@using System.Timers
@using Iceshrimp.Frontend.Localization
@using Microsoft.Extensions.Localization
@inject IStringLocalizer<Localization> Loc;

<span title="@Date.ToLocalTime().ToString("G")">@RenderTimestamp()</span>

@code {
    [Parameter, EditorRequired] public required DateTime Date { get; set; }

    private string RenderTimestamp()
    {
        var diff = DateTime.UtcNow - Date.ToUniversalTime();

        return diff switch
        {
            { TotalDays: >= 365 }  => Loc["{0}y", Math.Floor(diff.TotalDays / 365)],
            { TotalDays: >= 30 }   => Loc["{0}mo", Math.Floor(diff.TotalDays / 30)],
            { TotalDays: >= 7 }    => Loc["{0}w", Math.Floor(diff.TotalDays / 7)],
            { TotalDays: >= 1 }    => Loc["{0}d", Math.Floor(diff.TotalDays)],
            { TotalHours: >= 1 }   => Loc["{0}h", Math.Floor(diff.TotalHours)],
            { TotalMinutes: >= 1 } => Loc["{0}m", Math.Floor(diff.TotalMinutes)],
            { TotalSeconds: >= 5 } => Loc["{0}s", Math.Floor(diff.TotalSeconds)],
            _                      => Loc["now"]
        };
    }

    protected override void OnInitialized()
    {
        ResetTimer();
    }

    private void UpdateDisplay(object? _, ElapsedEventArgs elapsedEventArgs)
    {
        StateHasChanged();
        ResetTimer();
    }

    private void ResetTimer()
    {
        var diff = DateTime.Now - Date;
        if (diff.TotalMinutes < 1) // Default of 1 seconds
        {
            SetTimer();
        }
        else if (diff.TotalHours < 1)
        {
            SetTimer(20000); // 20 seconds
        }
        else if (diff.TotalDays < 1 && diff.TotalHours > 1)
        {
            SetTimer(600000); // 10 minutes
        }
        else
        {
            SetTimer(3600000); // 1 hour
        }
    }

    private void SetTimer(int duration = 1000)
    {
        var timer = new Timer(duration);
        timer.Elapsed   += UpdateDisplay;
        timer.AutoReset =  false;
        timer.Enabled   =  true;
    }
}