/*
 * Copyright (c) Contributors to the Open 3D Engine Project.
 * For complete copyright and license terms please see the LICENSE at the root of this distribution.
 *
 * SPDX-License-Identifier: Apache-2.0 OR MIT
 *
 */
#pragma once

#include <QAbstractItemModel>
#include <QListView>
#include <AzFramework/Components/CameraBus.h>
#include <AzCore/Component/EntityBus.h>
#include <AzToolsFramework/Entity/EditorEntityContextBus.h>
#include <AzToolsFramework/API/ToolsApplicationAPI.h>
#include <AzCore/Component/ComponentApplicationBus.h>
#include <AzToolsFramework/API/EditorCameraBus.h>

namespace Camera
{
    namespace Internal
    {
        //! Each item in the list holds the camera's entityId and name.
        struct CameraListItem
            : public AZ::EntityBus::Handler
        {
        public:
            explicit CameraListItem(AZ::EntityId cameraId);
            ~CameraListItem();

            void OnEntityNameChanged(const AZStd::string& name) override { m_cameraName = name; }

            bool operator<(const CameraListItem& rhs) const;

            AZ::EntityId m_cameraId;
            AZStd::string m_cameraName;
        };

        // holds a list of camera items
        struct CameraListModel
            : public QAbstractListModel
            , public CameraNotificationBus::Handler
        {
        public:
            explicit CameraListModel(QWidget* myParent);
            ~CameraListModel();

            // QAbstractItemModel interface
            int rowCount(const QModelIndex& parent = QModelIndex()) const override;
            QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;

            // CameraNotificationBus interface
            void OnCameraAdded(const AZ::EntityId& cameraId) override;
            void OnCameraRemoved(const AZ::EntityId& cameraId) override;

            void ConnectCameraNotificationBus();
            void DisconnecCameraNotificationBus();

            QModelIndex GetIndexForEntityId(const AZ::EntityId entityId);

            void Reset();

        private:
            AZStd::vector<CameraListItem> m_cameraItems;
            AZ::EntityId m_sequenceCameraEntityId;
            AZ::EntityId m_lastActiveCamera;
        };

        struct ViewportCameraSelectorWindow
            : public QListView
            , public EditorCameraNotificationBus::Handler
            , public AzToolsFramework::EditorEntityContextNotificationBus::Handler
        {
        public:
            ViewportCameraSelectorWindow(QWidget* parent = nullptr);
            ~ViewportCameraSelectorWindow();

            void currentChanged(const QModelIndex& current, const QModelIndex& previous) override;

            // EditorCameraNotificationBus overrides ...
            void OnViewportViewEntityChanged(const AZ::EntityId& newViewId) override;

            // AzToolsFramework::EditorEntityContextNotificationBus overrides ...
            void OnStartPlayInEditorBegin() override;
            void OnStopPlayInEditor() override;
            void OnPrepareForContextReset() override;
            void OnContextReset() override;

            // QListView overrides ...
            void mouseDoubleClickEvent(QMouseEvent* event) override;
            QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) override;

            QModelIndex GetPreviousIndex() const;
            QModelIndex GetNextIndex() const;

        private:
            CameraListModel* m_cameraList = nullptr;
            bool m_ignoreViewportViewEntityChanged = false;
        };

        //! Wrapper for the ViewportCameraSelectorWindow so that we can add some descriptive helpful text.
        struct ViewportSelectorHolder
            : public QWidget
        {
            explicit ViewportSelectorHolder(QWidget* parent = nullptr);
        };

        //! Factory method for ViewportSelectorHolder.
        ViewportSelectorHolder* CreateNewSelectionWindow(QWidget* parent = nullptr);
    } // namespace Camera::Internal
} // namespace Camera