#!/bin/sh

##############################
# configuration

prefix_file="${API_PREFIX_FILE:-/app/data/api_prefix}"
db_file="${RAILS_DB_PATH:-/app/data/rynDNS.sqlite3}"
default_admin_file="${API_DEFAULT_KEY_FILE:-/app/data/api_default_admin}"
rails_bin="${RAILS_BINARY:-/app/bin/rails}"
demo_cycle="${RAILS_DEMO_RESET:-60m}"
demo_prefix="zW3If4s5"
seed_default_key_text="Created default admin with api_key" # for grep'ing the default admin key

# end configuration
##############################

function log()
{
    local time=$(date +%F_%T)
    local prefix="LOG"
    case $1 in
        ERR | ERROR)
            prefix="ERR"
            shift
            ;;
        WAR | WARNING)
            prefix="WAR"
            shift
            ;;
        INF | INFO)
            prefix="INF"
            shift
            ;;
    esac
    local func=$1; shift
    # remove any \n
    #local text=$(echo "$@"| tr '\n' '#' | sed 's|#|\\n |g')
    case "$logfile" in
        "")
            echo "[$time]:[$prefix]:[$0][$func]: $@" 2>&1
            ;;
        *)
            echo "[$time]:[$prefix]:[$0][$func]: $@" >> $logfile
            ;;
    esac
}

function random_sting()
{
  echo -n "$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w "${1:-32}" | head -n 1)"
}

function get_prefix_file()
{
  if [ -f "$prefix_file" ]; then
    echo -n "$(head -1 $prefix_file)"
  else
    new_prefix=$(random_sting 8)
    log get_prefix_file no prefix file, generating new one
    echo -n "$new_prefix" > "$prefix_file"
    echo -n "$new_prefix"
  fi
}

function set_api_prefix()
{
  if [ -z "$RAILS_API_KEY_PREFIX" ]; then
    log set_api_prefix setting prefix from file
    RAILS_API_KEY_PREFIX=$(get_prefix_file | tail -1)
    export RAILS_API_KEY_PREFIX
  else
    log set_api_prefix saving prefix from ENV to file
    echo -n "$RAILS_API_KEY_PREFIX" > "$prefix_file"
  fi
}

function demo_cleaner()
{
    while true; do
        log demo_cleaner cleaning up;
        db_setup
        # starting sleep in subshell to be able to quickly terminate
        sleep $demo_cycle &
        wait
    done
}

function demo()
{
    if [ ! -z "$RAILS_API_DEMO" ]; then
        log demo "setting prefix to $demo_prefix"
        RAILS_API_KEY_PREFIX="$demo_prefix"
        export RAILS_API_KEY_PREFIX
        log demo "setting up demo cleaner, resetting every $demo_cycle"
        demo_cleaner &
    fi
}

function db_setup()
{
  if [ ! -f $db_file ]; then
    log db_setup running first time migrations
    echo "$($rails_bin db:migrate)"
  fi
  log db_setup seeding database
  seed_log="$($rails_bin db:seed)"
  echo "$seed_log"
  # save default login to file
  default_admin=$(echo "$seed_log" | grep "$seed_default_key_text")
  [ "${#default_admin}" -gt 8 ] && echo -n "$default_admin"  > $default_admin_file
  log db_setup "see \`docker exec \$CONTAINER cat $default_admin_file\` for initial admin api_key"
}

function main()
{
  set_api_prefix
  log main prefix: $RAILS_API_KEY_PREFIX
  db_setup
  [ "$(id -u)" -eq 0 ] && log WARN main running server as root
  demo
  log main starting server
  exec $rails_bin s
}

main "$@"