/*
 * Author:
 *   Sven Czarnian <devel@svcz.de>
 * Brief:
 *   Implements the identifier file format
 * Copyright:
 *   2021 Sven Czarnian
 * License:
 *   GNU General Public License v3 (GPLv3)
 */

#include <fstream>

#include <gsl/gsl>

#include <aman/config/IdentifierFileFormat.h>
#include <aman/helper/String.h>

using namespace aman;

IdentifierFileFormat::IdentifierFileFormat() :
        FileFormat() { }

bool IdentifierFileFormat::parse(const std::string& filename, Communication& config) {
    config.valid = true;

    std::ifstream stream(filename);
    if (false == stream.is_open()) {
        this->m_errorMessage = "Unable to open the configuration file: " + filename;
        this->m_errorLine = 0;
        config.valid = false;
        return false;
    }

    std::string line;
    std::uint32_t lineOffset = 0;
    while (std::getline(stream, line)) {
        std::string value;

        lineOffset += 1;

        /* skip a new line */
        if (0 == line.length())
            continue;

        /* trimm the line and check if a comment line is used */
        std::string trimmed = String::trim(line);
        if (0 == trimmed.find_first_of('#', 0))
            continue;

        if (0 == config.serverPublicIdentifier.length()) {
            config.serverPublicIdentifier = trimmed;
        }
        else if (0 == config.clientPublicIdentifier.length()) {
            config.clientPublicIdentifier = trimmed;
        }
        else if (0 == config.clientPrivateIdentifier.length()) {
            config.clientPrivateIdentifier = trimmed;
        }
        else {
            this->m_errorLine = lineOffset;
            this->m_errorMessage = "Invalid number of keys found";
            config.valid = false;
            return false;
        }
    }

    if (0 == lineOffset) {
        this->m_errorLine = 0;
        this->m_errorMessage = "No data found in " + filename;
        config.valid = false;
        return false;
    }

    if (0 == config.serverPublicIdentifier.length() || 0 == config.clientPublicIdentifier.length() || 0 == config.clientPrivateIdentifier.length()) {
        this->m_errorLine = 0;
        this->m_errorMessage = "Not enough keys found";
        config.valid = false;
        return false;
    }

    return true;
}