using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;
using UnityEngine.TextCore.LowLevel;
using UnityEngine.TextCore.Text;
using UnityEngine.UIElements;

namespace Ironspore.Editor
{
    public static class LocalizationBuilder
    {
        public const string CatalogPath = "Assets/Game/Localization/LocalizationCatalog.asset";
        const string FontPath = "Assets/ThirdParty/Adobe/NotoSansSC/NotoSansSC-VF.ttf";
        const string FontAssetPath = "Assets/Game/UI/Fonts/GameFont.asset";

        [MenuItem("Ironspore/Configure Localization")]
        public static string Configure()
        {
            if (EditorApplication.isPlaying)
                throw new InvalidOperationException("Stop play mode before configuring localization.");
            Directory.CreateDirectory("Assets/Game/UI/Fonts");
            AssetDatabase.Refresh();
            var importer = AssetImporter.GetAtPath(FontPath) as TrueTypeFontImporter;
            if (!importer)
                throw new FileNotFoundException("Archived OFL font has not imported.", FontPath);
            importer.fontTextureCase = FontTextureCase.Dynamic;
            importer.fontSize = 40;
            importer.includeFontData = true;
            importer.SaveAndReimport();
            var font = AssetDatabase.LoadAssetAtPath<Font>(FontPath);
            var catalog = AssetDatabase.LoadAssetAtPath<LocalizationCatalog>(CatalogPath);
            if (!catalog)
            {
                catalog = ScriptableObject.CreateInstance<LocalizationCatalog>();
                AssetDatabase.CreateAsset(catalog, CatalogPath);
            }
            catalog.locales = new[]
            {
                new GameLocale { code = "zh-Hans", nativeName = "简体中文", table = AssetDatabase.LoadAssetAtPath<UnityEngine.TextAsset>("Assets/Game/Localization/Tables/zh-Hans.json") },
                new GameLocale { code = "en", nativeName = "English", table = AssetDatabase.LoadAssetAtPath<UnityEngine.TextAsset>("Assets/Game/Localization/Tables/en.json") }
            };
            var uiFont = AssetDatabase.LoadAssetAtPath<FontAsset>(FontAssetPath);
            if (!uiFont)
            {
                uiFont = FontAsset.CreateFontAsset(font, 64, 7, GlyphRenderMode.SDFAA, 2048, 2048, AtlasPopulationMode.Dynamic, true);
                uiFont.name = "GameFont";
                AssetDatabase.CreateAsset(uiFont, FontAssetPath);
                uiFont.material.name = "GameFont Material";
                AssetDatabase.AddObjectToAsset(uiFont.material, uiFont);
            }
            uiFont.isMultiAtlasTexturesEnabled = true;
            var characters = new HashSet<char>(Enumerable.Range(32, 95).Select(x => (char)x));
            foreach (var locale in catalog.locales)
            {
                foreach (char c in locale.nativeName)
                    characters.Add(c);
                foreach (var entry in GameLocalization.ReadTable(locale.table))
                    foreach (char c in entry.Value)
                        if (!char.IsControl(c))
                            characters.Add(c);
            }
            string absent;
            uiFont.TryAddCharacters(new string(characters.OrderBy(x => x).ToArray()), out absent);
            if (!string.IsNullOrEmpty(absent))
                throw new InvalidOperationException("Font is missing required glyphs: " + absent);
            foreach (var atlas in uiFont.atlasTextures)
            {
                if (!atlas || AssetDatabase.Contains(atlas))
                    continue;
                atlas.name = "GameFont Atlas";
                AssetDatabase.AddObjectToAsset(atlas, uiFont);
            }
            EditorUtility.SetDirty(uiFont);
            catalog.worldFont = font;
            catalog.uiFont = uiFont;
            EditorUtility.SetDirty(catalog);
            var textSettings = AssetDatabase.LoadAssetAtPath<PanelTextSettings>("Assets/Game/UI/Fonts/GameTextSettings.asset");
            if (!textSettings)
            {
                textSettings = ScriptableObject.CreateInstance<PanelTextSettings>();
                AssetDatabase.CreateAsset(textSettings, "Assets/Game/UI/Fonts/GameTextSettings.asset");
            }
            textSettings.fallbackFontAssets = new List<FontAsset> { uiFont };
            textSettings.clearDynamicDataOnBuild = false;
            EditorUtility.SetDirty(textSettings);
            var panel = AssetDatabase.LoadAssetAtPath<PanelSettings>("Assets/Game/UI/GamePanelSettings.asset");
            panel.textSettings = textSettings;
            EditorUtility.SetDirty(panel);
            string previousScene = EditorSceneManager.GetActiveScene().path;
            foreach (string name in new[] { "Bootstrap", "MechTestRange", "WarzonePrototype" })
            {
                var scene = EditorSceneManager.OpenScene("Assets/Scenes/" + name + ".unity");
                var session = UnityEngine.Object.FindAnyObjectByType<GameSession>();
                session.localization = catalog;
                EditorUtility.SetDirty(session);
                EditorSceneManager.MarkSceneDirty(scene);
                EditorSceneManager.SaveScene(scene);
            }
            AssetDatabase.SaveAssets();
            EditorSceneManager.OpenScene(string.IsNullOrEmpty(previousScene) ? "Assets/Scenes/Bootstrap.unity" : previousScene);
            return "Configured two locales, " + characters.Count + " glyphs, UI Toolkit and TextMesh fonts, and all three scenes.";
        }
    }
}