using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using WyrmTale;

public class BotWorker : LocalSingletonBehaviour<BotWorker> {
    public enum States {
        Stopped, Working
    }

    public States State {
        get {
            return state;
        }
        set {
            state = value;
            OnStateChanged.Invoke(value);
        }
    }

    public event Action<States> OnStateChanged = delegate { };

    private States state;
    private VkApi vkApi;
    private Dictionary<int,int> lastMessages = new Dictionary<int,int>();

    private readonly static int BOT_ID = -150683496;

    public void Launch (string token) {
        if (vkApi != null) return;

        lastMessages = LastMessagesDataController.I.Load();

        vkApi = VkApi.GetVkApi(token);

        State = States.Working;

        StartCoroutine(WorkingCoroutine());
    }

    public void ShutDown () {
        State = States.Stopped;

        StopAllCoroutines();

        vkApi = null;

        LastMessagesDataController.I.Save(lastMessages);
    }

    public override void DoDestroy () {
        LastMessagesDataController.I.Save(lastMessages);

        base.DoDestroy();
    }

    private IEnumerator WorkingCoroutine () {
        while (State == States.Working) {
            vkApi.GetDialogs(20,OnGetDialogs);
            yield return new WaitForSeconds(7F);
        }
    }

    private void OnGetDialogs (List<JSON> items) {
        foreach (JSON i in items) {
            MessageIsActual(i);
        }
    }

    private void MessageIsActual (JSON item) {
        JSON message = item.ToJSON("message");
        int user_id = message.ToInt("user_id");

        vkApi.GetHistory(user_id,1,MessageIsActualCallback);
    }

    private void MessageIsActualCallback (List<JSON> items) {
        if (items.Count.Equals(0)) return;

        int from_id = items[0].ToInt("from_id");

        if (BOT_ID.Equals(from_id)) return;

        int user_id = items[0].ToInt("user_id");
        int message_id = items[0].ToInt("id");
        string body = items[0].ToString("body");

        HandleMessage(body,user_id,message_id,!lastMessages.ContainsKey(user_id));
    }

    private void HandleMessage (string body,int user_id,int message_id,bool firstMessage = true) {
        if (lastMessages.ContainsKey(user_id)) {
            if (!lastMessages[user_id].Equals(message_id)) {
                if (body.ToLower().Contains("скинь гачимучи")) {
                    vkApi.SendMessageWithVideo(user_id,PhrasesManager.I.GetRandomGachimuchiPhrase(),VideoManager.I.GetRandomGachimuchiRemix(user_id));
                    lastMessages[user_id] = message_id;
                } else {
                    vkApi.SendMessage(user_id,"Напиши мне 'Скинь гачимучи' и я тебе скину годный ремикс");
                    lastMessages[user_id] = message_id;
                }
            }
        } else {
            vkApi.SendMessage(user_id,PhrasesManager.WelcomePhrase);
            lastMessages.Add(user_id,message_id);
        }
    }
}