<?php
namespace Seria;

use Index\XNumber;
use Index\Colour\Colour;
use Index\Colour\ColourRGB;

final class Colours {
    public const RATIO_GOOD = 0x008000;
    public const RATIO_WARN = 0xFFAA00;
    public const RATIO_BAD  = 0xFF0000;

    public const FILE_UP_TO_1GB  = 0xA0F5B8;
    public const FILE_UP_TO_5GB  = 0xBAE9C7;
    public const FILE_UP_TO_10GB = 0xCCDDDD;
    public const FILE_UP_TO_20GB = 0xCCA1F4;
    public const FILE_UP_TO_50GB = 0xDB5FF1;
    public const FILE_OVER_50GB  = 0xEC32A4;

    private static array $colourCache = [];

    public static function forRatio(float $ratio): Colour {
        $warning = self::cached(self::RATIO_WARN);

        $ratio *= 2;
        if($ratio > 1)
            return Colour::mix(
                $warning,
                self::cached(self::RATIO_GOOD),
                XNumber::easeInQuad($ratio - 1)
            );

        return Colour::mix(
            self::cached(self::RATIO_BAD),
            $warning,
            XNumber::easeOutQuad($ratio)
        );
    }

    public static function forFileSize(int $bytes): Colour {
        // should this ratio as well?
        if($bytes >= 53687090000)
            return self::cached(self::FILE_OVER_50GB);
        if($bytes >= 21474840000)
            return self::cached(self::FILE_UP_TO_50GB);
        if($bytes >= 10737420000)
            return self::cached(self::FILE_UP_TO_20GB);
        if($bytes >= 5368709000)
            return self::cached(self::FILE_UP_TO_10GB);
        if($bytes >= 1073742000)
            return self::cached(self::FILE_UP_TO_5GB);
        return self::cached(self::FILE_UP_TO_1GB);
    }

    public static function cached(int $raw): Colour {
        if(array_key_exists($raw, self::$colourCache))
            return self::$colourCache[$raw];
        return self::$colourCache[$raw] = ColourRGB::fromRawRGB($raw);
    }
}