#!/bin/bash
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.

#Companion code for the blog https://cloudywindows.com
#call this code direction from the web with:
#bash <(wget -O - https://raw.githubusercontent.com/PowerShell/PowerShell/master/tools/installpsh-amazonlinux.sh) ARGUMENTS
#bash <(curl -s https://raw.githubusercontent.com/PowerShell/PowerShell/master/tools/installpsh-amazonlinux.sh) <ARGUMENTS>

#Usage - if you do not have the ability to run scripts directly from the web,
#        pull all files in this repo folder and execute, this script
#        automatically prefers local copies of sub-scripts

#Completely automated install requires a root account or sudo with a password requirement

#Switches
# -includeide         - ignored, as Amazon Linux does not have a desktop environment
# -interactivetesting - ignored, as Amazon Linux does not have a desktop environment
# -skip-sudo-check    - use sudo without verifying its availability (hard to accurately do on some distros)
# -preview            - installs the latest preview release of PowerShell side-by-side with any existing production releases

#gitrepo paths are overrideable to run from your own fork or branch for testing or private distribution


VERSION="1.2.0"
gitreposubpath="PowerShell/PowerShell/master"
gitreposcriptroot="https://raw.githubusercontent.com/$gitreposubpath/tools"
thisinstallerdistro=amazonlinux
repobased=false
gitscriptname="installpsh-amazonlinux.psh"
pwshlink=/usr/bin/pwsh

echo
echo "*** PowerShell Development Environment Installer $VERSION for $thisinstallerdistro"
echo "***    Original script is at: $gitreposcriptroot/$gitscriptname"
echo
echo "*** Arguments used: $*"
echo

# Let's quit on interrupt of subcommands
trap '
  trap - INT # restore default INT handler
  echo "Interrupted"
  kill -s INT "$$"
' INT

#Verify The Installer Choice (for direct runs of this script)
lowercase(){
    echo "$1" | tr "[:upper:]" "[:lower:]"
}

OS=$(lowercase "$(uname)")
if [ "${OS}" == "windowsnt" ]; then
    OS=windows
    DistroBasedOn=windows
elif [ "${OS}" == "darwin" ]; then
    OS=osx
    DistroBasedOn=osx
else
    OS=$(uname)
    if [ "${OS}" == "SunOS" ] ; then
        OS=solaris
        DistroBasedOn=sunos
    elif [ "${OS}" == "AIX" ] ; then
        DistroBasedOn=aix
    elif [ "${OS}" == "Linux" ] ; then
        if [ -f /etc/redhat-release ] ; then
            DistroBasedOn='redhat'
        elif [ -f /etc/system-release ] ; then
            DIST=$(sed s/\ release.*// < /etc/system-release)
            if [[ $DIST == *"Amazon Linux"* ]] ; then
                DistroBasedOn='amazonlinux'
            else
                DistroBasedOn='redhat'
            fi
        elif [ -f /etc/SuSE-release ] ; then
            DistroBasedOn='suse'
        elif [ -f /etc/mandrake-release ] ; then
            DistroBasedOn='mandrake'
        elif [ -f /etc/debian_version ] ; then
            DistroBasedOn='debian'
        fi
        if [ -f /etc/UnitedLinux-release ] ; then
            DIST="${DIST}[$( (tr "\n" ' ' | sed s/VERSION.*//) < /etc/UnitedLinux-release )]"
            DistroBasedOn=unitedlinux
        fi
        OS=$(lowercase "$OS")
        DistroBasedOn=$(lowercase "$DistroBasedOn")
    fi
fi

if [ "$DistroBasedOn" != "$thisinstallerdistro" ]; then
  echo "*** This installer is only for $thisinstallerdistro and you are running $DistroBasedOn, please run \"$gitreposcriptroot\install-powershell.sh\" to see if your distro is supported AND to auto-select the appropriate installer if it is."
  exit 1
fi

## Check requirements and prerequisites

#Check for sudo if not root
if [[ "${CI}" == "true" ]]; then
    echo "Running on CI (as determined by env var CI set to true), skipping SUDO check."
    set -- "$@" '-skip-sudo-check'
fi

SUDO=''
if (( EUID != 0 )); then
    #Check that sudo is available
    if [[ ("'$*'" =~ skip-sudo-check) && ("$(whereis sudo)" == *'/'* && "$(sudo -nv 2>&1)" != 'Sorry, user'*) ]]; then
        SUDO='sudo'
    else
        echo "ERROR: You must either be root or be able to use sudo" >&2
        #exit 5
    fi
fi

#Collect any variation details if required for this distro

#END Verify The Installer Choice

echo
echo "*** Installing prerequisites for PowerShell..."
$SUDO yum install -y \
        curl \
        libunwind \
        libicu \
        libcurl \
        openssl \
        libuuid.x86_64 \
        tar \
        gzip \
    && yum clean all

##END Check requirements and prerequisites

echo
echo "*** Installing PowerShell for $DistroBasedOn..."

echo "ATTENTION: As of version 1.2.0 this script no longer uses pre-releases unless the '-preview' switch is used"

if [[ "'$*'" =~ preview ]] ; then
    echo
    echo "-preview was used, the latest preview release will be installed (side-by-side with your production release)"
    release=$(curl https://api.github.com/repos/powershell/powershell/releases/latest | sed '/tag_name/!d' | sed s/\"tag_name\"://g | sed s/\"//g | sed s/v// | sed s/,//g | sed s/\ //g)
    pwshlink=/usr/bin/pwsh-preview
else
    echo "Finding the latest production release"
    release=$(curl https://api.github.com/repos/PowerShell/PowerShell/releases | grep -Po '"tag_name":(\d*?,|.*?[^\\]",)' | grep -Po '\d+.\d+.\d+[\da-z.-]*' | grep -v '[a-z]' | sort | tail -n1)
fi

#DIRECT DOWNLOAD
package=powershell-${release}-linux-x64.tar.gz
downloadurl=https://github.com/PowerShell/PowerShell/releases/download/v$release/$package

echo "Destination file: $package"
echo "Source URL: $downloadurl"

curl -L -o "$package" "$downloadurl"

if [[ ! -r "$package" ]]; then
    echo "ERROR: $package failed to download! Aborting..." >&2
    exit 1
fi

echo "Installing PowerShell to /opt/microsoft/powershell/$release in overwrite mode"
## Create the target folder where powershell will be placed
$SUDO mkdir -p "/opt/microsoft/powershell/$release"
## Expand powershell to the target folder
$SUDO tar zxf "$package" -C "/opt/microsoft/powershell/$release"

## Change the mode of 'pwsh' to 'rwxr-xr-x' to allow execution
$SUDO chmod 755 "/opt/microsoft/powershell/$release/pwsh"
## Create the symbolic link that points to powershell
$SUDO ln -sfn "/opt/microsoft/powershell/$release/pwsh" $pwshlink

## Add the symbolic link path to /etc/shells
if [ ! -f /etc/shells ] ; then
    echo $pwshlink | $SUDO tee /etc/shells ;
else
    grep -q "^${pwshlink}$" /etc/shells || echo $pwshlink | $SUDO tee --append /etc/shells > /dev/null ;
fi

## Remove the downloaded package file
rm -f "$package"

# shellcheck disable=SC2016
pwsh -noprofile -c '"Congratulations! PowerShell is installed at $PSHOME.
Run `"pwsh`" to start a PowerShell session."'

success=$?

if [[ "$success" != 0 ]]; then
    echo "ERROR: PowerShell failed to install!" >&2
    exit "$success"
fi

if [[ "'$*'" =~ includeide ]] ; then
    echo
    echo "Amazon Linux does not have a desktop manager to support vscode, ignoring -includeide"
fi

if [[ "'$*'" =~ -interactivetesting ]] ; then
    echo
    echo "Amazon Linux does not have a desktop manager to support vscode, ignoring -interactivetesting"
fi

if [[ "$repobased" == true ]] ; then
  echo "*** NOTE: Run your regular package manager update cycle to update PowerShell"
else
  echo "*** NOTE: Re-run this script to update PowerShell"
fi
echo "*** Install Complete"
