using System.Linq;
using DonkeysAndDroids;
using Godot;
using RobotAndDonkey.Game.Execution.Commands;
using RobotAndDonkey.Game.Execution.Results;
using RobotAndDonkey.Game.GameState;
using System.Text;
using RobotAndDonkey.Game.Data;
using RobotAndDonkey.Game.Pois;

public partial class VictoryScreen : Control, IScreen
{
    public override void _Ready()
    {
        ContinueButton.Pressed += OnContinueButtonPressed;

        if (StatsLabel != null)
        {
            StatsLabel.BbcodeEnabled = true;
            StatsLabel.AutowrapMode = TextServer.AutowrapMode.Word;
            StatsLabel.Clear();
        }
    }

    public override void _Process(double delta)
    {
        UpdateGamepadScroll((float)delta);
    }

    private void UpdateGamepadScroll(float delta)
    {
        if (StatsLabel == null || !Visible)
            return;

        var axis = Input.GetActionStrength("tooltip_scroll_down") - Input.GetActionStrength("tooltip_scroll_up");

        if (Mathf.Abs(axis) < 0.1f)
            return;

        var verticalScrollBar = StatsLabel.GetVScrollBar();
        if (verticalScrollBar == null)
            return;

        verticalScrollBar.Value += axis * GamepadScrollSpeed * delta;
    }

    public void OnContinueButtonPressed()
    {
        if (m_Victory)
        {
            Main.Instance.StartMetaGame();
        }
        else
        {
            Main.Instance.Execute(new NextAssignmentCommand(Main.Instance.CurrentRequest.RequestId));
        }
    }

    public void Deactivate()
    {
    }

    public void EnableInputs()
    {
        ContinueButton.Disabled = false;
    }

    public void DisableInputs()
    {
        ContinueButton.Disabled = true;
    }

    public void Activate()
    {
    }

    public void Configure(CoreLoop coreLoop, Tween tween)
    {
        if (StatsLabel == null || tween == null)
            return;

        DisableInputs();

        BuildStats(coreLoop);

        StatsLabel.Modulate = new(1f, 1f, 1f, 0f);
        ContinueButton.Modulate = new(1f, 1f, 1f, 0f);

        tween.TweenProperty(StatsLabel, "modulate:a", 1.0f, 0.6f).SetTrans(Tween.TransitionType.Cubic).SetEase(Tween.EaseType.Out);
        tween.TweenInterval(0.2f);
        tween.TweenProperty(ContinueButton, "modulate:a", 1.0f, 0.4f).SetTrans(Tween.TransitionType.Cubic).SetEase(Tween.EaseType.Out);
        tween.TweenCallback(Callable.From(EnableInputs));
    }

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

    private void BuildStats(CoreLoop coreLoop)
    {
        var sheds = coreLoop.Board.Cells.Select(c => c.Poi as Shed).Where(s => s != null).ToArray();
        m_Victory = sheds.Sum(s => s.Remaining) == 0;
        ContinueButton.Text = m_Victory ? "New assignment" : "Continue";

        m_Builder.Clear();

        AppendTitle("Execution report", GetAssignmentSubtitle(coreLoop));
        
        AppendSectionHeader("Programs");
        AppendKeyValue("Programs executed", coreLoop.ProgramsExecuted.ToString());
        AppendKeyValue("Programs remaining", coreLoop.ProgramCount.ToString());
        AppendKeyValue("Instructions used", coreLoop.InstructionsUsed.ToString());
        AppendKeyValue("Instructions remaining", coreLoop.PatchDeck.Count.ToString());
        
        AppendSectionHeader("Stats");
        var deliveries = coreLoop.Board.Cells.Select(c => c.Poi as Shed).Where(s => s != null).Sum(s => s!.Remaining);
        var deliveryColor = deliveries == 0 ? ColorGood : ColorBad;
        AppendKeyValue("Deliveries pending", WrapColor(deliveries.ToString(), deliveryColor));
        var patchColor = coreLoop.PatchDeck.Count == 0 ? ColorBad : ColorGood;
        AppendKeyValue("Cards not drawn",  WrapColor(coreLoop.PatchDeck.Count.ToString(), patchColor));
        var energyLeft = coreLoop.Currency.Energy - Balancing.Instance.EndOfProgramEnergyReplenish;
        var energyLeftColor = energyLeft == 0 ? ColorBad : ColorGood;
        AppendKeyValue("Remaining energy", WrapColor(energyLeft.ToString(), energyLeftColor));

        AppendSectionHeader("Movement");
        AppendKeyValue("Path length", coreLoop.PathLength.ToString());
        AppendKeyValue("Tiles visited", coreLoop.CellsVisited.Count.ToString());

        AppendSectionHeader("Efficiency");

        var energyColor = coreLoop.EnergyWasted == 0 ? ColorGood : ColorBad;
        AppendKeyValue("Energy wasted", WrapColor(coreLoop.EnergyWasted.ToString(), energyColor));

        var overspillText = coreLoop.Overspill > 0 ? WrapColor(coreLoop.Overspill.ToString(), ColorBad) : WrapColor(coreLoop.Overspill.ToString(), ColorGood);
        AppendKeyValue("Overspill", overspillText);

        // Assignment / deliveries
        AppendSectionHeader("Assignment");
        AppendKeyValue("Total delivery", coreLoop.Currency.Delivery.ToString());
        AppendKeyValue("Glitches deferred", coreLoop.DeferGlitchCount.ToString());
        AppendKeyValue("Shop rerolls", coreLoop.RerollCount.ToString());

        StatsLabel.Text = m_Builder.ToString();
        StatsLabel.ScrollToLine(0);
    }

    private string GetAssignmentSubtitle(CoreLoop coreLoop)
    {
        if (m_Victory)
            return WrapColor("Victory! All goods delivered", ColorGood);

        if (coreLoop.Currency.Delivery <= 0)
            return WrapColor("No deliveries completed", ColorBad);

        if (coreLoop.EnergyWasted == 0 && coreLoop.Overspill == 0)
            return WrapColor("Perfectly efficient run", ColorGood);

        if (coreLoop.EnergyWasted <= 3 && coreLoop.Overspill <= 1)
            return WrapColor("Very efficient run", ColorGood);

        return WrapColor("Lots of room for optimization", ColorSubtitle);
    }

    // ----------------------------------------------------------------------
    // Small helpers, mirroring Tooltip.cs style
    // ----------------------------------------------------------------------

    private static string WrapColor(string text, string colorHex)
    {
        return $"[color={colorHex}]{text}[/color]";
    }

    private void AppendTitle(string title, string subtitle = null)
    {
        m_Builder.Append(WrapColor($"[b]{title}[/b]", ColorTitle));

        if (!string.IsNullOrEmpty(subtitle))
        {
            m_Builder.Append('\n');
            m_Builder.Append(subtitle);
        }

        m_Builder.Append('\n');
    }

    private void AppendSectionHeader(string title)
    {
        m_Builder.Append('\n');
        m_Builder.Append(WrapColor($"[b]{title}[/b]", ColorHeader));
        m_Builder.Append('\n');
    }

    private void AppendKeyValue(string key, string value)
    {
        m_Builder.Append(WrapColor($"{key}: ", ColorLabel)).Append(WrapColor(value, ColorText)).Append('\n');
    }

    private const string ColorTitle = "#ffd65c";
    private const string ColorSubtitle = "#aaaaaa";
    private const string ColorHeader = "#a5d6ff";
    private const string ColorLabel = "#cccccc";
    private const string ColorText = "#ffffff";
    private const string ColorGood = "#a5d6a7";
    private const string ColorBad = "#ef9a9a";
    private const string ColorMuted = "#9e9e9e";

    private readonly StringBuilder m_Builder = new();

    [Export]
    public float GamepadScrollSpeed = 800f;

    [ExportGroup("Buttons")] [Export]
    private Button ContinueButton;

    [ExportGroup("Stats")] [Export]
    private RichTextLabel StatsLabel;

    private bool m_Victory;
}