#!/usr/bin/env node
process.env.DB_URL = process.env.DB_URL || 'postgres://postgres:postgres@localhost:5432/immich';

import { Kysely, sql } from 'kysely';
import { existsSync, mkdirSync, renameSync, rmSync, writeFileSync } from 'node:fs';
import { basename, dirname, extname, join } from 'node:path';
import postgres from 'postgres';
import { ConfigRepository } from 'src/repositories/config.repository';
import { DatabaseRepository } from 'src/repositories/database.repository';
import { LoggingRepository } from 'src/repositories/logging.repository';
import 'src/schema';
import { schemaDiff, schemaFromCode, schemaFromDatabase } from 'src/sql-tools';
import { asPostgresConnectionConfig, getKyselyConfig } from 'src/utils/database';

const main = async () => {
  const command = process.argv[2];
  const path = process.argv[3] || 'src/Migration';

  switch (command) {
    case 'debug': {
      await debug();
      return;
    }

    case 'run': {
      await runMigrations();
      return;
    }

    case 'revert': {
      await revert();
      return;
    }

    case 'query': {
      const query = process.argv[3];
      await runQuery(query);
      return;
    }

    case 'create': {
      create(path, [], []);
      return;
    }

    case 'generate': {
      await generate(path);
      return;
    }

    default: {
      console.log(`Usage:
  node dist/bin/migrations.js create <name>
  node dist/bin/migrations.js generate <name>
  node dist/bin/migrations.js run
  node dist/bin/migrations.js revert
`);
    }
  }
};

const getDatabaseClient = () => {
  const configRepository = new ConfigRepository();
  const { database } = configRepository.getEnv();
  return new Kysely<any>(getKyselyConfig(database.config));
};

const runQuery = async (query: string) => {
  const db = getDatabaseClient();
  await sql.raw(query).execute(db);
  await db.destroy();
};

const runMigrations = async () => {
  const configRepository = new ConfigRepository();
  const logger = LoggingRepository.create();
  const db = getDatabaseClient();
  const databaseRepository = new DatabaseRepository(db, logger, configRepository);
  await databaseRepository.runMigrations();
  await db.destroy();
};

const revert = async () => {
  const configRepository = new ConfigRepository();
  const logger = LoggingRepository.create();
  const db = getDatabaseClient();
  const databaseRepository = new DatabaseRepository(db, logger, configRepository);

  try {
    const migrationName = await databaseRepository.revertLastMigration();
    if (!migrationName) {
      console.log('No migrations to revert');
      return;
    }

    markMigrationAsReverted(migrationName);
  } finally {
    await db.destroy();
  }
};

const debug = async () => {
  const { up } = await compare();
  const upSql = '-- UP\n' + up.asSql({ comments: true }).join('\n');
  // const downSql = '-- DOWN\n' + down.asSql({ comments: true }).join('\n');
  writeFileSync('./migrations.sql', upSql + '\n\n');
  console.log('Wrote migrations.sql');
};

const generate = async (path: string) => {
  const { up, down } = await compare();
  if (up.items.length === 0) {
    console.log('No changes detected');
    return;
  }
  create(path, up.asSql(), down.asSql());
};

const create = (path: string, up: string[], down: string[]) => {
  const timestamp = Date.now();
  const name = basename(path, extname(path));
  const filename = `${timestamp}-${name}.ts`;
  const folder = dirname(path);
  const fullPath = join(folder, filename);
  mkdirSync(folder, { recursive: true });
  writeFileSync(fullPath, asMigration({ up, down }));
  console.log(`Wrote ${fullPath}`);
};

const compare = async () => {
  const configRepository = new ConfigRepository();
  const { database } = configRepository.getEnv();
  const db = postgres(asPostgresConnectionConfig(database.config));

  const source = schemaFromCode({ overrides: true, namingStrategy: 'default' });
  const target = await schemaFromDatabase(db, {});

  console.log(source.warnings.join('\n'));

  const up = schemaDiff(source, target, {
    tables: { ignoreExtra: true },
    functions: { ignoreExtra: false },
    parameters: { ignoreExtra: true },
  });
  const down = schemaDiff(target, source, {
    tables: { ignoreExtra: false, ignoreMissing: true },
    functions: { ignoreExtra: false },
    extensions: { ignoreMissing: true },
    parameters: { ignoreMissing: true },
  });

  return { up, down };
};

type MigrationProps = {
  up: string[];
  down: string[];
};

const asMigration = ({ up, down }: MigrationProps) => {
  const upSql = up.map((sql) => `  await sql\`${sql}\`.execute(db);`).join('\n');
  const downSql = down.map((sql) => `  await sql\`${sql}\`.execute(db);`).join('\n');

  return `import { Kysely, sql } from 'kysely';

export async function up(db: Kysely<any>): Promise<void> {
${upSql}
}

export async function down(db: Kysely<any>): Promise<void> {
${downSql}
}
`;
};

const markMigrationAsReverted = (migrationName: string) => {
  // eslint-disable-next-line unicorn/prefer-module
  const distRoot = join(__dirname, '..');
  const projectRoot = join(distRoot, '..');
  const sourceFolder = join(projectRoot, 'src', 'schema', 'migrations');
  const distFolder = join(distRoot, 'schema', 'migrations');

  const sourcePath = join(sourceFolder, `${migrationName}.ts`);
  const revertedFolder = join(sourceFolder, 'reverted');
  const revertedPath = join(revertedFolder, `${migrationName}.ts`);

  if (existsSync(revertedPath)) {
    console.log(`Migration ${migrationName} is already marked as reverted`);
  } else if (existsSync(sourcePath)) {
    mkdirSync(revertedFolder, { recursive: true });
    renameSync(sourcePath, revertedPath);
    console.log(`Moved ${sourcePath} to ${revertedPath}`);
  } else {
    console.warn(`Source migration file not found for ${migrationName}`);
  }

  const distBase = join(distFolder, migrationName);
  for (const extension of ['.js', '.js.map', '.d.ts']) {
    const filePath = `${distBase}${extension}`;
    if (existsSync(filePath)) {
      rmSync(filePath, { force: true });
      console.log(`Removed ${filePath}`);
    }
  }
};

main()
  .then(() => {
    process.exit(0);
  })
  .catch((error) => {
    console.error(error);
    console.log('Something went wrong');
    process.exit(1);
  });