using System;
using System.Reflection;
using StardewModdingAPI.Events;
using StardewModdingAPI.Internal.Patching;
using StardewModdingAPI.Mods.ErrorHandler.Patches;
using StardewValley;

namespace StardewModdingAPI.Mods.ErrorHandler
{
    /// <summary>The main entry point for the mod.</summary>
    public class ModEntry : Mod
    {
        /*********
        ** Private methods
        *********/
        /// <summary>Whether custom content was removed from the save data to avoid a crash.</summary>
        private bool IsSaveContentRemoved;


        /*********
        ** Public methods
        *********/
        /// <summary>The mod entry point, called after the mod is first loaded.</summary>
        /// <param name="helper">Provides simplified APIs for writing mods.</param>
        public override void Entry(IModHelper helper)
        {
            // get SMAPI core types
            IMonitor monitorForGame = this.GetMonitorForGame();

            // apply patches
            HarmonyPatcher.Apply(this.ModManifest.UniqueID, this.Monitor,
                new DialoguePatcher(monitorForGame, this.Helper.Reflection),
                new DictionaryPatcher(this.Helper.Reflection),
                new EventPatcher(monitorForGame),
                new GameLocationPatcher(monitorForGame),
                new IClickableMenuPatcher(),
                new NpcPatcher(monitorForGame),
                new ObjectPatcher(),
                new SaveGamePatcher(this.Monitor, this.OnSaveContentRemoved),
                new SpriteBatchPatcher(),
                new UtilityPatcher()
            );

            // hook events
            this.Helper.Events.GameLoop.SaveLoaded += this.OnSaveLoaded;
        }


        /*********
        ** Private methods
        *********/
        /// <summary>Raised after custom content is removed from the save data to avoid a crash.</summary>
        internal void OnSaveContentRemoved()
        {
            this.IsSaveContentRemoved = true;
        }

        /// <summary>The method invoked when a save is loaded.</summary>
        /// <param name="sender">The event sender.</param>
        /// <param name="e">The event arguments.</param>
        private void OnSaveLoaded(object sender, SaveLoadedEventArgs e)
        {
            // show in-game warning for removed save content
            if (this.IsSaveContentRemoved)
            {
                this.IsSaveContentRemoved = false;
                Game1.addHUDMessage(new HUDMessage(this.Helper.Translation.Get("warn.invalid-content-removed"), HUDMessage.error_type));
            }
        }

        /// <summary>Get the monitor with which to log game errors.</summary>
        private IMonitor GetMonitorForGame()
        {
            // get SMAPI core
            Type coreType = Type.GetType("StardewModdingAPI.Framework.SCore, StardewModdingAPI", throwOnError: false)
                ?? throw new InvalidOperationException("Can't access SMAPI's core type. This mod may not work correctly.");
            object core = coreType.GetProperty("Instance", BindingFlags.Static | BindingFlags.NonPublic)?.GetValue(null)
                ?? throw new InvalidOperationException("Can't access SMAPI's core instance. This mod may not work correctly.");

            // get monitor
            MethodInfo getMonitorForGame = coreType.GetMethod("GetMonitorForGame")
                ?? throw new InvalidOperationException("Can't access the SMAPI's 'GetMonitorForGame' method. This mod may not work correctly.");

            return (IMonitor)getMonitorForGame.Invoke(core, new object[0]) ?? this.Monitor;
        }
    }
}