import { HistorySource } from './history.types';

export const RAW_HISTORY_SOURCE: HistorySource = {
  name: 'raw',
  table: 'history_points',
  timeColumn: 'time',
  intervalSeconds: 0,
};

export const AGGREGATE_HISTORY_SOURCES: HistorySource[] = [
  { name: '1m', table: 'history_1m', timeColumn: 'bucket', intervalSeconds: 60 },
  { name: '5m', table: 'history_5m', timeColumn: 'bucket', intervalSeconds: 300 },
  { name: '1h', table: 'history_1h', timeColumn: 'bucket', intervalSeconds: 3600 },
  { name: '1d', table: 'history_1d', timeColumn: 'bucket', intervalSeconds: 86400 },
];

// Подбирает самый дешевый слой данных под диапазон и целевое число точек на графике.
export function chooseHistorySource(
  from: Date,
  to: Date,
  targetPoints: number,
): HistorySource {
  const durationSeconds = Math.max((to.getTime() - from.getTime()) / 1000, 1);
  const desiredSeconds = durationSeconds / targetPoints;

  if (desiredSeconds < 60) {
    return RAW_HISTORY_SOURCE;
  }

  if (desiredSeconds < 300) {
    return AGGREGATE_HISTORY_SOURCES[0];
  }

  if (desiredSeconds < 3600) {
    return AGGREGATE_HISTORY_SOURCES[1];
  }

  if (desiredSeconds < 86400) {
    return AGGREGATE_HISTORY_SOURCES[2];
  }

  return AGGREGATE_HISTORY_SOURCES[3];
}