})
	.noUnknown(true);

// Validate and prepare the configuration
function getConfig() {
	try {
		// Validate the environment variables
		const envVars = envVarsSchema.validateSync(process.env, {
			abortEarly: false, // Validate all fields before throwing errors
			stripUnknown: true, // Remove fields not in the schema
		});

		// Return the validated configuration
		return {
			env: envVars.NODE_ENV,
			port: envVars.PORT,
			jwt: {
				secret: envVars.JWT_SECRET,
				accessExpirationMinutes: envVars.JWT_ACCESS_EXPIRATION_MINUTES,
				refreshExpirationDays: envVars.JWT_REFRESH_EXPIRATION_DAYS,
				resetPasswordExpirationMinutes:
					envVars.JWT_RESET_PASSWORD_EXPIRATION_MINUTES,
				verifyEmailExpirationMinutes:
					envVars.JWT_VERIFY_EMAIL_EXPIRATION_MINUTES,
			},
			database: {
				development: {
					host: envVars.DB_HOSTNAME,
					port: envVars.DB_PORT,
					username: envVars.DB_USERNAME,
					password: envVars.DB_PASSWORD,
					database: envVars.DB_DATABASE_NAME,
					logging: false,
				},
				test: {
					host: envVars.DB_HOSTNAME,
					port: envVars.DB_PORT,
					username: envVars.DB_USERNAME,
					password: envVars.DB_PASSWORD,
					database: envVars.DB_DATABASE_NAME,
					logging: false,
					socketPath: '/var/run/mysqld/mysqld.sock',
				},
				production: {
					host: envVars.DB_HOSTNAME,
					port: envVars.DB_PORT,
					username: envVars.DB_USERNAME,
					password: envVars.DB_PASSWORD,
					database: envVars.DB_DATABASE_NAME,
					logging: false,
					socketPath: '/var/run/mysqld/mysqld.sock',
				},
			},
			byPassOTP: envVars.BYPASS_OTP,
			// BaseURL: envVars.BASEURL,
			// FRONTEND_URL: envVars.FRONTEND_URL,
			// email: {
			// 	smtp: {
			// 		host: envVars?.BREVO_SMTP_HOST,
			// 		port: envVars?.BREVO_SMTP_PORT,
			// 		secure: envVars?.BREVO_SMTP_PORT == 465, // true for 465, false for other ports
			// 		auth: {
			// 			user: envVars?.BREVO_SMTP_USER,
			// 			pass: envVars?.BREVO_SMTP_PASS,
			// 		},
			// 	},
			// 	from: envVars?.BREVO_FROM_EMAIL,
			// 	api_key: envVars?.BREVO_EMAIL_API_KEY,
			// 	BrevobaseURL: envVars?.BREVO_API_BASEURL,
			// },
			// oneSignal: {
			// 	appID: envVars.ONESIGNAL_APPID,
			// 	restApiKey: envVars.ONESIGNAL_REST_APIKEY,
			// },
			// branchIO: {
			// 	branchIOKey: envVars.BRANCH_IO_KEY,
			// },
		};
	} catch (error: unknown) {
		if (error instanceof yup.ValidationError) {
			console.error('Validation Errors:', error.errors.join(', '));
		} else {
			console.error('Unexpected error during configuration validation:', error);
		}

		console.error(
			'Server shut down due to incomplete environment variable configuration.'
		);
		process.exit(1); // Exit with error code 1
	}
}

/**
 * Created By : Angad Chauhan
 * Created at : 31/1/25
 * Use : For google login .env file global variable
 */
// export const googleConfig = {
//         clientID: process.env.GOOGLE_CLIENT_ID!,
//         clientSecret: process.env.GOOGLE_CLIENT_SECRET!,
//         callbackURL: process.env.GOOGLE_CALLBACK_URL!,
// };

// Validate and export configuration only if validation succeeds
const config = getConfig();
export default config;