using SO;
using SO.Channels;
using UnityEngine;
using UnityEngine.UIElements;
using Button = UnityEngine.UIElements.Button;

namespace UI
{
    public class MainMenuLayout : MonoBehaviour
    {    
        [SerializeField] private SimpleChannelSO nextButtonChannel;
        [SerializeField] private SimpleChannelSO previousButtonChannel;
        [SerializeField] private SimpleChannelSO videoButtonChannel;
        [SerializeField] private SimpleChannelSO documentButtonChannel;
        [SerializeField] private SimpleChannelSO animationButtonChannel;
        [SerializeField] private StepChangeChannelSO stepChangeChannel;
        [SerializeField] private MachineChangeChannelSO machineChannel;
        [SerializeField] private SimpleChannelSO playButtonChannel;
        [SerializeField] private SimpleChannelSO stopButtonChannel;
    
        [SerializeField] private VisualTreeAsset documentPanelAsset;
        [SerializeField] private VisualTreeAsset videoPanelAsset;
    
        private VisualElement switchingArea;
        private Button nextButton;
        private Button previousButton;
        private Button videoButton;
        private Button documentButton;
        private Button animationButton;

        private Label machineName;
        private Label processName;
        private Label stepName;
    
        private Label stepNameText;
        private Label stepDescriptionText;
    
        private VisualElement videoScreen;
        private VisualElement documentScreen;
        private VisualElement documentPanel;
        private Texture currentDocument;
    
        private Button playButton;
        private Button stopButton;

        private void OnEnable()
        {
            var root = GetComponent<UIDocument>().rootVisualElement;
            machineName = root.Q<Label>("MachineName");
            processName = root.Q<Label>("ProcessName");
            stepName = root.Q<Label>("StepName");
            stepNameText = root.Q<Label>("StepNameText");
            stepDescriptionText = root.Q<Label>("StepDescriptionText");
            switchingArea = root.Q<VisualElement>("SwitchingArea");
            nextButton = root.Q<Button>("NextButton");
            previousButton = root.Q<Button>("PreviousButton");
            videoButton = root.Q<Button>("VideoButton");
            documentButton = root.Q<Button>("DocumentButton");
            animationButton = root.Q<Button>("AnimationButton");

            videoScreen = videoPanelAsset.CloneTree();
            playButton = videoScreen.Q<Button>("PlayButton");
            stopButton = videoScreen.Q<Button>("StopButton");
        
            documentScreen = documentPanelAsset.CloneTree();
            documentPanel = documentScreen.Q<VisualElement>("DocumentPanel");

            nextButton.clicked += OnNextButtonClicked;
            previousButton.clicked += OnPreviousButtonClicked;
            videoButton.clicked += OnVideoButtonClicked;
            documentButton.clicked += OnDocumentButtonClicked;
            animationButton.clicked += OnAnimationButtonClicked;
        
            playButton.clicked += OnPlayButtonClicked;
            stopButton.clicked += OnStopButtonClicked;

            stepChangeChannel.OnStepChanged += OnStepChanged;
            machineChannel.OnMachineChange += OnMachineChanged;
            playButtonChannel.OnEventRaised += OnPlayButtonClicked;
            stopButtonChannel.OnEventRaised += OnStopButtonClicked;
        
            animationButtonChannel.OnEventRaised += OnAnimationButtonClicked;
        }


        private void OnDisable()
        {
            nextButton.clicked -= OnNextButtonClicked;
            previousButton.clicked -= OnPreviousButtonClicked;
            videoButton.clicked -= OnVideoButtonClicked;
            documentButton.clicked -= OnDocumentButtonClicked;
            animationButton.clicked -= OnAnimationButtonClicked;
        
            playButton.clicked -= OnPlayButtonClicked;
            stopButton.clicked -= OnStopButtonClicked;
        
            stepChangeChannel.OnStepChanged -= OnStepChanged;
            machineChannel.OnMachineChange -= OnMachineChanged;
            playButtonChannel.OnEventRaised -= OnPlayButtonClicked; 
            stopButtonChannel.OnEventRaised -= OnStopButtonClicked;
        
            animationButtonChannel.OnEventRaised -= OnAnimationButtonClicked;
        }

        private void OnMachineChanged(MachineSO machine)
        {
            machineName.text = machine.MachineName;
            processName.text = machine.Process.ProcessName;
            OnStepChanged(machine.Process.Steps[0]);
        }

        private void OnStepChanged(StepSO step)
        {
            stepName.text = step.StepName;
            stepNameText.text = step.StepName;
            stepDescriptionText.text = step.Description;
            currentDocument = step.Document;
        }

        private void OnNextButtonClicked()
        {
            switchingArea.Clear();
            nextButtonChannel.RaiseEvent();
        }
    
        private void OnPreviousButtonClicked()
        {
            switchingArea.Clear();
            previousButtonChannel.RaiseEvent();
        }
    
        private void OnVideoButtonClicked()
        {
            videoButtonChannel.RaiseEvent();
        
            if (switchingArea.childCount.Equals(0) || switchingArea.Contains(documentScreen))
            {
                switchingArea.Clear();
                switchingArea.Add(videoScreen);
                return;
            }
            switchingArea.Clear();
        }
    
        private void OnDocumentButtonClicked()
        {
            documentButtonChannel.RaiseEvent();
            if (switchingArea.childCount.Equals(0) || switchingArea.Contains(videoScreen))
            {
                switchingArea.Clear();
                switchingArea.Add(documentScreen);
            
                documentPanel.style.backgroundImage = new StyleBackground((Background)currentDocument);
            
                return;
            }
            switchingArea.Clear();
        }
    
        // Debugging, grabs all the children of the root element and prints them to the console
        private void InspectChildren(VisualElement element, int depth)
        {
            string indent = new string('\t', depth);
        
            Debug.Log($"{indent}Element: {element.name}");
            for (int i = 0; i < element.childCount; i++)
            {
                VisualElement child = element[i];
                InspectChildren(child, depth + 1);
            }
        }
    
        private void OnAnimationButtonClicked()
        {
            Debug.Log("triggered animation");
            animationButtonChannel.RaiseEvent();
            return;
        }
    
    
        private void OnStopButtonClicked()
        {
            Debug.Log("triggered");
            stopButtonChannel.RaiseEvent();
        }

        private void OnPlayButtonClicked()
        {
            playButtonChannel.RaiseEvent();
        }
    }
}