#!/bin/bash

rbenv_version=1.1.2
ruby_build_version=20201225
rbenv_aliases_version=1.1.0
rbenv_install_dir="/opt/rbenv"
ruby_version_path="$rbenv_install_dir/versions"
# RBENV_ROOT is the directory of rbenv, it needs to be loaded as a environment variable.
export RBENV_ROOT="$rbenv_install_dir"

# Install Ruby Version Management
#
# [internal]
#
# usage: ynh_install_rbenv
#
# Requires YunoHost version 2.7.12 or higher.
ynh_install_rbenv () {
    ynh_print_info --message="Installation of rbenv - Ruby Version Management - rbenv-${rbenv_version}/ruby-build-${ruby_build_version}"

    # Build an app.src for rbenv
    mkdir -p "../conf"
    echo "SOURCE_URL=https://github.com/rbenv/rbenv/archive/v${rbenv_version}.tar.gz
SOURCE_SUM=80ad89ffe04c0b481503bd375f05c212bbc7d44ef5f5e649e0acdf25eba86736" > "../conf/rbenv.src"
    # Download and extract rbenv
    ynh_setup_source --dest_dir="$rbenv_install_dir" --source_id=rbenv

    # Build an app.src for ruby-build
    mkdir -p "../conf"
    echo "SOURCE_URL=https://github.com/rbenv/ruby-build/archive/v${ruby_build_version}.tar.gz
SOURCE_SUM=54cae123c2758e7714c66aca7ef8bc7f29cda8583891191ceb3053c6d098ecf1" > "../conf/ruby-build.src"
    # Download and extract ruby-build
    ynh_setup_source --dest_dir="$rbenv_install_dir/plugins/ruby-build" --source_id=ruby-build

    # Build an app.src for rbenv-aliases
    mkdir -p "../conf"
    echo "SOURCE_URL=https://github.com/tpope/rbenv-aliases/archive/v${rbenv_aliases_version}.tar.gz
SOURCE_SUM=12e89bc4499e85d8babac2b02bc8b66ceb0aa3f8047b26728a3eca8a6030273d" > "../conf/rbenv-aliases.src"
    # Download and extract rbenv-aliases
    ynh_setup_source --dest_dir="$rbenv_install_dir/plugins/rbenv-aliases" --source_id=rbenv-aliases

    (cd $rbenv_install_dir
    ./src/configure && make -C src)

    # Create shims directory if needed
    if [ ! -d $rbenv_install_dir/shims ] ; then
        mkdir $rbenv_install_dir/shims
    fi
}

# Load the version of Ruby for an app, and set variables.
#
# ynh_use_ruby has to be used in any app scripts before using Ruby for the first time.
# This helper will provide alias and variables to use in your scripts.
#
# To use gem or Ruby, use the alias `ynh_gem` and `ynh_ruby`
# Those alias will use the correct version installed for the app
# For example: use `ynh_gem install` instead of `gem install`
#
# With `sudo` or `ynh_exec_as`, use instead the fallback variables `$ynh_gem` and `$ynh_ruby`
# And propagate $PATH to sudo with $ynh_ruby_load_path
# Exemple: `ynh_exec_as $app $ynh_ruby_load_path $ynh_gem install`
#
# $PATH contains the path of the requested version of Ruby.
# However, $PATH is duplicated into $ruby_path to outlast any manipulation of $PATH
# You can use the variable `$ynh_ruby_load_path` to quickly load your Ruby version
#  in $PATH for an usage into a separate script.
# Exemple: $ynh_ruby_load_path $final_path/script_that_use_gem.sh`
#
#
# Finally, to start a Ruby service with the correct version, 2 solutions
#  Either the app is dependent of Ruby or gem, but does not called it directly.
#  In such situation, you need to load PATH
#    `Environment="__YNH_RUBY_LOAD_ENV_PATH__"`
#    `ExecStart=__FINALPATH__/my_app`
#     You will replace __YNH_RUBY_LOAD_ENV_PATH__ with $ynh_ruby_load_path
#
#  Or Ruby start the app directly, then you don't need to load the PATH variable
#    `ExecStart=__YNH_RUBY__ my_app run`
#     You will replace __YNH_RUBY__ with $ynh_ruby
#
#
# one other variable is also available
#   - $ruby_path: The absolute path to Ruby binaries for the chosen version.
#
# usage: ynh_use_ruby
#
# Requires YunoHost version 2.7.12 or higher.
ynh_use_ruby () {
    ruby_version=$(ynh_app_setting_get --app=$app --key=ruby_version)
    # Get the absolute path of this version of Ruby
    ruby_path="$ruby_version_path/$YNH_APP_INSTANCE_NAME/bin"

    # Allow alias to be used into bash script
    shopt -s expand_aliases

    # Create an alias for the specific version of Ruby and a variable as fallback
    ynh_ruby="$ruby_path/ruby"
    alias ynh_ruby="$ynh_ruby"
    # And gem
    ynh_gem="$ruby_path/gem"
    alias ynh_gem="$ynh_gem"

    # Load the path of this version of Ruby in $PATH
    if [[ :$PATH: != *":$ruby_path"* ]]; then
        PATH="$ruby_path:$PATH"
    fi
    # Create an alias to easily load the PATH
    ynh_ruby_load_path="PATH=$PATH"

    # Sets the local application-specific Ruby version
    (cd $final_path
    rbenv local $ruby_version)
}

# Install a specific version of Ruby
#
# ynh_install_ruby will install the version of Ruby provided as argument by using rbenv.
#
# rbenv (Ruby Version Management) stores the target Ruby version in a .ruby_version file created in the target folder (using rbenv local <version>)
# It then uses that information for every Ruby user that uses rbenv provided Ruby command
#
# This helper creates a /etc/profile.d/rbenv.sh that configures PATH environment for rbenv
# for every LOGIN user, hence your user must have a defined shell (as opposed to /usr/sbin/nologin)
#
# Don't forget to execute ruby-dependent command in a login environment
# (e.g. sudo --login option)
# When not possible (e.g. in systemd service definition), please use direct path
# to rbenv shims (e.g. $RBENV_ROOT/shims/bundle)
#
# usage: ynh_install_ruby --ruby_version=ruby_version
# | arg: -v, --ruby_version= - Version of ruby to install.
#
# Requires YunoHost version 2.7.12 or higher.
ynh_install_ruby () {
    # Declare an array to define the options of this helper.
    local legacy_args=v
    local -A args_array=( [v]=ruby_version= )
    local ruby_version
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    # Store ruby_version into the config of this app
    ynh_app_setting_set --app=$YNH_APP_INSTANCE_NAME --key=ruby_version --value=$ruby_version

    # Create $rbenv_install_dir if doesn't exist already
    mkdir -p "$rbenv_install_dir/plugins/ruby-build"

    # Load rbenv path in PATH
    local CLEAR_PATH="$rbenv_install_dir/bin:$PATH"

    # Remove /usr/local/bin in PATH in case of Ruby prior installation
    PATH=$(echo $CLEAR_PATH | sed 's@/usr/local/bin:@@')

    # Move an existing Ruby binary, to avoid to block rbenv
    test -x /usr/bin/ruby && mv /usr/bin/ruby /usr/bin/ruby_rbenv

    # If rbenv is not previously setup, install it
    if ! type rbenv > /dev/null 2>&1
    then
        ynh_install_rbenv
    elif dpkg --compare-versions "$($rbenv_install_dir/bin/rbenv --version | cut -d" " -f2)" lt $rbenv_version
    then
        ynh_install_rbenv
    elif dpkg --compare-versions "$($rbenv_install_dir/plugins/ruby-build/bin/ruby-build --version | cut -d" " -f2)" lt $ruby_build_version
    then
        ynh_install_rbenv
    fi

    # Restore /usr/local/bin in PATH
    PATH=$CLEAR_PATH

    # And replace the old Ruby binary
    test -x /usr/bin/ruby_rbenv && mv /usr/bin/ruby_rbenv /usr/bin/ruby

    # Install the requested version of Ruby
    ynh_print_info --message="Installation of Ruby-"$ruby_version
    CONFIGURE_OPTS="--disable-install-doc --with-jemalloc" MAKE_OPTS="-j2" rbenv install --skip-existing $ruby_version

    # Remove app virtualenv
    if  `rbenv alias --list | grep --quiet "$YNH_APP_INSTANCE_NAME" 1>/dev/null 2>&1`
    then
        rbenv alias $YNH_APP_INSTANCE_NAME --remove
    fi

    # Create app virtualenv
    rbenv alias $YNH_APP_INSTANCE_NAME $ruby_version

    # Cleanup Ruby versions
    ynh_cleanup_ruby

    # Set environment for Ruby users
    echo  "#rbenv
export RBENV_ROOT=$rbenv_install_dir
export PATH=\"$rbenv_install_dir/bin:$PATH\"
eval \"\$(rbenv init -)\"
    #rbenv" > /etc/profile.d/rbenv.sh

    # Load the environment
    eval "$(rbenv init -)"
}

# Remove the version of Ruby used by the app.
#
# This helper will also cleanup Ruby versions
#
# usage: ynh_remove_ruby
ynh_remove_ruby () {
    local ruby_version=$(ynh_app_setting_get --app=$YNH_APP_INSTANCE_NAME --key=ruby_version)

    # Load rbenv path in PATH
    local CLEAR_PATH="$rbenv_install_dir/bin:$PATH"

    # Remove /usr/local/bin in PATH in case of Ruby prior installation
    PATH=$(echo $CLEAR_PATH | sed 's@/usr/local/bin:@@')

    rbenv alias $YNH_APP_INSTANCE_NAME --remove

    # Remove the line for this app
    ynh_app_setting_delete --app=$YNH_APP_INSTANCE_NAME --key=ruby_version

    # Cleanup Ruby versions
    ynh_cleanup_ruby
}

# Remove no more needed versions of Ruby used by the app.
#
# This helper will check what Ruby version are no more required,
# and uninstall them
# If no app uses Ruby, rbenv will be also removed.
#
# usage: ynh_cleanup_ruby
ynh_cleanup_ruby () {

    # List required Ruby version
    local installed_apps=$(yunohost app list | grep -oP 'id: \K.*$')
    local required_ruby_versions=""
    for installed_app in $installed_apps
    do
        local installed_app_ruby_version=$(yunohost app setting $installed_app ruby_version)
        if [[ $installed_app_ruby_version ]]
        then
            required_ruby_versions="${installed_app_ruby_version}\n${required_ruby_versions}"
        fi
    done
    
    # Remove no more needed Ruby version
    local installed_ruby_versions=$(rbenv versions --bare --skip-aliases | grep -Ev '/')
    for installed_ruby_version in $installed_ruby_versions
    do
        if ! `echo ${required_ruby_versions} | grep "${installed_ruby_version}" 1>/dev/null 2>&1`
        then
            ynh_print_info --message="Removing of Ruby-"$installed_ruby_version
            $rbenv_install_dir/bin/rbenv uninstall --force $installed_ruby_version
        fi
    done

    # If none Ruby version is required
    if [[ ! $required_ruby_versions ]]
    then
        # Remove rbenv environment configuration
        ynh_print_info --message="Removing of rbenv-"$rbenv_version
        ynh_secure_remove --file="$rbenv_install_dir"
        rm /etc/profile.d/rbenv.sh
    fi
}