#!/bin/bash

set -e

PHP_BIN_DIR="/usr/local/bin"
PHP_BINARY="$PHP_BIN_DIR/php.bin"
PHP_LAUNCHER="$PHP_BIN_DIR/php"
PHP_INI_DIR="/usr/local/etc/php"
PHP_INI_PATH="$PHP_INI_DIR/php.ini"
COMPOSER_PATH="$PHP_BIN_DIR/composer"

# 检查文件是否存在并提示覆盖
check_and_prompt() {
    local file_path=$1
    local file_name=$2

    if [ -e "$file_path" ] || [ -L "$file_path" ]; then
        read -r -p "$file_name 已存在。是否覆盖？(y/n): " choice
        if [ "$choice" != "y" ] && [ "$choice" != "Y" ]; then
            echo "跳过 $file_name 安装。"
            return 1
        fi
    fi
    return 0
}

# 检查系统架构
ARCH=$(uname -m)
OS=$(uname -s)

case "$ARCH" in
    x86_64)
        ARCH_SUFFIX="x86_64"
        ;;
    aarch64)
        ARCH_SUFFIX="aarch64"
        ;;
    arm64)
        ARCH_SUFFIX="aarch64"
        ;;
    *)
        echo "不支持的架构: $ARCH"
        exit 1
        ;;
esac

case "$OS" in
    Linux)
        OS_SUFFIX="linux"
        ;;
    Darwin)
        OS_SUFFIX="mac"
        ;;
    *)
        echo "不支持的操作系统: $OS"
        exit 1
        ;;
esac

# 新机可能没有 /usr/local/bin，安装前必须先创建。
# 如果该路径被其他文件占用，立即停止，避免 mv 把 PHP 误改名为 bin。
if [ -e "$PHP_BIN_DIR" ] && [ ! -d "$PHP_BIN_DIR" ]; then
    echo "安装失败: $PHP_BIN_DIR 已存在但不是目录。" >&2
    exit 1
fi

sudo mkdir -p "$PHP_BIN_DIR" "$PHP_INI_DIR"

TEMP_DIR=$(mktemp -d)
trap 'rm -rf "$TEMP_DIR"' EXIT

# 选择PHP版本
echo "请输入要安装的PHP版本 (8.1-8.4):"
read -r PHP_VERSION

# 验证版本号
if [[ ! "$PHP_VERSION" =~ ^8\.[1-4]$ ]]; then
    echo "无效的PHP版本: $PHP_VERSION"
    exit 1
fi

# 构造下载链接
PHP_FILENAME="php-$PHP_VERSION-$OS_SUFFIX-$ARCH_SUFFIX.tar.gz"
PHP_URL="https://download.workerman.net/php/$PHP_FILENAME"
PHP_ARCHIVE="$TEMP_DIR/$PHP_FILENAME"

# 检查并提示覆盖PHP
if check_and_prompt "$PHP_LAUNCHER" "PHP"; then
    # 下载并安装PHP
    curl -#fL "$PHP_URL" -o "$PHP_ARCHIVE"
    tar -xf "$PHP_ARCHIVE" -C "$TEMP_DIR"

    if [ ! -f "$TEMP_DIR/php" ]; then
        echo "安装失败: 压缩包中未找到 PHP 可执行文件。" >&2
        exit 1
    fi

    # 使用启动器显式加载 php.ini。下载的静态 PHP 默认不会读取 /usr/local/etc/php。
    sudo install -m 755 "$TEMP_DIR/php" "$PHP_BINARY"
    cat > "$TEMP_DIR/php-launcher" <<EOL
#!/bin/sh
exec "$PHP_BINARY" -c "$PHP_INI_PATH" "\$@"
EOL
    sudo install -m 755 "$TEMP_DIR/php-launcher" "$PHP_LAUNCHER"
fi

# 检查并备份 php.ini
BACKUP_PATH="${PHP_INI_PATH}.bak"
if [ -f "$PHP_INI_PATH" ] && [ ! -f "$BACKUP_PATH" ]; then
    sudo cp "$PHP_INI_PATH" "$BACKUP_PATH"
fi

# 生成新的 php.ini
echo "创建 $PHP_INI_PATH"
cat > "$TEMP_DIR/php.ini" <<'EOL'
openssl.cafile=/etc/ssl/certs/ca-certificates.crt
opcache.enable=1
opcache.enable_cli=1
opcache.jit=tracing
opcache.jit_buffer_size=32M
apc.enable_cli=1
memory_limit=256M
EOL
sudo install -m 644 "$TEMP_DIR/php.ini" "$PHP_INI_PATH"

# 检查并提示覆盖Composer
if check_and_prompt "$COMPOSER_PATH" "Composer"; then
    # 下载并安装Composer
    echo "安装Composer..."
    curl -#fL https://download.workerman.net/php/composer.phar -o "$TEMP_DIR/composer.phar"
    sudo install -m 755 "$TEMP_DIR/composer.phar" "$COMPOSER_PATH"
fi

# 检查并下载 CA 证书
if [ ! -f "/etc/ssl/certs/ca-certificates.crt" ]; then
    echo "下载证书..."
    sudo mkdir -p /etc/ssl/certs
    curl -#fL https://download.workerman.net/php/ca-certificates.crt -o "$TEMP_DIR/ca-certificates.crt"
    sudo install -m 644 "$TEMP_DIR/ca-certificates.crt" /etc/ssl/certs/ca-certificates.crt
    echo "CA 证书已下载并保存到 /etc/ssl/certs/ca-certificates.crt"
fi

echo "安装完成。"