import { Component, OnInit, OnDestroy } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { FormControl } from '@angular/forms';
import { Router } from '@angular/router';
import { debounceTime, distinctUntilChanged } from 'rxjs/operators';
import { CaseDetailPanelComponent, Case } from './case-detail-panel.component';
import { CaseService } from '../../../services/case.service';
import { ProjectAutoCaseService } from '../../admin/services/project-auto-case.service';

interface StatItem {
  id: string;
  name: string;
  shareCount: number;
}

interface StyleStat {
  style: string;
  count: number;
}

interface DesignerStat {
  designer: string;
  rate: number;
}

@Component({
  selector: 'app-case-library',
  standalone: true,
  imports: [CommonModule, FormsModule, ReactiveFormsModule, CaseDetailPanelComponent],
  templateUrl: './case-library.html',
  styleUrls: ['./case-library.scss']
})
export class CaseLibrary implements OnInit, OnDestroy {
  // 表单控件
  searchControl = new FormControl('');
  projectTypeControl = new FormControl('');
  spaceTypeControl = new FormControl('');
  renderingLevelControl = new FormControl('');
  styleControl = new FormControl('');
  areaRangeControl = new FormControl('');

  // 数据
  cases: Case[] = [];
  filteredCases: Case[] = [];
  
  // 统计数据
  topSharedCases: StatItem[] = [];
  favoriteStyles: StyleStat[] = [];
  designerRecommendations: DesignerStat[] = [];
  
  // 状态
  showStatsPanel = false;
  selectedCase: Case | null = null; // 用于详情面板
  selectedCaseForShare: Case | null = null; // 用于分享模态框
  currentPage = 1;
  itemsPerPage = 12; // 每页显示12个案例（3列x4行）
  totalPages = 1;
  totalCount = 0;
  loading = false;
  
  // 用户类型（模拟）
  isInternalUser = true; // 可根据实际用户权限设置
  
  // 行为追踪
  private pageStartTime = Date.now();
  private caseViewStartTimes = new Map<string, number>();

  constructor(
    private router: Router,
    private caseService: CaseService,
    private projectAutoCaseService: ProjectAutoCaseService
  ) {}

  /**
   * 计算封面图：优先使用交付执行上传的照片；
   * 过滤需求阶段图片（stage/requirements），否则回退到本地家装图片。
   */
  coverImageOf(caseItem: any): string {
    // 1. 检查是否有上传的交付执行图片（从 images 数组中查找真实上传的图片）
    const images = caseItem?.images || [];
    const uploadedImage = images.find((img: string) =>
      img &&
      img.startsWith('http') &&
      !img.includes('placeholder') &&
      !img.includes('unsplash.com') && // 排除默认的 Unsplash 图片
      !img.endsWith('.svg') &&
      // 只接受交付执行或其他实际上传文件，排除需求阶段图片
      !img.includes('/stage/requirements/') &&
      (img.includes('file-cloud.fmode.cn') || img.includes('storage'))
    );

    if (uploadedImage) {
      return uploadedImage;
    }

    // 2. 检查 coverImage 是否是真实上传的图片（同样排除需求阶段图片）
    const coverUrl: string = caseItem?.coverImage || '';
    const isRealUpload = !!(
      coverUrl &&
      coverUrl.startsWith('http') &&
      !coverUrl.includes('placeholder') &&
      !coverUrl.includes('unsplash.com') &&
      !coverUrl.endsWith('.svg') &&
      !coverUrl.includes('/stage/requirements/') &&
      (coverUrl.includes('file-cloud.fmode.cn') || coverUrl.includes('storage'))
    );

    if (isRealUpload) {
      return coverUrl;
    }

    // 3. 使用默认家装图片
    return '/assets/presets/家装图片.jpg';
  }

  async ngOnInit() {
    // 补齐可能遗漏的案例（幂等，不会重复创建）
    try {
      const result = await this.projectAutoCaseService.backfillMissingCases(10);
      if (result.created > 0) {
        console.log(`✅ 案例库补齐：新增 ${result.created}/${result.scanned}`);
      }
    } catch (e) {
      console.warn('⚠️ 案例库补齐失败（忽略）：', e);
    }

    this.loadCases(); // loadCases 会自动调用 loadStatistics
    this.setupFilterListeners();
    this.setupBehaviorTracking();
  }

  ngOnDestroy() {
    // 页面销毁时的清理工作
    console.log('案例库页面销毁');
  }
  
  private setupBehaviorTracking() {
    // 记录页面访问（可选）
    console.log('案例库页面已加载');
  }

  /**
   * 加载案例列表 - 只显示已完成项目的案例
   * 
   * 案例库显示条件（由CaseService严格验证）：
   * ✅ 项目必须进入"售后归档"阶段
   * ✅ 完成以下任意一项即可进入案例库：
   *    1. 完成尾款结算（全部支付或部分支付）
   *    2. 完成客户评价（ProjectFeedback）
   *    3. 完成项目复盘（project.data.retrospective）
   */
  async loadCases() {
    this.loading = true;
    try {
      const filters = this.getFilters();
      const result = await this.caseService.findCases({
        ...filters,
        isPublished: undefined, // 不筛选发布状态，显示所有已完成项目
        page: this.currentPage,
        pageSize: this.itemsPerPage
      });
      
      console.log(`📊 从Case表查询到 ${result.cases.length} 个有效案例（已在CaseService中验证）`);
      
      // 去重：同一项目只展示一个案例（按 projectId 去重，保留最新）
      const uniqueMap = new Map<string, any>();
      for (const c of result.cases) {
        if (!c.projectId) {
          // 无 projectId 的直接保留（极少数异常数据）
          uniqueMap.set(`__no_project__${c.id}`, c);
          continue;
        }
        if (!uniqueMap.has(c.projectId)) {
          uniqueMap.set(c.projectId, c);
        } else {
          // 保留 publishedAt 较新的
          const prev = uniqueMap.get(c.projectId);
          const prevTime = new Date(prev.publishedAt || prev.createdAt || 0).getTime();
          const curTime = new Date(c.publishedAt || c.createdAt || 0).getTime();
          if (curTime >= prevTime) {
            uniqueMap.set(c.projectId, c);
          }
        }
      }

      const uniqueCases = Array.from(uniqueMap.values());
      
      this.cases = uniqueCases;
      this.filteredCases = uniqueCases;
      this.totalCount = uniqueCases.length;
      this.totalPages = Math.ceil(uniqueCases.length / this.itemsPerPage) || 1;
      
      console.log(`✅ 案例库已加载 ${uniqueCases.length} 个有效案例（去重后）`);
      
      // 如果没有数据，显示友好提示
      if (uniqueCases.length === 0) {
        console.log('💡 暂无已完成项目案例，请确保有项目已进入"售后归档"阶段并完成以下任意一项：');
        console.log('   1. 完成尾款结算（全部支付或部分支付）');
        console.log('   2. 完成客户评价（ProjectFeedback）');
        console.log('   3. 完成项目复盘（project.data.retrospective）');
      }
      
      // 加载完案例后更新统计数据
      await this.loadStatistics();
    } catch (error) {
      console.error('❌ 加载案例列表失败:', error);
      // 即使出错也设置为空数组，避免页面崩溃
      this.cases = [];
      this.filteredCases = [];
      this.totalCount = 0;
      this.totalPages = 1;
      this.showToast('加载案例列表失败，请检查数据库连接', 'error');
    } finally {
      this.loading = false;
    }
  }

  /**
   * 加载统计数据
   */
  async loadStatistics() {
    try {
      // Top 5 分享案例
      const sortedByShare = [...this.cases]
        .filter(c => c.shareCount && c.shareCount > 0)
        .sort((a, b) => (b.shareCount || 0) - (a.shareCount || 0))
        .slice(0, 5);
      
      this.topSharedCases = sortedByShare.map(c => ({
        id: c.id,
        name: c.name,
        shareCount: c.shareCount || 0
      }));
      
      // 客户最喜欢风格 - 根据收藏数统计
      const styleStats: { [key: string]: number } = {};
      this.cases.forEach(c => {
        const tags = c.tag || c.styleTags || [];
        tags.forEach(tag => {
          styleStats[tag] = (styleStats[tag] || 0) + (c.favoriteCount || 0);
        });
      });
      
      this.favoriteStyles = Object.entries(styleStats)
        .sort((a, b) => b[1] - a[1])
        .slice(0, 5)
        .map(([style, count]) => ({ style, count }));
      
      // 设计师作品推荐率 - 简化计算
      const designerStats: { [key: string]: { total: number; recommended: number } } = {};
      this.cases.forEach(c => {
        const designer = c.designer || '未知设计师';
        if (!designerStats[designer]) {
          designerStats[designer] = { total: 0, recommended: 0 };
        }
        designerStats[designer].total++;
        if (c.isExcellent) {
          designerStats[designer].recommended++;
        }
      });
      
      this.designerRecommendations = Object.entries(designerStats)
        .map(([designer, stats]) => ({
          designer,
          rate: stats.total > 0 ? Math.round((stats.recommended / stats.total) * 100) : 0
        }))
        .sort((a, b) => b.rate - a.rate)
        .slice(0, 5);
      
      console.log('✅ 统计数据已加载:', {
        topSharedCases: this.topSharedCases.length,
        favoriteStyles: this.favoriteStyles.length,
        designerRecommendations: this.designerRecommendations.length
      });
    } catch (error) {
      console.error('❌ 加载统计数据失败:', error);
      this.topSharedCases = [];
      this.favoriteStyles = [];
      this.designerRecommendations = [];
    }
  }

  /**
   * 获取当前筛选条件
   */
  private getFilters() {
    const filters: any = {};

    const searchKeyword = this.searchControl.value?.trim();
    if (searchKeyword) {
      filters.searchKeyword = searchKeyword;
    }

    const projectType = this.projectTypeControl.value;
    if (projectType) {
      filters.projectType = projectType;
    }

    const spaceType = this.spaceTypeControl.value;
    if (spaceType) {
      filters.spaceType = spaceType;
    }

    const renderingLevel = this.renderingLevelControl.value;
    if (renderingLevel) {
      filters.renderingLevel = renderingLevel;
    }

    const style = this.styleControl.value;
    if (style) {
      // 使用tags数组进行筛选
      filters.tags = [style];
    }

    const areaRange = this.areaRangeControl.value;
    if (areaRange) {
      // 解析面积范围 "0-50" -> { min: 0, max: 50 }
      const [min, max] = areaRange.split('-').map(Number);
      filters.areaRange = { min, max: max || undefined };
    }

    return filters;
  }

  /**
   * 获取本月新增案例数
   */
  get monthlyNewCases(): number {
    const now = new Date();
    const thisMonthStart = new Date(now.getFullYear(), now.getMonth(), 1);
    
    return this.cases.filter(c => {
      const createdAt = new Date(c.createdAt);
      return createdAt >= thisMonthStart;
    }).length;
  }

  private setupFilterListeners() {
    // 搜索框防抖
    this.searchControl.valueChanges.pipe(
      debounceTime(300),
      distinctUntilChanged()
    ).subscribe(() => this.applyFilters());

    // 其他筛选条件变化
    [
      this.projectTypeControl,
      this.spaceTypeControl,
      this.renderingLevelControl,
      this.styleControl,
      this.areaRangeControl
    ].forEach(control => {
      control.valueChanges.subscribe(() => this.applyFilters());
    });
  }

  applyFilters() {
    this.currentPage = 1;
    this.loadCases();
  }

  resetFilters() {
    this.searchControl.setValue('');
    this.projectTypeControl.setValue('');
    this.spaceTypeControl.setValue('');
    this.renderingLevelControl.setValue('');
    this.styleControl.setValue('');
    this.areaRangeControl.setValue('');
    
    this.currentPage = 1;
    this.loadCases();
  }

  get paginatedCases(): Case[] {
    return this.filteredCases;
  }

  nextPage() {
    if (this.currentPage < this.totalPages) {
      this.currentPage++;
      this.loadCases();
    }
  }

  previousPage() {
    if (this.currentPage > 1) {
      this.currentPage--;
      this.loadCases();
    }
  }

  async viewCaseDetail(caseItem: Case) {
    // 记录案例查看开始时间
    this.caseViewStartTimes.set(caseItem.id, Date.now());
    
    try {
      // 从数据库获取完整的案例详情
      const detail = await this.caseService.getCase(caseItem.id);
      
      // 设置当前选中的案例以显示详情面板
      this.selectedCase = detail;
    } catch (error) {
      console.error('查看案例详情失败:', error);
      this.showToast('查看案例详情失败', 'error');
    }
  }

  // 跳转到独立的案例详情页面
  async navigateToCaseDetail(caseItem: Case) {
    // 记录案例查看开始时间
    this.caseViewStartTimes.set(caseItem.id, Date.now());
    
    // 跳转到独立的案例详情页面
    this.router.navigate(['/customer-service/case-detail', caseItem.id]);
  }

  closeCaseDetail() {
    this.selectedCase = null;
  }

  async toggleFavorite(caseItem: Case) {
    try {
      // 暂时只切换前端状态，后续可添加收藏功能
      caseItem.isFavorite = !caseItem.isFavorite;
      
      if (caseItem.isFavorite) {
        this.showToast('已收藏该案例', 'success');
      } else {
        this.showToast('已取消收藏', 'info');
      }
    } catch (error) {
      console.error('切换收藏状态失败:', error);
      this.showToast('操作失败，请重试', 'error');
    }
  }

  async shareCase(caseItem: Case) {
    this.selectedCaseForShare = caseItem;
  }

  closeShareModal() {
    this.selectedCaseForShare = null;
  }

  generateQRCode(caseItem: Case): string {
    // 实际项目中应使用二维码生成库，如 qrcode.js
    const qrData = this.generateShareLink(caseItem);
    // 这里返回一个模拟的二维码图片
    const svgContent = `
      <svg width="200" height="200" xmlns="http://www.w3.org/2000/svg">
        <rect width="200" height="200" fill="white"/>
        <rect x="20" y="20" width="160" height="160" fill="black"/>
        <rect x="30" y="30" width="140" height="140" fill="white"/>
        <text x="100" y="105" text-anchor="middle" font-size="12" fill="black">案例二维码</text>
        <text x="100" y="125" text-anchor="middle" font-size="10" fill="gray">${caseItem.name}</text>
      </svg>
    `;
    // 使用 encodeURIComponent 来正确处理SVG内容
    const encodedSVG = encodeURIComponent(svgContent);
    return `data:image/svg+xml;charset=utf-8,${encodedSVG}`;
  }

  generateShareLink(caseItem: Case): string {
    return `${window.location.origin}/customer-service/case-detail/${caseItem.id}?from=share&designer=${encodeURIComponent(caseItem.designer)}`;
  }

  async copyShareLink() {
    if (this.selectedCaseForShare) {
      try {
        const shareUrl = this.generateShareLink(this.selectedCaseForShare);
        await navigator.clipboard.writeText(shareUrl);
        this.showToast('链接已复制到剪贴板，可直接分享给客户！', 'success');
      } catch (err) {
        this.showToast('复制失败，请手动复制链接', 'error');
        console.error('复制链接失败:', err);
      }
    }
  }

  async shareToWeCom() {
    if (this.selectedCaseForShare) {
      try {
        const shareUrl = this.generateShareLink(this.selectedCaseForShare);
        
        // 实际项目中应集成企业微信分享SDK
        const shareData = {
          title: `${this.selectedCaseForShare.name} - ${this.selectedCaseForShare.designer}设计作品`,
          description: `${this.selectedCaseForShare.projectType} | ${this.selectedCaseForShare.spaceType} | ${this.selectedCaseForShare.area}㎡`,
          link: shareUrl,
          imgUrl: this.selectedCaseForShare.coverImage
        };
        
        // 模拟企业微信分享
        console.log('分享到企业微信:', shareData);
        this.showToast('已调用企业微信分享', 'success');
        
        this.closeShareModal();
      } catch (error) {
        console.error('分享失败:', error);
        this.showToast('分享失败，请重试', 'error');
      }
    }
  }

  showStatistics() {
    this.showStatsPanel = !this.showStatsPanel;
    if (this.showStatsPanel) {
      this.loadStatistics();
    }
  }

  // ========== 案例已完成项目展示功能（只读） ==========
  // 移除了手动创建、编辑、删除功能
  // 案例由项目自动创建，只提供查看和分享功能

  // 显示提示消息
  private showToast(message: string, type: 'success' | 'error' | 'info' = 'info') {
    // 实际项目中应使用专业的Toast组件
    const toast = document.createElement('div');
    toast.className = `toast toast-${type}`;
    toast.textContent = message;
    toast.style.cssText = `
      position: fixed;
      top: 20px;
      right: 20px;
      padding: 12px 20px;
      border-radius: 8px;
      color: white;
      font-weight: 500;
      z-index: 10000;
      animation: slideIn 0.3s ease;
      background: ${type === 'success' ? '#10b981' : type === 'error' ? '#ef4444' : '#3b82f6'};
    `;
    
    document.body.appendChild(toast);
    
    setTimeout(() => {
      toast.style.animation = 'slideOut 0.3s ease';
      setTimeout(() => document.body.removeChild(toast), 300);
    }, 3000);
  }
}