using System;
using System.Linq;
using StardewModdingAPI.Mods.ConsoleCommands.Framework.ItemData;
using StardewValley;
using Object = StardewValley.Object;

namespace StardewModdingAPI.Mods.ConsoleCommands.Framework.Commands.Player
{
    /// <summary>A command which adds an item to the player inventory.</summary>
    internal class AddCommand : TrainerCommand
    {
        /*********
        ** Fields
        *********/
        /// <summary>Provides methods for searching and constructing items.</summary>
        private readonly ItemRepository Items = new ItemRepository();

        /// <summary>The type names recognized by this command.</summary>
        private readonly string[] ValidTypes = Enum.GetNames(typeof(ItemType)).Concat(new[] { "Name" }).ToArray();


        /*********
        ** Public methods
        *********/
        /// <summary>Construct an instance.</summary>
        public AddCommand()
            : base("player_add", AddCommand.GetDescription()) { }

        /// <summary>Handle the command.</summary>
        /// <param name="monitor">Writes messages to the console and log file.</param>
        /// <param name="command">The command name.</param>
        /// <param name="args">The command arguments.</param>
        public override void Handle(IMonitor monitor, string command, ArgumentParser args)
        {
            // validate
            if (!Context.IsWorldReady)
            {
                monitor.Log("You need to load a save to use this command.", LogLevel.Error);
                return;
            }

            // read arguments
            if (!args.TryGet(0, "item type", out string type, oneOf: this.ValidTypes))
                return;
            if (!args.TryGetInt(2, "count", out int count, min: 1, required: false))
                count = 1;
            if (!args.TryGetInt(3, "quality", out int quality, min: Object.lowQuality, max: Object.bestQuality, required: false))
                quality = Object.lowQuality;

            // find matching item
            SearchableItem match = Enum.TryParse(type, true, out ItemType itemType)
                ? this.FindItemByID(monitor, args, itemType)
                : this.FindItemByName(monitor, args);
            if (match == null)
                return;

            // apply count
            match.Item.Stack = count;

            // apply quality
            if (match.Item is Object obj)
                obj.Quality = quality;
            else if (match.Item is Tool tool)
                tool.UpgradeLevel = quality;

            // add to inventory
            Game1.player.addItemByMenuIfNecessary(match.Item);
            monitor.Log($"OK, added {match.Name} ({match.Type} #{match.ID}) to your inventory.", LogLevel.Info);
        }


        /*********
        ** Private methods
        *********/
        /// <summary>Get a matching item by its ID.</summary>
        /// <param name="monitor">Writes messages to the console and log file.</param>
        /// <param name="args">The command arguments.</param>
        /// <param name="type">The item type.</param>
        private SearchableItem FindItemByID(IMonitor monitor, ArgumentParser args, ItemType type)
        {
            // read arguments
            if (!args.TryGetInt(1, "item ID", out int id, min: 0))
                return null;

            // find matching item
            SearchableItem item = this.Items.GetAll().FirstOrDefault(p => p.Type == type && p.ID == id);
            if (item == null)
                monitor.Log($"There's no {type} item with ID {id}.", LogLevel.Error);
            return item;
        }

        /// <summary>Get a matching item by its name.</summary>
        /// <param name="monitor">Writes messages to the console and log file.</param>
        /// <param name="args">The command arguments.</param>
        private SearchableItem FindItemByName(IMonitor monitor, ArgumentParser args)
        {
            // read arguments
            if (!args.TryGet(1, "item name", out string name))
                return null;

            // find matching items
            SearchableItem[] matches = this.Items.GetAll().Where(p => p.NameContains(name)).ToArray();
            if (!matches.Any())
            {
                monitor.Log($"There's no item with name '{name}'. You can use the 'list_items [name]' command to search for items.", LogLevel.Error);
                return null;
            }

            // handle single exact match
            SearchableItem[] exactMatches = matches.Where(p => p.NameEquivalentTo(name)).ToArray();
            if (exactMatches.Length == 1)
                return exactMatches[0];

            // handle ambiguous results
            string options = this.GetTableString(
                data: matches,
                header: new[] { "type", "name", "command" },
                getRow: item => new[] { item.Type.ToString(), item.DisplayName, $"player_add {item.Type} {item.ID}" }
            );
            monitor.Log($"There's no item with name '{name}'. Do you mean one of these?\n\n{options}", LogLevel.Info);
            return null;
        }

        /// <summary>Get the command description.</summary>
        private static string GetDescription()
        {
            string[] typeValues = Enum.GetNames(typeof(ItemType));
            return "Gives the player an item.\n"
                + "\n"
                + "Usage: player_add <type> <item> [count] [quality]\n"
                + $"- type: the item type (one of {string.Join(", ", typeValues)}).\n"
                + "- item: the item ID (use the 'list_items' command to see a list).\n"
                + "- count (optional): how many of the item to give.\n"
                + $"- quality (optional): one of {Object.lowQuality} (normal), {Object.medQuality} (silver), {Object.highQuality} (gold), or {Object.bestQuality} (iridium).\n"
                + "\n"
                + "Usage: player_add name \"<name>\" [count] [quality]\n"
                + "- name: the item name to search (use the 'list_items' command to see a list). This will add the item immediately if it's an exact match, else show a table of matching items.\n"
                + "- count (optional): how many of the item to give.\n"
                + $"- quality (optional): one of {Object.lowQuality} (normal), {Object.medQuality} (silver), {Object.highQuality} (gold), or {Object.bestQuality} (iridium).\n"
                + "\n"
                + "These examples both add the galaxy sword to your inventory:\n"
                + "  player_add weapon 4\n"
                + "  player_add name \"Galaxy Sword\"";
        }
    }
}