"use client";

import { useState, useEffect, useRef, useCallback } from "react";
import Link from "next/link";
import { Button } from "@/components/ui/button";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Plus, Edit, Trash2, Eye, Calendar, Filter } from "lucide-react";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from "@/components/ui/alert-dialog";
import SecretaryLayout from "@/components/secretary-layout";
import { patientsService } from "@/services/patientsApi.mjs";

// --- INÍCIO DA CORREÇÃO ---
interface Patient {
  id: string;
  nome: string;
  telefone: string;
  cidade: string;
  estado: string;
  ultimoAtendimento: string;
  proximoAtendimento: string;
  vip: boolean;
  convenio: string;
  status?: string;
  // Propriedades detalhadas para o modal
  full_name?: string;
  cpf?: string;
  email?: string;
  phone_mobile?: string;
  phone1?: string;
  phone2?: string;
  social_name?: string;
  sex?: string;
  blood_type?: string;
  weight_kg?: number;
  height_m?: number;
  bmi?: number;
  street?: string;
  neighborhood?: string;
  city?: string; // <-- Adicionado
  state?: string; // <-- Adicionado
  cep?: string;
  created_at?: string;
  updated_at?: string;
}
// --- FIM DA CORREÇÃO ---

// Função para formatar a data
const formatDate = (dateString: string | null | undefined): string => {
  if (!dateString) {
    return "N/A";
  }
  try {
    const date = new Date(dateString);
    if (isNaN(date.getTime())) {
      return "Data inválida";
    }
    const day = String(date.getDate()).padStart(2, '0');
    const month = String(date.getMonth() + 1).padStart(2, '0');
    const year = date.getFullYear();
    const hours = String(date.getHours()).padStart(2, '0');
    const minutes = String(date.getMinutes()).padStart(2, '0');
    return `${day}/${month}/${year} ${hours}:${minutes}`;
  } catch (error) {
    return "Data inválida";
  }
};

export default function PacientesPage() {
  const [searchTerm, setSearchTerm] = useState("");
  const [convenioFilter, setConvenioFilter] = useState("all");
  const [vipFilter, setVipFilter] = useState("all");
  const [patients, setPatients] = useState<Patient[]>([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [page, setPage] = useState(1);
  const [hasNext, setHasNext] = useState(true);
  const [isFetching, setIsFetching] = useState(false);
  const observerRef = useRef<HTMLDivElement | null>(null);
  const [deleteDialogOpen, setDeleteDialogOpen] = useState(false);
  const [patientToDelete, setPatientToDelete] = useState<string | null>(null);
  const [detailsDialogOpen, setDetailsDialogOpen] = useState(false);
  const [patientDetails, setPatientDetails] = useState<Patient | { error: string } | null>(null);

  const openDetailsDialog = async (patientId: string) => {
    setDetailsDialogOpen(true);
    setPatientDetails(null);
    try {
      const res = await patientsService.getById(patientId);
      setPatientDetails(res[0]);
    } catch (e: any) {
      setPatientDetails({ error: e?.message || "Erro ao buscar detalhes" });
    }
  };

  const fetchPacientes = useCallback(
    async (pageToFetch: number) => {
      if (isFetching || !hasNext) return;
      setIsFetching(true);
      setError(null);
      try {
        const res = await patientsService.list();
        const mapped: Patient[] = res.map((p: any) => ({
          id: String(p.id ?? ""),
          nome: p.full_name ?? "",
          telefone: p.phone_mobile ?? p.phone1 ?? "",
          cidade: p.city ?? "",
          estado: p.state ?? "",
          ultimoAtendimento: p.last_visit_at ?? "",
          proximoAtendimento: p.next_appointment_at ?? "",
          vip: Boolean(p.vip ?? false),
          convenio: p.convenio ?? "",
          status: p.status ?? undefined,
        }));

        setPatients((prev) => {
          const all = [...prev, ...mapped];
          const unique = Array.from(new Map(all.map((p) => [p.id, p])).values());
          return unique;
        });

        if (mapped.length === 0) {
          setHasNext(false);
        } else {
          setPage((prev) => prev + 1);
        }

      } catch (e: any) {
        setError(e?.message || "Erro ao buscar pacientes");
      } finally {
        setIsFetching(false);
      }
    },
    [isFetching, hasNext]
  );

  useEffect(() => {
    fetchPacientes(1);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  useEffect(() => {
    if (!observerRef.current || !hasNext) return;
    const observer = new window.IntersectionObserver((entries) => {
      if (entries[0].isIntersecting && !isFetching && hasNext) {
        fetchPacientes(page);
      }
    });
    observer.observe(observerRef.current);
    return () => {
      if (observerRef.current) {
        observer.unobserve(observerRef.current);
      }
    };
  }, [fetchPacientes, page, hasNext, isFetching]);

  const handleDeletePatient = async (patientId: string) => {
    try {
      await patientsService.delete(patientId);
      setPatients((prev) => prev.filter((p) => p.id !== patientId));
    } catch (e: any) {
      setError(e?.message || "Erro ao deletar paciente");
      alert("Erro ao deletar paciente.");
    }
    setDeleteDialogOpen(false);
    setPatientToDelete(null);
  };

  const openDeleteDialog = (patientId: string) => {
    setPatientToDelete(patientId);
    setDeleteDialogOpen(true);
  };

  const filteredPatients = patients.filter((patient) => {
    const matchesSearch =
      patient.nome?.toLowerCase().includes(searchTerm.toLowerCase()) ||
      patient.telefone?.includes(searchTerm);
    const matchesConvenio =
      convenioFilter === "all" || (patient.convenio ?? "") === convenioFilter;
    const matchesVip =
      vipFilter === "all" ||
      (vipFilter === "vip" && patient.vip) ||
      (vipFilter === "regular" && !patient.vip);

    return matchesSearch && matchesConvenio && matchesVip;
  });

  return (
    <SecretaryLayout>
      <div className="space-y-6">
        <div className="flex flex-col md:flex-row md:items-center md:justify-between gap-4">
          <div>
            <h1 className="text-xl md:text-2xl font-bold text-foreground">Pacientes</h1>
            <p className="text-muted-foreground text-sm md:text-base">Gerencie as informações de seus pacientes</p>
          </div>
          <div className="flex gap-2">
            <Link href="/secretary/pacientes/novo">
              <Button className="w-full md:w-auto">
                <Plus className="w-4 h-4 mr-2" />
                Adicionar
              </Button>
            </Link>
          </div>
        </div>

        <div className="flex flex-col md:flex-row flex-wrap gap-4 bg-card p-4 rounded-lg border border-border">
          <div className="flex items-center gap-2 w-full md:w-auto">
            <span className="text-sm font-medium text-foreground">Convênio</span>
            <Select value={convenioFilter} onValueChange={setConvenioFilter}>
              <SelectTrigger className="w-full md:w-40">
                <SelectValue placeholder="Selecione o Convênio" />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="all">Todos</SelectItem>
                <SelectItem value="Particular">Particular</SelectItem>
                <SelectItem value="SUS">SUS</SelectItem>
                <SelectItem value="Unimed">Unimed</SelectItem>
              </SelectContent>
            </Select>
          </div>
          <div className="flex items-center gap-2 w-full md:w-auto">
            <span className="text-sm font-medium text-foreground">VIP</span>
            <Select value={vipFilter} onValueChange={setVipFilter}>
              <SelectTrigger className="w-full md:w-32">
                <SelectValue placeholder="Selecione" />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="all">Todos</SelectItem>
                <SelectItem value="vip">VIP</SelectItem>
                <SelectItem value="regular">Regular</SelectItem>
              </SelectContent>
            </Select>
          </div>
          <div className="flex items-center gap-2 w-full md:w-auto">
            <span className="text-sm font-medium text-foreground">Aniversariantes</span>
            <Select>
              <SelectTrigger className="w-full md:w-32">
                <SelectValue placeholder="Selecione" />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="today">Hoje</SelectItem>
                <SelectItem value="week">Esta semana</SelectItem>
                <SelectItem value="month">Este mês</SelectItem>
              </SelectContent>
            </Select>
          </div>
          <Button variant="outline" className="ml-auto w-full md:w-auto">
            <Filter className="w-4 h-4 mr-2" />
            Filtro avançado
          </Button>
        </div>

        <div className="bg-white rounded-lg border border-gray-200">
          <div className="overflow-x-auto">
            {error && <div className="p-6 text-red-600">{`Erro ao carregar pacientes: ${error}`}</div>}
            <table className="w-full min-w-[600px]">
              <thead className="bg-gray-50 border-b border-gray-200">
                <tr>
                  <th className="text-left p-2 md:p-4 font-medium text-gray-700">Nome</th>
                  <th className="text-left p-2 md:p-4 font-medium text-gray-700">Telefone</th>
                  <th className="text-left p-2 md:p-4 font-medium text-gray-700">Cidade</th>
                  <th className="text-left p-2 md:p-4 font-medium text-gray-700">Estado</th>
                  <th className="text-left p-2 md:p-4 font-medium text-gray-700">Último atendimento</th>
                  <th className="text-left p-2 md:p-4 font-medium text-gray-700">Próximo atendimento</th>
                  <th className="text-left p-2 md:p-4 font-medium text-gray-700">Ações</th>
                </tr>
              </thead>
              <tbody>
                {filteredPatients.length === 0 && !isFetching ? (
                  <tr>
                    <td colSpan={7} className="p-8 text-center text-gray-500">
                      {patients.length === 0 ? "Nenhum paciente cadastrado" : "Nenhum paciente encontrado com os filtros aplicados"}
                    </td>
                  </tr>
                ) : (
                  filteredPatients.map((patient) => (
                    <tr key={patient.id} className="border-b border-gray-100 hover:bg-gray-50">
                      <td className="p-4">
                        <div className="flex items-center gap-3">
                          <div className="w-8 h-8 bg-gray-100 rounded-full flex items-center justify-center">
                            <span className="text-gray-600 font-medium text-sm">{patient.nome?.charAt(0) || "?"}</span>
                          </div>
                          <span className="font-medium text-gray-900">{patient.nome}</span>
                        </div>
                      </td>
                      <td className="p-4 text-gray-600">{patient.telefone}</td>
                      <td className="p-4 text-gray-600">{patient.cidade}</td>
                      <td className="p-4 text-gray-600">{patient.estado}</td>
                      <td className="p-4 text-gray-600">{formatDate(patient.ultimoAtendimento)}</td>
                      <td className="p-4 text-gray-600">{formatDate(patient.proximoAtendimento)}</td>
                      <td className="p-4">
                        <DropdownMenu>
                          <DropdownMenuTrigger asChild>
                            <Button variant="ghost" className="text-blue-600 hover:bg-blue-50 hover:text-blue-700 h-8 px-2">Ações</Button>
                          </DropdownMenuTrigger>
                          <DropdownMenuContent align="end">
                            <DropdownMenuItem onClick={() => openDetailsDialog(patient.id)}>
                              <Eye className="w-4 h-4 mr-2" />
                              Ver detalhes
                            </DropdownMenuItem>
                            <DropdownMenuItem asChild>
                              <Link href={`/secretary/pacientes/${patient.id}/editar`}>
                                <Edit className="w-4 h-4 mr-2" />
                                Editar
                              </Link>
                            </DropdownMenuItem>
                            <DropdownMenuItem>
                              <Calendar className="w-4 h-4 mr-2" />
                              Marcar consulta
                            </DropdownMenuItem>
                            <DropdownMenuItem className="text-red-600 focus:text-red-600" onClick={() => openDeleteDialog(patient.id)}>
                              <Trash2 className="w-4 h-4 mr-2" />
                              Excluir
                            </DropdownMenuItem>
                          </DropdownMenuContent>
                        </DropdownMenu>
                      </td>
                    </tr>
                  ))
                )}
              </tbody>
            </table>
            <div ref={observerRef} style={{ height: 1 }} />
            {isFetching && <div className="p-4 text-center text-gray-500">Carregando mais pacientes...</div>}
          </div>
        </div>

        <AlertDialog open={deleteDialogOpen} onOpenChange={setDeleteDialogOpen}>
          <AlertDialogContent>
            <AlertDialogHeader>
              <AlertDialogTitle>Confirmar exclusão</AlertDialogTitle>
              <AlertDialogDescription>Tem certeza que deseja excluir este paciente? Esta ação não pode ser desfeita.</AlertDialogDescription>
            </AlertDialogHeader>
            <AlertDialogFooter>
              <AlertDialogCancel>Cancelar</AlertDialogCancel>
              <AlertDialogAction onClick={() => patientToDelete && handleDeletePatient(patientToDelete)} className="bg-red-600 hover:bg-red-700">
                Excluir
              </AlertDialogAction>
            </AlertDialogFooter>
          </AlertDialogContent>
        </AlertDialog>

        <AlertDialog open={detailsDialogOpen} onOpenChange={setDetailsDialogOpen}>
          <AlertDialogContent>
            <AlertDialogHeader>
              <AlertDialogTitle>Detalhes do Paciente</AlertDialogTitle>
              {patientDetails === null ? (
                <div className="text-gray-500 text-center py-4">Carregando...</div>
              ) : 'error' in patientDetails ? (
                <div className="text-red-600 text-center py-4">{patientDetails.error}</div>
              ) : (
                <AlertDialogDescription asChild>
                  <div className="space-y-2 text-left max-h-[60vh] overflow-y-auto pr-2">
                    <p><strong>Nome:</strong> {patientDetails.full_name}</p>
                    <p><strong>CPF:</strong> {patientDetails.cpf || "-"}</p>
                    <p><strong>Email:</strong> {patientDetails.email || "-"}</p>
                    <p><strong>Telefone:</strong> {patientDetails.phone_mobile ?? patientDetails.phone1 ?? patientDetails.phone2 ?? "-"}</p>
                    <p><strong>Nome social:</strong> {patientDetails.social_name ?? "-"}</p>
                    <p><strong>Sexo:</strong> {patientDetails.sex ?? "-"}</p>
                    <p><strong>Tipo sanguíneo:</strong> {patientDetails.blood_type ?? "-"}</p>
                    <p><strong>Peso:</strong> {patientDetails.weight_kg ? `${patientDetails.weight_kg}kg` : "-"}</p>
                    <p><strong>Altura:</strong> {patientDetails.height_m ? `${patientDetails.height_m}m` : "-"}</p>
                    <p><strong>IMC:</strong> {patientDetails.bmi ?? "-"}</p>
                    <p><strong>Endereço:</strong> {patientDetails.street ?? "-"}</p>
                    <p><strong>Bairro:</strong> {patientDetails.neighborhood ?? "-"}</p>
                    <p><strong>Cidade:</strong> {patientDetails.city ?? "-"}</p>
                    <p><strong>Estado:</strong> {patientDetails.state ?? "-"}</p>
                    <p><strong>CEP:</strong> {patientDetails.cep ?? "-"}</p>
                    <p><strong>Criado em:</strong> {formatDate(patientDetails.created_at)}</p>
                    <p><strong>Atualizado em:</strong> {formatDate(patientDetails.updated_at)}</p>
                    <p><strong>Id:</strong> {patientDetails.id ?? "-"}</p>
                  </div>
                </AlertDialogDescription>
              )}
            </AlertDialogHeader>
            <AlertDialogFooter>
              <AlertDialogCancel>Fechar</AlertDialogCancel>
            </AlertDialogFooter>
          </AlertDialogContent>
        </AlertDialog>
      </div>
    </SecretaryLayout>
  );
}