#!/bin/bash
set -e

dir=/usr/src/php

usage() {
	echo "usage: $0 COMMAND"
	echo
	echo "Manage php source tarball lifecycle."
	echo
	echo "Commands:"
	echo "   extract  extract php source tarball into directory $dir if not already done."
	echo "   delete   delete extracted php source located into $dir if not already done."
	echo
}

# Use PHP_VERSION for reliable version detection (avoids parsing php -v output).
PHP_VER=$(php -r 'echo PHP_VERSION;')
PHP_URL_PRIMARY="https://www.php.net/distributions/php-${PHP_VER}.tar.xz"
PHP_URL_MIRROR="https://www.php.net/get/php-${PHP_VER}.tar.xz/from/this/mirror"
PHP_URL_DOWNLOADS="https://downloads.php.net/~phpweb/php-${PHP_VER}.tar.xz"
PHP_URL_GITHUB="https://github.com/php/php-src/archive/refs/tags/php-${PHP_VER}.tar.gz"

# Download with retries and fallback URLs so 503 or php.net unavailability does not break docker-php-ext-install.
download() {
	local url="${1:?missing url}"
	echo "Downloading: ${url}"
	rm -f /tmp/php.tar.xz /tmp/php.tar.gz
	if echo "${url}" | grep -qE '\.tar\.gz($|\?)'; then
		curl -4 -fSL --retry 2 --retry-delay 2 -o /tmp/php.tar.gz "${url}"
	else
		curl -4 -fSL --retry 2 --retry-delay 2 -o /tmp/php.tar.xz "${url}"
	fi
}

extract_source() {
	rm -rf "$dir"
	mkdir -p "$dir"
	if [ -f /tmp/php.tar.xz ]; then
		tar -xJf /tmp/php.tar.xz -C "$dir" --strip-components=1
	elif [ -f /tmp/php.tar.gz ]; then
		tar -xzf /tmp/php.tar.gz -C "$dir" --strip-components=1
	else
		echo "No PHP source archive found in /tmp" >&2
		exit 1
	fi
	touch "$dir/.docker-extracted"
	rm -f /tmp/php.tar.xz /tmp/php.tar.gz
}

case "$1" in
	extract)
		mkdir -p "$dir"
		if [ ! -f "$dir/.docker-extracted" ]; then
			download "$PHP_URL_PRIMARY" \
				|| download "$PHP_URL_MIRROR" \
				|| download "$PHP_URL_DOWNLOADS" \
				|| download "$PHP_URL_GITHUB"
			extract_source
		fi
		;;

	delete)
		rm -rf "$dir"
		;;

	*)
		usage
		exit 1
		;;
esac