// List + Detail phiếu Duyệt NCC — 3-panel: List | Detail tabs | Workflow + history.
// URL params: type (filter A/B), pendingMe (1=inbox), id (selected), q (search).
// Plan AG Phase 1 (S26 2026-05-21) — Tree view 2-level Project > Gói thầu > PE
// UAT feedback bro Tra Sol: flat list "đám rừng" → Outlook folder structure.
// FE-only group view (no schema change) — Phase 2 ProjectPackage defer sau UAT confirm.
import { useMemo, useState } from 'react'
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
import { useNavigate, useSearchParams } from 'react-router-dom'
import { toast } from 'sonner'
import { ClipboardCheck, Search, X } from 'lucide-react'
import { Input } from '@/components/ui/Input'
import { Select } from '@/components/ui/Select'
import { EmptyState } from '@/components/EmptyState'
import { api } from '@/lib/api'
import { getErrorMessage } from '@/lib/apiError'
import { cn } from '@/lib/cn'
import type { Paged } from '@/types/master'
import {
  PeDisplayStatus,
  PeDisplayStatusColor,
  PeDisplayStatusLabel,
  PurchaseEvaluationPhase,
  PurchaseEvaluationTypeLabel,
  getPeDisplayStatus,
  type PeDetailBundle,
  type PeListItem,
} from '@/types/purchaseEvaluation'
import { PeDetailTabs } from '@/components/pe/PeDetailTabs'
import { PeWorkflowPanel } from '@/components/pe/PeWorkflowPanel'

export function PurchaseEvaluationsListPage() {
  const navigate = useNavigate()
  const qc = useQueryClient()
  const [sp, setSp] = useSearchParams()
  const typeFilter = sp.get('type') ? Number(sp.get('type')) : null
  const pendingMe = sp.get('pendingMe') === '1'
  const search = sp.get('q') ?? ''
  const phase = sp.get('phase') ?? ''
  const approvalWorkflowId = sp.get('awId') ?? ''       // Mig 23 — filter quy trình
  const selectedId = sp.get('id')

  // Mig 23 — list quy trình duyệt V2 cho dropdown filter (filter theo type screen)
  const approvalWorkflows = useQuery({
    queryKey: ['approval-workflows-v2-filter', typeFilter],
    queryFn: async () => {
      if (!typeFilter) return []
      const res = await api.get<{ types: { applicableType: number; history: { id: string; code: string; version: number; name: string; isActive: boolean }[] }[] }>(
        '/approval-workflows-v2',
        { params: { applicableType: typeFilter } },
      )
      return res.data.types.find(t => t.applicableType === typeFilter)?.history ?? []
    },
    enabled: !!typeFilter,
  })

  const list = useQuery({
    queryKey: ['pe-list', { typeFilter, pendingMe, search, phase, approvalWorkflowId }],
    queryFn: async () => {
      if (pendingMe) {
        const res = await api.get<PeListItem[]>('/purchase-evaluations/inbox', {
          params: {
            type: typeFilter ?? undefined,
            approvalWorkflowId: approvalWorkflowId || undefined,
          },
        })
        return { items: res.data, total: res.data.length, page: 1, pageSize: res.data.length }
      }
      const res = await api.get<Paged<PeListItem>>('/purchase-evaluations', {
        params: {
          pageSize: 50,
          search: search || undefined,
          type: typeFilter ?? undefined,
          phase: phase || undefined,
          approvalWorkflowId: approvalWorkflowId || undefined,
        },
      })
      return res.data
    },
  })

  const detail = useQuery({
    queryKey: ['pe-detail', selectedId],
    queryFn: async () => (await api.get<PeDetailBundle>(`/purchase-evaluations/${selectedId}`)).data,
    enabled: !!selectedId,
  })

  const del = useMutation({
    mutationFn: async (id: string) => api.delete(`/purchase-evaluations/${id}`),
    onSuccess: () => {
      toast.success('Đã xóa phiếu.')
      setParam('id', null)
      qc.invalidateQueries({ queryKey: ['pe-list'] })
    },
    onError: e => toast.error(getErrorMessage(e)),
  })

  function setParam(key: string, value: string | null) {
    const next = new URLSearchParams(sp)
    if (value == null || value === '') next.delete(key)
    else next.set(key, value)
    if (key !== 'id') next.delete('page')
    setSp(next, { replace: key === 'q' })
  }

  function selectRow(id: string) {
    if (typeof window !== 'undefined' && window.matchMedia('(min-width: 1024px)').matches) {
      setParam('id', id)
    } else {
      navigate(`/purchase-evaluations/${id}`)
    }
  }

  const allRows = list.data?.items ?? []
  // Duyệt (pendingMe) → filter cứng client-side chỉ "Đã gửi duyệt" (Nháp/Trả lại/
  // Đã duyệt/Từ chối loại bỏ). BE /inbox hiện loose UAT có thể trả phiếu Nháp →
  // FE filter để UX đúng kỳ vọng. Phân quyền strict V2 BE pending Session 18+.

  // S59 — anh Kiệt FDC (Zalo 2026-06-11) + anh chốt follow-up: tree 4 tầng
  // "Năm (tạo phiếu) > Dự án > Hạng mục công việc > Phiếu cần duyệt".
  // Hạng mục từ WorkItemId Mig 49, phiếu cũ chưa gắn → "(Chưa gắn hạng mục)".
  // NCC bỏ khỏi tree — vẫn hiện ở card/detail. Filter pendingMe TRƯỚC group.
  // Sort: Năm DESC + Dự án A-Z (vi) + Hạng mục A-Z (vi) + PE createdAt DESC.
  type WorkItemGroup = {
    workItemId: string | null
    workItemName: string
    items: PeListItem[]
  }
  type ProjectGroup = {
    projectId: string | null
    projectName: string
    workItems: WorkItemGroup[]
    totalCount: number
  }
  type YearGroup = {
    year: number
    projects: ProjectGroup[]
    totalCount: number
  }
  const yearGroups = useMemo<YearGroup[]>(() => {
    const filtered = pendingMe
      ? allRows.filter(p => getPeDisplayStatus(p.phase) === PeDisplayStatus.DaGuiDuyet)
      : allRows
    const yearMap = new Map<number, YearGroup>()
    for (const p of filtered) {
      const year = new Date(p.createdAt).getFullYear()
      if (!yearMap.has(year)) {
        yearMap.set(year, { year, projects: [], totalCount: 0 })
      }
      const yg = yearMap.get(year)!
      const projKey = p.projectId ?? '__no_project__'
      const projName = p.projectName?.trim() || '(Dự án đã xoá)'
      let pg = yg.projects.find(g => (g.projectId ?? '__no_project__') === projKey)
      if (!pg) {
        pg = { projectId: p.projectId ?? null, projectName: projName, workItems: [], totalCount: 0 }
        yg.projects.push(pg)
      }
      const wiKey = p.workItemId ?? '__no_workitem__'
      const wiName = p.workItemName?.trim() || '(Chưa gắn hạng mục)'
      let wg = pg.workItems.find(w => (w.workItemId ?? '__no_workitem__') === wiKey)
      if (!wg) {
        wg = { workItemId: p.workItemId ?? null, workItemName: wiName, items: [] }
        pg.workItems.push(wg)
      }
      wg.items.push(p)
      pg.totalCount++
      yg.totalCount++
    }
    const arr = Array.from(yearMap.values())
    arr.sort((a, b) => b.year - a.year)
    for (const yg of arr) {
      yg.projects.sort((a, b) => a.projectName.localeCompare(b.projectName, 'vi'))
      for (const pg of yg.projects) {
        // S59 — numeric:true vì tên PMH bắt đầu bằng STT không pad ("2 Mat…" < "10 Mat…")
        pg.workItems.sort((a, b) => a.workItemName.localeCompare(b.workItemName, 'vi', { numeric: true }))
        for (const wg of pg.workItems) {
          wg.items.sort((a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime())
        }
      }
    }
    return arr
  }, [allRows, pendingMe])

  // Total row count cho header badge (pendingMe đếm filtered, Danh sách đếm BE total).
  const totalRowCount = yearGroups.reduce((sum, yg) => sum + yg.totalCount, 0)

  // Plan AG2 — Expand state localStorage Set<string>. Default empty Set (all collapse).
  // S59 key v3: node scheme chốt "Năm > Dự án > Hạng mục" → key v1/v2 vô nghĩa.
  const STORAGE_KEY = 'pe_list_expanded_projects_v3'
  const [expandedSet, setExpandedSet] = useState<Set<string>>(() => {
    try {
      const raw = localStorage.getItem(STORAGE_KEY)
      return raw ? new Set(JSON.parse(raw) as string[]) : new Set<string>()
    } catch {
      return new Set<string>()
    }
  })
  const isExpanded = (key: string) => expandedSet.has(key)
  const toggleExpand = (key: string, open: boolean) => {
    setExpandedSet(prev => {
      const next = new Set(prev)
      if (open) next.add(key)
      else next.delete(key)
      try { localStorage.setItem(STORAGE_KEY, JSON.stringify([...next])) } catch {}
      return next
    })
  }

  const headerTitle = typeFilter
    ? (pendingMe ? `${PurchaseEvaluationTypeLabel[typeFilter]} — Chờ duyệt` : PurchaseEvaluationTypeLabel[typeFilter])
    : pendingMe ? 'Duyệt NCC — Chờ tôi' : 'Quy trình Duyệt NCC'

  return (
    <div className="flex h-[calc(100vh-4rem)] flex-col">
      <header className="flex shrink-0 flex-wrap items-center justify-between gap-3 border-b border-slate-200 bg-white px-6 py-3">
        <div className="flex items-center gap-2">
          <ClipboardCheck className="h-5 w-5 text-slate-500" />
          <h1 className="text-base font-semibold tracking-tight text-slate-900">{headerTitle}</h1>
          <span className="ml-2 rounded-full bg-slate-100 px-2 py-0.5 text-[11px] font-medium text-slate-600">
            {pendingMe ? totalRowCount : (list.data?.total ?? 0)}
          </span>
        </div>
      </header>

      <div className="grid flex-1 grid-cols-1 overflow-hidden lg:grid-cols-[400px_1fr_360px]">
        {/* Panel 1: List */}
        <aside className="flex flex-col overflow-hidden border-r border-slate-200 bg-white">
          <div className="space-y-2 border-b border-slate-200 p-3">
            <div className="relative">
              <Search className="pointer-events-none absolute left-2.5 top-2.5 h-4 w-4 text-slate-400" />
              <Input
                value={search}
                onChange={e => setParam('q', e.target.value)}
                placeholder="Tìm mã / tên gói thầu / dự án…"
                className="pl-8"
              />
            </div>
            {/* Mig 23 — Dropdown quy trình duyệt CHỈ ở "Duyệt" (pendingMe).
                Danh sách giữ nguyên (chỉ filter trạng thái) — user feedback
                muốn Danh sách show hết phiếu không filter quy trình. */}
            {pendingMe && (
              <Select value={approvalWorkflowId} onChange={e => setParam('awId', e.target.value)}>
                <option value="">Tất cả quy trình duyệt</option>
                {approvalWorkflows.data?.map(w => (
                  <option key={w.id} value={w.id}>
                    {w.code} v{String(w.version).padStart(2, '0')} — {w.name}
                  </option>
                ))}
              </Select>
            )}
            {/* Duyệt (pendingMe) → filter cứng "Đã gửi duyệt", ẩn dropdown trạng thái.
                Danh sách (pendingMe=false) → giữ dropdown cho user filter mọi trạng thái. */}
            {pendingMe ? (
              <div className="rounded border border-amber-200 bg-amber-50 px-2 py-1.5 text-[11px] text-amber-700">
                Lọc cố định: <strong>Đã gửi duyệt</strong> (phiếu đang chờ duyệt)
              </div>
            ) : (
              <Select value={phase} onChange={e => setParam('phase', e.target.value)}>
                <option value="">Tất cả trạng thái</option>
                {Object.values(PeDisplayStatus).map(s => {
                  const phaseValue = s === PeDisplayStatus.Nhap
                    ? String(PurchaseEvaluationPhase.DangSoanThao)
                    : s === PeDisplayStatus.DaDuyet
                    ? String(PurchaseEvaluationPhase.DaDuyet)
                    : s === PeDisplayStatus.TraLai
                    ? String(PurchaseEvaluationPhase.TraLai)
                    : s === PeDisplayStatus.TuChoi
                    ? String(PurchaseEvaluationPhase.TuChoi)
                    : '' // DaGuiDuyet — multi-phase, không filter exact (TODO BE)
                  return phaseValue ? (
                    <option key={s} value={phaseValue}>{PeDisplayStatusLabel[s]}</option>
                  ) : null
                })}
              </Select>
            )}
          </div>

          <div className="flex-1 overflow-y-auto">
            {list.isLoading && (
              <div className="space-y-2 p-3">
                {Array.from({ length: 6 }).map((_, i) => (
                  <div key={i} className="h-16 animate-pulse rounded-md bg-slate-100" />
                ))}
              </div>
            )}
            {!list.isLoading && yearGroups.length === 0 && (
              <div className="p-6">
                <EmptyState icon={ClipboardCheck} title="Chưa có phiếu" description="Tạo phiếu mới để bắt đầu quy trình." />
              </div>
            )}
            {/* S59 — Tree view chốt: 📅 Năm (bg-slate-50) > 📁 Dự án > 🧱 Hạng mục công việc > PE card.
                3 layer <details>, named groups group/year + group/proj + group/wi cho chevron rotation. */}
            <div className="divide-y divide-slate-100">
              {yearGroups.map(yg => {
                const yearKey = `y${yg.year}`
                return (
                  <details
                    key={yearKey}
                    open={isExpanded(yearKey)}
                    onToggle={e => toggleExpand(yearKey, (e.currentTarget as HTMLDetailsElement).open)}
                    className="group/year"
                  >
                    <summary className="flex cursor-pointer items-center gap-1.5 bg-slate-50 px-3 py-2 hover:bg-slate-100 [&::-webkit-details-marker]:hidden">
                      <svg className="h-3 w-3 shrink-0 text-slate-500 transition-transform group-open/year:rotate-90" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" /></svg>
                      <span className="text-base">📅</span>
                      <span className="flex-1 truncate text-[13px] font-semibold text-slate-900">Năm {yg.year}</span>
                      <span className="rounded-full bg-slate-200 px-2 py-0.5 text-[10px] font-medium text-slate-700">{yg.totalCount}</span>
                    </summary>
                    <div className="ml-3 border-l border-slate-200">
                      {yg.projects.map(pg => {
                        const projKey = `${yearKey}::p${pg.projectId ?? '_none_'}`
                        return (
                          <details
                            key={projKey}
                            open={isExpanded(projKey)}
                            onToggle={e => toggleExpand(projKey, (e.currentTarget as HTMLDetailsElement).open)}
                            className="group/proj"
                          >
                            <summary className="flex cursor-pointer items-center gap-1.5 px-3 py-1.5 hover:bg-slate-50 [&::-webkit-details-marker]:hidden">
                              <svg className="h-3 w-3 shrink-0 text-slate-400 transition-transform group-open/proj:rotate-90" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" /></svg>
                              <span className="text-sm">📁</span>
                              <span className="flex-1 truncate text-[12px] font-medium text-slate-700">{pg.projectName}</span>
                              <span className="rounded bg-slate-100 px-1.5 py-0.5 text-[10px] text-slate-600">{pg.totalCount}</span>
                            </summary>
                            <div className="ml-3 border-l border-slate-200">
                              {pg.workItems.map(wg => {
                                const wiKey = `${projKey}::w${wg.workItemId ?? '_none_'}`
                                return (
                                  <details
                                    key={wiKey}
                                    open={isExpanded(wiKey)}
                                    onToggle={e => toggleExpand(wiKey, (e.currentTarget as HTMLDetailsElement).open)}
                                    className="group/wi"
                                  >
                                    <summary className="flex cursor-pointer items-center gap-1.5 px-3 py-1.5 hover:bg-slate-50 [&::-webkit-details-marker]:hidden">
                                      <svg className="h-3 w-3 shrink-0 text-slate-400 transition-transform group-open/wi:rotate-90" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" /></svg>
                                      <span className="text-sm">🧱</span>
                                      <span className={cn('flex-1 truncate text-[12px]', wg.workItemId ? 'font-medium text-slate-700' : 'italic text-slate-400')}>{wg.workItemName}</span>
                                      <span className="rounded bg-slate-100 px-1.5 py-0.5 text-[10px] text-slate-600">{wg.items.length}</span>
                                    </summary>
                                    <ul className="ml-3 divide-y divide-slate-100 border-l border-slate-200">
                                      {wg.items.map(p => (
                                        <li key={p.id}>
                                          <button
                                            onClick={() => selectRow(p.id)}
                                            className={cn(
                                              'block w-full px-3 py-2 text-left transition hover:bg-slate-50',
                                              selectedId === p.id && 'bg-brand-50 ring-1 ring-inset ring-brand-200',
                                            )}
                                          >
                                            {/* Plan AG6 — compact card 3 row: title+badge / mã+time / drafter+dept+contract */}
                                            <div className="flex items-start justify-between gap-2">
                                              <div className="min-w-0 flex-1 truncate text-[13px] font-medium text-slate-900">{p.tenGoiThau}</div>
                                              <span
                                                className={cn(
                                                  'shrink-0 rounded px-1.5 py-0.5 text-[10px] font-medium',
                                                  PeDisplayStatusColor[getPeDisplayStatus(p.phase)],
                                                )}
                                              >
                                                {PeDisplayStatusLabel[getPeDisplayStatus(p.phase)]}
                                              </span>
                                            </div>
                                            <div className="mt-0.5 flex items-center gap-1.5 text-[11px] text-slate-500">
                                              <span className="font-mono">{p.maPhieu ?? '—'}</span>
                                              <span className="text-slate-300">·</span>
                                              {/* S23 t2 UAT: BE list sort theo UpdatedAt DESC (fallback CreatedAt). */}
                                              <span title={`Tạo lúc ${new Date(p.createdAt).toLocaleString('vi-VN')}`}>
                                                {new Date(p.createdAt).toLocaleString('vi-VN', {
                                                  day: '2-digit', month: '2-digit', year: 'numeric',
                                                  hour: '2-digit', minute: '2-digit',
                                                })}
                                              </span>
                                            </div>
                                            {(p.drafterName || p.departmentName || p.contractId) && (
                                              <div className="mt-0.5 flex items-center justify-between gap-2 text-[11px]">
                                                <span className="min-w-0 flex-1 truncate text-slate-500">
                                                  {p.drafterName && <>👤 {p.drafterName}</>}
                                                  {p.drafterName && p.departmentName && <span className="text-slate-300"> · </span>}
                                                  {p.departmentName && <span className="text-slate-400">{p.departmentName}</span>}
                                                </span>
                                                {p.contractId && <span className="shrink-0 text-[10px] font-medium text-brand-600">✓ HĐ</span>}
                                              </div>
                                            )}
                                          </button>
                                        </li>
                                      ))}
                                    </ul>
                                  </details>
                                )
                              })}
                            </div>
                          </details>
                        )
                      })}
                    </div>
                  </details>
                )
              })}
            </div>
          </div>
        </aside>

        {/* Panel 2: Detail tabs */}
        <main className="hidden overflow-y-auto bg-slate-50 p-6 lg:block">
          {!selectedId && (
            <EmptyState icon={ClipboardCheck} title="Chọn phiếu ở danh sách" description="Chi tiết NCC + báo giá + duyệt sẽ hiển thị ở đây." />
          )}
          {selectedId && detail.isLoading && <div className="text-sm text-slate-500">Đang tải…</div>}
          {selectedId && detail.data && (
            <PeDetailTabs
              evaluation={detail.data}
              onBack={() => setParam('id', null)}
              onDelete={() => del.mutate(detail.data!.id)}
              readOnly={true}
            />
          )}
        </main>

        {/* Panel 3: Workflow + history */}
        {/* Danh sách (pendingMe=false) → readOnly=true → ẩn Chuyển tiếp transition.
            Duyệt (pendingMe=true) → readOnly=false → cho approver chuyển phase. */}
        <aside className="hidden overflow-y-auto border-l border-slate-200 bg-white p-4 lg:block">
          {!selectedId && (
            <div className="rounded-lg border border-dashed border-slate-200 p-6 text-center text-sm text-slate-400">
              <X className="mx-auto mb-2 h-5 w-5" />
              Quy trình duyệt sẽ hiện khi chọn phiếu.
            </div>
          )}
          {selectedId && detail.data && <PeWorkflowPanel evaluation={detail.data} readOnly={!pendingMe} />}
        </aside>
      </div>
    </div>
  )
}

// Fullpage detail route cho mobile (/purchase-evaluations/:id)
export function PurchaseEvaluationDetailPage() {
  const navigate = useNavigate()
  const id = location.pathname.split('/').pop()!
  const detail = useQuery({
    queryKey: ['pe-detail', id],
    queryFn: async () => (await api.get<PeDetailBundle>(`/purchase-evaluations/${id}`)).data,
  })
  const del = useMutation({
    mutationFn: async () => api.delete(`/purchase-evaluations/${id}`),
    onSuccess: () => {
      toast.success('Đã xóa.')
      navigate('/purchase-evaluations')
    },
  })
  if (detail.isLoading) return <div className="p-6 text-sm text-slate-500">Đang tải…</div>
  if (!detail.data) return <div className="p-6 text-sm text-red-600">Không tìm thấy phiếu.</div>
  return (
    <div className="space-y-4 p-6">
      <PeDetailTabs evaluation={detail.data} onBack={() => navigate('/purchase-evaluations')} onDelete={() => del.mutate()} />
      <PeWorkflowPanel evaluation={detail.data} />
    </div>
  )
}