using System.Collections.Generic;
using UnityEngine;

public class Characters : GameplayBase
{
    public static Characters Instance = null;

    [SerializeField]
    private Transform player;

    [SerializeField]
    private List<string> npcIds;

    [SerializeField]
    private NPC tyra;

    public Location Nlocation;

    private List<GameObject> npcInstances;
    private List<string> activeNPCs;

    public List<GameObject> NpcInstances
    {
        get
        {
            return npcInstances;
        }
    }

    public List<string> ActiveNPCs
    {
        get
        {
            return activeNPCs;
        }
    }

    private void Awake()
    {
        Instance = this;
        npcInstances = new List<GameObject>();
        activeNPCs = new List<string>();
    }

    private bool EvaluateNpcActivation()
    {
        bool canActivateNpc = false;
        if (currentConversation.ConvType != DataTools.ConversationType.PhoneCall)
        {
            if (currentConversation.ConvType != DataTools.ConversationType.TextMessage)
            {
                if (currentConversation.ConvType != DataTools.ConversationType.Email)
                {
                    canActivateNpc = true;
                }
            }                
        }
        return canActivateNpc;
    }

    private void SetCharactersPosition()
    {
        DestroyNPC();

        if (Nlocation.isMap)
        {
            TurnOnOffPlayer(false);
            return;
        }
        else
        {
            TurnOnOffPlayer(true);
            SetPlayer(Nlocation.PlayerLocation);
        }

        if (currentConversation != null)
        {
            if (EvaluateNpcActivation())
            {
                if (currentConversation != null && Nlocation.ID.ToUpper() == currentConversation.Location.ToUpper())
                {
                    int npcIndex = 0;

                    foreach (Transform t in Nlocation.NPCLocation)
                    {
                        if (npcIndex < currentConversation.NpcId.Count)
                        {
                            NPCSetup(npcIndex, t);
                            npcIndex++;
                        }
                    }
                }
            }
        }
    }

    protected override void OnLocationChanged(Location location)
    {
        Nlocation = location;

        Invoke(isGigActive ? "SetCharactersPositionForGig":"SetCharactersPosition", 0.3f);
    }

    protected override void SetConversation(DataTools.Conversation conversation)
    {
        bool hasSameNPCIds = false;

        if (currentConversation != null)
        {
            if (EvaluateNpcActivation())
            {
                if (currentConversation.NpcId.Count == conversation.NpcId.Count)
                {
                    foreach (string npcId in currentConversation.NpcId)
                    {
                        hasSameNPCIds = conversation.NpcId.Find(n => n.ToUpper().Contains(npcId.ToUpper()) || npcId.ToUpper().Contains(n.ToUpper())) != null;

                        if (!hasSameNPCIds)
                        {
                            break;
                        }
                    }
                }
            }
        }
        
        base.SetConversation(conversation);
        
        if (!hasSameNPCIds && currentConversation.Location.ToUpper() == Nlocation.ID.ToUpper())
        { 
            if(EvaluateNpcActivation())
            {
                if (FadeScreen.Instance.active)
                {
                    SetCharactersPosition();
                }
                else
                {
                    FadeScreen.Instance.FadeIn(5, () =>
                    {
                        SetCharactersPosition();
                        FadeScreen.Instance.FadeOut(2);
                    });
                }
			}
        }
    }

    private void SetPlayer(Transform playerLoc)
    {
        player.transform.position = playerLoc.position;
        player.transform.localScale = playerLoc.localScale;
        player.transform.eulerAngles = playerLoc.eulerAngles;
    }

    private void NPCSetup(int index, Transform t)
    {
        GameObject npc = null;

        if (currentConversation.NpcId[index] != tyra.name)
        {
            string npcId = npcIds.Find(s => s.ToUpper() == currentConversation.NpcId[index].ToUpper());

            npc = Instantiate(Resources.Load(npcId) as GameObject);
        }
        else
        {
            npc = tyra.gameObject;
        }

        if (npc != null)
        {
            npc.transform.position = t.position;
            npc.transform.eulerAngles = t.eulerAngles;
            npc.transform.localScale = t.localScale;
            npcInstances.Add(npc);
            activeNPCs.Add(currentConversation.NpcId[index]);
            npc.gameObject.SetActive(true);

            Navigation.Instance.SetCurrentNpcs(npc.transform);
        }
    }

    public bool Exist(string npcId)
    {
        bool exist = npcIds.Find(n => n.ToUpper().Contains(npcId.ToUpper())) != null;

        if (!exist)
        {
            exist = tyra.Name.Contains(npcId);
        }

        return exist;
    }

    private void DestroyNPC()
    {
        foreach (GameObject npc in npcInstances)
        {
            if (npc.name != tyra.name)
            {
                Destroy(npc);
            }
            else
            {
                tyra.gameObject.SetActive(false);
            }
        }

        npcInstances.Clear();
        activeNPCs.Clear();

        Navigation.Instance.ClearCurrentNpcs();
    }

    private void TurnOnOffPlayer(bool _Active)
    {
        player.gameObject.SetActive(_Active);
    }

    public Transform GetCurrentNpc(string _nameNPC)
    {
        if (EvaluateNpcActivation())
        {
            int npcIndex = 0;

            foreach (Transform t in Nlocation.NPCLocation)
            {
                if (npcIndex < currentConversation.NpcId.Count)
                {
                    if (currentConversation.NpcId[npcIndex].ToUpper() == _nameNPC.ToUpper())
                    {
                        return Nlocation.NPCLocation[npcIndex];
                    }

                    npcIndex++;
                }
            }
        }

        return null;
    }

    #region NPC during gigs

    private bool isGigActive = false;
    private DataTools.Gig currentGig = null;

    public bool IsGigActive
    {
        get
        {
            return isGigActive;
        }
        set
        {
            isGigActive = value;
        }
    }

    public void SetGig(DataTools.Gig gig)
    {
        currentGig = gig;

        List<string> gigCrew = null;

        if (currentGig != null && ((gigCrew = CommentsManager.Instance.GetGigCrew(currentGig.Location, currentGig.Id))!=null) && gigCrew.Count>0)
        {
            bool alreadyFlag = IsGigNPCsAlreadyInstantiated(gigCrew);
            bool locationFlag = Nlocation.ID.ToUpper() == currentGig.Location.ToUpper();

            if(!alreadyFlag && locationFlag)
            {
                FadeScreen.Instance.FadeIn(5, () =>
                {
                    SetCharactersPositionForGig();
                    FadeScreen.Instance.FadeOut(2);
                });
            }
        }
    }

    public void ResetGig()
    {
        currentGig = null;
    }

    /// <summary>
    /// Version of SetCharacterPositions() for spwning gig crew
    /// </summary>
    private void SetCharactersPositionForGig()
    {
        DestroyNPC();

        if (Nlocation.isMap)
        {
            TurnOnOffPlayer(false);
            return;
        }
        else
        {
            TurnOnOffPlayer(true);
            SetPlayer(Nlocation.PlayerLocation);
        }

        if (isGigActive)
        {
            if(currentGig != null && Nlocation.ID.ToUpper() == currentGig.Location.ToUpper())
            {
                List<string> gigCrew = CommentsManager.Instance.GetGigCrew(currentGig.Location, currentGig.Id);
                int count = Mathf.Min(Nlocation.NPCLocation.Length, gigCrew.Count);

                for(int i = 0; i < count; i++)
                {
                    CreateNPC(gigCrew[i], Nlocation.NPCLocation[i]);
                }
            }
        }
    }

    /// <summary>
    /// Get specific NPC if it already present on location
    /// </summary>
    /// <param name="_npc">Name or ID of requred NPC</param>
    /// <returns>NPC component of instantiated gameobject</returns>
    public NPC GetInstantiatedNPC(string _npc)
    {
        foreach(GameObject go in npcInstances)
        {
            NPC npcObject = go.GetComponent<NPC>();

            if(npcObject.Name == _npc)
            {
                return npcObject;
            }
        }

        return null;
    }

    private NPC CreateNPC(string name, Transform t)
    {
        NPC npc = null;
        GameObject go = null;

        if(name != tyra.Name)
        {
            if(npcIds.Contains(name))
            {
                go = Instantiate(Resources.Load(name) as GameObject);
                npcInstances.Add(go);
                npc = go.GetComponent<NPC>();
            }
            else
            {
                Debug.LogWarning("NPC with name " + name + " does not exist");
                return null;
            }
        }
        else
        {
            npcInstances.Add(tyra.gameObject);
            go = tyra.gameObject;
            npc = tyra;
        }

        if (go != null)
        {
            go.transform.position = t.position;
            go.transform.eulerAngles = t.eulerAngles;
            go.transform.localScale = t.localScale;
            npcInstances.Add(go);
            activeNPCs.Add(name);
            go.SetActive(true);

            Navigation.Instance.SetCurrentNpcs(go.transform);
        }

        return npc;
    }

    public bool IsGigNPCsAlreadyInstantiated(List<string> _npcs)
    {
        bool instantiated = false;

        foreach (string npc in _npcs)
        {
            instantiated = Characters.Instance.ActiveNPCs.IndexOf(npc) != -1;

            if (!instantiated)
            {
                return instantiated;
            }
        }

        return instantiated;
    }
    #endregion
}