using System;
using System.Globalization;

namespace StreamPlayer.Desktop.Models;

public sealed record UpdateInfo(
    int VersionCode,
    string VersionName,
    string ReleaseNotes,
    string DownloadUrl,
    string DownloadFileName,
    long DownloadSizeBytes,
    int DownloadCount,
    string ReleasePageUrl,
    int MinSupportedVersionCode,
    bool ForceUpdate)
{
    public bool IsUpdateAvailable(int currentVersionCode) => VersionCode > currentVersionCode;

    public bool IsMandatory(int currentVersionCode) =>
        ForceUpdate || (MinSupportedVersionCode > 0 && currentVersionCode < MinSupportedVersionCode);

    public string GetReleaseNotesPreview(int maxLength = 900)
    {
        if (string.IsNullOrWhiteSpace(ReleaseNotes))
        {
            return string.Empty;
        }
        if (ReleaseNotes.Length <= maxLength)
        {
            return ReleaseNotes.Trim();
        }
        return ReleaseNotes[..maxLength].TrimEnd() + Environment.NewLine + "…";
    }

    public string FormatSize()
    {
        if (DownloadSizeBytes <= 0)
        {
            return string.Empty;
        }
        string[] suffixes = { "B", "KB", "MB", "GB" };
        double size = DownloadSizeBytes;
        int index = 0;
        while (size >= 1024 && index < suffixes.Length - 1)
        {
            size /= 1024;
            index++;
        }
        return $"{size:0.##} {suffixes[index]}";
    }
}