#include "snaverurlvalidator.h"
#include <QStringList>
#include <QDebug>

const QString SNaverUrlValidator::m_strSubDomain = "www";
const QString SNaverUrlValidator::m_strProtocol = "http";
const QString SNaverUrlValidator::m_strBaseHost = "blog.naver.com";
const QString SNaverUrlValidator::m_strSecondaryHost = "blog.me";

SNaverUrlValidator::SNaverUrlValidator(QString url) : m_isBaseHost(false), m_isSecondaryHost(false)
{
    m_strUrl = url.trimmed();
}

QString SNaverUrlValidator::makeUrl()
{
    if (!validateUrl())
    {
        return "";
    }

    QString strUrl = m_strProtocol + "://" + m_strBaseHost + "/" + m_strUserId + "/" + m_strArticleNum;
    return strUrl;
}

bool SNaverUrlValidator::validateUrl()
{
    int nStartIndex = getHostStartPosition();
    if (nStartIndex < 0)
    {
        return false;
    }

    nStartIndex = checkHost(nStartIndex);
    if (nStartIndex < 0)
    {
        return false;
    }

    if (checkPath(nStartIndex) < 0)
    {
        return false;
    }

    return true;
}

int SNaverUrlValidator::getHostStartPosition()
{
    int nHostStartPosition = m_strUrl.indexOf(':');
    if (nHostStartPosition == -1)
    {
        return 0;
    }

    if (m_strUrl.at(nHostStartPosition+1) != '/' || m_strUrl.at(nHostStartPosition+2) != '/')
    {
        return -1;
    }

    return nHostStartPosition + 3;
}

int SNaverUrlValidator::checkHost(int _nHostStartPosition)
{
    int nHostEndPosition = m_strUrl.indexOf('/', _nHostStartPosition) - 1;
    if (nHostEndPosition < 0)
    {
        return -1;
    }

    m_isBaseHost = m_strUrl.contains(m_strBaseHost);
    m_isSecondaryHost = m_strUrl.contains(m_strSecondaryHost);
    if ((m_isBaseHost == false) && (m_isSecondaryHost == false))
    {
        return -2;
    }

    if (m_isSecondaryHost)
    {
        int nHostLength = nHostEndPosition - _nHostStartPosition + 1;
        QString strHost = m_strUrl.mid(_nHostStartPosition, nHostLength);
        QStringList listHostSplit = strHost.split('.');
        for (int i=0; i<listHostSplit.count(); i++)
        {
            QString strHostSplit = listHostSplit.at(i);

            if (listHostSplit.at(i) == m_strSubDomain)
                continue;

            m_strUserId = strHostSplit;
            break;
        }
    }

    return nHostEndPosition + 2;
}

int SNaverUrlValidator::checkPath(int _nHostStartPosition)
{
    int nUrlLength = m_strUrl.length();
    int nPathLength = nUrlLength - _nHostStartPosition + 1;
    QString strPath = m_strUrl.mid(_nHostStartPosition, nPathLength);
    QStringList pathList = strPath.split('/');

    if (m_isBaseHost)
    {
        if (pathList.size() < 2)
        {
            return -1;
        }

        m_strUserId = pathList[0];
        m_strArticleNum = pathList[1];
    }

    if (m_isSecondaryHost)
    {
        if (pathList.size() < 1)
        {
            return -2;
        }

        m_strArticleNum = pathList[0];
    }

    return 0;
}