using System;
using System.Collections.Generic;
using System.Linq;
using Game.Features.Console.Contracts;
using Game.Features.Items.Contracts;

namespace Game.Features.Console.Application.Commands;

public sealed class SpawnItemCommand : ICommand
{
    private readonly IItemSpawner _spawner;
    private readonly IItemSpawnPoint _spawnPoint;

    public string Name => "spawn_item";
    public string Description => "Spawns an item in front of the player.";
    public IReadOnlyList<CommandArgSpec> Args { get; }

    public SpawnItemCommand(IItemSpawner spawner, IItemSpawnPoint spawnPoint)
    {
        _spawner = spawner;
        _spawnPoint = spawnPoint;

        string[] definitions = spawner.DefinitionIds
            .Select(id => id.Value)
            .OrderBy(id => id, StringComparer.Ordinal)
            .ToArray();

        Args = new CommandArgsBuilder().AddChoiceArg("item", definitions).Build();
    }

    public CommandResult Execute(CommandArgValues args)
    {
        ItemDefinitionId definitionId = new(args.GetString(0));
        ItemActionResult result = _spawner.TrySpawn(
            definitionId,
            _spawnPoint.GetItemSpawnPosition(),
            out ItemInstanceId itemId
        );

        return result.Success
            ? CommandResult.Ok($"Spawned {definitionId} ({itemId}).")
            : CommandResult.Fail(result.Message);
    }
}