import { Injectable } from '@angular/core';
import { FmodeParse } from 'fmode-ng/parse';
import { IssueStatus, IssuePriority, IssueType } from '../../../../modules/project/services/project-issue.service';
import { TodoTaskFromIssue } from '../dashboard/dashboard.model';

@Injectable({
  providedIn: 'root'
})
export class TodoTaskService {

  constructor() { }

  /**
   * 从问题板块加载待办任务
   */
  async getTodoTasks(): Promise<TodoTaskFromIssue[]> {
    try {
      const Parse: any = FmodeParse.with('nova');
      const query = new Parse.Query('ProjectIssue');
      
      // 筛选条件：待处理 + 处理中
      query.containedIn('status', ['待处理', '处理中']);
      query.notEqualTo('isDeleted', true);
      
      // 关联数据
      query.include(['project', 'creator', 'assignee']);
      
      // 排序：更新时间倒序
      query.descending('updatedAt');
      
      // 限制数量
      query.limit(50);
      
      const results = await query.find();
      
      console.log(`📥 查询到 ${results.length} 条问题记录`);
      
      // 数据转换
      const tasks = await Promise.all(results.map(async (obj: any) => {
        let project = obj.get('project');
        const assignee = obj.get('assignee');
        const creator = obj.get('creator');
        const data = obj.get('data') || {};
        
        let projectName = '未知项目';
        let projectId = '';
        
        if (project) {
          projectId = project.id;
          projectName = project.get('name');
          
          if (!projectName && projectId) {
            try {
              const projectQuery = new Parse.Query('Project');
              const fetchedProject = await projectQuery.get(projectId);
              projectName = fetchedProject.get('name') || fetchedProject.get('title') || '未知项目';
            } catch (error) {
              console.warn(`⚠️ 无法加载项目 ${projectId}:`, error);
              projectName = `项目-${projectId.slice(0, 6)}`;
            }
          }
        } else {
          console.warn('⚠️ 问题缺少关联项目:', {
            issueId: obj.id,
            title: obj.get('title')
          });
        }
        
        return {
          id: obj.id,
          title: obj.get('title') || obj.get('description')?.slice(0, 40) || '未命名问题',
          description: obj.get('description'),
          priority: obj.get('priority') as IssuePriority || 'medium',
          type: obj.get('issueType') as IssueType || 'task',
          status: this.zh2enStatus(obj.get('status')) as IssueStatus,
          projectId,
          projectName,
          relatedSpace: obj.get('relatedSpace') || data.relatedSpace,
          relatedStage: obj.get('relatedStage') || data.relatedStage,
          assigneeName: assignee?.get('name') || assignee?.get('realname') || '未指派',
          creatorName: creator?.get('name') || creator?.get('realname') || '未知',
          createdAt: obj.createdAt || new Date(),
          updatedAt: obj.updatedAt || new Date(),
          dueDate: obj.get('dueDate'),
          tags: (data.tags || []) as string[]
        } as TodoTaskFromIssue;
      }));
      
      // 排序：优先级 -> 时间
      return tasks.sort((a, b) => {
        const priorityA = this.getPriorityOrder(a.priority);
        const priorityB = this.getPriorityOrder(b.priority);
        
        if (priorityA !== priorityB) {
          return priorityA - priorityB;
        }
        
        return +new Date(b.updatedAt) - +new Date(a.updatedAt);
      });
      
    } catch (error) {
      console.error('❌ 加载待办任务失败:', error);
      throw error;
    }
  }

  // 状态映射辅助方法
  private zh2enStatus(status: string): IssueStatus {
    const map: Record<string, IssueStatus> = {
      '待处理': 'open',
      '处理中': 'in_progress',
      '已解决': 'resolved',
      '已关闭': 'closed'
    };
    return map[status] || 'open';
  }
  
  private getPriorityOrder(priority: IssuePriority): number {
    const config: Record<IssuePriority, number> = {
      urgent: 0,
      critical: 0,
      high: 1,
      medium: 2,
      low: 3
    };
    return config[priority] || 2;
  }
}