'use client';

import { useEffect, useMemo, useState } from 'react';
import { useRouter } from 'next/navigation';
import { Search, FileText, Palette, Layout, ClipboardList, Check, ExternalLink, Link2, FileUp, Code2, ClipboardCheck, Bug as BugIcon } from 'lucide-react';
import { useProductStore } from '@/stores/useProductStore';
import { useVersionPlanStore } from '@/stores/useVersionPlanStore';
import { useRequirementStore } from '@/stores/useRequirementStore';
import { useDevTaskStore } from '@/stores/useDevTaskStore';
import { useTaskCategoryStore } from '@/stores/useTaskCategoryStore';
import { useTestCaseStore } from '@/stores/useTestCaseStore';
import { useBugStore } from '@/stores/useBugStore';
import { useAuthStore } from '@/stores/useAuthStore';
import { flattenVersions } from '@/lib/derive';
import { calcPlanProgress, calcLinkedReqProgress } from '@/lib/version-plan';
import { DEV_TASK_STATUS_LABEL, DEV_TASK_STATUS_COLOR, formatHours } from '@/lib/dev-task';
import { TEST_CASE_STATUS_LABEL, TEST_CASE_STATUS_COLOR } from '@/lib/test-case';
import { BUG_STATUS_LABEL, BUG_STATUS_COLOR, BUG_SEVERITY_LABEL, BUG_SEVERITY_COLOR } from '@/lib/bug';
import type { PlanTask, VersionPlan } from '@/lib/version-plan';
import type { DevTask } from '@/lib/dev-task';

type TabKey = 'all' | 'research' | 'product' | 'ui' | 'devTask' | 'testCase' | 'bug';

const TABS: { key: TabKey; label: string; icon: any }[] = [
  { key: 'all', label: '全部待办', icon: ClipboardList },
  { key: 'research', label: '调研', icon: Search },
  { key: 'product', label: '产品方案', icon: FileText },
  { key: 'ui', label: 'UI设计', icon: Palette },
  { key: 'devTask', label: '开发任务', icon: Code2 },
  { key: 'testCase', label: '测试用例', icon: ClipboardCheck },
  { key: 'bug', label: 'Bug', icon: BugIcon },
];

export default function WorkspacePage() {
  const router = useRouter();
  const { overview, fetchOverview } = useProductStore();
  const { plans, fetchPlans, updatePlan, completePlan } = useVersionPlanStore();
  const { requirements, fetchRequirements } = useRequirementStore();
  const { tasks: devTasks, fetchTasks } = useDevTaskStore();
  const { categories, fetchCategories } = useTaskCategoryStore();
  const { testCases, fetchTestCases } = useTestCaseStore();
  const { bugs, fetchBugs } = useBugStore();
  const user = useAuthStore((s) => s.user);
  const [activeTab, setActiveTab] = useState<TabKey>('all');
  const [completingPlan, setCompletingPlan] = useState<VersionPlan | null>(null);

  useEffect(() => { fetchOverview(); }, [fetchOverview]);
  useEffect(() => { fetchPlans(); }, [fetchPlans]);
  useEffect(() => { fetchRequirements(); }, [fetchRequirements]);
  useEffect(() => { fetchTasks(); }, [fetchTasks]);
  useEffect(() => { fetchCategories(); }, [fetchCategories]);
  useEffect(() => { fetchTestCases(); }, [fetchTestCases]);
  useEffect(() => { fetchBugs(); }, [fetchBugs]);

  const userName = user?.name ?? '';
  const allVersions = useMemo(() => flattenVersions(overview), [overview]);

  // 我负责的所有未完成计划
  const myPlans = useMemo(() =>
    plans.filter((p) => p.owner === userName && p.status !== 'completed'),
    [plans, userName]
  );

  // 我负责的所有未完成开发任务
  const myDevTasks = useMemo(() =>
    devTasks.filter((t) => t.assigneeId === userName && t.status !== 'submitted'),
    [devTasks, userName]
  );

  // 我负责的待执行/执行中/失败测试用例
  const myTestCases = useMemo(() =>
    testCases.filter((c) => c.assigneeId === userName && (c.status === 'pending' || c.status === 'running' || c.status === 'failed')),
    [testCases, userName]
  );

  // 我负责的未关闭 Bug
  const myBugs = useMemo(() =>
    bugs.filter((b) => b.assigneeId === userName && b.status !== 'closed' && b.status !== 'rejected'),
    [bugs, userName]
  );

  const counts = {
    all: myPlans.length + myDevTasks.length + myTestCases.length + myBugs.length,
    research: myPlans.filter((p) => p.type === 'research').length,
    product: myPlans.filter((p) => p.type === 'product').length,
    ui: myPlans.filter((p) => p.type === 'ui').length,
    devTask: myDevTasks.length,
    testCase: myTestCases.length,
    bug: myBugs.length,
  };

  const filtered = activeTab === 'all' ? myPlans : (activeTab === 'devTask' || activeTab === 'testCase' || activeTab === 'bug') ? [] : myPlans.filter((p) => p.type === activeTab);
  const today = new Date().toISOString().slice(0, 10);

  const toggleTask = (plan: VersionPlan, task: PlanTask) => {
    const next: PlanTask['status'] = task.status === 'pending' ? 'in_progress' : task.status === 'in_progress' ? 'completed' : 'pending';
    const updatedTasks = (plan.tasks || []).map((t) => t.id === task.id ? { ...t, status: next } : t);
    updatePlan(plan.id, { tasks: updatedTasks });
  };

  return (
    <div className="flex h-full">
      {/* 左侧：分组 */}
      <div className="w-60 shrink-0 border-r border-[var(--line)] bg-[var(--bg-card)] flex flex-col">
        <div className="flex h-14 items-center px-5 border-b border-[var(--line)]">
          <h1 className="text-[15px] font-semibold text-[var(--ink)]">与我相关</h1>
        </div>
        <nav className="flex-1 p-3 space-y-1">
          {TABS.map((tab) => {
            const Icon = tab.icon;
            const count = counts[tab.key];
            const active = activeTab === tab.key;
            return (
              <button
                key={tab.key}
                onClick={() => setActiveTab(tab.key)}
                className={`w-full flex items-center gap-2.5 px-3 py-2 rounded-lg text-[13px] transition-colors ${
                  active
                    ? 'bg-[var(--accent-soft)] text-[var(--accent)] font-medium'
                    : 'text-[var(--ink-soft)] hover:bg-[var(--bg-subtle)]'
                }`}
              >
                <Icon className="h-3.5 w-3.5" />
                <span className="flex-1 text-left">{tab.label}</span>
                <span className={`text-[11px] tabular-nums px-1.5 py-0.5 rounded ${active ? 'bg-[var(--accent)] text-white' : 'bg-[var(--bg-subtle)] text-[var(--ink-muted)]'}`}>
                  {count}
                </span>
              </button>
            );
          })}
        </nav>
      </div>

      {/* 右侧：待办列表 */}
      <div className="flex-1 flex flex-col overflow-hidden">
        <header className="flex h-14 shrink-0 items-center border-b border-[var(--line)] bg-[var(--bg-card)] px-5">
          <h2 className="text-[14px] font-semibold text-[var(--ink)]">
            {TABS.find((t) => t.key === activeTab)?.label}
          </h2>
          <span className="ml-2 text-[12px] text-[var(--ink-muted)]">{activeTab === 'devTask' ? myDevTasks.length : activeTab === 'testCase' ? myTestCases.length : activeTab === 'bug' ? myBugs.length : filtered.length} 项</span>
        </header>

        <div className="flex-1 overflow-y-auto p-5 bg-[var(--bg)] space-y-3">
          {activeTab === 'devTask' ? (
            myDevTasks.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)]">暂无开发任务</p>
              </div>
            ) : (
              myDevTasks.map((task) => {
                const cat = categories.find((c) => c.id === task.categoryId);
                const req = requirements.find((r) => r.id === task.requirementId);
                return (
                  <div key={task.id} className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4">
                    <div className="flex items-center justify-between mb-2">
                      <div className="flex items-center gap-2">
                        <span className={`text-[10px] font-medium px-2 py-0.5 rounded-full ${DEV_TASK_STATUS_COLOR[task.status]}`}>
                          {DEV_TASK_STATUS_LABEL[task.status]}
                        </span>
                        {task.isBlocked && <span className="text-[10px] text-red-500 bg-red-50 px-1.5 py-0.5 rounded">阻塞</span>}
                        <span className="text-[11px] font-mono text-[var(--ink-muted)]">{task.taskNo}</span>
                        <span className="text-[14px] font-medium text-[var(--ink)]">{task.title}</span>
                      </div>
                      <span className="text-[11px] text-[var(--ink-muted)]">{task.priority}</span>
                    </div>
                    <div className="flex items-center gap-4 text-[11px] text-[var(--ink-muted)]">
                      {req && <span>{req.code} {req.title}</span>}
                      {cat && <span className="px-1.5 py-0.5 rounded text-[10px]" style={{ backgroundColor: cat.color ? `${cat.color}15` : undefined, color: cat.color }}>{cat.name}</span>}
                      <span>预计 {formatHours(task.estimateHours)}</span>
                      {task.actualHours > 0 && <span>已投入 {task.actualHours}h</span>}
                      {task.dueDate && <span>截止 {task.dueDate}</span>}
                    </div>
                  </div>
                );
              })
            )
          ) : activeTab === 'testCase' ? (
            myTestCases.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)]">暂无测试用例</p>
              </div>
            ) : (
              myTestCases.map((tc) => (
                <div key={tc.id} className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4">
                  <div className="flex items-center justify-between mb-2">
                    <div className="flex items-center gap-2">
                      <span className={`text-[10px] font-medium px-2 py-0.5 rounded-full ${TEST_CASE_STATUS_COLOR[tc.status]}`}>
                        {TEST_CASE_STATUS_LABEL[tc.status]}
                      </span>
                      <span className="text-[11px] font-mono text-[var(--ink-muted)]">{tc.caseNo}</span>
                      <span className="text-[14px] font-medium text-[var(--ink)]">{tc.title}</span>
                    </div>
                    <span className="text-[11px] text-[var(--ink-muted)]">{tc.priority}</span>
                  </div>
                </div>
              ))
            )
          ) : activeTab === 'bug' ? (
            myBugs.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)]">暂无 Bug</p>
              </div>
            ) : (
              myBugs.map((bug) => (
                <div key={bug.id} className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4">
                  <div className="flex items-center justify-between mb-2">
                    <div className="flex items-center gap-2">
                      <span className={`text-[10px] font-medium px-2 py-0.5 rounded-full ${BUG_STATUS_COLOR[bug.status]}`}>
                        {BUG_STATUS_LABEL[bug.status]}
                      </span>
                      <span className={`text-[10px] px-1.5 py-0.5 rounded ${BUG_SEVERITY_COLOR[bug.severity]}`}>{BUG_SEVERITY_LABEL[bug.severity]}</span>
                      <span className="text-[11px] font-mono text-[var(--ink-muted)]">{bug.bugNo}</span>
                      <span className="text-[14px] font-medium text-[var(--ink)]">{bug.title}</span>
                    </div>
                    <span className="text-[11px] text-[var(--ink-muted)]">{bug.priority}</span>
                  </div>
                </div>
              ))
            )
          ) : filtered.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)]">暂无待办事项</p>
            </div>
          ) : (
            filtered.map((plan) => {
              const version = allVersions.find((v) => v.id === plan.versionId);
              const isActive = plan.startTime <= today;
              const typeLabel = plan.type === 'research' ? '调研' : plan.type === 'product' ? '产品方案' : 'UI设计';
              const linkedReqs = (plan.linkedRequirementIds || []).map((id) => requirements.find((r) => r.id === id)).filter(Boolean) as { id: string; code: string; title: string }[];

              return (
                <PlanCard
                  key={plan.id}
                  plan={plan}
                  versionName={version?.name}
                  versionInfo={version ? `${version.productName} / ${version.projectName}` : '-'}
                  versionId={version?.id}
                  typeLabel={typeLabel}
                  isActive={isActive}
                  linkedReqs={linkedReqs}
                  onToggleTask={(task) => toggleTask(plan, task)}
                  onToggleReq={(reqId) => {
                    const current = plan.completedRequirementIds || [];
                    const next = current.includes(reqId) ? current.filter((id) => id !== reqId) : [...current, reqId];
                    updatePlan(plan.id, { completedRequirementIds: next });
                  }}
                  onAddTask={(title) => {
                    const newTask: PlanTask = { id: `task-${Date.now()}`, title, status: 'pending' };
                    updatePlan(plan.id, { tasks: [...(plan.tasks || []), newTask] });
                  }}
                  onComplete={() => setCompletingPlan(plan)}
                  onJumpVersion={() => version && router.push(`/versions/${version.id}`)}
                  onUpdate={(data) => updatePlan(plan.id, data)}
                />
              );
            })
          )}
        </div>
      </div>

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

function PlanCard({ plan, versionName, versionInfo, versionId, typeLabel, isActive, linkedReqs, onToggleTask, onToggleReq, onAddTask, onComplete, onJumpVersion, onUpdate }: {
  plan: VersionPlan;
  versionName?: string;
  versionInfo: string;
  versionId?: string;
  typeLabel: string;
  isActive: boolean;
  linkedReqs: { id: string; code: string; title: string }[];
  onToggleTask: (task: PlanTask) => void;
  onToggleReq: (reqId: string) => void;
  onAddTask: (title: string) => void;
  onComplete: () => void;
  onJumpVersion: () => void;
  onUpdate: (data: Partial<VersionPlan>) => void;
}) {
  const [newTaskTitle, setNewTaskTitle] = useState('');
  const isResearch = plan.type === 'research';
  const progress = isResearch
    ? calcPlanProgress(plan.tasks)
    : calcLinkedReqProgress(plan.linkedRequirementIds, plan.completedRequirementIds);
  const allReqsDone = !isResearch && plan.linkedRequirementIds && plan.linkedRequirementIds.length > 0 && progress === 100;

  return (
    <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4">
      <div className="flex items-center justify-between mb-2">
        <div className="flex items-center gap-2">
          <span className={`text-[10px] font-medium px-2 py-0.5 rounded-full ${isActive ? 'bg-blue-50 text-blue-600' : 'bg-zinc-100 text-zinc-500'}`}>
            {isActive ? '进行中' : '未开始'}
          </span>
          <span className="text-[10px] text-[var(--ink-muted)] px-1.5 py-0.5 rounded bg-[var(--bg-subtle)]">{typeLabel}</span>
          <span className="text-[14px] font-medium text-[var(--ink)]">{plan.title}</span>
        </div>
        <div className="flex items-center gap-2">
          {(allReqsDone || (isResearch && plan.tasks && plan.tasks.length > 0)) && (
            <button onClick={onComplete} className="h-7 px-3 rounded-md text-[11px] font-medium bg-[var(--accent)] text-white hover:bg-[var(--accent-hover)]">
              提交完成
            </button>
          )}
        </div>
      </div>

      <div className="flex items-center gap-4 text-[11px] text-[var(--ink-muted)] mb-3">
        <span>{versionInfo} / </span>
        <button onClick={onJumpVersion} className="text-[var(--accent)] hover:underline">{versionName || '版本'}</button>
        <span>{plan.startTime.slice(0, 10)} → {plan.endTime.slice(0, 10)}</span>
        {progress > 0 && <span className="font-medium text-[var(--ink-soft)]">{progress}%</span>}
      </div>

      {/* 进度条 */}
      {((isResearch && plan.tasks && plan.tasks.length > 0) || (!isResearch && plan.linkedRequirementIds && plan.linkedRequirementIds.length > 0)) && (
        <div className="mb-3 h-1.5 rounded-full bg-[var(--bg-subtle)] overflow-hidden">
          <div className="h-full rounded-full bg-[var(--accent)] transition-all" style={{ width: `${progress}%` }} />
        </div>
      )}

      {/* 调研：任务清单 */}
      {isResearch && (
        <div className="space-y-1.5">
          {(plan.tasks || []).map((task) => (
            <div key={task.id} className="flex items-center gap-2 px-2 py-1 rounded hover:bg-[var(--bg-subtle)]">
              <button
                onClick={() => onToggleTask(task)}
                className={`h-4 w-4 rounded border flex items-center justify-center shrink-0 transition-colors ${
                  task.status === 'completed' ? 'bg-[var(--accent)] border-[var(--accent)]' :
                  task.status === 'in_progress' ? 'border-blue-400 bg-blue-50' :
                  'border-[var(--line)]'
                }`}
              >
                {task.status === 'completed' && <Check className="h-2.5 w-2.5 text-white" strokeWidth={3} />}
                {task.status === 'in_progress' && <div className="h-1.5 w-1.5 rounded-full bg-blue-500" />}
              </button>
              <span className={`flex-1 text-[12px] ${task.status === 'completed' ? 'line-through text-[var(--ink-muted)]' : 'text-[var(--ink)]'}`}>
                {task.title}
              </span>
              <span className={`text-[10px] ${task.status === 'completed' ? 'text-green-600' : task.status === 'in_progress' ? 'text-blue-600' : 'text-[var(--ink-muted)]'}`}>
                {task.status === 'completed' ? '已完成' : task.status === 'in_progress' ? '进行中' : '未开始'}
              </span>
            </div>
          ))}
          <div className="flex gap-2 mt-2">
            <input
              value={newTaskTitle}
              onChange={(e) => setNewTaskTitle(e.target.value)}
              onKeyDown={(e) => { if (e.key === 'Enter' && newTaskTitle.trim()) { onAddTask(newTaskTitle.trim()); setNewTaskTitle(''); } }}
              placeholder="添加任务，回车确认"
              className="flex-1 h-7 rounded-lg border border-[var(--line)] bg-[var(--bg)] px-3 text-[12px] focus:border-[var(--accent)] focus:outline-none"
            />
          </div>
        </div>
      )}

      {/* 产品方案/UI：关联需求清单 */}
      {!isResearch && linkedReqs.length > 0 && (
        <div className="space-y-1.5">
          {linkedReqs.map((req) => {
            const isDone = (plan.completedRequirementIds || []).includes(req.id);
            return (
              <div key={req.id} className="flex items-center gap-2 px-2 py-1 rounded hover:bg-[var(--bg-subtle)]">
                <button
                  onClick={() => onToggleReq(req.id)}
                  className={`h-4 w-4 rounded border flex items-center justify-center shrink-0 transition-colors ${isDone ? 'bg-[var(--accent)] border-[var(--accent)]' : 'border-[var(--line)]'}`}
                >
                  {isDone && <Check className="h-2.5 w-2.5 text-white" strokeWidth={3} />}
                </button>
                <span className="text-[11px] font-mono text-[var(--ink-muted)]">{req.code}</span>
                <span className={`flex-1 text-[12px] ${isDone ? 'line-through text-[var(--ink-muted)]' : 'text-[var(--ink)]'}`}>{req.title}</span>
              </div>
            );
          })}
          {allReqsDone && (
            <div className="mt-2 rounded-lg bg-green-50 border border-green-200 px-3 py-2 text-[12px] text-green-700">
              所有需求已完成，请提交原型成果
            </div>
          )}
        </div>
      )}
      {!isResearch && linkedReqs.length === 0 && (
        <div className="text-[12px] text-[var(--ink-muted)] py-2">
          未关联需求，<button onClick={onJumpVersion} className="text-[var(--accent)] hover:underline">前往版本详情</button>关联
        </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()}>
        <h3 className="text-[13px] font-semibold text-[var(--ink)] mb-4">提交成果</h3>
        <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)]'}`}><Link2 className="h-3 w-3 inline mr-1" />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)]'}`}><FileUp className="h-3 w-3 inline mr-1" />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>
  );
}