/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* libwpd
 * Version: MPL 2.0 / LGPLv2.1+
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Major Contributor(s):
 * Copyright (C) 2003 William Lachance (wrlach@gmail.com)
 * Copyright (C) 2003 Marc Maurer (uwog@uwog.net)
 * Copyright (C) 2006 Fridrich Strba (fridrich.strba@bluewin.ch)
 *
 * For minor contributions see the git repository.
 *
 * Alternatively, the contents of this file may be used under the terms
 * of the GNU Lesser General Public License Version 2.1 or later
 * (LGPLv2.1+), in which case the provisions of the LGPLv2.1+ are
 * applicable instead of those above.
 *
 * For further information visit http://libwpd.sourceforge.net
 */

/* "This product is not manufactured, approved, or supported by
 * Corel Corporation or Corel Corporation Limited."
 */

#include "WP42Parser.h"

#include <memory>

#include "WP42Part.h"
#include "WPXHeader.h"
#include "libwpd_internal.h"
#include "WPXTable.h"
#include "WP42FileStructure.h"
#include "WP42StylesListener.h"
#include "WP42ContentListener.h"

WP42Parser::WP42Parser(librevenge::RVNGInputStream *input, WPXEncryption *encryption) :
	WPXParser(input, nullptr, encryption)
{
}

WP42Parser::~WP42Parser()
{
}

void WP42Parser::parse(librevenge::RVNGInputStream *input, WPXEncryption *encryption, WP42Listener *listener)
{
	listener->startDocument();

	input->seek(0, librevenge::RVNG_SEEK_SET);

	WPD_DEBUG_MSG(("WordPerfect: Starting document body parse (position = %ld)\n",(long)input->tell()));

	parseDocument(input, encryption, listener);

	listener->endDocument();
}

// parseDocument: parses a document body (may call itself recursively, on other streams, or itself)
void WP42Parser::parseDocument(librevenge::RVNGInputStream *input, WPXEncryption *encryption, WP42Listener *listener)
{
	while (!input->isEnd())
	{
		unsigned char readVal;
		readVal = readU8(input, encryption);

		if (readVal < (unsigned char)0x20)
		{
			WPD_DEBUG_MSG(("Offset: %i, Handling Control Character 0x%2x\n", (unsigned int)input->tell(), readVal));

			switch (readVal)
			{
			case 0x09: // tab
				listener->insertTab(0, 0.0);
				break;
			case 0x0A: // hard new line
				listener->insertEOL();
				break;
			case 0x0B: // soft new page
				listener->insertBreak(WPX_SOFT_PAGE_BREAK);
				break;
			case 0x0C: // hard new page
				listener->insertBreak(WPX_PAGE_BREAK);
				break;
			case 0x0D: // soft new line
				listener->insertCharacter(' ');
				break;
			default:
				// unsupported or undocumented token, ignore
				break;
			}
		}
		else if (readVal >= (unsigned char)0x20 && readVal <= (unsigned char)0x7F)
		{
			WPD_DEBUG_MSG(("Offset: %i, Handling Ascii Character 0x%2x\n", (unsigned int)input->tell(), readVal));

			// normal ASCII characters
			listener->insertCharacter(readVal);
		}
		else if (readVal >= (unsigned char)0x80 && readVal <= (unsigned char)0xBF)
		{
			WPD_DEBUG_MSG(("Offset: %i, Handling Single Character Function 0x%2x\n", (unsigned int)input->tell(), readVal));

			// single character function codes
			switch (readVal)
			{
			case 0x92:
				listener->attributeChange(true, WP42_ATTRIBUTE_STRIKE_OUT);
				break;
			case 0x93:
				listener->attributeChange(false, WP42_ATTRIBUTE_STRIKE_OUT);
				break;
			case 0x94:
				listener->attributeChange(true, WP42_ATTRIBUTE_UNDERLINE);
				break;
			case 0x95:
				listener->attributeChange(false, WP42_ATTRIBUTE_UNDERLINE);
				break;

			case 0x90:
				listener->attributeChange(true, WP42_ATTRIBUTE_REDLINE);
				break;
			case 0x91:
				listener->attributeChange(false, WP42_ATTRIBUTE_REDLINE);
				break;

			case 0x9C:
				listener->attributeChange(false, WP42_ATTRIBUTE_BOLD);
				break;
			case 0x9D:
				listener->attributeChange(true, WP42_ATTRIBUTE_BOLD);
				break;

			case 0xB2:
				listener->attributeChange(true, WP42_ATTRIBUTE_ITALICS);
				break;
			case 0xB3:
				listener->attributeChange(false, WP42_ATTRIBUTE_ITALICS);
				break;
			case 0xB4:
				listener->attributeChange(true, WP42_ATTRIBUTE_SHADOW);
				break;
			case 0xB5:
				listener->attributeChange(false, WP42_ATTRIBUTE_SHADOW);
				break;

			default:
				// unsupported or undocumented token, ignore
				break;
			}
		}
		else if (readVal >= (unsigned char)0xC0 && readVal <= (unsigned char)0xFE)
		{
			std::unique_ptr<WP42Part> part(WP42Part::constructPart(input, encryption, readVal));
			if (part)
				part->parse(listener);
		}
		// ignore the rest since they are not documented and at least 0xFF is a special character that
		// marks end of variable length part in variable length multi-byte functions
	}
}

void WP42Parser::parse(librevenge::RVNGTextInterface *documentInterface)
{
	librevenge::RVNGInputStream *input = getInput();
	WPXEncryption *encryption = getEncryption();
	std::list<WPXPageSpan> pageList;
	std::vector<WP42SubDocument *> subDocuments;

	try
	{
		// do a "first-pass" parse of the document
		// gather table border information, page properties (per-page)
		WP42StylesListener stylesListener(pageList, subDocuments);
		parse(input, encryption, &stylesListener);

		// postprocess the pageList == remove duplicate page spans due to the page breaks
		std::list<WPXPageSpan>::iterator previousPage = pageList.begin();
		for (std::list<WPXPageSpan>::iterator Iter=pageList.begin(); Iter != pageList.end();)
		{
			if ((Iter != previousPage) && ((*previousPage)==(*Iter)))
			{
				(*previousPage).setPageSpan((*previousPage).getPageSpan() + (*Iter).getPageSpan());
				Iter = pageList.erase(Iter);
			}
			else
			{
				previousPage = Iter;
				++Iter;
			}
		}

		// second pass: here is where we actually send the messages to the target app
		// that are necessary to emit the body of the target document
		WP42ContentListener listener(pageList, subDocuments, documentInterface);
		parse(input, encryption, &listener);

		// cleanup section: free the used resources
		for (auto &subDocument : subDocuments)
		{
			if (subDocument)
				delete subDocument;
		}
	}
	catch (FileException)
	{
		WPD_DEBUG_MSG(("WordPerfect: File Exception. Parse terminated prematurely."));

		for (auto &subDocument : subDocuments)
		{
			if (subDocument)
				delete subDocument;
		}

		throw FileException();
	}

}

void WP42Parser::parseSubDocument(librevenge::RVNGTextInterface *documentInterface)
{
	std::list<WPXPageSpan> pageList;
	std::vector<WP42SubDocument *> subDocuments;

	librevenge::RVNGInputStream *input = getInput();

	try
	{
		WP42StylesListener stylesListener(pageList, subDocuments);
		stylesListener.startSubDocument();
		parseDocument(input, nullptr, &stylesListener);
		stylesListener.endSubDocument();

		WP42ContentListener listener(pageList, subDocuments, documentInterface);
		listener.startSubDocument();
		parseDocument(input, nullptr, &listener);
		listener.endSubDocument();
		for (auto &subDocument : subDocuments)
			if (subDocument)
				delete subDocument;
	}
	catch (FileException)
	{
		WPD_DEBUG_MSG(("WordPerfect: File Exception. Parse terminated prematurely."));
		for (auto &subDocument : subDocuments)
			if (subDocument)
				delete subDocument;
		throw FileException();
	}
}
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