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

namespace BNG {
    public class VRTextInput : MonoBehaviour {

        UnityEngine.UI.InputField thisInputField;

        public bool AttachToVRKeyboard = true;

        public bool ActivateKeyboardOnSelect = true;
        public bool DeactivateKeyboardOnDeselect = false;

        public VRKeyboard AttachedKeyboard;

        [Header("Keyboard Position")]
        [Tooltip("Transform to position the keyboard relative to (usually the player's hand or head)")]
        public Transform playerKeyboardPosition;
        
        [Tooltip("Distance in front of camera")]
        public float keyboardDistance = 10f;

        [Tooltip("Height offset from camera")]
        public float keyboardHeight = 1f;

        bool isFocused, wasFocused = false;

        float lastActivatedTime = 0;

        void Awake() {
            thisInputField = GetComponent<UnityEngine.UI.InputField>();
            
            if(thisInputField && AttachedKeyboard != null) {
                AttachedKeyboard.AttachToInputField(thisInputField);
            }

            // If no player position is set, try to find the main camera (usually attached to player's head)
            if (playerKeyboardPosition == null) {
                if (Camera.main != null) {
                    playerKeyboardPosition = Camera.main.transform;
                }
            }
        }

        void Update() {
            isFocused = thisInputField != null && thisInputField.isFocused;

            // Check if our input field is now focused
            if(isFocused == true && wasFocused == false) {
                OnInputSelect();
            }
            else if (isFocused == false && wasFocused == true) {
                OnInputDeselect();
            }

            wasFocused = isFocused;
        }

        /// <summary>
        /// Set the keyboard's active state and position
        /// </summary>
        /// <param name="active">Whether to show or hide the keyboard</param>
        /// <param name="position">Optional position to place the keyboard. If null, uses player position</param>
        public void SetKeyboardActive(bool active, Vector3? position = null) {
            if (AttachedKeyboard != null) {
                AttachedKeyboard.gameObject.SetActive(active);
                
                if (active) {
                    Vector3 targetPosition;
                    if (position.HasValue) {
                        targetPosition = position.Value;
                    } else if (playerKeyboardPosition != null) {
                        // Position keyboard 10 units in front and 1 unit up from camera
                        targetPosition = playerKeyboardPosition.position + 
                                       playerKeyboardPosition.forward * keyboardDistance +
                                       playerKeyboardPosition.up * keyboardHeight;
                    } else {
                        return; // No position to place keyboard
                    }

                    AttachedKeyboard.transform.position = targetPosition;
                }
            }
        }

        public void OnInputSelect() {
            // Enable keyboard if disabled
            if (ActivateKeyboardOnSelect && AttachedKeyboard != null && !AttachedKeyboard.gameObject.activeInHierarchy) {
                SetKeyboardActive(true);
                AttachedKeyboard.AttachToInputField(thisInputField);
                lastActivatedTime = Time.time;
            }
        }

        public void OnInputDeselect() {
            // Deslect if valid keyboard is found, and did not recently activate
            if (DeactivateKeyboardOnDeselect && AttachedKeyboard != null && AttachedKeyboard.gameObject.activeInHierarchy && Time.time - lastActivatedTime >= 0.1f) {
                SetKeyboardActive(false);
            }
        }

        // Assign the AttachedKeyboard variable when adding the component to a GameObject for the first time
        void Reset() {
            var keyboard = GameObject.FindObjectOfType<VRKeyboard>();
            if(keyboard) {
                AttachedKeyboard = keyboard;
                Debug.Log("Found and attached Keyboard to " + AttachedKeyboard.transform.name);
            }
        }
    }
}