/*****************************************************************************
 * Copyright (c) 2014-2020 OpenRCT2 developers
 *
 * For a complete list of all authors, please refer to contributors.md
 * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
 *
 * OpenRCT2 is licensed under the GNU General Public License version 3.
 *****************************************************************************/

#include "../../interface/Viewport.h"
#include "../../object/StationObject.h"
#include "../../paint/Paint.h"
#include "../../paint/Supports.h"
#include "../../world/Entity.h"
#include "../Track.h"
#include "../TrackPaint.h"
#include "../Vehicle.h"

enum
{
    PLANE_BACK,
    PLANE_FRONT,
};

enum
{
    SPR_MAGIC_CARPET_FRAME_NW = 22002,
    SPR_MAGIC_CARPET_FRAME_SE = 22003,
    SPR_MAGIC_CARPET_FRAME_NE = 22004,
    SPR_MAGIC_CARPET_FRAME_SW = 22005,
    SPR_MAGIC_CARPET_PENDULUM_NW = 22006,
    SPR_MAGIC_CARPET_PENDULUM_NE = 22038,
    SPR_MAGIC_CARPET_PENDULUM_SE = 22070,
    SPR_MAGIC_CARPET_PENDULUM_SW = 22102,
};

struct bound_box
{
    int16_t x;
    int16_t y;
    int16_t width;
    int16_t height;
};

/** rct2: 0x01428220 */
static constexpr const int16_t MagicCarpetOscillationZ[] = {
    -2, -1, 1, 5, 10, 16, 23, 30, 37, 45, 52, 59, 65, 70, 74, 76, 77, 76, 74, 70, 65, 59, 52, 45, 37, 30, 23, 16, 10, 5, 1, -1,
};

/** rct2: 0x01428260 */
static constexpr const int8_t MagicCarpetOscillationXY[] = {
    0, 6,  12,  18,  23,  27,  30,  31,  32,  31,  30,  27,  23,  18,  12,  6,
    0, -5, -11, -17, -22, -26, -29, -30, -31, -30, -29, -26, -22, -17, -11, -5,
};

/** rct2: 0x014281F0 */
static constexpr const bound_box MagicCarpetBounds[] = {
    { 0, 8, 32, 16 },
    { 8, 0, 16, 32 },
    { 0, 8, 32, 16 },
    { 8, 0, 16, 32 },
};

static const Vehicle* get_first_vehicle(const Ride* ride)
{
    if (ride->lifecycle_flags & RIDE_LIFECYCLE_ON_TRACK)
    {
        uint16_t vehicleSpriteIndex = ride->vehicles[0];
        if (vehicleSpriteIndex != SPRITE_INDEX_NULL)
        {
            return GetEntity<Vehicle>(vehicleSpriteIndex);
        }
    }
    return nullptr;
}

static void paint_magic_carpet_frame(
    paint_session* session, uint8_t plane, uint8_t direction, const CoordsXYZ& offset, const CoordsXYZ& bbOffset,
    const CoordsXYZ& bbSize)
{
    uint32_t imageId;
    if (direction & 1)
    {
        imageId = plane == PLANE_BACK ? SPR_MAGIC_CARPET_FRAME_NE : SPR_MAGIC_CARPET_FRAME_SW;
    }
    else
    {
        imageId = plane == PLANE_BACK ? SPR_MAGIC_CARPET_FRAME_NW : SPR_MAGIC_CARPET_FRAME_SE;
    }
    imageId |= session->TrackColours[SCHEME_TRACK];
    if (plane == PLANE_BACK)
    {
        PaintAddImageAsParent(session, imageId, offset, { bbSize.x, bbSize.y, 127 }, bbOffset);
    }
    else
    {
        PaintAddImageAsChild(
            session, imageId, static_cast<int8_t>(offset.x), static_cast<int8_t>(offset.y), bbSize.x, bbSize.y, 127, offset.z,
            bbOffset.x, bbOffset.y, bbOffset.z);
    }
}

static void paint_magic_carpet_pendulum(
    paint_session* session, uint8_t plane, uint32_t swingImageId, uint8_t direction, const CoordsXYZ& offset,
    const CoordsXYZ& bbOffset, const CoordsXYZ& bbSize)
{
    uint32_t imageId = swingImageId;
    if (direction & 2)
    {
        imageId = (0 - (static_cast<int32_t>(imageId))) & 31;
    }
    if (direction & 1)
    {
        imageId += plane == PLANE_BACK ? SPR_MAGIC_CARPET_PENDULUM_NE : SPR_MAGIC_CARPET_PENDULUM_SW;
    }
    else
    {
        imageId += plane == PLANE_BACK ? SPR_MAGIC_CARPET_PENDULUM_NW : SPR_MAGIC_CARPET_PENDULUM_SE;
    }
    imageId |= session->TrackColours[SCHEME_TRACK];
    PaintAddImageAsChild(
        session, imageId, static_cast<int8_t>(offset.x), static_cast<int8_t>(offset.y), bbSize.x, bbSize.y, 127, offset.z,
        bbOffset.x, bbOffset.y, bbOffset.z);
}

static void paint_magic_carpet_vehicle(
    paint_session* session, const Ride* ride, uint8_t direction, uint32_t swingImageId, CoordsXYZ offset,
    const CoordsXYZ& bbOffset, const CoordsXYZ& bbSize)
{
    rct_ride_entry* rideEntry = ride->GetRideEntry();
    uint32_t vehicleImageId = rideEntry->vehicles[0].base_image_id + direction;

    // Vehicle
    uint32_t imageColourFlags = session->TrackColours[SCHEME_MISC];
    if (imageColourFlags == IMAGE_TYPE_REMAP)
    {
        imageColourFlags = SPRITE_ID_PALETTE_COLOUR_2(ride->vehicle_colours[0].Body, ride->vehicle_colours[0].Trim);
    }

    int8_t directionalOffset = MagicCarpetOscillationXY[swingImageId];
    switch (direction)
    {
        case 0:
            offset.x -= directionalOffset;
            break;
        case 1:
            offset.y += directionalOffset;
            break;
        case 2:
            offset.x += directionalOffset;
            break;
        case 3:
            offset.y -= directionalOffset;
            break;
    }
    offset.z += MagicCarpetOscillationZ[swingImageId];

    PaintAddImageAsChild(
        session, vehicleImageId | imageColourFlags, static_cast<int8_t>(offset.x), static_cast<int8_t>(offset.y), bbSize.x,
        bbSize.y, 127, offset.z, bbOffset.x, bbOffset.y, bbOffset.z);

    // Riders
    rct_drawpixelinfo* dpi = &session->DPI;
    if (dpi->zoom_level <= 1 && (ride->lifecycle_flags & RIDE_LIFECYCLE_ON_TRACK))
    {
        auto* vehicle = get_first_vehicle(ride);
        if (vehicle != nullptr)
        {
            uint32_t baseImageId = IMAGE_TYPE_REMAP | IMAGE_TYPE_REMAP_2_PLUS | (vehicleImageId + 4);
            for (uint8_t peepIndex = 0; peepIndex < vehicle->num_peeps; peepIndex += 2)
            {
                uint32_t imageId = baseImageId + (peepIndex * 2);
                imageId |= (vehicle->peep_tshirt_colours[peepIndex + 0] << 19);
                imageId |= (vehicle->peep_tshirt_colours[peepIndex + 1] << 24);
                PaintAddImageAsChild(
                    session, imageId, static_cast<int8_t>(offset.x), static_cast<int8_t>(offset.y), bbSize.x, bbSize.y, 127,
                    offset.z, bbOffset.x, bbOffset.y, bbOffset.z);
            }
        }
    }
}

/** rct2: 0x00899104 */
static void paint_magic_carpet_structure(
    paint_session* session, const Ride* ride, uint8_t direction, int8_t axisOffset, uint16_t height)
{
    const TileElement* savedTileElement = static_cast<const TileElement*>(session->CurrentlyDrawnItem);
    auto* vehicle = get_first_vehicle(ride);

    uint32_t swingImageId = 0;
    if (vehicle != nullptr)
    {
        swingImageId = vehicle->Pitch;
        session->InteractionType = ViewportInteractionItem::Entity;
        session->CurrentlyDrawnItem = vehicle;
    }

    bound_box bb = MagicCarpetBounds[direction];
    CoordsXYZ offset, bbOffset, bbSize;
    offset.x = (direction & 1) ? 0 : axisOffset;
    offset.y = (direction & 1) ? axisOffset : 0;
    offset.z = height + 7;
    bbOffset.x = bb.x;
    bbOffset.y = bb.y;
    bbOffset.z = height + 7;
    bbSize.x = bb.width;
    bbSize.y = bb.height;
    bbSize.z = 127;

    paint_magic_carpet_frame(session, PLANE_BACK, direction, offset, bbOffset, bbSize);
    paint_magic_carpet_pendulum(session, PLANE_BACK, swingImageId, direction, offset, bbOffset, bbSize);
    paint_magic_carpet_vehicle(session, ride, direction, swingImageId, offset, bbOffset, bbSize);
    paint_magic_carpet_pendulum(session, PLANE_FRONT, swingImageId, direction, offset, bbOffset, bbSize);
    paint_magic_carpet_frame(session, PLANE_FRONT, direction, offset, bbOffset, bbSize);

    session->InteractionType = ViewportInteractionItem::Ride;
    session->CurrentlyDrawnItem = savedTileElement;
}

/** rct2: 0x00898514 */
static void paint_magic_carpet(
    paint_session* session, const Ride* ride, uint8_t trackSequence, uint8_t direction, int32_t height,
    const TrackElement& trackElement)
{
    uint8_t relativeTrackSequence = track_map_1x4[direction][trackSequence];

    // The end tiles do not have a platform
    switch (relativeTrackSequence)
    {
        case 0:
        case 2:
            if (direction & 1)
            {
                metal_a_supports_paint_setup(
                    session, METAL_SUPPORTS_TUBES, 6, 0, height, session->TrackColours[SCHEME_SUPPORTS]);
                metal_a_supports_paint_setup(
                    session, METAL_SUPPORTS_TUBES, 7, 0, height, session->TrackColours[SCHEME_SUPPORTS]);
            }
            else
            {
                metal_a_supports_paint_setup(
                    session, METAL_SUPPORTS_TUBES, 5, 0, height, session->TrackColours[SCHEME_SUPPORTS]);
                metal_a_supports_paint_setup(
                    session, METAL_SUPPORTS_TUBES, 8, 0, height, session->TrackColours[SCHEME_SUPPORTS]);
            }
            StationObject* stationObject = nullptr;
            if (ride != nullptr)
                stationObject = ride_get_station_object(ride);

            if (stationObject != nullptr && !(stationObject->Flags & STATION_OBJECT_FLAGS::NO_PLATFORMS))
            {
                uint32_t imageId = SPR_STATION_BASE_D | session->TrackColours[SCHEME_SUPPORTS];
                PaintAddImageAsParent(session, imageId, { 0, 0, height }, { 32, 32, 1 });
            }
            break;
    }

    if (ride != nullptr)
    {
        switch (relativeTrackSequence)
        {
            case 3:
                paint_magic_carpet_structure(session, ride, direction, -48, height);
                break;
            case 0:
                paint_magic_carpet_structure(session, ride, direction, -16, height);
                break;
            case 2:
                paint_magic_carpet_structure(session, ride, direction, 16, height);
                break;
            case 1:
                paint_magic_carpet_structure(session, ride, direction, 48, height);
                break;
        }
    }

    paint_util_set_segment_support_height(session, SEGMENTS_ALL, 0xFFFF, 0);
    paint_util_set_general_support_height(session, height + 176, 0x20);
}

/**
 *
 *  rct2: 0x00898384
 */
TRACK_PAINT_FUNCTION get_track_paint_function_magic_carpet(int32_t trackType)
{
    switch (trackType)
    {
        case TrackElemType::FlatTrack1x4A:
            return paint_magic_carpet;
    }
    return nullptr;
}
