import assert from 'node:assert/strict';
import test from 'node:test';

import {
  DEFAULT_EXPORT_LIMITS,
  MYSQL2_EXPORTER_METADATA,
  SchemaExportError,
  assertMysql57ServerMetadata,
  buildConnectionOptions,
  quoteIdentifier,
} from './mysql2-schema-exporter.mjs';

const config = Object.freeze({
  MYSQL_HOST: '127.0.0.1',
  MYSQL_PORT: '3306',
  MYSQL_DATABASE: 'a_share_analysis_dev',
  MYSQL_USERNAME: 'schema_reader',
  MYSQL_PASSWORD: 'not-for-logs',
});

test('连接配置固定单连接、utf8mb4、东八区且禁用多语句', () => {
  const options = buildConnectionOptions(config);
  assert.deepEqual(options, {
    host: '127.0.0.1',
    port: 3306,
    user: 'schema_reader',
    password: 'not-for-logs',
    database: 'a_share_analysis_dev',
    charset: 'utf8mb4',
    timezone: '+08:00',
    connectTimeout: 5_000,
    multipleStatements: false,
    enableKeepAlive: true,
  });
});

test('标识符转义反引号并拒绝空值和控制字符', () => {
  assert.equal(quoteIdentifier('market`view'), '`market``view`');
  for (const value of ['', 'line\nbreak', 'zero\0byte']) {
    assert.throws(() => quoteIdentifier(value), SchemaExportError);
  }
});

test('只接受 MySQL 5.7.x 与固定字符规则', () => {
  const valid = {
    serverVersion: '5.7.42-log',
    databaseCharset: 'utf8mb4',
    databaseCollation: 'utf8mb4_general_ci',
  };
  assert.doesNotThrow(() => assertMysql57ServerMetadata(valid));
  for (const serverVersion of [
    '5.6.51',
    '8.0.40',
    '5.7.42-MariaDB',
    '10.6.18-MariaDB',
  ]) {
    assert.throws(() => assertMysql57ServerMetadata({ ...valid, serverVersion }));
  }
});