/* 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.
 *
 * $URL$
 * $Id$
 *
 */

#include "common/file.h"
#include "common/util.h"

#include "cruise/cruise_main.h"

namespace Cruise {

// (old: fontProc1(int16 param, uint8* ptr1, uint8* ptr2))
int32 getLineHeight(int16 charCount, uint8 * fontPtr, uint8 * fontPrt_Desc) {
	uint8 *dest;
	int32 highestChar = 0;
	int32 i;

	if (!charCount) {
		return (0);
	}
	dest = fontPrt_Desc + 6;	// fontPtr + 20         // char height

	for (i = 0; i < charCount; i++) {
		if ((*(int16 *) dest) > highestChar) {
			highestChar = *(int16 *) dest;
		}
		dest += 12;
	}
	return highestChar;
}

// this function determins how many lines the text will have (old: fontProc2(int32 param1, int32 param2, uint8* ptr, uint8* string))
int32 getTextLineCount(int32 rightBorder_X, int32 wordSpacingWidth,
	    uint8 *ptr, const uint8 *textString) {
	const uint8 *localString = textString;
	const uint8 *currentStringPtr;
	uint8 character;

	int32 var_6 = 0;
	int32 lineLength = 0;

	const uint8 *tempPtr = 0;

	if (!*localString) {
		return (0);
	}
	currentStringPtr = localString;
	character = *localString;

	do {
		int32 charData = fontCharacterTable[character];

		if (character == '|') {
			lineLength = rightBorder_X;
			localString = tempPtr;
		} else {
			if (charData >= 0) {	// + 0xA jump to last 2 bytes of the 12 bytes slice = letter width
				lineLength +=
				    wordSpacingWidth + *(int16 *) (ptr + 0xA +
				    charData * 12);
			} else {
				if (character == ' ') {
					lineLength += wordSpacingWidth + 5;
					localString = currentStringPtr;
				}
			}
		}

		tempPtr = currentStringPtr;

		if (rightBorder_X <= lineLength) {
			var_6 += rightBorder_X;
			currentStringPtr = localString;
			tempPtr = localString;
			lineLength = 0;
		}

		character = *(tempPtr++);
		currentStringPtr = tempPtr;

	} while (character);

	if (lineLength == 0) {
		return (var_6 / rightBorder_X);
	} else {
		return ((var_6 + rightBorder_X) / rightBorder_X);
	}
}

void loadFNT(const char *fileName) {
	uint8 header[6];
	int32 fontSize;
	int32 data2;
	uint8 data3[6];

	_systemFNT = NULL;

	Common::File fontFileHandle;

	if (!fontFileHandle.exists(fileName)) {
		return;
	}

	fontFileHandle.open((const char *)fileName);

	fontFileHandle.read(header, 4);

	if (strcmp((char*)header, "FNT") == 0) {
		fontFileHandle.read(&fontSize, 4);
		flipLong(&fontSize);

		fontFileHandle.read(&data2, 4);
		flipLong(&data2);

		fontFileHandle.read(data3, 6);	// may need an endian flip ?
		flipGen(&data3, 6);

		_systemFNT = (uint8 *)mallocAndZero(fontSize);

		if (_systemFNT != NULL) {
			int32 i;
			uint8 *currentPtr;

			fontFileHandle.seek(0);
			fontFileHandle.read(header, 4);	// not really require, we could fseek to 4

			fontFileHandle.read(_systemFNT, fontSize);

			flipLong((int32 *) _systemFNT);
			flipLong((int32 *) (_systemFNT + 4));
			flipGen(_systemFNT + 8, 6);

			currentPtr = _systemFNT + 14;

			for (i = 0; i < *(int16 *)(_systemFNT + 8); i++) {
				flipLong((int32 *)currentPtr);
				currentPtr += 4;

				flipGen(currentPtr, 8);
				currentPtr += 8;
			}
		}
	}

	fontFileHandle.close();
}

void initSystem(void) {
	int32 i;

	itemColor = 15;
	titleColor = 9;
	selectColor = 13;
	subColor = 10;

	for (i = 0; i < 64; i++) {
		strcpy(preloadData[i].name, "");
		preloadData[i].ptr = NULL;
		preloadData[i].nofree = 0;
	}

	lowMemory = 0;

	doFade = 0;
	fadeFlag = 0;
	scroll = 0;
	switchPal = 0;
	masterScreen = 0;

	changeCursor(CURSOR_NORMAL);

	strcpy(cmdLine, "");

	loadFNT("system.fnt");
}

void flipShort(int16 *var) {
	uint8 *varPtr = (uint8 *) var;
	SWAP(varPtr[0], varPtr[1]);
}

void flipShort(uint16 *var) {
	uint8 *varPtr = (uint8 *) var;
	SWAP(varPtr[0], varPtr[1]);
}

void flipLong(int32 *var) {
	char *varPtr = (char *)var;

	SWAP(varPtr[0], varPtr[3]);
	SWAP(varPtr[1], varPtr[2]);
}

void flipLong(uint32 *var) {
	char *varPtr = (char *)var;

	SWAP(varPtr[0], varPtr[3]);
	SWAP(varPtr[1], varPtr[2]);
}

void flipGen(void *var, int32 length) {
	int i;
	short int *varPtr = (int16 *) var;

	for (i = 0; i < (length / 2); i++) {
		flipShort(&varPtr[i]);
	}
}

void renderWord(uint8 * fontPtr_Data, uint8 * outBufferPtr,
	    int32 drawPosPixel_X, int32 heightOff, int32 height, int32 param4,
    	int32 stringRenderBufferSize, int32 width, int32 charWidth) {
	int i;
	int j;
	uint8 *fontPtr_Data2 = fontPtr_Data + height * 2;

	outBufferPtr += heightOff * width * 2;	// param2 = height , param6 = width
	outBufferPtr += drawPosPixel_X;	// param1 = drawPosPixel_X

	for (i = 0; i < height; i++) {	// y++
		uint16 currentColor1 =
		    (*(fontPtr_Data) << 8) | *(fontPtr_Data + 1);
		uint16 currentColor2 =
		    (*(fontPtr_Data2) << 8) | *(fontPtr_Data2 + 1);

		fontPtr_Data += 2;
		fontPtr_Data2 += 2;

		for (j = 0; j < charWidth; j++) {
			*outBufferPtr =
			    ((currentColor1 >> 15) & 1) | ((currentColor2 >>
				14) & 2);
			outBufferPtr++;

			currentColor1 <<= 1;
			currentColor2 <<= 1;
		}
		outBufferPtr += (width * 2) - charWidth;
	}
}

// returns character count and pixel size (via pointer) per line of the string (old: prepareWordRender(int32 param, int32 var1, int16* out2, uint8* ptr3, uint8* string))
int32 prepareWordRender(int32 inRightBorder_X, int32 wordSpacingWidth,
	    int16 * strPixelLength, uint8 * ptr3, const uint8 * textString) {
	const uint8 *localString = textString;

	int32 counter = 0;
	int32 finish = 0;
	int32 temp_pc = 0;	// var_A                // temporary pixel count save
	int32 temp_cc = 0;	// var_C                // temporary char  count save
	int32 pixelCount = 0;	// si

	do {
		uint8 character = *(localString++);
		int16 charData = fontCharacterTable[character];

		if (character == ' ') {
			temp_cc = counter;
			temp_pc = pixelCount;

			if (pixelCount + wordSpacingWidth + 5 >=
			    inRightBorder_X) {
				finish = 1;
			} else {
				pixelCount += wordSpacingWidth + 5;
			}
		} else {
			if (character == '|' || !character) {
				finish = 1;
			} else {
				if (charData) {
					if (pixelCount + wordSpacingWidth +
					    *(int16 *) ((ptr3 +
						    charData * 12) + 0xA) >=
					    inRightBorder_X) {
						finish = 1;
						if (temp_pc) {
							pixelCount = temp_pc;
							counter = temp_cc;
						}
					} else {
						pixelCount +=
						    wordSpacingWidth +
						    *(int16 *) ((ptr3 +
							charData * 12) + 0xA);
					}
				}
			}
		}
		counter++;
	} while (!finish);

	*strPixelLength = (int16) pixelCount;
	return counter;
}

void drawString(int32 x, int32 y, uint8 *string, uint8 *buffer, uint8 color,
	    int32 inRightBorder_X) {
	uint8 *fontPtr;
	uint8 *fontPtr_Data;	// ptr2
	uint8 *fontPtr_Desc;	// ptr3
	int32 wordSpacingWidth;	// var1
	int32 wordSpacingHeight;	// var2
	int32 rightBorder_X;	// param2
	int32 lineHeight;	// fontProc1result
	int32 numLines;
	int32 stringHeight;
	int32 stringFinished;
	int32 stringWidth;	// var_1C
	int32 stringRenderBufferSize;
	int32 useDynamicBuffer;
	uint8 *currentStrRenderBuffer;
	// int32 var_8;                                                         // don't need that on
	int32 heightOffset;	// var_12
	int32 renderBufferSize;	// var_1E
	int needFlip;

	if (!buffer || !string) {
		return;
	}

	if (fontFileIndex != -1) {
		fontPtr = filesDatabase[fontFileIndex].subData.ptr;

		if (!fontPtr) {
			fontPtr = _systemFNT;
		}
	} else {
		fontPtr = _systemFNT;
	}

	if (!fontPtr) {
		return;
	}

	fontPtr_Data = fontPtr + *(int16 *) (fontPtr + 4);
	fontPtr_Desc = fontPtr + 14;

	lineHeight = getLineHeight(*(int16 *) (fontPtr + 8), fontPtr, fontPtr_Desc);	// ok

	wordSpacingWidth = *(int16 *) (fontPtr + 10);
	wordSpacingHeight = *(int16 *) (fontPtr + 12);

	if (inRightBorder_X > 310) {
		rightBorder_X = 310;
	} else {
		rightBorder_X = inRightBorder_X;
	}
	if (x + rightBorder_X > 319) {
		x = 319 - rightBorder_X;
	}
	if (y < 0) {
		y = 0;
	}
	if (x < 0) {
		x = 0;
	}
	numLines = getTextLineCount(rightBorder_X, wordSpacingWidth, fontPtr_Desc, string);	// ok

	if (!numLines) {
		return;
	}
	stringHeight = ((wordSpacingHeight + lineHeight + 2) * numLines) + 1;

	if (y + stringHeight > 199) {
		y = 200 - stringHeight;
	}
	stringFinished = 0;
	stringWidth = (rightBorder_X / 16) + 2;
	stringRenderBufferSize = stringWidth * stringHeight * 4;
	inRightBorder_X = rightBorder_X;

	if (stringRenderBufferSize > 0x2000) {
		currentStrRenderBuffer =
		    (uint8 *) mallocAndZero(stringRenderBufferSize);

		if (!currentStrRenderBuffer) {
			return;
		}
		useDynamicBuffer = 1;
	} else {
		currentStrRenderBuffer = (uint8 *) workBuffer;
		useDynamicBuffer = 0;
	}

	resetRaster(currentStrRenderBuffer, stringRenderBufferSize);

	// var_8        = 0;
	heightOffset = 0;
	renderBufferSize = stringRenderBufferSize;

	do {
		int spacesCount = 0;	// si
		char character = *(string);
		short int strPixelLength;	// var_16;
		uint8 *ptrStringEnd;	// var_4        //ok
		int drawPosPixel_X;	// di

		while (character == ' ') {
			spacesCount++;
			character = *(string + spacesCount);
		}

		string += spacesCount;
		ptrStringEnd = string + prepareWordRender(inRightBorder_X, wordSpacingWidth, &strPixelLength, fontPtr_Desc, string);	//ok

		if (inRightBorder_X > strPixelLength) {
			drawPosPixel_X =
			    (inRightBorder_X - strPixelLength) / 2;
		} else {
			drawPosPixel_X = 0;
		}
		// drawPosPixel_X = var_8;

		do {
			character = *(string++);

			short int data = fontCharacterTable[(int)character];

			if (character) {
				if (character == ' ' || character == 0x7D) {
					drawPosPixel_X += wordSpacingWidth + 5;
				} else {
					if (data) {
						short int *si =
						    (int16 *) (fontPtr_Desc +
						    data * 12);
						//int var_2     = si[5];

						renderWord(fontPtr_Data +
						    si[0],
						    currentStrRenderBuffer,
						    drawPosPixel_X,
						    si[4] - si[3] +
						    lineHeight + heightOffset,
						    si[3], si[2],
						    renderBufferSize / 2,
						    stringWidth * 2, si[5]);

						drawPosPixel_X +=
						    wordSpacingWidth + si[5];
					}
				}
			} else {
				stringFinished = 1;
			}

			if (ptrStringEnd <= string) {
				break;
			}

		} while (!stringFinished);

		// var_8  = 0;
		heightOffset = wordSpacingHeight + lineHeight;

	} while (!stringFinished);

	needFlip = 0;

	if (buffer == gfxModuleData.pPage00) {
		if (gfxModuleData.field_1 != 0) {
			needFlip = 1;
			gfxModuleData_field_90();
		}

		gfxModuleData_gfxWaitVSync();
	}

	gfxModuleData_field_64((char *)currentStrRenderBuffer, stringWidth,
	    stringHeight, (char *)buffer, x, y, 0);
	gfxModuleData_field_64((char *)currentStrRenderBuffer, stringWidth,
	    stringHeight, (char *)buffer, x, y, color);

	if (needFlip) {
		gfxModuleData_flip();
	}

	if (useDynamicBuffer) {
		free(currentStrRenderBuffer);
	}
}

// calculates all necessary datas and renders text
gfxEntryStruct *renderText(int inRightBorder_X, const uint8 *string) {
	uint8 *fontPtr;
	uint8 *fontPtr_Data;	// pt2
	uint8 *fontPtr_Desc;	// ptr3
	int32 wordSpacingWidth;	// var1               //0 or -1
	int32 wordSpacingHeight;	// var2               //0 or -1
	int32 rightBorder_X;
	int32 lineHeight;	// fontProc1result
	int32 numLines;
	int32 stringHeight;
	int32 stringFinished;
	int32 stringWidth;	// var_1C
	int32 stringRenderBufferSize;
	//  int32 useDynamicBuffer;
	uint8 *currentStrRenderBuffer;
	//  int32 var_8;                          // don't need that one
	int32 heightOffset;	// var_12     // how much pixel-lines have already been drawn
	//  int32 var_1E;
	gfxEntryStruct *generatedGfxEntry;

	// check if string is empty
	if (!string) {
		return NULL;
	}
	// check if font has been loaded, else get system font
	if (fontFileIndex != -1) {
		fontPtr = filesDatabase[fontFileIndex].subData.ptr;

		if (!fontPtr) {
			fontPtr = _systemFNT;
		}
	} else {
		fontPtr = _systemFNT;
	}

	if (!fontPtr) {
		return NULL;
	}
	fontPtr_Data = fontPtr + *(int16 *) (fontPtr + 4);	// offset to char data
	fontPtr_Desc = fontPtr + 14;	// offset to char description

	lineHeight = getLineHeight(*(int16 *) (fontPtr + 8), fontPtr, fontPtr_Desc);	// ok

	wordSpacingWidth = *(int16 *) (fontPtr + 10);
	wordSpacingHeight = *(int16 *) (fontPtr + 12);

	// if right border is higher then screenwidth (+ spacing), adjust border
	if (inRightBorder_X > 310) {
		rightBorder_X = 310;
	} else {
		rightBorder_X = inRightBorder_X;
	}
	numLines = getTextLineCount(rightBorder_X, wordSpacingWidth, fontPtr_Desc, string);	// ok

	if (!numLines) {
		return NULL;
	}

	stringHeight = ((wordSpacingHeight + lineHeight + 2) * numLines) + 1;
	stringFinished = 0;
	stringWidth = rightBorder_X + 2;	// max render width to the right
	stringRenderBufferSize = stringWidth * stringHeight * 4;
	inRightBorder_X = rightBorder_X;

	currentStrRenderBuffer =
	    (uint8 *) mallocAndZero(stringRenderBufferSize);
	resetRaster(currentStrRenderBuffer, stringRenderBufferSize);

	generatedGfxEntry = (gfxEntryStruct *) malloc(sizeof(gfxEntryStruct));
	generatedGfxEntry->imagePtr = currentStrRenderBuffer;
	generatedGfxEntry->imageSize = stringRenderBufferSize / 2;
	generatedGfxEntry->fontIndex = fontFileIndex;
	generatedGfxEntry->height = stringHeight;
	generatedGfxEntry->width = stringWidth;	// maximum render width to the right

	// var_8 = 0;
	heightOffset = 0;

	do {
		int spacesCount = 0;	// si
		unsigned char character = *string;
		short int strPixelLength;	// var_16
		const uint8 *ptrStringEnd;	// var_4     //ok
		int drawPosPixel_X;	// di

		// find first letter in string, skip all spaces
		while (character == ' ') {
			spacesCount++;
			character = *(string + spacesCount);
		}

		string += spacesCount;

		// returns character count and pixel length (via pointer) per line of the text string
		ptrStringEnd = string + prepareWordRender(inRightBorder_X, wordSpacingWidth, &strPixelLength, fontPtr_Desc, string);	//ok

		// determine how much space is left to the right and left (center text)
		if (inRightBorder_X > strPixelLength) {
			//var_8 = (inRightBorder_X - strPixelLength) / 2;
			drawPosPixel_X =
			    (inRightBorder_X - strPixelLength) / 2;
		} else {
			drawPosPixel_X = 0;
		}
		//drawPosPixel_X = var_8;

		// draw textline, character wise
		do {
			character = *(string++);

			short int charData = fontCharacterTable[character];	// get character position

			if (character) {
				if (character == ' ' || character == 0x7C) {
					drawPosPixel_X += wordSpacingWidth + 5;	// if char = "space" adjust word starting postion (don't render space though);
				} else {
					if (charData >= 0) {
						short int *si = (int16 *) (fontPtr_Desc + charData * 12);	// offset font data
						// int var_2 = si[5];                                   // don't need this

						// should ist be stringRenderBufferSize/2 for the second last param?
						renderWord(fontPtr_Data +
						    si[0],
						    currentStrRenderBuffer,
						    drawPosPixel_X,
						    si[4] - si[3] +
						    lineHeight + heightOffset,
						    si[3], si[2],
						    stringRenderBufferSize,
						    stringWidth / 2, si[5]);

						drawPosPixel_X +=
						    wordSpacingWidth + si[5];
					}
				}
			} else {
				stringFinished = 1;	// character = 0x00
			}

			// check if string already reached the end
			if (ptrStringEnd <= string) {
				break;
			}
		} while (!stringFinished);

		// var_8 = 0;
		heightOffset += wordSpacingHeight + lineHeight;
	} while (!stringFinished);

	return generatedGfxEntry;
}

} // End of namespace Cruise