@using LANCommander.UI.Providers
@implements IDisposable
@inject TimeProvider TimeProvider
@namespace LANCommander.UI.Components

@if (Value.HasValue && Value.Value != DateTime.MinValue)
{
    if (Relative)
    {
        <Tooltip Title="@(RenderLocalTime())">
            @ToRelativeTime()
        </Tooltip>
    }
    else
    {
        @RenderLocalTime()
    }
}

@code {
    [Parameter] public DateTime? Value { get; set; }
    [Parameter] public bool Relative { get; set; } = false; 
    [Parameter] public string Format { get; set; } = "MM/dd/yyyy hh:mm tt";

    protected override void OnInitialized()
    {
        if (TimeProvider is LocalTimeProvider localTimeProvider)
            localTimeProvider.LocalTimeZoneChanged += LocalTimeZoneChanged;
    }

    private void LocalTimeZoneChanged(object? sender, EventArgs e)
    {
        _ = InvokeAsync(StateHasChanged);
    }

    private string RenderLocalTime()
    {
        return ToLocalTime().ToString(Format);
    }

    private DateTime ToLocalTime()
    {
        return Value?.Kind switch
        {
            DateTimeKind.Local => Value.GetValueOrDefault(),
            _ => DateTime.SpecifyKind(TimeZoneInfo.ConvertTimeFromUtc(Value.GetValueOrDefault(), TimeProvider.LocalTimeZone), DateTimeKind.Local)
        };
    }

    private string ToRelativeTime()
    {
        var now = DateTimeOffset.UtcNow;
        var timespan = now - ToLocalTime();

        if (timespan.TotalSeconds < 5)
            return "Just now";
        if (timespan.TotalMinutes < 1)
            return $"{(int)timespan.TotalSeconds} seconds ago";
        if (timespan.TotalMinutes < 2)
            return "A minute ago";
        if (timespan.TotalHours < 1)
            return $"{(int)timespan.TotalMinutes} minutes ago";
        if (timespan.TotalHours < 2)
            return "An hour ago";
        if (timespan.TotalHours < 24)
            return $"{(int)timespan.TotalHours} hours ago";
        if (timespan.TotalDays < 2)
            return "Yesterday";
        if (timespan.TotalDays < 7)
            return $"{(int)timespan.TotalDays} days ago";
        if (timespan.TotalDays < 14)
            return "A week ago";
        if (timespan.TotalDays < 31)
            return $"{(int)(timespan.TotalDays / 7)} weeks ago";
        if (timespan.TotalDays < 60)
            return "A month ago";
        if (timespan.TotalDays < 365)
            return $"{(int)(timespan.TotalDays / 30)} months ago";
        if (timespan.TotalDays < 730)
            return "A year ago";

        return $"{(int)(timespan.TotalDays / 365)} years ago";
    }
    
    public void Dispose()
    {
        if (TimeProvider is LocalTimeProvider localTimeProvider)
            localTimeProvider.LocalTimeZoneChanged -= LocalTimeZoneChanged;
    }
}