#!/usr/bin/env bash

# Global variables
OPENVIDU_FOLDER=openvidu
OPENVIDU_VERSION=master

fatal_error() {
     printf "\n     =======¡ERROR!======="
     printf "\n     %s" "$1"
     printf "\n"
     exit 0
}

new_ov_installation() {
     printf '\n'
     printf '\n     ======================================='
     printf '\n          Install Openvidu CE %s' "${OPENVIDU_VERSION}"
     printf '\n     ======================================='
     printf '\n'

     # Create folder openvidu-docker-compose
     printf '\n     => Creating folder '%s'...' "${OPENVIDU_FOLDER}"
     mkdir "${OPENVIDU_FOLDER}" || fatal_error "Error while creating the folder '${OPENVIDU_FOLDER}'"

     # Download necessaries files
     printf '\n     => Downloading Openvidu CE files:'

     curl --silent https://raw.githubusercontent.com/OpenVidu/openvidu/${OPENVIDU_VERSION}/openvidu-server/docker/openvidu-docker-compose/.env \
          --output "${OPENVIDU_FOLDER}/.env" || fatal_error "Error when downloading the file '.env'"
     printf '\n          - .env'

     curl --silent https://raw.githubusercontent.com/OpenVidu/openvidu/${OPENVIDU_VERSION}/openvidu-server/docker/openvidu-docker-compose/docker-compose.override.yml \
          --output "${OPENVIDU_FOLDER}/docker-compose.override.yml" || fatal_error "Error when downloading the file 'docker-compose.override.yml'"
     printf '\n          - docker-compose.override.yml'

     curl --silent https://raw.githubusercontent.com/OpenVidu/openvidu/${OPENVIDU_VERSION}/openvidu-server/docker/openvidu-docker-compose/docker-compose.yml \
          --output "${OPENVIDU_FOLDER}/docker-compose.yml" || fatal_error "Error when downloading the file 'docker-compose.yml'"
     printf '\n          - docker-compose.yml'   

     curl --silent https://raw.githubusercontent.com/OpenVidu/openvidu/${OPENVIDU_VERSION}/openvidu-server/docker/openvidu-docker-compose/openvidu \
          --output "${OPENVIDU_FOLDER}/openvidu" || fatal_error "Error when downloading the file 'openvidu'"
     printf '\n          - openvidu'

     curl --silent https://raw.githubusercontent.com/OpenVidu/openvidu/${OPENVIDU_VERSION}/openvidu-server/docker/openvidu-docker-compose/readme.md \
          --output "${OPENVIDU_FOLDER}/readme.md" || fatal_error "Error when downloading the file 'readme.md'"
     printf '\n          - readme.md'

     # Add execution permissions
     printf "\n     => Adding permission to 'openvidu' program..."
     chmod +x "${OPENVIDU_FOLDER}/openvidu" || fatal_error "Error while adding permission to 'openvidu' program"

     # Create own certificated folder
     printf "\n     => Creating folder 'owncert'..."
     mkdir "${OPENVIDU_FOLDER}/owncert" || fatal_error "Error while creating the folder 'owncert'"

     # Ready to use
     printf '\n'
     printf '\n'
     printf '\n     ======================================='
     printf '\n     Openvidu Platform successfully installed.'
     printf '\n     ======================================='
     printf '\n'
     printf '\n     1. Go to openvidu folder:'
     printf '\n     $ cd openvidu'
     printf '\n'
     printf '\n     2. Configure DOMAIN_OR_PUBLIC_IP and OPENVIDU_SECRET in .env file:'
     printf '\n     $ nano .env' 
     printf '\n'
     printf '\n     3. Start OpenVidu'
     printf '\n     $ ./openvidu start'
     printf '\n'
     printf '\n     For more information, check readme.md'
     printf '\n'
     printf '\n'
     exit 0
}

upgrade_ov() {
     # Search local Openvidu installation
     printf '\n'
     printf '\n     ============================================'
     printf '\n       Search Previous Installation of Openvidu'
     printf '\n     ============================================'
     printf '\n'

     SEARCH_IN_FOLDERS=(
          "." 
          "/opt/openvidu"
     )

     for folder in "${SEARCH_IN_FOLDERS[@]}"; do
          printf "\n     => Searching in '%s' folder..." "${folder}"

          if [ -f "${folder}/docker-compose.yml" ]; then
               OPENVIDU_PREVIOUS_FOLDER="${folder}"

               printf "\n     => Found installation in folder '%s'" "${folder}"
               break
          fi
     done

     [ -z "${OPENVIDU_PREVIOUS_FOLDER}" ] && fatal_error "No previous Openvidu installation found"

     # Uppgrade Openvidu
     OPENVIDU_PREVIOUS_VERSION=$(grep 'Openvidu Version:' "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml" | awk '{ print $4 }')
     [ -z "${OPENVIDU_PREVIOUS_VERSION}" ] && OPENVIDU_PREVIOUS_VERSION=2.13.0

     # In this point using the variable 'OPENVIDU_PREVIOUS_VERSION' we can verify if the upgrade is 
     # posible or not. If it is not posible launch a warning and stop the upgrade.

     printf '\n'
     printf '\n     ======================================='
     printf '\n       Upgrade Openvidu CE %s to %s' "${OPENVIDU_PREVIOUS_VERSION}" "${OPENVIDU_VERSION}"
     printf '\n     ======================================='
     printf '\n'

     ROLL_BACK_FOLDER="${OPENVIDU_PREVIOUS_FOLDER}/.old-${OPENVIDU_PREVIOUS_VERSION}"
     printf "\n     Creating roll back folder '%s'..." ".old-${OPENVIDU_PREVIOUS_VERSION}"
     mkdir "${ROLL_BACK_FOLDER}" || fatal_error "Error while creating the folder '.old-${OPENVIDU_PREVIOUS_VERSION}'"

     # Move old files to roll back folder
     USE_OV_CALL=$(grep -E '^        image: openvidu/openvidu-call:2.12.0$' "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.override.yml" | tr -d '[:space:]')

     printf '\n     => Moving previous installation files:'
     mv "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml" "${ROLL_BACK_FOLDER}"
     printf '\n          - docker-compose.yml'
     mv "${OPENVIDU_PREVIOUS_FOLDER}/openvidu" "${ROLL_BACK_FOLDER}"
     printf '\n          - openvidu'
     mv "${OPENVIDU_PREVIOUS_FOLDER}/readme.md" "${ROLL_BACK_FOLDER}"
     printf '\n          - readme.md'
     if [ ! -z "${USE_OV_CALL}" ]; then
          mv "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.override.yml" "${ROLL_BACK_FOLDER}"
          printf '\n          - docker-compose.override.yml'
     fi

     # Download necessaries files
     printf '\n     => Downloading new Openvidu CE files:'

     curl --silent https://raw.githubusercontent.com/OpenVidu/openvidu/${OPENVIDU_VERSION}/openvidu-server/docker/openvidu-docker-compose/.env \
          --output "${OPENVIDU_PREVIOUS_FOLDER}/.env-${OPENVIDU_VERSION}" || fatal_error "Error when downloading the file '.env'"
     printf '\n          - .env-%s' "${OPENVIDU_VERSION}"

     if [ ! -z "${USE_OV_CALL}" ]; then
          curl --silent https://raw.githubusercontent.com/OpenVidu/openvidu/${OPENVIDU_VERSION}/openvidu-server/docker/openvidu-docker-compose/docker-compose.override.yml \
               --output "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.override.yml" || fatal_error "Error when downloading the file 'docker-compose.override.yml'"
          printf "\n          - docker-compose.override.yml"
     else 
          curl --silent https://raw.githubusercontent.com/OpenVidu/openvidu/${OPENVIDU_VERSION}/openvidu-server/docker/openvidu-docker-compose/docker-compose.override.yml \
               --output "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.override.yml-${OPENVIDU_VERSION}" || fatal_error "Error when downloading the file 'docker-compose.override.yml'"
          printf '\n          - docker-compose.override.yml-%s' "${OPENVIDU_VERSION}"
     fi

     curl --silent https://raw.githubusercontent.com/OpenVidu/openvidu/${OPENVIDU_VERSION}/openvidu-server/docker/openvidu-docker-compose/docker-compose.yml \
          --output "${OPENVIDU_PREVIOUS_FOLDER}/docker-compose.yml" || fatal_error "Error when downloading the file 'docker-compose.yml'"
     printf '\n          - docker-compose.yml'

     curl --silent https://raw.githubusercontent.com/OpenVidu/openvidu/${OPENVIDU_VERSION}/openvidu-server/docker/openvidu-docker-compose/openvidu \
          --output "${OPENVIDU_PREVIOUS_FOLDER}/openvidu" || fatal_error "Error when downloading the file 'openvidu'"
     printf '\n          - openvidu'

     curl --silent https://raw.githubusercontent.com/OpenVidu/openvidu/${OPENVIDU_VERSION}/openvidu-server/docker/openvidu-docker-compose/readme.md \
          --output "${OPENVIDU_PREVIOUS_FOLDER}/readme.md" || fatal_error "Error when downloading the file 'readme.md'"
     printf '\n          - readme.md'

     # Add execution permissions
     printf "\n     => Adding permission to 'openvidu' program..."
     chmod +x "${OPENVIDU_PREVIOUS_FOLDER}/openvidu" || fatal_error "Error while adding permission to 'openvidu' program"

     # Ready to use
     printf '\n'
     printf '\n'
     printf '\n     ======================================='
     printf '\n     Openvidu Platform successfully upgrade.'
     printf '\n     ======================================='
     printf '\n'
     printf '\n'
     exit 0
}

# Check docker and docker-compose installation
if ! command -v docker > /dev/null; then
     echo "You don't have docker installed, please install it and re-run the command"
     exit 0
fi

if ! command -v docker-compose > /dev/null; then
     echo "You don't have docker-compose installed, please install it and re-run the command"
     exit 0
else
     COMPOSE_VERSION=$(docker-compose version --short | sed "s/-rc[0-9]*//")
     if ! printf '%s\n%s\n' "1.24" "$COMPOSE_VERSION" | sort -V -C; then
          echo "You need a docker-compose version equal or higher than 1.24, please update your docker-compose and re-run the command"; \
          exit 0
     fi
fi

# Check type of installation
if [[ ! -z "$1" && "$1" == "upgrade" ]]; then
     upgrade_ov
else
     new_ov_installation
fi