/**
 * RdTk: Remote Desktop Toolkit
 *
 * Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <rdtk/config.h>

#include <errno.h>

#include <winpr/config.h>
#include <winpr/wtypes.h>
#include <winpr/crt.h>
#include <winpr/assert.h>
#include <winpr/path.h>
#include <winpr/file.h>
#include <winpr/print.h>

#include "rdtk_engine.h"
#include "rdtk_resources.h"
#include "rdtk_surface.h"

#include "rdtk_font.h"

#if defined(WINPR_WITH_PNG)
#define FILE_EXT "png"
#else
#define FILE_EXT "bmp"
#endif

static int rdtk_font_draw_glyph(rdtkSurface* surface, int nXDst, int nYDst, rdtkFont* font,
                                rdtkGlyph* glyph)
{
	WINPR_ASSERT(surface);
	WINPR_ASSERT(font);
	WINPR_ASSERT(glyph);

	nXDst += glyph->offsetX;
	nYDst += glyph->offsetY;
	const int nXSrc = glyph->rectX;
	const int nYSrc = glyph->rectY;
	const int nWidth = glyph->rectWidth;
	const int nHeight = glyph->rectHeight;
	const uint32_t nSrcStep = font->image->scanline;
	const uint8_t* pSrcData = font->image->data;
	uint8_t* pDstData = surface->data;
	const uint32_t nDstStep = surface->scanline;

	for (int y = 0; y < nHeight; y++)
	{
		const uint8_t* pSrcPixel = &pSrcData[((nYSrc + y) * nSrcStep) + (nXSrc * 4)];
		uint8_t* pDstPixel = &pDstData[((nYDst + y) * nDstStep) + (nXDst * 4)];

		for (int x = 0; x < nWidth; x++)
		{
			uint8_t B = pSrcPixel[0];
			uint8_t G = pSrcPixel[1];
			uint8_t R = pSrcPixel[2];
			uint8_t A = pSrcPixel[3];
			pSrcPixel += 4;

			if (1)
			{
				/* tint black */
				R = 255 - R;
				G = 255 - G;
				B = 255 - B;
			}

			if (A == 255)
			{
				pDstPixel[0] = B;
				pDstPixel[1] = G;
				pDstPixel[2] = R;
			}
			else
			{
				R = (R * A) / 255;
				G = (G * A) / 255;
				B = (B * A) / 255;
				pDstPixel[0] = B + (pDstPixel[0] * (255 - A) + (255 / 2)) / 255;
				pDstPixel[1] = G + (pDstPixel[1] * (255 - A) + (255 / 2)) / 255;
				pDstPixel[2] = R + (pDstPixel[2] * (255 - A) + (255 / 2)) / 255;
			}

			pDstPixel[3] = 0xFF;
			pDstPixel += 4;
		}
	}

	return 1;
}

int rdtk_font_draw_text(rdtkSurface* surface, uint16_t nXDst, uint16_t nYDst, rdtkFont* font,
                        const char* text)
{
	WINPR_ASSERT(surface);
	WINPR_ASSERT(font);
	WINPR_ASSERT(text);

	const size_t length = strlen(text);
	for (size_t index = 0; index < length; index++)
	{
		rdtkGlyph* glyph = &font->glyphs[text[index] - 32];
		rdtk_font_draw_glyph(surface, nXDst, nYDst, font, glyph);
		nXDst += (glyph->width + 1);
	}

	return 1;
}

int rdtk_font_text_draw_size(rdtkFont* font, uint16_t* width, uint16_t* height, const char* text)
{
	WINPR_ASSERT(font);
	WINPR_ASSERT(width);
	WINPR_ASSERT(height);
	WINPR_ASSERT(text);

	*width = 0;
	*height = 0;
	const size_t length = strlen(text);
	for (size_t index = 0; index < length; index++)
	{
		const size_t glyphIndex = text[index] - 32;

		if (glyphIndex < font->glyphCount)
		{
			rdtkGlyph* glyph = &font->glyphs[glyphIndex];
			*width += (glyph->width + 1);
		}
	}

	*height = font->height + 2;
	return 1;
}

static char* rdtk_font_load_descriptor_file(const char* filename, size_t* pSize)
{
	WINPR_ASSERT(filename);
	WINPR_ASSERT(pSize);

	union
	{
		size_t s;
		INT64 i64;
	} fileSize;
	FILE* fp = winpr_fopen(filename, "r");

	if (!fp)
		return NULL;

	_fseeki64(fp, 0, SEEK_END);
	fileSize.i64 = _ftelli64(fp);
	_fseeki64(fp, 0, SEEK_SET);

	if (fileSize.i64 < 1)
	{
		fclose(fp);
		return NULL;
	}

	uint8_t* buffer = (uint8_t*)malloc(fileSize.s + 2);

	if (!buffer)
	{
		fclose(fp);
		return NULL;
	}

	size_t readSize = fread(buffer, fileSize.s, 1, fp);
	if (readSize == 0)
	{
		if (!ferror(fp))
			readSize = fileSize.s;
	}

	fclose(fp);

	if (readSize < 1)
	{
		free(buffer);
		return NULL;
	}

	buffer[fileSize.s] = '\0';
	buffer[fileSize.s + 1] = '\0';
	*pSize = fileSize.s;
	return (char*)buffer;
}

static int rdtk_font_convert_descriptor_code_to_utf8(const char* str, uint8_t* utf8)
{
	WINPR_ASSERT(str);
	WINPR_ASSERT(utf8);

	const size_t len = strlen(str);
	*((uint32_t*)utf8) = 0;

	if (len < 1)
		return 1;

	if (len == 1)
	{
		if ((str[0] > 31) && (str[0] < 127))
		{
			utf8[0] = str[0];
		}
	}
	else
	{
		if (str[0] == '&')
		{
			const char* acc = &str[1];

			if (strcmp(acc, "quot;") == 0)
				utf8[0] = '"';
			else if (strcmp(acc, "amp;") == 0)
				utf8[0] = '&';
			else if (strcmp(acc, "lt;") == 0)
				utf8[0] = '<';
			else if (strcmp(acc, "gt;") == 0)
				utf8[0] = '>';
		}
	}

	return 1;
}

static int rdtk_font_parse_descriptor_buffer(rdtkFont* font, uint8_t* buffer, size_t size)
{
	WINPR_ASSERT(font);

	char* p = strstr((char*)buffer, "<?xml version=\"1.0\" encoding=\"utf-8\"?>");

	if (!p)
		return -1;

	p += sizeof("<?xml version=\"1.0\" encoding=\"utf-8\"?>") - 1;
	p = strstr(p, "<Font ");

	if (!p)
		return -1;

	p += sizeof("<Font ") - 1;
	/* find closing font tag */
	char* end = strstr(p, "</Font>");

	if (!end)
		return -1;

	/* parse font size */
	p = strstr(p, "size=\"");

	if (!p)
		return -1;

	p += sizeof("size=\"") - 1;
	char* q = strchr(p, '"');

	if (!q)
		return -1;

	*q = '\0';
	errno = 0;
	{
		long val = strtol(p, NULL, 0);

		if ((errno != 0) || (val < INT32_MIN) || (val > INT32_MAX))
			return -1;

		font->size = val;
	}
	*q = '"';

	if (font->size <= 0)
		return -1;

	p = q + 1;
	/* parse font family */
	p = strstr(p, "family=\"");

	if (!p)
		return -1;

	p += sizeof("family=\"") - 1;
	q = strchr(p, '"');

	if (!q)
		return -1;

	*q = '\0';
	font->family = _strdup(p);
	*q = '"';

	if (!font->family)
		return -1;

	p = q + 1;
	/* parse font height */
	p = strstr(p, "height=\"");

	if (!p)
		return -1;

	p += sizeof("height=\"") - 1;
	q = strchr(p, '"');

	if (!q)
		return -1;

	*q = '\0';
	errno = 0;
	{
		long val = strtol(p, NULL, 0);

		if ((errno != 0) || (val < INT32_MIN) || (val > INT32_MAX))
			return -1;

		font->height = val;
	}
	*q = '"';

	if (font->height <= 0)
		return -1;

	p = q + 1;
	/* parse font style */
	p = strstr(p, "style=\"");

	if (!p)
		return -1;

	p += sizeof("style=\"") - 1;
	q = strchr(p, '"');

	if (!q)
		return -1;

	*q = '\0';
	font->style = _strdup(p);
	*q = '"';

	if (!font->style)
		return -1;

	p = q + 1;
	// printf("size: %d family: %s height: %d style: %s\n",
	//		font->size, font->family, font->height, font->style);
	char* beg = p;
	size_t count = 0;

	while (p < end)
	{
		p = strstr(p, "<Char ");

		if (!p)
			return -1;

		p += sizeof("<Char ") - 1;
		char* r = strstr(p, "/>");

		if (!r)
			return -1;

		*r = '\0';
		p = r + sizeof("/>");
		*r = '/';
		count++;
	}

	if (count > UINT16_MAX)
		return -1;

	font->glyphCount = (uint16_t)count;
	font->glyphs = NULL;

	if (count > 0)
		font->glyphs = (rdtkGlyph*)calloc(font->glyphCount, sizeof(rdtkGlyph));

	if (!font->glyphs)
		return -1;

	p = beg;
	size_t index = 0;

	while (p < end)
	{
		p = strstr(p, "<Char ");

		if (!p)
			return -1;

		p += sizeof("<Char ") - 1;
		char* r = strstr(p, "/>");

		if (!r)
			return -1;

		*r = '\0';
		/* start parsing glyph */
		if (index >= font->glyphCount)
			return -1;

		rdtkGlyph* glyph = &font->glyphs[index];
		/* parse glyph width */
		p = strstr(p, "width=\"");

		if (!p)
			return -1;

		p += sizeof("width=\"") - 1;
		q = strchr(p, '"');

		if (!q)
			return -1;

		*q = '\0';
		errno = 0;
		{
			long val = strtoul(p, NULL, 0);

			if ((errno != 0) || (val < INT32_MIN) || (val > INT32_MAX))
				return -1;

			glyph->width = val;
		}
		*q = '"';

		if (glyph->width < 0)
			return -1;

		p = q + 1;
		/* parse glyph offset x,y */
		p = strstr(p, "offset=\"");

		if (!p)
			return -1;

		p += sizeof("offset=\"") - 1;
		q = strchr(p, '"');

		if (!q)
			return -1;

		char* tok[4] = { 0 };
		*q = '\0';
		tok[0] = p;
		p = strchr(tok[0] + 1, ' ');

		if (!p)
			return -1;

		*p = 0;
		tok[1] = p + 1;
		errno = 0;
		{
			long val = strtol(tok[0], NULL, 0);

			if ((errno != 0) || (val < INT32_MIN) || (val > INT32_MAX))
				return -1;

			glyph->offsetX = val;
		}
		{
			long val = strtol(tok[1], NULL, 0);

			if ((errno != 0) || (val < INT32_MIN) || (val > INT32_MAX))
				return -1;

			glyph->offsetY = val;
		}
		*q = '"';
		p = q + 1;
		/* parse glyph rect x,y,w,h */
		p = strstr(p, "rect=\"");

		if (!p)
			return -1;

		p += sizeof("rect=\"") - 1;
		q = strchr(p, '"');

		if (!q)
			return -1;

		*q = '\0';
		tok[0] = p;
		p = strchr(tok[0] + 1, ' ');

		if (!p)
			return -1;

		*p = 0;
		tok[1] = p + 1;
		p = strchr(tok[1] + 1, ' ');

		if (!p)
			return -1;

		*p = 0;
		tok[2] = p + 1;
		p = strchr(tok[2] + 1, ' ');

		if (!p)
			return -1;

		*p = 0;
		tok[3] = p + 1;
		errno = 0;
		{
			long val = strtol(tok[0], NULL, 0);

			if ((errno != 0) || (val < INT32_MIN) || (val > INT32_MAX))
				return -1;

			glyph->rectX = val;
		}
		{
			long val = strtol(tok[1], NULL, 0);

			if ((errno != 0) || (val < INT32_MIN) || (val > INT32_MAX))
				return -1;

			glyph->rectY = val;
		}
		{
			long val = strtol(tok[2], NULL, 0);

			if ((errno != 0) || (val < INT32_MIN) || (val > INT32_MAX))
				return -1;

			glyph->rectWidth = val;
		}
		{
			long val = strtol(tok[3], NULL, 0);

			if ((errno != 0) || (val < INT32_MIN) || (val > INT32_MAX))
				return -1;

			glyph->rectHeight = val;
		}
		*q = '"';
		p = q + 1;
		/* parse code */
		p = strstr(p, "code=\"");

		if (!p)
			return -1;

		p += sizeof("code=\"") - 1;
		q = strchr(p, '"');

		if (!q)
			return -1;

		*q = '\0';
		rdtk_font_convert_descriptor_code_to_utf8(p, glyph->code);
		*q = '"';
		/* finish parsing glyph */
		p = r + sizeof("/>");
		*r = '/';
		index++;
	}

	return 1;
}

static int rdtk_font_load_descriptor(rdtkFont* font, const char* filename)
{
	size_t size = 0;

	WINPR_ASSERT(font);
	char* buffer = rdtk_font_load_descriptor_file(filename, &size);

	if (!buffer)
		return -1;

	return rdtk_font_parse_descriptor_buffer(font, (uint8_t*)buffer, size);
}

rdtkFont* rdtk_font_new(rdtkEngine* engine, const char* path, const char* file)
{
	size_t length = 0;
	rdtkFont* font = NULL;
	char* fontImageFile = NULL;
	char* fontDescriptorFile = NULL;

	WINPR_ASSERT(engine);
	WINPR_ASSERT(path);
	WINPR_ASSERT(file);

	char* fontBaseFile = GetCombinedPath(path, file);
	if (!fontBaseFile)
		goto cleanup;

	winpr_asprintf(&fontImageFile, &length, "%s." FILE_EXT, fontBaseFile);
	if (!fontImageFile)
		goto cleanup;

	winpr_asprintf(&fontDescriptorFile, &length, "%s.xml", fontBaseFile);
	if (!fontDescriptorFile)
		goto cleanup;

	if (!winpr_PathFileExists(fontImageFile))
		goto cleanup;

	if (!winpr_PathFileExists(fontDescriptorFile))
		goto cleanup;

	font = (rdtkFont*)calloc(1, sizeof(rdtkFont));

	if (!font)
		goto cleanup;

	font->engine = engine;
	font->image = winpr_image_new();

	if (!font->image)
		goto cleanup;

	const int status = winpr_image_read(font->image, fontImageFile);
	if (status < 0)
		goto cleanup;

	const int status2 = rdtk_font_load_descriptor(font, fontDescriptorFile);
	if (status2 < 0)
		goto cleanup;

	free(fontBaseFile);
	free(fontImageFile);
	free(fontDescriptorFile);
	return font;
cleanup:
	free(fontBaseFile);
	free(fontImageFile);
	free(fontDescriptorFile);

	rdtk_font_free(font);
	return NULL;
}

static rdtkFont* rdtk_embedded_font_new(rdtkEngine* engine, const uint8_t* imageData,
                                        size_t imageSize, const uint8_t* descriptorData,
                                        size_t descriptorSize)
{
	size_t size = 0;
	uint8_t* buffer = NULL;

	WINPR_ASSERT(engine);

	rdtkFont* font = (rdtkFont*)calloc(1, sizeof(rdtkFont));

	if (!font)
		return NULL;

	font->engine = engine;
	font->image = winpr_image_new();

	if (!font->image)
	{
		free(font);
		return NULL;
	}

	const int status = winpr_image_read_buffer(font->image, imageData, imageSize);
	if (status < 0)
	{
		winpr_image_free(font->image, TRUE);
		free(font);
		return NULL;
	}

	size = descriptorSize;
	buffer = (uint8_t*)malloc(size);

	if (!buffer)
		goto fail;

	CopyMemory(buffer, descriptorData, size);
	const int status2 = rdtk_font_parse_descriptor_buffer(font, buffer, size);
	free(buffer);

	if (status2 < 0)
		goto fail;

	return font;

fail:
	rdtk_font_free(font);
	return NULL;
}

void rdtk_font_free(rdtkFont* font)
{
	if (font)
	{
		free(font->family);
		free(font->style);
		winpr_image_free(font->image, TRUE);
		free(font->glyphs);
		free(font);
	}
}
int rdtk_font_engine_init(rdtkEngine* engine)
{
	WINPR_ASSERT(engine);
	if (!engine->font)
	{
		const uint8_t* imageData = NULL;
		const uint8_t* descriptorData = NULL;
		const SSIZE_T imageSize =
		    rdtk_get_embedded_resource_file("source_serif_pro_regular_12." FILE_EXT, &imageData);
		const SSIZE_T descriptorSize =
		    rdtk_get_embedded_resource_file("source_serif_pro_regular_12.xml", &descriptorData);

		if ((imageSize < 0) || (descriptorSize < 0))
			return -1;

		engine->font = rdtk_embedded_font_new(engine, imageData, (size_t)imageSize, descriptorData,
		                                      (size_t)descriptorSize);
		if (!engine->font)
			return -1;
	}

	return 1;
}

int rdtk_font_engine_uninit(rdtkEngine* engine)
{
	WINPR_ASSERT(engine);
	if (engine->font)
	{
		rdtk_font_free(engine->font);
		engine->font = NULL;
	}

	return 1;
}