"use client";

import { zodResolver } from "@hookform/resolvers/zod";
import { FileText, Loader2, X } from "lucide-react";
import { useEffect, useState } from "react";
import { createPortal } from "react-dom";
import { useForm } from "react-hook-form";
import { Button } from "@/components/ui/button";
import { Card } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Contract, CreateContractDTO } from "@/types/contract";
import { Customer } from "@/types/customer";
import { contractSchema, ContractFormValues } from "@/validators/contract";

interface ContractFormModalProps {
  isOpen: boolean;
  onClose: () => void;
  onSubmit: (data: CreateContractDTO) => Promise<void>;
  contractToEdit?: Contract | null;
  customers: Customer[];
  isSaving?: boolean;
}

export function ContractFormModal({
  isOpen,
  onClose,
  onSubmit,
  contractToEdit,
  customers,
  isSaving = false,
}: ContractFormModalProps) {
  const today = new Date().toISOString().split("T")[0];
  const in30Days = new Date(Date.now() + 30 * 24 * 60 * 60 * 1000)
    .toISOString()
    .split("T")[0];

  const {
    register,
    handleSubmit,
    reset,
    formState: { errors },
  } = useForm<ContractFormValues>({
    resolver: zodResolver(contractSchema),
    defaultValues: {
      customerId: "",
      title: "",
      startDate: today,
      endDate: in30Days,
      value: 15000,
      clauses: "",
      notes: "",
      status: "DRAFT",
    },
  });

  useEffect(() => {
    if (contractToEdit) {
      reset({
        customerId: contractToEdit.customerId,
        title: contractToEdit.title,
        startDate: contractToEdit.startDate.split("T")[0],
        endDate: contractToEdit.endDate.split("T")[0],
        value: Number(contractToEdit.value) || 0,
        clauses: contractToEdit.clauses || "",
        notes: contractToEdit.notes || "",
        status: contractToEdit.status,
      });
    } else {
      const activeCustomers = customers.filter((c) => c.status === "ACTIVE");
      reset({
        customerId: activeCustomers[0]?.id || customers[0]?.id || "",
        title: "Contrato de Locação de Máquinas e Equipamentos",
        startDate: today,
        endDate: in30Days,
        value: 15000,
        clauses: "",
        notes: "",
        status: "DRAFT",
      });
    }
  }, [contractToEdit, customers, reset, isOpen, today, in30Days]);

  const activeCustomers = customers.filter((c) => c.status === "ACTIVE" || c.id === contractToEdit?.customerId);

  const onFormSubmit = async (values: ContractFormValues) => {
    await onSubmit(values as CreateContractDTO);
    onClose();
  };

  const [mounted, setMounted] = useState(false);

  useEffect(() => {
    setMounted(true);
  }, []);

  if (!isOpen || !mounted) return null;

  return createPortal(
    <div className="fixed inset-0 z-[9999] flex items-center justify-center bg-black/60 p-4 backdrop-blur-xs transition-all">
      <Card className="w-full max-w-3xl max-h-[90vh] flex flex-col shadow-2xl overflow-hidden p-0">
        {/* Header Fixo no Topo */}
        <div className="flex items-center justify-between border-b px-6 py-4 bg-background shrink-0">
          <div>
            <h2 className="text-xl font-bold flex items-center gap-2">
              <FileText className="h-5 w-5 text-primary" />
              {contractToEdit ? "Editar Minuta de Contrato" : "Elaborar Novo Contrato"}
            </h2>
            <p className="text-sm text-muted-foreground">
              {contractToEdit
                ? `Altere as cláusulas e condições do contrato ${contractToEdit.code}.`
                : "Defina o cliente, título, vigência e termos do contrato formal."}
            </p>
          </div>
          <Button variant="ghost" size="icon" onClick={onClose}>
            <X className="h-5 w-5" />
          </Button>
        </div>

        <form onSubmit={handleSubmit(onFormSubmit)} className="flex-1 flex flex-col overflow-hidden min-h-0">
          {/* Corpo Rolável */}
          <div className="flex-1 overflow-y-auto px-6 py-5 space-y-5">
          <div className="grid gap-4 md:grid-cols-2">
            <div>
              <label className="mb-1 block text-sm font-medium">Cliente *</label>
              <select
                {...register("customerId")}
                className="w-full rounded-md border border-input bg-background px-3 py-2 text-sm shadow-xs focus:outline-hidden focus:ring-1 focus:ring-ring"
              >
                <option value="">Selecione o cliente...</option>
                {activeCustomers.map((c) => (
                  <option key={c.id} value={c.id}>
                    {c.name} ({c.document})
                  </option>
                ))}
              </select>
              {errors.customerId && (
                <p className="mt-1 text-xs text-rose-500">{errors.customerId.message}</p>
              )}
            </div>

            <div>
              <label className="mb-1 block text-sm font-medium">Status do Contrato</label>
              <select
                {...register("status")}
                className="w-full rounded-md border border-input bg-background px-3 py-2 text-sm shadow-xs focus:outline-hidden focus:ring-1 focus:ring-ring"
              >
                <option value="DRAFT">Rascunho (Minuta)</option>
                <option value="PENDING_SIGNATURE">Aguardando Assinatura</option>
                <option value="SIGNED">Assinado & Vigente</option>
                <option value="EXPIRED">Expirado</option>
                <option value="TERMINATED">Encerrado / Distrato</option>
              </select>
            </div>
          </div>

          <div>
            <label className="mb-1 block text-sm font-medium">Título do Contrato *</label>
            <Input {...register("title")} placeholder="Ex: Contrato de Locação Industrial Obra X" />
            {errors.title && (
              <p className="mt-1 text-xs text-rose-500">{errors.title.message}</p>
            )}
          </div>

          <div className="grid gap-4 md:grid-cols-3">
            <div>
              <label className="mb-1 block text-sm font-medium">Data Inicial *</label>
              <Input type="date" {...register("startDate")} />
              {errors.startDate && (
                <p className="mt-1 text-xs text-rose-500">{errors.startDate.message}</p>
              )}
            </div>

            <div>
              <label className="mb-1 block text-sm font-medium">Data Final *</label>
              <Input type="date" {...register("endDate")} />
              {errors.endDate && (
                <p className="mt-1 text-xs text-rose-500">{errors.endDate.message}</p>
              )}
            </div>

            <div>
              <label className="mb-1 block text-sm font-medium">Valor Contratado (R$) *</label>
              <Input
                type="number"
                step="any"
                {...register("value", { valueAsNumber: true })}
                placeholder="15000.00"
              />
              {errors.value && (
                <p className="mt-1 text-xs text-rose-500">{errors.value.message}</p>
              )}
            </div>
          </div>

          <div>
            <label className="mb-1 block text-sm font-medium">Cláusulas Personalizadas e Condições</label>
            <textarea
              {...register("clauses")}
              rows={4}
              className="w-full rounded-md border border-input bg-background p-3 text-xs font-mono shadow-xs focus:outline-hidden focus:ring-1 focus:ring-ring"
              placeholder="Digite as cláusulas contratuais adicionais..."
            />
          </div>

          <div>
            <label className="mb-1 block text-sm font-medium">Observações Internas</label>
            <textarea
              {...register("notes")}
              rows={2}
              className="w-full rounded-md border border-input bg-background p-3 text-sm shadow-xs focus:outline-hidden focus:ring-1 focus:ring-ring"
              placeholder="Notas para a equipe interna ou informações de assinatura..."
            />
          </div>

          </div>

          {/* Rodapé e Botões (Fixo) */}
          <div className="flex items-center justify-end gap-3 border-t px-6 py-4 bg-background shrink-0">
            <Button type="button" variant="secondary" onClick={onClose}>
              Cancelar
            </Button>
            <Button type="submit" disabled={isSaving}>
              {isSaving && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
              {contractToEdit ? "Salvar Contrato" : "Gerar Minuta de Contrato"}
            </Button>
          </div>
        </form>
      </Card>
    </div>,
    document.body
  );
}