#!/bin/bash
#
# Split a media file into multiple files of equal time length
#
# Usage:
#
#    jsplit in-file out-dir interval [start] [end]
#
# in-file  : file to trim
# out-dir  : write split files to this directory (will be created if it does not exist)
# interval : time duration of output files, in seconds
# start    : when to start splitting the in-file. default is 0 (start)
# end      : when to stop splitting the in-file. default is to continue until end of file is reached
#
SCRIPT="${0}"
SCRIPT_DIR="$(cd "$(dirname "${SCRIPT}")" && pwd)"
. "${SCRIPT_DIR}"/jvc_common

IN_FILE="${1?no in-file provided}"
OUT_DIR="${2?no out-dir provided}"
if [[ -e "${OUT_DIR}" && ! -d "${OUT_DIR}" ]] ; then
  die "Not a directory: ${OUT_DIR}"
fi
mkdir -p "${OUT_DIR}" || die "Error creating ${OUT_DIR}"

INTERVAL="${3?no interval provided}"
T_START="${4}"
T_END="${5}"

echo "
{
  \"assets\": [
    { \"name\": \"input\", \"path\": \"${IN_FILE}\" }
  ],
  \"operations\": [
    {
      \"operation\": \"split\",
      \"creates\": {
        \"name\": \"splits\",
        \"dest\": \"${OUT_DIR}/\"
      },
      \"source\": \"input\",
      \"interval\": \"${INTERVAL}\"$(if [[ -n "${T_START}" ]] ; then echo ",
      \"start\": \"${T_START}\"" ; fi)$(if [[ -n "${T_END}" ]] ; then echo ",
      \"end\": \"${T_END}\"," ; fi)
    }
  ]
}
" | "${SCRIPT_DIR}"/jvc ${JVC_OPTIONS}