(() => {
  const lineStyleSolid = window.LightweightCharts?.LineStyle?.Solid ?? 0;
  const modelOrder = Object.freeze(['kronos', 'timesfm', 'chronos']);
  const defaultLineWidth = 1;
  const modelLabels = Object.freeze({
    kronos: 'Kronos',
    timesfm: 'TimesFM',
    chronos: 'Chronos',
  });
  const defaultSelection = Object.freeze(
    Object.fromEntries(modelOrder.map((modelKey) => [modelKey, true]))
  );
  const modelTonePalette = Object.freeze({
    kronos: Object.freeze({
      up: '#2563eb',
      flat: '#c2410c',
      down: '#b91c1c',
    }),
    timesfm: Object.freeze({
      up: '#16a34a',
      flat: '#eab308',
      down: '#ef4444',
    }),
    chronos: Object.freeze({
      up: '#166534',
      flat: '#a39b6b',
      down: '#be185d',
    }),
  });
  const modelSeriesStyle = Object.freeze(
    Object.fromEntries(
      modelOrder.map((modelKey) => [
        modelKey,
        Object.freeze({
          lineWidth: defaultLineWidth,
          lineStyle: lineStyleSolid,
        }),
      ])
    )
  );

  function normalizeSelection(selection = null) {
    const requested = selection && typeof selection === 'object' ? selection : defaultSelection;
    const normalized = Object.fromEntries(
      modelOrder.map((modelKey) => [
        modelKey,
        Boolean(
          Object.prototype.hasOwnProperty.call(requested, modelKey)
            ? requested[modelKey]
            : defaultSelection[modelKey]
        ),
      ])
    );
    if (!Object.values(normalized).some(Boolean)) {
      normalized[modelOrder[0]] = true;
    }
    return normalized;
  }

  function signature(selection = null) {
    const normalized = normalizeSelection(selection);
    return modelOrder
      .map((modelKey) => `${modelKey[0]}${normalized[modelKey] ? 1 : 0}`)
      .join('');
  }

  function createEmptyLines() {
    return Object.fromEntries(modelOrder.map((modelKey) => [modelKey, []]));
  }

  window.AIFORECAST_MODEL_CONFIG = Object.freeze({
    modelOrder,
    modelLabels,
    defaultSelection,
    defaultLineWidth,
    modelTonePalette,
    modelSeriesStyle,
    normalizeSelection,
    signature,
    createEmptyLines,
  });
})();