/**
 * OmniCard AI (CRMmp) - 产品相册与标杆案例移动端业务逻辑驱动层
 * 严格遵循 uts 强类型契约与 AGENTS.md 规范
 */

import { CardCase, OwnerPageData, OwnerPageQuery } from '../../../common/types.uts';
import {
  fetchCardCasesPage,
  addCardCase,
  updateCardCase,
  deleteCardCase,
} from '../../../common/api.uts';
import { getCurrentLocale } from '../../../common/locale.uts';

export type CasesApi = {
  fetchPage: (query: OwnerPageQuery) => Promise<OwnerPageData<CardCase>>;
  addCase: (data: Partial<CardCase>) => Promise<CardCase>;
  updateCase: (data: Partial<CardCase> & { id: string | number }) => Promise<CardCase>;
  deleteCase: (id: string | number) => Promise<boolean>;
};

export const defaultCasesApi: CasesApi = {
  fetchPage: (query: OwnerPageQuery) => fetchCardCasesPage(query),
  addCase: (data: Partial<CardCase>) => addCardCase(data),
  updateCase: (data: Partial<CardCase> & { id: string | number }) => updateCardCase(data),
  deleteCase: (id: string | number) => deleteCardCase(id),
};

export type CasesState = {
  cardId: string | number;
  list: CardCase[];
  loading: boolean;
  empty: boolean;
  errorMessage: string;
  drawerVisible: boolean;
  editingCase: Partial<CardCase> | null;
  saving: boolean;
};

export function createCasesState(cardId: string | number): CasesState {
  return {
    cardId,
    list: [],
    loading: false,
    empty: false,
    errorMessage: '',
    drawerVisible: false,
    editingCase: null,
    saving: false,
  };
}

export function validateCaseForm(form: Partial<CardCase>): string | null {
  const title = form.title != null ? form.title.trim() : '';
  if (title === '') {
    return resolveCasesText('errTitleRequired');
  }
  if (title.length > 150) {
    return resolveCasesText('errTitleTooLong');
  }
  return null;
}

export async function loadCases(
  state: CasesState,
  api: CasesApi = defaultCasesApi
): Promise<void> {
  state.loading = true;
  state.errorMessage = '';
  try {
    const res = await api.fetchPage({
      page: 1,
      size: 50,
      cardId: state.cardId,
    });
    const items = res.list != null ? res.list : [];
    state.list = items;
    state.empty = items.length === 0;
  } catch (err: any) {
    state.errorMessage = err.message || resolveCasesText('errLoadFailed');
  } finally {
    state.loading = false;
  }
}

export async function saveCase(
  state: CasesState,
  form: Partial<CardCase>,
  api: CasesApi = defaultCasesApi
): Promise<boolean> {
  const err = validateCaseForm(form);
  if (err !== null) {
    state.errorMessage = err;
    return false;
  }

  state.saving = true;
  state.errorMessage = '';
  try {
    const payload: Partial<CardCase> = {
      ...form,
      cardId: state.cardId,
      title: form.title!.trim(),
    };

    if (form.id != null) {
      await api.updateCase({
        ...payload,
        id: form.id,
      });
    } else {
      await api.addCase(payload);
    }

    state.drawerVisible = false;
    state.editingCase = null;
    await loadCases(state, api);
    return true;
  } catch (err: any) {
    state.errorMessage = err.message || resolveCasesText('errSaveFailed');
    return false;
  } finally {
    state.saving = false;
  }
}

export async function deleteCase(
  state: CasesState,
  id: string | number,
  api: CasesApi = defaultCasesApi
): Promise<boolean> {
  state.saving = true;
  state.errorMessage = '';
  try {
    const ok = await api.deleteCase(id);
    if (ok) {
      await loadCases(state, api);
      return true;
    }
    return false;
  } catch (err: any) {
    state.errorMessage = err.message || resolveCasesText('errDeleteFailed');
    return false;
  } finally {
    state.saving = false;
  }
}

export type CasesCopyKey =
  | 'title'
  | 'subtitle'
  | 'addBtn'
  | 'editBtn'
  | 'deleteBtn'
  | 'emptyTitle'
  | 'emptyDesc'
  | 'fieldTitle'
  | 'fieldClient'
  | 'fieldDuration'
  | 'fieldMetrics'
  | 'fieldDesc'
  | 'fieldCover'
  | 'saveBtn'
  | 'cancelBtn'
  | 'phTitle'
  | 'phClient'
  | 'phDuration'
  | 'phMetrics'
  | 'phDesc'
  | 'clientPrefix'
  | 'coverPlaceholder'
  | 'saving'
  | 'savedToast'
  | 'deletedToast'
  | 'deleteConfirmTitle'
  | 'deleteConfirmContent'
  | 'deleteConfirmOk'
  | 'errTitleRequired'
  | 'errTitleTooLong'
  | 'errLoadFailed'
  | 'errSaveFailed'
  | 'errDeleteFailed';

export function resolveCasesText(key: CasesCopyKey): string {
  const locale = getCurrentLocale();
  const zh = locale === 'zh-CN';

  switch (key) {
    case 'title':
      // 兼容历史标题匹配: 产品相册与标杆案例，规范展示为产品与案例
      return zh ? '产品与案例' : 'Portfolio & Case Studies';
    case 'subtitle':
      return zh ? '维护产品案例，并在微官网中展示' : 'Showcase your products and case studies on your micro-site.';
    case 'addBtn':
      return zh ? '新增案例' : 'Add Case Study';
    case 'editBtn':
      return zh ? '编辑' : 'Edit';
    case 'deleteBtn':
      return zh ? '删除' : 'Delete';
    case 'emptyTitle':
      return zh ? '暂无产品案例' : 'No Cases Yet';
    case 'emptyDesc':
      return zh ? '可添加产品相册与案例展示' : 'Tap below to add your first product showcase or case study.';
    case 'fieldTitle':
      return zh ? '案例/产品名称' : 'Title';
    case 'fieldClient':
      return zh ? '合作客商/品牌 (选填)' : 'Client / Brand';
    case 'fieldDuration':
      return zh ? '项目周期 (选填)' : 'Timeline';
    case 'fieldMetrics':
      return zh ? '成效标签' : 'Key Metrics Tag';
    case 'fieldDesc':
      return zh ? '方案与成果描述' : 'Overview';
    case 'fieldCover':
      return zh ? '产品封面与相册图片' : 'Cover & Photos';
    case 'saveBtn':
      return zh ? '保存案例' : 'Save Case';
    case 'cancelBtn':
      return zh ? '取消' : 'Cancel';
    case 'phTitle':
      return zh ? '输入案例或产品名称' : 'Enter case or product title';
    case 'phClient':
      return zh ? '选填合作客商或品牌' : 'Optional client or brand';
    case 'phDuration':
      return zh ? '例如项目起止时间' : 'e.g. project timeline';
    case 'phMetrics':
      return zh ? '选填成效标签' : 'Optional metrics tag';
    case 'phDesc':
      return zh ? '简述方案背景、成效或客户反馈' : 'Brief overview, outcomes, or feedback';
    case 'clientPrefix':
      return zh ? '合作客户: ' : 'Client: ';
    case 'coverPlaceholder':
      return zh ? '产品展示' : 'Showcase';
    case 'saving':
      return zh ? '保存中...' : 'Saving...';
    case 'savedToast':
      return zh ? '案例已保存' : 'Case Saved';
    case 'deletedToast':
      return zh ? '已删除' : 'Deleted';
    case 'deleteConfirmTitle':
      return zh ? '确认删除' : 'Confirm Delete';
    case 'deleteConfirmContent':
      return zh ? '确定要删除该案例吗？此操作无法撤销。' : 'Are you sure you want to delete this case?';
    case 'deleteConfirmOk':
      return zh ? '删除' : 'Delete';
    case 'errTitleRequired':
      return zh ? '请输入案例或产品标题' : 'Please enter a title';
    case 'errTitleTooLong':
      return zh ? '标题长度不能超过 150 个字符' : 'Title must be 150 characters or fewer';
    case 'errLoadFailed':
      return zh ? '加载案例列表失败' : 'Failed to load cases';
    case 'errSaveFailed':
      return zh ? '保存案例失败' : 'Failed to save case';
    case 'errDeleteFailed':
      return zh ? '删除案例失败' : 'Failed to delete case';
    default:
      return '';
  }
}