import { Component, OnInit, inject, signal } from '@angular/core';
import { Router } from '@angular/router';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import {
  faChartPie, faUsers, faBolt, faHeartPulse,
  faTriangleExclamation, faChartLine, faChartBar, faUserGroup, faMapLocationDot
} from '@fortawesome/free-solid-svg-icons';
import { PageHeaderComponent } from '../../shared/components/page-header/page-header.component';
import { StatCardComponent } from '../../shared/components/stat-card/stat-card.component';
import { ChartCardComponent } from '../../shared/components/chart-card/chart-card.component';
import { DataTableComponent } from '../../shared/components/data-table/data-table.component';
import {
  StoreScopePickerComponent,
  type StoreScopeSelection,
} from '../../shared/components/store-scope-picker/store-scope-picker.component';
import {
  ScopeBreadcrumbComponent,
  type DashboardScopeSelection,
  type DashboardScopeGroupOption,
} from '../../shared/components/scope-breadcrumb/scope-breadcrumb.component';
import { AuthStore } from '../../core/auth/auth.store';
import { ParseDataService, type ParseStore } from '../../core/services/api/parse-data.service';

import { isDirector, isRegionalSupervisor } from '../../core/models/role.constants';
import type { Group, RiskEvent } from '../../core/models';
import type { ChartData } from 'chart.js';
import {
  buildDefaultStoreScope,
  buildSupervisorDefaultScope,
  buildLockedStoreScope,
  dashboardScopeToQuery,
} from './dashboard-scope.util';

@Component({
  selector: 'app-dashboard',
  standalone: true,
  imports: [
    FaIconComponent,
    PageHeaderComponent,
    StoreScopePickerComponent,
    ScopeBreadcrumbComponent,
    StatCardComponent,
    ChartCardComponent,
    DataTableComponent,
  ],
  templateUrl: './dashboard.component.html',
})
export class DashboardComponent implements OnInit {
  private readonly router = inject(Router);
  private readonly authStore = inject(AuthStore);
  private readonly parseData = inject(ParseDataService);

  protected readonly faChartPie = faChartPie;
  protected readonly faUsers = faUsers;
  protected readonly faUserGroup = faUserGroup;
  protected readonly faBolt = faBolt;
  protected readonly faHeartPulse = faHeartPulse;
  protected readonly faTriangleExclamation = faTriangleExclamation;
  protected readonly faChartLine = faChartLine;
  protected readonly faChartBar = faChartBar;
  protected readonly faMapLocationDot = faMapLocationDot;

  loading = true;
  showDashboardScopePicker = false;
  showStoreScopePicker = false;
  showGlobalScopeOption = true;
  showRegionScopeOption = false;
  regionScopeLabel = '区域汇总（一级）';
  scopeSubtitle = '';

  storeScopeOptions: Array<{ id: string; name: string; region?: string }> = [];
  storeScopeSelection: StoreScopeSelection = { level: 'store', label: '加载中…' };

  dashboardDistricts: string[] = [];
  dashboardStoresByDistrict: Record<string, { id: string; name: string }[]> = {};
  dashboardGroupsByDistrict: Record<string, DashboardScopeGroupOption[]> = {};
  dashboardScopeSelection: DashboardScopeSelection = { level: 'city', label: '全上海' };

  stats = {
    totalGroups: 0,
    totalMembers: 0,
    activeGroupRate: 0,
    avgHealthScore: 0,
    riskEventCount: 0,
  };

  activityChartData: ChartData<'doughnut'> = { labels: [], datasets: [] };
  lifecycleChartData: ChartData<'bar'> = { labels: [], datasets: [] };
  storeChartData: ChartData<'bar'> = { labels: [], datasets: [] };

  recentRiskEvents: RiskEvent[] = [];
  topGroups: Group[] = [];

  readonly riskEventColumns = [
    { key: 'title', label: '事件标题', sortable: true },
    { key: 'groupName', label: '所属群' },
    { key: 'severity', label: '严重等级', template: 'status' as const },
    { key: 'status', label: '状态', template: 'status' as const },
    { key: 'discoveredAt', label: '发现时间' },
    { key: 'actions', label: '操作', template: 'action' as const, width: '120px' }
  ];

  readonly topGroupColumns = [
    { key: 'name', label: '群名称', sortable: true },
    { key: 'communityName', label: '所属小区' },
    { key: 'healthGrade', label: '评级', template: 'status' as const },
    { key: 'messageCountToday', label: '今日消息数', sortable: true },
    { key: 'actions', label: '操作', template: 'action' as const, width: '120px' }
  ];

  protected readonly dashboardSubtitle = () => `数据来自 Parse · ${this.scopeSubtitle}`;

  ngOnInit(): void {
    const user = this.authStore.user();

    this.showDashboardScopePicker = isDirector(user?.role);
    this.showStoreScopePicker = isRegionalSupervisor(user?.role);
    this.showGlobalScopeOption = false;
    this.showRegionScopeOption = isRegionalSupervisor(user?.role);
    const districtLabel = user?.districtName || user?.regionCode || '';
    this.regionScopeLabel = districtLabel ? `${districtLabel}汇总（一级）` : '区域汇总（一级）';

    if (this.showDashboardScopePicker) {
      this.dashboardScopeSelection = { level: 'city', label: '全上海' };
    } else if (this.showStoreScopePicker) {
      this.storeScopeSelection = { level: 'store', label: '加载门店…' };
    } else {
      this.storeScopeSelection = buildLockedStoreScope(user);
      this.scopeSubtitle = this.storeScopeSelection.label;
    }
    void this.loadData();
  }

  protected onStoreScopeChange(scope: StoreScopeSelection): void {
    this.storeScopeSelection = scope;
    void this.loadData();
  }

  protected onDashboardScopeChange(scope: DashboardScopeSelection): void {
    this.dashboardScopeSelection = scope;
    void this.loadData();
  }

  private async loadData(): Promise<void> {
    this.loading = true;
    const user = this.authStore.user();

    const data = await this.parseData.getDashboardOverview();

    // 缓存原始数据
    this.dashboardDistricts = data.districts;
    this.dashboardStoresByDistrict = data.storesByDistrict;
    this.dashboardGroupsByDistrict = data.groupsByDistrict;

    // 根据 scope 过滤 groups 并重算 stats/charts
    const filteredGroups = this.filterGroupsByScope(data.allGroups, this.dashboardScopeSelection);
    this.recomputeFromGroups(filteredGroups);

    // 门店选择器数据
    if (this.showStoreScopePicker && data.stores?.length) {
      const supervisorId = user?.districtId || '';
      const accessible = isRegionalSupervisor(user?.role)
        ? data.stores.filter((s) => s.districtId === user!.districtId)
        : data.stores;
      this.storeScopeOptions = accessible.map((s) => ({ id: s.id, name: s.name, region: s.districtName }));
      if (this.storeScopeSelection.level !== 'global'
        && this.storeScopeSelection.level !== 'region'
        && !this.storeScopeSelection.storeId) {
        this.storeScopeSelection = isRegionalSupervisor(user?.role)
          ? buildSupervisorDefaultScope(user!, accessible.map((s) => ({ id: s.id, name: s.name, districtId: s.districtId, districtName: s.districtName } as ParseStore)))
          : buildDefaultStoreScope(accessible.map((s) => ({ id: s.id, name: s.name, districtId: s.districtId, districtName: s.districtName } as ParseStore)));
      }
    }

    this.scopeSubtitle = this.showDashboardScopePicker
      ? this.dashboardScopeSelection.label
      : this.storeScopeSelection.label;

    // 查询 RiskEvent，按当前 dashboard scope 过滤
    try {
      const scoped = await this.parseData.listRiskEvents();
      let filtered = scoped;
      if (this.dashboardScopeSelection.level === 'district') {
        const storeIds = (this.dashboardStoresByDistrict[this.dashboardScopeSelection.district!] || []).map(s => s.id);
        const idSet = new Set(storeIds);
        filtered = scoped.filter(e => idSet.has(e.store?.id || ''));
      } else if (this.dashboardScopeSelection.level === 'store') {
        filtered = scoped.filter(e => e.store?.id === this.dashboardScopeSelection.storeId);
      }
      this.recentRiskEvents = filtered
        .sort((a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime())
        .slice(0, 5);
      const pendingCount = filtered.filter(e => e.status === 'pending').length;
      this.stats = { ...this.stats, riskEventCount: pendingCount };
    } catch {
      this.recentRiskEvents = [];
      this.stats = { ...this.stats, riskEventCount: 0 };
    }

    this.loading = false;
  }

  protected onRiskEventClick(event: RiskEvent): void {
    this.router.navigate(['/risk-control'], { queryParams: { eventId: event.id } });
  }

  protected onGroupClick(event: Group): void {
    this.router.navigate(['/groups', event.id]);
  }

  protected navigateTo(path: string): void {
    this.router.navigate([path]);
  }

  /** 根据 scope 在前端过滤 groups */
  private filterGroupsByScope(allGroups: Group[], scope: DashboardScopeSelection): Group[] {
    switch (scope.level) {
      case 'city':
        return allGroups;
      case 'district': {
        const storeIds = (this.dashboardStoresByDistrict[scope.district!] || []).map(s => s.id);
        const idSet = new Set(storeIds);
        return allGroups.filter(g => idSet.has(g.storeId));
      }
      case 'store':
        return allGroups.filter(g => g.storeId === scope.storeId);
      case 'group':
        return allGroups.filter(g => g.id === scope.roomId);
      default:
        return allGroups;
    }
  }

  /** 从 groups 列表重新计算 stats + charts + tables */
  private recomputeFromGroups(groups: Group[]): void {
    const totalGroups = groups.length;
    const totalMembers = groups.reduce((sum, g) => sum + g.memberCount, 0);
    const activeCount = groups.filter(g => g.activityLevel === 'high' || g.activityLevel === 'medium').length;
    const avgHealth = totalGroups > 0
      ? Math.round(groups.reduce((sum, g) => sum + g.healthScore, 0) / totalGroups)
      : 0;

    this.stats = {
      ...this.stats,
      totalGroups,
      totalMembers,
      activeGroupRate: totalGroups > 0 ? Math.round((activeCount / totalGroups) * 100) : 0,
      avgHealthScore: avgHealth,
    };

    /* activity chart */
    const high = groups.filter(g => g.activityLevel === 'high').length;
    const medium = groups.filter(g => g.activityLevel === 'medium').length;
    const low = groups.filter(g => g.activityLevel === 'low').length;
    this.activityChartData = {
      labels: ['高活跃', '中活跃', '低活跃'],
      datasets: [{ data: [high, medium, low], backgroundColor: ['#188918', '#0070F2', '#E76500'], borderWidth: 0 }],
    };

    /* lifecycle chart */
    const lifecycleMap = new Map<string, number>();
    for (const p of ['pre_handover', 'near_handover', 'post_handover', 'legacy']) {
      lifecycleMap.set(p, groups.filter(g => g.lifecyclePhase === p).length);
    }
    this.lifecycleChartData = {
      labels: ['交房前', '临交房', '已交房', '老小区'],
      datasets: [{ label: '客户群数', data: Array.from(lifecycleMap.values()), backgroundColor: ['#0070F2', '#E76500', '#188918', '#8D8D90'], borderRadius: 4 }],
    };

    /* top groups */
    this.topGroups = [...groups].sort((a, b) => healthGradeRank(b.healthGrade) - healthGradeRank(a.healthGrade)).slice(0, 5);

    /* store comparison chart — depends on level */
    if (this.dashboardScopeSelection.level === 'city') {
      const storeMap = new Map<string, number>();
      groups.forEach(g => { if (g.storeName && g.storeName !== '—') storeMap.set(g.storeName, (storeMap.get(g.storeName) || 0) + 1); });
      this.storeChartData = {
        labels: Array.from(storeMap.keys()),
        datasets: [{ label: '客户群数量', data: Array.from(storeMap.values()), backgroundColor: ['#0070F2', '#188918', '#E76500', '#8D8D90', '#5B738B'], borderRadius: 4 }],
      };
    } else if (this.dashboardScopeSelection.level === 'district') {
      const district = this.dashboardScopeSelection.district!;
      const stores = this.dashboardStoresByDistrict[district] || [];
      const storeMap = new Map<string, number>();
      const storeIds = new Set(stores.map(s => s.id));
      groups.forEach(g => { if (storeIds.has(g.storeId)) storeMap.set(g.storeName || g.storeId, (storeMap.get(g.storeName || g.storeId) || 0) + 1); });
      this.storeChartData = {
        labels: Array.from(storeMap.keys()),
        datasets: [{ label: '客户群数量', data: Array.from(storeMap.values()), backgroundColor: ['#0070F2', '#188918', '#E76500', '#8D8D90', '#5B738B'], borderRadius: 4 }],
      };
    } else {
      // store / group 级别：只展示当前范围内的群分布
      const label = this.dashboardScopeSelection.storeName || this.dashboardScopeSelection.label;
      this.storeChartData = {
        labels: [label],
        datasets: [{ label: '客户群数量', data: [groups.length], backgroundColor: ['#0070F2'], borderRadius: 4 }],
      };
    }
  }
}

const GRADE_ORDER: Record<string, number> = { 'A': 5, 'B': 4, 'C': 3, 'D': 2, 'E': 1 };

function healthGradeRank(grade: string | undefined): number {
  return GRADE_ORDER[grade ?? ''] ?? 0;
}