using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.SceneManagement;
using Vanguard.Api.Contracts;
using Vanguard.Battle;

namespace Vanguard.App
{
    /// <summary>
    /// Переходы между сценами-экранами. Boot и VanguardApp остаются
    /// персистентными; данные перехода (выбранная колода, тикет) временно
    /// лежат здесь и забираются целевой сценой.
    /// </summary>
    public sealed class SceneFlow
    {
        public const string Boot = "Boot";
        public const string Login = "Login";
        public const string Lobby = "Lobby";
        public const string Community = "Community";
        public const string DeckBuilder = "DeckBuilder";
        public const string Battle = "Battle";
        public const string PlaymatSandbox = "GameBoard3D";

        public DeckDto PendingQueueDeck { get; private set; }
        public MatchConnectionInfo PendingMatch { get; private set; }

        public Task LoadLoginAsync()
        {
            PendingQueueDeck = null;
            PendingMatch = null;
            return LoadAsync(Login);
        }

        public Task LoadLobbyAsync() => LoadAsync(Lobby);

        public Task LoadCommunityAsync() => LoadAsync(Community);

        public Task LoadDeckBuilderAsync() => LoadAsync(DeckBuilder);

        public Task OpenLobbyWithQueueAsync(DeckDto deck)
        {
            PendingQueueDeck = deck;
            return LoadAsync(Lobby);
        }

        public Task LoadBattleAsync(MatchConnectionInfo info)
        {
            PendingMatch = info;
            return LoadAsync(Battle);
        }

        public DeckDto ConsumePendingQueueDeck()
        {
            var deck = PendingQueueDeck;
            PendingQueueDeck = null;
            return deck;
        }

        public MatchConnectionInfo ConsumePendingMatch()
        {
            var match = PendingMatch;
            PendingMatch = null;
            return match;
        }

        public async Task LoadAsync(string sceneName)
        {
            if (string.IsNullOrEmpty(sceneName))
                return;

            if (SceneManager.GetActiveScene().name == sceneName)
                return;

            var operation = SceneManager.LoadSceneAsync(sceneName, LoadSceneMode.Single);
            if (operation == null)
            {
                Debug.LogError("Сцена не добавлена в Build Settings: " + sceneName);
                return;
            }

            while (!operation.isDone)
                await Task.Yield();
        }
    }
}