#!/usr/bin/env node
import {
  buildPgvectorMemorySchemaSql,
  ensurePgvectorMemorySchema,
} from '../memory-v2-pgvector-schema.mjs';

const DEFAULT_URL_ENV = 'MEMORY_PGVECTOR_DATABASE_URL';

function usage() {
  return `
Usage:
  node scripts/setup-memory-v2-pgvector-schema.mjs [options]

Default mode is dry-run: print SQL only.

Options:
  --apply                 Execute SQL against PostgreSQL.
  --table <name>          Table name. Default: memory_embeddings.
  --dimensions <number>   Embedding dimensions. Default: 1536.
  --create-extension      Include CREATE EXTENSION IF NOT EXISTS vector.
  --create-vector-index   Include ivfflat vector index creation.
  --url-env <name>        Env var containing PostgreSQL URL. Default: ${DEFAULT_URL_ENV}.
  -h, --help              Show this help.
`.trim();
}

export function parseMemoryPgvectorSchemaArgs(argv = []) {
  const options = {
    apply: false,
    tableName: 'memory_embeddings',
    dimensions: 1536,
    createExtension: false,
    createVectorIndex: false,
    urlEnv: DEFAULT_URL_ENV,
    help: false,
  };

  for (let i = 0; i < argv.length; i += 1) {
    const arg = argv[i];
    switch (arg) {
      case '--apply':
        options.apply = true;
        break;
      case '--create-extension':
        options.createExtension = true;
        break;
      case '--create-vector-index':
        options.createVectorIndex = true;
        break;
      case '--table':
        i += 1;
        options.tableName = argv[i];
        break;
      case '--dimensions':
        i += 1;
        options.dimensions = Number(argv[i]);
        break;
      case '--url-env':
        i += 1;
        options.urlEnv = argv[i];
        break;
      case '-h':
      case '--help':
        options.help = true;
        break;
      default:
        throw new Error(`Unknown argument: ${arg}`);
    }
  }

  if (!options.tableName) throw new Error('--table requires a value');
  if (!Number.isFinite(options.dimensions)) throw new Error('--dimensions requires a number');
  if (!options.urlEnv) throw new Error('--url-env requires a value');
  return options;
}

function printSql(statements) {
  for (const statement of statements) {
    console.log(`${statement};\n`);
  }
}

export async function runMemoryPgvectorSchemaCli(argv = process.argv.slice(2), env = process.env) {
  const options = parseMemoryPgvectorSchemaArgs(argv);
  if (options.help) {
    console.log(usage());
    return { ok: true, mode: 'help' };
  }

  const schemaOptions = {
    tableName: options.tableName,
    dimensions: options.dimensions,
    createExtension: options.createExtension,
    createVectorIndex: options.createVectorIndex,
  };
  const statements = buildPgvectorMemorySchemaSql(schemaOptions);

  if (!options.apply) {
    console.log('-- Memory V2 pgvector schema dry-run');
    console.log('-- No database changes were made. Re-run with --apply to execute.');
    printSql(statements);
    return { ok: true, mode: 'dry-run', statements: statements.length };
  }

  const connectionString = env[options.urlEnv];
  if (!connectionString) {
    throw new Error(`--apply requires ${options.urlEnv} to be set`);
  }
  const { default: pg } = await import('pg');
  const pool = new pg.Pool({ connectionString, max: 1 });
  try {
    const result = await ensurePgvectorMemorySchema(pool, schemaOptions);
    console.log(
      `Memory V2 pgvector schema ensured: table=${result.tableName}, dimensions=${result.dimensions}, statements=${result.statements}`,
    );
    return { ok: true, mode: 'apply', ...result };
  } finally {
    await pool.end();
  }
}

if (import.meta.url === `file://${process.argv[1]}`) {
  runMemoryPgvectorSchemaCli().catch((err) => {
    console.error(err instanceof Error ? err.message : err);
    process.exitCode = 1;
  });
}