#!/bin/sh
set -e

export DEBIAN_FRONTEND=noninteractive
export DEBCONF_NONINTERACTIVE_SEEN=true

# Validate required variables
if [ -z "${PHP_VERSIONS:-}" ]; then
    echo "ERROR: PHP_VERSIONS environment variable is not set" >&2
    exit 1
fi

if [ -z "${DEF_PHP_INTERPRETER:-}" ]; then
    echo "ERROR: DEF_PHP_INTERPRETER environment variable is not set" >&2
    exit 1
fi

# Verify package availability before installation
apt-get update

# Install each PHP version with validation
for version in $PHP_VERSIONS; do
    # Validate version format (X.Y)
    if ! echo "$version" | grep -Eq '^[0-9]+\.[0-9]+$'; then
        echo "ERROR: Invalid PHP version format '$version'" >&2
        exit 1
    fi

    echo "Installing PHP $version packages..."
    if ! apt-get install -y \
        php${version}-fpm \
        php${version}-bcmath \
        php${version}-bz2 \
        php${version}-common \
        php${version}-curl \
        php${version}-dba \
        php${version}-enchant \
        php${version}-gd \
        php${version}-gmp \
        php${version}-http \
        php${version}-imap \
        php${version}-interbase \
        php${version}-intl \
        php${version}-ldap \
        php${version}-mbstring \
        php${version}-memcache \
        php${version}-memcached \
        php${version}-mysql \
        php${version}-odbc \
        php${version}-opcache \
        php${version}-pgsql \
        php${version}-ps \
        php${version}-pspell \
        php${version}-raphf \
        php${version}-readline \
        php${version}-snmp \
        php${version}-soap \
        php${version}-sqlite3 \
        php${version}-stomp \
        php${version}-sybase \
        php${version}-tidy \
        php${version}-xdebug \
        php${version}-xml \
        php${version}-xsl \
        php${version}-zip; then
        echo "ERROR: Failed to install PHP $version packages" >&2
        exit 1
    fi
done

# Set default PHP version with validation
if ! update-alternatives --set php "/usr/bin/php${DEF_PHP_INTERPRETER}"; then
    echo "ERROR: Failed to set default PHP interpreter to $DEF_PHP_INTERPRETER" >&2
    exit 1
fi