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

namespace SiegeSong
{
    public class GlobalPauseMenu : MonoBehaviour
    {
        public GameObject PauseMenu;
        public GameObject OptionsContainer;

        private string pauseGamepadInput = "Start";
        private string menuVerticalGamepadInput = "D-Pad Vertical";
        private string menuHorizontalGamepadInput = "D-Pad Horizontal";
        private string menuConfirmGamepadInput = "A";
        private string menuRejectGamepadInput = "B";

        private bool oldConfirmState;
        private bool oldRejectState;
        private float oldVerticalState;
        private float oldHorizontalState;

        private bool open;
        private int selectedIndex;

        private Color activeColor = Color.white;
        private Color inactiveColor = Color.grey;

        private int activeFontSize;
        private int inactiveFontSize;

        private bool loadingSubmenuOpen;
        private bool savingSubmenuOpen;
        private bool settingsSubmenuOpen;

        void Start()
        {
        
        }

        void Update()
        {
            if (!open && Input.GetButton(pauseGamepadInput))
            {
                open = true;
                Time.timeScale = 0.0f;
                PauseMenu.active = true;
            }

            if (open)
            {
                for (var i = 0; i < OptionsContainer.transform.childCount; i++)
                {
                    var childObject = OptionsContainer.transform.GetChild(i);
                    childObject.GetComponent<Text>().text = selectedIndex == i ? $"- {childObject.name} -" : childObject.name;
                    childObject.GetComponent<Text>().color = selectedIndex == i ? activeColor : inactiveColor;
                    childObject.GetComponent<Text>().fontSize = selectedIndex == i ? activeFontSize : inactiveFontSize;
                }
                var newConfirmState = Input.GetButton(menuConfirmGamepadInput);
                var newRejectState = Input.GetButton(menuRejectGamepadInput);
                var newMenuVerticalState = Input.GetAxis(menuVerticalGamepadInput);
                var newMenuHorizontalState = Input.GetAxis(menuHorizontalGamepadInput);
                if (oldVerticalState == 0 && newMenuVerticalState < 0)
                {
                    if (selectedIndex == OptionsContainer.transform.childCount - 1)
                        selectedIndex = 0;
                    else
                        selectedIndex++;
                }
                if (oldVerticalState == 0 && newMenuVerticalState > 0)
                {
                    if (selectedIndex == 0)
                        selectedIndex = OptionsContainer.transform.childCount - 1;
                    else
                        selectedIndex--;
                }
                if (!loadingSubmenuOpen && !savingSubmenuOpen && !settingsSubmenuOpen)
                {
                    if ((!oldConfirmState && newConfirmState) || (oldHorizontalState == 0 && newMenuHorizontalState > 0))
                    {
                        switch (selectedIndex)
                        {
                            case 0:
                                ResumeGame();
                                break;
                            case 1:
                                OpenLoadingSubmenu();
                                break;
                            case 2:
                                OpenSavingSubmenu();
                                break;
                            case 3:
                                OpenSettingsSubmenu();
                                break;
                            case 4:
                                ExitGame();
                                break;
                        }
                    }
                }
                oldConfirmState = newConfirmState;
                oldRejectState = newRejectState;
                oldHorizontalState = newMenuHorizontalState;
                oldVerticalState = newMenuVerticalState;
            }
        }

        void ResumeGame()
        {
            open = false;
            PauseMenu.active = false;
            Time.timeScale = 1.0f;
        }

        void OpenLoadingSubmenu()
        {
            loadingSubmenuOpen = true;
        }

        void OpenSavingSubmenu()
        {
            savingSubmenuOpen = true;
        }

        void OpenSettingsSubmenu()
        {
            settingsSubmenuOpen = true;
        }

        void ExitGame()
        {
            Application.Quit();
        }
    }
}