/**
 * 找对象页 — 筛选对齐后端 DiscoverController 5 个筛选参数：
 *   minAge, maxAge, regionCode, maritalStatus, educationCode
 *
 * 不变量（AGENTS.md）：
 *   - Required 不可自动放宽——Discover 仅透传筛选条件到后端
 *   - Block 即时禁止互动
 *   - 单向意向不泄露
 */
// eslint-disable-next-line @typescript-eslint/no-unused-vars
import { matchStore, appStore, authStore } from '../../stores';
// eslint-disable-next-line @typescript-eslint/no-unused-vars
import { recommendationService } from '../../services';
// eslint-disable-next-line @typescript-eslint/no-unused-vars
import { to } from '../../constants';
import type { RecommendationCandidate } from '../../types';
// 顶部安全区：实测右上角胶囊按钮矩形，避免筛选条与搜索图标被胶囊压住（见 utils/nav-metrics.js）
// eslint-disable-next-line @typescript-eslint/no-var-requires
const { navSafeData } = require('../../utils/nav-metrics');

interface AppliedFilter {
  keyword: string;
  regionCode: string;      // 后端参数名
  minAge: number;
  maxAge: number;
  educationCode: string;   // 后端参数名
  maritalStatus: string;  // 后端参数名
}

interface DiscoverData {
  users: RecommendationCandidate[];
  loading: boolean;
  loadingMore: boolean;
  cursor: string | null;
  hasMore: boolean;
  keywordInput: string;
  showFilter: boolean;
  // 面板临时态
  tempRegionCode: string;
  tempMinAge: number;
  tempMaxAge: number;
  tempEducationCode: string;
  tempMaritalStatus: string;
  applied: AppliedFilter;
  hasActiveFilter: boolean;
  regions: Array<{ code: string; label: string }>;
  educations: Array<{ code: string; label: string }>;
  maritalStatuses: Array<{ code: string; label: string }>;
  actionLoadingUserId: string;
  // 抽屉滚动/高亮定位
  panelScrollTo: string;
  panelHighlight: string;
}

const DEFAULT_MIN_AGE = 18;
const DEFAULT_MAX_AGE = 60;
const PAGE_SIZE = 20;

Page({
  data: {
    navVars: '',
    users: [],
    loading: false,
    loadingMore: false,
    cursor: null,
    hasMore: true,
    keywordInput: '',
    showFilter: false,
    tempRegionCode: '',
    tempMinAge: DEFAULT_MIN_AGE,
    tempMaxAge: DEFAULT_MAX_AGE,
    tempEducationCode: '',
    tempMaritalStatus: '',
    applied: {
      keyword: '',
      regionCode: '',
      minAge: DEFAULT_MIN_AGE,
      maxAge: DEFAULT_MAX_AGE,
      educationCode: '',
      maritalStatus: '',
    },
    hasActiveFilter: false,
    regions: [
      { code: '321181', label: '丹阳' },
      { code: '321100', label: '镇江' },
      { code: '320100', label: '南京' },
    ],
    educations: [
      { code: 'high_school', label: '高中及以下' },
      { code: 'college', label: '大专' },
      { code: 'bachelor', label: '本科' },
      { code: 'master', label: '硕士及以上' },
    ],
    maritalStatuses: [
      { code: 'never_married', label: '未婚' },
      { code: 'divorced', label: '离异' },
    ],
    actionLoadingUserId: '',
    panelScrollTo: '',
    panelHighlight: '',
  } as DiscoverData,

  onLoad() {
    // 顶部安全区先算：onLoad 早于首次渲染，避免出现「先压住胶囊再跳开」的闪动
    this.setData(navSafeData());
    if (!authStore.state.isLoggedIn) return;
    this.fetchDiscover(true);
  },

  async fetchDiscover(first: boolean) {
    if (this.data.loading) return;
    this.setData({ loading: true });
    try {
      // @ts-ignore - recommendationService 接口待 TS 化
      const result = await recommendationService.discover(this._buildParams());
      const items: RecommendationCandidate[] = (result?.items as RecommendationCandidate[]) || [];
      this.setData({
        users: first ? items : [...this.data.users, ...items],
        cursor: result?.nextCursor || null,
        hasMore: !!result?.nextCursor,
        loading: false,
      });
    } catch (err: unknown) {
      this.setData({ loading: false });
      appStore.toastError(err instanceof Error ? err.message : '加载失败');
    }
  },

  async loadMore() {
    if (this.data.loadingMore || !this.data.hasMore || !this.data.cursor) return;
    this.setData({ loadingMore: true });
    try {
      // @ts-ignore
      const result = await recommendationService.discover({
        ...this._buildParams(),
        cursor: this.data.cursor,
      });
      const items: RecommendationCandidate[] = (result?.items as RecommendationCandidate[]) || [];
      this.setData({
        users: [...this.data.users, ...items],
        cursor: result?.nextCursor || null,
        hasMore: !!result?.nextCursor,
      });
    } catch (err: unknown) {
      appStore.toastError(err instanceof Error ? err.message : '加载失败');
    } finally {
      this.setData({ loadingMore: false });
    }
  },

  /** 对齐后端 DiscoverController 5 个筛选参数 */
  _buildParams() {
    const a = this.data.applied;
    const params: Record<string, unknown> = { pageSize: PAGE_SIZE };
    if (a.keyword) params.keyword = a.keyword;
    if (a.regionCode) params.regionCode = a.regionCode;
    if (a.minAge !== DEFAULT_MIN_AGE) params.minAge = a.minAge;
    if (a.maxAge !== DEFAULT_MAX_AGE) params.maxAge = a.maxAge;
    if (a.educationCode) params.educationCode = a.educationCode;
    if (a.maritalStatus) params.maritalStatus = a.maritalStatus;
    return params;
  },

  _hasActiveFilter(applied: AppliedFilter) {
    return !!(
      applied.keyword || applied.regionCode ||
      applied.minAge !== DEFAULT_MIN_AGE || applied.maxAge !== DEFAULT_MAX_AGE ||
      applied.educationCode || applied.maritalStatus
    );
  },

  // ========== 搜索框 ==========

  onKeywordInput(e: any) {
    this.setData({ keywordInput: e.detail.value });
  },

  onSearch() {
    const keyword = (this.data.keywordInput || '').trim();
    const applied = { ...this.data.applied, keyword };
    this.setData({ applied, hasActiveFilter: this._hasActiveFilter(applied) });
    this.fetchDiscover(true);
  },

  // ========== 顶部 chip 点击（即时应用） ==========

  onTopRegionTap() {
    // 丹阳本地 chip：regionCode=321181
    const target = '321181';
    const nextCode = this.data.applied.regionCode === target ? '' : target;
    const applied = { ...this.data.applied, regionCode: nextCode };
    this.setData({
      tempRegionCode: nextCode,
      applied,
      hasActiveFilter: this._hasActiveFilter(applied),
    });
    this.fetchDiscover(true);
  },

  /** 打开筛选面板，并同步当前 applied 状态到 temp，可选定位到 target section */
  openFilterPanel(e?: WechatMiniprogram.TouchEvent) {
    const target = e ? (e.currentTarget.dataset as any).target as string | undefined : undefined;
    const sectionMap: Record<string, string> = { age: 'sec-age', education: 'sec-education', marital: 'sec-marital', region: 'sec-region' };
    const a = this.data.applied;
    this.setData({
      showFilter: true,
      tempRegionCode: a.regionCode,
      tempMinAge: a.minAge,
      tempMaxAge: a.maxAge,
      tempEducationCode: a.educationCode,
      tempMaritalStatus: a.maritalStatus,
      panelScrollTo: target ? (sectionMap[target] || '') : '',
      panelHighlight: target || '',
    });
  },

  closeFilterPanel() {
    this.setData({ showFilter: false });
  },

  // ========== 筛选面板内交互 ==========

  onPanelRegionTap(e: WechatMiniprogram.TouchEvent) {
    const code = (e.currentTarget.dataset as any).code as string;
    this.setData({ tempRegionCode: this.data.tempRegionCode === code ? '' : code });
  },

  onPanelEducationTap(e: WechatMiniprogram.TouchEvent) {
    const code = (e.currentTarget.dataset as any).code as string;
    this.setData({ tempEducationCode: this.data.tempEducationCode === code ? '' : code });
  },

  onPanelMaritalTap(e: WechatMiniprogram.TouchEvent) {
    const code = (e.currentTarget.dataset as any).code as string;
    this.setData({ tempMaritalStatus: this.data.tempMaritalStatus === code ? '' : code });
  },

  onMinAgeChange(e: any) {
    let min = Number(e.detail.value);
    if (min > this.data.tempMaxAge) min = this.data.tempMaxAge;
    this.setData({ tempMinAge: min });
  },

  onMaxAgeChange(e: any) {
    let max = Number(e.detail.value);
    if (max < this.data.tempMinAge) max = this.data.tempMinAge;
    this.setData({ tempMaxAge: max });
  },

  onApplyFilter() {
    const a = this.data.applied;
    const applied: AppliedFilter = {
      keyword: a.keyword,
      regionCode: this.data.tempRegionCode,
      minAge: this.data.tempMinAge,
      maxAge: this.data.tempMaxAge,
      educationCode: this.data.tempEducationCode,
      maritalStatus: this.data.tempMaritalStatus,
    };
    this.setData({
      applied,
      hasActiveFilter: this._hasActiveFilter(applied),
      showFilter: false,
    });
    this.fetchDiscover(true);
  },

  onResetFilter() {
    const applied: AppliedFilter = {
      keyword: '',
      regionCode: '',
      minAge: DEFAULT_MIN_AGE,
      maxAge: DEFAULT_MAX_AGE,
      educationCode: '',
      maritalStatus: '',
    };
    this.setData({
      keywordInput: '',
      tempRegionCode: '',
      tempMinAge: DEFAULT_MIN_AGE,
      tempMaxAge: DEFAULT_MAX_AGE,
      tempEducationCode: '',
      tempMaritalStatus: '',
      applied,
      hasActiveFilter: false,
      showFilter: false,
    });
    this.fetchDiscover(true);
  },

  // ========== 卡片交互 ==========

  onViewDetail(e: WechatMiniprogram.TouchEvent) {
    const { userId } = (e.detail as any) || {};
    if (!userId) return;
    wx.navigateTo({ url: to.detail(userId) });
  },

  async onLike(e: WechatMiniprogram.TouchEvent) {
    const userId = (e.currentTarget.dataset as any).userId as string | undefined;
    if (!userId || this.data.actionLoadingUserId) return;
    this.setData({ actionLoadingUserId: userId });
    try {
      // @ts-ignore
      const result = await matchStore.like(userId);
      this.setData({ users: this.data.users.filter((u) => u.userId !== userId) });
      if (result?.mutualMatch) {
        appStore.toastSuccess('双向意向匹配成功，可查看公益服务');
      } else {
        appStore.toastSuccess('已表达喜欢');
      }
    } catch (err: unknown) {
      appStore.toastError(err instanceof Error ? err.message : '操作失败');
    } finally {
      this.setData({ actionLoadingUserId: '' });
    }
  },

  onPullDownRefresh() {
    this.fetchDiscover(true).finally(() => wx.stopPullDownRefresh());
  },

  onReachBottom() {
    this.loadMore();
  },
});