#!/bin/bash

# PoC to handle Evolix ansible-roles
# WARN: we use unstable for now

readonly PROGNAME=$(basename $0)
readonly PROGDIR=$(readlink -m $(dirname $0))
readonly ARGS="$@"

main(){
    local subcommand=$1

    case $subcommand in
        "help")
        sub_help
        ;;

        "list")
        sub_list
        ;;

        "install")
        local role=$2
        local install_dir=${3:-roles}

        sub_install $role $install_dir
        ;;

        "update")
        local role=$2
        local install_dir=${3:-roles}

        sub_update $role $install_dir
        ;;

        *)
        echo "error: unknwon command '${subcommand}'"
        sub_help
        ;;
    esac
}

sub_help(){
    echo ""
    echo "Usage: ansible-evogalaxy <subcommand> [options]"
    echo ""
    echo "Subcommands:"
    echo "list"
    echo "install <role> [install_dir]"
    echo "update <role> [install_dir]"
    echo ""
}

sub_list(){
    local clone_dir=$(clone_git_repository)

    list_roles $clone_dir
}

sub_install(){
    local role=$1
    local install_dir=$2

    test -d $install_dir/$role \
        && exit_role_already_installed $role

    local clone_dir=$(clone_git_repository)

    test -d $clone_dir/$role \
        || exit_role_unknown $role

    mkdir -p $install_dir \
        && mv $clone_dir/$role $install_dir/$role
}

sub_update(){
    local role=$1
    local install_dir=$2

    test -d $install_dir/$role \
        || exit_role_not_installed $role

    local clone_dir=$(clone_git_repository)

    mv $install_dir/$role $clone_dir/$role-old \
        && mv $clone_dir/$role $install_dir/$role
}

clone_git_repository() {
    local clone_dir=$(mktemp -d)
    local git_repo=https://forge.evolix.org/ansible-roles.git
    local git_branch=unstable

    git clone -q -b $git_branch $git_repo $clone_dir

    echo $clone_dir
}

list_roles(){
    local roles_dir=$1

    ls -1 $roles_dir \
        | egrep -v '(.md|.yml|Vagrant)'
}

exit_role_already_installed(){
    local role=$1

    echo "error: role '${role}' already installed"
    exit 1
}
exit_role_not_installed(){
    local role=$1

    echo "error: role '${role}' not installed"
    exit 2
}
exit_role_unknown(){
    local role=$1

    echo "error: unknown role '${role}'"
    exit 3
}

main $ARGS