'use client';

import { useEffect, useMemo, useState } from 'react';
import { useParams, useRouter } from 'next/navigation';
import { ChevronLeft, Package, Calendar, Clock, Users, Tag, ChevronDown } from 'lucide-react';
import { useProductStore } from '@/stores/useProductStore';
import { useRequirementStore } from '@/stores/useRequirementStore';
import { useOvertimeStore } from '@/stores/useOvertimeStore';
import { useVersionPlanStore } from '@/stores/useVersionPlanStore';
import { useDevTaskStore } from '@/stores/useDevTaskStore';
import { useTestCaseStore } from '@/stores/useTestCaseStore';
import { useBugStore } from '@/stores/useBugStore';
import { useAuthStore } from '@/stores/useAuthStore';
import { useMemberStore } from '@/stores/useMemberStore';
import { getProjectDetail, VersionWithContext } from '@/lib/derive';
import { Stage, Role, STAGES, ROLES, STAGE_INDEX, ROLE_LABEL } from '@/lib/stage';
import { VersionStatus, VERSION_STATUS_LABEL, VERSION_STATUS_BG } from '@/lib/version-status';
import { calcGroupProgress as calcDevTaskProgress, aggregateDevTaskHours } from '@/lib/dev-task';
import { CapsuleStages } from '@/components/version/CapsuleStages';
import { MemberChips } from '@/components/version/MemberChips';
import { ProjectMemberPanel } from '@/components/project/ProjectMemberPanel';
import { getRequirementCoverageSummary, type VersionPlan } from '@/lib/version-plan';
import { buildVersionTimelineSummary, calcStageEffortMetrics, formatVersionOverviewDateTime, getVersionCardDefaultExpanded, mergeStageProgressWithEffort } from '@/lib/version-overview';
import { calcScopedVersionProgress } from '@/lib/version-progress';
import { buildVersionDataScopeMap, type VersionDataScope } from '@/lib/version-data-scope';
import { formatActualDuration } from '@/lib/work-hours';
import type { DevTask } from '@/lib/dev-task';
import type { TestCase } from '@/lib/test-case';
import type { Bug } from '@/lib/bug';

/* ─── StatCard ─── */
function StatCard({ value, label }: { value: number | string; label: string }) {
  return (
    <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4">
      <div className="text-2xl font-bold text-[var(--ink)]">{value}</div>
      <div className="text-xs text-[var(--ink-muted)] mt-1">{label}</div>
    </div>
  );
}

function HoursStatCard({ estimate, actual }: { estimate: number; actual: number }) {
  const overrun = actual > estimate && estimate > 0;
  const underrun = actual > 0 && actual < estimate;
  const tone = overrun ? 'text-red-600' : underrun ? 'text-emerald-600' : 'text-[var(--ink)]';
  const dayStr = (h: number) => {
    const d = h / 8;
    return Number.isInteger(d) ? String(d) : d.toFixed(1).replace(/\.0$/, '');
  };
  return (
    <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4">
      <div className="flex items-baseline gap-1.5">
        <span className={`text-2xl font-bold tabular-nums ${tone}`}>{actual > 0 ? `${actual}h` : '—'}</span>
        <span className="text-xs text-[var(--ink-muted)] tabular-nums">/ {estimate}h</span>
      </div>
      <div className="text-xs text-[var(--ink-muted)] mt-1">
        实际 / 预计耗时{estimate > 0 && <span className="ml-1">（{actual > 0 ? `${dayStr(actual)} / ` : ''}{dayStr(estimate)}天）</span>}
      </div>
    </div>
  );
}

/* ─── ProgressBar (for expanded released cards) ─── */
function ProgressBar({ role, percent, daysSpent }: { role: Role; percent: number; daysSpent: number }) {
  return (
    <div className="flex items-center gap-2">
      <span className="w-12 text-xs text-[var(--ink-soft)] shrink-0">{ROLE_LABEL[role]}</span>
      <div className="flex-1 h-2 rounded-full bg-zinc-100 overflow-hidden">
        <div className="h-full rounded-full bg-blue-500 transition-all" style={{ width: `${percent}%` }} />
      </div>
      <span className="text-xs text-[var(--ink-muted)] w-8 text-right">{percent}%</span>
      <span className="text-xs text-[var(--ink-muted)] w-10 text-right">
        {daysSpent === 0 ? '-' : `${daysSpent}天`}
      </span>
    </div>
  );
}

/* ─── VersionCard ─── */
function VersionCard({ version, progress, scope, onNavigate }: {
  version: VersionWithContext;
  progress: number;
  scope: VersionDataScope;
  onNavigate: (id: string) => void;
}) {
  const [expanded, setExpanded] = useState(() => getVersionCardDefaultExpanded(version.status));

  useEffect(() => {
    setExpanded(getVersionCardDefaultExpanded(version.status));
  }, [version.status]);

  const versionData = useMemo(() => ({
    vPlans: scope.plans,
    vDevTasks: scope.devTasks,
    vTCs: scope.testCases,
    vBugs: scope.bugs,
  }), [scope]);

  const stageEffortMetrics = useMemo(() => calcStageEffortMetrics({
    plans: versionData.vPlans,
    devTasks: versionData.vDevTasks,
    testCases: versionData.vTCs,
    bugs: versionData.vBugs,
  }), [versionData]);

  const timelineSummary = useMemo(() => buildVersionTimelineSummary({
    status: version.status,
    startDate: version.startDate,
    expectedReleaseDate: version.expectedReleaseDate,
    releaseDate: version.releaseDate,
    plans: versionData.vPlans,
    devTasks: versionData.vDevTasks,
    testCases: versionData.vTCs,
    bugs: versionData.vBugs,
  }), [version, versionData]);

  // 状态胶囊数据 — 与版本详情一致
  const stageProgress = useMemo(() => {
    const { vPlans, vDevTasks, vTCs, vBugs } = versionData;
    const sp: Partial<Record<Stage, { percent: number; status: 'idle' | 'active' | 'done' }>> = {};

    const calcGroupProgress = (group: VersionPlan[], type: 'research' | 'product' | 'ui') => {
      if (group.length === 0) return 0;
      let totalItems = 0;
      let doneItems = 0;
      for (const p of group) {
        if (type === 'research') {
          const tasks = p.tasks || [];
          const count = Math.max(tasks.length, 1);
          totalItems += count;
          if (p.status === 'completed') doneItems += count;
          else doneItems += tasks.filter((t) => t.status === 'completed').length;
        } else {
          const summary = getRequirementCoverageSummary(p);
          const count = Math.max(summary.total, 1);
          totalItems += count;
          if (p.status === 'completed') doneItems += count;
          else {
            doneItems += summary.completed;
          }
        }
      }
      return totalItems > 0 ? Math.round((doneItems / totalItems) * 100) : 0;
    };

    const getPlanStatus = (group: VersionPlan[]): 'idle' | 'active' | 'done' => {
      if (group.length === 0) return 'idle';
      if (group.every((p) => p.status === 'completed')) return 'done';
      if (group.some((p) => p.status === 'in_progress')) return 'active';
      return 'idle';
    };

    const research = vPlans.filter((p) => p.type === 'research');
    const product = vPlans.filter((p) => p.type === 'product');
    const ui = vPlans.filter((p) => p.type === 'ui');
    if (research.length > 0) sp['requirement'] = { percent: calcGroupProgress(research, 'research'), status: getPlanStatus(research) };
    if (product.length > 0) sp['product_design'] = { percent: calcGroupProgress(product, 'product'), status: getPlanStatus(product) };
    if (ui.length > 0) sp['ui_design'] = { percent: calcGroupProgress(ui, 'ui'), status: getPlanStatus(ui) };

    if (vDevTasks.length > 0) {
      const devProgress = calcDevTaskProgress(vDevTasks);
      const allSubmitted = vDevTasks.every((t) => t.status === 'submitted');
      const hasActive = vDevTasks.some((t) => t.status === 'in_progress' || t.status === 'testing');
      sp['dev'] = { percent: devProgress, status: allSubmitted ? 'done' : hasActive ? 'active' : 'idle' };
    }
    if (vTCs.length > 0) {
      const executed = vTCs.filter((c) => c.status === 'passed' || c.status === 'failed' || c.status === 'blocked').length;
      const tp = Math.round((executed / vTCs.length) * 100);
      const allPassed = vTCs.every((c) => c.status === 'passed');
      const hasRunning = vTCs.some((c) => c.status === 'running');
      sp['testing'] = { percent: tp, status: allPassed ? 'done' : (hasRunning || executed > 0) ? 'active' : 'idle' };
    }
    if (vBugs.length > 0) {
      const closedBugs = vBugs.filter((b) => b.status === 'closed' || b.status === 'rejected').length;
      const bp = Math.round((closedBugs / vBugs.length) * 100);
      const allClosed = vBugs.every((b) => b.status === 'closed' || b.status === 'rejected');
      sp['bug'] = { percent: bp, status: allClosed ? 'done' : closedBugs > 0 || vBugs.length > 0 ? 'active' : 'idle' };
    }
    return mergeStageProgressWithEffort(sp, stageEffortMetrics);
  }, [versionData, stageEffortMetrics]);

  const displayStatus = VERSION_STATUS_LABEL[version.status] ?? '开发中';
  const displayBg = VERSION_STATUS_BG[version.status] ?? 'bg-blue-500/10 text-blue-600';

  if (version.status === 'planned') {
    return (
      <div className="rounded-xl border border-dashed border-[var(--line)] px-4 py-3">
        <div className="flex items-center gap-2">
          <span onClick={() => onNavigate(version.id)} className="text-sm font-medium text-[var(--ink)] cursor-pointer hover:text-[var(--accent)]">{version.name}</span>
          <span className={`text-[11px] px-2 py-0.5 rounded-full ${displayBg}`}>{displayStatus}</span>
          <span className="text-[11px] text-[var(--ink-muted)]">暂无详情</span>
        </div>
      </div>
    );
  }

  if (!getVersionCardDefaultExpanded(version.status)) {
    return (
      <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] overflow-hidden">
        <button
          type="button"
          onClick={() => setExpanded(!expanded)}
          className="w-full flex items-center gap-3 px-4 py-3 text-left hover:bg-[var(--bg-hover)] transition-colors"
        >
          <span onClick={(e) => { e.stopPropagation(); onNavigate(version.id); }} className="text-sm font-medium text-[var(--ink)] cursor-pointer hover:text-[var(--accent)]">{version.name}</span>
          <span className={`text-[11px] px-2 py-0.5 rounded-full ${displayBg}`}>{displayStatus}</span>
          <span className="flex-1 text-[11px] text-[var(--ink-muted)] flex items-center gap-1">
            <Calendar className="h-3 w-3" />
            {formatVersionOverviewDateTime(timelineSummary.actualStartIso)}
            <span className="mx-1">→</span>
            {formatVersionOverviewDateTime(timelineSummary.isTerminalVersion ? timelineSummary.actualEndIso : timelineSummary.expectedReleaseIso)}
            <span className="ml-1">已耗时 {formatActualDuration(timelineSummary.actualHours)}</span>
          </span>
          <ChevronDown className={`h-3.5 w-3.5 text-[var(--ink-muted)] transition-transform ${expanded ? 'rotate-180' : ''}`} />
        </button>
        {expanded && (
          <div className="px-4 pb-4 pt-2 border-t border-[var(--line-soft)] space-y-3">
            <CapsuleStages stageProgress={stageProgress} />
            <MemberChips members={version.members ?? []} />
          </div>
        )}
      </div>
    );
  }

  return (
    <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4 shadow-sm">
      <div className="flex items-center gap-2 mb-3">
        <span onClick={() => onNavigate(version.id)} className="text-sm font-medium text-[var(--ink)] cursor-pointer hover:text-[var(--accent)]">{version.name}</span>
        <span className={`text-[11px] px-2 py-0.5 rounded-full ${displayBg}`}>{displayStatus}</span>
        <div className="flex-1 flex items-center gap-2 ml-2">
          <div className="flex-1 h-1.5 rounded-full bg-zinc-100 max-w-[160px]">
            <div className="h-1.5 rounded-full bg-blue-500 transition-all" style={{ width: `${progress}%` }} />
          </div>
          <span className="text-[11px] tabular-nums text-[var(--ink-muted)]">{progress}%</span>
        </div>
      </div>
      <div className="mb-3"><CapsuleStages stageProgress={stageProgress} /></div>
      <div className="flex items-center justify-between text-[11px] text-[var(--ink-muted)] mb-3 pb-3 border-b border-[var(--line-soft)]">
        <span className="flex items-center gap-1">
          <Calendar className="h-3 w-3" />
          {timelineSummary.actualStartIso ? formatVersionOverviewDateTime(timelineSummary.actualStartIso) : '未开始'}
          <span className="mx-1">→</span>
          预计 {timelineSummary.expectedReleaseIso ? formatVersionOverviewDateTime(timelineSummary.expectedReleaseIso) : '未设置'}
          <span className="mx-1">|</span>
          实际 {timelineSummary.isTerminalVersion ? (timelineSummary.actualEndIso ? formatVersionOverviewDateTime(timelineSummary.actualEndIso) : '未记录') : '未完成'}
        </span>
        <span className="flex items-center gap-1">
          <Clock className="h-3 w-3" />已耗时 {formatActualDuration(timelineSummary.actualHours)}
        </span>
      </div>
      <MemberChips members={version.members ?? []} />
    </div>
  );
}

/* ─── TeamSection (compact, overflow with tooltip) ─── */
function TeamSection({ teamByRole }: { teamByRole: Record<string, Record<string, number>> }) {
  const MAX_VISIBLE = 4;
  return (
    <section>
      <div className="flex items-center gap-2 mb-3">
        <Users className="h-4 w-4 text-[var(--ink-soft)]" />
        <h2 className="text-sm font-semibold text-[var(--ink)]">项目人员</h2>
      </div>
      <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] px-4 py-3">
        <div className="flex flex-wrap items-center gap-x-5 gap-y-2">
          {ROLES.map((role) => {
            const peopleMap = teamByRole[role.key] || {};
            const people = Object.entries(peopleMap).sort((a, b) => (b[1] as number) - (a[1] as number));
            if (people.length === 0) return null;
            const visible = people.slice(0, MAX_VISIBLE);
            const hidden = people.slice(MAX_VISIBLE);
            return (
              <div key={role.key} className="flex items-center gap-1.5">
                <span className="text-[11px] font-medium text-[var(--ink-muted)]">{role.label}</span>
                <div className="flex items-center gap-1">
                  {visible.map(([name, count]) => (
                    <span key={name} className="inline-flex items-center h-5 px-1.5 rounded bg-[var(--bg-subtle)] text-[11px] text-[var(--ink-soft)]">
                      {name}<span className="text-[var(--ink-muted)] ml-0.5">{'×'}{count as number}</span>
                    </span>
                  ))}
                  {hidden.length > 0 && (
                    <span className="relative group">
                      <span className="inline-flex items-center h-5 px-1.5 rounded bg-[var(--bg-subtle)] text-[11px] text-[var(--ink-muted)] cursor-default">
                        +{hidden.length}
                      </span>
                      <span className="absolute bottom-full left-1/2 -translate-x-1/2 mb-1.5 hidden group-hover:flex flex-col items-center z-10">
                        <span className="whitespace-nowrap rounded-lg bg-zinc-800 px-2.5 py-1.5 text-[11px] text-white shadow-lg">
                          {hidden.map(([n, c]) => `${n}(×${c})`).join(', ')}
                        </span>
                        <span className="h-1.5 w-1.5 rotate-45 bg-zinc-800 -mt-1" />
                      </span>
                    </span>
                  )}
                </div>
              </div>
            );
          })}
        </div>
      </div>
    </section>
  );
}

/* ─── Status Filter ─── */
const FILTER_OPTIONS: { key: string; label: string }[] = [
  { key: 'all', label: '全部' },
  { key: 'requirement', label: '调研' },
  { key: 'product_design', label: '产品设计' },
  { key: 'ui_design', label: 'UI设计' },
  { key: 'dev', label: '开发' },
  { key: 'testing', label: '测试' },
  { key: 'released', label: '已发布' },
  { key: 'planned', label: '规划中' },
];

/* ─── Main Page ─── */
export default function ProjectDetailPage() {
  const params = useParams();
  const router = useRouter();
  const projectId = params.id as string;
  const { overview, fetchOverview } = useProductStore();
  const { requirements, fetchRequirements } = useRequirementStore();
  const { records, fetchRecords } = useOvertimeStore();
  const { plans, fetchPlans } = useVersionPlanStore();
  const { tasks: devTasks, fetchTasks: fetchDevTasks } = useDevTaskStore();
  const { testCases, fetchTestCases } = useTestCaseStore();
  const { bugs, fetchBugs } = useBugStore();
  const [statusFilter, setStatusFilter] = useState<string>('all');

  useEffect(() => { fetchOverview(); }, [fetchOverview]);
  useEffect(() => { fetchRequirements(); }, [fetchRequirements]);
  useEffect(() => { fetchRecords(); }, [fetchRecords]);
  useEffect(() => { fetchPlans(); }, [fetchPlans]);
  useEffect(() => { fetchDevTasks(); }, [fetchDevTasks]);
  useEffect(() => { fetchTestCases(); }, [fetchTestCases]);

  const project = useMemo(() => getProjectDetail(overview, projectId), [overview, projectId]);

  const user = useAuthStore((s) => s.user);
  const currentUserName = user?.name || '';
  const { roles } = useMemberStore();
  const isSuperAdmin = useMemo(() => {
    const r = roles.find((x) => x.id === user?.roleId);
    return !!r && r.permissions.includes('*');
  }, [roles, user?.roleId]);

  const sortedVersions = useMemo(() => {
    if (!project) return [];
    let list = [...project.versions];
    // 只显示当前用户参与的版本（members为空时所有人可见；超管可见全部）
    if (!isSuperAdmin) {
      list = list.filter((v) => {
        const ms = v.members ?? [];
        if (ms.length === 0) return true;
        return ms.some((m) => m.name === currentUserName);
      });
    }
    if (statusFilter !== 'all') {
      if (statusFilter === 'planned') {
        list = list.filter((v) => v.status === 'planned');
      } else if (statusFilter === 'released') {
        list = list.filter((v) => v.status === 'released');
      } else {
        list = list.filter((v) => v.status === 'developing' && v.currentStage === statusFilter);
      }
    }
    return list.sort((a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime());
  }, [project, statusFilter, isSuperAdmin, currentUserName]);

  // Compute actual overall progress per version
  const versionScopeMap = useMemo(
    () => project ? buildVersionDataScopeMap({
      versionIds: project.versions.map((version) => version.id),
      plans,
      requirements,
      devTasks,
      testCases,
      bugs,
    }) : {},
    [project, plans, requirements, devTasks, testCases, bugs],
  );

  const versionProgressMap = useMemo(
    () => Object.fromEntries(
      Object.entries(versionScopeMap).map(([id, scope]) => [
        id,
        calcScopedVersionProgress(scope.plans, scope.devTasks, scope.testCases),
      ]),
    ),
    [versionScopeMap],
  );

  const stats = useMemo(() => {
    if (!project) return { total: 0, released: 0, reqCount: 0, bugCount: 0, estimateHours: 0, actualHours: 0 };
    const total = project.versions.length;
    const released = project.versions.filter((v) => v.status === 'released').length;
    const reqCount = requirements.filter((r) => r.projectId === projectId).length;
    const versionScopes = Object.values(versionScopeMap);
    const bugCount = versionScopes.reduce((sum, scope) => sum + scope.bugs.length, 0);
    const projectDevTasks = versionScopes.flatMap((scope) => scope.devTasks);
    const { estimate, actual } = aggregateDevTaskHours(projectDevTasks);
    return { total, released, reqCount, bugCount, estimateHours: estimate, actualHours: actual };
  }, [project, requirements, projectId, versionScopeMap]);

  const teamByRole = useMemo(() => {
    if (!project) return {} as Record<string, Record<string, number>>;
    const map: Record<string, Record<string, number>> = {};
    ROLES.forEach((r) => (map[r.key] = {}));
    project.versions.forEach((v) => {
      (v.members ?? []).forEach((m) => {
        if (!map[m.role]) map[m.role] = {};
        map[m.role][m.name] = (map[m.role][m.name] || 0) + 1;
      });
    });
    return map;
  }, [project]);

  if (!project) {
    return (
      <div className="flex h-full flex-col items-center justify-center gap-3">
        <p className="text-sm text-[var(--ink-muted)]">项目不存在</p>
        <button onClick={() => router.push('/projects')} className="text-xs text-[var(--accent)] hover:underline">返回项目列表</button>
      </div>
    );
  }

  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">
          <button onClick={() => router.push('/projects')} className="flex items-center gap-1 rounded-md px-1.5 py-1 text-[12px] text-[var(--ink-muted)] hover:bg-[var(--bg-subtle)] hover:text-[var(--ink)]">
            <ChevronLeft className="h-3.5 w-3.5" strokeWidth={2} />项目
          </button>
          <span className="ml-2 text-[var(--ink-muted)]">/</span>
          <span className="ml-2 text-[15px] font-semibold text-[var(--ink)]">{project.name}</span>
        </div>
        <div className="flex items-center gap-1.5 rounded-full bg-[var(--bg-subtle)] px-2.5 py-1 text-xs text-[var(--ink-soft)]">
          <Package className="h-3 w-3" /><span>{project.productName}</span>
        </div>
      </header>

      <div className="flex-1 overflow-y-auto p-5 bg-[var(--bg)]">
        <div className="space-y-5">
          <div className="grid grid-cols-5 gap-4">
            <StatCard value={stats.total} label="总版本数" />
            <StatCard value={stats.released} label="已开发" />
            <StatCard value={stats.reqCount} label="需求数" />
            <StatCard value={stats.bugCount} label="Bug 总数" />
            <HoursStatCard estimate={stats.estimateHours} actual={stats.actualHours} />
          </div>

          <TeamSection teamByRole={teamByRole} />

          <ProjectMemberPanel projectId={projectId} />

          <section>
            <div className="flex items-center justify-between mb-3">
              <div className="flex items-center gap-2">
                <Tag className="h-4 w-4 text-[var(--ink-soft)]" />
                <h2 className="text-sm font-semibold text-[var(--ink)]">版本记录</h2>
              </div>
              <div className="flex items-center gap-0.5 rounded-lg bg-[var(--bg-subtle)] p-0.5">
                {FILTER_OPTIONS.map((opt) => (
                  <button
                    key={opt.key}
                    onClick={() => setStatusFilter(opt.key)}
                    className={`px-2.5 py-1 rounded-md text-[11px] font-medium transition-colors ${statusFilter === opt.key ? 'bg-[var(--bg-card)] text-[var(--ink)] shadow-sm' : 'text-[var(--ink-muted)] hover:text-[var(--ink-soft)]'}`}
                  >
                    {opt.label}
                  </button>
                ))}
              </div>
            </div>
            <div className="space-y-2.5">
              {sortedVersions.length === 0 ? (
                <div className="rounded-xl border border-dashed border-[var(--line)] p-6 text-center text-xs text-[var(--ink-muted)]">暂无版本</div>
              ) : (
                sortedVersions.map((v) => <VersionCard key={v.id} version={v} progress={versionProgressMap[v.id] ?? 0} scope={versionScopeMap[v.id]} onNavigate={(id) => router.push(`/versions/${id}`)} />)
              )}
            </div>
          </section>
        </div>
      </div>
    </div>
  );
}