/**

 * Relational pipes

 * Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info)

 *

 * 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, version 3 of the License.

 *

 * 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/>.

 */

#pragma once

#include <stdexcept>

#include <libxml++-2.6/libxml++/libxml++.h>

#include "lib/INIReader.h"

#include "lib/XMLNameCodec.h"

namespace relpipe {

namespace in {

namespace xmltable {

class HierarchicalINIContentHandler : public INIContentHandler {

private:

	xmlpp::DomParser* domParser;

	XMLNameCodec nameCodec;

	xmlpp::Element* currentSection = nullptr;

public:

	HierarchicalINIContentHandler(xmlpp::DomParser* domParser) : domParser(domParser) {

	}

	virtual ~HierarchicalINIContentHandler() {

	}

	void startDocument() override {

		if (currentSection) throw std::out_of_range("Lunatic INI parser send us multiple documents.");

		currentSection = domParser->get_document()->create_root_node("ini");

	};

	void endDocument() override {

	};

	void startSection(const SectionStartEvent& event) override {

		currentSection = currentSection->add_child(nameCodec.encode(event.name));

		currentSection->set_attribute("type", "section");

		currentSection->set_attribute("name", event.name);

		if (event.comment.size()) currentSection->set_attribute("comment", event.comment);

		if (event.lineNumber >= 0) currentSection->set_attribute("line-number", std::to_string(event.lineNumber));

		if (event.eventNumber >= 0) currentSection->set_attribute("event-number", std::to_string(event.eventNumber));

	};

	void endSection() override {

		currentSection = currentSection->get_parent();

		if (currentSection == nullptr) throw std::out_of_range("Lunatic INI parser tried to end a section without starting it before.");

	};

	void entry(const EntryEvent& event) override {

		xmlpp::Element* entry = currentSection->add_child(nameCodec.encode(event.fullKey));

		entry->set_attribute("type", "entry");

		entry->set_attribute("key", event.key);

		entry->set_attribute("full-key", event.fullKey);

		if (event.subKey.size()) entry->set_attribute("sub-key", event.subKey);

		if (event.comment.size()) entry->set_attribute("comment", event.comment);

		if (event.lineNumber >= 0) entry->set_attribute("line-number", std::to_string(event.lineNumber));

		if (event.eventNumber >= 0) entry->set_attribute("event-number", std::to_string(event.eventNumber));

		entry->add_child_text(event.value);

	};

	void comment(const CommentEvent& event) override {

		xmlpp::Element* comment = currentSection->add_child("comment");

		comment->set_attribute("type", "comment");

		if (event.lineNumber >= 0) comment->set_attribute("line-number", std::to_string(event.lineNumber));

		if (event.eventNumber >= 0) comment->set_attribute("event-number", std::to_string(event.eventNumber));

		comment->add_child_text(event.comment);

	}

	void whitespace(const WhitespaceEvent& event) override {

		xmlpp::Element* comment = currentSection->add_child("whitespace");

		comment->set_attribute("type", "whitespace");

		if (event.lineNumber >= 0) comment->set_attribute("line-number", std::to_string(event.lineNumber));

		if (event.eventNumber >= 0) comment->set_attribute("event-number", std::to_string(event.eventNumber));

		comment->add_child_text(event.whitespace);

	}

};

// TODO: support also other styles/mappings e.g. <section/> and <entry/> with INI names only in the XML attributes (and thus without @type="section|entry")

// or map INI comments and whitespace to native XML comments and text nodes (but there will be no metadata like line/event numbers)

// TODO: optional namespaces (xmlns)

class XMLDocumentConstructor {

private:

	std::istream* input = nullptr;

	xmlpp::DomParser* parser = nullptr;

public:

	XMLDocumentConstructor(std::istream* input, xmlpp::DomParser* parser) : input(input), parser(parser) {

	}

	void process() {

		HierarchicalINIContentHandler handler(parser);

		std::shared_ptr<INIReader> reader(INIReader::create(*input));

		reader->process();

	}

};

}

}

}