'use client'

import React, { useState, useEffect } from 'react'
import { Card } from '@/components/ui/card'
import { ChevronDown, ChevronUp, Users, CheckCircle2, Package, InboxIcon, ChevronLeft, ChevronRight, Search } from 'lucide-react'
import { cn } from '@/lib/utils'
import { Button } from '@/components/ui/button'
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter, DialogDescription } from '@/components/ui/dialog'
import { updateBulkSubmissionPayment } from '@/app/actions'
import { format } from 'date-fns'

const ITEMS_PER_PAGE = 5

const formatRupiah = (value: number) =>
  new Intl.NumberFormat('id-ID', { style: 'currency', currency: 'IDR', maximumFractionDigits: 0 }).format(value)

export default function ReportByPersonGrid({ data, onUpdate }: { data: any[]; onUpdate: () => void }) {
  const [expandedRows, setExpandedRows] = useState<Record<string, boolean>>({})
  const [currentPage, setCurrentPage] = useState(1)
  const [searchQuery, setSearchQuery] = useState('')
  const [modalOpen, setModalOpen] = useState(false)
  const [saving, setSaving] = useState(false)
  const [target, setTarget] = useState<{ ids: string[]; label: string; amount: number }>({ ids: [], label: '', amount: 0 })

  // Reset page + search when data changes (e.g. filter changed)
  useEffect(() => {
    setCurrentPage(1)
    setExpandedRows({})
    setSearchQuery('')
  }, [data])

  // Reset page when search changes
  useEffect(() => {
    setCurrentPage(1)
  }, [searchQuery])

  const toggleRow = (id: string) =>
    setExpandedRows(prev => ({ ...prev, [id]: !prev[id] }))

  // Group by user
  const usersMap = new Map<string, any>()
  data.forEach(order => {
    order.submissions.forEach((sub: any) => {
      if (!usersMap.has(sub.user.id)) {
        usersMap.set(sub.user.id, {
          user: sub.user,
          totalPiutang: 0,
          totalPaid: 0,
          submissions: []
        })
      }
      const obj = usersMap.get(sub.user.id)
      const amount = Number(sub.bill) || 0
      if (sub.payment_status !== 'LUNAS') obj.totalPiutang += amount
      else obj.totalPaid += amount
      obj.submissions.push({ ...sub, orderTitle: order.title, orderDate: order.date })
    })
  })

  const userList = Array.from(usersMap.values())
    .map(obj => ({
      ...obj,
      // Sort each person's PO list by order date, newest first
      submissions: [...obj.submissions].sort(
        (a: any, b: any) => new Date(b.orderDate).getTime() - new Date(a.orderDate).getTime()
      )
    }))
    .sort((a, b) => b.totalPiutang - a.totalPiutang)

  const q = searchQuery.toLowerCase().trim()
  const filteredUserList = q
    ? userList.filter(u => u.user.name?.toLowerCase().includes(q))
    : userList

  const totalPages = Math.ceil(filteredUserList.length / ITEMS_PER_PAGE)
  const paginatedList = filteredUserList.slice((currentPage - 1) * ITEMS_PER_PAGE, currentPage * ITEMS_PER_PAGE)

  const openModal = (e: React.MouseEvent, ids: string[], label: string, amount: number) => {
    e.stopPropagation()
    setTarget({ ids, label, amount })
    setModalOpen(true)
  }

  const handleConfirm = async () => {
    if (!target.ids.length) return
    setSaving(true)
    const res = await updateBulkSubmissionPayment(target.ids, 'LUNAS')
    setSaving(false)
    if (res.success) {
      setModalOpen(false)
      onUpdate()
    }
  }

  return (
    <>
      <Card className="rounded-2xl border border-slate-200/90 dark:border-slate-800 bg-white dark:bg-slate-900 shadow-sm overflow-hidden">
        <div className="bg-slate-50/50 dark:bg-slate-800/40 px-4 py-3 border-b border-slate-100 dark:border-slate-800 flex flex-col sm:flex-row sm:items-center gap-3">
          <div className="flex items-center gap-2 flex-1">
            <Users className="w-4 h-4 text-[#1B2CC1] shrink-0" />
            <h3 className="text-sm font-black text-slate-800 dark:text-slate-200">Detail Piutang Berdasarkan Orang</h3>
          </div>
          <div className="flex items-center gap-2 bg-white dark:bg-slate-900 border border-slate-200 dark:border-slate-700 rounded-lg px-3 py-1.5 w-full sm:w-48">
            <Search className="w-3.5 h-3.5 text-slate-400 shrink-0" />
            <input
              type="text"
              placeholder="Cari nama pemesan..."
              value={searchQuery}
              onChange={e => setSearchQuery(e.target.value)}
              className="text-xs font-medium bg-transparent border-none outline-none w-full text-slate-700 dark:text-slate-200 placeholder:text-slate-400"
            />
          </div>
        </div>

        {userList.length === 0 ? (
          <div className="flex flex-col items-center justify-center py-16 gap-3 text-slate-400">
            <InboxIcon className="w-10 h-10 opacity-40" />
            <p className="text-sm font-semibold">Tidak ada data pemesan di periode ini.</p>
          </div>
        ) : filteredUserList.length === 0 ? (
          <div className="flex flex-col items-center justify-center py-16 gap-3 text-slate-400">
            <Search className="w-10 h-10 opacity-40" />
            <p className="text-sm font-semibold">Tidak ada hasil untuk &quot;{searchQuery}&quot;.</p>
          </div>
        ) : (
          <>
            <div className="overflow-x-auto">
              <table className="w-full text-sm text-left">
                <thead className="text-xs text-slate-500 uppercase bg-slate-50/30 dark:bg-slate-900/50">
                  <tr>
                    <th className="px-6 py-4 font-bold w-8"></th>
                    <th className="px-6 py-4 font-bold">Nama Pemesan</th>
                    <th className="px-6 py-4 font-bold text-center">Total PO</th>
                    <th className="px-6 py-4 font-bold text-right">Total Piutang</th>
                    <th className="px-6 py-4 font-bold text-center">Aksi</th>
                  </tr>
                </thead>
                <tbody className="divide-y divide-slate-100 dark:divide-slate-800">
                  {paginatedList.map((userObj) => {
                    const isExpanded = !!expandedRows[userObj.user.id]
                    const unpaid = userObj.submissions.filter((s: any) => s.payment_status !== 'LUNAS')

                    return (
                      <React.Fragment key={userObj.user.id}>
                        <tr
                          onClick={() => toggleRow(userObj.user.id)}
                          className={cn(
                            'hover:bg-slate-50/50 dark:hover:bg-slate-800/40 cursor-pointer transition-colors group',
                            isExpanded && 'bg-slate-50/30 dark:bg-slate-800/20'
                          )}
                        >
                          <td className="px-6 py-4">
                            <button className="text-slate-400 group-hover:text-[#1B2CC1] transition-colors p-1 rounded-full hover:bg-blue-50 dark:hover:bg-blue-900/30">
                              {isExpanded ? <ChevronUp className="w-4 h-4" /> : <ChevronDown className="w-4 h-4" />}
                            </button>
                          </td>
                          <td className="px-6 py-4">
                            <div className="flex items-center gap-3">
                              {userObj.user.photo ? (
                                <img src={userObj.user.photo} alt={userObj.user.name} className="w-8 h-8 rounded-full object-cover ring-2 ring-slate-100 dark:ring-slate-800" />
                              ) : (
                                <div className="w-8 h-8 rounded-full bg-[#1B2CC1]/10 text-[#1B2CC1] flex items-center justify-center font-bold text-xs ring-2 ring-slate-100 dark:ring-slate-800">
                                  {userObj.user.name.charAt(0).toUpperCase()}
                                </div>
                              )}
                              <p className="font-bold text-slate-800 dark:text-slate-200">{userObj.user.name}</p>
                            </div>
                          </td>
                          <td className="px-6 py-4 text-center font-semibold text-slate-600 dark:text-slate-400">
                            {userObj.submissions.length} PO
                          </td>
                          <td className="px-6 py-4 text-right">
                            {userObj.totalPiutang > 0 ? (
                              <p className="font-black text-rose-600 dark:text-rose-400">{formatRupiah(userObj.totalPiutang)}</p>
                            ) : (
                              <p className="font-bold text-emerald-600 dark:text-emerald-400">Lunas Semua</p>
                            )}
                            {userObj.totalPaid > 0 && (
                              <p className="text-[10px] text-slate-500 font-semibold mt-0.5">Lunas: {formatRupiah(userObj.totalPaid)}</p>
                            )}
                          </td>
                          <td className="px-6 py-4 text-center">
                            {unpaid.length > 0 ? (
                              <Button
                                onClick={(e) => openModal(e, unpaid.map((s: any) => s.id), `Semua tagihan ${userObj.user.name}`, userObj.totalPiutang)}
                                size="sm"
                                className="h-8 text-[11px] font-bold bg-[#1B2CC1] text-white hover:bg-[#121E85] shadow-sm shadow-[#1B2CC1]/30 gap-1 px-3"
                              >
                                <CheckCircle2 className="w-3.5 h-3.5" /> Lunasi Semua
                              </Button>
                            ):( <span className="text-[10px] font-bold text-slate-400">Selesai</span>)}
                          </td>
                        </tr>

                        {isExpanded && (
                          <tr className="bg-slate-50 dark:bg-slate-900/60">
                            <td colSpan={5} className="px-6 py-5 border-l-4 border-l-[#1B2CC1]">
                              <div className="pl-8 space-y-3">
                                <h4 className="text-[11px] font-bold uppercase tracking-wider text-slate-500 flex items-center gap-1.5">
                                  <Package className="w-3.5 h-3.5" /> Rincian Hutang per PO
                                </h4>
                                <div className="overflow-hidden border border-slate-200/80 dark:border-slate-700 rounded-xl bg-white dark:bg-slate-800">
                                  <table className="w-full text-xs">
                                    <thead className="bg-slate-100/50 dark:bg-slate-700/30 text-slate-500 uppercase font-semibold">
                                      <tr>
                                        <th className="px-4 py-2.5 text-left">Judul PO</th>
                                        <th className="px-4 py-2.5 text-left">Tgl Order</th>
                                        <th className="px-4 py-2.5 text-left">Status</th>
                                        <th className="px-4 py-2.5 text-right">Tagihan</th>
                                        <th className="px-4 py-2.5 text-center">Aksi</th>
                                      </tr>
                                    </thead>
                                    <tbody className="divide-y divide-slate-100 dark:divide-slate-700/50">
                                      {userObj.submissions.map((sub: any) => {
                                        const isUnpaid = sub.payment_status !== 'LUNAS'
                                        return (
                                          <tr key={sub.id}>
                                            <td className="px-4 py-2.5 font-bold text-slate-800 dark:text-slate-200">{sub.orderTitle}</td>
                                            <td className="px-4 py-2.5 text-slate-500 font-medium">
                                              {format(new Date(sub.orderDate), 'dd MMM yyyy')}
                                            </td>
                                            <td className="px-4 py-2.5">
                                              <span className={cn(
                                                'text-[9px] font-bold px-1.5 py-0.5 rounded uppercase',
                                                !isUnpaid
                                                  ? 'text-emerald-700 bg-emerald-100 dark:text-emerald-400 dark:bg-emerald-950/40'
                                                  : 'text-rose-700 bg-rose-100 dark:text-rose-400 dark:bg-rose-950/40'
                                              )}>
                                                {isUnpaid ? 'Belum' : 'Lunas'}
                                              </span>
                                            </td>
                                            <td className={cn('px-4 py-2.5 text-right font-black', isUnpaid ? 'text-rose-600 dark:text-rose-400' : 'text-emerald-600 dark:text-emerald-400')}>
                                              {sub.bill ? formatRupiah(sub.bill) : 'Rp0'}
                                            </td>
                                            <td className="px-4 py-2.5 text-center">
                                              {isUnpaid ? (
                                                <Button
                                                  onClick={(e) => openModal(e, [sub.id], `PO: ${sub.orderTitle}`, Number(sub.bill) || 0)}
                                                  variant="outline"
                                                  size="sm"
                                                  className="h-6 text-[10px] px-2 font-bold border-[#1B2CC1]/40 text-[#1B2CC1] hover:bg-[#1B2CC1] hover:text-white transition-colors"
                                                >
                                                  Lunasi
                                                </Button>
                                              ) : (
                                                <span className="text-[10px] font-bold text-slate-400">Selesai</span>
                                              )}
                                            </td>
                                          </tr>
                                        )
                                      })}
                                    </tbody>
                                  </table>
                                </div>
                              </div>
                            </td>
                          </tr>
                        )}
                      </React.Fragment>
                    )
                  })}
                </tbody>
              </table>
            </div>

            {/* Pagination */}
            {totalPages > 1 && (
              <div className="flex items-center justify-between px-6 py-4 bg-slate-50/50 dark:bg-slate-900/50 border-t border-slate-100 dark:border-slate-800">
                <p className="text-xs font-medium text-slate-500">
                  Halaman <span className="font-bold text-slate-700 dark:text-slate-300">{currentPage}</span> dari{' '}
                  <span className="font-bold text-slate-700 dark:text-slate-300">{totalPages}</span>
                </p>
                <div className="flex items-center gap-1">
                  <button onClick={() => setCurrentPage(p => Math.max(1, p - 1))} disabled={currentPage === 1} className="p-1.5 rounded-lg border border-slate-200 dark:border-slate-700 disabled:opacity-40 hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors">
                    <ChevronLeft className="w-3.5 h-3.5" />
                  </button>
                  <button onClick={() => setCurrentPage(p => Math.min(totalPages, p + 1))} disabled={currentPage === totalPages} className="p-1.5 rounded-lg border border-slate-200 dark:border-slate-700 disabled:opacity-40 hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors">
                    <ChevronRight className="w-3.5 h-3.5" />
                  </button>
                </div>
              </div>
            )}
          </>
        )}
      </Card>

      {/* Confirmation Modal */}
      <Dialog open={modalOpen} onOpenChange={setModalOpen}>
        <DialogContent className="sm:max-w-md rounded-2xl">
          <DialogHeader>
            <DialogTitle className="text-xl font-black text-slate-900 dark:text-white flex items-center gap-2">
              <CheckCircle2 className="w-6 h-6 text-emerald-500" />
              Konfirmasi Pelunasan
            </DialogTitle>
            <DialogDescription className="text-slate-500 pt-2">
              Tandai <strong className="text-slate-800 dark:text-slate-200">{target.label}</strong> sebagai <strong>LUNAS</strong>?
            </DialogDescription>
          </DialogHeader>
          <div className="bg-slate-50 dark:bg-slate-900/50 p-4 rounded-xl border border-slate-100 dark:border-slate-800 my-2">
            <p className="text-xs font-bold text-slate-500 uppercase tracking-wider mb-1">Total Nominal</p>
            <p className="text-2xl font-black text-emerald-600 dark:text-emerald-400">{formatRupiah(target.amount)}</p>
          </div>
          <DialogFooter className="gap-2 sm:gap-0">
            <Button variant="outline" onClick={() => setModalOpen(false)} disabled={saving} className="rounded-xl font-bold">
              Batal
            </Button>
            <Button onClick={handleConfirm} disabled={saving} className="rounded-xl font-bold bg-emerald-600 hover:bg-emerald-700 text-white shadow-md shadow-emerald-600/20">
              {saving ? 'Menyimpan...' : 'Ya, Simpan Pelunasan'}
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </>
  )
}