const numberFormatter = new Intl.NumberFormat("en-GB", {
    maximumFractionDigits: 2,
    minimumFractionDigits: 0
})

const dateFormatter = new Intl.DateTimeFormat("en-GB", {
    year: "numeric",
    month: "2-digit",
    day: "2-digit",
    hour: "2-digit",
    minute: "2-digit",
    second: "2-digit",
    hour12: false
})

export function formatNumber(num: number) {
    return numberFormatter.format(num)
}
export function formatDate(timestamp: number) {
    return dateFormatter.format(new Date(timestamp))
}
export function formatSecondsToTime(seconds: number) {
    if (!Number.isFinite(seconds)) return "0s"
    seconds = Math.floor(Math.max(0, seconds))
    const days = Math.floor(seconds / 86400)
    const hours = Math.floor((seconds % 86400) / 3600)
    const minutes = Math.floor((seconds % 3600) / 60)
    const secs = seconds % 60

    const parts: string[] = []
    if (days) parts.push(days + "d")
    if (hours) parts.push(hours + "h")
    if (minutes) parts.push(minutes + "m")
    if (secs || parts.length === 0) parts.push(secs + "s")

    if (parts.length === 1) return parts[0]
    if (parts.length === 2) return parts[0] + " and " + parts[1]
    // For 3+ parts: separate first n-1 by comma+space, last preceded by 'and'
    return parts.slice(0, -1).join(", ") + " and " + parts[parts.length - 1]
}

export function formatRelativeTime(timestamp: number, type: "past" | "future") {
    const now = Date.now()
    let diffMs = timestamp - now
    const past = diffMs < 0
    diffMs = Math.abs(diffMs)
    const suffixString = type === "past" ? " ago" : ""

    const seconds = Math.floor(diffMs / 1000)
    const days = Math.floor(seconds / 86400)
    const hours = Math.floor((seconds % 86400) / 3600)
    const minutes = Math.floor((seconds % 3600) / 60)
    const secs = seconds % 60

    const parts: string[] = []
    if (days) parts.push(days + " days,")
    if (hours) parts.push(hours + " hours,")
    if (minutes) parts.push(minutes + " minutes and")
    if (!parts.length || secs) parts.push(secs + " seconds")

    const str = parts.slice(0, 4).join(" ")
    return past ? str + suffixString : "in " + str
}