/* 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */


#include "graphics.h"
#include "disk.h"

#include "common/algorithm.h"
#include "common/textconsole.h"
#include "parallaction/parallaction.h"

namespace Parallaction {

GfxObj::GfxObj(uint objType, Frames *frames, const char* name) :
	_frames(frames), x(0), y(0), z(0), _prog(0), _flags(0),
	type(objType), frame(0), layer(3), scale(100), _hasMask(false), _hasPath(false),
	transparentKey(0), _maskId(0), _pathId(0) {

	if (name) {
		_name = strdup(name);
	} else {
		_name = 0;
	}
}

GfxObj::~GfxObj() {
	delete _frames;
	free(_name);
}

void GfxObj::release() {
//	_keep = false;
	delete this;
}

const char *GfxObj::getName() const {
	return _name;
}

uint GfxObj::getNum() {
	return _frames->getNum();
}

void GfxObj::getRect(uint f, Common::Rect &r) {
	_frames->getRect(f, r);
}

byte *GfxObj::getData(uint f) {
	return _frames->getData(f);
}

uint GfxObj::getRawSize(uint f) {
	return _frames->getRawSize(f);
}
uint GfxObj::getSize(uint f) {
	return _frames->getSize(f);
}

void GfxObj::setFlags(uint32 flags) {
	_flags |= flags;
}

void GfxObj::clearFlags(uint32 flags) {
	_flags &= ~flags;
}

void Gfx::addObjectToScene(GfxObj *obj) {
	if (!obj) {
		return;
	}

	if (!obj->isVisible()) {
		return;
	}

	if (SCENE_DRAWLIST_SIZE == _sceneObjects.size()) {
		warning("number of objects in the current scene is larger than the fixed drawlist size");
	}

	_sceneObjects.push_back(obj);
}

void Gfx::resetSceneDrawList() {
	_sceneObjects.clear();
	_sceneObjects.reserve(SCENE_DRAWLIST_SIZE);
}

GfxObj* Gfx::loadAnim(const char *name) {
	debugC(1, kDebugGraphics, "Gfx::loadAnim(\"%s\")", name);
	Frames* frames = _disk->loadFrames(name);
	assert(frames);

	GfxObj *obj = new GfxObj(kGfxObjTypeAnim, frames, name);
	assert(obj);

	// animation Z is not set here, but controlled by game scripts and user interaction.
	// it is always >=0 and <screen height
	obj->transparentKey = 0;
	return obj;
}

GfxObj* Gfx::loadCharacterAnim(const char *name) {
	return loadAnim(name);
}

GfxObj* Gfx::loadGet(const char *name) {
	GfxObj *obj = _disk->loadStatic(name);
	assert(obj);

	obj->z = kGfxObjGetZ;	// this preset Z value ensures that get zones are drawn after doors but before animations
	obj->type = kGfxObjTypeGet;
	obj->transparentKey = 0;
	return obj;
}

GfxObj* Gfx::loadDoor(const char *name) {
	Frames *frames = _disk->loadFrames(name);
	assert(frames);

	GfxObj *obj = new GfxObj(kGfxObjTypeDoor, frames, name);
	assert(obj);

	obj->z = kGfxObjDoorZ;	// this preset Z value ensures that doors are drawn first
	obj->transparentKey = 0;
	return obj;
}

void Gfx::freeLocationObjects() {
	freeDialogueObjects();
	freeLabels();
}

void Gfx::freeCharacterObjects() {
	freeDialogueObjects();
}

void BackgroundInfo::loadGfxObjMask(Parallaction *vm, const char *name, GfxObj *obj) {
	debugC(1, kDebugGraphics, "BackgroundInfo::loadGfxObjMask(\"%s\")", name);
	Common::Rect rect;
	obj->getRect(0, rect);

	MaskBuffer *buf = vm->_disk->loadMask(name, rect.width(), rect.height());

	obj->_maskId = addMaskPatch(buf);
	obj->_hasMask = true;
}

void BackgroundInfo::loadGfxObjPath(Parallaction *vm, const char *name, GfxObj *obj) {
	Common::Rect rect;
	obj->getRect(0, rect);

	PathBuffer *buf = vm->_disk->loadPath(name, rect.width(), rect.height());

	obj->_pathId = addPathPatch(buf);
	obj->_hasPath = true;
}

void Gfx::showGfxObj(GfxObj* obj, bool visible) {
	if (!obj) {
		return;
	}
	debugC(1, kDebugGraphics, "Gfx::showGfxObj(\"%s\", visible:%d)", obj->getName(), visible ? 1 : 0);

	if (visible) {
		obj->setFlags(kGfxObjVisible);
	} else {
		obj->clearFlags(kGfxObjVisible);
	}

	if (obj->_hasMask) {
		debugC(1, kDebugGraphics, "\tHas Mask");
		_backgroundInfo->toggleMaskPatch(obj->_maskId, obj->x, obj->y, visible);
	}
	if (obj->_hasPath) {
		debugC(1, kDebugGraphics, "\tHas Path");
		_backgroundInfo->togglePathPatch(obj->_pathId, obj->x, obj->y, visible);
	}
}

bool compareZ(const GfxObj* a1, const GfxObj* a2) {
	return (a1->z == a2->z) ? (a1->_prog < a2->_prog) : (a1->z < a2->z);
}

void Gfx::sortScene() {
	debugC(3, kDebugGraphics, "Gfx::sortScene()");
	GfxObjArray::iterator first = _sceneObjects.begin();
	GfxObjArray::iterator last = _sceneObjects.end();

	Common::sort(first, last, compareZ);
}

void Gfx::drawGfxObject(GfxObj *obj, Graphics::Surface &surf) {
	if (!obj->isVisible()) {
		return;
	}

	Common::Rect rect;
	byte *data;

	obj->getRect(obj->frame, rect);

	int x = obj->x;
	int y = obj->y;
	if (_overlayMode) {
		x += _scrollPosX;
		y += _scrollPosY;
	}
	rect.translate(x, y);
	data = obj->getData(obj->frame);

	// WORKAROUND: During the end credits, game scripts try to show a
	// non-existing frame. We change it to an existing one here.
	if (obj->frame == 14 && obj->getNum() == 9 && !strcmp(obj->getName(), "Dinor"))
		obj->frame = 8;

	if (obj->getSize(obj->frame) == obj->getRawSize(obj->frame)) {
		blt(rect, data, &surf, obj->layer, obj->scale, obj->transparentKey);
	} else {
		unpackBlt(rect, data, obj->getRawSize(obj->frame), &surf, obj->layer, obj->scale, obj->transparentKey);
	}

}

void Gfx::drawText(Font *font, Graphics::Surface* surf, uint16 x, uint16 y, const char *text, byte color) {
	byte *dst = (byte *)surf->getBasePtr(x, y);
	font->setColor(color);
	font->drawString(dst, surf->w, text);
}

void Gfx::unpackBlt(const Common::Rect& r, byte *data, uint size, Graphics::Surface *surf, uint16 z, uint scale, byte transparentColor) {
	byte *d = _unpackedBitmap;
	uint pixelsLeftInLine = r.width();

	while (size > 0) {
		uint8 p = *data++;
		size--;
		uint8 color = p & 0xF;
		uint8 repeat = (p & 0xF0) >> 4;
		if (repeat == 0) {
			repeat = *data++;
			size--;
		}
		if (repeat == 0) {
			// end of line
			repeat = pixelsLeftInLine;
			pixelsLeftInLine = r.width();
		} else {
			pixelsLeftInLine -= repeat;
		}

		memset(d, color, repeat);
		d += repeat;
	}

	blt(r, _unpackedBitmap, surf, z, scale, transparentColor);
}

void Gfx::bltMaskScale(const Common::Rect& r, byte *data, Graphics::Surface *surf, uint16 z, uint scale, byte transparentColor) {
	if (scale == 100) {
		// use optimized path
		bltMaskNoScale(r, data, surf, z, transparentColor);
		return;
	}

	// unscaled rectangle size
	uint width = r.width();
	uint height = r.height();

	// scaled rectangle size
	uint scaledWidth = r.width() * scale / 100;
	uint scaledHeight = r.height() * scale / 100;

	// scaled rectangle origin
	uint scaledLeft = r.left + (width - scaledWidth) / 2;
	uint scaledTop = r.top + (height - scaledHeight);

	// clipped scaled destination rectangle
	Common::Rect dstRect(scaledWidth, scaledHeight);
	dstRect.moveTo(scaledLeft, scaledTop);

	Common::Rect clipper(surf->w, surf->h);
	dstRect.clip(clipper);
	if (!dstRect.isValidRect()) return;

	// clipped source rectangle
	Common::Rect srcRect;
	srcRect.left = (dstRect.left - scaledLeft)  * 100 / scale;
	srcRect.top = (dstRect.top - scaledTop) * 100 / scale;
	srcRect.setWidth(dstRect.width() * 100 / scale);
	srcRect.setHeight(dstRect.height() * 100 / scale);
	if (!srcRect.isValidRect()) return;

	Common::Point dp;
	dp.x = dstRect.left;
	dp.y = dstRect.top;

	byte *s = data + srcRect.left + srcRect.top * width;
	byte *d = (byte *)surf->getBasePtr(dp.x, dp.y);

	uint line = 0, col = 0;

	uint xAccum = 0, yAccum = 0;
	uint inc = width * (100 - scale);
	uint thr = width * 100;

	for (uint16 i = 0; i < srcRect.height(); i++) {
		yAccum += inc;

		if (yAccum >= thr) {
			yAccum -= thr;
			s += width;
			continue;
		}

		xAccum = 0;
		byte *d2 = d;
		col = 0;

		for (uint16 j = 0; j < srcRect.width(); j++) {
			xAccum += inc;

			if (xAccum >= thr) {
				xAccum -= thr;
				s++;
				continue;
			}

			if (*s != transparentColor) {
				if (_backgroundInfo->hasMask()) {
					byte v = _backgroundInfo->_mask->getValue(dp.x + col, dp.y + line);
					if (z >= v) *d2 = *s;
				} else {
					*d2 = *s;
				}
			}

			s++;
			d2++;
			col++;
		}

		s += width - srcRect.width();
		d += surf->w;
		line++;
	}

}

void Gfx::bltMaskNoScale(const Common::Rect& r, byte *data, Graphics::Surface *surf, uint16 z, byte transparentColor) {
	if (!_backgroundInfo->hasMask() || (z == LAYER_FOREGROUND)) {
		// use optimized path
		bltNoMaskNoScale(r, data, surf, transparentColor);
		return;
	}

	Common::Point dp;
	Common::Rect q(r);

	Common::Rect clipper(surf->w, surf->h);

	q.clip(clipper);
	if (!q.isValidRect()) return;

	dp.x = q.left;
	dp.y = q.top;

	q.translate(-r.left, -r.top);

	byte *s = data + q.left + q.top * r.width();
	byte *d = (byte *)surf->getBasePtr(dp.x, dp.y);

	uint sPitch = r.width() - q.width();
	uint dPitch = surf->w - q.width();

	for (uint16 i = 0; i < q.height(); i++) {

		for (uint16 j = 0; j < q.width(); j++) {
			if (*s != transparentColor) {
				if (_backgroundInfo->hasMask()) {
					byte v = _backgroundInfo->_mask->getValue(dp.x + j, dp.y + i);
					if (z >= v) *d = *s;
				} else {
					*d = *s;
				}
			}

			s++;
			d++;
		}

		s += sPitch;
		d += dPitch;
	}

}

void Gfx::bltNoMaskNoScale(const Common::Rect& r, byte *data, Graphics::Surface *surf, byte transparentColor) {
	Common::Point dp;
	Common::Rect q(r);

	Common::Rect clipper(surf->w, surf->h);

	q.clip(clipper);
	if (!q.isValidRect()) return;

	dp.x = q.left;
	dp.y = q.top;

	q.translate(-r.left, -r.top);

	byte *s = data + q.left + q.top * r.width();
	byte *d = (byte *)surf->getBasePtr(dp.x, dp.y);

	uint sPitch = r.width() - q.width();
	uint dPitch = surf->w - q.width();

	for (uint16 i = q.top; i < q.bottom; i++) {
		for (uint16 j = q.left; j < q.right; j++) {
			if (*s != transparentColor)
				*d = *s;

			s++;
			d++;
		}

		s += sPitch;
		d += dPitch;
	}
}

void Gfx::blt(const Common::Rect& r, byte *data, Graphics::Surface *surf, uint16 z, uint scale, byte transparentColor) {
	bltMaskScale(r, data, surf, z, scale, transparentColor);
}

} // namespace Parallaction