import React, { useState, useEffect } from "react";
import { Course, Institution } from "../types";
import { Input, Select } from "./Input";
import { Button } from "./Button";
import {
  GraduationCap,
  X,
  Check,
  AlertCircle,
  AlertTriangle,
} from "lucide-react";
import {
  getInstitutions,
  getGraduationYears,
  getCompanies,
  getEducationLevels,
  getUniversities,
} from "../services/apiService";

interface CourseFormProps {
  onCancel: () => void;
  onSubmit: (data: Partial<Course>) => void;
  initialData?: Course;
  userId: string;
  institutions: Institution[];
}

const UFS = [
  "AC",
  "AL",
  "AP",
  "AM",
  "BA",
  "CE",
  "DF",
  "ES",
  "GO",
  "MA",
  "MT",
  "MS",
  "MG",
  "PA",
  "PB",
  "PR",
  "PE",
  "PI",
  "RJ",
  "RN",
  "RS",
  "RO",
  "RR",
  "SC",
  "SP",
  "SE",
  "TO",
];

export const CourseForm: React.FC<CourseFormProps> = ({
  onCancel,
  onSubmit,
  initialData,
  userId,
  institutions,
}) => {
  const currentYear = new Date().getFullYear();
  const [formData, setFormData] = useState<Partial<Course>>(
    initialData || {
      name: "",
      institutionId: "",
      year: currentYear,
      semester: 1,
      graduationType: "",
      createdAt: new Date().toISOString(),
      createdBy: userId,
      isActive: true,
    }
  );

  // Novos campos
  const [fotId, setFotId] = useState("");
  const [empresaId, setEmpresaId] = useState("");
  const [educationLevel, setEducationLevel] = useState("");
  const [observacoes, setObservacoes] = useState("");
  const [instituicao, setInstituicao] = useState("");
  const [anoFormatura, setAnoFormatura] = useState(currentYear.toString());
  const [cidade, setCidade] = useState("");
  const [estado, setEstado] = useState("");
  const [gastosCaptacao, setGastosCaptacao] = useState("");
  const [preVenda, setPreVenda] = useState("nao");

  const [showToast, setShowToast] = useState(false);
  const [error, setError] = useState("");
  const [companies, setCompanies] = useState<
    Array<{ id: string; nome: string }>
  >([]);
  const [educationLevels, setEducationLevels] = useState<
    Array<{ id: string; nome: string }>
  >([]);
  const [universities, setUniversities] = useState<
    Array<{ id: string; nome: string }>
  >([]);
  const [graduationYears, setGraduationYears] = useState<number[]>([]);
  const [isBackendDown, setIsBackendDown] = useState(false);
  const [isLoadingData, setIsLoadingData] = useState(true);

  // Buscar dados do backend
  useEffect(() => {
    const fetchBackendData = async () => {
      setIsLoadingData(true);

      const [
        companiesResponse,
        yearsResponse,
        levelsResponse,
        universitiesResponse,
      ] = await Promise.all([
        getCompanies(),
        getGraduationYears(),
        getEducationLevels(),
        getUniversities(),
      ]);

      if (
        companiesResponse.isBackendDown ||
        yearsResponse.isBackendDown ||
        levelsResponse.isBackendDown ||
        universitiesResponse.isBackendDown
      ) {
        setIsBackendDown(true);
      } else {
        setIsBackendDown(false);
        if (companiesResponse.data) {
          setCompanies(companiesResponse.data);
        }
        if (yearsResponse.data) {
          setGraduationYears(yearsResponse.data);
        }
        if (levelsResponse.data) {
          setEducationLevels(levelsResponse.data);
        }
        if (universitiesResponse.data) {
          setUniversities(universitiesResponse.data);
        }
      }

      setIsLoadingData(false);
    };

    fetchBackendData();
  }, []);

  // Popular campos quando estiver editando
  useEffect(() => {
    if (initialData) {
      setFotId((initialData as any).fotId || "");
      setEmpresaId((initialData as any).empresaId || "");
      setEducationLevel((initialData as any).educationLevel || "");
      setObservacoes((initialData as any).observacoes || "");
      setInstituicao((initialData as any).instituicaoId || "");
      setAnoFormatura(
        (initialData as any).anoFormatura?.toString() || currentYear.toString()
      );
      setCidade((initialData as any).cidade || "");
      setEstado((initialData as any).estado || "");
      setGastosCaptacao((initialData as any).gastosCaptacao || "");
      setPreVenda((initialData as any).preVenda || "nao");
    }
  }, [initialData]);

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();

    // Validações
    if (!fotId || fotId.trim().length < 1) {
      setError("FOT é obrigatório");
      return;
    }

    if (!empresaId) {
      setError("Selecione uma empresa");
      return;
    }

    if (!educationLevel) {
      setError("Selecione o nível (EF I / EF II)");
      return;
    }

    if (!instituicao) {
      setError("Selecione uma instituição");
      return;
    }

    if (!anoFormatura) {
      setError("Selecione o ano de formatura");
      return;
    }

    if (!cidade || cidade.trim().length < 2) {
      setError("Cidade é obrigatória");
      return;
    }

    if (!estado) {
      setError("Selecione um estado");
      return;
    }

    // Montar objeto de dados com os novos campos
    const submitData = {
      ...formData,
      fotId,
      empresaId,
      educationLevel,
      observacoes,
      instituicao,
      anoFormatura: parseInt(anoFormatura),
      cidade,
      estado,
      gastosCaptacao,
      preVenda,
    };

    setShowToast(true);
    setTimeout(() => {
      onSubmit(submitData);
    }, 1000);
  };

  const formatCurrency = (value: string) => {
    // Remove tudo que não for número
    const numbers = value.replace(/\D/g, "");

    // Converte para número e formata
    const amount = parseFloat(numbers) / 100;
    return amount.toLocaleString("pt-BR", {
      style: "currency",
      currency: "BRL",
    });
  };

  const handleGastosCaptacaoChange = (value: string) => {
    if (value === "") {
      setGastosCaptacao("");
      return;
    }
    setGastosCaptacao(formatCurrency(value));
  };

  return (
    <div className="bg-white rounded-lg shadow-xl overflow-hidden max-w-2xl max-h-[85vh] overflow-y-auto mx-auto border border-gray-100 slide-up relative">
      {/* Success Toast */}
      {showToast && (
        <div className="absolute top-4 right-4 z-50 bg-brand-black text-white px-6 py-4 rounded shadow-2xl flex items-center space-x-3 fade-in">
          <Check className="text-brand-gold h-6 w-6" />
          <div>
            <h4 className="font-bold text-sm">Sucesso!</h4>
            <p className="text-xs text-gray-300">
              Curso cadastrado com sucesso.
            </p>
          </div>
        </div>
      )}

      {/* Form Header */}
      <div className="bg-gray-50 border-b px-8 py-6 flex justify-between items-center">
        <div className="flex items-center space-x-3">
          <GraduationCap className="text-brand-gold h-8 w-8" />
          <div>
            <h2 className="text-2xl font-serif text-brand-black">
              {initialData ? "Editar Turma FOT" : "Cadastrar Turma FOT"}
            </h2>
            <p className="text-sm text-gray-500 mt-1">
              Registre as informações da turma FOT
            </p>
          </div>
        </div>
        <button
          onClick={onCancel}
          className="p-2 hover:bg-gray-200 rounded-full transition-colors"
        >
          <X size={20} className="text-gray-600" />
        </button>
      </div>

      <form onSubmit={handleSubmit} className="p-8 space-y-6">
        {/* Erro global */}
        {error && (
          <div className="bg-red-50 border border-red-200 rounded-lg p-3 flex items-start">
            <AlertCircle
              size={18}
              className="text-red-500 mr-2 flex-shrink-0 mt-0.5"
            />
            <p className="text-sm text-red-700">{error}</p>
          </div>
        )}

        {/* Informações da Turma FOT */}
        <div className="space-y-4">
          <h3 className="text-sm font-semibold text-gray-700 tracking-wide uppercase">
            Informações da Turma FOT
          </h3>

          {/* FOT ID */}
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-2">
              FOT*
            </label>
            <input
              type="text"
              required
              value={fotId}
              onChange={(e) => {
                const value = e.target.value.replace(/\D/g, "").slice(0, 5);
                setFotId(value);
                setError("");
              }}
              className="w-full px-4 py-3 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-brand-gold"
              placeholder="Digite o identificador FOT"
              maxLength={5}
            />
          </div>

          {/* Empresa */}
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-2">
              Empresa*
            </label>
            <select
              required
              value={empresaId}
              onChange={(e) => {
                setEmpresaId(e.target.value);
                setError("");
              }}
              disabled={isLoadingData || isBackendDown}
              className="w-full px-4 py-3 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-brand-gold disabled:bg-gray-100 disabled:cursor-not-allowed"
            >
              <option value="">Selecione uma empresa</option>
              {companies.map((company) => (
                <option key={company.id} value={company.id}>
                  {company.nome}
                </option>
              ))}
            </select>
            {isBackendDown && (
              <div className="mt-2 flex items-center gap-2 text-sm text-red-600">
                <AlertTriangle size={16} />
                <span>
                  Backend não está rodando. Não é possível carregar empresas.
                </span>
              </div>
            )}
            {isLoadingData && !isBackendDown && (
              <div className="mt-2 text-sm text-gray-500">
                Carregando empresas...
              </div>
            )}
          </div>

          {/* EF I / EF II */}
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-2">
              Cursos*
            </label>
            <select
              required
              value={educationLevel}
              onChange={(e) => {
                setEducationLevel(e.target.value);
                setError("");
              }}
              disabled={isLoadingData || isBackendDown}
              className="w-full px-4 py-3 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-brand-gold disabled:bg-gray-100 disabled:cursor-not-allowed"
            >
              <option value="">Selecione o nível</option>
              {educationLevels.map((level) => (
                <option key={level.id} value={level.id}>
                  {level.nome}
                </option>
              ))}
            </select>
            {isBackendDown && (
              <div className="mt-2 flex items-center gap-2 text-sm text-red-600">
                <AlertTriangle size={16} />
                <span>
                  Backend não está rodando. Não é possível carregar níveis.
                </span>
              </div>
            )}
            {isLoadingData && !isBackendDown && (
              <div className="mt-2 text-sm text-gray-500">
                Carregando níveis...
              </div>
            )}
          </div>

          {/* Observações */}
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-2">
              Observações
            </label>
            <textarea
              value={observacoes}
              onChange={(e) => setObservacoes(e.target.value)}
              className="w-full px-4 py-3 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-brand-gold"
              rows={3}
              placeholder="Adicione observações sobre a turma..."
            />
          </div>

          {/* Instituição */}
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-2">
              Instituição (Universidade)*
            </label>
            <input
              type="text"
              required
              value={instituicao}
              onChange={(e) => {
                setInstituicao(e.target.value);
                setError("");
              }}
              placeholder="Digite o nome da universidade"
              className="w-full px-4 py-3 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-brand-gold"
            />
            {isBackendDown && (
              <div className="mt-2 flex items-center gap-2 text-sm text-red-600">
                <AlertTriangle size={16} />
                <span>Backend não está rodando.</span>
              </div>
            )}
            {isLoadingData && !isBackendDown && (
              <div className="mt-2 text-sm text-gray-500">
                Carregando universidades...
              </div>
            )}
          </div>

          {/* Ano Formatura */}
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-2">
              Ano de Formatura*
            </label>
            <select
              required
              value={anoFormatura}
              onChange={(e) => {
                setAnoFormatura(e.target.value);
                setError("");
              }}
              disabled={isLoadingData || isBackendDown}
              className="w-full px-4 py-3 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-brand-gold disabled:bg-gray-100 disabled:cursor-not-allowed"
            >
              <option value="">Selecione o ano</option>
              {graduationYears.map((year) => (
                <option key={year} value={year}>
                  {year}
                </option>
              ))}
            </select>
            {isBackendDown && (
              <div className="mt-2 flex items-center gap-2 text-sm text-red-600">
                <AlertTriangle size={16} />
                <span>Backend offline</span>
              </div>
            )}
          </div>

          {/* Cidade e Estado */}
          <div className="grid grid-cols-2 gap-4">
            <div>
              <label className="block text-sm font-medium text-gray-700 mb-2">
                Cidade*
              </label>
              <input
                type="text"
                required
                value={cidade}
                onChange={(e) => {
                  setCidade(e.target.value);
                  setError("");
                }}
                className="w-full px-4 py-3 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-brand-gold"
                placeholder="Cidade"
              />
            </div>

            <div>
              <label className="block text-sm font-medium text-gray-700 mb-2">
                Estado*
              </label>
              <select
                required
                value={estado}
                onChange={(e) => {
                  setEstado(e.target.value);
                  setError("");
                }}
                className="w-full px-4 py-3 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-brand-gold"
              >
                <option value="">UF</option>
                {UFS.map((uf) => (
                  <option key={uf} value={uf}>
                    {uf}
                  </option>
                ))}
              </select>
            </div>
          </div>

          {/* Gastos Captação */}
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-2">
              Gastos Captação
            </label>
            <input
              type="text"
              value={gastosCaptacao}
              onChange={(e) => handleGastosCaptacaoChange(e.target.value)}
              className="w-full px-4 py-3 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-brand-gold"
              placeholder="R$ 0,00"
            />
          </div>

          {/* Pré Venda */}
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-2">
              Pré Venda*
            </label>
            <select
              required
              value={preVenda}
              onChange={(e) => setPreVenda(e.target.value)}
              className="w-full px-4 py-3 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-brand-gold"
            >
              <option value="sim">Sim</option>
              <option value="nao">Não</option>
            </select>
          </div>
        </div>

        {/* Actions */}
        <div className="flex justify-end space-x-3 pt-6 border-t">
          <Button variant="outline" onClick={onCancel} type="button">
            Cancelar
          </Button>
          <Button type="submit" variant="secondary">
            {initialData ? "Salvar Alterações" : "Cadastrar Turma"}
          </Button>
        </div>
      </form>
    </div>
  );
};