using System.Reflection;
using Spectre.Console;
using AnchorCli.OpenRouter;

namespace AnchorCli;

/// <summary>
/// Renders the application header, including ASCII art logo and configuration info table.
/// </summary>
internal sealed class HeaderRenderer
{
    private readonly string _model;
    private readonly string _endpoint;
    private readonly string _providerName;
    private readonly ModelInfo? _modelInfo;
    private readonly TokenTracker? _tokenTracker;

    public HeaderRenderer(
        string model,
        string endpoint,
        string providerName,
        ModelInfo? modelInfo = null,
        TokenTracker? tokenTracker = null)
    {
        _model = model;
        _endpoint = endpoint;
        _providerName = providerName;
        _modelInfo = modelInfo;
        _tokenTracker = tokenTracker;
    }

    /// <summary>
    /// Renders the full header including logo, subtitle, and info table.
    /// </summary>
    public void Render()
    {
        RenderLogo();
        RenderSubtitle();
        RenderInfoTable();
    }

    /// <summary>
    /// Renders the ASCII art logo.
    /// </summary>
    public void RenderLogo()
    {
        var fontStream = Assembly.GetExecutingAssembly().GetManifestResourceStream("AnchorCli.Assets.3d.flf");
        if (fontStream != null)
        {
            var font = FigletFont.Load(fontStream);
            AnsiConsole.Write(
                new FigletText(font, "anchor")
                    .Color(Color.CornflowerBlue));
        }
        else
        {
            AnsiConsole.Write(
                new FigletText("anchor")
                    .Color(Color.CornflowerBlue));
        }
    }

    /// <summary>
    /// Renders the subtitle rule.
    /// </summary>
    public void RenderSubtitle()
    {
        AnsiConsole.Write(
            new Rule("[dim]AI-powered coding assistant[/]")
                .RuleStyle(Style.Parse("cornflowerblue dim"))
                .LeftJustified());
        AnsiConsole.WriteLine();
    }

    /// <summary>
    /// Renders the configuration info table.
    /// </summary>
    public void RenderInfoTable()
    {
        var version = Assembly.GetExecutingAssembly().GetName().Version?.ToString() ?? "unknown";

        var table = new Table()
            .Border(TableBorder.Rounded)
            .BorderColor(Color.Grey)
            .AddColumn(new TableColumn("[dim]Setting[/]").NoWrap())
            .AddColumn(new TableColumn("[dim]Value[/]"));

        table.AddRow("[grey]Model[/]", $"[cyan]{Markup.Escape(_modelInfo?.Name ?? _model)}[/]");
        table.AddRow("[grey]Provider[/]", $"[blue]{_providerName}[/]");
        table.AddRow("[grey]Endpoint[/]", $"[dim]{_endpoint}[/]");
        table.AddRow("[grey]Version[/]", $"[magenta]{version}[/]");

        if (_modelInfo?.Pricing != null && _tokenTracker != null)
        {
            var inM = _tokenTracker.InputPrice * 1_000_000m;
            var outM = _tokenTracker.OutputPrice * 1_000_000m;
            table.AddRow("[grey]Pricing[/]",
                $"[yellow]${inM:F2}[/][dim]/M in[/]  [yellow]${outM:F2}[/][dim]/M out[/]");
        }

        if (_modelInfo != null)
        {
            table.AddRow("[grey]Context[/]",
                $"[dim]{_modelInfo.ContextLength:N0} tokens[/]");
        }

        AnsiConsole.Write(table);
        AnsiConsole.WriteLine();
    }
}