/**

 * Relational pipes

 * Copyright © 2023 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 <cstdlib>

#include <iostream>

#include <string>

#include <sstream>

#include <vector>

#include <algorithm>

#include <exception>

#include <regex>

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

#include <relpipe/writer/typedefs.h>

namespace relpipe {

namespace in {

namespace ods {

using namespace relpipe::writer;

class ODSCommand {

private:

	std::wstring_convert<codecvt_utf8<wchar_t>> convertor;

	xmlpp::Node::PrefixNsMap ns;

	std::shared_ptr<RelationalWriter> writer;

	string_t xpath(xmlpp::Node* node, std::string xpath) {

		return convertor.from_bytes(node->eval_to_string(xpath, ns));

	}

	}

	void processRow(xmlpp::Node* r, std::vector<AttributeMetadata>& am) {

		}

	}

	void processTable(xmlpp::Node* t) {

		auto relation = xpath(t, "@t:name");

		std::vector<AttributeMetadata> metadata;

		for (xmlpp::Node* c : t->find("t:table-row[1]/t:table-cell", ns)) {

			auto name = xpath(c, "tx:p");

				metadata.push_back({name, TypeId::STRING});

			}

		}

		}

	}

public:

	ODSCommand(std::shared_ptr<RelationalWriter> writer) : writer(writer) {

		ns["o"] = "urn:oasis:names:tc:opendocument:xmlns:office:1.0";

		ns["t"] = "urn:oasis:names:tc:opendocument:xmlns:table:1.0";

		ns["tx"] = "urn:oasis:names:tc:opendocument:xmlns:text:1.0";

	}

	void process(std::istream & input) {

		xmlpp::DomParser parser;

		parser.parse_stream(input);

		xmlpp::Element* root = parser.get_document()->get_root_node();

		auto spreadsheets = root->find("/o:document/o:body/o:spreadsheet", ns);

		if (spreadsheets.size() == 1) {

			for (xmlpp::Node* table : spreadsheets[0]->find("t:table", ns)) {

				processTable(table);

			}

		} else {

			throw RelpipeWriterException(L"Invalid XML structure. "

					"Expecting OpenDocument spreadsheet.");

		}

	}

};

}

}

}