#!/usr/bin/env bash
set -Eeuo pipefail

cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"

versions=( "$@" )
if [ ${#versions[@]} -eq 0 ]; then
	versions=( */ )
fi
versions=( "${versions[@]%/}" )

packagesUrl='https://raw.githubusercontent.com/redis/redis-hashes/master/README'
packages="$(echo "$packagesUrl" | sed -r 's/[^a-zA-Z.-]+/-/g')"
trap "$(printf 'rm -f %q' "$packages")" EXIT
curl -fsSL "$packagesUrl" -o "$packages"

for version in "${versions[@]}"; do
	rcVersion="${version%-rc}"

	line="$(
		awk '
			{ gsub(/^redis-|[.]tar[.]gz$/, "", $2) }
			$1 == "hash" && $2 ~ /^'"$rcVersion"'([.]|$)/ { print }
		' "$packages" \
			| sort -rV \
			| head -1
	)"

	if [ -n "$line" ]; then
		fullVersion="$(cut -d' ' -f2 <<<"$line")"
		downloadUrl="$(cut -d' ' -f5 <<<"$line")"
		shaHash="$(cut -d' ' -f4 <<<"$line")"
		shaType="$(cut -d' ' -f3 <<<"$line")"
	elif [ "$version" != "$rcVersion" ] && fullVersion="$(
			git ls-remote --tags https://github.com/redis/redis.git "refs/tags/$rcVersion*" \
				| cut -d/ -f3 \
				| cut -d^ -f1 \
				| sort -urV \
				| head -1
	)" && [ -n "$fullVersion" ]; then
		downloadUrl="https://github.com/redis/redis/archive/$fullVersion.tar.gz"
		shaType='sha256'
		shaHash="$(curl -fsSL "$downloadUrl" | "${shaType}sum" | cut -d' ' -f1)"
	else
		echo >&2 "error: full version for $version cannot be determined"
		exit 1
	fi
	[ "$shaType" = 'sha256' ] || [ "$shaType" = 'sha1' ]

	echo "$version: $fullVersion"

	for variant in \
		alpine 32bit '' \
	; do
		dir="$version${variant:+/$variant}"
		[ -d "$dir" ] || continue
		case "$variant" in
			32bit) template='Dockerfile.template' ;;
			*) template="Dockerfile${variant:+-$variant}.template" ;;
		esac

		sed -r \
			-e 's/^(ENV REDIS_VERSION) .*/\1 '"$fullVersion"'/' \
			-e 's!^(ENV REDIS_DOWNLOAD_URL) .*!\1 '"$downloadUrl"'!' \
			-e 's/^(ENV REDIS_DOWNLOAD_SHA) .*/\1 '"$shaHash"'/' \
			-e 's!sha[0-9]+sum!'"$shaType"'sum!g' \
			"$template" > "$dir/Dockerfile"

		if [ "$variant" = '32bit' ]; then
			sed -ri \
				-e 's/(make.*) all;/\1 32bit;/' \
				-e 's/libc6-dev/libc6-dev-i386 gcc-multilib/' \
				"$dir/Dockerfile"
		fi

		case "$version" in
			5)
				gawk -i inplace '
					$1 == "##</protected-mode-sed>##" { ia = 0 }
					!ia { print }
					$1 == "##<protected-mode-sed>##" { ia = 1; ac = 0 }
					ia { ac++ }
					ia && ac == 1 { system("grep -vE \"^#\" old-protected-mode-sed.template") }
				' "$dir/Dockerfile"
				;;
		esac
		sed -ri -e '/protected-mode-sed/d' "$dir/Dockerfile"

		# TLS support was added in 6.0, and we can't link 32bit Redis against 64bit OpenSSL (and it isn't worth going to a full foreign architecture -- just use i386/redis instead)
		if [ "$version" = '4.0' ] || [ "$version" = '5' ] || [ "$variant" = '32bit' ]; then
			sed -ri \
				-e '/libssl/d' \
				-e '/BUILD_TLS/d' \
				"$dir/Dockerfile"
		fi
	done
done