/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "ags/shared/ac/common.h" // quit
#include "ags/shared/game/room_file.h"
#include "ags/shared/game/room_struct.h"
#include "ags/shared/gfx/bitmap.h"

namespace AGS3 {
namespace AGS {
namespace Shared {

RoomOptions::RoomOptions()
	: StartupMusic(0)
	, SaveLoadDisabled(false)
	, PlayerCharOff(false)
	, PlayerView(0)
	, MusicVolume(kRoomVolumeNormal)
	, Flags(0) {
}

RoomBgFrame::RoomBgFrame()
	: IsPaletteShared(false) {
	memset(Palette, 0, sizeof(Palette));
}

RoomEdges::RoomEdges()
	: Left(0)
	, Right(0)
	, Top(0)
	, Bottom(0) {
}

RoomEdges::RoomEdges(int l, int r, int t, int b)
	: Left(l)
	, Right(r)
	, Top(t)
	, Bottom(b) {
}

RoomObjectInfo::RoomObjectInfo()
	: Sprite(0)
	, X(0)
	, Y(0)
	, Room(-1)
	, IsOn(false)
	, Baseline(0xFF)
	, Flags(0) {
}

RoomRegion::RoomRegion()
	: Light(0)
	, Tint(0) {
}

WalkArea::WalkArea()
	: CharacterView(0)
	, ScalingFar(0)
	, ScalingNear(NOT_VECTOR_SCALED)
	, PlayerView(0)
	, Top(-1)
	, Bottom(-1) {
}

WalkBehind::WalkBehind()
	: Baseline(0) {
}

MessageInfo::MessageInfo()
	: DisplayAs(0)
	, Flags(0) {
}

RoomStruct::RoomStruct() {
	InitDefaults();
}

RoomStruct::~RoomStruct() {
	Free();
}

void RoomStruct::Free() {
	for (size_t i = 0; i < (size_t)MAX_ROOM_BGFRAMES; ++i)
		BgFrames[i].Graphic.reset();
	HotspotMask.reset();
	RegionMask.reset();
	WalkAreaMask.reset();
	WalkBehindMask.reset();

	LocalVariables.clear();
	Interaction.reset();
	Properties.clear();
	for (size_t i = 0; i < (size_t)MAX_ROOM_HOTSPOTS; ++i) {
		Hotspots[i].Interaction.reset();
		Hotspots[i].Properties.clear();
	}
	Objects.clear();
	for (size_t i = 0; i < (size_t)MAX_ROOM_REGIONS; ++i) {
		Regions[i].Interaction.reset();
		Regions[i].Properties.clear();
	}

	FreeMessages();
	FreeScripts();
}

void RoomStruct::FreeMessages() {
	for (size_t i = 0; i < MessageCount; ++i) {
		Messages[i].Free();
		MessageInfos[i] = MessageInfo();
	}
	MessageCount = 0;
}

void RoomStruct::FreeScripts() {
	CompiledScript.reset();

	EventHandlers.reset();
	for (size_t i = 0; i < HotspotCount; ++i)
		Hotspots[i].EventHandlers.reset();
	for (auto &obj : Objects)
		obj.EventHandlers.reset();
	for (size_t i = 0; i < RegionCount; ++i)
		Regions[i].EventHandlers.reset();
}

void RoomStruct::InitDefaults() {
	DataVersion = kRoomVersion_Current;
	GameID = NO_GAME_ID_IN_ROOM_FILE;

	_resolution = kRoomRealRes;
	MaskResolution = 1;
	Width = 320;
	Height = 200;

	Options = RoomOptions();
	Edges = RoomEdges(0, 317, 40, 199);

	BgFrameCount = 1;
	HotspotCount = 0;
	RegionCount = 0;
	WalkAreaCount = 0;
	WalkBehindCount = 0;
	MessageCount = 0;

	for (size_t i = 0; i < (size_t)MAX_ROOM_HOTSPOTS; ++i)
		Hotspots[i] = RoomHotspot();
	for (size_t i = 0; i < (size_t)MAX_ROOM_REGIONS; ++i)
		Regions[i] = RoomRegion();
	for (size_t i = 0; i < (size_t)MAX_WALK_AREAS; ++i)
		WalkAreas[i] = WalkArea();
	for (size_t i = 0; i < (size_t)MAX_WALK_BEHINDS; ++i)
		WalkBehinds[i] = WalkBehind();

	BackgroundBPP = 1;
	BgAnimSpeed = 5;

	memset(Palette, 0, sizeof(Palette));
}

void RoomStruct::SetResolution(RoomResolutionType type) {
	_resolution = type;
}

Bitmap *RoomStruct::GetMask(RoomAreaMask mask) const {
	switch (mask) {
	case kRoomAreaHotspot: return HotspotMask.get();
	case kRoomAreaWalkBehind: return WalkBehindMask.get();
	case kRoomAreaWalkable: return WalkAreaMask.get();
	case kRoomAreaRegion: return RegionMask.get();
	default: return nullptr;
	}
}

float RoomStruct::GetMaskScale(RoomAreaMask mask) const {
	switch (mask) {
	case kRoomAreaWalkBehind: return 1.f; // walk-behinds always 1:1 with room size
	case kRoomAreaHotspot:
	case kRoomAreaWalkable:
	case kRoomAreaRegion:
		return 1.f / MaskResolution;
	default:
		return 0.f;
	}
}

bool RoomStruct::HasRegionLightLevel(int id) const {
	if (id >= 0 && id < MAX_ROOM_REGIONS)
		return Regions[id].Tint == 0;
	return false;
}

bool RoomStruct::HasRegionTint(int id) const {
	if (id >= 0 && id < MAX_ROOM_REGIONS)
		return Regions[id].Tint != 0;
	return false;
}

int RoomStruct::GetRegionLightLevel(int id) const {
	if (id >= 0 && id < MAX_ROOM_REGIONS)
		return HasRegionLightLevel(id) ? Regions[id].Light : 0;
	return 0;
}

int RoomStruct::GetRegionTintLuminance(int id) const {
	if (id >= 0 && id < MAX_ROOM_REGIONS)
		return HasRegionTint(id) ? (Regions[id].Light * 10) / 25 : 0;
	return 0;
}

void load_room(const String &filename, RoomStruct *room, bool game_is_hires, const std::vector<SpriteInfo> &sprinfos) {
	room->Free();
	room->InitDefaults();

	RoomDataSource src;
	HRoomFileError err = OpenRoomFileFromAsset(filename, src);
	if (err) {
		err = ReadRoomData(room, src.InputStream.get(), src.DataVersion);
		if (err)
			err = UpdateRoomData(room, src.DataVersion, game_is_hires, sprinfos);
	}
	if (!err)
		quitprintf("Unable to load the room file '%s'.\n%s.", filename.GetCStr(), err->FullMessage().GetCStr());
}

PBitmap FixBitmap(PBitmap bmp, int width, int height) {
	Bitmap *new_bmp = BitmapHelper::AdjustBitmapSize(bmp.get(), width, height);
	if (new_bmp != bmp.get())
		return PBitmap(new_bmp);
	return bmp;
}

void UpscaleRoomBackground(RoomStruct *room, bool game_is_hires) {
	if (room->DataVersion >= kRoomVersion_303b || !game_is_hires)
		return;
	for (size_t i = 0; i < room->BgFrameCount; ++i)
		room->BgFrames[i].Graphic = FixBitmap(room->BgFrames[i].Graphic, room->Width, room->Height);
	FixRoomMasks(room);
}

void FixRoomMasks(RoomStruct *room) {
	if (room->MaskResolution <= 0)
		return;
	Bitmap *bkg = room->BgFrames[0].Graphic.get();
	if (bkg == nullptr)
		return;
	// TODO: this issue is somewhat complicated. Original code was relying on
	// room->Width and Height properties. But in the engine these are saved
	// already converted to data resolution which may be "low-res". Since this
	// function is shared between engine and editor we do not know if we need
	// to upscale them.
	// For now room width/height is always equal to background bitmap.
	int base_width = bkg->GetWidth();
	int base_height = bkg->GetHeight();
	int low_width = base_width / room->MaskResolution;
	int low_height = base_height / room->MaskResolution;

	// Walk-behinds are always 1:1 of the primary background.
	// Other masks are 1:x where X is MaskResolution.
	room->WalkBehindMask = FixBitmap(room->WalkBehindMask, base_width, base_height);
	room->HotspotMask = FixBitmap(room->HotspotMask, low_width, low_height);
	room->RegionMask = FixBitmap(room->RegionMask, low_width, low_height);
	room->WalkAreaMask = FixBitmap(room->WalkAreaMask, low_width, low_height);
}

} // namespace Shared
} // namespace AGS
} // namespace AGS3