using System;
using System.Collections;
using System.Collections.Generic;
using ExitGames.Client.Photon.StructWrapping;
using Photon.Pun;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

public class FriendsManager : MonoBehaviour
{
    CanvasGroup canvasGroup;
    [SerializeField]private GameObject mainPanel;
    [SerializeField]private GameObject AddFriendPanel;
    [Header("Friend list")]
    [SerializeField]private GameObject FriendReqListItemPrefab;
    [SerializeField]private GameObject FriendListItemPrefab;
    [SerializeField]private GameObject SeperatorListItemPrefab;
    [SerializeField]private Transform FriendsListParent;
    [SerializeField]private Button ToggleRequestsButton;


    [Header("Add Friend")]
    [SerializeField]private TMP_InputField AddFriendUsernameInput;
    [SerializeField]private TMP_Text AddFriendErrorTxt;
    [SerializeField]private Button AddFriendBtn;


    public static FriendsManager instance;
    void Awake(){
        instance = this;
        canvasGroup = GetComponent<CanvasGroup>();

        AddFriendBtn.onClick.AddListener(AddFriend);
        ToggleRequestsButton.onClick.AddListener(ToggleRequests);

        Hide();
    }
    public bool showRequests => ToggleRequestsButton.GetComponentInChildren<TMP_Text>().text == "Hide Requests";    
    void ToggleRequests(){
        if(showRequests){
            ToggleRequestsButton.GetComponentInChildren<TMP_Text>().text = "Show Requests";
        }else{
            ToggleRequestsButton.GetComponentInChildren<TMP_Text>().text = "Hide Requests";
        }

        PopulateFriendList();
    }

    void Start(){
        UserDataManager.instance.OnFriendsUpdated = PopulateFriendList;
    }

    public void AddFriend(){
        if(AddFriendUsernameInput.text.Length <= 0){
            AddFriendErrorTxt.text = "Please enter a valid username";
            return;
        }

        StartCoroutine(CoroutineAddFriend(AddFriendUsernameInput.text));
        AddFriendUsernameInput.text = "";
    }

    public void OnPlayersChanged(){
        PopulateFriendList();
    }
   
    void PopulateFriendList(){
        foreach(Photon.Realtime.Player player in PhotonNetwork.PlayerList){
            Debug.Log(player.NickName);
        }

        foreach(Transform t in FriendsListParent.GetComponentsInChildren<Transform>()){
            if(t== FriendsListParent){continue;}
            Destroy(t.gameObject);
        }
        if(showRequests){
            for(int i=0; i < UserDataManager.instance.FriendRequests.Count; i++){
                Friendship friendship = UserDataManager.instance.FriendRequests[i];
                if(friendship.provider_username == UserDataManager.instance.Username){continue;}
                GameObject newFriendReqListItem = Instantiate(FriendReqListItemPrefab, FriendsListParent);
                newFriendReqListItem.GetComponentInChildren<TMP_Text>().text = friendship.provider_username;
                newFriendReqListItem.transform.GetChild(1).GetComponent<Button>().onClick.AddListener(()=>{ UserDataManager.instance.AcceptFriendRequest(friendship.id);});
                newFriendReqListItem.transform.GetChild(2).GetComponent<Button>().onClick.AddListener(()=>{ UserDataManager.instance.AcceptFriendRequest(friendship.id,true);});
            }

            Instantiate(SeperatorListItemPrefab, FriendsListParent);
        }

        for(int i=0; i < UserDataManager.instance.Friends.Count; i++){
            GameObject newFriendListItem = Instantiate(FriendListItemPrefab, FriendsListParent);
            Friendship friendship = UserDataManager.instance.Friends[i];
            string friendName =  friendship.provider_username == UserDataManager.instance.Username ? friendship.receiver_username: friendship.provider_username;
            int fid = friendship.provider_username == UserDataManager.instance.Username ? friendship.receiver_id : friendship.provider_id;
            newFriendListItem.transform.GetChild(0).GetComponent<TMP_Text>().text = friendName;
            
            TimeSpan last_seen_diff = friendship.now - (UserDataManager.instance.Username == friendship.provider_username ? friendship.receiver_last_seen :friendship.provider_last_seen);
            bool isOnline =last_seen_diff < new TimeSpan(0,0,15);
            newFriendListItem.GetComponent<Image>().color = isOnline ? Color.green : Color.gray;
            
            newFriendListItem.transform.GetChild(1).gameObject.SetActive(isOnline);
            newFriendListItem.transform.GetChild(1).GetComponent<Button>().onClick.AddListener(()=>{StartCoroutine(CoroutineInviteFriend(fid));});

            newFriendListItem.transform.GetChild(1).GetComponent<Button>().interactable = PhotonNetwork.CurrentRoom.PlayerCount < 3;

            newFriendListItem.transform.GetChild(2).gameObject.SetActive(!isOnline);
            newFriendListItem.transform.GetChild(2).GetComponent<TMP_Text>().text =  "Last seen " + (last_seen_diff.Hours <=0 ? $"{(last_seen_diff.Minutes == 0 ? 1 : last_seen_diff.Minutes)} Mins" : $"{last_seen_diff.Hours} hours") + " Ago";
        }
        // Photon
    }

    IEnumerator CoroutineAddFriend(string friendUsername){
        canvasGroup.interactable= false;
        
        WWWForm form = new WWWForm();
        form.AddField("uid", UserDataManager.instance.UserID);
        form.AddField("friend_username", friendUsername);

        WWW req= new(UserDataManager.GetApiUrl("friend_request"), form);
        yield return req;
        string pureq =  req.text.Replace(" ", "");
        if(pureq == "0" || pureq == "1"){
            //Success
            AddFriendPanel.SetActive(false);
            mainPanel.SetActive(true);
        }else if(pureq == "7"){
            AddFriendErrorTxt.text ="Invalid username";
        }else if(pureq == "5"){
            AddFriendErrorTxt.text ="You guys are already friends!";
        }else if(pureq == "4"){
            AddFriendErrorTxt.text ="You've already sent a friend request to this user";
        }else{
            AddFriendErrorTxt.text ="Something went wrong";
        }

        if(req.text.Length <=0){
            AddFriendErrorTxt.text ="Server 500";
        }

        canvasGroup.interactable = true;
    }

    IEnumerator CoroutineInviteFriend(int fid){
        canvasGroup.interactable=false;

        WWWForm form = new WWWForm();
        form.AddField("uid", UserDataManager.instance.UserID);
        form.AddField("fid", fid);
        form.AddField("lobby", PhotonNetwork.CurrentRoom.Name);
        Debug.Log("inviting " + fid + " to this session");
        WWW req = new WWW(UserDataManager.GetApiUrl("invite_lobby"),form);
        yield return req;

        canvasGroup.interactable=true;
        Debug.Log("Invite response: " + req.text);
    }

    public void Show(){
        canvasGroup.alpha= 1;
        canvasGroup.blocksRaycasts = true;
        canvasGroup.interactable=true;
        UserDataManager.instance.RefreshFriends();

        PopulateFriendList();
    }

    public void Hide(){
        canvasGroup.alpha = 0;
        canvasGroup.blocksRaycasts = false;
        canvasGroup.interactable = false;
    }

    public void ShowAddFriendsPanel(){
        AddFriendErrorTxt.text ="";
        AddFriendUsernameInput.text = "";
        mainPanel.SetActive(false);
        AddFriendPanel.SetActive(true);
    }

    public void HideAddFriendsPanel(){
        mainPanel.SetActive(true);
        AddFriendPanel.SetActive(false);
    }
}