// Serviço para comunicação com o backend
const API_BASE_URL =
  import.meta.env.VITE_API_URL || "http://localhost:3000/api";

interface ApiResponse<T> {
  data: T | null;
  error: string | null;
  isBackendDown: boolean;
}

// Função auxiliar para fazer requisições
async function fetchFromBackend<T>(endpoint: string): Promise<ApiResponse<T>> {
  try {
    const response = await fetch(`${API_BASE_URL}${endpoint}`, {
      method: "GET",
      headers: {
        "Content-Type": "application/json",
      },
    });

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data = await response.json();
    return {
      data,
      error: null,
      isBackendDown: false,
    };
  } catch (error) {
    console.error(`Error fetching ${endpoint}:`, error);
    return {
      data: null,
      error: error instanceof Error ? error.message : "Erro desconhecido",
      isBackendDown: true,
    };
  }
}

// Funções específicas para cada endpoint

/**
 * Busca as funções profissionais disponíveis
 */
export async function getProfessionalRoles(): Promise<ApiResponse<string[]>> {
  return fetchFromBackend<string[]>("/professional-roles");
}

/**
 * Busca as empresas disponíveis
 */
export async function getCompanies(): Promise<
  ApiResponse<
    Array<{
      id: string;
      nome: string;
    }>
  >
> {
  return fetchFromBackend("/api/empresas");
}

/**
 * Busca as funções profissionais disponíveis do backend
 */
export async function getFunctions(): Promise<
  ApiResponse<
    Array<{
      id: string;
      nome: string;
    }>
  >
> {
  return fetchFromBackend("/api/funcoes");
}

/**
 * Cria um novo perfil profissional
 */
export async function createProfessional(data: any, token?: string): Promise<ApiResponse<any>> {
  try {
    const headers: any = {
      "Content-Type": "application/json",
    };

    if (token) {
      headers["Authorization"] = `Bearer ${token}`;
    }

    const response = await fetch(`${API_BASE_URL}/api/profissionais`, {
      method: "POST",
      headers: headers,
      body: JSON.stringify(data),
    });

    if (!response.ok) {
      const errorData = await response.json().catch(() => ({}));
      throw new Error(errorData.error || `HTTP error! status: ${response.status}`);
    }

    const responseData = await response.json();
    return {
      data: responseData,
      error: null,
      isBackendDown: false,
    };
  } catch (error) {
    console.error("Error creating professional:", error);
    return {
      data: null,
      error: error instanceof Error ? error.message : "Erro desconhecido",
      isBackendDown: true,
    };
  }
}

export interface EventTypeResponse {
  id: string;
  nome: string;
  precos: any[];
}

/**
 * Busca os tipos de eventos disponíveis
 */
export async function getEventTypes(): Promise<
  ApiResponse<EventTypeResponse[]>
> {
  return fetchFromBackend<EventTypeResponse[]>("/api/tipos-eventos");
}

/**
 * Busca os cursos/turmas disponíveis
 */
export async function getCourses(): Promise<
  ApiResponse<
    Array<{
      id: string;
      name: string;
      institution: string;
      year: number;
    }>
  >
> {
  return fetchFromBackend("/courses");
}

/**
 * Busca as instituições/empresas disponíveis
 */
export async function getInstitutions(): Promise<
  ApiResponse<
    Array<{
      id: string;
      name: string;
    }>
  >
> {
  return fetchFromBackend("/institutions");
}

/**
 * Busca os anos de formatura disponíveis
 */
export async function getGraduationYears(): Promise<ApiResponse<Array<{ id: string; ano_semestre: string }>>> {
  return fetchFromBackend<Array<{ id: string; ano_semestre: string }>>("/api/anos-formaturas");
}

/**
 * Busca os cursos disponíveis
 */
export async function getAvailableCourses(): Promise<ApiResponse<Array<{ id: string; nome: string }>>> {
  return fetchFromBackend<Array<{ id: string; nome: string }>>("/api/cursos");
}

/**
 * Busca a listagem de Cadastro FOT
 */
/**
 * Busca a listagem de Cadastro FOT
 */
export async function getCadastroFot(token: string, empresaId?: string): Promise<ApiResponse<any[]>> {
  try {
    let url = `${API_BASE_URL}/api/cadastro-fot`;
    if (empresaId) {
      url += `?empresa_id=${empresaId}`;
    }

    const response = await fetch(url, {
      method: "GET",
      headers: {
        "Content-Type": "application/json",
        "Authorization": `Bearer ${token}`
      },
    });

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data = await response.json();
    return {
      data,
      error: null,
      isBackendDown: false,
    };
  } catch (error) {
    console.error("Error fetching cadastro fot:", error);
    return {
      data: null,
      error: error instanceof Error ? error.message : "Erro desconhecido",
      isBackendDown: true,
    };
  }
}

/**
 * Cria um novo cadastro FOT
 */
export async function createCadastroFot(data: any, token: string): Promise<ApiResponse<any>> {
  try {
    const response = await fetch(`${API_BASE_URL}/api/cadastro-fot`, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        "Authorization": `Bearer ${token}`
      },
      body: JSON.stringify(data),
    });

    if (!response.ok) {
      const errorData = await response.json().catch(() => ({}));
      throw new Error(errorData.error || `HTTP error! status: ${response.status}`);
    }

    const responseData = await response.json();
    return {
      data: responseData,
      error: null,
      isBackendDown: false,
    };
  } catch (error) {
    console.error("Error creating cadastro fot:", error);
    return {
      data: null,
      error: error instanceof Error ? error.message : "Erro desconhecido",
      isBackendDown: true,
    };
  }
}

/**
 * Busca os níveis educacionais disponíveis (EF I / EF II)
 */
export async function getEducationLevels(): Promise<
  ApiResponse<
    Array<{
      id: string;
      nome: string;
    }>
  >
> {
  return fetchFromBackend("/api/niveis-educacionais");
}

/**
 * Busca as universidades cadastradas
 */
export async function getUniversities(): Promise<
  ApiResponse<
    Array<{
      id: string;
      nome: string;
    }>
  >
> {
  return fetchFromBackend("/api/universidades");
}

// Agenda
export const createAgenda = async (token: string, data: any) => {
  try {
    const response = await fetch(`${API_BASE_URL}/api/agenda`, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        "Authorization": `Bearer ${token}`
      },
      body: JSON.stringify(data),
    });

    if (!response.ok) {
      const errorData = await response.json().catch(() => ({}));
      throw new Error(errorData.error || `HTTP error! status: ${response.status}`);
    }

    const responseData = await response.json();
    return { data: responseData, error: null };
  } catch (error: any) {
    console.error("Erro ao criar agenda:", error);
    return { data: null, error: error.message || "Erro ao criar agenda" };
  }
};

// Agenda
export const getAgendas = async (token: string): Promise<ApiResponse<any[]>> => {
  try {
    const response = await fetch(`${API_BASE_URL}/api/agenda`, {
      method: "GET",
      headers: {
        "Content-Type": "application/json",
        "Authorization": `Bearer ${token}`
      },
    });

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data = await response.json();
    return { data, error: null, isBackendDown: false };
  } catch (error: any) {
    console.error("Erro ao buscar agendas:", error);
    return { data: null, error: error.message || "Erro ao buscar agendas", isBackendDown: true };
  }
};



/**
 * Busca usuários pendentes de aprovação
 */
export async function getPendingUsers(token: string): Promise<ApiResponse<any[]>> {
  try {
    const response = await fetch(`${API_BASE_URL}/api/admin/users/pending`, {
      method: "GET",
      headers: {
        "Content-Type": "application/json",
        "Authorization": `Bearer ${token}`
      },
    });

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data = await response.json();
    return {
      data,
      error: null,
      isBackendDown: false,
    };
  } catch (error) {
    console.error("Error fetching pending users:", error);
    return {
      data: null,
      error: error instanceof Error ? error.message : "Erro desconhecido",
      isBackendDown: true,
    };
  }
}

/**
 * Aprova um usuário
 */
export async function approveUser(userId: string, token: string): Promise<ApiResponse<any>> {
  try {
    const response = await fetch(`${API_BASE_URL}/api/admin/users/${userId}/approve`, {
      method: "PATCH",
      headers: {
        "Content-Type": "application/json",
        "Authorization": `Bearer ${token}`
      },
    });

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data = await response.json();
    return {
      data,
      error: null,
      isBackendDown: false,
    };
  } catch (error) {
    console.error("Error approving user:", error);
    return {
      data: null,
      error: error instanceof Error ? error.message : "Erro desconhecido",
      isBackendDown: true,
    };
  }
}

/**
 * Rejeita um usuário
 */
export async function rejectUser(userId: string, token: string): Promise<ApiResponse<any>> {
  try {
    const response = await fetch(`${API_BASE_URL}/api/admin/users/${userId}/reject`, {
      method: "PATCH",
      headers: {
        "Content-Type": "application/json",
        "Authorization": `Bearer ${token}`
      },
      // body: JSON.stringify({ reason }) // Future improvement
    });

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data = await response.json();
    return {
      data,
      error: null,
      isBackendDown: false,
    };
  } catch (error) {
    console.error("Error rejecting user:", error);
    return {
      data: null,
      error: error instanceof Error ? error.message : "Erro desconhecido",
      isBackendDown: true,
    };
  }
}