export interface TimeSeriesEntry {
    year: number
    avg_rate: string
}

export type TimeSeriesData = Record<string, TimeSeriesEntry[]>

export async function getTimeSeries(
    regions: string[],
    taxType: string,
    startYear?: number,
    endYear?: number
): Promise<TimeSeriesData> {
    const params = new URLSearchParams({ tax_type: taxType })
    if (regions.length > 0) params.set('region', regions.join(','))
    if (startYear) params.set('start_year', String(startYear))
    if (endYear) params.set('end_year', String(endYear))

    const res = await fetch(`/api/taxes/timeseries?${params}`)
    const data = await res.json()
    return data.data
}