using System.Linq;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using SiegeSong;


namespace SiegeSong
{
    public class InventoryManager : MonoBehaviour
    {
        public HintManager HintManager;
        public InstanceManager InstanceManager;
        public EquipmentManager EquipmentManager;
        public ApparrelManager ApparrelManager;
        public RuntimeManager RuntimeManager;

        public AudioClip[] OpenMenuSounds;
        public AudioClip[] MenuClickSounds;
        public AudioClip[] MenuActivateSounds;

        public GameObject MenuWrapper;
        public GameObject WorldHudWrapper;
        public bool InventoryScreenOpen;

        public GameObject CameraObject;

        public GameObject TransferScreen;
        public GameObject InventoryScreen;

        public Text DescriptionLabel;
        public Text EffectsLabel;
        //public SkinnedMesh PreviewMesh;

        public Text CurrentHealthLabel;
        public Text MaxHealthLabel;
        public Slider HealthSlider;
        public Text CurrentStaminaLabel;
        public Text MaxStaminaLabel;
        public Slider StaminaSlider;
        public Text CurrentMagicLabel;
        public Text MaxMagicLabel;
        public Slider MagicSlider;
        public Text CurrentCarryWeightLabel;
        public Text MaxCarryWeightLabel;
        public Text CurrentGoldLabel;

        public StatisticsManager Actor;

        public Container Inventory;

        public bool TransferScreenOpen;
        public bool TransferTargetSelf;
        public Text TransferSelfLabel;
        public Text TransferOtherLabel;
        public GameObject TransferOtherPointer;
        public GameObject TransferSelfPointer;
        public Container TransferOther;
        public GameObject TransferRowArea;
        public GameObject TransferRowPrefab;

        public GameObject ItemDictionary;
        public int SelectedItemID;
        public int SelectedAmount;
        public GameObject InventoryRowArea;
        public GameObject InventoryRowPrefab;

        public bool OpenInputNewState;
        public bool UpArrowInputNewState;
        public bool DownArrowInputNewState;
        public bool ActivateInputNewState;
        public bool DropInputNewState;

        public int SelectedItemIndex;

        public int ActiveTab;
        public int ActivePage;

        public Transform DroppedItemStartPosition;
        public bool DroppingItem;

        private Color enabledTextColor;
        private Color disabledTextColor;

        private float transferRowHeight = 24.0f;
        private float inventoryRowHeight = 24.0f;
        private float inputAxisThreshhold = 0.1f;

        private float rowsXOffset = 0f;
        private float rowsYOffset = 0f;

        private List<GameObject> TransferRows;
        private List<GameObject> inventoryRowObjects;
        private Dictionary<int, GameObject> inventoryRowObjectDictionary;


        void Start()
        {
            Inventory.InventoryManager = this;
            SelectedAmount = 1;
        }

        public void SelectNextRow(bool previous = false)
        {
            var soundIndex = Random.Range(0, MenuClickSounds.Length);
            Actor.AudioSource.clip = MenuClickSounds[soundIndex];
            Actor.AudioSource.Play();
            if (previous)
            {
                if (SelectedItemIndex > 0)
                    SelectedItemIndex--;
                else
                    SelectedItemIndex = TransferScreenOpen && !TransferTargetSelf ? TransferOther.Contents.Count - 1 : Inventory.Contents.Count - 1;
            }
            else
            {
                if (SelectedItemIndex >= (TransferScreenOpen && !TransferTargetSelf ? TransferOther.Contents.Count - 1 : Inventory.Contents.Count - 1))
                    SelectedItemIndex = 0;
                else
                    SelectedItemIndex++;
            }

            if (InventoryScreenOpen || (TransferScreenOpen && TransferTargetSelf))
                SelectedItemID = Inventory.Contents.Keys.ElementAt(SelectedItemIndex);
            if (TransferScreenOpen && !TransferTargetSelf)
                SelectedItemID = TransferOther.Contents.Keys.ElementAt(SelectedItemIndex);

            if (InventoryScreenOpen)
                UpdateInventoryScreen();
            if (TransferScreenOpen)
                UpdateTransferScreen();
        }

        public void SelectPreviousRow()
        {
            SelectNextRow(true);
        }

        public void TransferSelectedItem()
        {
            var soundIndex = Random.Range(0, MenuActivateSounds.Length);
            Actor.AudioSource.clip = MenuActivateSounds[soundIndex];
            Actor.AudioSource.Play();
            if (TransferTargetSelf)
            {
                TransferOther.AddItem(SelectedItemID, SelectedAmount);
                RemoveItem();
                if (InventoryScreenOpen)
                    UpdateInventoryScreen();
                if (TransferScreenOpen)
                    UpdateTransferScreen();
            }
            else
            {
                TransferOther.RemoveItem(SelectedItemID, SelectedAmount);
                AddItem();
                if (InventoryScreenOpen)
                    UpdateInventoryScreen();
                if (TransferScreenOpen)
                    UpdateTransferScreen();
            }
        }

        public void SwitchTransferTarget()
        {
            SelectedItemIndex = 0;
            TransferTargetSelf = !TransferTargetSelf;
            HintManager.SetHint(HintArea.FarLeft, $"{(TransferTargetSelf ? "Take" : "Give")} Item", InputButton.ActivateAccept);
        }

        void Update()
        {

            if (TransferScreenOpen || InventoryScreenOpen)
            {
                if (InventoryScreenOpen)
                {
                    CurrentHealthLabel.text = Actor.Stats.Health.ToString("0");
                    MaxHealthLabel.text = Actor.Stats.MaxHealth.ToString("0");
                    HealthSlider.value = Actor.Stats.Health;
                    CurrentStaminaLabel.text = Actor.Stats.Stamina.ToString("0");
                    MaxStaminaLabel.text = Actor.Stats.MaxStamina.ToString("0");
                    StaminaSlider.value = Actor.Stats.Stamina;
                    CurrentMagicLabel.text = Actor.Stats.Magic.ToString("0");
                    MaxMagicLabel.text = Actor.Stats.MaxMagic.ToString("0");
                    MagicSlider.value = Actor.Stats.Magic;
                }
            }
        }

        public void NextIndex()
        {

            if (SelectedItemIndex < Inventory.Contents.Count)
                SelectedItemIndex++;
            else
                SelectedItemIndex = 0;
            if (InventoryScreenOpen)
                UpdateInventoryScreen();
            if (TransferScreenOpen)
                UpdateTransferScreen();
        }

        public void PreviousIndex()
        {

            if (SelectedItemIndex > 0)
                SelectedItemIndex--;
            else
                SelectedItemIndex = Inventory.Contents.Count;
            if (InventoryScreenOpen)
                UpdateInventoryScreen();
            if (TransferScreenOpen)
                UpdateTransferScreen();
        }

        public void UpdateTransferScreen()
        {
            if (TransferRows != null)
            {
                foreach (var uiRow in TransferRows)
                {
                    uiRow.SetActive(false);
                    GameObject.Destroy(uiRow);
                }
            }

            for (var i = 0; i < TransferRowArea.transform.childCount; i++)
            {
                var row = TransferRowArea.transform.GetChild(i);
                row.gameObject.SetActive(false);
                GameObject.Destroy(row);
            }

            TransferRows = new List<GameObject>();

            var itemCount = TransferTargetSelf || TransferOther == null ? Inventory.Contents.Count : (TransferOther.Contents != null ? TransferOther.Contents.Count : 0);

            for (var i = 0; i < itemCount; i++)
            {
                var uiRow = Instantiate(TransferRowPrefab);
                var uiRowProperties = uiRow.GetComponent<InventoryRow>();
                uiRowProperties.InventoryManager = this;
                var targetItemId = TransferTargetSelf ? Inventory.Contents.Keys.ElementAt(i) : TransferOther.Contents.Keys.ElementAt(i);
                var targetItem = GetItemByID(targetItemId);
                if (targetItem != null && targetItem.GetComponent<InventoryItem>() != null)
                {
                    uiRowProperties.ItemID = targetItem.GetComponent<InventoryItem>().ID;
                    var uiRowRect = uiRow.GetComponent<RectTransform>();

                    uiRowRect.position = new Vector2(0, transferRowHeight * -(i + 1));
                    uiRowRect.offsetMin = new Vector2(0, transferRowHeight * -(i + 1));
                    uiRowRect.offsetMax = new Vector2(0, transferRowHeight * -(i));
                    uiRowRect.sizeDelta = new Vector2(0, transferRowHeight);

                    foreach (Transform childTransform in uiRow.transform)
                    {
                        var child = childTransform.gameObject;
                        if (child.name == "icon")
                        {
                            if (TransferTargetSelf)
                            {
                                var activeIdsList = new List<int>(ApparrelManager.CurrentlyActiveIDs);
                                child.GetComponent<Image>().enabled = activeIdsList.Contains(Inventory.Contents.Keys.ElementAt(i));
                            }
                            else if (TransferOther.gameObject.GetComponentInChildren<ApparrelManager>() != null)
                            {
                                var activeIdsList = new List<int>(TransferOther.gameObject.GetComponentInChildren<ApparrelManager>().CurrentlyActiveIDs);
                                child.GetComponent<Image>().enabled = activeIdsList.Contains(Inventory.Contents.Keys.ElementAt(i));
                            }
                        }

                        if (child.name == "highlight")
                            child.SetActive(SelectedItemIndex == i);
                            
                        //foreach (Transform hlChildTransform in childTransform)
                            //hlChildTransform.gameObject.GetComponent<Image>().enabled = SelectedItemIndex == i;

                        if (child.name == "name")
                            child.GetComponent<Text>().text = GetItemByID(TransferTargetSelf ? Inventory.Contents.Keys.ElementAt(i) : TransferOther.Contents.Keys.ElementAt(i)).GetComponent<InventoryItem>().FriendlyName;

                        if (child.name == "weight")
                            child.GetComponent<Text>().text = GetItemByID(TransferTargetSelf ? Inventory.Contents.Keys.ElementAt(i) : TransferOther.Contents.Keys.ElementAt(i)).GetComponent<InventoryItem>().PhysicalWeight.ToString();

                        if (child.name == "value")
                            child.GetComponent<Text>().text = GetItemByID(TransferTargetSelf ? Inventory.Contents.Keys.ElementAt(i) : TransferOther.Contents.Keys.ElementAt(i)).GetComponent<InventoryItem>().MonetaryValue.ToString();

                    }
                    TransferRows.Add(uiRow);
                }
            } 
        }

        public void OpenInventoryScreen()
        {
            var soundIndex = Random.Range(0, OpenMenuSounds.Length);
            HintManager.SetHint(HintArea.FarLeft, "Equip to Main-Hand", InputButton.ActivateAccept);
            HintManager.SetHint(HintArea.MidLeft, "Equip to Off-Hand", InputButton.JumpClimb);
            HintManager.SetHint(HintArea.MidRight, "Drop Item", InputButton.SwapUseAbility); 
            HintManager.SetHint(HintArea.FarRight, "Exit Menu", InputButton.BackReject);
            Actor.AudioSource.clip = OpenMenuSounds[soundIndex];
            Actor.AudioSource.Play();

            WorldHudWrapper.SetActive(false);
            MenuWrapper.SetActive(true);

            InventoryScreenOpen = true;
            InventoryScreen.SetActive(true);
            TransferTargetSelf = true;

            UpdateInventoryScreen();
        }

        public void OpenTransferMenu(Container transferOther)
        {
            var soundIndex = Random.Range(0, OpenMenuSounds.Length);
            HintManager.SetHint(HintArea.FarLeft, $"{(TransferTargetSelf ? "Take" : "Give")} Item", InputButton.ActivateAccept);
            HintManager.SetHint(HintArea.MidLeft, "Swap Targets", InputButton.SwapUseAbility);
            HintManager.SetHint(HintArea.Center, "Exit Menu", InputButton.BackReject);
            HintManager.SetHint(HintArea.MidRight, "");
            HintManager.SetHint(HintArea.FarRight, "");
            Actor.AudioSource.clip = OpenMenuSounds[soundIndex];
            Actor.AudioSource.Play();

            WorldHudWrapper.SetActive(false);
            MenuWrapper.SetActive(true);

            SelectedItemIndex = 0;
            TransferOther = transferOther;
            TransferScreenOpen = true;
            TransferTargetSelf = false;
            TransferScreen.SetActive(true);
            UpdateTransferScreen();
        }

        public void CloseInventoryScreen()
        {
            var soundIndex = Random.Range(0, OpenMenuSounds.Length);
            HintManager.SetHint(HintArea.FarLeft, "");
            HintManager.SetHint(HintArea.MidLeft, "");
            HintManager.SetHint(HintArea.Center, "");
            HintManager.SetHint(HintArea.MidRight, "");
            HintManager.SetHint(HintArea.FarRight, "");
            Actor.AudioSource.clip = OpenMenuSounds[soundIndex];
            Actor.AudioSource.Play();

            WorldHudWrapper.SetActive(true);
            MenuWrapper.SetActive(false);
            InventoryScreenOpen = false;
            InventoryScreen.SetActive(false);
        }

        public void CloseTransferScreen()
        {
            var soundIndex = Random.Range(0, OpenMenuSounds.Length);
            Actor.AudioSource.clip = OpenMenuSounds[soundIndex];
            Actor.AudioSource.Play();

            WorldHudWrapper.SetActive(true);
            MenuWrapper.SetActive(false);
            TransferTargetSelf = true;
            TransferScreenOpen = false;
            TransferScreen.SetActive(false);
        }

        public void AddInventoryRow(int itemID, int itemQuantity)
        {
            var uiRow = Instantiate(InventoryRowPrefab);
            if (inventoryRowObjects == null)
            {
                inventoryRowObjectDictionary = new Dictionary<int, GameObject>();
                inventoryRowObjects = new List<GameObject>();
            }
            inventoryRowObjectDictionary.Add(itemID, uiRow);
            inventoryRowObjects.Add(uiRow);
            var uiRowProperties = uiRow.GetComponent<InventoryRow>();
            var uiRowRect = uiRow.GetComponent<RectTransform>();
            uiRow.SetActive(true);
            uiRowProperties.InventoryManager = this;
            uiRowProperties.ItemID = itemID;

            uiRowRect.rotation = Quaternion.Euler(Vector3.zero);
            uiRow.transform.SetParent(InventoryRowArea.transform, false);

            uiRowRect.position = new Vector2(0, inventoryRowHeight * -(inventoryRowObjects.Count + 1));
            uiRowRect.offsetMin = new Vector2(0, inventoryRowHeight * -(inventoryRowObjects.Count + 1));
            uiRowRect.offsetMax = new Vector2(0, inventoryRowHeight * -(inventoryRowObjects.Count));
            uiRowRect.sizeDelta = new Vector2(0, inventoryRowHeight);

            uiRow.transform.localScale = Vector3.one;

            UpdateInventoryRow(itemID, itemQuantity);
        }

        public void UpdateInventoryRow(int itemID, int itemQuantity, bool selected = false)
        {
            var uiRow = inventoryRowObjectDictionary[itemID];
            var uiRowProperties = uiRow.GetComponent<InventoryRow>();

            if (selected)
            {
                DescriptionLabel.text = GetItemByID(itemID).GetComponent<InventoryItem>().Description;
                EffectsLabel.text = string.Join("\n", GetItemByID(itemID).GetComponent<InventoryItem>().Effects);
            }

            var targetItem = GetItemByID(uiRowProperties.ItemID);
            if (inventoryRowObjects != null && targetItem != null && targetItem.GetComponent<InventoryItem>() != null)
            {
                foreach (Transform childTransform in uiRow.transform)
                {
                    var child = childTransform.gameObject;
                    if (child.name == "icon")
                    {
                        if (TransferTargetSelf)
                        {
                            var activeIdsList = new List<int>(ApparrelManager.CurrentlyActiveIDs);
                            child.GetComponent<Image>().enabled = activeIdsList.Contains(itemID);
                        }
                        else if (TransferOther != null && TransferOther.gameObject.GetComponentInChildren<ApparrelManager>() != null)
                        {
                            var activeIdsList = new List<int>(TransferOther.gameObject.GetComponentInChildren<ApparrelManager>().CurrentlyActiveIDs);
                            child.GetComponent<Image>().enabled = activeIdsList.Contains(itemID);
                        }
                        else
                        {
                            child.GetComponent<Image>().enabled = false;
                        }
                    }

                    if (child.name == "highlight")
                        foreach (Transform hlChildTransform in childTransform)
                            hlChildTransform.gameObject.GetComponent<Image>().enabled = selected;

                    if (child.name == "name")
                        child.GetComponent<Text>().text = GetItemByID(itemID).GetComponent<InventoryItem>().FriendlyName;

                    if (child.name == "quantity")
                        child.GetComponent<Text>().text = itemQuantity.ToString();

                    if (child.name == "weight")
                        child.GetComponent<Text>().text = GetItemByID(itemID).GetComponent<InventoryItem>().PhysicalWeight.ToString();

                    if (child.name == "value")
                        child.GetComponent<Text>().text = GetItemByID(itemID).GetComponent<InventoryItem>().MonetaryValue.ToString();

                    if (child.name == "condition")
                    {
                        var item = GetItemByID(itemID).GetComponent<InventoryItem>();
                        child.GetComponent<Text>().text = item.PhysicalCondition + "/" + item.MaxPhysicalCondition;
                    }
                }
            }
        }

        public void UpdateInventoryScreen()
        {
            CurrentCarryWeightLabel.text = Actor.Stats.CarryWeight.ToString("0");
            MaxCarryWeightLabel.text = Actor.Stats.MaxCarryWeight.ToString("0");
            CurrentGoldLabel.text = Actor.Stats.Gold.ToString("0");

            var container = new Dictionary<int, int>();

            switch (ActiveTab)
            {
                // Inventory
                case 0:
                    var itemCategory = InventoryCategory.Items;
                    switch (ActivePage)
                    {
                        case 0:
                            itemCategory = InventoryCategory.EquipmentAndAparrel;
                            break;
                        case 1:
                            itemCategory = InventoryCategory.Items;
                            break;
                        case 2:
                            itemCategory = InventoryCategory.MapsAndNotes;
                            break;
                    }
                    for (var i = 0; i < Inventory.Contents.Count; i++)
                    {
                        var itemQuantity = Inventory.Contents[Inventory.Contents.Keys.ElementAt(i)];
                        var itemID = Inventory.Contents.Keys.ElementAt(i);
                        var inventoryItem = GetItemByID(itemID).GetComponent<InventoryItem>();
                        if (inventoryItem.Category == itemCategory)
                            container.Add(itemID, itemQuantity);
                    }
                    if (SelectedItemID == 0 && Inventory.Contents.Count > 0)
                        SelectedItemID = Inventory.Contents.Keys.ElementAt(0);
                    break;
                // Abilities & Intel
                case 1:
                    switch (ActivePage)
                    {
                        // Activated Abilities
                        case 0:
                            break;
                        // Passive Abilities
                        case 1:
                            break;
                        // Intel (AKA Dialogue-Only Abilities)
                        case 2:
                            break;
                    }
                    break;
                // Character
                case 2:
                    switch (ActivePage)
                    {
                        // Skills & Attributes
                        case 0:
                            break;
                        // Factions & Bounties
                        case 1:
                            break;
                        // Tasks
                        case 2:
                            break;
                    }
                    break;
            }

            for (var i = 0; i < container.Count; i++)
            {
                var containerEntry = container.ElementAt(i);
                UpdateInventoryRow(containerEntry.Key, containerEntry.Value, SelectedItemIndex == i);
            }
        }

        public GameObject GetItemByID(int ID)
        {
            for (var i = 0; i < ItemDictionary.transform.childCount; i++)
            {
                if (ItemDictionary.transform.GetChild(i).GetComponent<InventoryItem>().ID == ID)
                {
                    return ItemDictionary.transform.GetChild(i).gameObject;
                }
            }
            return null;
        }

        public void DropItem()
        {
            for (var i = 0; i < SelectedAmount; i++)
            {
                var inventoryItem = GetItemByID(SelectedItemID).GetComponent<InventoryItem>();
                var droppedObject = new WorldObjectPlacement();
                droppedObject.FriendlyName = inventoryItem.FriendlyName;
                droppedObject.PositionX = DroppedItemStartPosition.position.x;
                droppedObject.PositionY = DroppedItemStartPosition.position.y;
                droppedObject.PositionZ = DroppedItemStartPosition.position.z;
                droppedObject.RotationX = DroppedItemStartPosition.eulerAngles.x;
                droppedObject.RotationY = DroppedItemStartPosition.eulerAngles.y;
                droppedObject.RotationZ = DroppedItemStartPosition.eulerAngles.z;
                droppedObject.Key = inventoryItem.DroppableKey;
                InstanceManager.InstantiateWorldObject(droppedObject);
            }
            RemoveItem();
            DroppingItem = false;
        }

        public void AddItem(int itemID, int itemQuantity)
        {
            SelectedItemID = itemID;
            SelectedAmount = itemQuantity;
            AddItem();
        }

        public void AddItem()
        {
            AddInventoryRow(SelectedItemID, SelectedAmount);
            Inventory.AddItem(SelectedItemID, SelectedAmount);
            UpdateInventoryScreen();
            UpdateTransferScreen();
        }

        public void RemoveItem()
        {
            if (inventoryRowObjectDictionary.ContainsKey(SelectedItemID))
            {
                var rowObject = inventoryRowObjectDictionary[SelectedItemID];
                Inventory.RemoveItem(SelectedItemID, SelectedAmount, this);
                rowObject.SetActive(false);
                inventoryRowObjects.Remove(rowObject);
                inventoryRowObjectDictionary.Remove(SelectedItemID);
                Destroy(rowObject);

                if (InventoryScreenOpen)
                    UpdateInventoryScreen();
                if (TransferScreenOpen)
                    UpdateTransferScreen();
            }
        }

        public void ActivateItem()
        {
            var soundIndex = Random.Range(0, MenuActivateSounds.Length);
            Actor.AudioSource.clip = MenuActivateSounds[soundIndex];
            Actor.AudioSource.Play();
            for (var i = 0; i < SelectedAmount; i++)
            {
                var gameObject = GetItemByID(SelectedItemID);
                if (gameObject)
                { 
                    var item = gameObject.GetComponent<InventoryItem>();
                    if (item != null)
                        item.Activate(ApparrelManager);
                }
            }
            if (InventoryScreenOpen)
                UpdateInventoryScreen();
            if (TransferScreenOpen)
                UpdateTransferScreen();
        }
    }
}