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

public class Inventory : MonoBehaviour
{
    ///////////////////////// Variables /////////////////////////

    //Inventory
    KeyValuePair<string, int>[] inv = new KeyValuePair<string, int>[12]; //Inventory Name Array
    int count = 0; //Number of slots filled.

    ///////////////////////// Functions /////////////////////////

    //Inventory Management
    void additem(int quantity, string item, GameObject obj)
    {
        if (count == 0)
        {
            inv[count] = new KeyValuePair<string, int>(item, quantity);
            GameObject.Destroy(obj);
            count++;
            return;
        }
        if (count < 12)
        {
            for (int i = 0; i < inv.Length; i++)
            {
                if (inv[i].Key == item)
                {
                    inv[i] = new KeyValuePair<string, int>(item, inv[i].Value + quantity);
                    GameObject.Destroy(obj);
                    return;
                }
            }
            inv[count] = new KeyValuePair<string, int>(item, quantity);
            GameObject.Destroy(obj);
            count++;
            return;
        }
    }
    int PickItemQuantity(string Name)
    {
        switch (Name)
        {
            case "Weapon 1":
                return 5;

            case "Weapon 2":
                return 5;

            case "Weapon 3":
                return 5;

            case "Health 1":
                return 2;

            case "Health 2":
                return 2;

            case "Health 3":
                return 2;

            default:
                return 1;
        }
    }
    void useItem(string name, int index)
    {
        PlayerMovement playmov = GetComponent<PlayerMovement>();
        switch (name)
        {
            case "Weapon 1":
                break;

            case "Weapon 2":
                break;

            case "Weapon 3":
                break;

            case "Health 1":
                playmov.ChangeHP(10);
                break;

            case "Health 2":
                playmov.ChangeHP(20);
                break;

            case "Health 3":
                playmov.ChangeHP(30);
                break;

            default:
                break;
        }
        if(inv[index].Value > 1)
        {
            inv[index] = new KeyValuePair<string, int>(name, inv[index].Value - 1);
        }
        else if (inv[index].Value == 1)
        {
            for(int i = index; i < count; i++)
            {
                if(i < 11)
                {
                    inv[i] = new KeyValuePair<string, int>(inv[i + 1].Key, inv[i + 1].Value);
                }

            }
            inv[count-1] = new KeyValuePair<string, int>(null, 0);
            count--;
        }
    }

    //GUI Management
    void pickcolor(string name)
    {
        switch (name)
        {
            case "Weapon 1":
                GUI.backgroundColor = Color.yellow;
                break;

            case "Weapon 2":
                GUI.backgroundColor = Color.blue;
                break;

            case "Weapon 3":
                GUI.backgroundColor = Color.red;
                break;

            case "Health 1":
                GUI.backgroundColor = Color.yellow;
                break;

            case "Health 2":
                GUI.backgroundColor = Color.blue;
                break;

            case "Health 3":
                GUI.backgroundColor = Color.red;
                break;

            default:
                break;
        }
    }


    ///////////////////////// Unity Functions /////////////////////////

    void Start()
    {
        GameObject player = GameObject.Find("Player");
    }

    void OnTriggerEnter(Collider col)
    {
        switch (col.gameObject.tag)
        {
            case "Enemy":
                break;

            case "Item":
                additem(PickItemQuantity(col.gameObject.name), col.gameObject.name, col.gameObject);
                break;

            default:
                break;
        }
    }

    void OnGUI()
    {
        //Normal Inventory
        if (Cursor.lockState == CursorLockMode.None)
        {
            pickcolor(inv[0].Key);
            if (GUI.Button(new Rect(40, 400, 125, 25), inv[0].Value + " - " + inv[0].Key))
            {
                useItem(inv[0].Key, 0);
            }
            GUI.backgroundColor = Color.gray;

            pickcolor(inv[1].Key);
            if (GUI.Button(new Rect(40, 425, 125, 25), inv[1].Value + " - " + inv[1].Key))
            {
                useItem(inv[1].Key, 1);
            }
            GUI.backgroundColor = Color.gray;

            pickcolor(inv[2].Key);
            if (GUI.Button(new Rect(40, 450, 125, 25), inv[2].Value + " - " + inv[2].Key))
            {
                useItem(inv[2].Key, 2);
            }
            GUI.backgroundColor = Color.gray;

            pickcolor(inv[3].Key);
            if (GUI.Button(new Rect(40, 475, 125, 25), inv[3].Value + " - " + inv[3].Key))
            {
                useItem(inv[3].Key, 3);
            }
            GUI.backgroundColor = Color.gray;

            pickcolor(inv[4].Key);
            if (GUI.Button(new Rect(40, 500, 125, 25), inv[4].Value + " - " + inv[4].Key))
            {
                useItem(inv[4].Key, 4);
            }
            GUI.backgroundColor = Color.gray;

            pickcolor(inv[5].Key);
            if (GUI.Button(new Rect(40, 525, 125, 25), inv[5].Value + " - " + inv[5].Key))
            {
                useItem(inv[5].Key, 5);
            }
            GUI.backgroundColor = Color.gray;

            if (count > 6)
            {
                pickcolor(inv[6].Key);
                if (GUI.Button(new Rect(165, 400, 125, 25), inv[6].Value + " - " + inv[6].Key))
                {
                    useItem(inv[6].Key, 6);
                }
                GUI.backgroundColor = Color.gray;
            }
            if (count > 7)
            {
                pickcolor(inv[7].Key);
                if (GUI.Button(new Rect(165, 425, 125, 25), inv[7].Value + " - " + inv[7].Key))
                {
                    useItem(inv[7].Key, 7);
                }
                GUI.backgroundColor = Color.gray;
            }
            if (count > 8)
            {
                pickcolor(inv[8].Key);
                if (GUI.Button(new Rect(165, 450, 125, 25), inv[8].Value + " - " + inv[8].Key))
                {
                    useItem(inv[8].Key, 8);
                }
                GUI.backgroundColor = Color.gray;
            }
            if (count > 9)
            {
                pickcolor(inv[9].Key);
                if (GUI.Button(new Rect(165, 475, 125, 25), inv[9].Value + " - " + inv[9].Key))
                {
                    useItem(inv[9].Key, 9);
                }
                GUI.backgroundColor = Color.gray;
            }
            if (count > 10)
            {
                pickcolor(inv[10].Key);
                if (GUI.Button(new Rect(165, 500, 125, 25), inv[10].Value + " - " + inv[10].Key))
                {
                    useItem(inv[10].Key, 10);
                }
                GUI.backgroundColor = Color.gray;
            }
            if (count > 11)
            {
                pickcolor(inv[11].Key);
                if (GUI.Button(new Rect(165, 525, 125, 25), inv[11].Value + " - " + inv[11].Key))
                {
                    useItem(inv[11].Key, 11);
                }
                GUI.backgroundColor = Color.gray;
            }
            GUI.Button(new Rect(25, 25, 25, 25), count + "");

            //Quick Inventory




        }
    }

}