using System.Collections;
using System.IO;
using NUnit.Framework;
using UnityEngine;
using UnityEngine.TestTools;
using UnityEngine.TextCore.Text;
using UnityEngine.UIElements;

namespace Luneraria.UI.Tests
{
    /// <summary>
    /// U3A decision probe: a UI Toolkit panel renders into a texture in batch mode, with the plate
    /// drawing, all glyphs and the three font weights (Regular, Regular with a 0.25 px outline for
    /// the G3 weight 560, Bold). Writes tools/out/ui-spike.png (docs/port/screenshots/u3/00).
    /// </summary>
    public sealed class UiToolkitProbeTests
    {
        sealed class Plate : VisualElement
        {
            readonly LunePlateStyle _style;
            public Plate(LunePlateStyle style)
            {
                _style = style;
                style.ApplyPadding(this);
                generateVisualContent += context => LunePlates.Draw(context, new Rect(0, 0, layout.width, layout.height), _style);
            }
        }

        sealed class Glyph : VisualElement
        {
            public Glyph(string name, Color color, float edge)
            {
                this.style.width = edge;
                this.style.height = edge;
                generateVisualContent += context => LuneGlyphs.Draw(context.painter2D, name, new Rect(0, 0, layout.width, layout.height), color);
            }
        }

        static Label Text(string value, FontAsset font, float size, Color color, float outline = 0f, float spacing = 0f)
        {
            var label = new Label(value);
            label.style.unityFontDefinition = FontDefinition.FromSDFFont(font);
            label.style.fontSize = size;
            label.style.color = color;
            label.style.letterSpacing = spacing;
            label.style.marginLeft = 0;
            label.style.paddingLeft = 0;
            if (outline > 0f)
            {
                label.style.unityTextOutlineWidth = outline;
                label.style.unityTextOutlineColor = color;
            }
            label.style.textShadow = new TextShadow { offset = new Vector2(0f, 1f), blurRadius = 1f, color = new Color(0f, 0f, 0f, .55f) };
            return label;
        }

        [UnityTest]
        public IEnumerator PanelRendersIntoTexture()
        {
#if UNITY_EDITOR
            var assets = UnityEditor.AssetDatabase.LoadAssetAtPath<LuneUiAssets>("Assets/Luneraria/Settings/LuneUi.asset");
#else
            LuneUiAssets assets = null;
#endif
            Assert.IsNotNull(assets);
            var target = new RenderTexture(1920, 1080, 0, RenderTextureFormat.ARGB32);
            var settings = ScriptableObject.CreateInstance<PanelSettings>();
            settings.themeStyleSheet = assets.Theme;
            settings.targetTexture = target;
            settings.scaleMode = PanelScaleMode.ScaleWithScreenSize;
            settings.referenceResolution = new Vector2Int(1600, 960);
            settings.screenMatchMode = PanelScreenMatchMode.Expand;
            settings.clearColor = true;
            settings.colorClearValue = new Color(.28f, .36f, .22f, 1f);
            var host = new GameObject("UiSpike");
            var document = host.AddComponent<UIDocument>();
            document.panelSettings = settings;
            yield return null;
            VisualElement root = document.rootVisualElement;
            var panel = new Plate(LunePlateStyle.Hud(LuneUiTheme.SlateTop, LuneUiTheme.SlateBottom, LuneUiTheme.Edge, 1f, 6f, 12f, 10f));
            panel.style.position = Position.Absolute;
            panel.style.left = 12;
            panel.style.top = 12;
            panel.style.width = 760;
            root.Add(panel);
            panel.Add(Text("WELLE 21", assets.Display, 30, LuneUiTheme.Hex("f4e6c4"), 0f, 3f));
            panel.Add(Text("DEIN ANCIENT · BLAU", assets.TextBold, 14, LuneUiTheme.BronzeLight, 0f, 2f));
            panel.Add(Text("Regular 400: Einheiten mit „Grotte“ entsenden. 12.000 / 12.000", assets.Text, 15, LuneUiTheme.Text));
            panel.Add(Text("Regular + 0,25 Kontur: Einheiten mit „Grotte“ entsenden. 12.000 / 12.000", assets.Text, 15, LuneUiTheme.Text, .25f));
            panel.Add(Text("Regular + 0,45 Kontur: Einheiten mit „Grotte“ entsenden. 12.000 / 12.000", assets.Text, 15, LuneUiTheme.Text, .45f));
            panel.Add(Text("Bold 700: Einheiten mit „Grotte“ entsenden. 12.000 / 12.000", assets.TextBold, 15, LuneUiTheme.Text));
            panel.Add(Text("235", assets.TextBold, 24, LuneUiTheme.Gold));
            var glyphs = new VisualElement();
            glyphs.style.flexDirection = FlexDirection.Row;
            glyphs.style.flexWrap = Wrap.Wrap;
            glyphs.style.marginTop = 8;
            panel.Add(glyphs);
            foreach (string name in LuneGlyphs.Names)
            {
                var glyph = new Glyph(name, name.StartsWith("emblem_1") || name == "shape_1" ? LuneUiTheme.Team[1] : name.StartsWith("emblem_0") || name == "shape_0" ? LuneUiTheme.Team[0] : LuneUiTheme.Text, 28f);
                glyph.style.marginRight = 6;
                glyph.style.marginBottom = 6;
                glyphs.Add(glyph);
            }
            var buttons = new VisualElement();
            buttons.style.flexDirection = FlexDirection.Row;
            panel.Add(buttons);
            var primary = new Plate(LunePlateStyle.Menu(LuneUiTheme.Hex("e8c47e"), LuneUiTheme.Hex("b98a4a"), LuneUiTheme.Hex("fff0cc"), 1.5f, 9f, 30f, 15f));
            primary.Add(Text("BEREIT", assets.Display, 22, LuneUiTheme.Ink, 0f, 2f));
            buttons.Add(primary);
            var card = new Plate(LunePlateStyle.Hud(LuneUiTheme.Hex("19222c"), LuneUiTheme.Hex("10161d"), LuneUiTheme.Hex("34424f"), 1f, 7f, 6f, 6f));
            card.style.width = 116;
            card.style.height = 132;
            card.style.marginLeft = 10;
            buttons.Add(card);
            for (int frame = 0; frame < 6; frame++)
                yield return null;
            RenderTexture.active = target;
            var image = new Texture2D(1920, 1080, TextureFormat.RGBA32, false);
            image.ReadPixels(new Rect(0, 0, 1920, 1080), 0, 0);
            image.Apply();
            RenderTexture.active = null;
            string file = Path.Combine(Path.GetDirectoryName(Application.dataPath), "tools/out/ui-spike.png");
            Directory.CreateDirectory(Path.GetDirectoryName(file));
            File.WriteAllBytes(file, image.EncodeToPNG());
            Color corner = image.GetPixel(1900, 20);
            Color panelPixel = image.GetPixel(100, 1080 - 100);
            Debug.Log("LUNE_SPIKE corner " + corner + " panel " + panelPixel + " layout " + panel.layout);
            Object.Destroy(host);
            Assert.Greater(panel.layout.height, 50f);
        }
    }
}