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

declare -A aliases=(
	[7.4]='7'
	[8.0]='8 latest'
	[8.1-rc]='rc'
)

defaultDebianSuite='buster'
declare -A debianSuites=(
	#[7.4-rc]='buster'
)
defaultAlpineVersion='3.13'
declare -A alpineVersions=(
	# /usr/src/php/ext/openssl/openssl.c:551:12: error: static declaration of 'RSA_set0_key' follows non-static declaration
	# https://github.com/docker-library/php/pull/702#issuecomment-413341743
	#[7.0]='3.7'
)

self="$(basename "$BASH_SOURCE")"
cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"

if [ "$#" -eq 0 ]; then
	versions="$(jq -r 'keys | map(@sh) | join(" ")' versions.json)"
	eval "set -- $versions"
fi

# sort version numbers with highest first
IFS=$'\n'; set -- $(sort -rV <<<"$*"); unset IFS

# get the most recent commit which modified any of "$@"
fileCommit() {
	git log -1 --format='format:%H' HEAD -- "$@"
}

# get the most recent commit which modified "$1/Dockerfile" or any file COPY'd from "$1/Dockerfile"
dirCommit() {
	local dir="$1"; shift
	(
		cd "$dir"
		fileCommit \
			Dockerfile \
			$(git show HEAD:./Dockerfile | awk '
				toupper($1) == "COPY" {
					for (i = 2; i < NF; i++) {
						print $i
					}
				}
			')
	)
}

getArches() {
	local repo="$1"; shift
	local officialImagesUrl='https://github.com/docker-library/official-images/raw/master/library/'

	eval "declare -g -A parentRepoToArches=( $(
		find -name 'Dockerfile' -exec awk '
				toupper($1) == "FROM" && $2 !~ /^('"$repo"'|scratch|.*\/.*)(:|$)/ {
					print "'"$officialImagesUrl"'" $2
				}
			' '{}' + \
			| sort -u \
			| xargs bashbrew cat --format '[{{ .RepoName }}:{{ .TagName }}]="{{ join " " .TagEntry.Architectures }}"'
	) )"
}
getArches 'php'

cat <<-EOH
# this file is generated via https://github.com/docker-library/php/blob/$(fileCommit "$self")/$self

Maintainers: Tianon Gravi <admwiggin@gmail.com> (@tianon),
             Joseph Ferguson <yosifkit@gmail.com> (@yosifkit)
GitRepo: https://github.com/docker-library/php.git
EOH

# prints "$2$1$3$1...$N"
join() {
	local sep="$1"; shift
	local out; printf -v out "${sep//%/%%}%s" "$@"
	echo "${out#$sep}"
}

for version; do
	export version
	variants="$(jq -r '.[env.version].variants | map(@sh) | join(" ")' versions.json)"
	eval "variants=( $variants )"

	versionAliases=(
		$version
		${aliases[$version]:-}
	)

	for dir in "${variants[@]}"; do
		suite="$(dirname "$dir")" # "buster", etc
		variant="$(basename "$dir")" # "cli", etc
		dir="$version/$dir"
		[ -f "$dir/Dockerfile" ] || continue

		fullVersion="$(jq -r '.[env.version].version' versions.json)"

		baseAliases=( $fullVersion "${versionAliases[@]}" )
		variantAliases=( "${baseAliases[@]/%/-$variant}" )
		variantAliases=( "${variantAliases[@]//latest-/}" )

		if [ "$variant" = 'cli' ]; then
			variantAliases+=( "${baseAliases[@]}" )
		fi

		suiteVariantAliases=( "${variantAliases[@]/%/-$suite}" )
		if [ "${suite#alpine}" = "${alpineVersions[$version]:-$defaultAlpineVersion}" ] ; then
			variantAliases=( "${variantAliases[@]/%/-alpine}" )
		elif [ "$suite" != "${debianSuites[$version]:-$defaultDebianSuite}" ]; then
			variantAliases=()
		fi
		variantAliases=( "${suiteVariantAliases[@]}" ${variantAliases[@]+"${variantAliases[@]}"} )
		variantAliases=( "${variantAliases[@]//latest-/}" )

		variantParent="$(awk 'toupper($1) == "FROM" { print $2 }' "$dir/Dockerfile")"
		variantArches="${parentRepoToArches[$variantParent]}"

		if [ "$version" = '7.2' ]; then
			# PHP 7.2 doesn't compile on MIPS:
			#   /usr/src/php/ext/pcre/pcrelib/sljit/sljitNativeMIPS_common.c:506:3: error: a label can only be part of a statement and a declaration is not a statement
			#      sljit_sw fir;
			#      ^~~~~~~~
			# According to https://github.com/openwrt/packages/issues/5333 + https://github.com/openwrt/packages/pull/5335,
			# https://github.com/svn2github/pcre/commit/e5045fd31a2e171dff305665e2b921d7c93427b8#diff-291428aa92cf90de0f2486f9c2829158
			# *might* fix it, but it's likely not worth it just for PHP 7.2 on MIPS (since 7.3 and 7.4 work fine).
			variantArches="$(echo " $variantArches " | sed -e 's/ mips64le / /g')"
		fi

		commit="$(dirCommit "$dir")"

		echo
		cat <<-EOE
			Tags: $(join ', ' "${variantAliases[@]}")
			Architectures: $(join ', ' $variantArches)
			GitCommit: $commit
			Directory: $dir
		EOE
	done
done