import { createUserDataSpaceService } from './user-data-space-service.mjs';

function mapServiceError(error) {
  const code = error?.code;
  if (code === 'dataset_not_found') {
    return { status: 404, code: 'dataset_not_found', message: '数据集不存在' };
  }
  if (code === 'action_not_allowed') {
    return { status: 403, code: 'action_not_allowed', message: error.message };
  }
  if (code === 'columns_not_allowed') {
    return { status: 403, code: 'columns_not_allowed', message: error.message };
  }
  if (code === 'invalid_payload' || code === 'payload_too_large' || code === 'invalid_dataset_config') {
    return { status: 400, code: code ?? 'invalid_request', message: error.message };
  }
  if (code === 'table_not_found') {
    return { status: 400, code: 'table_not_found', message: '数据集对应表不存在' };
  }
  return {
    status: 400,
    code: 'page_data_failed',
    message: error instanceof Error ? error.message : '页面数据操作失败',
  };
}

export function createPageDataService(deps = {}) {
  const getUserAuth = deps.getUserAuth ?? (() => null);
  const getPool = deps.getPool ?? (() => null);
  const resolveWorkspaceRoot =
    deps.resolveWorkspaceRoot ??
    (async (user) => user?.workspaceRoot ?? null);

  async function createServiceForUser(user) {
    if (!user?.id) {
      throw Object.assign(new Error('未授权'), { code: 'unauthorized' });
    }
    const workspaceRoot = await resolveWorkspaceRoot(user);
    if (!workspaceRoot) {
      throw Object.assign(new Error('用户工作区不存在'), { code: 'workspace_not_found' });
    }
    const pool = getPool();
    return createUserDataSpaceService({
      workspaceRoot,
      userId: user.id,
      query: pool ?? null,
    });
  }

  async function listRows(user, datasetName, query = {}) {
    const service = await createServiceForUser(user);
    try {
      return service.readDatasetRows(datasetName, {
        limit: query.limit,
        offset: query.offset,
        orderBy: query.orderBy ?? query.order_by,
        orderDir: query.orderDir ?? query.order_dir,
      });
    } catch (error) {
      throw mapServiceError(error);
    }
  }

  async function getSchema(user, datasetName) {
    const service = await createServiceForUser(user);
    try {
      return service.getDatasetSchema(datasetName);
    } catch (error) {
      throw mapServiceError(error);
    }
  }

  async function getStats(user, datasetName) {
    const service = await createServiceForUser(user);
    try {
      return service.getDatasetStats(datasetName);
    } catch (error) {
      throw mapServiceError(error);
    }
  }

  async function insertRow(user, datasetName, payload) {
    const service = await createServiceForUser(user);
    try {
      return service.insertDatasetRow(datasetName, payload);
    } catch (error) {
      throw mapServiceError(error);
    }
  }

  async function listDatasets(user) {
    const service = await createServiceForUser(user);
    return service.listDatasets().map((dataset) => ({
      name: dataset.name,
      table: dataset.table,
      description: dataset.description,
      actions: dataset.actions,
    }));
  }

  return {
    getUserAuth,
    listRows,
    getSchema,
    getStats,
    insertRow,
    listDatasets,
  };
}