// frontend/js/api.js
const API_BASE = `http://${window.location.hostname}:5000/api`;


function getHeaders() {
  const token = localStorage.getItem('token');
  const headers = { "Content-Type": "application/json" };
  if (token) headers["Authorization"] = `Bearer ${token}`;
  return headers;
}

async function handleResponse(res) {
  if (res.status === 401) {
      localStorage.removeItem('token');
      window.location.reload();
  }
  const data = await res.json();
  if (!res.ok) throw new Error(data.error || data.message || 'API Error');
  return data;
}

export async function login(username, password) {
  const res = await fetch(`${API_BASE}/auth/login`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ username, password }),
  });
  return await handleResponse(res);
}

export async function register(username, password) {
  const res = await fetch(`${API_BASE}/auth/register`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ username, password }),
  });
  return await handleResponse(res);
}

export async function getMe() {
  const res = await fetch(`${API_BASE}/auth/me`, { headers: getHeaders() });
  return await handleResponse(res);
}

export async function upgradePlan() {
  const res = await fetch(`${API_BASE}/auth/upgrade`, {
    method: "POST",
    headers: getHeaders()
  });
  return await handleResponse(res);
}

export async function getDashboardStats() {
  const res = await fetch(`${API_BASE}/dashboard/stats`, { headers: getHeaders() });
  return await handleResponse(res);
}

export function getCaseReportPdfUrl(caseId) {
    const token = localStorage.getItem('token');
    return `${API_BASE}/reports/case/${caseId}/pdf?token=${token}`; 
}

export function getExportCsvUrl() {
    const token = localStorage.getItem('token');
    return `${API_BASE}/reports/cases/csv?token=${token}`;
}

export async function fetchCases(params = {}) {
  const query = new URLSearchParams(params).toString();
  const res = await fetch(`${API_BASE}/cases${query ? `?${query}` : ''}`, { headers: getHeaders() });
  return await handleResponse(res);
}

export async function createCase(data) {
  const res = await fetch(`${API_BASE}/cases`, {
    method: "POST",
    headers: getHeaders(),
    body: JSON.stringify(data),
  });
  return await handleResponse(res);
}

export async function getCase(id) {
  const res = await fetch(`${API_BASE}/cases/${id}`, { headers: getHeaders() });
  return await handleResponse(res);
}

export async function updateCase(id, data) {
  const res = await fetch(`${API_BASE}/cases/${id}`, {
    method: "PUT",
    headers: getHeaders(),
    body: JSON.stringify(data),
  });
  return await handleResponse(res);
}

export async function deleteCase(id) {
  const res = await fetch(`${API_BASE}/cases/${id}`, { method: "DELETE", headers: getHeaders() });
  return await handleResponse(res);
}

export async function uploadFiles(caseId, fileList) {
  const form = new FormData();
  for (const f of fileList) {
    form.append("files", f);
  }
  const headers = getHeaders();
  delete headers["Content-Type"]; // let browser set boundary
  const res = await fetch(`${API_BASE}/cases/${caseId}/files`, {
    method: "POST",
    headers: headers,
    body: form,
  });
  return await handleResponse(res);
}

export async function listFiles(caseId) {
  const res = await fetch(`${API_BASE}/cases/${caseId}/files`, { headers: getHeaders() });
  return await handleResponse(res);
}

export async function getConfiguredPlatforms() {
  const res = await fetch(`${API_BASE}/credentials`, { headers: getHeaders() });
  const data = await handleResponse(res);
  return data.configured_platforms || [];
}

export async function saveCredentials(platform, data) {
  const res = await fetch(`${API_BASE}/credentials/${platform}`, {
    method: "POST",
    headers: getHeaders(),
    body: JSON.stringify(data),
  });
  return await handleResponse(res);
}