import { IRGBANomral } from "./readColor"

export enum AlphaType {
    force,
    auto,
    none,
}
export function toHex(color: IRGBANomral, options?: { alphaFirst?: boolean; alphaType?: AlphaType }): string {
    let arr = [color.r, color.g, color.b]

    // AlphaType.force
    if (options?.alphaType === AlphaType.force) {
        arr.push(Math.round((color.alpha ?? 1) * 255))
    }
    // AlphaType.none
    else if (options?.alphaType === AlphaType.none) {
    }
    // AlphaType.auto
    else {
        if (color.alpha != undefined && color.alpha != 1) {
            arr.push(Math.round(color.alpha * 255))
        }
    }

    let hex = []

    for (let i = 0; i < arr.length; i++) {
        let num = Math.round(arr[i])
        let char = num.toString(16)
        if (char.length == 1) char = "0" + char

        if (i == 3) {
            if (options?.alphaFirst) {
                hex.unshift(char)
            } else {
                hex.push(char)
            }
        } else {
            hex.push(char)
        }
    }
    return "#" + hex.join("")
}