#nullable enable

using System;
using System.Linq;
using System.Text;
using Godot;
using SideScrollerGame.Content;
using SideScrollerGame.Content.Samples;
using SideScrollerGame.Content.Validation;

namespace SideScrollerGame.Debug;

public partial class ContentBrowserController : Control
{
    public override void _Ready()
    {
        ContentRegistry registry = SampleContent.CreateRegistry();
        ContentValidationResult validation = new ContentValidator().Validate(registry);
        string report = BuildReport(registry, validation);
        SetText(report);

        if (!ShouldValidateAndQuit())
        {
            return;
        }

        GD.Print(report);
        GD.Print(validation.HasErrors ? "Content validation failed" : "Content validation succeeded");
        GetTree().Quit(validation.HasErrors ? 1 : 0);
    }

    private static string BuildReport(ContentRegistry registry, ContentValidationResult validation)
    {
        StringBuilder builder = new();
        builder.AppendLine("Loaded content definitions:");
        foreach (string id in registry.AllDefinitionIds())
        {
            builder.AppendLine(id);
        }

        if (validation.Messages.Count > 0)
        {
            builder.AppendLine();
            builder.AppendLine("Validation messages:");
            foreach (ContentValidationMessage message in validation.Messages)
            {
                builder.AppendLine($"{message.Severity}: {message.Code}: {message.Message}");
            }
        }

        return builder.ToString().TrimEnd();
    }

    private static bool ShouldValidateAndQuit()
    {
        return IsHeadless() && OS.GetCmdlineUserArgs().Any(argument => argument.Equals(ValidateOnlyArgument, StringComparison.OrdinalIgnoreCase));
    }

    private static bool IsHeadless()
    {
        return DisplayServer.GetName().Equals("headless", StringComparison.OrdinalIgnoreCase);
    }

    private void SetText(string report)
    {
        Label? title = GetNodeOrNull<Label>("Title");
        if (title is not null)
        {
            title.Text = "Content Browser";
        }

        Label? content = GetNodeOrNull<Label>("Scroll/Content");
        if (content is not null)
        {
            content.Text = report;
        }
    }

    private const string ValidateOnlyArgument = "--content-validate-only";
}