/**
 * Rajvidya Astro API — thin JavaScript SDK (ESM, Node 18+ and browser fetch).
 *
 * Usage example:
 *   import { RajvidyaClient, RajvidyaError } from './rajvidya.js';
 *
 *   const client = new RajvidyaClient('rv_prod_ABC_xyzxyzxyz');
 *
 *   // GET endpoint with parameters
 *   try {
 *     const kundli = await client.kundli('chart-123', 'en');
 *     console.log(`Credits charged: ${kundli.creditsCharged}`);
 *     console.log(`Moon sign: ${kundli.data.moon_sign}`);
 *   } catch (e) {
 *     if (e instanceof RajvidyaError) {
 *       console.error(`API error: ${e.message}`);
 *     }
 *   }
 *
 *   // POST endpoint
 *   const chart = await client.createChart({
 *     name: 'John Doe',
 *     birth_date: '1990-05-15',
 *     birth_time: '14:30:00',
 *     birth_place: 'New York, USA',
 *     latitude: 40.7128,
 *     longitude: -74.0060,
 *   });
 *   console.log(`Created chart: ${chart.data.id}`);
 */

export class RajvidyaError extends Error {
  constructor(statusCode, code, message) {
    super(`${code}: ${message}`);
    this.statusCode = statusCode;
    this.code = code;
    this.message = message;
  }
}

export class ApiResponse {
  constructor(statusCode, data, headers) {
    this.statusCode = statusCode;
    this.data = data;
    this.headers = headers;
    this.creditsCharged = headers.get?.('x-credits-charged');
    this.creditsRemaining = headers.get?.('x-credits-remaining');
    this.quotaResetAt = headers.get?.('x-quota-reset-at');
  }
}

export class RajvidyaClient {
  constructor(apiKey, baseUrl = 'https://rajvidya.com') {
    this.apiKey = apiKey;
    this.baseUrl = baseUrl.replace(/\/$/, '');
  }

  async _request(method, path, params = null, jsonBody = null) {
    let url = `${this.baseUrl}${path}`;

    if (params) {
      const query = Object.entries(params)
        .filter(([, v]) => v != null)
        .map(([k, v]) => `${k}=${encodeURIComponent(v)}`)
        .join('&');
      if (query) url = `${url}?${query}`;
    }

    const headers = {
      'X-API-Key': this.apiKey,
      'User-Agent': 'rajvidya-javascript-sdk/1.0',
    };

    const options = { method, headers };
    if (jsonBody) {
      options.body = JSON.stringify(jsonBody);
      headers['Content-Type'] = 'application/json';
    }

    let response;
    try {
      response = await fetch(url, options);
    } catch (e) {
      throw new RajvidyaError(0, 'network_error', `Network error: ${e.message}`);
    }

    let responseData;
    try {
      responseData = await response.json();
    } catch {
      throw new RajvidyaError(response.status, 'parse_error', 'Failed to parse response');
    }

    if (!response.ok) {
      const errorObj = responseData.error || {};
      const code = errorObj.code || 'http_error';
      const message = errorObj.message || response.statusText;
      throw new RajvidyaError(response.status, code, message);
    }

    return new ApiResponse(response.status, responseData, response.headers);
  }

  // Chart management
  createChart(data) {
    return this._request('POST', '/api/v1/charts/', null, data);
  }

  readChart(chartId) {
    return this._request('GET', '/api/v1/charts/', { chart_id: chartId });
  }

  updateChart(chartId, updates) {
    return this._request('POST', '/api/v1/charts/', null, { chart_id: chartId, ...updates });
  }

  // Kundli & birth chart
  kundli(chartId, lang = 'en') {
    return this._request('GET', '/api/v1/kundli/', { chart_id: chartId, lang });
  }

  // Dasha
  dasha(chartId, lang = 'en') {
    return this._request('GET', '/api/v1/dasha/', { chart_id: chartId, lang });
  }

  // Doshas
  doshas(chartId, lang = 'en') {
    return this._request('GET', '/api/v1/doshas/', { chart_id: chartId, lang });
  }

  // Horoscope
  rashifal(chartId, lang = 'en') {
    return this._request('GET', '/api/v1/rashifal/', { chart_id: chartId, lang });
  }

  todayHoroscope(chartId, lang = 'en') {
    return this._request('GET', '/api/v1/today/', { chart_id: chartId, lang });
  }

  // Transits & live sky
  liveSky(latitude, longitude, lang = 'en') {
    return this._request('GET', '/api/v1/live-sky/', { latitude, longitude, lang });
  }

  gochar(chartId, lang = 'en') {
    return this._request('GET', '/api/v1/gochar/', { chart_id: chartId, lang });
  }

  // Panchang
  panchang(latitude, longitude, lang = 'en') {
    return this._request('GET', '/api/v1/panchang/', { latitude, longitude, lang });
  }

  festivals(latitude, longitude, lang = 'en') {
    return this._request('GET', '/api/v1/festivals/', { latitude, longitude, lang });
  }

  choghadiya(latitude, longitude, lang = 'en') {
    return this._request('GET', '/api/v1/choghadiya/', { latitude, longitude, lang });
  }

  // Muhurta
  muhurtaMarriage(brideChartId, groomChartId, lang = 'en') {
    return this._request('GET', '/api/v1/muhurta/marriage/', {
      bride_chart_id: brideChartId,
      groom_chart_id: groomChartId,
      lang,
    });
  }

  // Compatibility
  compatibility(chart1Id, chart2Id, lang = 'en') {
    return this._request('GET', '/api/v1/compatibility/', {
      chart1_id: chart1Id,
      chart2_id: chart2Id,
      lang,
    });
  }

  matchingReport(brideChartId, groomChartId, lang = 'en') {
    return this._request('GET', '/api/v1/reports/matching/', {
      bride_chart_id: brideChartId,
      groom_chart_id: groomChartId,
      lang,
    });
  }

  // Numerology
  numerologyDashboard(name, lang = 'en') {
    return this._request('GET', '/api/v1/numerology/dashboard/', { name, lang });
  }

  numerologyPro(name, lang = 'en') {
    return this._request('GET', '/api/v1/numerology/pro/', { name, lang });
  }

  babyNames(birthChartId, lang = 'en') {
    return this._request('GET', '/api/v1/baby-names/', { birth_chart_id: birthChartId, lang });
  }

  // Biorhythm
  biorhythm(birthDate, lang = 'en') {
    return this._request('GET', '/api/v1/biorhythm/', { birth_date: birthDate, lang });
  }

  // Remedies
  remediesPrescription(chartId, lang = 'en') {
    return this._request('GET', '/api/v1/remedies/prescription/', { chart_id: chartId, lang });
  }

  // Vastu
  vastuAnalyze(floorPlanBase64, buildingType, orientationDegrees, lang = 'en') {
    return this._request('POST', '/api/v1/vastu/analyze/', null, {
      floor_plan_base64: floorPlanBase64,
      building_type: buildingType,
      orientation_degrees: orientationDegrees,
      lang,
    });
  }

  vastuSurroundings(latitude, longitude, lang = 'en') {
    return this._request('GET', '/api/v1/vastu/surroundings/', { latitude, longitude, lang });
  }

  vastuCatalog(lang = 'en') {
    return this._request('GET', '/api/v1/vastu/catalog/', { lang });
  }
}