'use client';

import { useState, useMemo, useEffect } from 'react';
import { Plus, ClipboardCheck, CheckCircle2, Trash2 } from 'lucide-react';
import { useTestCaseStore } from '@/stores/useTestCaseStore';
import { useBugStore } from '@/stores/useBugStore';
import { useDevTaskStore } from '@/stores/useDevTaskStore';
import { useRequirementStore } from '@/stores/useRequirementStore';
import { useAuthStore } from '@/stores/useAuthStore';
import { useTaskCategoryStore } from '@/stores/useTaskCategoryStore';
import { TestCaseRow } from './TestCaseRow';
import { TestCaseCreateModal } from './TestCaseCreateModal';
import { TestCaseDetailDrawer } from './TestCaseDetailDrawer';
import { BugCreateModal } from '@/components/bug/BugCreateModal';
import { aggregateTestCaseHours, calcTestProgress, TEST_CASE_STATUS_LABEL, testCaseIntervals } from '@/lib/test-case';
import { formatWorkHours, calcTwoMetrics } from '@/lib/work-hours';
import { Pagination, usePagination } from '@/components/Pagination';
import { SearchInput, matchTitleOrNo } from '@/components/SearchInput';
import { useDebouncedValue } from '@/hooks/useDebouncedValue';
import type { TestCaseStatus } from '@/lib/test-case';

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

export function TestCaseTab({ versionId, requirementIds }: Props) {
  const { testCases, fetchTestCases, deleteTestCase } = useTestCaseStore();
  const { bugs, fetchBugs } = useBugStore();
  const { tasks: devTasks } = useDevTaskStore();
  const { requirements } = useRequirementStore();
  const user = useAuthStore((s) => s.user);
  const { categories, fetchCategories } = useTaskCategoryStore();

  useEffect(() => { fetchTestCases(); }, [fetchTestCases]);
  useEffect(() => { fetchBugs(); }, [fetchBugs]);
  useEffect(() => { fetchCategories(); }, [fetchCategories]);

  const reqIdSet = useMemo(() => new Set(requirementIds), [requirementIds]);
  const versionCases = useMemo(
    () => testCases.filter((c) => c.versionId === versionId),
    [testCases, versionId],
  );

  const versionDevTasks = useMemo(
    () => devTasks.filter((t) => reqIdSet.has(t.requirementId)),
    [devTasks, reqIdSet],
  );
  const allSubmitted = versionDevTasks.length > 0 && versionDevTasks.every((t) => t.status === 'submitted');

  const stats = calcTestProgress(versionCases);
  const { estimate: tcEstimateHours, actual: tcActualHours } = aggregateTestCaseHours(versionCases);
  const { calendarHours: tcCalendarHours, manhours: tcManhours } = useMemo(() => calcTwoMetrics(testCaseIntervals(versionCases)), [versionCases]);

  const [filterAssignee, setFilterAssignee] = useState('');
  const [filterStatus, setFilterStatus] = useState('');
  const [keyword, setKeyword] = useState('');
  const debouncedKeyword = useDebouncedValue(keyword, 300);

  const filteredCases = useMemo(() => {
    let result = versionCases;
    if (filterAssignee) result = result.filter((c) => c.assigneeId === filterAssignee);
    if (filterStatus) result = result.filter((c) => c.status === filterStatus);
    if (debouncedKeyword) result = result.filter((c) => matchTitleOrNo({ title: c.title, no: c.caseNo }, debouncedKeyword));
    return result;
  }, [versionCases, filterAssignee, filterStatus, debouncedKeyword]);

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

  const [showCreate, setShowCreate] = useState(false);
  const [selectedCaseId, setSelectedCaseId] = useState<string | null>(null);
  const [bugForCaseId, setBugForCaseId] = useState<string | null>(null);

  const [selectedIds, setSelectedIds] = useState<Set<string>>(new Set());

  const toggleSelect = (id: string) => {
    const next = new Set(selectedIds);
    if (next.has(id)) next.delete(id); else next.add(id);
    setSelectedIds(next);
  };
  const handleBatchDelete = () => {
    if (selectedIds.size === 0) return;
    const hasBug = Array.from(selectedIds).some((id) => bugs.some((b) => b.testCaseId === id));
    if (hasBug) { alert('选中的用例中有关联 Bug 的用例，无法删除。请先取消关联 Bug 的用例选择。'); return; }
    if (!confirm(`确定删除选中的 ${selectedIds.size} 个测试用例？`)) return;
    selectedIds.forEach((id) => deleteTestCase(id));
    setSelectedIds(new Set());
  };

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

  const requirementMap = useMemo(() => new Map(requirements.map((r) => [r.id, r])), [requirements]);
  const categoryMap = useMemo(() => new Map(categories.map((c) => [c.id, c])), [categories]);
  const bugCountByCase = useMemo(() => {
    const map = new Map<string, number>();
    for (const b of bugs) map.set(b.testCaseId, (map.get(b.testCaseId) ?? 0) + 1);
    return map;
  }, [bugs]);

  const assignees = useMemo(() => Array.from(new Set(versionCases.map((c) => c.assigneeId).filter(Boolean) as string[])), [versionCases]);
  const hasFilter = !!(filterAssignee || filterStatus || debouncedKeyword);

  return (
    <div className="space-y-3">
      {allSubmitted && (
        <div className="flex items-center gap-2 px-4 py-2 rounded-lg bg-emerald-50 border border-emerald-200">
          <CheckCircle2 className="h-3.5 w-3.5 text-emerald-600" />
          <span className="text-[12px] font-medium text-emerald-700">开发已全部提测，可以开始测试</span>
          <span className="text-[11px] text-emerald-600 ml-auto">{versionDevTasks.length} 个任务已交付</span>
        </div>
      )}
      {versionDevTasks.length > 0 && !allSubmitted && (
        <div className="flex items-center gap-2 px-4 py-2 rounded-lg bg-orange-50 border border-orange-200">
          <span className="text-[12px] text-orange-700">开发进行中（{versionDevTasks.filter((t) => t.status === 'submitted').length}/{versionDevTasks.length} 已提测）</span>
        </div>
      )}

      <div className="flex items-center gap-2 px-4 py-2.5 rounded-lg bg-[var(--bg-subtle)] border border-[var(--line)] flex-wrap">
        <ClipboardCheck className="h-3.5 w-3.5 text-emerald-500 shrink-0" />
        <span className="text-[12px] font-medium text-[var(--ink)] shrink-0">{stats.completionRate}%</span>
        <div className="h-1.5 w-20 rounded-full bg-[var(--bg)] overflow-hidden shrink-0">
          <div className="h-full rounded-full bg-emerald-500" style={{ width: `${stats.completionRate}%` }} />
        </div>
        <span className="text-[11px] text-[var(--ink-muted)] shrink-0">{stats.total}例 · 通过{stats.passed} · 不通过{stats.failed} · 预 {formatWorkHours(tcEstimateHours)} / 实 {formatWorkHours(tcActualHours)}</span>
        <span className="text-[11px] text-[var(--ink-muted)] shrink-0">通过率{stats.passRate}%</span>
        {tcManhours > 0 && (
          <span className="text-[11px] text-[var(--ink-muted)] shrink-0">日历 {formatWorkHours(tcCalendarHours)} / 人力 {formatWorkHours(tcManhours)}</span>
        )}

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

        <SearchInput value={keyword} onChange={(v) => { setKeyword(v); setPage(1); }} placeholder="搜索标题/编号" />
        <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(TEST_CASE_STATUS_LABEL) as [TestCaseStatus, string][]).map(([k, v]) => <option key={k} value={k}>{v}</option>)}
        </select>
        {hasFilter && <button onClick={() => { setFilterAssignee(''); setFilterStatus(''); setKeyword(''); setPage(1); }} className="text-[10px] text-[var(--accent)] hover:underline shrink-0">清除</button>}

        <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>

      {filteredCases.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 ? '没有匹配的用例' : '暂无测试用例'}</p>
          {!hasFilter && <button onClick={() => setShowCreate(true)} className="mt-3 text-[12px] text-[var(--accent)] hover:underline">创建第一个用例</button>}
        </div>
      ) : (
        Array.from(groupedByReq.entries()).map(([reqId, cases]) => {
          const req = reqId === '__none__' ? null : requirementMap.get(reqId);
          const reqPassed = cases.filter((c) => c.status === 'passed').length;
          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={cases.every((c) => selectedIds.has(c.id))} onChange={() => { const ids = cases.map((c) => c.id); const allSel = ids.every((id) => selectedIds.has(id)); const next = new Set(selectedIds); if (allSel) 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 || '通用'}</span>
                <span className="text-[12px] font-medium text-[var(--ink)] flex-1 truncate">{req?.title || '未关联需求'}</span>
                <span className="text-[11px] text-[var(--ink-muted)]">{reqPassed}/{cases.length} 通过</span>
              </div>
              {cases.map((c) => (
                <div key={c.id} className="flex items-center">
                  <div className="pl-4 flex items-center">
                    <input type="checkbox" checked={selectedIds.has(c.id)} onChange={() => toggleSelect(c.id)} className="h-3.5 w-3.5 rounded border-[var(--line)]" onClick={(e) => e.stopPropagation()} />
                  </div>
                  <div className="flex-1 min-w-0">
                    <TestCaseRow testCase={c} category={categoryMap.get(c.categoryId)} bugCount={bugCountByCase.get(c.id) ?? 0} onClick={() => setSelectedCaseId(c.id)} />
                  </div>
                </div>
              ))}
            </div>
          );
        })
      )}

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

      {showCreate && <TestCaseCreateModal versionId={versionId} requirementIds={requirementIds} onClose={() => setShowCreate(false)} />}
      {selectedCaseId && <TestCaseDetailDrawer testCaseId={selectedCaseId} onClose={() => setSelectedCaseId(null)} onCreateBug={(id) => setBugForCaseId(id)} />}
      {bugForCaseId && <BugCreateModal testCaseId={bugForCaseId} onClose={() => setBugForCaseId(null)} />}
    </div>
  );
}