#!/bin/sh

# Let's set a sane environment
set -o errexit
set -o nounset

echo 'Checking environment'
if test -n "${GITHUB_WORKSPACE:-}" && test -n "${GITHUB_SHA:-}"; then
	if test -z "${1:-}"; then
		echo 'Missing commit range of the push event' >&2
		exit 1
	fi
	CI_BUILD_DIR="$GITHUB_WORKSPACE"
	CI_COMMIT_RANGE="$1"
else
	echo 'Not in a CI environment' >&2
	exit 1
fi
if test -z "${DOCKER_DISTRO:-}"; then
	echo 'DOCKER_DISTRO environment variable not set' >&2
	exit 1
fi

. "$CI_BUILD_DIR/scripts/common"

ALREADY_TESTED_EXTENSIONS=''

# Get the docker image ID for a PHP extension and a PHP version
#
# Arguments:
# $1: space-separated list with the names of the PHP extensions
# $2: the PHP version
#
# Outputs:
# the full docker image ID
getDockerImageName() {
	case "$2" in
		*)
			getDockerImageName_version="$2"
			;;
	esac
	getDockerImageName_suffix='cli'
	getDockerImageName_reqs="$CI_BUILD_DIR/data/special-requirements"
	if test -f "$getDockerImageName_reqs"; then
		IFS=' '
		for getDockerImageName_testExtension in $1; do
			if test -n "$(cat "$getDockerImageName_reqs" | grep -E "^$getDockerImageName_testExtension[ \t]+zts[ \t]*$")"; then
				getDockerImageName_suffix='zts'
			fi
		done
	fi
	getDockerImageName_imageName="$(printf 'php:%s-%s-%s' "$getDockerImageName_version" "$getDockerImageName_suffix" "$DOCKER_DISTRO")"
	case "$getDockerImageName_imageName" in
		php:5.5-cli-jessie)
			getDockerImageName_imageName='php:5.5-cli'
			;;
		php:5.5-zts-jessie)
			getDockerImageName_imageName='php:5.5-zts'
			;;
	esac
	if test -z "$(docker images -q "$getDockerImageName_imageName" 2>/dev/null)"; then
		getDockerImageName_log="$(docker pull "$getDockerImageName_imageName" 2>&1 || true)"
		if test -z "$(docker images -q "$getDockerImageName_imageName" 2>/dev/null)"; then
			if test "${getDockerImageName_log#*manifest unknown}" != "$getDockerImageName_log" || test "${getDockerImageName_log#*manifest for * not found}" != "$getDockerImageName_log"; then
				true
				return
			fi
			printf '%s\n' "$getDockerImageName_log" >&2
			exit 1
		fi
	fi
	printf '%s' "$getDockerImageName_imageName"
}

# Test an extension
#
# Arguments:
# $1: space-separated list with the names of the PHP extensions to be tested
# $2: the PHP version
#
# Return:
# 0 (true): if test passes
# 1 (false): if test fails
testExtension() {
	printf 'PHP version: %s\n' "$2"
	if test -n "$(printf '%s' "$2" | sed -E 's/^[0-9]+\.[0-9]+$//')"; then
		printf '  INVALID PHP VERSION: %s\n' "$2" >&2
		return 1
	fi
	testExtension_Image="$(getDockerImageName "$1" "$2")"
	if test $? -ne 0; then
		exit 1
	fi
	if test -z "$testExtension_Image"; then
		printf ' - Docker image not available\n'
		return 0
	fi
	printf ' - Docker image: %s\n' "$testExtension_Image"
	testExtension_out="$(mktemp)"
	if $(docker run --rm --volume "$CI_BUILD_DIR:/app" --workdir /app "$testExtension_Image" sh -c "./install-php-extensions $1 && php ./scripts/check-installed-extension.php $1" >"$testExtension_out" 2>&1); then
		rm -rf "$testExtension_out"
		printf ' - Passed\n'
		return 0
	fi
	printf ' - FAILED!\n' >&2
	tail -n500 "$testExtension_out" >&2
	rm -rf "$testExtension_out"
	return 1
}

# Test a new extension line
#
# Arguments:
# $1: the extension name
# $@: the list of PHP versions
#
# Return:
# 0 (true): if test passes
# 1 (false): if test fails
testNewExtensionLine() {
	testNewExtensionLine_rc=0
	if test $# -lt 2; then
		printf 'Missing PHP version list for the new extension %s\n' "${1:-}"
		testNewExtensionLine_rc=1
	elif ! stringInList "$1" "$ALREADY_TESTED_EXTENSIONS"; then
		printf '### TESTING NEW EXTENSION %s ###\n' "$1"
		if test -n "$(printf '%s' "$1" | sed -E 's/^[a-z][a-z0-9\-\_\.]+$//')"; then
			printf '   INVALID PHP EXTENSION NAME: %s\n' "$1" >&2
			testNewExtensionLine_rc=1
		else
			ALREADY_TESTED_EXTENSIONS="$ALREADY_TESTED_EXTENSIONS $1"
			testNewExtensionLine_extension="$1"
			while test $# -ge 2; do
				shift
				testNewExtensionLine_phpVersion="$1"
				if ! testExtension "$testNewExtensionLine_extension" "$1"; then
					testNewExtensionLine_rc=1
				fi
			done
		fi
	fi
	return $testNewExtensionLine_rc
}

# Get the list of all supported PHP versions
#
# Arguments:
# $1: space-separated list with the names of the PHP extensions to be tested
#
# Outputs:
# the space-separated list of supported PHP versions
getAllPHPVersionsForExtensions() {
	getAllPHPVersionsForExtensions_result=''
	IFS=' '
	for getAllPHPVersionsForExtensions_extension in $1; do
		getAllPHPVersionsForExtensions_this="$(getAllPHPVersionsForExtension "$getAllPHPVersionsForExtensions_extension")"
		if test -z "$getAllPHPVersionsForExtensions_this"; then
			return
		fi
		if test -z "$getAllPHPVersionsForExtensions_result"; then
			getAllPHPVersionsForExtensions_result="$getAllPHPVersionsForExtensions_this"
		else
			getAllPHPVersionsForExtensions_tmp=''
			for getAllPHPVersionsForExtensions_php1 in $getAllPHPVersionsForExtensions_this; do
				if stringInList "$getAllPHPVersionsForExtensions_php1" "$getAllPHPVersionsForExtensions_result"; then
					getAllPHPVersionsForExtensions_tmp="$getAllPHPVersionsForExtensions_tmp $getAllPHPVersionsForExtensions_php1"
				fi
			done
			getAllPHPVersionsForExtensions_result="${getAllPHPVersionsForExtensions_tmp# }"
		fi
	done
	printf '%s' "$getAllPHPVersionsForExtensions_result"
}

# Get the list of all supported PHP versions
#
# Arguments:
# $1: the names of a PHP extension to be tested
#
# Outputs:
# the space-separated list of supported PHP versions
getAllPHPVersionsForExtension() {
	getAllPHPVersionsForExtension_result=''
	while IFS= read -r getAllPHPVersionsForExtension_line; do
		getAllPHPVersionsForExtension_ok=
		IFS=' '
		for getAllPHPVersionsForExtension_chunk in $getAllPHPVersionsForExtension_line; do
			if test -z "$getAllPHPVersionsForExtension_ok"; then
				if test "$getAllPHPVersionsForExtension_chunk" = "$1"; then
					getAllPHPVersionsForExtension_ok=y
				else
					getAllPHPVersionsForExtension_ok=n
				fi
			else
				if test $getAllPHPVersionsForExtension_ok = 'y'; then
					if test -z "$getAllPHPVersionsForExtension_result"; then
						getAllPHPVersionsForExtension_result="$getAllPHPVersionsForExtension_chunk"
					else
						if ! stringInList "$getAllPHPVersionsForExtension_chunk" "$getAllPHPVersionsForExtension_result"; then
							getAllPHPVersionsForExtension_result="$getAllPHPVersionsForExtension_result $getAllPHPVersionsForExtension_chunk"
						fi
					fi
				fi
			fi
		done
	done <"$CI_BUILD_DIR/data/supported-extensions"
	printf '%s' "$getAllPHPVersionsForExtension_result"
}

# Test extensions by reading a commit message
#
# Arguments:
# $1: the commit hash
#
# Set:
# STOP_NEXT_COMMITS to 1 if we should skip next commits
#
# Return:
# 0 (true): if test passes
# 1 (false): if test fails
testExtensionsFromMessage() {
	testExtensionsFromMessage_result=0
	TEST_EXTENSIONS=
	FIRST_LINE=1
	testExtensionsFromMessage_message="$(git -C "$CI_BUILD_DIR" log --pretty='format:%B' -n 1 "$1")"
	IFS='
'
	for COMMIT_LINE in $testExtensionsFromMessage_message; do
		if test $FIRST_LINE -eq 1; then
			FIRST_LINE=0
		else
			TESTLIST=
			case "$COMMIT_LINE" in
				Test:*)
					TESTLIST=${COMMIT_LINE#Test:}
					;;
				TEST:*)
					TESTLIST=${COMMIT_LINE#TEST:}
					;;
				test:*)
					TESTLIST=${COMMIT_LINE#test:}
					;;
			esac
			if test -n "$TESTLIST"; then
				IFS=' ,;'
				for COMMIT_LINE_EXT in $TESTLIST; do
					if test $COMMIT_LINE_EXT = '-STOP-'; then
						STOP_NEXT_COMMITS=1
					elif test -z "$TEST_EXTENSIONS"; then
						TEST_EXTENSIONS=$COMMIT_LINE_EXT
					else
						if ! stringInList "$COMMIT_LINE_EXT" "$TEST_EXTENSIONS"; then
							TEST_EXTENSIONS="$TEST_EXTENSIONS $COMMIT_LINE_EXT"
						fi
					fi
				done
			fi
		fi
		IFS=' '
		for TEST_EXTENSION in $TEST_EXTENSIONS; do
			if ! stringInList "$TEST_EXTENSION" "$ALREADY_TESTED_EXTENSIONS"; then
				ALREADY_TESTED_EXTENSIONS="$ALREADY_TESTED_EXTENSIONS $TEST_EXTENSION"
				TEST_EXTENSION="$(printf '%s' "$TEST_EXTENSION" | sed 's/\+/ /g')"
				printf '### TESTING EXTENSION(S) %s ###\n' "$TEST_EXTENSION"
				for TEST_PHPVERSION in $(getAllPHPVersionsForExtensions "$TEST_EXTENSION"); do
					if ! testExtension "$TEST_EXTENSION" "$TEST_PHPVERSION"; then
						testExtensionsFromMessage_result=1
					fi
				done
			fi
		done
	done
	resetIFS
	return $testExtensionsFromMessage_result
}

STOP_NEXT_COMMITS=0
TESTS_RESULTS=0
ADDED_EXTENSION_LINE=
FOUND_ATAT=
IFS='
'
for DIFF_LINE in $(git -C "$CI_BUILD_DIR" diff --no-indent-heuristic --minimal --no-color --word-diff=none -no-renames --unified=0 "$CI_COMMIT_RANGE" -- data/supported-extensions); do
	if test -n "$DIFF_LINE"; then
		if test -z "$FOUND_ATAT"; then
			if test -z "${DIFF_LINE##@@*}"; then
				FOUND_ATAT=y
			fi
		elif test -z "${DIFF_LINE##+*}"; then
			resetIFS
			ADDED_EXTENSION_LINE="${DIFF_LINE##+}"
			if ! testNewExtensionLine $ADDED_EXTENSION_LINE; then
				TESTS_RESULTS=1
			fi
		fi
	fi
done

IFS='
'
for COMMIT_HASH in $(git -C "$CI_BUILD_DIR" log --pretty='format:%H' "$CI_COMMIT_RANGE"); do
	if ! testExtensionsFromMessage "$COMMIT_HASH"; then
		TESTS_RESULTS=1
	fi
	if test $STOP_NEXT_COMMITS -eq 1; then
		break
	fi
done

if test $TESTS_RESULTS -ne 0; then
	exit $TESTS_RESULTS
fi

if test -z "$ADDED_EXTENSION_LINE"; then
	echo 'No new extensions detected.'
fi