'use client';

import { useState } from 'react';
import { Plus, Pencil, Trash2, X, Check, ExternalLink, FileUp, Link2 } from 'lucide-react';
import type { VersionPlan } from '@/lib/version-plan';
import { calcPlanDuration, formatDuration, calcTotalDuration } from '@/lib/version-plan';

interface Props {
  plans: VersionPlan[];
  versionId: string;
  versionDeadline?: string;
  currentUserName: string;
  planType: 'research' | 'product' | 'ui';
  linkedRequirements?: { id: string; title: string; code: string; productOwner?: string }[];
  onCreate: (data: Omit<VersionPlan, 'id' | 'createdAt'>) => void;
  onUpdate: (id: string, data: Partial<VersionPlan>) => void;
  onComplete: (id: string, result: { resultType: 'link' | 'file'; resultUrl?: string; resultFileName?: string; resultFileData?: string }) => void;
  onDelete: (id: string) => void;
}

const TYPE_LABEL = { research: '调研', product: '产品方案', ui: 'UI设计' };
const STATUS_STYLE = {
  pending: 'bg-zinc-100 text-zinc-600',
  in_progress: 'bg-blue-50 text-blue-600 border-blue-200',
  completed: 'bg-green-50 text-green-700 border-green-200',
};
const STATUS_LABEL = { pending: '未开始', in_progress: '进行中', completed: '已完成' };

export function PlanTab({ plans, versionId, versionDeadline, currentUserName, planType, linkedRequirements, onCreate, onUpdate, onComplete, onDelete }: Props) {
  const [showCreateModal, setShowCreateModal] = useState(false);
  const [editingPlan, setEditingPlan] = useState<VersionPlan | null>(null);
  const [completingPlan, setCompletingPlan] = useState<VersionPlan | null>(null);

  const typePlans = plans.filter((p) => p.versionId === versionId && p.type === planType);
  const totalDuration = calcTotalDuration(typePlans);

  return (
    <div className="space-y-4">
      <div className="flex items-center justify-between">
        <div className="flex items-center gap-3">
          <span className="text-[12px] text-[var(--ink-muted)]">{typePlans.length} 个{TYPE_LABEL[planType]}计划</span>
          <span className="text-[12px] text-[var(--ink-soft)]">总耗时：<span className="font-medium text-[var(--ink)]">{totalDuration}</span></span>
          {versionDeadline && <span className="text-[12px] text-[var(--ink-muted)]">版本截止：<span className="font-medium text-red-500">{versionDeadline}</span></span>}
        </div>
        <button onClick={() => setShowCreateModal(true)} 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} />
          新建计划
        </button>
      </div>

      {typePlans.length === 0 ? (
        <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-12 text-center text-[13px] text-[var(--ink-muted)]">
          暂无{TYPE_LABEL[planType]}计划
        </div>
      ) : (
        <div className="space-y-3">
          {typePlans.map((plan) => {
            const dur = plan.completedAt
              ? calcPlanDuration(plan.startTime, plan.completedAt)
              : calcPlanDuration(plan.startTime, plan.endTime);
            const durText = formatDuration(dur.days, dur.hours);
            return (
              <div key={plan.id} className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4">
                <div className="flex items-start justify-between">
                  <div className="flex-1">
                    <div className="flex items-center gap-2 mb-1.5">
                      <span className="text-[13px] font-medium text-[var(--ink)]">{plan.title}</span>
                      <span className={`inline-flex items-center rounded-md px-2 py-0.5 text-[10px] font-medium border ${STATUS_STYLE[plan.status]}`}>
                        {STATUS_LABEL[plan.status]}
                      </span>
                    </div>
                    <div className="flex items-center gap-4 text-[12px] text-[var(--ink-soft)]">
                      <span>负责人：{plan.owner}</span>
                      <span>计划：{plan.startTime.slice(0, 10)} → {plan.endTime.slice(0, 10)}</span>
                      {plan.completedAt && <span className="text-green-600">完成：{plan.completedAt.slice(0, 10)}</span>}
                      <span className="font-medium text-[var(--ink)]">耗时 {durText}</span>
                    </div>
                    {plan.overdueReason && (
                      <div className="mt-1.5 text-[11px] text-red-600 bg-red-50 rounded px-2 py-1 inline-block">超期原因：{plan.overdueReason}</div>
                    )}
                    {plan.linkedRequirementIds && plan.linkedRequirementIds.length > 0 && linkedRequirements && (
                      <div className="flex flex-wrap gap-1.5 mt-2">
                        {plan.linkedRequirementIds.map((rid) => {
                          const req = linkedRequirements.find((r) => r.id === rid);
                          return req ? (
                            <span key={rid} className="inline-flex items-center gap-1 rounded bg-[var(--bg-subtle)] px-2 py-0.5 text-[11px] text-[var(--ink-soft)]">
                              {req.code} {req.title.slice(0, 12)}{req.title.length > 12 ? '...' : ''}
                              {req.productOwner && <span className="text-[var(--ink-muted)]">({req.productOwner})</span>}
                            </span>
                          ) : null;
                        })}
                      </div>
                    )}
                    {plan.status === 'completed' && plan.resultUrl && (
                      <div className="flex items-center gap-1.5 mt-2">
                        {plan.resultType === 'link' ? <Link2 className="h-3 w-3 text-[var(--accent)]" /> : <FileUp className="h-3 w-3 text-[var(--accent)]" />}
                        <a href={plan.resultUrl} target="_blank" rel="noopener noreferrer" className="text-[12px] text-[var(--accent)] hover:underline flex items-center gap-1">
                          {plan.resultFileName || '查看成果'}<ExternalLink className="h-3 w-3" />
                        </a>
                      </div>
                    )}
                  </div>
                  <div className="flex items-center gap-1 ml-3">
                    {plan.status !== 'completed' && (
                      <>
                        <button onClick={() => setCompletingPlan(plan)} className="h-7 w-7 flex items-center justify-center rounded-md text-green-600 hover:bg-green-50" title="标记完成">
                          <Check className="h-3.5 w-3.5" />
                        </button>
                        <button onClick={() => setEditingPlan(plan)} className="h-7 w-7 flex items-center justify-center rounded-md text-[var(--ink-muted)] hover:bg-[var(--bg-subtle)]" title="编辑">
                          <Pencil className="h-3.5 w-3.5" />
                        </button>
                        <button onClick={() => onDelete(plan.id)} className="h-7 w-7 flex items-center justify-center rounded-md text-red-500 hover:bg-red-50" title="删除">
                          <Trash2 className="h-3.5 w-3.5" />
                        </button>
                      </>
                    )}
                  </div>
                </div>
              </div>
            );
          })}
        </div>
      )}

      {(showCreateModal || editingPlan) && (
        <PlanFormModal
          initial={editingPlan}
          planType={planType}
          versionId={versionId}
          versionDeadline={versionDeadline}
          currentUserName={currentUserName}
          linkedRequirements={linkedRequirements}
          onClose={() => { setShowCreateModal(false); setEditingPlan(null); }}
          onSubmit={(data) => {
            if (editingPlan) onUpdate(editingPlan.id, data);
            else onCreate(data as any);
            setShowCreateModal(false);
            setEditingPlan(null);
          }}
        />
      )}

      {completingPlan && (
        <CompleteModal
          onClose={() => setCompletingPlan(null)}
          onSubmit={(result) => { onComplete(completingPlan.id, result); setCompletingPlan(null); }}
        />
      )}
    </div>
  );
}

function PlanFormModal({ initial, planType, versionId, versionDeadline, currentUserName, linkedRequirements, onClose, onSubmit }: {
  initial: VersionPlan | null;
  planType: 'research' | 'product' | 'ui';
  versionId: string;
  versionDeadline?: string;
  currentUserName: string;
  linkedRequirements?: { id: string; title: string; code: string }[];
  onClose: () => void;
  onSubmit: (data: any) => void;
}) {
  const now = new Date().toISOString().slice(0, 10);
  const [title, setTitle] = useState(initial?.title ?? '');
  const [owner] = useState(initial?.owner ?? currentUserName);
  const [startTime, setStartTime] = useState(initial?.startTime?.slice(0, 10) ?? now);
  const [endTime, setEndTime] = useState(initial?.endTime?.slice(0, 10) ?? '');
  const [remark, setRemark] = useState(initial?.remark ?? '');
  const [overdueReason, setOverdueReason] = useState(initial?.overdueReason ?? '');
  const [selectedReqs, setSelectedReqs] = useState<Set<string>>(new Set(initial?.linkedRequirementIds ?? []));
  const showReqSelect = planType === 'product' || planType === 'ui';
  const isOverdue = !!(versionDeadline && endTime && new Date(endTime) > new Date(versionDeadline));

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    if (!title.trim() || !endTime) return;
    if (isOverdue && !overdueReason.trim()) return;
    onSubmit({
      versionId,
      type: planType,
      title: title.trim(),
      owner: owner.trim() || currentUserName,
      startTime,
      endTime,
      status: initial?.status ?? 'pending',
      linkedRequirementIds: showReqSelect ? Array.from(selectedReqs) : undefined,
      remark: remark.trim() || undefined,
      overdueReason: isOverdue ? overdueReason.trim() : undefined,
      addedBy: currentUserName,
    });
  };

  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)]">{initial ? '编辑' : '新建'}{TYPE_LABEL[planType]}计划</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>
            <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">标题</label>
            <input value={title} onChange={(e) => setTitle(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" />
          </div>
          <div>
            <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">负责人</label>
            <input value={owner} readOnly className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg-subtle)] px-3 text-[13px] text-[var(--ink-muted)] 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">开始日期</label>
              <input type="date" value={startTime} onChange={(e) => setStartTime(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" />
            </div>
            <div>
              <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">结束日期</label>
              <input type="date" value={endTime} onChange={(e) => setEndTime(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" />
            </div>
          </div>
          {versionDeadline && (
            <div className="text-[11px] text-[var(--ink-muted)] -mt-1">版本截止日期：<span className="text-red-500 font-medium">{versionDeadline}</span></div>
          )}
          {isOverdue && (
            <div className="rounded-lg bg-red-50 border border-red-200 p-3 space-y-2">
              <div className="text-[12px] text-red-700 font-medium">⚠ 结束日期超出版本截止日期，请说明原因</div>
              <textarea
                value={overdueReason}
                onChange={(e) => setOverdueReason(e.target.value)}
                rows={2}
                placeholder="例如：技术难点超预期、上游交付延误..."
                required
                className="w-full rounded-lg border border-red-200 bg-white px-3 py-2 text-[13px] focus:border-red-400 focus:outline-none resize-none"
              />
            </div>
          )}
          {showReqSelect && linkedRequirements && linkedRequirements.length > 0 && (
            <div>
              <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1.5 block">关联需求</label>
              <div className="max-h-[120px] overflow-y-auto rounded-lg border border-[var(--line)] p-2 space-y-1">
                {linkedRequirements.map((req) => (
                  <label key={req.id} className="flex items-center gap-2 rounded px-2 py-1 hover:bg-[var(--bg-subtle)] cursor-pointer text-[12px]">
                    <input type="checkbox" checked={selectedReqs.has(req.id)} onChange={() => { const s = new Set(selectedReqs); if (s.has(req.id)) s.delete(req.id); else s.add(req.id); setSelectedReqs(s); }} className="h-3.5 w-3.5 rounded" />
                    <span className="text-[var(--ink-muted)] font-mono">{req.code}</span>
                    <span className="text-[var(--ink)] truncate">{req.title}</span>
                  </label>
                ))}
              </div>
            </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} 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)]">{initial ? '保存' : '创建'}</button>
          </div>
        </form>
      </div>
    </div>
  );
}

function CompleteModal({ onClose, onSubmit }: {
  onClose: () => void;
  onSubmit: (result: { resultType: 'link' | 'file'; resultUrl?: string; resultFileName?: string; resultFileData?: string }) => void;
}) {
  const [resultType, setResultType] = useState<'link' | 'file'>('link');
  const [url, setUrl] = useState('');
  const [fileName, setFileName] = useState('');
  const [fileData, setFileData] = useState('');

  const handleFile = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    if (!file) return;
    setFileName(file.name);
    const reader = new FileReader();
    reader.onload = () => setFileData(reader.result as string);
    reader.readAsDataURL(file);
  };

  const canSubmit = resultType === 'link' ? url.trim().length > 0 : fileData.length > 0;

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/40" onClick={onClose}>
      <div className="w-full max-w-sm 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)]">提交成果</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>
        <div className="space-y-3">
          <div className="flex gap-2">
            <button type="button" onClick={() => setResultType('link')} className={`h-8 px-3 rounded-lg text-[12px] font-medium border transition-colors ${resultType === 'link' ? 'border-[var(--accent)] bg-[var(--accent-soft)] text-[var(--accent)]' : 'border-[var(--line)] text-[var(--ink-soft)]'}`}>链接</button>
            <button type="button" onClick={() => setResultType('file')} className={`h-8 px-3 rounded-lg text-[12px] font-medium border transition-colors ${resultType === 'file' ? 'border-[var(--accent)] bg-[var(--accent-soft)] text-[var(--accent)]' : 'border-[var(--line)] text-[var(--ink-soft)]'}`}>文件</button>
          </div>
          {resultType === 'link' ? (
            <input value={url} onChange={(e) => setUrl(e.target.value)} placeholder="https://..." 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" />
          ) : (
            <div>
              <input type="file" onChange={handleFile} className="text-[12px] text-[var(--ink-soft)]" />
              {fileName && <p className="text-[11px] text-[var(--ink-muted)] mt-1">已选：{fileName}</p>}
            </div>
          )}
          <div className="flex justify-end gap-2 pt-2">
            <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={() => onSubmit({ resultType, resultUrl: resultType === 'link' ? url.trim() : fileData, resultFileName: fileName || undefined, resultFileData: resultType === 'file' ? fileData : undefined })} 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">确认</button>
          </div>
        </div>
      </div>
    </div>
  );
}