import { useState } from 'react';
import {
  Alert,
  App,
  Button,
  Card,
  Col,
  Form,
  Input,
  InputNumber,
  Row,
  Segmented,
  Select,
  Spin,
  Switch,
  Typography,
} from 'antd';
import {
  ArrowLeftOutlined,
  BankOutlined,
  CheckCircleOutlined,
  EnvironmentOutlined,
  PhoneOutlined,
  ShopOutlined,
  UserOutlined,
} from '@ant-design/icons';
import { useNavigate } from '@tanstack/react-router';
import type { CreateClientNovo } from '@sar/api-interface';
import { useMunicipios, usePautas, useFormasPagamento } from '../../lib/queries/catalog';
import { useCreateClientNovo } from '../../lib/queries/clients';

const { Title, Text } = Typography;

type Pessoa = 'PJ' | 'PF';

function Section({
  icon,
  title,
  children,
}: {
  icon: React.ReactNode;
  title: string;
  children: React.ReactNode;
}) {
  return (
    <div style={{ marginBottom: 24 }}>
      <div
        style={{
          display: 'flex',
          alignItems: 'center',
          gap: 8,
          marginBottom: 16,
          paddingBottom: 8,
          borderBottom: '1px solid #EBF0F5',
        }}
      >
        <span style={{ color: '#003B8E', fontSize: 16 }}>{icon}</span>
        <Text strong style={{ fontSize: 14, color: '#003B8E' }}>
          {title}
        </Text>
      </div>
      {children}
    </div>
  );
}

export function NewClientPage() {
  const navigate = useNavigate();
  const { message } = App.useApp();
  const [form] = Form.useForm();
  const [pessoa, setPessoa] = useState<Pessoa>('PJ');
  const [municipioSearch, setMunicipioSearch] = useState('');
  const [syncError, setSyncError] = useState<string | null>(null);

  const { data: municipios = [], isFetching: loadingMun } = useMunicipios(
    municipioSearch || undefined,
  );
  const { data: pautas = [] } = usePautas();
  const { data: formas = [] } = useFormasPagamento();
  const createMutation = useCreateClientNovo();

  async function handleCepBlur(cep: string) {
    const digits = cep.replace(/\D/g, '');
    if (digits.length !== 8) return;
    try {
      const res = await fetch(`https://viacep.com.br/ws/${digits}/json/`);
      const data = (await res.json()) as {
        erro?: boolean;
        logradouro?: string;
        bairro?: string;
        localidade?: string;
        uf?: string;
      };
      if (data.erro) return;
      if (data.logradouro) form.setFieldValue('endereco', data.logradouro);
      if (data.bairro) form.setFieldValue('bairro', data.bairro);
      if (data.localidade && data.uf) {
        setMunicipioSearch(data.localidade);
      }
    } catch {
      // silencioso — CEP inválido não bloqueia
    }
  }

  async function onFinish(values: Record<string, unknown>) {
    setSyncError(null);

    const payload: CreateClientNovo = {
      pesso: pessoa === 'PJ' ? 0 : 1,
      consfinal: values.consfinal ? 1 : 0,
      nome: String(values.nome ?? '').slice(0, 40),
      razao: String(values.razao ?? values.nome ?? '').slice(0, 65),
      cgcpf: values.cgcpf ? String(values.cgcpf) : undefined,
      sufCgcpf: '',
      inscr: values.inscr ? String(values.inscr) : '',
      indicadorIe: values.indicadorIe as 1 | 2 | 9 | undefined,
      endereco: String(values.endereco ?? '').slice(0, 60),
      numEndereco: String(values.numEndereco ?? '').slice(0, 10),
      bairro: String(values.bairro ?? '').slice(0, 60),
      idMunicipio: Number(values.idMunicipio),
      cep: String(values.cep ?? '')
        .replace(/\D/g, '')
        .slice(0, 9),
      ddd: String(values.ddd ?? '').slice(0, 4),
      telefone: String(values.telefone ?? '').slice(0, 35),
      email: String(values.email ?? '').slice(0, 80),
      limiteCredito: Number(values.limiteCredito ?? 0),
      codFormapag: values.codFormapag ? Number(values.codFormapag) : undefined,
      codPauta: values.codPauta ? Number(values.codPauta) : undefined,
    };

    let result: Awaited<ReturnType<typeof createMutation.mutateAsync>>;
    try {
      result = await createMutation.mutateAsync(payload);
    } catch {
      return; // erro já notificado pelo handler global do QueryClient
    }

    if (!result.sincronizado && result.erroSync) {
      setSyncError(result.erroSync);
      void message.warning('Cliente cadastrado, mas houve erro na sincronização com o ERP.');
    } else {
      void message.success(
        `Cliente cadastrado com sucesso! Código ERP: ${result.idCorrentErp ?? '—'}`,
      );
      void navigate({ to: '/clientes' });
    }
  }

  const isPJ = pessoa === 'PJ';

  return (
    <div style={{ maxWidth: 860, margin: '0 auto', padding: '24px 16px' }}>
      {/* Cabeçalho */}
      <div style={{ display: 'flex', alignItems: 'center', gap: 16, marginBottom: 24 }}>
        <Button
          icon={<ArrowLeftOutlined />}
          onClick={() => void navigate({ to: '/clientes' })}
          style={{ borderRadius: 8 }}
        >
          Voltar
        </Button>
        <div>
          <Title level={3} style={{ margin: 0, color: '#003B8E' }}>
            Cadastrar Cliente
          </Title>
          <Text type="secondary" style={{ fontSize: 13 }}>
            Após salvar, o cliente é criado automaticamente no ERP.
          </Text>
        </div>
      </div>

      {/* Seletor PJ / PF */}
      <div style={{ marginBottom: 24 }}>
        <Segmented
          size="large"
          value={pessoa}
          onChange={(v) => {
            setPessoa(v as Pessoa);
            form.resetFields(['cgcpf', 'inscr', 'indicadorIe', 'consfinal', 'razao']);
          }}
          options={[
            { value: 'PJ', icon: <BankOutlined />, label: 'CNPJ — Pessoa Jurídica' },
            { value: 'PF', icon: <UserOutlined />, label: 'CPF — Pessoa Física' },
          ]}
          style={{ borderRadius: 10 }}
        />
      </div>

      <Form
        form={form}
        layout="vertical"
        onFinish={(v) => void onFinish(v as Record<string, unknown>)}
        requiredMark="optional"
        initialValues={{ consfinal: false, limiteCredito: 0 }}
      >
        <Card
          style={{ borderRadius: 12, border: '1px solid #EBF0F5', marginBottom: 16 }}
          styles={{ body: { padding: '20px 24px' } }}
        >
          {/* ── Identificação ─────────────────────────────────────────── */}
          <Section icon={isPJ ? <ShopOutlined /> : <UserOutlined />} title="Identificação">
            <Row gutter={[16, 0]}>
              {isPJ ? (
                <>
                  <Col xs={24} md={12}>
                    <Form.Item
                      name="razao"
                      label="Razão Social"
                      rules={[{ required: true, message: 'Informe a razão social' }]}
                    >
                      <Input placeholder="Razão Social Ltda" maxLength={65} />
                    </Form.Item>
                  </Col>
                  <Col xs={24} md={12}>
                    <Form.Item
                      name="nome"
                      label="Nome Fantasia"
                      rules={[{ required: true, message: 'Informe o nome fantasia' }]}
                    >
                      <Input placeholder="Nome fantasia" maxLength={40} />
                    </Form.Item>
                  </Col>
                  <Col xs={24} md={8}>
                    <Form.Item name="cgcpf" label="CNPJ">
                      <Input placeholder="00.000.000/0000-00" maxLength={18} />
                    </Form.Item>
                  </Col>
                  <Col xs={24} md={8}>
                    <Form.Item name="inscr" label="Inscrição Estadual">
                      <Input placeholder="000.000.000" maxLength={18} />
                    </Form.Item>
                  </Col>
                  <Col xs={24} md={8}>
                    <Form.Item name="indicadorIe" label="Indicador IE">
                      <Select placeholder="Selecione" allowClear>
                        <Select.Option value={1}>Contribuinte</Select.Option>
                        <Select.Option value={2}>Isento</Select.Option>
                        <Select.Option value={9}>Não contribuinte</Select.Option>
                      </Select>
                    </Form.Item>
                  </Col>
                  <Col xs={24} md={8}>
                    <Form.Item name="consfinal" label="Consumidor Final" valuePropName="checked">
                      <Switch />
                    </Form.Item>
                  </Col>
                </>
              ) : (
                <>
                  <Col xs={24} md={16}>
                    <Form.Item
                      name="nome"
                      label="Nome Completo"
                      rules={[{ required: true, message: 'Informe o nome' }]}
                    >
                      <Input placeholder="Nome completo" maxLength={40} />
                    </Form.Item>
                  </Col>
                  <Col xs={24} md={8}>
                    <Form.Item name="cgcpf" label="CPF">
                      <Input placeholder="000.000.000-00" maxLength={14} />
                    </Form.Item>
                  </Col>
                </>
              )}
            </Row>
          </Section>

          {/* ── Endereço ──────────────────────────────────────────────── */}
          <Section icon={<EnvironmentOutlined />} title="Endereço">
            <Row gutter={[16, 0]}>
              <Col xs={24} md={6}>
                <Form.Item name="cep" label="CEP">
                  <Input
                    placeholder="00000-000"
                    maxLength={9}
                    onBlur={(e) => void handleCepBlur(e.target.value)}
                  />
                </Form.Item>
              </Col>
              <Col xs={24} md={14}>
                <Form.Item name="endereco" label="Endereço">
                  <Input placeholder="Rua / Av." maxLength={60} />
                </Form.Item>
              </Col>
              <Col xs={24} md={4}>
                <Form.Item name="numEndereco" label="Número">
                  <Input placeholder="123" maxLength={10} />
                </Form.Item>
              </Col>
              <Col xs={24} md={10}>
                <Form.Item name="bairro" label="Bairro">
                  <Input placeholder="Bairro" maxLength={60} />
                </Form.Item>
              </Col>
              <Col xs={24} md={14}>
                <Form.Item
                  name="idMunicipio"
                  label="Município"
                  rules={[{ required: true, message: 'Selecione o município' }]}
                >
                  <Select
                    showSearch
                    placeholder="Digite para buscar..."
                    filterOption={false}
                    onSearch={setMunicipioSearch}
                    notFoundContent={loadingMun ? <Spin size="small" /> : 'Nenhum resultado'}
                    optionLabelProp="label"
                  >
                    {municipios.map((m) => (
                      <Select.Option
                        key={m.idMunicipio}
                        value={m.idMunicipio}
                        label={`${m.nome} — ${m.uf}`}
                      >
                        {m.nome}{' '}
                        <Text type="secondary" style={{ fontSize: 12 }}>
                          {m.uf}
                        </Text>
                      </Select.Option>
                    ))}
                  </Select>
                </Form.Item>
              </Col>
            </Row>
          </Section>

          {/* ── Contato ───────────────────────────────────────────────── */}
          <Section icon={<PhoneOutlined />} title="Contato">
            <Row gutter={[16, 0]}>
              <Col xs={8} md={4}>
                <Form.Item name="ddd" label="DDD">
                  <Input placeholder="48" maxLength={4} />
                </Form.Item>
              </Col>
              <Col xs={16} md={8}>
                <Form.Item name="telefone" label="Telefone">
                  <Input placeholder="99999-9999" maxLength={35} />
                </Form.Item>
              </Col>
              <Col xs={24} md={12}>
                <Form.Item name="email" label="E-mail">
                  <Input placeholder="contato@empresa.com.br" maxLength={80} type="email" />
                </Form.Item>
              </Col>
            </Row>
          </Section>

          {/* ── Comercial ─────────────────────────────────────────────── */}
          <Section icon={<BankOutlined />} title="Comercial">
            <Row gutter={[16, 0]}>
              <Col xs={24} md={8}>
                <Form.Item name="codFormapag" label="Forma de Pagamento">
                  <Select placeholder="Selecione" allowClear>
                    {formas.map((f) => (
                      <Select.Option key={f.codigo} value={f.codigo}>
                        {f.descricao}
                      </Select.Option>
                    ))}
                  </Select>
                </Form.Item>
              </Col>
              <Col xs={24} md={8}>
                <Form.Item name="codPauta" label="Tabela de Preços">
                  <Select placeholder="Selecione" allowClear>
                    {pautas.map((p) => (
                      <Select.Option key={p.idPauta} value={p.idPauta}>
                        {p.descricao}
                      </Select.Option>
                    ))}
                  </Select>
                </Form.Item>
              </Col>
              <Col xs={24} md={8}>
                <Form.Item name="limiteCredito" label="Limite de Crédito">
                  <InputNumber
                    style={{ width: '100%' }}
                    min={0}
                    step={100}
                    formatter={(v) => `R$ ${v ?? 0}`.replace(/\B(?=(\d{3})+(?!\d))/g, '.')}
                    parser={(v) => Number((v ?? '').replace(/R\$\s?\.*/g, '').replace(',', '.'))}
                    placeholder="0,00"
                  />
                </Form.Item>
              </Col>
            </Row>
          </Section>

          {syncError && (
            <Alert
              type="warning"
              showIcon
              message="Falha na sincronização com o ERP"
              description={syncError}
              style={{ marginBottom: 16 }}
            />
          )}
        </Card>

        {/* Rodapé sticky */}
        <div
          style={{
            position: 'sticky',
            bottom: 0,
            background: '#fff',
            borderTop: '1px solid #EBF0F5',
            padding: '12px 24px',
            display: 'flex',
            justifyContent: 'flex-end',
            gap: 12,
            borderRadius: '0 0 12px 12px',
          }}
        >
          <Button
            onClick={() => void navigate({ to: '/clientes' })}
            style={{ borderRadius: 8 }}
            disabled={createMutation.isPending}
          >
            Cancelar
          </Button>
          <Button
            type="primary"
            htmlType="submit"
            icon={<CheckCircleOutlined />}
            loading={createMutation.isPending}
            style={{ borderRadius: 8, fontWeight: 600, minWidth: 160 }}
          >
            {createMutation.isPending ? 'Cadastrando...' : 'Cadastrar Cliente'}
          </Button>
        </div>
      </Form>
    </div>
  );
}