import { Component, Input, OnInit } from '@angular/core';
import { CommonModule } from '@angular/common';
import { MatIconModule } from '@angular/material/icon';
import { MatExpansionModule } from '@angular/material/expansion';
import { MatButtonModule } from '@angular/material/button';
import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';
import { MatTooltipModule } from '@angular/material/tooltip';
import { DocumentSession, DocumentType, DocumentTypeDisplayName, DocumentTypeIcon, getDocumentTypeOrder } from '../models/document.model';
import { MarkdownPipe } from '../shared/pipes/markdown.pipe';

@Component({
  selector: 'app-document-list',
  standalone: true,
  imports: [
    CommonModule,
    MatIconModule,
    MatExpansionModule,
    MatButtonModule,
    MatProgressSpinnerModule,
    MatTooltipModule,
    MarkdownPipe
  ],
  templateUrl: './document-list.component.html',
  styleUrl: './document-list.component.scss'
})
export class DocumentListComponent implements OnInit {
  @Input() documents: DocumentSession[] = [];
  @Input() defaultExpanded: boolean = false;
  
  // 按固定顺序排序的文档类型
  documentTypeOrder = getDocumentTypeOrder();
  
  // 控制每个文档的展开状态
  expandedStates: Record<DocumentType, boolean> = {
    [DocumentType.UserRequirement]: false,
    [DocumentType.Requirement]: false,
    [DocumentType.Technical]: false,
    [DocumentType.Implementation]: false,
    [DocumentType.Test]: false
  };
  
  ngOnInit() {
    // 初始化展开状态
    if (this.defaultExpanded) {
      this.documentTypeOrder.forEach(docType => {
        this.expandedStates[docType] = true;
      });
    }
  }
  
  /**
   * 获取指定类型的文档
   */
  getDocumentByType(docType: DocumentType): DocumentSession | undefined {
    return this.documents.find(doc => doc.type === docType);
  }
  
  /**
   * 切换文档的展开状态
   */
  toggleDocument(docType: DocumentType) {
    this.expandedStates[docType] = !this.expandedStates[docType];
  }
  
  /**
   * 获取文档显示名称
   */
  getDisplayName(docType: DocumentType): string {
    return DocumentTypeDisplayName[docType];
  }
  
  /**
   * 获取文档图标
   */
  getIcon(docType: DocumentType): string {
    return DocumentTypeIcon[docType];
  }
  
  /**
   * 检查文档是否有内容
   */
  hasContent(doc: DocumentSession): boolean {
    return !!doc.hasContent && !!doc.content && doc.content.trim().length > 0;
  }
  
  /**
   * 获取文档最后更新时间显示文本
   */
  getLastUpdatedText(doc: DocumentSession): string {
    if (!doc.lastUpdated) return '';
    
    const now = new Date();
    const diffMs = now.getTime() - doc.lastUpdated.getTime();
    const diffMins = Math.floor(diffMs / (1000 * 60));
    const diffHours = Math.floor(diffMs / (1000 * 60 * 60));
    const diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));
    
    if (diffMins < 60) {
      return `${diffMins}分钟前`;
    } else if (diffHours < 24) {
      return `${diffHours}小时前`;
    } else {
      return `${diffDays}天前`;
    }
  }
  
  /**
   * 格式化内容长度，用于预览
   */
  getContentPreview(content: string): string {
    if (!content) return '暂无内容';
    
    const maxLength = 100;
    const plainText = content.replace(/[#\*`]/g, '').replace(/\n/g, ' ');
    
    if (plainText.length <= maxLength) {
      return plainText;
    }
    
    return plainText.substring(0, maxLength) + '...';
  }
}