#!/bin/bash
#
# Scale a media file
#
# Usage:
#
#    jscale in-file out-file factor
# or
#    jscale in-file out-file width height
#
# in-file  : file to trim
# out-file : write scaled file here
# factor   : scale factor
# width    : output width
# height   : output height
#
SCRIPT="${0}"
SCRIPT_DIR="$(cd "$(dirname "${SCRIPT}")" && pwd)"
. "${SCRIPT_DIR}"/jvc_common

IN_FILE="${1?no in-file provided}"
OUT_FILE="${2?no out-file provided}"
WIDTH="${3}"
HEIGHT="${4}"
FACTOR=""

if [[ -z "${HEIGHT}" ]] ; then
  FACTOR=${WIDTH}
  echo "
{
  \"assets\": [
    { \"name\": \"input\", \"path\": \"${IN_FILE}\" }
  ],
  \"operations\": [
    {
      \"operation\": \"scale\",
      \"creates\": {
        \"name\": \"scaled\",
        \"dest\": \"${OUT_FILE}\"
      },
      \"source\": \"input\",
      \"factor\": \"${FACTOR}\"
    }
  ]
}
" | "${SCRIPT_DIR}"/jvc ${JVC_OPTIONS}
else
    echo "
{
  \"assets\": [
    { \"name\": \"input\", \"path\": \"${IN_FILE}\" }
  ],
  \"operations\": [
    {
      \"operation\": \"scale\",
      \"creates\": {
        \"name\": \"scaled\",
        \"dest\": \"${OUT_FILE}\"
      },
      \"source\": \"input\",
      \"width\": \"${WIDTH}\",
      \"height\": \"${HEIGHT}\"
    }
  ]
}
" | "${SCRIPT_DIR}"/jvc ${JVC_OPTIONS}
fi