using System;
using DonkeysAndDroids;
using Godot;
using RobotAndDonkey.Game;
using RobotAndDonkey.Game.Execution.Results;
using RobotAndDonkey.Game.Utils;

public partial class MetaGameScreen : Control, IScreen
{
    public override void _Ready()
    {
        m_SeedLineEdit = GetNode<LineEdit>("MarginContainer/MarginContainer/MainVBox/SeedRow/SeedLineEdit");
        m_RandomizeButton = GetNode<Button>("MarginContainer/MarginContainer/MainVBox/SeedRow/RandomizeButton");
        m_DifficultyOptionButton = GetNode<OptionButton>("MarginContainer/MarginContainer/MainVBox/DifficultyRow/DifficultyOptionButton");
        m_StartButton = GetNode<Button>("%StartButton");
        m_OptionsButton = GetNode<Button>("%OptionsButton");

        m_RobotContainer = GetNode<HBoxContainer>("MarginContainer/MarginContainer/MainVBox/RobotsSection/RobotsContainer");
        foreach (var robot in Enum.GetValues<ERobotType>())
        {
            var currentRobot = robot;
            var robotInstance = (Robot)RobotScene.Instantiate<Button>();
            robotInstance.Pressed += () => OnRobotButtonPressed(currentRobot);
            robotInstance.Name = robot.ToString();
            robotInstance.Texture = robot switch
            {
                ERobotType.Vintage => ResourceLoader.Load<Texture2D>("uid://b51acya8abb3p"),
                ERobotType.Courier => ResourceLoader.Load<Texture2D>("uid://c6h1eqa6n2ca8"),
                ERobotType.Analyst => ResourceLoader.Load<Texture2D>("uid://c6h1eqa6n2ca8"),
                ERobotType.Ranger  => ResourceLoader.Load<Texture2D>("uid://c6h1eqa6n2ca8"),
                _                  => throw new ArgumentOutOfRangeException()
            };

            m_RobotContainer.AddChild(robotInstance);
        }

        m_RobotButtons = new Button[m_RobotContainer.GetChildren().Count];
        for (var i = 0; i < m_RobotButtons.Length; i++)
        {
            m_RobotButtons[i] = (Button)m_RobotContainer.GetChildren()[i];
            // JAM

            if (i > 0)
                m_RobotButtons[i].Disabled = true;
        }

        m_DifficultyOptionButton.Clear();
        foreach (var difficulty in Enum.GetValues<EDifficulty>())
            m_DifficultyOptionButton.AddItem(difficulty.ToString(), (int)difficulty);
        m_DifficultyOptionButton.Selected = 0;

        m_RandomizeButton.Pressed += OnRandomizePressed;
        m_StartButton.Pressed += OnStartPressed;
        m_OptionsButton.Pressed += OnOptionsPressed;
        m_SeedLineEdit.TextChanged += OnSeedTextChanged;

        m_StartButton.Disabled = true;
        OnRandomizePressed();
    }

    private void OnOptionsPressed()
    {
        Main.Instance.OptionsMenu.ShowMenu();
    }

    public override void _UnhandledKeyInput(InputEvent @event)
    {
        if (@event.IsActionPressed("options") && !m_StartButton.Disabled)
        {
            Main.Instance.OptionsMenu.ShowMenu();
            GetViewport().SetInputAsHandled();
        }
    }

    private void OnRandomizePressed()
    {
        m_Seed = m_Random.Next(int.MaxValue);
        m_SeedLineEdit.Text = SeedString.ToString(m_Seed);
    }

    private void OnSeedTextChanged(string newText)
    {
        if (!SeedString.TryParse(newText, out m_Seed, true))
            m_Seed = 0;

        UpdateStartButtonState();
    }

    private void OnRobotButtonPressed(ERobotType robot)
    {
        m_SelectedRobot = robot;
        UpdateRobotButtonsVisual();
        UpdateStartButtonState();
    }

    private void UpdateRobotButtonsVisual()
    {
        var index = 0;
        foreach (var node in m_RobotContainer.GetChildren())
        {
            var robot = (ERobotType)index++;
            if (node is not Button button)
                continue;

            button.ButtonPressed = robot == m_SelectedRobot;
        }
    }

    private void UpdateStartButtonState()
    {
        var hasSeed = m_Seed > 0;
        var hasRobot = m_SelectedRobot >= 0;

        m_StartButton.Disabled = !(hasSeed && hasRobot);
    }

    private void OnStartPressed()
    {
        if (m_StartButton.Disabled)
            return;

        var seed = m_SeedLineEdit.Text.Trim();
        var difficulty = (EDifficulty)m_DifficultyOptionButton.Selected;

        GD.Print($"Starting game with Seed={seed}, Difficulty={difficulty}, Robot={m_SelectedRobot}");
        Main.Instance.StartCoreLoop(m_Seed, difficulty, m_SelectedRobot);
    }

    public void Deactivate()
    {
    }

    public void EnableInputs()
    {
        m_DifficultyOptionButton.Disabled = false;
        m_RandomizeButton.Disabled = false;
        m_StartButton.Disabled = false;
        
        // JAM
        m_RobotButtons[0].Disabled = false;
        //foreach (var button in m_RobotButtons)
        //    button.Disabled = false;

        m_SeedLineEdit.Editable = true;
    }

    public void DisableInputs()
    {
        m_DifficultyOptionButton.Disabled = true;
        m_RandomizeButton.Disabled = true;
        m_StartButton.Disabled = true;
        foreach (var button in m_RobotButtons)
            button.Disabled = true;
        m_SeedLineEdit.Editable = false;
    }

    public void Activate()
    {
    }

    public bool HandleResult(Result result, Tween tween)
    {
        return false;
    }

    [Export]
    public PackedScene RobotScene { get; set; }

    public string StringSeed => SeedString.ToString(m_Seed);

    private OptionButton m_DifficultyOptionButton;
    private Button m_RandomizeButton;
    private Button m_OptionsButton;
    private Button m_StartButton;
    private Button[] m_RobotButtons;
    private HBoxContainer m_RobotContainer;
    private LineEdit m_SeedLineEdit;

    private SRandom m_Random = new((ulong)DateTime.UtcNow.ToFileTimeUtc());
    private int m_Seed;
    private ERobotType m_SelectedRobot = ERobotType.Vintage;
}