/**
 * RVW审稿系统 - 主Dashboard页面
 */
import { useState, useEffect, useCallback } from 'react';
import { message } from 'antd';
import {
  Sidebar,
  Header,
  FilterChips,
  TaskTable,
  BatchToolbar,
  AgentModal,
  ReportDetail,
  TaskDetail,
} from '../components';
import * as api from '../api';
import type { ReviewTask, ReviewReport, TaskFilters, AgentType } from '../types';
import '../styles/index.css';

export default function Dashboard() {
  // ==================== State ====================
  const [currentView, setCurrentView] = useState<'dashboard' | 'archive'>('dashboard');
  const [tasks, setTasks] = useState<ReviewTask[]>([]);
  const [loading, setLoading] = useState(true);
  const [selectedIds, setSelectedIds] = useState<string[]>([]);
  const [filters, setFilters] = useState<TaskFilters>({ status: 'all', timeRange: 'all' });
  const [agentModalVisible, setAgentModalVisible] = useState(false);
  const [pendingTaskForRun, setPendingTaskForRun] = useState<ReviewTask | null>(null);
  
  // 报告详情
  const [reportDetail, setReportDetail] = useState<ReviewReport | null>(null);
  
  // 任务详情（支持进度显示）
  const [viewingTask, setViewingTask] = useState<ReviewTask | null>(null);
  const [currentJobId, setCurrentJobId] = useState<string | null>(null);

  // ==================== 数据加载 ====================
  const loadTasks = useCallback(async () => {
    try {
      setLoading(true);
      const data = await api.getTasks(filters.status !== 'all' ? filters.status : undefined);
      
      // 时间筛选
      let filtered = data;
      if (filters.timeRange === 'today') {
        const today = new Date().toDateString();
        filtered = data.filter(t => new Date(t.createdAt).toDateString() === today);
      } else if (filters.timeRange === 'week') {
        const weekAgo = Date.now() - 7 * 24 * 60 * 60 * 1000;
        filtered = data.filter(t => new Date(t.createdAt).getTime() > weekAgo);
      }
      
      setTasks(filtered);
    } catch (error) {
      console.error('加载任务失败:', error);
      message.error('加载任务列表失败');
    } finally {
      setLoading(false);
    }
  }, [filters]);

  useEffect(() => {
    loadTasks();
  }, [loadTasks]);

  // 轮询更新进行中的任务
  useEffect(() => {
    const processingTasks = tasks.filter(t => 
      t.status === 'extracting' || t.status === 'reviewing'
    );
    
    if (processingTasks.length === 0) return;

    const interval = setInterval(async () => {
      for (const task of processingTasks) {
        try {
          const updated = await api.getTask(task.id);
          setTasks(prev => prev.map(t => t.id === updated.id ? updated : t));
        } catch (error) {
          console.error('更新任务状态失败:', error);
        }
      }
    }, 3000);

    return () => clearInterval(interval);
  }, [tasks]);

  // ==================== 统计数据 ====================
  const counts = {
    all: tasks.length,
    pending: tasks.filter(t => t.status === 'pending').length,
    completed: tasks.filter(t => t.status === 'completed').length,
  };

  // ==================== 事件处理 ====================
  const handleUpload = async (files: FileList) => {
    const uploadPromises = Array.from(files).map(async (file) => {
      try {
        message.loading({ content: `正在上传 ${file.name}...`, key: file.name });
        await api.uploadManuscript(file);
        message.success({ content: `${file.name} 上传成功`, key: file.name, duration: 2 });
      } catch (error: any) {
        message.error({ content: `${file.name} 上传失败: ${error.message}`, key: file.name, duration: 3 });
      }
    });

    await Promise.all(uploadPromises);
    loadTasks();
  };

  const handleRunTask = (task: ReviewTask) => {
    setPendingTaskForRun(task);
    setAgentModalVisible(true);
  };

  const handleRunBatch = () => {
    setPendingTaskForRun(null); // 批量模式
    setAgentModalVisible(true);
  };

  const handleConfirmRun = async (agents: AgentType[]) => {
    // 🔥 保存到局部变量，避免onClose后丢失
    const taskToRun = pendingTaskForRun;
    
    // 立即关闭弹窗
    setAgentModalVisible(false);
    setPendingTaskForRun(null);
    
    try {
      if (taskToRun) {
        // 单个任务 - 启动后跳转到详情页显示进度
        message.loading({ content: '正在启动审查...', key: 'run' });
        const { jobId } = await api.runTask(taskToRun.id, agents);
        message.success({ content: '审查已启动', key: 'run', duration: 2 });
        
        // 更新任务状态后跳转到详情页（传递jobId）
        const updatedTask = await api.getTask(taskToRun.id);
        setCurrentJobId(jobId);
        setViewingTask(updatedTask);
        return;
      } else {
        // 批量任务
        const pendingIds = selectedIds.filter(id => {
          const task = tasks.find(t => t.id === id);
          return task && task.status === 'pending';
        });
        
        if (pendingIds.length === 0) {
          message.warning('没有待处理的任务');
          return;
        }
        
        message.loading({ content: `正在启动 ${pendingIds.length} 个任务...`, key: 'run' });
        await api.batchRunTasks(pendingIds, agents);
        message.success({ content: `${pendingIds.length} 个任务已启动`, key: 'run', duration: 2 });
        setSelectedIds([]);
      }
      
      loadTasks();
    } catch (error: any) {
      message.error({ content: error.message || '启动失败', key: 'run', duration: 3 });
    }
  };

  const handleViewReport = async (task: ReviewTask) => {
    // 直接使用TaskDetail视图（支持进度和报告）
    setViewingTask(task);
  };

  const handleDeleteTask = async (task: ReviewTask) => {
    if (!window.confirm(`确定要删除 "${task.fileName}" 吗？`)) {
      return;
    }
    
    try {
      message.loading({ content: '正在删除...', key: 'delete' });
      await api.deleteTask(task.id);
      message.success({ content: '删除成功', key: 'delete', duration: 2 });
      loadTasks();
    } catch (error: any) {
      message.error({ content: error.message || '删除失败', key: 'delete', duration: 3 });
    }
  };

  const handleBackToList = () => {
    setReportDetail(null);
  };

  // 返回列表并刷新
  const handleBackFromDetail = () => {
    setViewingTask(null);
    setCurrentJobId(null);
    loadTasks();
  };

  // ==================== 渲染 ====================
  
  // 任务详情视图（支持进度显示）
  if (viewingTask) {
    return (
      <div className="h-full flex overflow-hidden bg-slate-50">
        <Sidebar 
          currentView={currentView} 
          onViewChange={setCurrentView}
        />
        <TaskDetail task={viewingTask} jobId={currentJobId} onBack={handleBackFromDetail} />
      </div>
    );
  }
  
  // 报告详情视图（旧版，保留兼容）
  if (reportDetail) {
    return (
      <div className="h-full flex overflow-hidden bg-slate-50">
        <Sidebar 
          currentView={currentView} 
          onViewChange={setCurrentView}
        />
        <ReportDetail report={reportDetail} onBack={handleBackToList} />
      </div>
    );
  }

  // 主仪表盘视图
  return (
    <div className="h-full flex overflow-hidden bg-slate-50">
      <Sidebar 
        currentView={currentView} 
        onViewChange={setCurrentView}
      />
      
      <main className="flex-1 flex flex-col min-w-0 bg-white">
        <div className="flex-1 flex flex-col h-full relative fade-in">
          {/* 顶部操作区 */}
          <header className="bg-white px-8 pt-6 pb-4 border-b border-gray-100 flex-shrink-0 z-10">
            <Header onUpload={handleUpload} />
            <FilterChips 
              filters={filters} 
              counts={counts}
              onFilterChange={setFilters} 
            />
          </header>

          {/* 列表区域 */}
          <div className="flex-1 overflow-auto bg-slate-50/50 p-6">
            {loading ? (
              <div className="flex items-center justify-center h-64">
                <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-indigo-600" />
              </div>
            ) : (
              <TaskTable
                tasks={tasks}
                selectedIds={selectedIds}
                onSelectChange={setSelectedIds}
                onViewReport={handleViewReport}
                onRunTask={handleRunTask}
                onDeleteTask={handleDeleteTask}
              />
            )}
          </div>
        </div>
      </main>

      {/* 批量操作工具栏 */}
      <BatchToolbar
        selectedCount={selectedIds.length}
        onRunBatch={handleRunBatch}
        onClearSelection={() => setSelectedIds([])}
      />

      {/* 智能体选择弹窗 */}
      <AgentModal
        visible={agentModalVisible}
        taskCount={pendingTaskForRun ? 1 : selectedIds.length}
        onClose={() => {
          setAgentModalVisible(false);
          setPendingTaskForRun(null);
        }}
        onConfirm={handleConfirmRun}
      />
    </div>
  );
}