// 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).
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 { SlaTimer } from '@/components/SlaTimer'
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 },
        })
        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 rows = list.data?.items ?? []

  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">
            {list.data?.total ?? 0}
          </span>
        </div>
      </header>

      <div className="grid flex-1 grid-cols-1 overflow-hidden lg:grid-cols-[340px_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 — 2 dropdown tách: Quy trình duyệt + Trạng thái */}
            {!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>
            )}
            <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 && rows.length === 0 && (
              <div className="p-6">
                <EmptyState icon={ClipboardCheck} title="Chưa có phiếu" description="Tạo phiếu mới để bắt đầu quy trình." />
              </div>
            )}
            <ul className="divide-y divide-slate-100">
              {rows.map(p => (
                <li key={p.id}>
                  <button
                    onClick={() => selectRow(p.id)}
                    className={cn(
                      'block w-full px-3 py-2.5 text-left transition hover:bg-slate-50',
                      selectedId === p.id && 'bg-brand-50 ring-1 ring-inset ring-brand-200',
                    )}
                  >
                    <div className="flex items-start justify-between gap-2">
                      <div className="min-w-0 flex-1">
                        <div className="truncate text-[13px] font-medium text-slate-900">{p.tenGoiThau}</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>·</span>
                          <span className="truncate">{p.projectName}</span>
                        </div>
                        {p.selectedSupplierName && (
                          <div className="mt-0.5 truncate text-[11px] text-emerald-600">
                            ✓ {p.selectedSupplierName}
                          </div>
                        )}
                      </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-1 flex items-center justify-between text-[11px] text-slate-500">
                      <span className="rounded bg-slate-100 px-1.5 py-0.5 text-slate-600">
                        {PurchaseEvaluationTypeLabel[p.type]}
                      </span>
                      <SlaTimer deadline={p.slaDeadline} createdAt={p.createdAt} />
                    </div>
                    {p.contractId && (
                      <div className="mt-1 text-[10px] text-brand-600">✓ Đã tạo HĐ</div>
                    )}
                  </button>
                </li>
              ))}
            </ul>
          </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>
  )
}

