import { Attendance, DashboardFilter, User } from '../types';

// URL do Backend
// Em produção (import.meta.env.PROD), usa caminho relativo '/api' pois o backend serve o frontend
// Em desenvolvimento, aponta para o localhost:3001
const API_URL = import.meta.env.PROD ? '/api' : 'http://localhost:3001/api'; 

const getHeaders = () => {
  const token = localStorage.getItem('ctms_token');
  // Evitar enviar "undefined" ou "null" como strings se o localStorage estiver corrompido
  if (!token || token === 'undefined' || token === 'null') return { 'Content-Type': 'application/json' };
  
  return {
    'Content-Type': 'application/json',
    'Authorization': `Bearer ${token}`
  };
};

export const getAttendances = async (tenantId: string, filter: DashboardFilter): Promise<Attendance[]> => {
  try {
    const params = new URLSearchParams();
    params.append('tenantId', tenantId);
    
    if (filter.dateRange.start) params.append('startDate', filter.dateRange.start.toISOString());
    if (filter.dateRange.end) params.append('endDate', filter.dateRange.end.toISOString());
    
    if (filter.userId && filter.userId !== 'all') params.append('userId', filter.userId);
    if (filter.teamId && filter.teamId !== 'all') params.append('teamId', filter.teamId);
    if (filter.funnelStage && filter.funnelStage !== 'all') params.append('funnelStage', filter.funnelStage);
    if (filter.origin && filter.origin !== 'all') params.append('origin', filter.origin);

    const response = await fetch(`${API_URL}/attendances?${params.toString()}`, {
      headers: getHeaders()
    });
    
    if (!response.ok) {
      throw new Error('Falha ao buscar atendimentos do servidor');
    }

    return await response.json();
  } catch (error) {
    console.error("API Error (getAttendances):", error);
    // Fallback vazio ou lançar erro para a UI tratar
    return []; 
  }
};

export const getUsers = async (tenantId: string): Promise<User[]> => {
  try {
    const params = new URLSearchParams();
    if (tenantId !== 'all') params.append('tenantId', tenantId);

    const response = await fetch(`${API_URL}/users?${params.toString()}`, {
      headers: getHeaders()
    });
    if (!response.ok) throw new Error('Falha ao buscar usuários');
    
    return await response.json();
  } catch (error) {
    console.error("API Error (getUsers):", error);
    return [];
  }
};

export const getUserById = async (id: string): Promise<User | undefined> => {
  try {
    const response = await fetch(`${API_URL}/users/${id}`, {
      headers: getHeaders()
    });
    if (!response.ok) return undefined;
    
    const contentType = response.headers.get("content-type");
    if (contentType && contentType.indexOf("application/json") !== -1) {
      return await response.json();
    }
    return undefined;
  } catch (error) {
    console.error("API Error (getUserById):", error);
    return undefined;
  }
};

export const updateUser = async (id: string, userData: any): Promise<boolean> => {
  try {
    const response = await fetch(`${API_URL}/users/${id}`, {
      method: 'PUT',
      headers: getHeaders(),
      body: JSON.stringify(userData)
    });
    return response.ok;
  } catch (error) {
    console.error("API Error (updateUser):", error);
    return false;
  }
};

export const uploadAvatar = async (id: string, file: File): Promise<string | null> => {
  try {
    const formData = new FormData();
    formData.append('avatar', file);

    const token = localStorage.getItem('ctms_token');
    const response = await fetch(`${API_URL}/users/${id}/avatar`, {
      method: 'POST',
      headers: {
        ...(token ? { 'Authorization': `Bearer ${token}` } : {})
      },
      body: formData
    });

    if (!response.ok) throw new Error('Falha no upload');
    const data = await response.json();
    return data.avatarUrl;
  } catch (error) {
    console.error("API Error (uploadAvatar):", error);
    return null;
  }
};

export const createMember = async (userData: any): Promise<boolean> => {
  try {
    const response = await fetch(`${API_URL}/users`, {
      method: 'POST',
      headers: getHeaders(),
      body: JSON.stringify(userData)
    });
    return response.ok;
  } catch (error) {
    console.error("API Error (createMember):", error);
    return false;
  }
};

export const deleteUser = async (id: string): Promise<boolean> => {
  try {
    const response = await fetch(`${API_URL}/users/${id}`, {
      method: 'DELETE',
      headers: getHeaders()
    });
    return response.ok;
  } catch (error) {
    console.error("API Error (deleteUser):", error);
    return false;
  }
};

export const getAttendanceById = async (id: string): Promise<Attendance | undefined> => {
  try {
    const response = await fetch(`${API_URL}/attendances/${id}`, {
      headers: getHeaders()
    });
    if (!response.ok) return undefined;
    
    const contentType = response.headers.get("content-type");
    if (contentType && contentType.indexOf("application/json") !== -1) {
      return await response.json();
    }
    return undefined;
  } catch (error) {
    console.error("API Error (getAttendanceById):", error);
    return undefined;
  }
};

export const getTenants = async (): Promise<any[]> => {
  try {
    const response = await fetch(`${API_URL}/tenants`, {
      headers: getHeaders()
    });
    if (!response.ok) throw new Error('Falha ao buscar tenants');
    
    const contentType = response.headers.get("content-type");
    if (contentType && contentType.indexOf("application/json") !== -1) {
      return await response.json();
    }
    return [];
  } catch (error) {
    console.error("API Error (getTenants):", error);
    return [];
  }
};

export const getTeams = async (tenantId: string): Promise<any[]> => {
  try {
    const response = await fetch(`${API_URL}/teams?tenantId=${tenantId}`, {
      headers: getHeaders()
    });
    if (!response.ok) throw new Error('Falha ao buscar equipes');
    return await response.json();
  } catch (error) {
    console.error("API Error (getTeams):", error);
    return [];
  }
};

export const createTeam = async (teamData: any): Promise<boolean> => {
  try {
    const response = await fetch(`${API_URL}/teams`, {
      method: 'POST',
      headers: getHeaders(),
      body: JSON.stringify(teamData)
    });
    return response.ok;
  } catch (error) {
    console.error("API Error (createTeam):", error);
    return false;
  }
};

export const updateTeam = async (id: string, teamData: any): Promise<boolean> => {
  try {
    const response = await fetch(`${API_URL}/teams/${id}`, {
      method: 'PUT',
      headers: getHeaders(),
      body: JSON.stringify(teamData)
    });
    return response.ok;
  } catch (error) {
    console.error("API Error (updateTeam):", error);
    return false;
  }
};

export const createTenant = async (tenantData: any): Promise<boolean> => {
  try {
    const response = await fetch(`${API_URL}/tenants`, {
      method: 'POST',
      headers: getHeaders(),
      body: JSON.stringify(tenantData)
    });
    return response.ok;
  } catch (error) {
    console.error("API Error (createTenant):", error);
    return false;
  }
};

// --- Auth Functions ---

export const logout = () => {
  localStorage.removeItem('ctms_token');
  localStorage.removeItem('ctms_user_id');
  localStorage.removeItem('ctms_tenant_id');
};

export const login = async (credentials: any): Promise<any> => {
  const response = await fetch(`${API_URL}/auth/login`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(credentials)
  });
  
  const contentType = response.headers.get("content-type");
  const isJson = contentType && contentType.indexOf("application/json") !== -1;
  
  if (!response.ok) {
    const error = isJson ? await response.json() : { error: 'Erro no servidor' };
    throw new Error(error.error || 'Erro no login');
  }
  
  const data = isJson ? await response.json() : null;
  if (data && data.token) {
    localStorage.setItem('ctms_token', data.token);
    localStorage.setItem('ctms_user_id', data.user.id);
    localStorage.setItem('ctms_tenant_id', data.user.tenant_id || '');
  }
  return data;
};

export const register = async (userData: any): Promise<boolean> => {
  const response = await fetch(`${API_URL}/auth/register`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(userData)
  });
  if (!response.ok) {
    const error = await response.json();
    throw new Error(error.error || 'Erro no registro');
  }
  return true;
};

export const verifyCode = async (data: any): Promise<boolean> => {
  const response = await fetch(`${API_URL}/auth/verify`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(data)
  });
  if (!response.ok) {
    const error = await response.json();
    throw new Error(error.error || 'Código inválido ou expirado');
  }
  return true;
};

export const forgotPassword = async (email: string): Promise<string> => {
  const response = await fetch(`${API_URL}/auth/forgot-password`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ email })
  });
  
  const contentType = response.headers.get("content-type");
  const isJson = contentType && contentType.indexOf("application/json") !== -1;
  
  if (!response.ok) {
    const error = isJson ? await response.json() : { error: 'Erro no servidor' };
    throw new Error(error.error || 'Erro ao processar solicitação');
  }
  
  const data = isJson ? await response.json() : { message: 'Solicitação processada' };
  return data.message;
};

export const resetPassword = async (password: string, token: string): Promise<string> => {
  const response = await fetch(`${API_URL}/auth/reset-password`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ password, token })
  });
  
  const contentType = response.headers.get("content-type");
  const isJson = contentType && contentType.indexOf("application/json") !== -1;
  
  if (!response.ok) {
    const error = isJson ? await response.json() : { error: 'Erro no servidor' };
    throw new Error(error.error || 'Erro ao resetar senha');
  }
  
  const data = isJson ? await response.json() : { message: 'Senha redefinida' };
  return data.message;
};