/**
 * Relational pipes
 * Copyright © 2020 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 <memory>
#include <string>
#include <vector>
#include <iostream>
#include <sstream>
#include <locale>
#include <codecvt>
#include <regex>
#include <stdexcept>

#include <relpipe/common/type/typedefs.h>
#include <relpipe/reader/TypeId.h>
#include <relpipe/reader/handlers/RelationalReaderStringHandler.h>
#include <relpipe/reader/handlers/AttributeMetadata.h>

#include "Configuration.h"
#include "INIWriter.h"
#include "INIStandardHandler.h"
#include "INILiteralHandler.h"
#include "INISectionFirstHandler.h"
#include "JavaPropertiesDialect.h"
#include "JavaManifestMFDialect.h"
#include "JavaPropertiesEscapingProcessor.h"
#include "BasicEscapingProcessor.h"
#include "uri.h"

namespace relpipe {
namespace out {
namespace ini {

class INIDispatchHandler : public relpipe::reader::handlers::RelationalReaderStringHandler {
private:
	std::ostream& output;
	INIWriter writer;
	Configuration& configuration;
	std::shared_ptr<relpipe::reader::handlers::RelationalReaderStringHandler> currentHandler;

	relpipe::reader::handlers::RelationalReaderStringHandler* createHandlerAuto(const relpipe::common::type::StringX& name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) {
		bool hasKey = false;
		bool hasValue = false;

		for (auto a : attributes) {
			if (a.getAttributeName() == L"key") hasKey = true;
			else if (a.getAttributeName() == L"value") hasValue = true;
		}

		if (hasKey && hasValue) return new INIStandardHandler(writer);
		else return new INILiteralHandler(writer);
	}

	relpipe::reader::handlers::RelationalReaderStringHandler* createHandler(const relpipe::common::type::StringX& name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) {
		for (auto rc : configuration.relationConfigurations) {
			if (std::regex_match(name, std::wregex(rc.relation))) {
				if (rc.style == Style::Standard) return new INIStandardHandler(writer);
				else if (rc.style == Style::Literal) return new INILiteralHandler(writer);
				else if (rc.style == Style::SectionFirst) return new INISectionFirstHandler(writer);
				else if (rc.style == Style::Dropped) return nullptr;
				else if (rc.style == Style::Automatic) return createHandlerAuto(name, attributes);
				else throw std::invalid_argument("Unsupported style: " + std::to_string((int) rc.style));
			}
		}

		if (configuration.relationConfigurations.size()) return nullptr;
		else return createHandlerAuto(name, attributes);
	}

public:

	INIDispatchHandler(std::ostream& output, Configuration& configuration) : output(output), writer(output), configuration(configuration) {
		// TODO: dialects might be moved to configuration (after switching to alt2xml writers)
		writer.addDialect(std::make_shared<JavaPropertiesDialect>(), dialect::JavaProperties, false);
		writer.addDialect(std::make_shared<JavaManifestMFDialect>(), dialect::JavaManifestMF, false);
		writer.addEscapingProcessor(std::make_shared<BasicEscapingProcessor>(), escaping::Basic, true);
		writer.addEscapingProcessor(std::make_shared<JavaPropertiesEscapingProcessor>(), escaping::JavaProperties, false);
		for (auto o : configuration.writerOptions) writer.setOption(o.uri, o.value);
	}

	void startRelation(relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override {
		if (currentHandler) currentHandler->endOfPipe();
		currentHandler.reset(createHandler(name, attributes));
		if (currentHandler) currentHandler->startRelation(name, attributes);
	}

	void attribute(const relpipe::common::type::StringX& value) override {
		if (currentHandler) currentHandler->attribute(value);
	}

	void endOfPipe() {
		if (currentHandler) currentHandler->endOfPipe();
		currentHandler.reset();
		writer.endDocument();
		output.flush();
	}

};

}
}
}