import { Variable, GLib } from "astal";

const calculateRamUsage = (): string => {
    try {
        const [success, meminfoBytes] = GLib.file_get_contents('/proc/meminfo');

        if (!success || !meminfoBytes) {
            throw new Error('Failed to read /proc/meminfo or file content is null.');
        }

        const meminfo = new TextDecoder('utf-8').decode(meminfoBytes);

        const totalMatch = meminfo.match(/MemTotal:\s+(\d+)/);
        const availableMatch = meminfo.match(/MemAvailable:\s+(\d+)/);

        if (!totalMatch || !availableMatch) {
            throw new Error('Failed to parse /proc/meminfo for memory values.');
        }

        const totalRamInBytes = parseInt(totalMatch[1], 10) * 1024;
        const availableRamInBytes = parseInt(availableMatch[1], 10) * 1024;

        let usedRam = totalRamInBytes - availableRamInBytes;
        usedRam = isNaN(usedRam) || usedRam < 0 ? 0 : usedRam;

        const ramstring = "    " + Math.floor(usedRam / totalRamInBytes * 100) + "%"

        return ramstring
    } catch (error) {
        console.error('Error calculating RAM usage:', error);
        return "";
    }
};

export default function Ram() {
    const ram_usage = Variable<string>("").poll(5000, () =>
        calculateRamUsage())

    return <box className="ram">
        <label 
            className="Ram"
            onDestroy={() => ram_usage.drop()}
            label={ram_usage()} />
    </box>
}