#!/bin/bash

#################################################################################
# ks-mp4s-folder (ks-tools) - Convert videos from folder to MP4 format (Series) #
# Date: 04-02-2022                                                              #
# Author: q3aql                                                                 #
# Contact: q3aql@duck.com                                                       #
#################################################################################
VERSION="8.4-dev"
M_DATE="040222"

# Variables
tempFile="/tmp/ks-mp4s-folder.txt"
tempFileTest="/tmp/ks-mp4s-folder-test.txt"
formatFiles="mp4 avi mpg mpeg mov wmv mkv ogv webm rm flv vob ts"

# Check cygwin alias (for Windows)
if [ -f "/usr/bin/cygwin-alias.sh" ] ; then
  shopt -s expand_aliases
  source "/usr/bin/cygwin-alias.sh"
fi

# Show help when folder is empty
if [ -z "${1}" ] ; then
  echo ""
  echo "* ks-mp4s-folder (ks-tools) v${VERSION} (${M_DATE})"
  echo ""
  echo "- Convert videos from folder to MP4 format (Series)"
  echo ""
  echo "+ Syntax: "
  echo ""
  echo "  $ ks-mp4s-folder </path/folder> [subs]"
  echo ""
  echo " + Examples: "
  echo "     $ ks-mp4s-folder /data/Westworld"
  echo "     $ ks-mp4s-folder /data/Daredevil subs"
  echo ""
  echo "* Notes:"
  echo ""
  echo " + The option 'subs' apply detection & rendering the forced subtitles."
  echo " + You must not use spaces in folders and video files."
  echo ""
  exit
fi

# Check if folder exist
if [ -d "${1}" ] ; then
  echo null > /dev/null
else
  echo ""
  echo "* ks-mp4s-folder (ks-tools) v${VERSION} (${M_DATE})"
  echo ""
  echo "+ The folder '${1}' does not exist!"
  echo ""
  exit
fi

# Scan videos files format
clear
echo ""
echo "* ks-mp4s-folder (ks-tools) v${VERSION} (${M_DATE})"
echo ""
echo "- Convert videos from folder to MP4 format (Series)"
echo ""
echo -n "* Scanning ${1} " && sleep 4
echo ""
rm -rf ${tempFile} && touch ${tempFile}
for format in ${formatFiles} ; do
  find "${1}"/*.${format} &> ${tempFileTest}
  if [ $? -ne 0 ] ; then
    echo "null" > /dev/null
  else
    echo "+ Video file(s) in .${format} found!"
    cd "${1}" && ls -1 *.${format} &>> ${tempFile}
    fail=0
  fi
done

# Init the conversion files
num_files=$(cat ${tempFile} | wc -l)
if [ ${num_files} -eq 0 ] ; then
  echo ""
  echo "+ No video file(s) found in folder '${1}"
  echo ""
  exit
else
  echo ""
  echo "* Files to convert (${1}):"
  convert_files=1
  if [ "${2}" == "subs" ] ; then
    subtitles_enabled=1
    subtitles_show="with subtitles"
  else
    subtitles_enabled=0
    subtitles_show="without subtitles"
  fi
  while [ ${convert_files} -le ${num_files} ] ; do
    show_file=$(cat ${tempFile} | head -${convert_files} | tail -1)
    echo "  + ${show_file} (${subtitles_show})"
    convert_files=$(expr ${convert_files} + 1)
  done
  echo ""
  echo "* The output folder will be '${1}/to-mp4'"
  # Execute commands for conversion
  echo ""
  echo -n "* (Default: y) Do you want run the conversion? (y/n): " ; read run_commands_ffmpeg
  if [ "${run_commands_ffmpeg}" == "n" ] ; then
    exit
  else
    convert_files=1
    cd "${1}" && mkdir -p to-mp4 && rm -rf to-mp4/*
    while [ ${convert_files} -le ${num_files} ] ; do
      show_file=$(cat ${tempFile} | head -${convert_files} | tail -1)
      if [ ${subtitles_enabled} -eq 1 ] ; then
        fname=$(echo "${show_file}" | cut -d "." -f 1)
        ks-mp4s-wrapper --conv-with-sub "${show_file}" "to-mp4/${fname}"
      else
        fname=$(echo "${show_file}" | cut -d "." -f 1)
        ks-mp4s-wrapper --conv "${show_file}" "to-mp4/${fname}"
      fi
      convert_files=$(expr ${convert_files} + 1)
    done
  fi
fi