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 string purchaseId;
    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 = "読み込めませんでした: " + 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("冒険を読み込み中です");
        }

        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("開始: " + quest.DisplayName))
            {
                Run(() => quest.Start());
            }
        }

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

    private void DrawPlayerStatus()
    {
        GUILayout.Label(wallet.HasValue
            ? "コイン: " + wallet.Model.Free
            : "コインを読み込み中です");

        if (!progress.HasValue)
        {
            GUILayout.Label("進行を読み込み中です");
        }
        else
        {
            GUILayout.Label(progress.Model.InProgress
                ? "冒険中です"
                : "冒険を選んでください");
        }

        GUILayout.Label(energy.HasValue
            ? "スタミナ: " + energy.Model.CurrentValue
            : "スタミナを読み込み中です");
    }

    private void DrawShop()
    {
        GUI.enabled = !busy && (!unresolved || purchaseId != null);
        if (GUILayout.Button(purchaseId == null ? "20 コインでスタミナを 10 回復" : "同じ購入を再試行"))
        {
            Run(Buy, retryPurchase: purchaseId != null);
        }
        GUI.enabled = true;
    }

    private async void Run(Func<Task> operation, bool retryPurchase = false)
    {
        if (busy || (unresolved && !retryPurchase)) return;
        busy = true;
        unresolved = true;
        message = "処理中です";
        try
        {
            await operation();
            unresolved = false;
            message = "操作が完了しました";
        }
        catch (Gs2.Core.Exception.BadRequestException error) when (
            error.Errors?.Length == 1 &&
            error.Errors[0].Message == "quest.questModel.schedule.error.notInSchedule")
        {
            unresolved = false;
            message = "開催期間外です";
        }
        catch (Exception error)
        {
            if (error is Gs2.Gs2Stamina.Exception.InsufficientException ||
                          error is Gs2.Gs2Money2.Exception.InsufficientException)
            {
                unresolved = false;
                purchaseId = null;
                message = error is Gs2.Gs2Stamina.Exception.InsufficientException
                    ? "スタミナが足りません。回復してからもう一度試してください"
                    : "コインが足りません。冒険で集めてからもう一度試してください";
            }
            else message = purchaseId != null
                ? "通信を確認して、同じ購入を再試行してください: " + error.GetType().Name
                : "結果を確認できません。新しい操作は停止しています: " + error.GetType().Name;
        }
        finally { busy = false; }
    }

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