using Gs2.Unity.Util;
using System;
using System.Threading.Tasks;
using UnityEngine;
using GS2Studio.Generated.Quest;
using GS2Studio.Generated.Progress;
using GS2Studio.Generated.Wallet;
using GS2Studio.Generated.Energy;

public sealed class AdventureStudioView : MonoBehaviour
{
    [SerializeField] private QuestListHandler quests;
    private bool busy;
    private bool unresolved;
    private string message = "";
    [SerializeField] private ProgressHandler progress;
    [SerializeField] private WalletHandler wallet;
    [SerializeField] private EnergyHandler energy;

    private void OnEnable()
    {
        if (quests != null) quests.Failed += ShowLoadError;
        if (progress != null) progress.Failed += ShowLoadError;
        if (wallet != null) wallet.Failed += ShowLoadError;
        if (energy != null) energy.Failed += ShowLoadError;
    }

    private void OnDisable()
    {
        if (quests != null) quests.Failed -= ShowLoadError;
        if (progress != null) progress.Failed -= ShowLoadError;
        if (wallet != null) wallet.Failed -= ShowLoadError;
        if (energy != null) energy.Failed -= ShowLoadError;
    }

    private void ShowLoadError(Exception error)
    {
        message = "불러오지 못했습니다: " + error.GetType().Name;
    }

    private void OnGUI()
    {
        var sessionHolder = Gs2GameSessionHolder.Instance;
        if (quests == null || sessionHolder == null || !sessionHolder.Initialized)
        {
            return;
        }

        GUILayout.BeginArea(new Rect(20, 100, 650, 650), GUI.skin.box);
        GUILayout.Label(message);

        if (quests.IsLoaded)
        {
            DrawQuestButtons();
            DrawPlayerStatus();
            DrawShop();
        }
        else
        {
            GUILayout.Label("모험 로딩 중");
        }

        GUI.enabled = true;
        GUILayout.EndArea();
    }

    private void DrawQuestButtons()
    {
        var canOperate = !busy && !unresolved && progress.HasValue;

        GUI.enabled = canOperate && !progress.Model.InProgress;
        foreach (var quest in quests.Binders)
        {
            GUILayout.Label(quest.DisplayName);
            if (GUILayout.Button("시작: " + quest.DisplayName))
            {
                Run(() => quest.Start());
            }
        }

        GUI.enabled = canOperate && progress.Model.InProgress;
        if (GUILayout.Button("클리어"))
        {
            Run(() => progress.Binder.Complete());
        }
        GUI.enabled = true;
    }

    private void DrawPlayerStatus()
    {
        GUILayout.Label(wallet.HasValue
            ? "코인: " + wallet.Model.Free
            : "코인 로딩 중");

        if (!progress.HasValue)
        {
            GUILayout.Label("진행 상황 로딩 중");
        }
        else
        {
            GUILayout.Label(progress.Model.InProgress
                ? "모험 진행 중"
                : "모험을 선택하세요");
        }

        GUILayout.Label(energy.HasValue
            ? "스태미나: " + energy.Model.CurrentValue
            : "스태미나 로딩 중");
    }

    private void DrawShop()
    {
        GUI.enabled = !busy && !unresolved;
        if (GUILayout.Button("20코인으로 스태미나 10 회복"))
        {
            Run(Buy);
        }
        GUI.enabled = true;
    }

    private async void Run(Func<Task> operation)
    {
        if (busy || unresolved) return;
        busy = true;
        unresolved = true;
        message = "처리 중";
        try
        {
            await operation();
            unresolved = false;
            message = "작업이 완료되었습니다";
        }
        catch (Exception error)
        {
            if (error is Gs2.Gs2Stamina.Exception.InsufficientException ||
                          error is Gs2.Gs2Money2.Exception.InsufficientException)
            {
                unresolved = false;
                message = error is Gs2.Gs2Stamina.Exception.InsufficientException
                    ? "스태미나가 부족합니다. 회복한 뒤 다시 시도하세요"
                    : "코인이 부족합니다. 모험에서 모은 뒤 다시 시도하세요";
            }
            else message = "결과를 확인할 수 없어 새 작업을 중지했습니다: " + error.GetType().Name;
        }
        finally { busy = false; }
    }

    private async Task Buy()
    {
        var request = Gs2ClientHolder.Instance.Gs2.Exchange.Namespace("EnergyProduct")
            .Me(Gs2GameSessionHolder.Instance.GameSession).Exchange();
        var transaction = await request.ExchangeAsync("refill", 1, speculativeExecute: false);
        if (transaction != null) await transaction.WaitAsync(all: true);
    }
}