'use client';

import { useState, useMemo, useEffect } from 'react';
import { Plus, Code2, Trash2 } from 'lucide-react';
import { useDevTaskStore } from '@/stores/useDevTaskStore';
import { useTaskCategoryStore } from '@/stores/useTaskCategoryStore';
import { useTaskWorklogStore } from '@/stores/useTaskWorklogStore';
import { useRequirementStore } from '@/stores/useRequirementStore';
import { useMemberStore } from '@/stores/useMemberStore';
import { useAuthStore } from '@/stores/useAuthStore';
import { DevTaskRow } from './DevTaskRow';
import { DevTaskCreateModal } from './DevTaskCreateModal';
import { DevTaskDetailDrawer } from './DevTaskDetailDrawer';
import { calcGroupProgress, DEV_TASK_STATUS_LABEL } from '@/lib/dev-task';
import { Pagination, usePagination } from '@/components/Pagination';
import type { DevTask, DevTaskStatus } from '@/lib/dev-task';

interface Props {
  versionId: string;
  requirementIds: string[];
  versionDeadline?: string;
}

export function DevTaskTab({ versionId, requirementIds, versionDeadline }: Props) {
  const { tasks, fetchTasks, deleteTask } = useDevTaskStore();
  const { categories, fetchCategories } = useTaskCategoryStore();
  const { fetchWorklogs } = useTaskWorklogStore();
  const { requirements } = useRequirementStore();
  const { members } = useMemberStore();
  const user = useAuthStore((s) => s.user);

  useEffect(() => { fetchTasks(); }, [fetchTasks]);
  useEffect(() => { fetchCategories(); }, [fetchCategories]);
  useEffect(() => { fetchWorklogs(); }, [fetchWorklogs]);

  const versionTasks = useMemo(
    () => tasks.filter((t) => requirementIds.includes(t.requirementId)),
    [tasks, requirementIds],
  );

  // 筛选
  const [filterAssignee, setFilterAssignee] = useState('');
  const [filterStatus, setFilterStatus] = useState('');
  const [filterBlocked, setFilterBlocked] = useState('');
  const [filterCategory, setFilterCategory] = useState('');

  const filteredTasks = useMemo(() => {
    let result = versionTasks;
    if (filterAssignee) result = result.filter((t) => t.assigneeId === filterAssignee);
    if (filterStatus) result = result.filter((t) => t.status === filterStatus);
    if (filterBlocked === 'yes') result = result.filter((t) => t.isBlocked);
    if (filterBlocked === 'no') result = result.filter((t) => !t.isBlocked);
    if (filterCategory) result = result.filter((t) => t.categoryId === filterCategory);
    return result;
  }, [versionTasks, filterAssignee, filterStatus, filterBlocked, filterCategory]);

  const { paged, page, setPage, total, pageSize, setPageSize } = usePagination(filteredTasks, 20);

  const progress = calcGroupProgress(versionTasks);
  const totalEstimate = versionTasks.reduce((s, t) => s + t.estimateHours, 0);
  const blockedCount = versionTasks.filter((t) => t.isBlocked).length;

  const [showCreate, setShowCreate] = useState(false);
  const [selectedTaskId, setSelectedTaskId] = useState<string | null>(null);

  // 批量选择
  const [selectedIds, setSelectedIds] = useState<Set<string>>(new Set());
  const isAllSelected = paged.length > 0 && paged.every((t) => selectedIds.has(t.id));

  const toggleSelect = (id: string) => {
    const next = new Set(selectedIds);
    if (next.has(id)) next.delete(id); else next.add(id);
    setSelectedIds(next);
  };
  const toggleAll = () => {
    setSelectedIds(isAllSelected ? new Set() : new Set(paged.map((t) => t.id)));
  };
  const handleBatchDelete = () => {
    if (selectedIds.size === 0) return;
    if (!confirm(`确定删除选中的 ${selectedIds.size} 个任务？`)) return;
    selectedIds.forEach((id) => deleteTask(id));
    setSelectedIds(new Set());
  };

  const groupedByReq = useMemo(() => {
    const map = new Map<string, DevTask[]>();
    for (const t of paged) {
      const list = map.get(t.requirementId) || [];
      list.push(t);
      map.set(t.requirementId, list);
    }
    return map;
  }, [paged]);

  const assignees = useMemo(() => Array.from(new Set(versionTasks.map((t) => t.assigneeId))), [versionTasks]);
  const hasFilter = !!(filterAssignee || filterStatus || filterBlocked || filterCategory);

  return (
    <div className="space-y-3">
      {/* 工具栏：进度 + 筛选 + 操作 合为一行 */}
      <div className="flex items-center gap-2 px-4 py-2.5 rounded-lg bg-[var(--bg-subtle)] border border-[var(--line)] flex-wrap">
        {/* 进度 */}
        <Code2 className="h-3.5 w-3.5 text-[var(--accent)] shrink-0" />
        <span className="text-[12px] font-medium text-[var(--ink)] shrink-0">{progress}%</span>
        <div className="h-1.5 w-20 rounded-full bg-[var(--bg)] overflow-hidden shrink-0">
          <div className="h-full rounded-full bg-[var(--accent)]" style={{ width: `${progress}%` }} />
        </div>
        <span className="text-[11px] text-[var(--ink-muted)] shrink-0">{versionTasks.length}任务 · {totalEstimate}h</span>
        {blockedCount > 0 && <span className="text-[10px] text-red-500 bg-red-50 px-1.5 py-0.5 rounded shrink-0">{blockedCount}阻塞</span>}

        <span className="w-px h-4 bg-[var(--line)] mx-1 shrink-0" />

        {/* 筛选 */}
        <select value={filterAssignee} onChange={(e) => { setFilterAssignee(e.target.value); setPage(1); }} className="h-6 rounded border border-[var(--line)] bg-[var(--bg-card)] px-1.5 text-[11px] text-[var(--ink-soft)] focus:border-[var(--accent)] focus:outline-none">
          <option value="">负责人</option>
          {user?.name && <option value={user.name}>我的</option>}
          {assignees.filter((a) => a !== user?.name).map((a) => <option key={a} value={a}>{a}</option>)}
        </select>
        <select value={filterStatus} onChange={(e) => { setFilterStatus(e.target.value); setPage(1); }} className="h-6 rounded border border-[var(--line)] bg-[var(--bg-card)] px-1.5 text-[11px] text-[var(--ink-soft)] focus:border-[var(--accent)] focus:outline-none">
          <option value="">状态</option>
          {(Object.entries(DEV_TASK_STATUS_LABEL) as [DevTaskStatus, string][]).map(([k, v]) => <option key={k} value={k}>{v}</option>)}
        </select>
        <select value={filterBlocked} onChange={(e) => { setFilterBlocked(e.target.value); setPage(1); }} className="h-6 rounded border border-[var(--line)] bg-[var(--bg-card)] px-1.5 text-[11px] text-[var(--ink-soft)] focus:border-[var(--accent)] focus:outline-none">
          <option value="">阻塞</option>
          <option value="yes">阻塞中</option>
          <option value="no">正常</option>
        </select>
        <select value={filterCategory} onChange={(e) => { setFilterCategory(e.target.value); setPage(1); }} className="h-6 rounded border border-[var(--line)] bg-[var(--bg-card)] px-1.5 text-[11px] text-[var(--ink-soft)] focus:border-[var(--accent)] focus:outline-none">
          <option value="">类型</option>
          {categories.map((c) => <option key={c.id} value={c.id}>{c.name}</option>)}
        </select>
        {hasFilter && <button onClick={() => { setFilterAssignee(''); setFilterStatus(''); setFilterBlocked(''); setFilterCategory(''); setPage(1); }} className="text-[10px] text-[var(--accent)] hover:underline shrink-0">清除</button>}

        {/* 右侧操作 */}
        <div className="ml-auto flex items-center gap-2 shrink-0">
          {selectedIds.size > 0 && (
            <button onClick={handleBatchDelete} className="flex items-center gap-1 h-6 px-2 rounded text-[11px] font-medium bg-red-500 text-white hover:bg-red-600">
              <Trash2 className="h-3 w-3" />删除{selectedIds.size}项
            </button>
          )}
          <button onClick={() => setShowCreate(true)} className="flex items-center gap-1 h-6 px-2.5 rounded text-[11px] font-medium bg-[var(--accent)] text-white hover:bg-[var(--accent-hover)]">
            <Plus className="h-3 w-3" />新建
          </button>
        </div>
      </div>

      {/* 列表 */}
      {filteredTasks.length === 0 ? (
        <div className="rounded-xl border border-dashed border-[var(--line)] bg-[var(--bg-card)] p-12 text-center">
          <p className="text-[13px] text-[var(--ink-muted)]">{hasFilter ? '没有匹配的任务' : '暂无开发任务'}</p>
          {!hasFilter && <button onClick={() => setShowCreate(true)} className="mt-3 text-[12px] text-[var(--accent)] hover:underline">创建第一个任务</button>}
        </div>
      ) : (
        Array.from(groupedByReq.entries()).map(([reqId, reqTasks]) => {
          const req = requirements.find((r) => r.id === reqId);
          const reqProgress = calcGroupProgress(reqTasks);
          return (
            <div key={reqId} className="rounded-lg border border-[var(--line)] bg-[var(--bg-card)] overflow-hidden">
              <div className="flex items-center gap-2 px-4 py-2 bg-[var(--bg-subtle)] border-b border-[var(--line)]">
                <input type="checkbox" checked={reqTasks.every((t) => selectedIds.has(t.id))} onChange={() => { const ids = reqTasks.map((t) => t.id); const allSelected = ids.every((id) => selectedIds.has(id)); const next = new Set(selectedIds); if (allSelected) ids.forEach((id) => next.delete(id)); else ids.forEach((id) => next.add(id)); setSelectedIds(next); }} className="h-3.5 w-3.5 rounded border-[var(--line)]" />
                <span className="text-[11px] font-mono text-[var(--ink-muted)]">{req?.code}</span>
                <span className="text-[12px] font-medium text-[var(--ink)] flex-1 truncate">{req?.title}</span>
                <span className="text-[11px] text-[var(--ink-muted)]">{reqProgress}%</span>
              </div>
              {reqTasks.map((t) => (
                <div key={t.id} className="flex items-center">
                  <div className="pl-4 flex items-center">
                    <input type="checkbox" checked={selectedIds.has(t.id)} onChange={() => toggleSelect(t.id)} className="h-3.5 w-3.5 rounded border-[var(--line)]" onClick={(e) => e.stopPropagation()} />
                  </div>
                  <div className="flex-1 min-w-0">
                    <DevTaskRow task={t} category={categories.find((c) => c.id === t.categoryId)} onClick={() => setSelectedTaskId(t.id)} />
                  </div>
                </div>
              ))}
            </div>
          );
        })
      )}

      {total > 20 && <Pagination total={total} page={page} pageSize={pageSize} onChange={setPage} onPageSizeChange={setPageSize} />}

      {showCreate && <DevTaskCreateModal versionId={versionId} requirementIds={requirementIds} versionDeadline={versionDeadline} onClose={() => setShowCreate(false)} />}
      {selectedTaskId && <DevTaskDetailDrawer taskId={selectedTaskId} allTaskIds={versionTasks.map((t) => t.id)} onClose={() => setSelectedTaskId(null)} />}
    </div>
  );
}