'use client';

import * as React from 'react';
import { useParams } from 'next/navigation';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { Package, ShoppingCart, Users } from 'lucide-react';

import { getTenant, updateTenant, type TenantDetail } from '@/lib/api/tenants';
import { listPlanos } from '@/lib/api/planos';
import { marcarFaturaPaga } from '@/lib/api/faturas';
import type { Fatura } from '@/lib/api/faturas';
import { updateTenantSchema, type UpdateTenantFormValues } from '@/lib/validators/tenants';
import { ApiError } from '@/lib/api/client';
import { formatCurrency, formatDate } from '@/lib/format';
import { toast } from '@/lib/toast';

import { Badge } from '@/components/ui/badge';
import { Button } from '@/components/ui/button';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { DataTable, type DataTableColumn } from '@/components/ui/data-table';
import { FormField } from '@/components/ui/form-field';
import { Input } from '@/components/ui/input';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
import { Skeleton } from '@/components/ui/skeleton';
import { StatusPill } from '@/components/ui/status-pill';
import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
import { StatCard } from '@/components/domain/stat-card';
import { TenantStatusDialog } from '@/components/domain/tenant-status-dialog';

export default function TenantDetailPage() {
  const params = useParams<{ id: string }>();
  const tenantId = params.id;
  const queryClient = useQueryClient();
  const [statusDialogOpen, setStatusDialogOpen] = React.useState(false);

  const { data: tenant, isLoading } = useQuery({
    queryKey: ['master', 'tenants', tenantId],
    queryFn: () => getTenant(tenantId),
  });

  if (isLoading || !tenant) {
    return (
      <div className="flex flex-col gap-4">
        <Skeleton className="h-8 w-64" />
        <Skeleton className="h-64 w-full" />
      </div>
    );
  }

  return (
    <div className="flex flex-col gap-6">
      <div className="flex flex-wrap items-center justify-between gap-4">
        <div>
          <div className="flex items-center gap-3">
            <h1 className="text-xl font-semibold text-foreground">
              {tenant.nome_fantasia || tenant.razao_social}
            </h1>
            <StatusPill status={tenant.status} />
          </div>
          <p className="text-sm text-muted-foreground">{tenant.email_contato}</p>
        </div>
        <Button variant="outline" onClick={() => setStatusDialogOpen(true)}>
          Mudar status
        </Button>
      </div>

      <Tabs defaultValue="dados">
        <TabsList>
          <TabsTrigger value="dados">Dados cadastrais</TabsTrigger>
          <TabsTrigger value="faturas">Faturas</TabsTrigger>
          <TabsTrigger value="uso">Uso</TabsTrigger>
        </TabsList>

        <TabsContent value="dados" className="pt-4">
          <DadosCadastraisForm tenantId={tenantId} tenant={tenant} />
        </TabsContent>

        <TabsContent value="faturas" className="pt-4">
          <FaturasTab faturas={tenant.faturas} tenantId={tenantId} />
        </TabsContent>

        <TabsContent value="uso" className="pt-4">
          <div className="grid grid-cols-1 gap-4 sm:grid-cols-3">
            <StatCard label="Usuários" value={String(tenant._count.usuarios)} icon={Users} />
            <StatCard
              label="Clientes"
              value={`${tenant._count.customers}${tenant.plano.limite_customers ? ` / ${tenant.plano.limite_customers}` : ''}`}
              icon={Package}
            />
            <StatCard label="Vendas" value={String(tenant._count.vendas)} icon={ShoppingCart} />
          </div>
        </TabsContent>
      </Tabs>

      <TenantStatusDialog
        tenant={statusDialogOpen ? { id: tenant.id, razao_social: tenant.razao_social, status: tenant.status } : null}
        onOpenChange={setStatusDialogOpen}
        onSuccess={() => queryClient.invalidateQueries({ queryKey: ['master', 'tenants', tenantId] })}
      />
    </div>
  );
}

function DadosCadastraisForm({ tenantId, tenant }: { tenantId: string; tenant: TenantDetail }) {
  const queryClient = useQueryClient();
  const { data: planos } = useQuery({
    queryKey: ['master', 'planos', { ativo: true }],
    queryFn: () => listPlanos({ ativo: true }),
  });

  const form = useForm<UpdateTenantFormValues>({
    resolver: zodResolver(updateTenantSchema),
    defaultValues: {
      razao_social: tenant.razao_social,
      nome_fantasia: tenant.nome_fantasia ?? '',
      documento: tenant.documento ?? '',
      email_contato: tenant.email_contato,
      telefone: tenant.telefone ?? '',
      plano_id: tenant.plano_id,
      dia_vencimento_mensalidade: tenant.dia_vencimento_mensalidade,
    },
  });

  const mutation = useMutation({
    mutationFn: (values: UpdateTenantFormValues) =>
      updateTenant(tenantId, {
        ...values,
        nome_fantasia: values.nome_fantasia || undefined,
        documento: values.documento || undefined,
        telefone: values.telefone || undefined,
      }),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['master', 'tenants', tenantId] });
      queryClient.invalidateQueries({ queryKey: ['master', 'tenants'] });
      toast.success('Dados do tenant atualizados.');
    },
    onError: (err) => {
      toast.error(err instanceof ApiError ? err.message : 'Não foi possível salvar as alterações.');
    },
  });

  return (
    <Card className="max-w-2xl">
      <CardHeader>
        <CardTitle>Dados cadastrais</CardTitle>
      </CardHeader>
      <CardContent>
        <form
          className="flex flex-col gap-4"
          onSubmit={form.handleSubmit((values) => mutation.mutate(values))}
        >
          <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
            <FormField label="Razão social" error={form.formState.errors.razao_social?.message} required>
              <Input {...form.register('razao_social')} />
            </FormField>
            <FormField label="Nome fantasia" error={form.formState.errors.nome_fantasia?.message}>
              <Input {...form.register('nome_fantasia')} />
            </FormField>
          </div>
          <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
            <FormField label="Documento" error={form.formState.errors.documento?.message}>
              <Input {...form.register('documento')} />
            </FormField>
            <FormField label="Telefone" error={form.formState.errors.telefone?.message}>
              <Input {...form.register('telefone')} />
            </FormField>
          </div>
          <FormField label="E-mail de contato" error={form.formState.errors.email_contato?.message} required>
            <Input type="email" {...form.register('email_contato')} />
          </FormField>
          <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
            <FormField
              label="Plano"
              id="plano_id"
              error={form.formState.errors.plano_id?.message}
              required
            >
              <Select
                value={form.watch('plano_id')}
                onValueChange={(value) => form.setValue('plano_id', value, { shouldValidate: true })}
              >
                <SelectTrigger id="plano_id" className="w-full">
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  {(planos ?? []).map((plano) => (
                    <SelectItem key={plano.id} value={plano.id}>
                      {plano.nome}
                    </SelectItem>
                  ))}
                  {!planos?.some((p) => p.id === tenant.plano_id) && (
                    <SelectItem value={tenant.plano_id}>{tenant.plano.nome} (inativo)</SelectItem>
                  )}
                </SelectContent>
              </Select>
            </FormField>
            <FormField
              label="Dia de vencimento da mensalidade"
              error={form.formState.errors.dia_vencimento_mensalidade?.message}
            >
              <Input
                type="number"
                min="1"
                max="28"
                {...form.register('dia_vencimento_mensalidade', {
                  setValueAs: (v) => (v === '' ? undefined : Number(v)),
                })}
              />
            </FormField>
          </div>
          <div>
            <Button type="submit" loading={mutation.isPending}>
              Salvar alterações
            </Button>
          </div>
        </form>
      </CardContent>
    </Card>
  );
}

function FaturasTab({ faturas, tenantId }: { faturas: Fatura[]; tenantId: string }) {
  const queryClient = useQueryClient();

  const marcarPagoMutation = useMutation({
    mutationFn: (id: string) => marcarFaturaPaga(id),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['master', 'tenants', tenantId] });
      toast.success('Fatura marcada como paga.');
    },
    onError: (err) => {
      toast.error(err instanceof ApiError ? err.message : 'Não foi possível marcar a fatura como paga.');
    },
  });

  const columns: DataTableColumn<Fatura>[] = [
    { id: 'referencia', header: 'Referência', primary: true, cell: (row) => row.referencia },
    { id: 'valor', header: 'Valor', cell: (row) => formatCurrency(row.valor) },
    { id: 'vencimento', header: 'Vencimento', cell: (row) => formatDate(row.vencimento) },
    { id: 'status', header: 'Status', primary: true, cell: (row) => <StatusPill status={row.status} /> },
    { id: 'pago_em', header: 'Pago em', cell: (row) => formatDate(row.pago_em) },
  ];

  return (
    <div className="flex flex-col gap-3">
      <p className="text-sm text-muted-foreground">Últimas 5 faturas deste tenant.</p>
      <DataTable
        columns={columns}
        data={faturas}
        keyField={(row) => row.id}
        emptyTitle="Nenhuma fatura gerada ainda"
        rowActions={(row) =>
          row.status !== 'pago' ? (
            <Button
              variant="ghost"
              size="sm"
              loading={marcarPagoMutation.isPending && marcarPagoMutation.variables === row.id}
              onClick={() => marcarPagoMutation.mutate(row.id)}
            >
              Marcar como paga
            </Button>
          ) : (
            <Badge variant="outline">Paga</Badge>
          )
        }
      />
    </div>
  );
}