'use client';

import { useState, useMemo } from 'react';
import { X, AlertTriangle } from 'lucide-react';
import { useDevTaskStore } from '@/stores/useDevTaskStore';
import { useTaskCategoryStore } from '@/stores/useTaskCategoryStore';
import { useRequirementStore } from '@/stores/useRequirementStore';
import { useMemberStore } from '@/stores/useMemberStore';
import { useAuthStore } from '@/stores/useAuthStore';
import type { Priority } from '@/lib/derive';

interface Props {
  versionId: string;
  requirementIds: string[];
  versionDeadline?: string;
  onClose: () => void;
  onCreated?: () => void;
}

export function DevTaskCreateModal({ versionId, requirementIds, versionDeadline, onClose, onCreated }: Props) {
  const { createTask, tasks } = useDevTaskStore();
  const { categories } = useTaskCategoryStore();
  const { requirements } = useRequirementStore();
  const { members } = useMemberStore();
  const user = useAuthStore((s) => s.user);

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

  const [title, setTitle] = useState('');
  const [requirementId, setRequirementId] = useState(versionReqs[0]?.id || '');
  const [categoryId, setCategoryId] = useState(categories[0]?.id || '');
  const [assigneeId, setAssigneeId] = useState(user?.name || '');
  const [priority, setPriority] = useState<Priority>(versionReqs[0]?.priority || 'P2');
  const [priorityManuallySet, setPriorityManuallySet] = useState(false);
  const [estimateHours, setEstimateHours] = useState<number>(8);
  const [dueDate, setDueDate] = useState('');
  const [predecessorIds, setPredecessorIds] = useState<string[]>([]);
  const [description, setDescription] = useState('');
  const [overdueReason, setOverdueReason] = useState('');

  const selectedReq = versionReqs.find((r) => r.id === requirementId);
  const effectivePriority = priorityManuallySet ? priority : (selectedReq?.priority || priority);
  const isOverdue = !!(dueDate && versionDeadline && dueDate > versionDeadline);
  const canSubmit = title.trim() && requirementId && categoryId && assigneeId && estimateHours > 0 && (!isOverdue || overdueReason.trim());

  const handleSubmit = () => {
    if (!canSubmit) return;
    createTask({
      requirementId,
      title: title.trim(),
      description: description.trim() || undefined,
      categoryId,
      assigneeId,
      reviewerId: undefined,
      priority: effectivePriority,
      estimateHours,
      startDate: undefined,
      dueDate: dueDate || undefined,
      completedAt: undefined,
      status: 'todo',
      blockReason: undefined,
      blockedById: undefined,
      predecessorIds: predecessorIds.length > 0 ? predecessorIds : undefined,
      riskLevel: undefined,
      overdueReason: isOverdue ? overdueReason.trim() : undefined,
      createdBy: user?.name || '系统',
    });
    onCreated?.();
    onClose();
  };

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/40" onClick={onClose}>
      <div className="w-full max-w-lg rounded-2xl bg-[var(--bg-card)] border border-[var(--line)] p-6 shadow-[var(--shadow-md)]" onClick={(e) => e.stopPropagation()}>
        <div className="flex items-center justify-between mb-4">
          <h3 className="text-[14px] font-semibold text-[var(--ink)]">新建开发任务</h3>
          <button onClick={onClose} className="rounded-md p-1 hover:bg-[var(--bg-subtle)]"><X className="h-4 w-4 text-[var(--ink-muted)]" /></button>
        </div>
        <div className="space-y-3 max-h-[60vh] overflow-y-auto">
          <div>
            <label className="block text-[12px] text-[var(--ink-soft)] mb-1">任务标题 *</label>
            <input value={title} onChange={(e) => setTitle(e.target.value)} className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none" placeholder="例如：排班界面开发" />
          </div>
          <div>
            <label className="block text-[12px] text-[var(--ink-soft)] mb-1">所属需求 *</label>
            <select value={requirementId} onChange={(e) => { setRequirementId(e.target.value); const r = versionReqs.find((x) => x.id === e.target.value); if (r && !priorityManuallySet) setPriority(r.priority); }} className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none">
              {versionReqs.map((r) => <option key={r.id} value={r.id}>{r.code} {r.title}</option>)}
            </select>
          </div>
          <div className="grid grid-cols-2 gap-3">
            <div>
              <label className="block text-[12px] text-[var(--ink-soft)] mb-1">任务类型 *</label>
              <select value={categoryId} onChange={(e) => setCategoryId(e.target.value)} className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none">
                {categories.map((c) => <option key={c.id} value={c.id}>{c.name}</option>)}
              </select>
            </div>
            <div>
              <label className="block text-[12px] text-[var(--ink-soft)] mb-1">负责人 *</label>
              <select value={assigneeId} onChange={(e) => setAssigneeId(e.target.value)} className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none">
                <option value="">选择负责人</option>
                {members.map((m) => <option key={m.id} value={m.name}>{m.name}</option>)}
              </select>
            </div>
          </div>
          <div className="grid grid-cols-3 gap-3">
            <div>
              <label className="block text-[12px] text-[var(--ink-soft)] mb-1">优先级</label>
              <select value={effectivePriority} onChange={(e) => { setPriority(e.target.value as Priority); setPriorityManuallySet(true); }} className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none">
                {(['P0','P1','P2','P3'] as Priority[]).map((p) => <option key={p} value={p}>{p}</option>)}
              </select>
            </div>
            <div>
              <label className="block text-[12px] text-[var(--ink-soft)] mb-1">预计工时(h) *</label>
              <input type="number" min={0.5} step={0.5} value={estimateHours} onChange={(e) => setEstimateHours(parseFloat(e.target.value) || 0)} className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none" />
            </div>
            <div>
              <label className="block text-[12px] text-[var(--ink-soft)] mb-1">截止日期</label>
              <input type="date" value={dueDate} onChange={(e) => setDueDate(e.target.value)} className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none" />
              {versionDeadline && (
                <p className="text-[10px] text-[var(--ink-muted)] mt-0.5">版本截止：{versionDeadline}</p>
              )}
            </div>
          </div>
          {isOverdue && (
            <div className="rounded-lg border border-orange-200 bg-orange-50 p-3 space-y-2">
              <div className="flex items-center gap-1.5 text-[11px] text-orange-700">
                <AlertTriangle className="h-3.5 w-3.5" />
                任务截止日期超出版本截止日期（{versionDeadline}），请说明原因
              </div>
              <input value={overdueReason} onChange={(e) => setOverdueReason(e.target.value)} placeholder="超期原因（必填）" className="h-8 w-full rounded-md border border-orange-200 bg-white px-2 text-[12px] focus:border-orange-400 focus:outline-none" />
            </div>
          )}
          {versionTasks.length > 0 && (
            <div>
              <label className="block text-[12px] text-[var(--ink-soft)] mb-1">前置任务</label>
              <div className="space-y-1 max-h-28 overflow-y-auto border border-[var(--line)] rounded-lg p-2">
                {versionTasks.map((t) => (
                  <label key={t.id} className="flex items-center gap-2 text-[12px] text-[var(--ink)]">
                    <input type="checkbox" checked={predecessorIds.includes(t.id)} onChange={(e) => setPredecessorIds(e.target.checked ? [...predecessorIds, t.id] : predecessorIds.filter((x) => x !== t.id))} />
                    <span className="text-[var(--ink-muted)] font-mono">{t.taskNo}</span> {t.title}
                  </label>
                ))}
              </div>
            </div>
          )}
          <div>
            <label className="block text-[12px] text-[var(--ink-soft)] mb-1">描述</label>
            <textarea rows={3} value={description} onChange={(e) => setDescription(e.target.value)} className="w-full rounded-lg border border-[var(--line)] bg-[var(--bg)] px-3 py-2 text-[13px] focus:border-[var(--accent)] focus:outline-none resize-none" placeholder="任务描述（可选）" />
          </div>
        </div>
        <div className="flex justify-end gap-2 pt-4 border-t border-[var(--line)] mt-4">
          <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 onClick={handleSubmit} disabled={!canSubmit} className="h-8 px-4 rounded-lg text-[12px] font-medium bg-[var(--accent)] text-white hover:bg-[var(--accent-hover)] disabled:opacity-50">创建</button>
        </div>
      </div>
    </div>
  );
}