import * as toml from 'toml';
import { resolve } from 'path';
import { readFile } from 'fs/promises';
import { Configuration } from './config.interfaces';
import { Provider } from '@nestjs/common';

const CONFIG_ENV = process.env.NODE_ENV === 'production' ? 'prod' : 'dev';
const CONFIG_FILENAME = process.env.CONFIG || `config.${CONFIG_ENV}.toml`;

export const configProviders: Provider<any>[] = [
  {
    provide: 'CONFIG_PATH',
    useValue: resolve(__dirname, '..', '..', '..', CONFIG_FILENAME),
  },
  {
    provide: 'DEFAULT_CONFIG',
    useValue: {
      app: {
        base_url: 'http://localhost:3000',
        session_secret: 'change me!',
        challenge_secret: 'change me!',
      },
      email: {
        from: 'no-reply@localhost',
        smtp: {
          host: 'localhost',
          port: 587,
          secure: false,
          auth: {
            user: 'root',
            pass: 'root',
          },
        },
      },
      jwt: {
        algorithm: 'RS256',
        issuer: 'localhost',
        expiration: 3600,
      },
    } as Configuration,
  },
  {
    provide: 'CONFIGURATION',
    useFactory: async (
      path: string,
      def: Configuration,
    ): Promise<Configuration> => {
      try {
        const file = await readFile(path, { encoding: 'utf-8' });
        return {
          ...def,
          ...JSON.parse(JSON.stringify(toml.parse(file))),
        };
      } catch (e: any) {
        console.error('Failed to load configuration:', e.message);
        return def;
      }
    },
    inject: ['CONFIG_PATH', 'DEFAULT_CONFIG'],
  },
];