using System;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using NUnit.Framework;
using UnityEditor;
using UnityEngine;

namespace Ironspore.Tests
{
    public sealed class LocalizationTests
    {
        LocalizationCatalog catalog;
        bool hadPreference;
        string preference;
        [SetUp]
        public void Setup()
        {
            hadPreference = PlayerPrefs.HasKey(GameLocalization.PreferenceKey);
            preference = PlayerPrefs.GetString(GameLocalization.PreferenceKey, "");
            catalog = AssetDatabase.LoadAssetAtPath<LocalizationCatalog>("Assets/Game/Localization/LocalizationCatalog.asset");
            Assert.IsNotNull(catalog, "Run Ironspore/Configure Localization first.");
            GameLocalization.Initialize(catalog);
        }
        [TearDown]
        public void Cleanup()
        {
            if (hadPreference)
                PlayerPrefs.SetString(GameLocalization.PreferenceKey, preference);
            else
                PlayerPrefs.DeleteKey(GameLocalization.PreferenceKey);
            if (catalog)
                GameLocalization.Initialize(catalog);
            PlayerPrefs.Save();
        }
        [TestCase("en", "zh-CN", "en")]
        [TestCase("zh-Hans", "en-US", "zh-Hans")]
        [TestCase("", "zh-TW", "zh-Hans")]
        [TestCase("", "en-GB", "en")]
        [TestCase("obsolete", "zh-HK", "zh-Hans")]
        [TestCase("", "ja-JP", "en")]
        [TestCase(null, null, "en")]
        public void SavedSystemAndFallbackPriority(string saved, string system, string expected)
        {
            Assert.AreEqual(expected, GameLocalization.ResolveInitialLocale(saved, system));
        }
        [Test]
        public void AdditionalLocalesCanUseTheSameSelector()
        {
            Assert.AreEqual("fr", GameLocalization.ResolveInitialLocale("fr", "en-US", new[] { "en", "zh-Hans", "fr" }));
            Assert.AreEqual("fr", GameLocalization.ResolveInitialLocale("", "fr-CA", new[] { "en", "fr" }));
        }
        [Test]
        public void EveryKeyAndFormatArgumentMatchesAndRequiredGlyphsExist()
        {
            var english = GameLocalization.ReadTable(catalog.locales.Single(x => x.code == "en").table);
            foreach (var locale in catalog.locales)
            {
                var translated = GameLocalization.ReadTable(locale.table);
                CollectionAssert.AreEquivalent(english.Keys, translated.Keys, locale.code);
                foreach (var entry in translated)
                {
                    var pattern = @"\{(\d+)(?:[^}]*)\}";
                    string[] expected = Regex.Matches(english[entry.Key], pattern).Cast<Match>().Select(x => x.Groups[1].Value).ToArray();
                    string[] actual = Regex.Matches(entry.Value, pattern).Cast<Match>().Select(x => x.Groups[1].Value).ToArray();
                    CollectionAssert.AreEquivalent(expected, actual, locale.code + ":" + entry.Key);
                    int count = expected.Length == 0 ? 0 : expected.Select(int.Parse).Max() + 1;
                    Assert.DoesNotThrow(() => string.Format(entry.Value, Enumerable.Repeat<object>("sample", count).ToArray()), entry.Key);
                    foreach (char character in entry.Value.Where(c => !char.IsControl(c)))
                        // Dynamic atlases are cleared on build; verify that the source font can supply each glyph.
                        Assert.IsTrue(catalog.uiFont.HasCharacter(character, false, true), "Missing glyph: " + character + " in " + entry.Key);
                }
            }
        }
        [Test]
        public void SelectionPersistsAndInvalidSelectionDoesNotChangePreference()
        {
            Assert.IsTrue(GameLocalization.SelectLocale("zh-Hans"));
            GameLocalization.Initialize(catalog);
            Assert.AreEqual("zh-Hans", GameLocalization.CurrentCode);
            Assert.IsFalse(GameLocalization.SelectLocale("unavailable"));
            Assert.AreEqual("zh-Hans", PlayerPrefs.GetString(GameLocalization.PreferenceKey));
            Assert.IsTrue(GameLocalization.SelectLocale("en"));
            GameLocalization.Initialize(catalog);
            Assert.AreEqual("en", GameLocalization.CurrentCode);
        }
        [Test]
        public void ExistingMessagesAndNamesReformatWithoutMutatingSaveOrIdentifiers()
        {
            var state = new GameSave();
            state.run.cargo.Add(new CargoStack("blueprint_coil_capacitor", 1));
            string before = JsonUtility.ToJson(state);
            var notice = GameLocalization.Message("notice.recovered", GameLocalization.Message("item.blueprint_coil_capacitor"), 3);
            GameLocalization.SelectLocale("en", false);
            StringAssert.Contains("COIL CAPACITOR", notice.ToString());
            GameLocalization.SelectLocale("zh-Hans", false);
            StringAssert.Contains("电磁电容", notice.ToString());
            StringAssert.Contains("×3", notice.ToString());
            StringAssert.Contains("电磁电容", state.run.cargo[0].Name);
            Assert.AreEqual(before, JsonUtility.ToJson(state));
            Assert.AreEqual(GameSave.CurrentVersion, state.version);
        }
        [Test]
        public void MissingTranslationUsesEnglishFallback()
        {
            var temporary = ScriptableObject.CreateInstance<LocalizationCatalog>();
            var english = new UnityEngine.TextAsset("{\"entries\":[{\"key\":\"test.fallback\",\"value\":\"Readable English {0}\"}]}");
            var chinese = new UnityEngine.TextAsset("{\"entries\":[]}");
            try
            {
                temporary.locales = new[] { new GameLocale { code = "en", table = english }, new GameLocale { code = "zh-Hans", table = chinese } };
                GameLocalization.Initialize(temporary);
                GameLocalization.SelectLocale("zh-Hans", false);
                Assert.AreEqual("Readable English 7", GameLocalization.Text("test.fallback", 7));
            }
            finally
            {
                UnityEngine.Object.DestroyImmediate(temporary);
                UnityEngine.Object.DestroyImmediate(english);
                UnityEngine.Object.DestroyImmediate(chinese);
            }
        }
        [Test]
        public void DuplicateKeysAreRejected()
        {
            var table = new UnityEngine.TextAsset("{\"entries\":[{\"key\":\"same\",\"value\":\"one\"},{\"key\":\"same\",\"value\":\"two\"}]}");
            try
            {
                Assert.Throws<ArgumentException>(() => GameLocalization.ReadTable(table));
            }
            finally { UnityEngine.Object.DestroyImmediate(table); }
        }
    }
}