using Aurora;
using Aurora.Api;
using Hermes;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace VisionCommon {
    /// <summary>
    /// 현재 실행 중인 SW의 Recipe 구성에 맞게
    /// 장비에 저장된 Recipe 파일을 업데이트 한다.
    /// </summary>
    public static class RecipeUpdater {
        private const string KEY_UNIT_RECIPES = nameof(VisionDef.UnitRecipes);
        private const string KEY_SUB_SYS_RECIPES = nameof(UnitRecipe.SubSysRecipes);
        private const string KEY_FOV_RECIPES = nameof(SubSysRecipe.FovRecipes);
        private const string KEY_ALIGN_RECIPES = nameof(SubSysRecipe.AlignRecipes);

        private static Logger _logger = new Logger(nameof(RecipeUpdater));

        /// <summary>
        /// 레시피 업데이트를 실행한다.
        /// </summary>
        /// <param name="recipeModelType">레시피 또는 모델</param>
        /// <returns>실행 결과</returns>
        public static int Run(eRecipeModelType recipeModelType) {
            var recipeDirectories = RecipeUpdaterUtil.GetDataDirectories(recipeModelType);
            var updaters = GetRecipeUpdaters();

            foreach (var recipeDir in recipeDirectories) {
                var recipeFilePath = Path.Combine(recipeDir, $"{VisionKeys.VisionRecipeKey}.json");

                if (File.Exists(recipeFilePath)) {
                    JToken machineRecipeOriginal = JsonManager.ParseFromFile(recipeFilePath);
                    if (machineRecipeOriginal == null) {
                        _logger.E($"Read recipe file error : {recipeFilePath}");
                        continue;
                    }

                    JToken machineRecipe = machineRecipeOriginal.DeepClone();

                    SetInitialVersion(machineRecipe);
                    var machineRecipeVersion = GetRecipeVersion(machineRecipe);
                    if (!IsUpdatable(machineRecipeVersion)) {
                        continue;
                    }

                    var result = Update(machineRecipe, machineRecipeVersion, VisionDef.RECIPE_VERSION_CURRENT, updaters);
                    if (result == E1.OK) {
                        SaveBackupFile(machineRecipeOriginal, machineRecipeVersion, recipeDir);
                        SaveUpdateFile(machineRecipe, recipeDir);
                    }
                }
            }

            return E1.OK;
        }

        private static List<Updater> GetRecipeUpdaters() {
            var updaters = new List<Updater>();

            Type targetType = typeof(Updater);
            Assembly assembly = Assembly.GetExecutingAssembly();
            var types = assembly.GetTypes();
            foreach (var type in types) {
                if (targetType.IsAssignableFrom(type)) {
                    ConstructorInfo ctor = type.GetConstructor(new Type[] { });
                    if (ctor != null) {
                        updaters.Add((Updater)ctor.Invoke(new object[] { }));
                    }
                }
            }
            return updaters;
        }

        private static void SetInitialVersion(JToken machineRecipe) {
            var machineRecipeVersion = GetRecipeVersion(machineRecipe);
            if (machineRecipeVersion == 0) {
                SetRecipeVersion(machineRecipe, VisionDef.RECIPE_VERSION_INITIAL);
            }
        }

        private static bool IsUpdatable(double machineRecipeVersion) {
            return !MathUtil.Equals(machineRecipeVersion, VisionDef.RECIPE_VERSION_CURRENT, 0.01);
        }

        private static double GetRecipeVersion(JToken machineRecipe) {
            try {
                var versionToken = machineRecipe.SelectToken(nameof(VisionDef.Version));
                if (versionToken != null) {
                    return Math.Round(versionToken.ToObject<double>(), 1);
                }
            }
            catch (Exception e) {
                _logger.E(e.Message);
            }

            return 0;
        }

        private static int SetRecipeVersion(JToken machineRecipe, double version) {
            try {
                var versionToken = machineRecipe.SelectToken(nameof(VisionDef.Version));
                if (versionToken == null) {
                    machineRecipe[nameof(VisionDef.Version)] = version;
                }
                else {
                    versionToken.Replace(new JValue(Math.Round(version, 1)));
                }
            }
            catch (Exception e) {
                _logger.E(e.Message);
                return E1.GENERIC;
            }

            return E1.OK;
        }

        private static int Update(JToken machineRecipe, double machineRecipeVersion, double swVersion, List<Updater> updaters) {
            if (machineRecipeVersion < VisionDef.RECIPE_VERSION_CURRENT) {
                return Upgrade(machineRecipe, machineRecipeVersion, VisionDef.RECIPE_VERSION_CURRENT, updaters);
            }
            else if (VisionDef.RECIPE_VERSION_CURRENT < machineRecipeVersion) {
                return Downgrade(machineRecipe, machineRecipeVersion, VisionDef.RECIPE_VERSION_CURRENT, updaters);
            }

            return E1.GENERIC;
        }

        private static int Upgrade(JToken machineRecipe, double machineRecipeVersion, double swVersion, List<Updater> updaters) {
            for (double curVer = machineRecipeVersion; curVer < swVersion; curVer += 0.1) {
                double nextVer = curVer + 0.1;
                foreach (var updater in updaters) {
                    updater.Update(machineRecipe, curVer, nextVer);
                }
                SetRecipeVersion(machineRecipe, nextVer);
            }

            return E1.OK;
        }

        private static int Downgrade(JToken machineRecipe, double machineRecipeVersion, double swVersion, List<Updater> updaters) {
            for (double curVer = machineRecipeVersion; swVersion < curVer; curVer -= 0.1) {
                double nextVer = curVer - 0.1;
                foreach (var updater in updaters) {
                    updater.Update(machineRecipe, curVer, nextVer);
                }
                SetRecipeVersion(machineRecipe, nextVer);
            }

            return E1.OK;
        }

        private static int SaveBackupFile(
            JToken machineRecipeOriginal, double machineRecipeVersion, string recipeDir) {
            string datetimeStr = DateTime.Now.ToString("yyyyMMdd_hhmmss");
            string backupFileName = $"{VisionKeys.VisionRecipeKey}_{datetimeStr}_v{machineRecipeVersion}.json";

            return JsonManager.SaveToFile(
                machineRecipeOriginal,
                Path.Combine(recipeDir, backupFileName));
        }

        private static int SaveUpdateFile(JToken machineRecipe, string recipeDir) {
            return JsonManager.SaveToFile(
                machineRecipe,
                Path.Combine(recipeDir, $"{VisionKeys.VisionRecipeKey}.json"));
        }
    }
}