'use client';

import { useEffect, useMemo, useState } from 'react';
import { Search, Plus, X, Download } from 'lucide-react';
import { useOvertimeStore } from '@/stores/useOvertimeStore';
import { useProductStore } from '@/stores/useProductStore';
import { useRequirementStore } from '@/stores/useRequirementStore';
import { useAuthStore } from '@/stores/useAuthStore';
import { useMemberStore } from '@/stores/useMemberStore';
import { flattenProjects, flattenVersions } from '@/lib/derive';
import { calcDuration, filterOvertimeRecordsForViewer } from '@/lib/overtime';
import type { OvertimeRecord } from '@/lib/overtime';
import { Pagination, usePagination } from '@/components/Pagination';
import { DictDrawer } from '@/components/requirement/DictDrawer';
import { MonthPicker } from '@/components/MonthPicker';
import { FilterSelect } from '@/components/FilterSelect';
import { FieldError } from '@/components/FieldError';
import { RouteGuard } from '@/components/auth/Guard';
import { WorkDateTimePicker } from '@/components/WorkDateTimePicker';

export default function OvertimePage() {
  return (
    <RouteGuard permission="overtime:view">
      <OvertimePageContent />
    </RouteGuard>
  );
}

function OvertimePageContent() {
  const { records, fetchRecords, createRecord, deleteRecord, reasons, addReason, updateReason, deleteReason } = useOvertimeStore();
  const { overview, fetchOverview } = useProductStore();
  const { requirements, fetchRequirements } = useRequirementStore();
  const { departments, members, roles, fetchMembers } = useMemberStore();
  const user = useAuthStore((s) => s.user);
  const viewerRole = useMemo(() => roles.find((role) => role.id === user?.roleId), [roles, user?.roleId]);
  const allProjects = useMemo(() => flattenProjects(overview), [overview]);
  const allVersions = useMemo(() => flattenVersions(overview), [overview]);

  const [search, setSearch] = useState('');
  const [projectFilter, setProjectFilter] = useState('all');
  const [reasonFilter, setReasonFilter] = useState('all');
  const [monthFilter, setMonthFilter] = useState('');
  const [showModal, setShowModal] = useState(false);
  const [showReasonDrawer, setShowReasonDrawer] = useState(false);

  useEffect(() => { fetchOverview(); }, [fetchOverview]);
  useEffect(() => { fetchRequirements(); }, [fetchRequirements]);
  useEffect(() => { fetchRecords(); }, [fetchRecords]);
  useEffect(() => { fetchMembers(); }, [fetchMembers]);

  const projectName = (id: string) => allProjects.find((p) => p.id === id)?.name ?? '-';
  const versionName = (id?: string) => id ? (allVersions.find((v) => v.id === id)?.name ?? '-') : '-';
  const reasonName = (id: string) => reasons.find((r) => r.id === id)?.name ?? '-';
  const visibleRecords = useMemo(() => filterOvertimeRecordsForViewer(records, {
    viewer: user,
    viewerRole,
    members,
    departments,
  }), [records, user, viewerRole, members, departments]);

  const filtered = useMemo(() => {
    let list = [...visibleRecords];
    if (search) list = list.filter((r) => r.person.includes(search));
    if (projectFilter !== 'all') list = list.filter((r) => r.projectId === projectFilter);
    if (reasonFilter !== 'all') list = list.filter((r) => r.reasonId === reasonFilter);
    if (monthFilter) list = list.filter((r) => r.startTime.slice(0, 7) === monthFilter);
    list.sort((a, b) => new Date(b.startTime).getTime() - new Date(a.startTime).getTime());
    return list;
  }, [visibleRecords, search, projectFilter, reasonFilter, monthFilter]);

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

  const handleCreate = () => { setShowModal(true); };

  const handleExport = () => {
    const header = ['项目', '版本', '加班人', '开始时间', '结束时间', '时长(h)', '加班原因', '备注'];
    const rows = filtered.map((r) => [
      projectName(r.projectId),
      versionName(r.versionId),
      r.person,
      r.startTime.replace('T', ' '),
      r.endTime.replace('T', ' '),
      String(r.duration),
      reasonName(r.reasonId),
      r.remark || '',
    ]);
    const bom = '';
    const csv = [header.join(','), ...rows.map((row) => row.map((c) => `"${c.replace(/"/g, '""')}"`).join(','))].join('\r\n');
    const blob = new Blob([bom + csv], { type: 'text/csv;charset=utf-8' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = `加班记录${monthFilter || '_全部'}.csv`;
    a.click();
    URL.revokeObjectURL(url);
  };

  return (
    <div className="flex h-full flex-col">
      <header className="flex h-14 shrink-0 items-center justify-between border-b border-[var(--line)] bg-[var(--bg-card)] px-5">
        <div className="flex items-center gap-2.5">
          <h1 className="text-[15px] font-semibold tracking-tight text-[var(--ink)]">加班记录</h1>
          <span className="rounded-md bg-[var(--bg-subtle)] px-1.5 py-0.5 text-[11px] font-medium tabular-nums text-[var(--ink-soft)]">{visibleRecords.length}</span>
        </div>
        <div className="flex items-center gap-2">
          <button onClick={handleExport} className="flex h-8 items-center gap-1.5 rounded-lg border border-[var(--line)] bg-[var(--bg-card)] px-3 text-[13px] font-medium text-[var(--ink-soft)] hover:border-[var(--accent)] hover:text-[var(--accent)] transition-colors">
            <Download className="h-3.5 w-3.5" strokeWidth={2} />
            导出
          </button>
          <button onClick={() => setShowReasonDrawer(true)} className="flex h-8 items-center gap-1.5 rounded-lg border border-[var(--line)] bg-[var(--bg-card)] px-3 text-[13px] font-medium text-[var(--ink-soft)] hover:border-[var(--accent)] hover:text-[var(--accent)] transition-colors">
            原因管理
          </button>
          <button onClick={handleCreate} className="flex h-8 items-center gap-1.5 rounded-lg bg-[var(--accent)] px-3 text-[13px] font-medium text-white shadow-[var(--shadow-sm)] hover:bg-[var(--accent-hover)] transition-colors">
            <Plus className="h-3.5 w-3.5" strokeWidth={2} />
            新建记录
          </button>
        </div>
      </header>

      {/* Filters */}
      <div className="flex shrink-0 flex-wrap items-center gap-3 border-b border-[var(--line)] bg-[var(--bg-card)] px-5 py-3">
        <div className="relative">
          <Search className="pointer-events-none absolute left-2.5 top-1/2 h-3.5 w-3.5 -translate-y-1/2 text-[var(--ink-muted)]" strokeWidth={2} />
          <input value={search} onChange={(e) => setSearch(e.target.value)} placeholder="搜索人员" className="h-8 w-48 rounded-lg border border-[var(--line)] bg-[var(--bg)] pl-8 pr-3 text-[13px] text-[var(--ink)] placeholder:text-[var(--ink-muted)] focus:border-[var(--accent)] focus:outline-none" />
        </div>
        <FilterSelect
          value={projectFilter}
          onChange={setProjectFilter}
          options={allProjects.map((p) => ({ value: p.id, label: p.name }))}
          placeholder="全部项目"
          allLabel="全部项目"
        />
        <FilterSelect
          value={reasonFilter}
          onChange={setReasonFilter}
          options={reasons.map((r) => ({ value: r.id, label: r.name }))}
          placeholder="全部原因"
          allLabel="全部原因"
        />
        <MonthPicker value={monthFilter} onChange={setMonthFilter} placeholder="全部月份" />
      </div>

      {/* Table */}
      <div className="flex-1 overflow-y-auto bg-[var(--bg)] px-5 py-4">
        {filtered.length === 0 ? (
          <div className="rounded-2xl border border-dashed border-[var(--line)] bg-[var(--bg-card)] py-20 text-center">
            <p className="text-[13px] font-medium text-[var(--ink-soft)]">暂无加班记录</p>
          </div>
        ) : (
          <>
            <div className="rounded-2xl border border-[var(--line)] bg-[var(--bg-card)] shadow-[var(--shadow-sm)]">
              <table className="w-full text-left text-[13px]">
                <thead className="sticky top-0 z-10 bg-[var(--bg-subtle)]">
                  <tr className="border-b border-[var(--line)] bg-[var(--bg-subtle)]">
                    <th className="px-4 py-2.5 text-[11px] font-medium uppercase tracking-wide text-[var(--ink-muted)]">项目</th>
                    <th className="px-4 py-2.5 text-[11px] font-medium uppercase tracking-wide text-[var(--ink-muted)]">版本</th>
                    <th className="px-4 py-2.5 text-[11px] font-medium uppercase tracking-wide text-[var(--ink-muted)]">加班人</th>
                    <th className="px-4 py-2.5 text-[11px] font-medium uppercase tracking-wide text-[var(--ink-muted)]">开始时间</th>
                    <th className="px-4 py-2.5 text-[11px] font-medium uppercase tracking-wide text-[var(--ink-muted)]">结束时间</th>
                    <th className="px-4 py-2.5 text-[11px] font-medium uppercase tracking-wide text-[var(--ink-muted)]">时长</th>
                    <th className="px-4 py-2.5 text-[11px] font-medium uppercase tracking-wide text-[var(--ink-muted)]">加班原因</th>
                    <th className="px-4 py-2.5 text-[11px] font-medium uppercase tracking-wide text-[var(--ink-muted)]">备注</th>
                    <th className="px-4 py-2.5 text-[11px] font-medium uppercase tracking-wide text-[var(--ink-muted)]">创建日期</th>
                    <th className="px-4 py-2.5 text-right text-[11px] font-medium uppercase tracking-wide text-[var(--ink-muted)]">操作</th>
                  </tr>
                </thead>
                <tbody>
                  {paged.map((r) => (
                    <tr key={r.id} className="border-b border-[var(--line-soft)] last:border-0 transition-colors hover:bg-[var(--bg-subtle)]">
                      <td className="px-4 py-3 text-[var(--ink)]">{projectName(r.projectId)}</td>
                      <td className="px-4 py-3 text-[var(--ink-soft)]">{versionName(r.versionId)}</td>
                      <td className="px-4 py-3 font-medium text-[var(--ink)]">{r.person}</td>
                      <td className="px-4 py-3 tabular-nums text-[var(--ink-soft)]">{r.startTime.replace('T', ' ')}</td>
                      <td className="px-4 py-3 tabular-nums text-[var(--ink-soft)]">{r.endTime.replace('T', ' ')}</td>
                      <td className="px-4 py-3">
                        <span className={`inline-flex items-center gap-1 font-medium tabular-nums ${r.duration >= 4 ? 'text-red-600' : r.duration >= 2 ? 'text-orange-600' : 'text-[var(--ink)]'}`}>
                          {r.duration}h
                        </span>
                      </td>
                      <td className="px-4 py-3">
                        <span className="inline-flex items-center rounded-md bg-zinc-100 px-2 py-0.5 text-[11px] font-medium text-zinc-700">
                          {reasonName(r.reasonId)}
                        </span>
                      </td>
                      <td className="px-4 py-3 text-[12px] text-[var(--ink-muted)] max-w-[120px] truncate">{r.remark || '-'}</td>
                      <td className="px-4 py-3 tabular-nums text-[var(--ink-muted)]">{r.createdAt}</td>
                      <td className="px-4 py-3 text-right">
                        <div className="flex items-center justify-end gap-1">
                          <button onClick={() => deleteRecord(r.id)} className="h-6 px-2 rounded text-[11px] font-medium text-red-500 hover:bg-red-50">删除</button>
                        </div>
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
            <Pagination total={total} page={page} pageSize={pageSize} onChange={setPage} onPageSizeChange={setPageSize} />
          </>
        )}
      </div>

      {/* Modal */}
      {showModal && (
        <OvertimeModal
          defaultPerson={user?.name ?? ''}
          products={overview.map((p) => ({ id: p.id, name: p.name }))}
          projects={allProjects.map((p) => ({ id: p.id, name: p.name, productId: p.productId }))}
          versions={allVersions}
          reasons={reasons}
          requirements={requirements.map((r) => ({ id: r.id, title: r.title, versionId: r.versionId }))}
          onClose={() => setShowModal(false)}
          onSubmit={(data) => {
            createRecord(data as any);
            setShowModal(false);
          }}
        />
      )}

      {/* Reason Drawer */}
      {showReasonDrawer && (
        <DictDrawer open={true} title="加班原因管理" items={reasons} onClose={() => setShowReasonDrawer(false)} onAdd={addReason} onUpdate={updateReason} onDelete={deleteReason} />
      )}
    </div>
  );
}

function OvertimeModal({ defaultPerson, products, projects, versions, reasons, requirements, onClose, onSubmit }: {
  defaultPerson: string;
  products: { id: string; name: string }[];
  projects: { id: string; name: string; productId: string }[];
  versions: { id: string; name: string; projectId?: string }[];
  reasons: { id: string; name: string }[];
  requirements: { id: string; title: string; versionId?: string }[];
  onClose: () => void;
  onSubmit: (data: any) => void;
}) {
  const [productId, setProductId] = useState('');
  const [projectId, setProjectId] = useState('');
  const [versionId, setVersionId] = useState('');
  const [startTime, setStartTime] = useState('');
  const [endTime, setEndTime] = useState('');
  const [reasonId, setReasonId] = useState('');
  const [remark, setRemark] = useState('');
  const [requirementId, setRequirementId] = useState('');
  const [endTimeError, setEndTimeError] = useState('');

  const duration = startTime && endTime ? calcDuration(startTime, endTime) : 0;
  const filteredProjects = productId ? projects.filter((p) => p.productId === productId) : projects;
  const filteredVersions = projectId ? versions.filter((v) => (v as any).projectId === projectId) : [];
  const filteredRequirements = versionId ? requirements.filter((r) => r.versionId === versionId) : [];

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    if (!projectId || !defaultPerson.trim() || !startTime || !endTime || !reasonId) return;
    if (new Date(endTime).getTime() <= new Date(startTime).getTime()) {
      setEndTimeError('结束时间必须晚于开始时间');
      return;
    }
    setEndTimeError('');
    onSubmit({ projectId, versionId: versionId || undefined, requirementId: requirementId || undefined, person: defaultPerson.trim(), startTime, endTime, reasonId, remark: remark.trim() || undefined });
  };

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/40" onClick={onClose}>
      <div className="w-full max-w-md rounded-2xl bg-[var(--bg-card)] border border-[var(--line)] p-5 shadow-[var(--shadow-md)]" onClick={(e) => e.stopPropagation()}>
        <div className="flex items-center justify-between mb-4">
          <h3 className="text-[13px] font-semibold text-[var(--ink)]">新建加班记录</h3>
          <button onClick={onClose} className="p-1 rounded hover:bg-[var(--bg-subtle)] text-[var(--ink-muted)]"><X className="h-4 w-4" /></button>
        </div>
        <form onSubmit={handleSubmit} className="space-y-3">
          <div className="grid grid-cols-3 gap-3">
            <div>
              <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">产品 *</label>
              <select value={productId} onChange={(e) => { setProductId(e.target.value); setProjectId(''); setVersionId(''); }} required className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg-card)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none">
                <option value="">选择产品</option>
                {products.map((p) => <option key={p.id} value={p.id}>{p.name}</option>)}
              </select>
            </div>
            <div>
              <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">项目 *</label>
              <select value={projectId} onChange={(e) => { setProjectId(e.target.value); setVersionId(''); }} required className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg-card)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none">
                <option value="">选择项目</option>
                {filteredProjects.map((p) => <option key={p.id} value={p.id}>{p.name}</option>)}
              </select>
            </div>
            <div>
              <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">版本 *</label>
              <select value={versionId} onChange={(e) => setVersionId(e.target.value)} required className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg-card)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none">
                <option value="">选择版本</option>
                {filteredVersions.map((v) => <option key={v.id} value={v.id}>{v.name}</option>)}
              </select>
            </div>
          </div>
          <div>
            <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">加班人</label>
            <input value={defaultPerson} disabled className="h-9 w-full rounded-lg border border-[var(--line)] bg-zinc-50 px-3 text-[13px] text-[var(--ink-soft)] cursor-not-allowed" />
          </div>
          <div className="grid grid-cols-2 gap-3">
            <div>
              <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">开始时间 *</label>
              <WorkDateTimePicker
                value={startTime}
                onChange={(next) => { setStartTime(next); setEndTimeError(''); }}
                placeholder="选择加班开始时间"
                defaultHour={19}
              />
            </div>
            <div>
              <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">结束时间 *</label>
              <WorkDateTimePicker
                value={endTime}
                onChange={(next) => { setEndTime(next); setEndTimeError(''); }}
                placeholder="选择加班结束时间"
                defaultHour={21}
                popoverAlign="right"
              />
              <FieldError message={endTimeError} />
            </div>
          </div>
          {duration > 0 && (
            <div className="text-[12px] text-[var(--ink-muted)]">
              时长：<span className={`font-medium ${duration >= 4 ? 'text-red-600' : duration >= 2 ? 'text-orange-600' : 'text-[var(--ink)]'}`}>{duration} 小时</span>
            </div>
          )}
          <div>
            <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">加班原因 *</label>
            <select value={reasonId} onChange={(e) => setReasonId(e.target.value)} required className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg-card)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none">
              <option value="">选择原因</option>
              {reasons.map((r) => <option key={r.id} value={r.id}>{r.name}</option>)}
            </select>
          </div>
          {filteredRequirements.length > 0 && (
            <div>
              <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">关联需求</label>
              <select value={requirementId} onChange={(e) => setRequirementId(e.target.value)} className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg-card)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none">
                <option value="">不关联</option>
                {filteredRequirements.map((r) => <option key={r.id} value={r.id}>{r.title}</option>)}
              </select>
            </div>
          )}
          <div>
            <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">备注</label>
            <textarea value={remark} onChange={(e) => setRemark(e.target.value)} rows={2} placeholder="可选" className="w-full rounded-lg border border-[var(--line)] bg-[var(--bg-card)] px-3 py-2 text-[13px] focus:border-[var(--accent)] focus:outline-none resize-none" />
          </div>
          <div className="flex justify-end gap-2 pt-2">
            <button type="button" onClick={onClose} className="h-8 px-3 rounded-lg text-[12px] font-medium border border-[var(--line)] text-[var(--ink-soft)] hover:bg-[var(--bg-subtle)]">取消</button>
            <button type="submit" className="h-8 px-4 rounded-lg text-[12px] font-medium bg-[var(--accent)] text-white hover:bg-[var(--accent-hover)]">创建</button>
          </div>
        </form>
      </div>
    </div>
  );
}