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

import {
  DEFAULT_EXPORT_LIMITS,
  MYSQL2_EXPORTER_METADATA,
  SchemaExportError,
  assertMysql57ServerMetadata,
  buildConnectionOptions,
  orderViewNames,
  quoteIdentifier,
  readSchemaCatalog,
} 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 }));
  }
});

function createCatalogConnection(overrides = {}) {
  const rowsBySource = {
    'information_schema.TABLES': [
      { TABLE_NAME: 'market_snapshot', TABLE_TYPE: 'BASE TABLE' },
      { TABLE_NAME: 'market_dashboard', TABLE_TYPE: 'VIEW' },
      { TABLE_NAME: 'market_summary', TABLE_TYPE: 'VIEW' },
    ],
    'information_schema.VIEW_TABLE_USAGE': [
      {
        VIEW_NAME: 'market_dashboard',
        REFERENCED_SCHEMA_NAME: 'a_share_analysis_dev',
        REFERENCED_TABLE_NAME: 'market_summary',
      },
      {
        VIEW_NAME: 'market_summary',
        REFERENCED_SCHEMA_NAME: 'a_share_analysis_dev',
        REFERENCED_TABLE_NAME: 'market_snapshot',
      },
    ],
    'information_schema.ROUTINES': [
      { ROUTINE_NAME: 'calculate_breadth', ROUTINE_TYPE: 'FUNCTION' },
      { ROUTINE_NAME: 'refresh_market_snapshot', ROUTINE_TYPE: 'PROCEDURE' },
    ],
    'information_schema.TRIGGERS': [
      {
        TRIGGER_NAME: 'snapshot_before_insert',
        EVENT_OBJECT_TABLE: 'market_snapshot',
        ACTION_TIMING: 'BEFORE',
        EVENT_MANIPULATION: 'INSERT',
        ACTION_ORDER: 1,
      },
    ],
    'information_schema.EVENTS': [{ EVENT_NAME: 'purge_market_snapshot' }],
    ...overrides,
  };
  const calls = [];
  return {
    calls,
    async query(options) {
      calls.push(options);
      const source = Object.keys(rowsBySource).find((candidate) => options.sql.includes(candidate));
      assert.ok(source, `未识别的目录查询：${options.sql}`);
      return [rowsBySource[source], []];
    },
  };
}

test('目录查询使用固定参数和超时并返回稳定对象', async () => {
  const connection = createCatalogConnection();
  const catalog = await readSchemaCatalog(connection, 'a_share_analysis_dev', DEFAULT_EXPORT_LIMITS);

  assert.deepEqual(catalog, {
    tables: ['market_snapshot'],
    views: ['market_dashboard', 'market_summary'],
    viewDependencies: [
      {
        view: 'market_dashboard',
        referencedSchema: 'a_share_analysis_dev',
        referencedObject: 'market_summary',
      },
      {
        view: 'market_summary',
        referencedSchema: 'a_share_analysis_dev',
        referencedObject: 'market_snapshot',
      },
    ],
    routines: [
      { name: 'calculate_breadth', type: 'FUNCTION' },
      { name: 'refresh_market_snapshot', type: 'PROCEDURE' },
    ],
    triggers: [
      {
        name: 'snapshot_before_insert',
        table: 'market_snapshot',
        timing: 'BEFORE',
        event: 'INSERT',
        order: 1,
      },
    ],
    events: ['purge_market_snapshot'],
  });
  assert.equal(connection.calls.length, 5);
  for (const call of connection.calls) {
    assert.deepEqual(call.values, ['a_share_analysis_dev']);
    assert.equal(call.timeout, DEFAULT_EXPORT_LIMITS.queryTimeoutMs);
  }
});

test('视图按依赖拓扑排序且同层按名称稳定排序', () => {
  const catalog = {
    tables: ['market_snapshot'],
    views: ['z_dashboard', 'market_summary', 'a_dashboard'],
    viewDependencies: [
      {
        view: 'z_dashboard',
        referencedSchema: 'a_share_analysis_dev',
        referencedObject: 'market_summary',
      },
      {
        view: 'a_dashboard',
        referencedSchema: 'a_share_analysis_dev',
        referencedObject: 'market_summary',
      },
      {
        view: 'market_summary',
        referencedSchema: 'a_share_analysis_dev',
        referencedObject: 'market_snapshot',
      },
    ],
  };

  assert.deepEqual(orderViewNames(catalog), ['market_summary', 'a_dashboard', 'z_dashboard']);
});

test('视图排序拒绝循环、跨库和未知依赖', () => {
  const base = { tables: ['market_snapshot'], views: ['first_view', 'second_view'] };
  const invalidCases = [
    {
      code: 'VIEW_DEPENDENCY_CYCLE',
      dependencies: [
        { view: 'first_view', referencedSchema: 'a_share_analysis_dev', referencedObject: 'second_view' },
        { view: 'second_view', referencedSchema: 'a_share_analysis_dev', referencedObject: 'first_view' },
      ],
    },
    {
      code: 'CROSS_SCHEMA_VIEW_DEPENDENCY',
      dependencies: [
        { view: 'first_view', referencedSchema: 'production', referencedObject: 'market_snapshot' },
      ],
    },
    {
      code: 'UNKNOWN_VIEW_DEPENDENCY',
      dependencies: [
        { view: 'first_view', referencedSchema: 'a_share_analysis_dev', referencedObject: 'missing_object' },
      ],
    },
  ];

  for (const invalid of invalidCases) {
    assert.throws(
      () => orderViewNames({ ...base, viewDependencies: invalid.dependencies }),
      (error) => error instanceof SchemaExportError && error.code === invalid.code,
    );
  }
});

test('目录拒绝未知表类型和超过对象上限', async () => {
  const unknownType = createCatalogConnection({
    'information_schema.TABLES': [{ TABLE_NAME: 'temporary_data', TABLE_TYPE: 'SYSTEM VIEW' }],
  });
  await assert.rejects(
    () => readSchemaCatalog(unknownType, 'a_share_analysis_dev', DEFAULT_EXPORT_LIMITS),
    (error) => error instanceof SchemaExportError && error.code === 'UNKNOWN_TABLE_TYPE',
  );

  const overLimit = createCatalogConnection({
    'information_schema.TABLES': [
      { TABLE_NAME: 'first_table', TABLE_TYPE: 'BASE TABLE' },
      { TABLE_NAME: 'second_table', TABLE_TYPE: 'BASE TABLE' },
    ],
  });
  await assert.rejects(
    () => readSchemaCatalog(overLimit, 'a_share_analysis_dev', { ...DEFAULT_EXPORT_LIMITS, maxObjects: 1 }),
    (error) => error instanceof SchemaExportError && error.code === 'OBJECT_LIMIT_EXCEEDED',
  );
});