#!/bin/bash

set -eu

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
cd "$DIR/libgdal"

GDAL_VERSION=3.2.0
dir_gdal=./gdal
dir_formats_gyp=./gyp-formats
dir_gyp_templates=./gyp-templates

#
# download gdal source
#

rm -rf $dir_gdal
if [[ ! -f gdal-${GDAL_VERSION}.tar.gz ]]; then
	curl -L http://download.osgeo.org/gdal/${GDAL_VERSION}/gdal-${GDAL_VERSION}.tar.gz -o gdal-${GDAL_VERSION}.tar.gz
fi
tar -xzf gdal-${GDAL_VERSION}.tar.gz
mv gdal-${GDAL_VERSION} $dir_gdal
mv $dir_gdal/gcore/gdal_version.h.in $dir_gdal/gcore/gdal_version.h
#
# apply patches
#

#patch $dir_gdal/gcore/gdal_priv.h < patches/gcore_gdal_priv.diff # clang support
#patch $dir_gdal/frmts/wms/gdalwmsdataset.cpp < patches/frmts_wms_gdalwmsdataset.diff # fixes error in wms driver
patch $dir_gdal/ogr/ogrsf_frmts/shape/shptree.c < patches/ogrsf_frmts_shape_shptree.diff # fixes INT_MAX undeclared error
patch $dir_gdal/gcore/gdalexif.cpp < patches/gcore_gdalexif.diff # fixes MSVC++ internal compiler error (https://github.com/naturalatlas/node-gdal/issues/45)
patch $dir_gdal/ogr/ogrsf_frmts/shape/shpopen.c < patches/ogrsf_frmts_shape_shpopenc.diff # missing cpl_port.h
patch $dir_gdal/ogr/ogrsf_frmts/shape/dbfopen.c < patches/ogrsf_frmts_shape_dbfopen.diff
patch $dir_gdal/ogr/ogrsf_frmts/shape/sbnsearch.c < patches/ogrsf_frmts_shape_sbnsearch.diff
patch $dir_gdal/frmts/blx/blx.c < patches/frmts_blx_blxc.diff # missing cpl_port.h
patch $dir_gdal/frmts/sdts/sdts2shp.cpp < patches/frmts_sdts_switches.diff # bad syntax

#
# create format gyps
#

GDAL_FORMATS="gtiff hfa aigrid aaigrid ceos ceos2 iso8211 xpm
	sdts raw dted mem jdem envisat elas fit vrt usgsdem l1b
	nitf bmp pcidsk airsar rs2 ilwis rmf leveller sgi srtmhgt
	idrisi gsg ingr ers jaxapalsar dimap gff cosar pds adrg
	coasp tsx terragen blx til r northwood saga xyz hf2
	kmlsuperoverlay ctg e00grid zmap ngsgeoid iris map zlib
	jpeg png mbtiles
	${OPT_GDAL_FORMATS:-}"

OGR_FORMATS="shape vrt avc geojson mem mitab kml gpx aeronavfaa
	bna dxf csv edigeo geoconcept georss gml gmt gpsbabel gtm htf
	idrisi dgn openair openfilegdb pds pgdump rec s57 sdts segukooa
	segy sua svg sxf ntf xplane wasp sqlite gpkg mvt osm"

mkdir -p $dir_formats_gyp

function wrap_array() {
	local serialized=
	local indent="$2"
	local var=""
	local tabs=""
	for (( c=1; c<=$2; c++)) ; do tabs="\t$tabs"; done
	while read a; do
		if [ -n "$a" ]; then
			serialized=$(wrap_string "$a")
			var="$var$serialized,\n$tabs"
		fi
	done <<< "$1"
	var=$(trim_comma "$var")
	printf "%s" "$var"
}
function wrap_string() {
	local var=$(trim $1)
	printf "%s" "\"$var\""
}
function trim() {
	local var=$@
	var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
	var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
	printf "%s" "$var"
}
function trim_comma() {
	local var=$@
	var=`echo -e "$var" | perl -p -000 -e 's/[\s\n\,]+$//g'`
	printf "%s" "$var"
}

format_list_gyps=""
format_list_defs=""
format_gyp_template=`cat ${dir_gyp_templates}/libgdal_format.gyp`

function generate_formats() {
	local formats="$1"
	local directory="$2"
	local prefix="${3:-}"

	for fmt in $formats; do
		file_gyp="${dir_formats_gyp}/${prefix}${fmt}.gyp"
		target_name="libgdal_${prefix}${fmt}_frmt"
		format_target_name=$(wrap_string "$target_name")

		dir_format="${directory}/${fmt}"
		relative_dir_format=`echo ${dir_format} | awk '{print "." $0}'`
		files_src=`find ${dir_format} | egrep '\.(c|cpp)$' | awk '{print "." $0}'`
		gyp_template="${format_gyp_template}"

		format_sources=$(wrap_array "$files_src" 4)
		format_include_dirs=$(wrap_string "$relative_dir_format")

		if [[ ! -f "$file_gyp" ]]; then
			echo "Defining target: $format_target_name (\"$file_gyp\")"
			gyp_template=${gyp_template//'$TARGET_NAME'/$format_target_name}
			gyp_template=${gyp_template//'$INCLUDE_DIRS'/$format_include_dirs}
			gyp_template=${gyp_template//'$SOURCES'/$format_sources}
			echo -e "$gyp_template" > $file_gyp
		else
			echo "Skipping: $format_target_name (\"$file_gyp\")"
		fi

		if [[ $directory == *ogrsf* ]]; then
			frmt_upper=`echo $fmt | tr '[:lower:]' '[:upper:]'`
			if [[ ${frmt_upper} == "MITAB" ]]; then
				format_list_defs="$format_list_defs"$'\n'"TAB_ENABLED=1"
			fi
			format_list_defs="$format_list_defs"$'\n'"${frmt_upper}_ENABLED=1"
		else
			format_list_defs="$format_list_defs"$'\n'"FRMT_$fmt=1"
		fi

		format_list_gyps="$format_list_gyps"$'\n'"$file_gyp:$target_name"
	done
}

generate_formats "$GDAL_FORMATS" "${dir_gdal}/frmts"
generate_formats "$OGR_FORMATS" "${dir_gdal}/ogr/ogrsf_frmts" "ogr_"

#
# create format list
#

format_list_plain=`echo -e "$GDAL_FORMATS" | perl -p -000 -e 's/\s+/ /g'`
format_list_gyps=$(wrap_array "$format_list_gyps" 3)
format_list_defs=$(wrap_array "$format_list_defs" 3)

formats_gypi=`cat ${dir_gyp_templates}/libgdal_formats.gypi`
formats_gypi=${formats_gypi//'$GDAL_FORMATS'/$format_list_plain}
formats_gypi=${formats_gypi//'$GDAL_FORMAT_GYPS'/$format_list_gyps}
formats_gypi=${formats_gypi//'$GDAL_FORMAT_DEFS'/$format_list_defs}

echo -e "$formats_gypi" > libgdal_formats.gypi