using HarmonyLib;
using OWML.Common;
using OWML.ModHelper;
using UnityEngine;

namespace SlovakTranslation
{
    /// <summary>
    /// Registers Slovenčina as a selectable language via xen-42's Localization
    /// Utility (xen.LocalizationUtility). All the heavy lifting lives in the
    /// utility; this mod just points it at our translated strings and patches the
    /// few menu/HUD fonts that were never baked with Slovak glyphs (see
    /// <see cref="SlovakFont"/>).
    /// </summary>
    public class SlovakTranslation : ModBehaviour
    {
        public static SlovakTranslation Instance;

        /// <summary>Name the language is registered (and displayed) under.</summary>
        public const string LanguageName = "Slovenčina";

        /// <summary>Path (relative to the mod folder) to the translated strings.</summary>
        public static string translationFile = "assets/Translation.xml";

        /// <summary>The Localization Utility's API, kept for reflection in <see cref="SlovakFont"/>.</summary>
        internal static ILocalizationAPI LocalizationApi;

        private void Start()
        {
            Instance = this;

            LocalizationApi = ModHelper.Interaction.TryGetModApi<ILocalizationAPI>("xen.LocalizationUtility");
            if (LocalizationApi == null)
            {
                ModHelper.Console.WriteLine(
                    "Could not find xen.LocalizationUtility — is Interplanetary Polyglot installed?",
                    MessageType.Error);
                return;
            }

            LocalizationApi.RegisterLanguage(this, LanguageName, translationFile);
            ModHelper.Console.WriteLine("Registered language: " + LanguageName, MessageType.Success);

            // Deliberately *not* AddLanguageFont: that would make IsLanguageLatin false
            // and pull dialogue, the translator and the ship log off their correct
            // vanilla fonts. We only patch the fonts that can't draw Slovak.
            SlovakFont.Load(this);
            if (SlovakFont.Loaded)
            {
                new Harmony("Homer.SlovakTranslation").PatchAll();
                UnityEngine.SceneManagement.SceneManager.sceneLoaded += (scene, mode) => SlovakFont.ApplyToAll();
                ModHelper.Console.WriteLine("Slovak menu/HUD font (Cabin) loaded and patched in.", MessageType.Success);
            }
        }

        /// <summary>
        /// <c>preferGameTypeface</c> — when on, a menu font that can't draw Slovak is
        /// replaced by the game's own dynamic cut of the same typeface where one exists,
        /// so the menu keeps its vanilla look. Turn it off to use the bundled Cabin
        /// everywhere instead.
        /// </summary>
        public override void Configure(IModConfig config)
        {
            SlovakFont.PreferGameTypeface = config.GetSettingsValue<bool>("preferGameTypeface");
            if (!SlovakFont.Loaded) return;

            SlovakFont.ForgetChoices();
            SlovakFont.ApplyToAll();
        }

        /// <summary>Labels can be built long after a scene loads, so keep sweeping.</summary>
        private float _nextSweep;

        private void Update()
        {
            if (!SlovakFont.Loaded || Time.unscaledTime < _nextSweep) return;
            _nextSweep = Time.unscaledTime + 2f;
            SlovakFont.ApplyToAll();
        }
    }
}