/******************************************************************************
 *
 * Project:  GDAL Core
 * Purpose:  Read metadata from GeoEye imagery.
 * Author:   Alexander Lisovenko
 * Author:   Dmitry Baryshnikov, polimax@mail.ru
 *
 ******************************************************************************
 * Copyright (c) 2014-2015, NextGIS info@nextgis.ru
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include "cpl_port.h"
#include "reader_geo_eye.h"

#include <cstddef>
#include <cstdio>
#include <cstring>

#include <string>

#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_string.h"
#include "cpl_time.h"

/**
 * GDALMDReaderGeoEye()
 */
GDALMDReaderGeoEye::GDALMDReaderGeoEye(const char *pszPath,
                                       char **papszSiblingFiles)
    : GDALMDReaderBase(pszPath, papszSiblingFiles)
{

    const CPLString osBaseName = CPLGetBasenameSafe(pszPath);
    const CPLString osDirName = CPLGetDirnameSafe(pszPath);

    // get _metadata.txt file

    // split file name by _rgb_ or _pan_
    CPLString osRadixMetadataName(osBaseName);
    size_t i = osRadixMetadataName.ifind("_rgb_");
    if (i == std::string::npos)
        i = osRadixMetadataName.ifind("_pan_");
    if (i != std::string::npos)
        osRadixMetadataName.resize(i);

    // form metadata file name
    std::string osIMDSourceFilename = CPLFormFilenameSafe(
        osDirName, (osRadixMetadataName + "_metadata.txt").c_str(), nullptr);
    if (CPLCheckForFile(&osIMDSourceFilename[0], papszSiblingFiles))
    {
        m_osIMDSourceFilename = std::move(osIMDSourceFilename);
    }
    else
    {
        osIMDSourceFilename = CPLFormFilenameSafe(
            osDirName, (osRadixMetadataName + "_METADATA.txt").c_str(),
            nullptr);
        if (CPLCheckForFile(&osIMDSourceFilename[0], papszSiblingFiles))
        {
            m_osIMDSourceFilename = std::move(osIMDSourceFilename);
        }
    }

    // get _rpc.txt file

    std::string osRPBSourceFilename =
        CPLFormFilenameSafe(osDirName, (osBaseName + "_rpc").c_str(), "txt");
    if (CPLCheckForFile(&osRPBSourceFilename[0], papszSiblingFiles))
    {
        m_osRPBSourceFilename = std::move(osRPBSourceFilename);
    }
    else
    {
        osRPBSourceFilename = CPLFormFilenameSafe(
            osDirName, (osBaseName + "_RPC").c_str(), "TXT");
        if (CPLCheckForFile(&osRPBSourceFilename[0], papszSiblingFiles))
        {
            m_osRPBSourceFilename = std::move(osRPBSourceFilename);
        }
    }

    if (!m_osIMDSourceFilename.empty())
        CPLDebug("MDReaderGeoEye", "IMD Filename: %s",
                 m_osIMDSourceFilename.c_str());
    if (!m_osRPBSourceFilename.empty())
        CPLDebug("MDReaderGeoEye", "RPB Filename: %s",
                 m_osRPBSourceFilename.c_str());
}

/**
 * ~GDALMDReaderGeoEye()
 */
GDALMDReaderGeoEye::~GDALMDReaderGeoEye()
{
}

/**
 * HasRequiredFiles()
 */
bool GDALMDReaderGeoEye::HasRequiredFiles() const
{
    if (!m_osIMDSourceFilename.empty())
        return true;

    if (!m_osRPBSourceFilename.empty())
        return true;

    return false;
}

/**
 * GetMetadataFiles()
 */
char **GDALMDReaderGeoEye::GetMetadataFiles() const
{
    char **papszFileList = nullptr;
    if (!m_osIMDSourceFilename.empty())
        papszFileList = CSLAddString(papszFileList, m_osIMDSourceFilename);
    if (!m_osRPBSourceFilename.empty())
        papszFileList = CSLAddString(papszFileList, m_osRPBSourceFilename);

    return papszFileList;
}

/**
 * LoadMetadata()
 */
void GDALMDReaderGeoEye::LoadMetadata()
{
    if (m_bIsMetadataLoad)
        return;

    if (!m_osIMDSourceFilename.empty())
    {
        m_papszIMDMD = LoadIMDWktFile();
    }

    if (!m_osRPBSourceFilename.empty())
    {
        m_papszRPCMD = GDALLoadRPCFile(m_osRPBSourceFilename);
    }

    m_papszDEFAULTMD = CSLAddNameValue(m_papszDEFAULTMD, MD_NAME_MDTYPE, "GE");

    m_bIsMetadataLoad = true;

    if (nullptr == m_papszIMDMD)
    {
        return;
    }

    // extract imagery metadata
    const char *pszSatId =
        CSLFetchNameValue(m_papszIMDMD, "Source Image Metadata.Sensor");
    if (nullptr != pszSatId)
    {
        m_papszIMAGERYMD = CSLAddNameValue(m_papszIMAGERYMD, MD_NAME_SATELLITE,
                                           CPLStripQuotes(pszSatId));
    }

    const char *pszCloudCover = CSLFetchNameValue(
        m_papszIMDMD, "Source Image Metadata.Percent Cloud Cover");
    if (nullptr != pszCloudCover)
    {
        m_papszIMAGERYMD = CSLAddNameValue(m_papszIMAGERYMD, MD_NAME_CLOUDCOVER,
                                           pszCloudCover);
    }

    const char *pszDateTime = CSLFetchNameValue(
        m_papszIMDMD, "Source Image Metadata.Acquisition Date/Time");

    if (nullptr != pszDateTime)
    {
        char buffer[80];
        GIntBig timeMid = GetAcquisitionTimeFromString(pszDateTime);

        struct tm tmBuf;
        strftime(buffer, 80, MD_DATETIMEFORMAT,
                 CPLUnixTimeToYMDHMS(timeMid, &tmBuf));
        m_papszIMAGERYMD =
            CSLAddNameValue(m_papszIMAGERYMD, MD_NAME_ACQDATETIME, buffer);
    }
}

/**
 * GetAcqisitionTimeFromString()
 */
GIntBig
GDALMDReaderGeoEye::GetAcquisitionTimeFromString(const char *pszDateTime)
{
    if (nullptr == pszDateTime)
        return 0;

    int iYear;
    int iMonth;
    int iDay;
    int iHours;
    int iMin;
    int iSec = 0;

    // string example: Acquisition Date/Time: 2006-03-01 11:08 GMT

    int r = sscanf(pszDateTime, "%d-%d-%d %d:%d GMT", &iYear, &iMonth, &iDay,
                   &iHours, &iMin);

    if (r != 5)
        return 0;

    struct tm tmDateTime;
    tmDateTime.tm_sec = iSec;
    tmDateTime.tm_min = iMin;
    tmDateTime.tm_hour = iHours;
    tmDateTime.tm_mday = iDay;
    tmDateTime.tm_mon = iMonth - 1;
    tmDateTime.tm_year = iYear - 1900;
    tmDateTime.tm_isdst = -1;

    return CPLYMDHMSToUnixTime(&tmDateTime);
}

/**
 * LoadWKTIMDFile()
 */
char **GDALMDReaderGeoEye::LoadIMDWktFile() const
{
    char **papszResultList = nullptr;
    char **papszLines = CSLLoad(m_osIMDSourceFilename);
    bool bBeginSection = false;
    CPLString osSection;
    CPLString osKeyLevel1;
    CPLString osKeyLevel2;
    CPLString osKeyLevel3;
    int nLevel = 0;
    int nSpaceCount;

    if (papszLines == nullptr)
        return nullptr;

    for (int i = 0; papszLines[i] != nullptr; i++)
    {
        // skip section (=== or ---) lines

        if (STARTS_WITH_CI(papszLines[i], "==="))
        {
            bBeginSection = true;
            continue;
        }

        if (STARTS_WITH_CI(papszLines[i], "---") ||
            CPLStrnlen(papszLines[i], 512) == 0)
            continue;

        // check the metadata level
        nSpaceCount = 0;
        for (int j = 0; j < 11; j++)
        {
            if (papszLines[i][j] != ' ')
                break;
            nSpaceCount++;
        }

        if (nSpaceCount % 3 != 0)
            continue;  // not a metadata item
        nLevel = nSpaceCount / 3;

        const char *pszValue;
        char *pszKey = nullptr;
        pszValue = CPLParseNameValue(papszLines[i], &pszKey);

        if (nullptr != pszValue && CPLStrnlen(pszValue, 512) > 0)
        {

            CPLString osCurrentKey;
            if (nLevel == 0)
            {
                osCurrentKey = CPLOPrintf("%s", pszKey);
            }
            else if (nLevel == 1)
            {
                osCurrentKey =
                    osKeyLevel1 + "." + CPLOPrintf("%s", pszKey + nSpaceCount);
            }
            else if (nLevel == 2)
            {
                osCurrentKey = osKeyLevel1 + "." + osKeyLevel2 + "." +
                               CPLOPrintf("%s", pszKey + nSpaceCount);
            }
            else if (nLevel == 3)
            {
                osCurrentKey = osKeyLevel1 + "." + osKeyLevel2 + "." +
                               osKeyLevel3 + "." +
                               CPLOPrintf("%s", pszKey + nSpaceCount);
            }

            if (!osSection.empty())
            {
                osCurrentKey = osSection + "." + osCurrentKey;
            }

            papszResultList =
                CSLAddNameValue(papszResultList, osCurrentKey, pszValue);
        }

        if (nullptr != pszKey && CPLStrnlen(pszKey, 512) > 0)
        {
            if (bBeginSection)
            {
                osSection = CPLOPrintf("%s", pszKey);
                bBeginSection = false;
            }
            else if (nLevel == 0)
            {
                osKeyLevel1 = CPLOPrintf("%s", pszKey);
            }
            else if (nLevel == 1)
            {
                osKeyLevel2 = CPLOPrintf("%s", pszKey + nSpaceCount);
            }
            else if (nLevel == 2)
            {
                osKeyLevel3 = CPLOPrintf("%s", pszKey + nSpaceCount);
            }
        }
        else
        {
            if (bBeginSection)
            {
                osSection = CPLOPrintf("%s", papszLines[i]);
                bBeginSection = false;
            }
            else if (nLevel == 0)
            {
                osKeyLevel1 = CPLOPrintf("%s", papszLines[i]);
            }
            else if (nLevel == 1)
            {
                osKeyLevel2 = CPLOPrintf("%s", papszLines[i] + nSpaceCount);
            }
            else if (nLevel == 2)
            {
                osKeyLevel3 = CPLOPrintf("%s", papszLines[i] + nSpaceCount);
            }
        }

        CPLFree(pszKey);
    }

    CSLDestroy(papszLines);

    return papszResultList;
}