/* Chan web API client helpers */
window.ChanApi = {
  analyze: function(params) {
    const q = new URLSearchParams(params);
    return fetch('/api/analyze?' + q.toString()).then(r => r.json());
  },
  chartMetadata: function() {
    return fetch('/api/chart_metadata').then(r => r.json());
  },
  symbols: function() {
    return fetch('/api/symbols').then(r => r.json());
  },
  derivatives: function(params) {
    const q = new URLSearchParams(params || {});
    return fetch('/api/derivatives?' + q.toString()).then(function(r) {
      return r.json().then(function(body) {
        if (!r.ok) throw new Error((body && body.error) || r.statusText);
        return body;
      });
    });
  },
  sentimentLatest: function(params) {
    const q = new URLSearchParams(params || {});
    return fetch('/api/sentiment/latest?' + q.toString()).then(function(r) {
      return r.json().then(function(body) {
        if (!r.ok) throw new Error((body && body.error) || r.statusText);
        return body;
      });
    });
  },
  sentimentMetrics: function(params) {
    const q = new URLSearchParams(params || {});
    return fetch('/api/sentiment/metrics?' + q.toString()).then(function(r) {
      return r.json().then(function(body) {
        if (!r.ok) throw new Error((body && body.error) || r.statusText);
        return body;
      });
    });
  },
  macdConfig: function(body) {
    if (body === undefined) return fetch('/api/macd_config').then(r => r.json());
    return fetch('/api/macd_config', {
      method: 'POST',
      headers: {'Content-Type': 'application/json'},
      body: JSON.stringify(body)
    }).then(r => r.json());
  }
};