#!/usr/bin/env bash

set -euo pipefail
IFS=$'\n\t'

[[ -z "${DEBUG}" && "${DEBUG}" == 1 ]] && set -o xtrace

__dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$__dir"

env_url="https://raw.githubusercontent.com/frappe/frappe_docker/master/installation/env-example"
docker_nginx_url="https://github.com/evertramos/docker-compose-letsencrypt-nginx-proxy-companion"
frappe_docker_url="https://github.com/frappe/frappe_docker"
env_file="$__dir/.env"

function check_root() {
  if [[ $EUID != 0 ]]; then
    echo "This script must be run as root. Login as root or use sudo." >&2
    exit 1
  fi
}

function check_git() {
  if [[ ! -x "$(command -v git)" ]]; then
    echo "Git is not installed. Please install git before continuing." >&2
    exit 1
  fi
}

function check_docker() {
  if [[ ! -x "$(command -v docker)" ]]; then
    read -rp "No docker installation found. Press Enter to install docker or ctrl+c to exit." >&2
    curl -fsSL https://get.docker.com | sh
  fi
  if [[ ! -x "$(command -v docker)" ]]; then
    echo "Docker installation failed. Exiting." >&2
    exit 1
  fi
}

function check_env() {
  if [[ ! -f "$env_file" ]]; then
    cat <<CHOOSE >&2
    No environment file found. This file is required for setting up Frappe/ERPNext Docker.
    Would you like to fetch the default environment file?
    (NOTE: You will be prompted to set it up later)
CHOOSE
    read -rp "Press Enter to fetch the configuration file, or create a .env file and re-run the script."
    curl -fsSL "$env_url" -o "$env_file"
  fi
}

function clone_repository() {
  echo "Cloning Repository: $1"
  git clone "$2"
}

function get_config() {
  if [[ -n "$2" ]]; then
    config_file="$2"
  else
    config_file="$env_file"
  fi
  line=$(grep -E "^$=" "$config_file")
  line_result=$(echo "$line" | awk -F"=" '{print $2}')
}

function get_install_version() {
  cat <<CHOOSE >&2
  Choose a version you would like to setup [current: $1]:
  1. develop (edge)
  2. version-12
  3. version-11
  Please enter your choice [1-3]:
CHOOSE
  select choice in "1" "2" "3"; do
    case ${choice} in
      1) version="edge" ;;
      2) version="version-12" ;;
      3) version="version-11" ;;
    esac
  done
}

function prompt_config() {
  # inspired by discourse_docker
  get_config "VERSION"
  local install_version=$line_result
  get_config "MYSQL_ROOT_PASSWORD"
  local mysql_password=$line_result
  get_config "SITES"
  local sites=$line_result
  get_config "LETSENCRYPT_EMAIL"
  local letsencrypt_email=$line_result

  echo "Would you like to setup networking for docker? [y/n]"
  echo "This is required if you wish to access the instance from other machines."
  select choice in "y" "n"; do
    case $choice in
      y) setup_networking=1 ;;
      n)
        setup_networking=0
        setup_letsencrypt=0
        ;;
    esac
  done
  if [[ -n "$letsencrypt_email" && "$setup_networking" -ne "0" ]]; then
    echo "Would you like to setup LetsEncrypt? [y/n]"
    select choice in "y" "n"; do
      case $choice in
        y)
          setup_letsencrypt=1
          echo "Please ensure that all the required domains point to this IP address."
          read -rp "Enter an Email Address to setup LetsEncrypt with: " letsencrypt_email
          ;;
        n)
          setup_letsencrypt=0
          echo "Skipping LetsEncrypt Setup."
          ;;
      esac
    done
  fi

  local new_value=""
  local config_state="n"

  echo

  get_install_version "$install_version"
  install_version="$version"

  while [[ "$config_state" == "n" ]]; do
    if [[ -n "$mysql_password" ]]; then
      read -srp "Enter MySQL Password [$mysql_password]: " new_value
      if [[ -n "$new_value" ]]; then
        mysql_password="$new_value"
      fi
    fi

    if [[ -n "$sites" ]]; then
      read -rp "Enter sitename to setup [$sites]: " new_value
      if [[ -n "$new_value" ]]; then
        sites="$new_value"
      fi
    fi

    if [[ "$setup_letsencrypt" != "0" ]]; then
      read -rp "Enter email address for LetsEncrypt [$letsencrypt_email]: " new_value
      if [[ -n "$new_value" ]]; then
        letsencrypt_email=$new_value
      fi
    fi

    echo "Current Configuration:"
    echo "Version: $([[ "$install_version" == "edge" ]] && echo "develop" || echo "$install_version")"
    echo "MySQL Root Password: $mysql_password"
    echo "Sites: $sites"

    if [[ "$setup_letsencrypt" != "0" ]]; then
      echo "LetsEncrypt Email Address: $letsencrypt_email"
    fi

    echo
    echo "Does this configuration look okay?"
    read -rp "Press Enter to continue, 'n' to try again, or ctrl+c to exit: " config_state
  done

  echo "Saving the current configuration file to $env_file"

  cat <<EOF >"$env_file"
VERSION=$install_version
MYSQL_ROOT_PASSWORD=$mysql_password
SITES=$sites
$([ "$setup_letsencrypt" -ne "0" ] && echo "LETSENCRYPT_EMAIL=$letsencrypt_email")
EOF
  setup_configuration=$(<"$env_file")
}

setup_user() {
  echo "The rest of the setup requires a user account."
  echo "You may use an existing account, or set up a new one right away."
  read -rp "Enter username: " username
  if grep -E "^$username" /etc/passwd >/dev/null; then
    echo "User $username already exists."
  else
    read -rsp "Enter password: " password
    password="$(perl -e 'print crypt($ARGV[0], "password")' "$password")"
    if useradd -m -p "$password" "$username" -s "$(command -v bash)"; then
      echo "User $username has been added to the system."
    else
      echo "Failed to add user to the system."
      echo "Please add a user manually and re-run the script."
      exit 1
    fi
  fi

  if ! getent group docker >/dev/null 2>&1; then
    echo "Creating group: docker"
    groupadd docker
  fi
  echo "Adding user $username to group: docker"
  usermod -aG docker "$username"
  newgrp docker
}

install() {
  if [[ "$setup_letsencrypt" != "0" && "$setup_networking" != "0" ]]; then
    echo "Setting up NGINX Proxy for LetsEncrypt"
    clone_repository "Docker Compose LetsEncrypt NGINX Proxy Companion" "$docker_nginx_url"
    cd "$(basename "$docker_nginx_url")"
    if [[ -f .env.sample ]]; then
      cp .env.sample env
    fi
    ./start.sh >/dev/null 2>&1
    cd "$(eval echo ~"$username")"
  fi

  echo "Setting up Frappe/ERPNext"
  clone_repository "Frappe/ERPNext Docker" "$frappe_docker_url"
  cd "$(basename "$frappe_docker_url")"
  echo "$setup_configuration" >.env
  echo "Enter a name for the project."
  read -rp "This project name will be used to setup the docker instance: [erpnext_docker]" project_name
  if [[ -z "$project_name" ]]; then
    echo "Setting the project name to erpnext_docker"
    project_name="erpnext_docker"
  fi

  docker-compose \
    --project-name "$project_name" \
    --project-directory . up -d \
    -f installation/docker-compose-frappe.yml \
    -f installation/docker-compose-erpnext.yml \
    -f installation/docker-compose-common.yml \
    "$( ((setup_networking == 1)) && printf %s '-f installation/docker-compose-networks.yml')"

  get_config "SITES" "$(pwd)/.env"
  local sites=$line_result

  docker exec \
    -e "SITE_NAME=$sites" \
    -e "INSTALL_ERPNEXT=1" \
    -it "$project_name"_erpnext-python_1 docker-entrypoint.sh new

  echo "Installation Complete!"
}

check_root
check_git
check_docker
check_env

prompt_config
setup_user
install