using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System.Collections.Generic;
using XInputDotNetPure;
using System.Diagnostics;
using UnityEngine.EventSystems;

public class ControllerMenuSelector : MonoBehaviour {
    int index = 0;
    GamePadState prevState;
    GamePadState currentState;
    public Selectable currentItem;
    ServerManager serverManager;
    bool lastButtonState;
    Stopwatch reactionTimer;
    // Use this for initialization
    void Start() {
        reactionTimer = new Stopwatch();
        if (serverManager == null) {
            serverManager = FindObjectOfType<ServerManager>();
        }
        serverManager.PageChanged += delegate {
            foreach (Selectable item in FindObjectsOfType<Selectable>()) {
                if (item.enabled) {
                    currentItem = item;
                    break;
                }
            }
        };
        foreach (Selectable item in FindObjectsOfType<Selectable>()) {
            if (item.enabled) {
                currentItem = item;
                break;
            }
        }
    }

    // Update is called once per frame
    void Update() {
        currentState = GamePad.GetState(0);
        if (currentItem == null) {
            foreach (Selectable item in FindObjectsOfType<Selectable>()) {
                if (item.enabled) {
                    currentItem = item;
                    break;
                }
            }
        }
        List<Selectable> selectableItems = new List<Selectable>();
        if (reactionTimer.ElapsedMilliseconds >= 150) {
            reactionTimer.Stop();
            reactionTimer.Reset();
        }
        if (!reactionTimer.IsRunning) {
            lastButtonState = (Input.GetKeyUp(KeyCode.UpArrow)
                || Input.GetKeyUp(KeyCode.DownArrow)
                || Input.GetKeyUp(KeyCode.LeftArrow)
                || Input.GetKeyUp(KeyCode.RightArrow));
            if (currentItem != null) {
                if ((prevState.DPad.Up == ButtonState.Pressed
                    && currentState.DPad.Up == ButtonState.Released)
                    || Input.GetKey(KeyCode.UpArrow)) {
                    Selectable newItem = currentItem.FindSelectableOnUp();
                    if (newItem != null) {
                        ExecuteEvents.Execute(currentItem.gameObject,
                            new PointerEventData(EventSystem.current), ExecuteEvents.pointerExitHandler);
                        currentItem = newItem;
                        ExecuteEvents.Execute(currentItem.gameObject,
                            new PointerEventData(EventSystem.current), ExecuteEvents.pointerEnterHandler);
                    }
                    reactionTimer.Start();
                }
                if ((prevState.DPad.Down == ButtonState.Pressed
                    && currentState.DPad.Down == ButtonState.Released)
                    || Input.GetKey(KeyCode.DownArrow)) {
                    Selectable newItem = currentItem.FindSelectableOnDown();
                    if (newItem != null) {
                        ExecuteEvents.Execute(currentItem.gameObject,
                            new PointerEventData(EventSystem.current), ExecuteEvents.pointerExitHandler);
                        currentItem = newItem;
                        ExecuteEvents.Execute(currentItem.gameObject,
                            new PointerEventData(EventSystem.current), ExecuteEvents.pointerEnterHandler);
                    }
                    reactionTimer.Start();
                }
                if ((prevState.DPad.Left == ButtonState.Pressed
                    && currentState.DPad.Left == ButtonState.Released)
                    || Input.GetKey(KeyCode.LeftArrow)) {
                    Selectable newItem = currentItem.FindSelectableOnLeft();
                    if (newItem != null) {
                        ExecuteEvents.Execute(currentItem.gameObject,
                            new PointerEventData(EventSystem.current), ExecuteEvents.pointerExitHandler);
                        currentItem = newItem;
                        ExecuteEvents.Execute(currentItem.gameObject,
                            new PointerEventData(EventSystem.current), ExecuteEvents.pointerEnterHandler);
                    }
                    reactionTimer.Start();
                }
                if ((prevState.DPad.Right == ButtonState.Pressed
                    && currentState.DPad.Right == ButtonState.Released)
                    || Input.GetKey(KeyCode.RightArrow)) {
                    Selectable newItem = currentItem.FindSelectableOnRight();
                    if (newItem != null) {
                        ExecuteEvents.Execute(currentItem.gameObject,
                            new PointerEventData(EventSystem.current), ExecuteEvents.pointerExitHandler);
                        currentItem = newItem;
                        ExecuteEvents.Execute(currentItem.gameObject,
                            new PointerEventData(EventSystem.current), ExecuteEvents.pointerEnterHandler);
                    }
                    reactionTimer.Start();
                }
                if ((prevState.Buttons.A == ButtonState.Pressed
                    && currentState.Buttons.A == ButtonState.Released)
                    || Input.GetKey(KeyCode.Return)) {
                    ExecuteEvents.Execute(currentItem.gameObject,
                        new PointerEventData(EventSystem.current), ExecuteEvents.pointerDownHandler);
                    ExecuteEvents.Execute(currentItem.gameObject,
                        new PointerEventData(EventSystem.current), ExecuteEvents.pointerUpHandler);
                }
                if ((prevState.Buttons.B == ButtonState.Pressed
                    && currentState.Buttons.B == ButtonState.Released)
                    || Input.GetKey(KeyCode.Escape)) {
                    serverManager.GoBack();
                }
            }
        }
        prevState = currentState;
    }
}