/**
 * OmniCard AI (CRMmp) - 文章动态中心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 { CardArticle, OwnerPageData, OwnerPageQuery } from '../../../common/types.uts';
import {
  fetchCardArticlesPage,
  addCardArticle,
  updateCardArticle,
  deleteCardArticle,
} from '../../../common/api.uts';
import { getCurrentLocale } from '../../../common/locale.uts';

export type ArticlesApi = {
  fetchPage: (query: OwnerPageQuery) => Promise<OwnerPageData<CardArticle>>;
  addArticle: (data: Partial<CardArticle>) => Promise<CardArticle>;
  updateArticle: (data: Partial<CardArticle> & { id: string | number }) => Promise<CardArticle>;
  deleteArticle: (id: string | number) => Promise<boolean>;
};

export const defaultArticlesApi: ArticlesApi = {
  fetchPage: (query: OwnerPageQuery) => fetchCardArticlesPage(query),
  addArticle: (data: Partial<CardArticle>) => addCardArticle(data),
  updateArticle: (data: Partial<CardArticle> & { id: string | number }) => updateCardArticle(data),
  deleteArticle: (id: string | number) => deleteCardArticle(id),
};

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

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

export function extractArticleSummary(content?: string, maxLen: number = 120): string {
  if (content == null || content.trim() === '') {
    return '';
  }
  const plain = content
    .replace(/<[^>]+>/g, '') // 剥离 HTML
    .replace(/!\[.*?\]\(.*?\)/g, '') // 剥离 Markdown 图片
    .replace(/\[(.*?)\]\(.*?\)/g, '$1') // 提取 Markdown 链接文本
    .replace(/[#*`_~>-]/g, '') // 移除 Markdown 常用标记
    .replace(/\s+/g, ' ') // 压缩多余空格
    .trim();

  return plain.length > maxLen ? plain.slice(0, maxLen) : plain;
}

export function validateArticleForm(form: Partial<CardArticle>): string | null {
  const title = form.title != null ? form.title.trim() : '';
  if (title === '') {
    return resolveArticlesText('errTitleRequired');
  }
  const content = form.content != null ? form.content.trim() : '';
  if (content === '') {
    return resolveArticlesText('errContentRequired');
  }
  return null;
}

export async function loadArticles(
  state: ArticlesState,
  api: ArticlesApi = defaultArticlesApi
): 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 || resolveArticlesText('errLoadFailed');
  } finally {
    state.loading = false;
  }
}

export async function saveArticle(
  state: ArticlesState,
  form: Partial<CardArticle>,
  api: ArticlesApi = defaultArticlesApi
): Promise<boolean> {
  const err = validateArticleForm(form);
  if (err !== null) {
    state.errorMessage = err;
    return false;
  }

  state.saving = true;
  state.errorMessage = '';
  try {
    const summary = (form.summary != null && form.summary!.trim() !== '')
      ? form.summary!.trim()
      : extractArticleSummary(form.content);

    const payload: Partial<CardArticle> = {
      ...form,
      cardId: state.cardId,
      title: form.title!.trim(),
      summary,
      content: form.content!.trim(),
      isPublished: form.isPublished !== undefined ? form.isPublished : true,
    };

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

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

export async function toggleArticlePublish(
  state: ArticlesState,
  article: CardArticle,
  api: ArticlesApi = defaultArticlesApi
): Promise<boolean> {
  if (article.id == null) {
    return false;
  }
  state.saving = true;
  state.errorMessage = '';
  try {
    const targetStatus = !article.isPublished;
    await api.updateArticle({
      id: article.id,
      cardId: article.cardId,
      isPublished: targetStatus,
    });
    article.isPublished = targetStatus;
    return true;
  } catch (err: any) {
    state.errorMessage = err.message || resolveArticlesText('errToggleFailed');
    return false;
  } finally {
    state.saving = false;
  }
}

export async function deleteArticle(
  state: ArticlesState,
  id: string | number,
  api: ArticlesApi = defaultArticlesApi
): Promise<boolean> {
  state.saving = true;
  state.errorMessage = '';
  try {
    const ok = await api.deleteArticle(id);
    if (ok) {
      await loadArticles(state, api);
      return true;
    }
    return false;
  } catch (err: any) {
    state.errorMessage = err.message || resolveArticlesText('errDeleteFailed');
    return false;
  } finally {
    state.saving = false;
  }
}

export type ArticlesCopyKey =
  | 'title'
  | 'subtitle'
  | 'publishBtn'
  | 'editBtn'
  | 'deleteBtn'
  | 'emptyTitle'
  | 'emptyDesc'
  | 'statusPublished'
  | 'statusDraft'
  | 'fieldTitle'
  | 'fieldSummary'
  | 'fieldCover'
  | 'fieldContent'
  | 'fieldPublish'
  | 'publishDesc'
  | 'phTitle'
  | 'phSummary'
  | 'phContent'
  | 'saveBtn'
  | 'cancelBtn'
  | 'saving'
  | 'savedToast'
  | 'statusUpdatedToast'
  | 'deletedToast'
  | 'deleteConfirmTitle'
  | 'deleteConfirmContent'
  | 'deleteConfirmOk'
  | 'errTitleRequired'
  | 'errContentRequired'
  | 'errLoadFailed'
  | 'errSaveFailed'
  | 'errDeleteFailed'
  | 'errToggleFailed';

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

  switch (key) {
    case 'title':
      return zh ? '文章与商务动态' : 'Insights & Articles';
    case 'subtitle':
      return zh ? '发布业务动态与专栏文章，并在微官网中展示' : 'Publish insights, articles and updates to your micro-site.';
    case 'publishBtn':
      return zh ? '发布动态' : 'New Article';
    case 'editBtn':
      return zh ? '编辑' : 'Edit';
    case 'deleteBtn':
      return zh ? '删除' : 'Delete';
    case 'emptyTitle':
      return zh ? '暂无文章动态' : 'No Articles Yet';
    case 'emptyDesc':
      return zh ? '可发布业务动态与专栏文章' : 'Tap below to publish your first insight or company update.';
    case 'statusPublished':
      return zh ? '已发布' : 'Published';
    case 'statusDraft':
      return zh ? '草稿' : 'Draft';
    case 'fieldTitle':
      return zh ? '文章标题' : 'Title';
    case 'fieldSummary':
      return zh ? '摘要导读 (选填)' : 'Summary';
    case 'fieldCover':
      return zh ? '封面图片' : 'Cover Image';
    case 'fieldContent':
      return zh ? '文章正文 (支持富文本与 Markdown)' : 'Content';
    case 'fieldPublish':
      return zh ? '公开发布至微官网' : 'Publish to Micro-site';
    case 'publishDesc':
      return zh
        ? '开启后，全球访客可在您的名片微官网中直接浏览'
        : 'When enabled, visitors can view this insight on your micro-site';
    case 'phTitle':
      return zh ? '输入文章或动态标题' : 'Enter article or insight title';
    case 'phSummary':
      return zh ? '选填，不填将从正文自动提取' : 'Optional; auto-extracted from content if empty';
    case 'phContent':
      return zh ? '输入正文，支持段落与 Markdown' : 'Write content; paragraphs and Markdown supported';
    case 'saveBtn':
      return zh ? '确认发布' : 'Publish';
    case 'cancelBtn':
      return zh ? '取消' : 'Cancel';
    case 'saving':
      return zh ? '保存中...' : 'Saving...';
    case 'savedToast':
      return zh ? '动态已保存' : 'Article Saved';
    case 'statusUpdatedToast':
      return zh ? '状态已切换' : 'Status Updated';
    case 'deletedToast':
      return zh ? '已删除' : 'Deleted';
    case 'deleteConfirmTitle':
      return zh ? '确认删除' : 'Confirm Delete';
    case 'deleteConfirmContent':
      return zh ? '确定要删除该文章动态吗？' : 'Are you sure you want to delete this article?';
    case 'deleteConfirmOk':
      return zh ? '删除' : 'Delete';
    case 'errTitleRequired':
      return zh ? '请输入文章或动态标题' : 'Please enter a title';
    case 'errContentRequired':
      return zh ? '请输入文章正文内容' : 'Please enter article content';
    case 'errLoadFailed':
      return zh ? '加载文章列表失败' : 'Failed to load articles';
    case 'errSaveFailed':
      return zh ? '保存文章失败' : 'Failed to save article';
    case 'errDeleteFailed':
      return zh ? '删除文章失败' : 'Failed to delete article';
    case 'errToggleFailed':
      return zh ? '切换发布状态失败' : 'Failed to update publish status';
    default:
      return '';
  }
}