#!/bin/bash
# ensure we are running the latest version of the script from the correct branch
if [ -f /ansible/branch ];
then
    branch=`cat /ansible/branch`
else
    branch="prod"
fi

#determine if we need to download the latest version
regrab=false
if [ -f /ansible/current ]; then
    latest=`cat /ansible/current`
    echo $latest
    l_branch=`echo "$latest" | grep -Po ".+:" | grep -Po "[^:]+"`
    l_time=`echo "$latest" | grep -Po ":.+" | grep -Po "[^:]+"`
    if [ ! "$l_branch" = "$branch" ]; then
        regrab=true
    else
        c_time=`date +%s`
        if [[ `expr $c_time - $l_time` -gt 120 ]]; then
            regrab=true
        fi
    fi
else
    regrab=true
fi

if $regrab;then
    # download latest version
    curl -k "https://git.actcur.com/actcur-ansible/playbook-builder/raw/branch/$branch/build_ansible.sh" -H "accept: application/raw" -o /tmp/build_ansible.sh

    # verify that download was sucessful
    count=`grep -P "(#!/bin/bash)|(end of build_ansible.sh)" /tmp/build_ansible.sh | wc -l` 
    if [ "$count" != "3" ];then
        echo "failed to grab latest build_ansible.sh file, exiting"
        exit
    fi

    # update build_ansible file and update branch/timestamp info in current
    cp /tmp/build_ansible.sh /ansible/build_ansible.sh
    echo ${branch}:`date +%s` > /ansible/current
    
    # verify the parent script is not build_ansible.sh (to prevent the possibility of recurring until the system crashes in the case of an issue)
    me=$(basename "$0")
    parent=$(ps -o args= $PPID)
    if [[ "$parent" != *"$me"* ]];then
        /bin/bash /ansible/build_ansible.sh
    fi
    exit
fi

# install/update dependencies
pacman -Sy git --noconfirm

fqdn=`hostnamectl hostname`
curl -k "https://git.actcur.com/actcur-ansible/playbook-builder/raw/branch/$branch/playbook_templates/$fqdn" -H "accept: application/raw" -o /tmp/$fqdn

# verify file was downloaded successfully
count=`grep -P "end of file" /tmp/$fqdn | wc -l` 
if [ "$count" != "1" ];then
echo "failed to grab current playbook build file for $fqdn, exiting"
exit
fi

# build playbook, retrieve roles and add variables to roles
mkdir -p /ansible/roles/
mkdir -p /ansible/new/roles
mkdir -p /ansible/prev/roles
# delete roles from previous attempt to update them
rm -r /ansible/new/roles/*

# create base playbook
echo "- hosts: $fqdn
  become: true

  roles:" > /ansible/new/$fqdn.yml

while read line
do
  elements=()
  for e in $(echo $line | tr ":" "\n"); do elements+=("$e");done
  case ${elements[0]} in
    "role")
      # format role:role name:branch/tag to use
      # clone role repo from specific tag/branch w/o history
      git clone -b ${elements[2]} --depth 1 https://git.actcur.com/actcur-ansible/role-${elements[1]}.git /ansible/new/roles/${elements[1]}

      # verify branch was cloned successfully
      count=`ls /ansible/new/roles/${elements[1]}/ | wc -l`
      if [[ $count -lt 5 ]];then
        echo "issue grabbing role $role - dir/file count less than 9, exiting"
        exit
      fi
      echo "    - nginx-ssl" >> /ansible/new/$fqdn.yml

      # retrieve var file if it exists
      curl -k "https://git.actcur.com/actcur-ansible/playbook-builder/raw/branch/$branch/var_files/${elements[1]}/$fqdn" -H "accept: application/raw" -o /ansible/new/roles/${element[1]/vars/main.yml
      
      # verifty file was downloaded successfully
      count=`grep -P "(---)|(end of file)" /tmp/build_ansible.sh | wc -l` 
      if [ "$count" != "2" ];then
          echo "issue grabbing vars file for ${elements[0]} role on $fqdn - either file is invalid or download filed, exiting"
          exit
      fi
      ;;
    "#*")
      # this is a comment, ignore it
      ;;
    *)
      echo "skipping invalid entry in playbook build file for $fqdn"
      echo "entry: $line"
      ;;
  esac
done </tmp/$fqdn
rm -r /ansible/prev/*
mv /ansible/$fqdn.yml /ansible/prev/
mv /ansible/roles/ /ansible/prev
mv /ansible/new/* /ansible/

# end of build_ansible.sh