import { KintoneRestAPIClient } from '@kintone/rest-api-client';
import i18n from 'i18next';
import {
  type PluginConfig,
  type PluginConfigApp,
  PluginConfigDataSource,
  type PluginConfigSelf,
} from '../common/config';
import { DOCX_CONTENT_TYPE } from '../common/constants';

const checkConfigSelf = (config: PluginConfigSelf, record: kintone.types.SavedFields): string => {
  const { fieldCode } = config;
  if (fieldCode === '') {
    throw new Error(i18n.t('errors.template-field-is-required'));
  }
  const field = record[fieldCode];
  if (!field) {
    throw new Error(i18n.t('errors.template-field-is-not-available'));
  }
  if (field.type !== 'FILE') {
    throw new Error(i18n.t('errors.template-field-must-be-an-attachment-field'));
  }
  const files = Array.isArray(field.value) ? (field.value as kintone.fieldTypes.File['value']) : [];
  if (files.length === 0) {
    throw new Error(i18n.t('errors.template-field-does-not-contain-any-files'));
  }
  if (files.length > 1) {
    throw new Error(i18n.t('errors.template-field-contains-multiple-files'));
  }
  if (files[0].contentType !== DOCX_CONTENT_TYPE) {
    throw new Error(i18n.t('errors.template-file-must-be-a-docx', { contentType: files[0].contentType }));
  }
  return files[0].fileKey;
};

const checkConfigApp = async (config: PluginConfigApp): Promise<string> => {
  const { appId, fieldCode, recordId } = config;
  if (appId === '') {
    throw new Error(i18n.t('errors.app-id-is-required'));
  }
  if (recordId === '') {
    throw new Error(i18n.t('errors.record-id-is-required'));
  }
  if (fieldCode === '') {
    throw new Error(i18n.t('errors.template-field-is-required'));
  }
  const client = new KintoneRestAPIClient();
  const { record } = await client.record.getRecord({ app: appId, id: recordId }).catch((_error) => {
    throw new Error(i18n.t('errors.record-is-not-available'));
  });
  const field = record[fieldCode];
  if (!field) {
    throw new Error(i18n.t('errors.template-field-is-not-available'));
  }
  if (field.type !== 'FILE') {
    throw new Error(i18n.t('errors.template-field-must-be-an-attachment-field'));
  }
  const files = Array.isArray(field.value) ? (field.value as kintone.fieldTypes.File['value']) : [];
  if (files.length === 0) {
    throw new Error(i18n.t('errors.template-field-does-not-contain-any-files'));
  }
  if (files.length > 1) {
    throw new Error(i18n.t('errors.template-field-contains-multiple-files'));
  }
  if (files[0].contentType !== DOCX_CONTENT_TYPE) {
    throw new Error(i18n.t('errors.template-file-must-be-a-docx', { contentType: files[0].contentType }));
  }
  return files[0].fileKey;
};

export const checkConfig = async (config: PluginConfig, record: kintone.types.SavedFields): Promise<string> => {
  if (config.dataSource === PluginConfigDataSource.SELF) {
    return checkConfigSelf(config, record);
  } else if (config.dataSource === PluginConfigDataSource.APP) {
    return checkConfigApp(config);
  }
  throw new Error(i18n.t('errors.unexpected-error-occurred'));
};