// Preload .env before any module imports
import * as dotenv from 'dotenv';
dotenv.config({ path: ['.env', '.env.local'] });

import { Module } from '@nestjs/common';
import { ConfigModule, ConfigService } from '@nestjs/config';
import { TypeOrmModule } from '@nestjs/typeorm';
import { ThrottlerGuard, ThrottlerModule } from '@nestjs/throttler';
import { APP_GUARD, APP_INTERCEPTOR } from '@nestjs/core';

import { appConfig } from './config/app.config';
import { databaseConfig } from './config/database.config';
import { redisConfig } from './config/redis.config';
import { rateLimitConfig } from './config/rate-limit.config';

import { JwtAuthGuard } from './common/guards/jwt-auth.guard';

import { TenantsModule } from './modules/tenants/tenants.module';
import { AuthModule } from './modules/auth/auth.module';
import { TgAccountsModule } from './modules/tg-accounts/tg-accounts.module';
import { TgAuthModule } from './modules/tg-auth/tg-auth.module';
import { TgProxiesModule } from './modules/tg-proxies/tg-proxies.module';
import { TdlibModule } from './modules/tdlib/tdlib.module';
import { TgChatsModule } from './modules/tg-chats/tg-chats.module';
import { TgDialogsModule } from './modules/tg-dialogs/tg-dialogs.module';
import { TgContactsModule } from './modules/tg-contacts/tg-contacts.module';
import { TgMessagesModule } from './modules/tg-messages/tg-messages.module';
import { TgGroupsModule } from './modules/tg-groups/tg-groups.module';
import { TgChannelsModule } from './modules/tg-channels/tg-channels.module';
import { TgFilesModule } from './modules/tg-files/tg-files.module';
import { TgWebhooksModule } from './modules/tg-webhooks/tg-webhooks.module';
import { TgRateLimitModule } from './modules/tg-rate-limit/tg-rate-limit.module';
import { TgAuditModule } from './modules/tg-audit/tg-audit.module';
import { AdminModule } from './modules/admin/admin.module';
import { TgUpdatesModule } from './modules/tg-updates/tg-updates.module';
import { AuditLogInterceptor } from './common/interceptors/audit-log.interceptor';

// Conditionally import BullMQ
const redisEnabled = process.env.REDIS_ENABLED !== 'false';
const bullImports: any[] = [];
const bullProviders: any[] = [];

if (redisEnabled) {
  const { BullModule } = require('@nestjs/bull');
  bullImports.push(
    BullModule.forRootAsync({
      imports: [ConfigModule],
      inject: [ConfigService],
      useFactory: (config: ConfigService) => ({
        redis: {
          host: config.get('redis.host'),
          port: config.get('redis.port'),
          password: config.get('redis.password'),
          db: config.get('redis.db'),
        },
      }),
    }),
  );
} else {
  // Provide mock Bull queue tokens so injectors don't crash
  const { getQueueToken } = require('@nestjs/bull');
  const queueNames = ['send-message', 'file-download', 'webhook-delivery'];
  for (const name of queueNames) {
    bullProviders.push({
      provide: getQueueToken(name),
      useValue: { add: () => Promise.reject(new Error('Redis/BullMQ not available')), process: () => {} },
    });
    bullProviders.push({
      provide: 'BullQueue_' + name,
      useValue: { add: () => Promise.reject(new Error('Redis/BullMQ not available')), process: () => {} },
    });
  }
}

const imports: any[] = [
  ConfigModule.forRoot({
    isGlobal: true,
    load: [appConfig, databaseConfig, redisConfig, rateLimitConfig],
    envFilePath: ['.env'],
  }),
  TypeOrmModule.forRootAsync({
    imports: [ConfigModule],
    inject: [ConfigService],
    useFactory: (config: ConfigService) => {
      const dbType = config.get('database.type') || 'postgres';
      if (dbType === 'sqlite') {
        const sqlitePath = config.get('database.sqlitePath') || 'data/gateway.sqlite';
        const inMemory = sqlitePath === ':memory:';
        return {
          type: 'sqljs',
          ...(inMemory ? {} : { location: sqlitePath }),
          autoSave: !inMemory,
          entities: [__dirname + '/database/entities/**/*.entity.{ts,js}'],
          synchronize: true,
        };
      }
      return {
        type: 'postgres',
        host: config.get('database.host'),
        port: config.get('database.port'),
        username: config.get('database.username'),
        password: config.get('database.password'),
        database: config.get('database.database'),
        entities: [__dirname + '/database/entities/**/*.entity.{ts,js}'],
        synchronize:
          config.get('database.synchronize') ||
          config.get('app.nodeEnv') === 'development',
        migrationsRun: config.get('database.migrationsRun') || false,
        migrations: [__dirname + '/database/migrations/*.{ts,js}'],
        logging: config.get('app.nodeEnv') === 'development',
      };
    },
  }),
  ...bullImports,
  ThrottlerModule.forRootAsync({
    imports: [ConfigModule],
    inject: [ConfigService],
    useFactory: (config: ConfigService) => ({
      throttlers: [
        {
          ttl: config.get('rateLimit.defaultTtl') || 60000,
          limit: config.get('rateLimit.defaultLimit') || 30,
        },
      ],
    }),
  }),
  TenantsModule,
  AuthModule,
  TgAccountsModule,
  TgAuthModule,
  TgProxiesModule,
  TdlibModule,
  TgChatsModule,
  TgDialogsModule,
  TgContactsModule,
  TgMessagesModule,
  TgGroupsModule,
  TgChannelsModule,
  TgFilesModule,
  TgWebhooksModule,
  TgRateLimitModule,
  TgAuditModule,
  AdminModule,
  TgUpdatesModule,
];

@Module({
  imports,
  providers: [
    {
      provide: APP_GUARD,
      useClass: JwtAuthGuard,
    },
    {
      provide: APP_GUARD,
      useClass: ThrottlerGuard,
    },
    {
      provide: APP_INTERCEPTOR,
      useClass: AuditLogInterceptor,
    },
    ...bullProviders,
  ],
})
export class AppModule {}