using Content.Client.Resources;
using Content.Client.Stylesheets;
using Content.Client.UserInterface.Controls;
using Content.Shared.Access;
using Content.Shared.Access.Systems;
using Content.Shared.TurretController;
using Content.Shared.Turrets;
using Robust.Client.AutoGenerated;
using Robust.Client.Player;
using Robust.Client.ResourceManagement;
using Robust.Client.UserInterface.Controls;
using Robust.Client.UserInterface.CustomControls;
using Robust.Client.UserInterface.XAML;
using Robust.Shared.Player;
using Robust.Shared.Prototypes;
using System.Linq;
using System.Numerics;

namespace Content.Client.TurretController;

[GenerateTypedNameReferences]
public sealed partial class TurretControllerWindow : BaseWindow
{
    [Dependency] private IEntityManager _entManager = default!;
    [Dependency] private IPrototypeManager _protoManager = default!;
    [Dependency] private IPlayerManager _playerManager = default!;

    private readonly IResourceCache _cache;
    private readonly AccessReaderSystem _accessReaderSystem;

    private EntityUid? _owner;
    private int _tabIndex = 0;

    // Button groups
    private readonly ButtonGroup _armamentButtons = new();
    private readonly ButtonGroup _accessGroupsButtons = new();

    // Temp values
    private List<CheckBox> _checkBoxes = new();
    private HashSet<AccessLevelPrototype> _accessLevelsForTab = new();
    private List<AccessLevelEntry> _accessLevelEntries = new();

    // Events
    private event Action<int>? OnAccessGroupChangedEvent;

    public event Action<HashSet<ProtoId<AccessLevelPrototype>>, bool>? OnAccessLevelsChangedEvent;
    public event Action<int>? OnArmamentSettingChangedEvent;

    // Colors
    private Color[] _themeColors = [Color.FromHex("#33e633"), Color.FromHex("#dfb827"), Color.FromHex("#da2a2a")];

    public TurretControllerWindow()
    {
        RobustXamlLoader.Load(this);
        IoCManager.InjectDependencies(this);

        _cache = IoCManager.Resolve<IResourceCache>();
        _accessReaderSystem = _entManager.System<AccessReaderSystem>();

        CloseButton.OnPressed += _ => Close();
        XamlChildren = ContentsContainer.Children;

        OnAccessGroupChangedEvent += OnAccessGroupChanged;

        var smallFont = _cache.NotoStack(size: 8);
        Footer.FontOverride = smallFont;
    }

    private void Initialize()
    {
        if (_owner == null)
            return;

        // Set up armament buttons
        SafeButton.OnToggled += args => OnArmamentButtonPressed(SafeButton, -1);
        StunButton.OnToggled += args => OnArmamentButtonPressed(StunButton, 0);
        LethalButton.OnToggled += args => OnArmamentButtonPressed(LethalButton, 1);

        SafeButton.Group = _armamentButtons;
        StunButton.Group = _armamentButtons;
        LethalButton.Group = _armamentButtons;

        SafeButton.Label.AddStyleClass("ConsoleText");
        StunButton.Label.AddStyleClass("ConsoleText");
        LethalButton.Label.AddStyleClass("ConsoleText");

        // Refresh UI
        RefreshLinkedTurrets(new());

        if (_entManager.TryGetComponent<DeployableTurretControllerComponent>(_owner, out var turretController))
            UpdateTheme(turretController.ArmamentState);

        if (_entManager.TryGetComponent<TurretTargetSettingsComponent>(_owner, out var turretTargetSettings))
            RefreshAccessControls(turretTargetSettings.ExemptAccessLevels);
    }

    private void OnArmamentButtonPressed(Button pressedButton, int index)
    {
        UpdateTheme(index);
        OnArmamentSettingChangedEvent?.Invoke(index);
    }

    private void UpdateTheme(int index)
    {
        switch (index)
        {
            case -1:
                SafeButton.Pressed = true;
                break;
            case 0:
                StunButton.Pressed = true;
                break;
            case 1:
                LethalButton.Pressed = true;
                break;
        }

        var canInteract = IsLocalPlayerAllowedToInteract();

        SafeButton.Disabled = !SafeButton.Pressed && !canInteract;
        StunButton.Disabled = !StunButton.Pressed && !canInteract;
        LethalButton.Disabled = !LethalButton.Pressed && !canInteract;

        var shiftedIndex = index + 1;

        if (shiftedIndex >= 0 && shiftedIndex < _themeColors.Length)
            ContentsContainer.Modulate = _themeColors[shiftedIndex];
    }

    public void SetOwner(EntityUid owner)
    {
        _owner = owner;

        Initialize();
    }

    public void UpdateState(DeployableTurretControllerBoundInterfaceState state)
    {
        if (_entManager.TryGetComponent<DeployableTurretControllerComponent>(_owner, out var turretController))
            UpdateTheme(turretController.ArmamentState);

        if (_entManager.TryGetComponent<TurretTargetSettingsComponent>(_owner, out var turretTargetSettings))
            RefreshAccessControls(turretTargetSettings.ExemptAccessLevels);

        RefreshLinkedTurrets(state.TurretStates);
    }

    public void UpdateMessage(DeployableTurretControllerBoundInterfaceMessage message)
    {
        RefreshLinkedTurrets(message.TurretStates);
    }

    public void RefreshLinkedTurrets(List<(string, string)> turretStates)
    {
        var turretCount = turretStates.Count;
        var hasTurrets = turretCount > 0;

        NoLinkedTurretsText.Visible = !hasTurrets;
        LinkedTurretsContainer.Visible = hasTurrets;

        LinkedTurretsContainer.RemoveAllChildren();

        foreach (var turretState in turretStates)
        {
            var box = new BoxContainer()
            {
                HorizontalExpand = true,
            };

            var label = new Label()
            {
                Text = Loc.GetString("turret-controls-window-turret-status", ("device", turretState.Item1), ("status", Loc.GetString(turretState.Item2))),
                HorizontalAlignment = HAlignment.Left,
                Margin = new Thickness(10f, 0f, 10f, 0f),
                HorizontalExpand = true,
                SetHeight = 20f,
            };

            label.AddStyleClass("ConsoleText");

            box.AddChild(label);
            LinkedTurretsContainer.AddChild(box);
        }

        TurretStatusHeader.Text = Loc.GetString("turret-controls-window-turret-status-label", ("count", turretCount));
    }

    public void RefreshAccessControls(HashSet<ProtoId<AccessLevelPrototype>> exemptAccessLevels)
    {
        if (_owner == null)
            return;

        if (!_entManager.TryGetComponent<DeployableTurretControllerComponent>(_owner, out var turretControls))
            return;

        var canInteract = IsLocalPlayerAllowedToInteract();

        // Create a list of known access groups with which to populate the UI
        var groupedAccessLevels = new Dictionary<AccessGroupPrototype, HashSet<AccessLevelPrototype>>();

        foreach (var accessGroup in turretControls.AccessGroups)
        {
            if (!_protoManager.TryIndex(accessGroup, out var accessGroupProto))
                continue;

            groupedAccessLevels.Add(accessGroupProto, new());
        }

        // Ensure that the 'general' access group is added to handle
        // misc. access levels that aren't associated with any group
        if (_protoManager.TryIndex<AccessGroupPrototype>("General", out var generalAccessProto))
            groupedAccessLevels.TryAdd(generalAccessProto, new());

        // Assign known access levels with their associated groups
        foreach (var accessLevel in turretControls.AccessLevels)
        {
            if (!_protoManager.TryIndex(accessLevel, out var accessLevelProto))
                continue;

            IEnumerable<AccessGroupPrototype> associatedGroups =
                groupedAccessLevels.Keys.Where(x => x.Tags.Contains(accessLevelProto.ID) == true);

            if (!associatedGroups.Any() && generalAccessProto != null)
                groupedAccessLevels[generalAccessProto].Add(accessLevelProto);

            else
            {
                foreach (var group in associatedGroups)
                    groupedAccessLevels[group].Add(accessLevelProto);
            }
        }

        // Remove access groups that have no assigned access levels
        foreach (var (group, accessLevels) in groupedAccessLevels)
        {
            if (accessLevels.Count == 0)
                groupedAccessLevels.Remove(group);
        }

        // Did something go wrong...?
        if (groupedAccessLevels.Count == 0)
        {
            AccessGroupList.DisposeAllChildren();
            AccessLevelGrid.DisposeAllChildren();

            return;
        }

        // Adjust the current tab index so it remains in range
        if (_tabIndex >= groupedAccessLevels.Count)
            _tabIndex = groupedAccessLevels.Count - 1;

        // Reorder the access groups alphabetically
        var orderedAccessGroups = groupedAccessLevels.Keys.OrderBy(x => x.GetAccessGroupName()).ToList();

        // Remove excess group access buttons from the UI
        while (AccessGroupList.ChildCount > orderedAccessGroups.Count)
            AccessGroupList.RemoveChild(orderedAccessGroups.Count - 1);

        // Add missing group access buttons to the UI
        while (AccessGroupList.ChildCount < orderedAccessGroups.Count)
        {
            var monotoneButton = new MonotoneButton
            {
                ToggleMode = true,
            };

            AccessGroupList.AddChild(monotoneButton);

            // Add button styling
            monotoneButton.Label.AddStyleClass("ConsoleText");
            monotoneButton.Label.HorizontalAlignment = HAlignment.Left;

            monotoneButton.Group = _accessGroupsButtons;

            var childIndex = AccessGroupList.ChildCount - 1;

            if (orderedAccessGroups.Count > 1)
            {
                if (childIndex == 0)
                    monotoneButton.Shape = MonotoneButtonShape.OpenLeft;

                else if (orderedAccessGroups.Count > 1 && childIndex == (orderedAccessGroups.Count - 1))
                    monotoneButton.Shape = MonotoneButtonShape.OpenRight;

                else
                    monotoneButton.Shape = MonotoneButtonShape.OpenBoth;
            }

            // Add button events
            monotoneButton.OnPressed += _ =>
            {
                OnAccessGroupChangedEvent?.Invoke(monotoneButton.GetPositionInParent());
            };
        }

        // Update the group access buttons
        for (int i = 0; i < orderedAccessGroups.Count; i++)
        {
            if (AccessGroupList.GetChild(i) is not Button { } accessGroupButton)
                continue;

            var accessGroup = orderedAccessGroups[i];
            var prefix = groupedAccessLevels[accessGroup].Any(x => exemptAccessLevels.Contains(x)) ? "»" : " ";

            accessGroupButton.Text = Loc.GetString("turret-controls-window-access-group-label",
                ("prefix", prefix), ("label", accessGroup.GetAccessGroupName()));

            accessGroupButton.Pressed = _tabIndex == orderedAccessGroups.IndexOf(accessGroup);
        }

        // Get the access levels associated with the current tab
        _accessLevelsForTab = groupedAccessLevels[orderedAccessGroups[_tabIndex]];
        _accessLevelsForTab = _accessLevelsForTab.OrderBy(x => x.GetAccessLevelName()).ToHashSet();

        // Remove excess access level buttons from the UI
        // Note: if _accessLevelsForTab is length 'n', AccessLevelGrid should have 'n + 1' children at the end
        while (AccessLevelGrid.ChildCount > (_accessLevelsForTab.Count + 1))
        {
            var index = AccessLevelGrid.ChildCount - 1;

            if (AccessLevelGrid.GetChild(AccessLevelGrid.ChildCount - 1) is AccessLevelEntry { } accessLevelEntry)
                _accessLevelEntries.Remove(accessLevelEntry);

            AccessLevelGrid.RemoveChild(index);
        }

        // Add an 'all' checkbox as the first child of the list if it hasn't been initalized yet
        // Toggling this checkbox on will mark all other boxes below it on/off
        if (AccessLevelGrid.ChildCount == 0)
        {
            var checkBox = new MonotoneCheckBox
            {
                Text = Loc.GetString("turret-controls-window-all-checkbox"),
                Margin = new Thickness(0, 0, 0, 3),
                ToggleMode = true,
                ReservesSpace = false,
            };

            AccessLevelGrid.AddChild(checkBox);

            // Add checkbox styling
            checkBox.Label.AddStyleClass("ConsoleText");

            // Add checkbox events
            checkBox.OnPressed += args =>
            {
                SetCheckBoxPressedState(_checkBoxes, checkBox.Pressed);

                var accessLevels = new HashSet<ProtoId<AccessLevelPrototype>>();

                foreach (var accessLevel in _accessLevelsForTab)
                    accessLevels.Add(accessLevel);

                OnAccessLevelsChangedEvent?.Invoke(accessLevels, checkBox.Pressed);
            };
        }

        // Hide the 'all' checkbox if the tab has only one access level
        var allCheckBoxVisible = _accessLevelsForTab.Count > 1;

        // Did something go wrong...?
        if (AccessLevelGrid.GetChild(0) is not CheckBox { } allCheckBox)
            return;

        allCheckBox.Visible = allCheckBoxVisible;
        allCheckBox.Disabled = !canInteract;

        // Add any remaining missing access level buttons to the UI
        while (AccessLevelGrid.ChildCount < (_accessLevelsForTab.Count + 1))
        {
            var accessLevelEntry = new AccessLevelEntry();
            AccessLevelGrid.AddChild(accessLevelEntry);

            _accessLevelEntries.Add(accessLevelEntry);

            // Add checkbox events
            accessLevelEntry.CheckBox.OnPressed += args =>
            {
                // If the checkbox and its siblings are checked, check the 'all' checkbox too
                allCheckBox.Pressed = AreAllCheckBoxesPressed(_accessLevelEntries.Select(x => (CheckBox)x.CheckBox));

                OnAccessLevelsChangedEvent?.Invoke
                    (new HashSet<ProtoId<AccessLevelPrototype>>() { accessLevelEntry.AccessLevel }, accessLevelEntry.CheckBox.Pressed);
            };
        }

        // Update the access levels buttons' appearance
        for (int i = 0; i < _accessLevelEntries.Count; i++)
        {
            var accessLevel = _accessLevelsForTab.ElementAt(i);
            var accessLevelEntry = _accessLevelEntries[i];

            accessLevelEntry.AccessLevel = accessLevel;
            accessLevelEntry.CheckBox.Text = accessLevel.GetAccessLevelName();
            accessLevelEntry.CheckBox.Pressed = exemptAccessLevels.Contains(accessLevel);

            var isEndOfList = i == (_accessLevelEntries.Count - 1);

            var lines = new List<(Vector2, Vector2)>()
            {
                (new Vector2(0.5f, 0f), new Vector2(0.5f, isEndOfList ? 0.5f : 1f)),
                (new Vector2(0.5f, 0.5f), new Vector2(1f, 0.5f)),
            };

            accessLevelEntry.UpdateCheckBoxLink(lines);
            accessLevelEntry.CheckBoxLink.Visible = allCheckBoxVisible;
            accessLevelEntry.CheckBoxLink.Modulate = !canInteract ? Color.Gray : Color.White;

            accessLevelEntry.CheckBox.Disabled = !canInteract;
        }

        // Press the 'all' checkbox if all others are pressed
        allCheckBox.Pressed = AreAllCheckBoxesPressed(_accessLevelEntries.Select(x => x.CheckBox));
    }


    private bool AreAllCheckBoxesPressed(IEnumerable<CheckBox> checkBoxes)
    {
        foreach (var checkBox in checkBoxes)
        {
            if (!checkBox.Pressed)
                return false;
        }

        return true;
    }

    private void SetCheckBoxPressedState(IEnumerable<CheckBox> checkBoxes, bool pressed)
    {
        foreach (var checkBox in checkBoxes)
            checkBox.Pressed = pressed;
    }

    protected override DragMode GetDragModeFor(Vector2 relativeMousePos)
    {
        return DragMode.Move;
    }

    private void OnAccessGroupChanged(int newTabIndex)
    {
        if (newTabIndex == _tabIndex)
            return;

        _tabIndex = newTabIndex;

        if (_entManager.TryGetComponent<TurretTargetSettingsComponent>(_owner, out var turretTargetSettings))
            RefreshAccessControls(turretTargetSettings.ExemptAccessLevels);
    }

    private bool IsLocalPlayerAllowedToInteract()
    {
        if (_owner == null || _playerManager.LocalSession?.AttachedEntity == null)
            return false;

        return _accessReaderSystem.IsAllowed(_playerManager.LocalSession.AttachedEntity.Value, _owner.Value);
    }

    private sealed class AccessLevelEntry : BoxContainer
    {
        public ProtoId<AccessLevelPrototype> AccessLevel = default!;
        public MonotoneCheckBox CheckBox;
        public LineRenderer CheckBoxLink;

        public AccessLevelEntry()
        {
            HorizontalExpand = true;

            var lines = new List<(Vector2, Vector2)>()
            {
                (new Vector2(0,0), new Vector2(0,0)),
                (new Vector2(0,0), new Vector2(0,0))
            };

            CheckBoxLink = new LineRenderer(lines)
            {
                SetWidth = 22,
                VerticalExpand = true,
                Margin = new Thickness(0, -1),
                ReservesSpace = false,
            };

            AddChild(CheckBoxLink);

            CheckBox = new MonotoneCheckBox
            {
                ToggleMode = true,
                Margin = new Thickness(0f, 0f, 0f, 3f),
            };

            AddChild(CheckBox);

            CheckBox.Label.AddStyleClass("ConsoleText");
        }

        public void UpdateCheckBoxLink(List<(Vector2, Vector2)> lines)
        {
            CheckBoxLink.Lines = lines;
        }
    }
}