import { Module, Global, Logger } from '@nestjs/common';
import { ConfigModule, ConfigService } from '@nestjs/config';
import { TypeOrmModule } from '@nestjs/typeorm';
import * as fs from 'fs';
import * as path from 'path';
import { UserEntity } from './entities/user.entity';
import { SettingEntity } from './entities/setting.entity';
import { CategoryEntity } from './entities/category.entity';
import { ChallengeEntity } from './entities/challenge.entity';
import { ChallengeFileEntity } from './entities/challenge-file.entity';
import { SolveEntity } from './entities/solve.entity';
import { RefreshTokenEntity } from './entities/refresh-token.entity';
import { BlogPostEntity } from './entities/blog-post.entity';
import { InitSchema1700000000000 } from './migrations/1700000000000-InitSchema';
import { SeedSystemData1700000000100 } from './migrations/1700000000100-SeedSystemData';
import { AddCategoryTimestampsAndUniqueAbbrev1700000000200 } from './migrations/1700000000200-AddCategoryTimestampsAndUniqueAbbrev';
import { UpdateSystemCategoryKeys1700000000300 } from './migrations/1700000000300-UpdateSystemCategoryKeys';
import { RepairCategorySchemaAndSystemCategories1700000000400 } from './migrations/1700000000400-RepairCategorySchemaAndSystemCategories';
import { UpgradeChallengeAdminSchema1700000000500 } from './migrations/1700000000500-UpgradeChallengeAdminSchema';
import { SeedSampleChallenges1700000000600 } from './migrations/1700000000600-SeedSampleChallenges';
import { DatabaseInitService } from './database-init.service';

const ENTITIES = [
  UserEntity,
  SettingEntity,
  CategoryEntity,
  ChallengeEntity,
  ChallengeFileEntity,
  SolveEntity,
  RefreshTokenEntity,
  BlogPostEntity,
];

const MIGRATIONS = [
  InitSchema1700000000000,
  SeedSystemData1700000000100,
  AddCategoryTimestampsAndUniqueAbbrev1700000000200,
  UpdateSystemCategoryKeys1700000000300,
  RepairCategorySchemaAndSystemCategories1700000000400,
  UpgradeChallengeAdminSchema1700000000500,
  SeedSampleChallenges1700000000600,
];

@Global()
@Module({
  imports: [
    TypeOrmModule.forRootAsync({
      imports: [ConfigModule],
      inject: [ConfigService],
      useFactory: (config: ConfigService) => {
        const dbPath = config.get<string>('DATABASE_PATH', './data/db.sqlite');
        const isMemory = dbPath === ':memory:' || dbPath.startsWith('file:');
        if (!isMemory) {
          const dir = path.dirname(dbPath);
          if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
        }
        return {
          type: 'better-sqlite3',
          database: dbPath,
          entities: ENTITIES,
          migrations: MIGRATIONS,
          migrationsRun: false,
          synchronize: false,
          logging: false,
        };
      },
    }),
    TypeOrmModule.forFeature(ENTITIES),
  ],
  providers: [DatabaseInitService],
  exports: [TypeOrmModule, DatabaseInitService],
})
export class DatabaseModule {
  private readonly logger = new Logger(DatabaseModule.name);
}