/******************************************************************************
 *
 * Project:  GDAL Core
 * Purpose:  Read metadata from DigitalGlobe 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_digital_globe.h"

#include <ctime>

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

#include "gdal_priv.h"

/**
 * GDALMDReaderDigitalGlobe()
 */
GDALMDReaderDigitalGlobe::GDALMDReaderDigitalGlobe(const char *pszPath,
                                                   char **papszSiblingFiles)
    : GDALMDReaderBase(pszPath, papszSiblingFiles),
      m_osXMLSourceFilename(
          GDALFindAssociatedFile(pszPath, "XML", papszSiblingFiles, 0)),
      m_osIMDSourceFilename(
          GDALFindAssociatedFile(pszPath, "IMD", papszSiblingFiles, 0)),
      m_osRPBSourceFilename(
          GDALFindAssociatedFile(pszPath, "RPB", papszSiblingFiles, 0))
{
    if (!m_osIMDSourceFilename.empty())
        CPLDebug("MDReaderDigitalGlobe", "IMD Filename: %s",
                 m_osIMDSourceFilename.c_str());
    if (!m_osRPBSourceFilename.empty())
        CPLDebug("MDReaderDigitalGlobe", "RPB Filename: %s",
                 m_osRPBSourceFilename.c_str());
    if (!m_osXMLSourceFilename.empty())
        CPLDebug("MDReaderDigitalGlobe", "XML Filename: %s",
                 m_osXMLSourceFilename.c_str());
}

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

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

    // check <isd>
    if (!m_osXMLSourceFilename.empty() &&
        GDALCheckFileHeader(m_osXMLSourceFilename, "<isd>"))
        return true;

    return false;
}

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

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

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

    if ((nullptr == m_papszIMDMD || nullptr == m_papszRPCMD) &&
        !m_osXMLSourceFilename.empty())
    {
        CPLXMLNode *psNode = CPLParseXMLFile(m_osXMLSourceFilename);

        if (psNode != nullptr)
        {
            CPLXMLNode *psisdNode = psNode->psNext;
            if (psisdNode != nullptr)
            {
                if (m_papszIMDMD == nullptr)
                    m_papszIMDMD =
                        LoadIMDXmlNode(CPLSearchXMLNode(psisdNode, "IMD"));
                if (m_papszRPCMD == nullptr)
                    m_papszRPCMD =
                        LoadRPBXmlNode(CPLSearchXMLNode(psisdNode, "RPB"));
            }
            CPLDestroyXMLNode(psNode);
        }
    }

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

    m_bIsMetadataLoad = true;

    if (nullptr == m_papszIMDMD)
    {
        return;
    }
    // extract imagery metadata
    const char *pszSatId = CSLFetchNameValue(m_papszIMDMD, "IMAGE.SATID");
    if (nullptr != pszSatId)
    {
        m_papszIMAGERYMD = CSLAddNameValue(m_papszIMAGERYMD, MD_NAME_SATELLITE,
                                           CPLStripQuotes(pszSatId));
    }
    else
    {
        pszSatId = CSLFetchNameValue(m_papszIMDMD, "IMAGE_1.SATID");
        if (nullptr != pszSatId)
        {
            m_papszIMAGERYMD = CSLAddNameValue(
                m_papszIMAGERYMD, MD_NAME_SATELLITE, CPLStripQuotes(pszSatId));
        }
    }

    const char *pszCloudCover =
        CSLFetchNameValue(m_papszIMDMD, "IMAGE.CLOUDCOVER");
    if (nullptr != pszCloudCover)
    {
        double fCC = CPLAtofM(pszCloudCover);
        if (fCC < 0)
        {
            m_papszIMAGERYMD = CSLAddNameValue(
                m_papszIMAGERYMD, MD_NAME_CLOUDCOVER, MD_CLOUDCOVER_NA);
        }
        else
        {
            m_papszIMAGERYMD =
                CSLAddNameValue(m_papszIMAGERYMD, MD_NAME_CLOUDCOVER,
                                CPLSPrintf("%d", int(fCC * 100)));
        }
    }
    else
    {
        pszCloudCover = CSLFetchNameValue(m_papszIMDMD, "IMAGE_1.cloudCover");
        if (nullptr != pszCloudCover)
        {
            double fCC = CPLAtofM(pszCloudCover);
            if (fCC < 0)
            {
                m_papszIMAGERYMD = CSLAddNameValue(
                    m_papszIMAGERYMD, MD_NAME_CLOUDCOVER, MD_CLOUDCOVER_NA);
            }
            else
            {
                m_papszIMAGERYMD =
                    CSLAddNameValue(m_papszIMAGERYMD, MD_NAME_CLOUDCOVER,
                                    CPLSPrintf("%d", int(fCC * 100)));
            }
        }
    }

    const char *pszDateTime =
        CSLFetchNameValue(m_papszIMDMD, "IMAGE.FIRSTLINETIME");
    if (nullptr != pszDateTime)
    {
        GIntBig timeStart = GetAcquisitionTimeFromString(pszDateTime);
        char szMidDateTime[80];
        struct tm tmBuf;
        strftime(szMidDateTime, 80, MD_DATETIMEFORMAT,
                 CPLUnixTimeToYMDHMS(timeStart, &tmBuf));

        m_papszIMAGERYMD = CSLAddNameValue(m_papszIMAGERYMD,
                                           MD_NAME_ACQDATETIME, szMidDateTime);
    }
    else
    {
        pszDateTime = CSLFetchNameValue(m_papszIMDMD, "IMAGE_1.firstLineTime");
        if (nullptr != pszDateTime)
        {
            GIntBig timeStart = GetAcquisitionTimeFromString(pszDateTime);
            char szMidDateTime[80];
            struct tm tmBuf;
            strftime(szMidDateTime, 80, MD_DATETIMEFORMAT,
                     CPLUnixTimeToYMDHMS(timeStart, &tmBuf));

            m_papszIMAGERYMD = CSLAddNameValue(
                m_papszIMAGERYMD, MD_NAME_ACQDATETIME, szMidDateTime);
        }
    }
}

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

    return papszFileList;
}

/**
 * GDALLoadIMDXmlNode()
 */
char **GDALMDReaderDigitalGlobe::LoadIMDXmlNode(CPLXMLNode *psNode)
{
    if (nullptr == psNode)
        return nullptr;
    char **papszList = nullptr;
    return ReadXMLToList(psNode->psChild, papszList);
}

/**
 * GDALLoadRPBXmlNode()
 */
static const char *const apszRPBMap[] = {RPC_ERR_BIAS,
                                         "image.errBias",
                                         RPC_ERR_RAND,
                                         "image.errRand",
                                         RPC_LINE_OFF,
                                         "image.lineOffset",
                                         RPC_SAMP_OFF,
                                         "image.sampOffset",
                                         RPC_LAT_OFF,
                                         "image.latOffset",
                                         RPC_LONG_OFF,
                                         "image.longOffset",
                                         RPC_HEIGHT_OFF,
                                         "image.heightOffset",
                                         RPC_LINE_SCALE,
                                         "image.lineScale",
                                         RPC_SAMP_SCALE,
                                         "image.sampScale",
                                         RPC_LAT_SCALE,
                                         "image.latScale",
                                         RPC_LONG_SCALE,
                                         "image.longScale",
                                         RPC_HEIGHT_SCALE,
                                         "image.heightScale",
                                         RPC_LINE_NUM_COEFF,
                                         "image.lineNumCoefList.lineNumCoef",
                                         RPC_LINE_DEN_COEFF,
                                         "image.lineDenCoefList.lineDenCoef",
                                         RPC_SAMP_NUM_COEFF,
                                         "image.sampNumCoefList.sampNumCoef",
                                         RPC_SAMP_DEN_COEFF,
                                         "image.sampDenCoefList.sampDenCoef",
                                         nullptr,
                                         nullptr};

char **GDALMDReaderDigitalGlobe::LoadRPBXmlNode(CPLXMLNode *psNode)
{
    if (nullptr == psNode)
        return nullptr;
    char **papszList = nullptr;
    papszList = ReadXMLToList(psNode->psChild, papszList);

    if (nullptr == papszList)
        return nullptr;

    char **papszRPB = nullptr;
    for (int i = 0; apszRPBMap[i] != nullptr; i += 2)
    {
        papszRPB =
            CSLAddNameValue(papszRPB, apszRPBMap[i],
                            CSLFetchNameValue(papszList, apszRPBMap[i + 1]));
    }

    CSLDestroy(papszList);

    return papszRPB;
}