#!/bin/sh

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

echo 'Checking environment'
if test -z "${TRAVIS_BUILD_DIR:-}"
then
	echo 'Not in a TravisCI environment' >&2
	exit 1
fi

if test -z "${TRAVIS_COMMIT_RANGE:-}"
then
	echo 'The TravisCI commit range is empty' >&2
	exit 0
fi

. "${TRAVIS_BUILD_DIR}/scripts/common"


# Get the docker image ID for a PHP extension and a PHP version
#
# Arguments:
# $1: the extension name
# $2: the PHP version
#
# Outputs:
# the full docker image ID
getExtensionImage () {
	getExtensionImage_result="php:${2}-cli"
	getExtensionImage_reqs="${TRAVIS_BUILD_DIR}/data/special-requirements"
	if test -f "${getExtensionImage_reqs}"
	then
		if test -n "$(cat "${getExtensionImage_reqs}" | grep -E "^${1}[ \t]+zts[ \t]*$")"
		then
			getExtensionImage_result="php:${2}-zts"
		fi
	fi
	printf '%s' "${getExtensionImage_result}"
}


# Test an extension
#
# Arguments:
# $1: the extension name
# $2: the PHP version
#
# Return:
# 0 (true): if test passes
# 1 (false): if test fails
testExtension () {
	printf 'PHP version: %s\n' "${2}"
	if test -n "$(printf '%s' "${2}" | sed -E 's/^[0-9]+\.[0-9]+$//')"
	then
		printf '  INVALID PHP VERSION: %s\n' "${2}" >&2
		return 0
	fi
	testExtension_Image="$(getExtensionImage "${1}" "${2}")"
	printf ' - Docker image: %s\n' "${testExtension_Image}"
	docker run --rm --volume "${TRAVIS_BUILD_DIR}:/app" --workdir /app "${testExtension_Image}" bash -c "./install-php-extensions ${1} && php -m"
}

# 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
	else
		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' "${1}" >&2
			testNewExtensionLine_rc=1
		else
			testNewExtensionLine_extension="${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}
}

TESTS_RESULTS=0
ADDED_EXTENSION_LINE=
FOUND_ATAT=
	IFS='
'
for DIFF_LINE in $(git -C "${TRAVIS_BUILD_DIR}" diff --no-indent-heuristic --minimal --no-color --word-diff=none -no-renames --unified=0 "${TRAVIS_COMMIT_RANGE:-}" -- data/supported-extensions)
do
	if test -n "${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

if test ${TESTS_RESULTS} -ne 0
then
	exit ${TESTS_RESULTS}
fi

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