import { appConfig } from '../config/appConfig';

const buildQuery = (params) => {
  const entries = Object.entries(params)
    .filter(([, value]) => value !== undefined && value !== null && value !== '')
    .map(([key, value]) => `${encodeURIComponent(key)}=${encodeURIComponent(value)}`);

  return entries.length > 0 ? `?${entries.join('&')}` : '';
};

const requestJson = async (path, options = {}) => {
  const response = await fetch(`${appConfig.apiBaseUrl}${path}`, options);
  let payload = null;

  try {
    payload = await response.json();
  } catch {
    // Preserve the HTTP status when an upstream proxy returns a non-JSON body.
  }

  if (!response.ok) {
    const message = payload?.detail || payload?.message || `HTTP Error: ${response.status}`;
    throw new Error(message);
  }

  return payload;
};

export const getPlants = (companyId = appConfig.companyId) => (
  requestJson(`/plants/${companyId}`)
);

export const updatePlantAlerts = (companyId, plantId, alertsEnabled) => {
  if (!companyId) {
    throw new Error('발전소의 업체 ID가 없습니다.');
  }

  return requestJson(`/plants/${companyId}/${plantId}/alerts`, {
    method: 'PATCH',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ alerts_enabled: alertsEnabled }),
  });
};

export const getHourlyPlantStats = (plantId, date) => (
  requestJson(`/plants/${plantId}/stats/today${buildQuery({ date })}`)
);

export const getPlantStats = (plantId, params) => (
  requestJson(`/plants/${plantId}/stats${buildQuery(params)}`)
);

export const getComparisonStats = (params) => (
  requestJson('/plants/stats/comparison' + buildQuery(params))
);

export const uploadGenerationData = (plantId, uploadType, formData) => {
  const suffix = uploadType === 'monthly' ? '/monthly' : '';
  return requestJson(`/plants/${plantId}/upload${suffix}`, {
    method: 'POST',
    body: formData,
  });
};