import { useMemo, useState } from 'react'
import { Link } from 'react-router-dom'
import { useTranslation } from 'react-i18next'
import { toast } from 'sonner'
import { CheckCircle2, Plus, Truck, XCircle } from 'lucide-react'
import { PageShell } from '@/layouts/PageShell'
import { Card, CardContent } from '@/components/ui/card'
import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from '@/components/ui/table'
import { Badge } from '@/components/ui/badge'
import { Button } from '@/components/ui/button'
import { ClearFiltersButton, FilterSelect, TableToolbar } from '@/components/table/TableToolbar'
import { RowActions } from '@/components/table/RowActions'
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog'
import { Label } from '@/components/ui/label'
import { SelectNative } from '@/components/ui/select-native'
import { useAuthStore } from '@/zustand/authStore'
import { branches, orders as seedOrders, riders } from '@/mocks/data'
import { formatEtb } from '@/lib/utils'
import type { Order } from '@/types'

export function OrdersPage() {
  const { t } = useTranslation()
  const user = useAuthStore((s) => s.user)
  const [rows, setRows] = useState<Order[]>([...seedOrders])
  const [q, setQ] = useState('')
  const [status, setStatus] = useState('all')
  const [fulfillment, setFulfillment] = useState('all')
  const [branchFilter, setBranchFilter] = useState('all')
  const [channel, setChannel] = useState('all')
  const [assignTarget, setAssignTarget] = useState<Order | null>(null)
  const [riderId, setRiderId] = useState('')

  const canPickBranch = user?.role !== 'pharmacist'

  const filtered = useMemo(() => {
    let list = rows
    if (user?.role === 'pharmacist' && user.branchId) {
      list = list.filter((o) => o.branchId === user.branchId)
    } else if (branchFilter !== 'all') {
      list = list.filter((o) => o.branchId === branchFilter)
    }
    if (status !== 'all') list = list.filter((o) => o.status === status)
    if (fulfillment !== 'all') list = list.filter((o) => o.fulfillment === fulfillment)
    if (channel !== 'all') list = list.filter((o) => o.channel === channel)
    if (q) {
      const needle = q.toLowerCase()
      list = list.filter(
        (o) => o.customerName.toLowerCase().includes(needle) || o.id.toLowerCase().includes(needle),
      )
    }
    return list
  }, [rows, user, q, status, fulfillment, branchFilter, channel])

  const filtersActive =
    status !== 'all' || fulfillment !== 'all' || branchFilter !== 'all' || channel !== 'all' || !!q

  const confirm = (orderId: string) => {
    setRows((prev) => prev.map((o) => (o.id === orderId ? { ...o, status: 'confirmed' } : o)))
    const target = seedOrders.find((o) => o.id === orderId)
    if (target) target.status = 'confirmed'
    toast.success('Order confirmed')
  }

  const cancel = (orderId: string) => {
    setRows((prev) => prev.map((o) => (o.id === orderId ? { ...o, status: 'cancelled' } : o)))
    toast.message('Order cancelled')
  }

  const saveAssign = () => {
    if (!assignTarget || !riderId) return
    setRows((prev) =>
      prev.map((o) =>
        o.id === assignTarget.id
          ? { ...o, assignedRiderId: riderId, status: 'out_for_delivery' }
          : o,
      ),
    )
    const target = seedOrders.find((o) => o.id === assignTarget.id)
    if (target) {
      target.assignedRiderId = riderId
      target.status = 'out_for_delivery'
    }
    toast.success('Delivery person assigned')
    setAssignTarget(null)
    setRiderId('')
  }

  return (
    <PageShell title={t('orders.title')} subtitle={t('orders.subtitle')}>
      <Card className="overflow-hidden">
        <TableToolbar
          search={q}
          onSearchChange={setQ}
          searchPlaceholder="Search ID or customer…"
          resultCount={filtered.length}
          filters={
            <>
              <FilterSelect
                label="Status"
                value={status}
                onChange={setStatus}
                options={[
                  { value: 'all', label: 'All statuses' },
                  { value: 'confirmed', label: 'Confirmed' },
                  { value: 'picking', label: 'Picking' },
                  { value: 'out_for_delivery', label: 'Out for delivery' },
                  { value: 'cancelled', label: 'Cancelled' },
                ]}
              />
              <FilterSelect
                label="Fulfillment"
                value={fulfillment}
                onChange={setFulfillment}
                options={[
                  { value: 'all', label: 'All types' },
                  { value: 'delivery', label: 'Delivery' },
                  { value: 'pickup', label: 'Pickup' },
                ]}
              />
              {canPickBranch ? (
                <FilterSelect
                  label="Branch"
                  value={branchFilter}
                  onChange={setBranchFilter}
                  options={[
                    { value: 'all', label: t('common.allBranches') },
                    ...branches.map((b) => ({ value: b.id, label: b.name })),
                  ]}
                />
              ) : null}
              <FilterSelect
                label="Channel"
                value={channel}
                onChange={setChannel}
                options={[
                  { value: 'all', label: 'All channels' },
                  { value: 'web', label: 'Web' },
                  { value: 'mobile', label: 'Mobile' },
                  { value: 'telegram', label: 'Telegram' },
                  { value: 'b2b', label: 'B2B' },
                ]}
              />
              <ClearFiltersButton
                visible={filtersActive}
                onClick={() => {
                  setQ('')
                  setStatus('all')
                  setFulfillment('all')
                  setBranchFilter('all')
                  setChannel('all')
                }}
              />
            </>
          }
          actions={
            <Button asChild className="h-10 gap-2 shadow-none">
              <Link to="/orders/new">
                <Plus className="h-4 w-4" />
                New order
              </Link>
            </Button>
          }
        />
        <CardContent className="p-0">
          <Table>
            <TableHeader>
              <TableRow className="hover:bg-transparent">
                <TableHead>ID</TableHead>
                <TableHead>Customer</TableHead>
                <TableHead>{t('common.branch')}</TableHead>
                <TableHead>Fulfillment</TableHead>
                <TableHead>{t('common.status')}</TableHead>
                <TableHead>Total</TableHead>
                <TableHead className="text-right">{t('common.actions')}</TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {filtered.length === 0 ? (
                <TableRow>
                  <TableCell colSpan={7} className="h-24 text-center text-muted-foreground">
                    {t('common.noResults')}
                  </TableCell>
                </TableRow>
              ) : (
                filtered.map((o) => (
                  <TableRow key={o.id}>
                    <TableCell className="font-medium">{o.id}</TableCell>
                    <TableCell>{o.customerName}</TableCell>
                    <TableCell>{branches.find((b) => b.id === o.branchId)?.name}</TableCell>
                    <TableCell>
                      <Badge variant="outline">{o.fulfillment}</Badge>
                    </TableCell>
                    <TableCell>
                      <Badge
                        variant={
                          o.status === 'cancelled'
                            ? 'danger'
                            : o.status === 'out_for_delivery'
                              ? 'warning'
                              : 'success'
                        }
                      >
                        {o.status}
                      </Badge>
                    </TableCell>
                    <TableCell>{formatEtb(o.totalEtb)}</TableCell>
                    <TableCell>
                      <RowActions
                        primary={[
                          {
                            label: 'Confirm',
                            icon: <CheckCircle2 className="h-3.5 w-3.5" />,
                            onClick: () => confirm(o.id),
                            disabled: o.status === 'confirmed' || o.status === 'cancelled',
                          },
                        ]}
                        items={[
                          ...(o.fulfillment === 'delivery'
                            ? [
                                {
                                  label: t('orders.assignRider'),
                                  icon: <Truck className="h-3.5 w-3.5" />,
                                  onClick: () => {
                                    setAssignTarget(o)
                                    setRiderId(o.assignedRiderId ?? '')
                                  },
                                },
                              ]
                            : []),
                          {
                            label: 'Cancel',
                            icon: <XCircle className="h-3.5 w-3.5" />,
                            variant: 'destructive' as const,
                            onClick: () => cancel(o.id),
                            disabled: o.status === 'cancelled',
                          },
                        ]}
                      />
                    </TableCell>
                  </TableRow>
                ))
              )}
            </TableBody>
          </Table>
        </CardContent>
      </Card>

      <Dialog open={!!assignTarget} onOpenChange={(open) => !open && setAssignTarget(null)}>
        <DialogContent>
          <DialogHeader>
            <DialogTitle>{t('orders.assignRider')}</DialogTitle>
            <DialogDescription>
              {assignTarget?.id} · {assignTarget?.customerName}
            </DialogDescription>
          </DialogHeader>
          <div className="space-y-3">
            <div className="space-y-1.5">
              <Label>Delivery person</Label>
              <SelectNative value={riderId} onChange={(e) => setRiderId(e.target.value)}>
                <option value="">Select rider…</option>
                {riders.map((r) => (
                  <option key={r.id} value={r.id}>
                    {r.name} · {r.zone}
                  </option>
                ))}
              </SelectNative>
            </div>
            <div className="flex justify-end gap-2">
              <Button variant="outline" onClick={() => setAssignTarget(null)}>
                {t('common.cancel')}
              </Button>
              <Button disabled={!riderId} onClick={saveAssign}>
                {t('common.assign')}
              </Button>
            </div>
          </div>
        </DialogContent>
      </Dialog>
    </PageShell>
  )
}