/*
* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
* its licensors.
*
* For complete copyright and license terms please see the LICENSE at the root of this
* distribution (the "License"). All use of this software is governed by the License,
* or, if provided, by the license below or the license accompanying this file. Do not
* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
*/

#pragma once

#include <AzCore/Component/TransformBus.h>
#include <AzCore/Math/Aabb.h>
#include <AzCore/Math/Obb.h>
#include <LmbrCentral/Shape/ShapeComponentBus.h>
#include <LmbrCentral/Shape/BoxShapeComponentBus.h>

namespace AzFramework
{
    class DebugDisplayRequests;
}

namespace LmbrCentral
{
    struct ShapeDrawParams;

    class BoxShape
        : public ShapeComponentRequestsBus::Handler
        , public BoxShapeComponentRequestsBus::Handler
        , public AZ::TransformNotificationBus::Handler
    {
    public:
        AZ_CLASS_ALLOCATOR(BoxShape, AZ::SystemAllocator, 0)
        AZ_RTTI(BoxShape, "{36D1BA94-13CF-433F-B1FE-28BEBBFE20AA}")

        static void Reflect(AZ::ReflectContext* context);

        void Activate(AZ::EntityId entityId);
        void Deactivate();
        void InvalidateCache(InvalidateShapeCacheReason reason);

        // ShapeComponentRequestsBus::Handler
        AZ::Crc32 GetShapeType() override { return AZ_CRC("Box", 0x08a9483a); }
        AZ::Aabb GetEncompassingAabb() override;
        void GetTransformAndLocalBounds(AZ::Transform& transform, AZ::Aabb& bounds) override;
        bool IsPointInside(const AZ::Vector3& point) override;
        float DistanceSquaredFromPoint(const AZ::Vector3& point) override;
        AZ::Vector3 GenerateRandomPointInside(AZ::RandomDistributionType randomDistribution) override;
        bool IntersectRay(const AZ::Vector3& src, const AZ::Vector3& dir, AZ::VectorFloat& distance) override;

        // BoxShapeComponentRequestBus::Handler
        BoxShapeConfig GetBoxConfiguration() override { return m_boxShapeConfig; }
        AZ::Vector3 GetBoxDimensions() override { return m_boxShapeConfig.m_dimensions; }
        void SetBoxDimensions(const AZ::Vector3& dimensions) override;

        // AZ::TransformNotificationBus::Handler
        void OnTransformChanged(const AZ::Transform& local, const AZ::Transform& world) override;

        const BoxShapeConfig& GetBoxConfiguration() const { return m_boxShapeConfig; }
        void SetBoxConfiguration(const BoxShapeConfig& boxShapeConfig) { m_boxShapeConfig = boxShapeConfig; }
        const AZ::Transform& GetCurrentTransform() const { return m_currentTransform; }

        void SetDrawColor(const AZ::Color& color) { m_boxShapeConfig.SetDrawColor(color); }

    protected:

        friend class EditorBoxShapeComponent;        
        BoxShapeConfig& ModifyConfiguration() { return m_boxShapeConfig; }

    private:
        /// Runtime data - cache potentially expensive operations.
        class BoxIntersectionDataCache
            : public IntersectionTestDataCache<BoxShapeConfig>
        {
            void UpdateIntersectionParamsImpl(
                const AZ::Transform& currentTransform, const BoxShapeConfig& configuration) override;

            friend BoxShape;

            AZ::Aabb m_aabb; ///< Aabb representing this Box.
            AZ::Obb m_obb; ///< Obb representing this Box.
            AZ::Vector3 m_currentPosition; ///< Position of the Box.
            AZ::Vector3 m_dimensions; ///< Dimensions of Box (including entity scale).
            bool m_axisAligned = true; ///< Indicates whether the box is axis or object aligned.
        };

        BoxShapeConfig m_boxShapeConfig; ///< Underlying box configuration.
        BoxIntersectionDataCache m_intersectionDataCache; ///< Caches transient intersection data.
        AZ::Transform m_currentTransform; ///< Caches the current transform for the entity on which this component lives.
        AZ::EntityId m_entityId; ///< Id of the entity the box shape is attached to.
    };

    void DrawBoxShape(
        const ShapeDrawParams& shapeDrawParams, const BoxShapeConfig& boxShapeConfig,
        AzFramework::DebugDisplayRequests& debugDisplay);

} // namespace LmbrCentral