using Godot;
using System;

public partial class WorldSetup : Control
{
	[Export] LineEdit seedInput;
	[Export] RichTextLabel seedPreview;

	public override void _Ready()
	{
		UIStyle.Apply(this);
		UpdateSeedPreview();
	}

	public void OnSeedChanged(string text)
	{
		UpdateSeedPreview();
	}

	public void OnStartPressed()
	{
		GameData.seed = GetSelectedSeed();
		GameData.loadSaveOnStart = false;
		GameData.showTutorial = true;
		GetTree().ChangeSceneToFile("res://Scenes/Game.tscn");
	}

	public void OnBackPressed()
	{
		GetTree().ChangeSceneToFile("res://Scenes/MainMenu.tscn");
	}

	private int GetSelectedSeed()
	{
		string text = seedInput.Text.Trim();
		if (text.Length <= 0)
		{
			return new Random().Next(1, int.MaxValue);
		}

		int numericSeed;
		if (int.TryParse(text, out numericSeed))
		{
			return numericSeed;
		}

		return CreateTextSeed(text);
	}

	private int CreateTextSeed(string text)
	{
		int hash = 17;
		foreach (char character in text)
		{
			hash = hash * 31 + character;
		}

		return Math.Abs(hash);
	}

	private void UpdateSeedPreview()
	{
		string text = seedInput.Text.Trim();
		if (text.Length <= 0)
		{
			seedPreview.Text = "No seed entered. B.O.B. will pick one from the ruins.";
			return;
		}

		seedPreview.Text = "Selected seed: " + GetSelectedSeed();
	}
}