using UnityEngine;

/// <summary>
/// Placeholder on-screen match HUD: the current sub-phase + countdown (top centre) and a hunter crosshair
/// during the seek phase. Drawn with IMGUI (OnGUI) on purpose - it needs no Canvas / font asset authoring,
/// so the match-state logic can be exercised immediately; swap it for a proper uGUI canvas once the look is
/// finalised. Added at runtime by <see cref="MatchManager"/> (AddComponent), so it rides the persistent
/// manager object and reads <see cref="MatchManager.Instance"/> on every machine.
/// </summary>
[DisallowMultipleComponent]
public class MatchHud : MonoBehaviour
{
    private GUIStyle _phaseStyle;
    private GUIStyle _timeStyle;
    private int _lastSecond = -1; // countdown text cache: OnGUI runs 2+ times per frame,
    private string _timeText = ""; // so the string is only rebuilt when the displayed second changes

    private void OnGUI()
    {
        var match = MatchManager.Instance;
        if (!match || !match.MatchActive) return;

        EnsureStyles();

        int s = Mathf.CeilToInt(Mathf.Max(0f, match.LocalPhaseRemaining));
        if (s != _lastSecond)
        {
            _lastSecond = s;
            _timeText = $"{s / 60:0}:{s % 60:00}";
        }

        const float w = 360f;
        var phaseRect = new Rect((Screen.width - w) * 0.5f, 12f, w, 30f);
        var timeRect = new Rect(phaseRect.x, phaseRect.y + 28f, w, 36f);
        DrawShadowed(phaseRect, PhaseLabel(match.LocalSubPhase), _phaseStyle);
        DrawShadowed(timeRect, _timeText, _timeStyle);

        if (match.LocalSubPhase == MatchManager.MatchSubPhase.Seek && NetworkPlayerSetup.LocalViewerIsHunter())
            DrawCrosshair();
    }

    private static string PhaseLabel(MatchManager.MatchSubPhase phase)
    {
        switch (phase)
        {
            case MatchManager.MatchSubPhase.Hide: return "Verstecken";
            case MatchManager.MatchSubPhase.Seek: return "Suchen";
            case MatchManager.MatchSubPhase.Resolution: return "Auflösung";
            default: return "";
        }
    }

    private static void DrawCrosshair()
    {
        float cx = Screen.width * 0.5f;
        float cy = Screen.height * 0.5f;
        const float r = 8f, t = 2f;
        Color prev = GUI.color;
        GUI.color = new Color(1f, 1f, 1f, 0.85f);
        GUI.DrawTexture(new Rect(cx - r, cy - t * 0.5f, r * 2f, t), Texture2D.whiteTexture);
        GUI.DrawTexture(new Rect(cx - t * 0.5f, cy - r, t, r * 2f), Texture2D.whiteTexture);
        GUI.color = prev;
    }

    // One label drawn twice (dark offset behind, then the real colour) so it stays readable on any backdrop.
    private static void DrawShadowed(Rect r, string text, GUIStyle style)
    {
        if (string.IsNullOrEmpty(text)) return;
        Color real = style.normal.textColor;
        style.normal.textColor = new Color(0f, 0f, 0f, 0.7f);
        GUI.Label(new Rect(r.x + 1f, r.y + 1f, r.width, r.height), text, style);
        style.normal.textColor = real;
        GUI.Label(r, text, style);
    }

    private void EnsureStyles()
    {
        if (_phaseStyle == null) _phaseStyle = MakeCenteredBoldLabel(22);
        if (_timeStyle == null) _timeStyle = MakeCenteredBoldLabel(28);
    }

    private static GUIStyle MakeCenteredBoldLabel(int fontSize)
    {
        var style = new GUIStyle(GUI.skin.label)
        {
            alignment = TextAnchor.MiddleCenter,
            fontSize = fontSize,
            fontStyle = FontStyle.Bold,
        };
        style.normal.textColor = Color.white;
        return style;
    }
}