//
//  EntityCommands.cs
//
//  Copyright (c) František Boháček. All rights reserved.
//  Licensed under the MIT license. See LICENSE file in the project root for full license information.

using NosSmooth.ChatCommands;
using NosSmooth.Extensions.Combat.Errors;
using NosSmooth.Game;
using NosSmooth.LocalBinding.Objects;
using NosSmooth.LocalBinding.Structs;
using Remora.Commands.Attributes;
using Remora.Commands.Groups;
using Remora.Results;

namespace SimplePiiBot.Commands;

/// <summary>
/// Represents command group for combat commands.
/// </summary>
public class EntityCommands : CommandGroup
{
    private readonly Game _game;
    private readonly UnitManagerBinding _unitManagerBinding;
    private readonly SceneManager _sceneManager;
    private readonly PlayerManagerBinding _playerManagerBinding;
    private readonly FeedbackService _feedbackService;

    /// <summary>
    /// Initializes a new instance of the <see cref="EntityCommands"/> class.
    /// </summary>
    /// <param name="game">The game.</param>
    /// <param name="unitManagerBinding">The scene manager binding.</param>
    /// <param name="sceneManager">The scene manager.</param>
    /// <param name="playerManagerBinding">The character binding.</param>
    /// <param name="feedbackService">The feedback service.</param>
    public EntityCommands
    (
        Game game,
        UnitManagerBinding unitManagerBinding,
        SceneManager sceneManager,
        PlayerManagerBinding playerManagerBinding,
        FeedbackService feedbackService
    )
    {
        _game = game;
        _unitManagerBinding = unitManagerBinding;
        _sceneManager = sceneManager;
        _playerManagerBinding = playerManagerBinding;
        _feedbackService = feedbackService;
    }

    /// <summary>
    /// Show close entities.
    /// </summary>
    /// <param name="range">The range to look.</param>
    /// <returns>A task that may or may not have succeeded.</returns>
    [Command("close")]
    public async Task<Result> HandleCloseEntitiesAsync(int range = 10)
    {
        var map = _game.CurrentMap;
        var character = _game.Character;
        if (map is null)
        {
            return new MapNotInitializedError();
        }

        if (character is null)
        {
            return new CharacterNotInitializedError();
        }

        var position = character.Position;
        if (position is null)
        {
            return new CharacterNotInitializedError("Position");
        }

        var entities = map.Entities
            .GetEntities()
            .Where(x => x.Position?.DistanceSquared(position.Value) <= range * range)
            .ToList();

        if (entities.Count == 0)
        {
            await _feedbackService.SendInfoMessageAsync("No entity found.", CancellationToken);
        }

        foreach (var entity in entities)
        {
            await _feedbackService.SendInfoMessageAsync($"Found entity: {entity.Id}", CancellationToken);
        }

        return Result.FromSuccess();
    }

    /// <summary>
    /// Focus the given entity.
    /// </summary>
    /// <param name="entityId">The entity id to focus.</param>
    /// <returns>A task that may or may not have succeeded.</returns>
    [Command("focus")]
    public Task<Result> HandleFocusAsync(int entityId)
    {
        var entityResult = _sceneManager.FindEntity(entityId);
        if (!entityResult.IsSuccess)
        {
            return Task.FromResult(Result.FromError(entityResult));
        }

        return Task.FromResult(_unitManagerBinding.FocusEntity(entityResult.Entity));
    }

    /// <summary>
    /// Follow the given entity.
    /// </summary>
    /// <param name="entityId">The entity id to follow.</param>
    /// <returns>A task that may or may not have succeeded.</returns>
    [Command("follow")]
    public Task<Result> HandleFollowAsync(int entityId)
    {
        var entityResult = _sceneManager.FindEntity(entityId);
        if (!entityResult.IsSuccess)
        {
            return Task.FromResult(Result.FromError(entityResult));
        }

        return Task.FromResult(_playerManagerBinding.FollowEntity(entityResult.Entity));
    }

    /// <summary>
    /// Stop following an entity.
    /// </summary>
    /// <returns>A task that may or may not have succeeded.</returns>
    [Command("unfollow")]
    public Task<Result> HandleUnfollowAsync()
    {
        return Task.FromResult(_playerManagerBinding.UnfollowEntity());
    }
}