#!/bin/bash

#This program is free software; you can redistribute it and/or
#modify it under the terms of the GNU General Public License
#as published by the Free Software Foundation; either version 2
#of the License, or (at your option) any later version.

#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.

#You should have received a copy of the GNU General Public License
#along with this program; if not, write to the Free Software
#Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

#default settings
dir_name="./"
dir_out="320"
bitrate="320"
rate="--cbr"

#some colors
RED='\e<1;31m'
GREEN='\e<1;32m'
BLUE='\e<1;35m'
NC='\e<0m'

#Help function
function script_help {
    echo -e "${GREEN}Simple script to decode FLAC to MP3 format"
    echo -e "Author: ${RED} NickNill (http://welinux.ru/user/NickNill)"
    echo -e "${GREEN}WARNING: ${RED}it can just decode flac to MP3. You need lame and flac packages!"
    echo -e "${GREEN}Usage: ${BLUE}\n\t./script -d${NC} (Path to directory or files with FLAC.Default is current dir)"
    echo -e "\t\t<${BLUE}-b${NC} MP3 bitrate (default 320)> \n\t\t<${BLUE}-r${NC} Rate type (${BLUE}cbr,abr,vbr${NC}) For abr and vbr must have quality variable. See example.>"
    echo -e "\t\t<${BLUE}-o${NC} Output Dir (default dir is ${BLUE}320${NC} in current directory) > \n\t\t<${BLUE}-s ${NC}Create subdirs (they will be created same as in source dir)>"
    echo -e "\t\t<${BLUE}-l "options"${NC} Additional options to lame encoder. Must be last in command line! For experts only!> \n${GREEN}Example:${RED} -r abr 160 (The allowed range is 8 - 310) ${NC} or ${RED} -r vbr 5 (The allowed range of n is 0 - 9. 0 - highest quality).${NC}"
    echo -e "${RED}If you dont know what means theese flags - you don't need it ;) Just use ${GREEN} -d ${RED} and maybe ${GREEN} -s ${RED} flags."
    echo -e "${GREEN}Have fun!${NC}"
}

#parsing needed parameters
i=("$@")
num=$#
if < "$num" -eq "0" > ; then
    script_help
    exit 0
fi
a=0
while < "$a" -le  "$num" >;
do
##help
if < "${i<$a>}" == "-h" > || < "${i<$a>}" == "--help" > ; then
    script_help
    exit 0;
fi
##if checks true then initialise vars
if < "$dir" == '1' > && < -e "${i<$a>}" > ; then
    dir_name="${i<$a>}"
    dir=0
fi
if < "$br" == '1' > ; then
    bitrate=`echo ${i<$a>} | sed 's/<^0-9>\+//g'`
    br=0
fi
if < "$rt" == '1' >   ; then
    if < "${i<$a>}" == 'abr' > ; then   
        rate="--abr"
    elif < "${i<$a>}" == 'vbr' >; then
        rate="-V"
    elif < "${i<$a>}" != 'cbr' >; then
        quality="${i<$a>}"
        rate="$rate $quality"
        rt=0
    else 
        rt=0
    fi
fi
if < "$lame" == '1' > ; then
        lame_p="$lame_p ${i<$a>}"
fi
if < "$out" == '1' > ; then
    dir_out="${i<$a>}"
    out='0'
fi

##checks
if < "${i<$a>}" == '-d' >; then
    dir='1';
fi
if < "${i<$a>}" == '-b' >; then
    br='1';
fi
if < "${i<$a>}" == '-r' >; then
    rt='1';
fi
if < "${i<$a>}" == '-o' >; then
    out='1';
fi
if < "${i<$a>}" == '-s' >; then
    sub='1';
fi
if < "${i<$a>}" == '-l' >; then
    lame='1';
fi

a=$(($a+1))
done

#list files
files=`find "$dir_name" -name "*.flac" -type f 2> /dev/null`
echo -e "${GREEN}Now I will do my work =) This is can take a while.${NC}"

echo "$files" | while read a;
do
    echo -e "${BLUE}Processing file:${NC} $a"
    ##add subdirs
    if < "$sub" == "1" > ; then 
        #remove last slash if it's exist
        dir_name=`echo $dir_name | sed 's/\/.\{0\}$//'`
        subdirs=`echo $a | sed 's/#//g' | sed "s#^$dir_name/##g" | sed 's#/\?<^ />\+.flac.\{0\}$##g'`
        dir_out="$dir_out/$subdirs"
    fi
    #if there no out dir then make it
    if < ! -d "$dir_out" > ; then     
        mkdir -p "$dir_out"
    fi
    #remove path, need only filenames
    mp3name=`echo $a | sed 's/.\+\///' | sed 's/.flac/.mp3/'`
 
    #read tags from files
    ARTIST=`metaflac "$a" --show-tag=ARTIST | sed 's/.*=//g'`
    TITLE=`metaflac "$a" --show-tag=TITLE | sed 's/.*=//g'`
    ALBUM=`metaflac "$a" --show-tag=ALBUM | sed 's/.*=//g'`
    TRACK=`metaflac "$a" --show-tag=TRACKNUMBER | sed 's/.*=//g'`
    GENRE=`metaflac "$a" --show-tag=GENRE | sed 's/.*=//g'`
    DATE=`metaflac "$a" --show-tag=DATE | sed 's/.*=//g'`
 
    #remove last slash if it's exist
    dir_out=`echo $dir_out | sed 's/\/.\{0\}$//'`
    if < "$lame" == '0' >; then 
  lame_p="-q 2"
    fi
    #Encode to mp3 with all settings
    flac -f -d -s "$a" -c |  lame $rate -b $bitrate --add-id3v2 --ta "$ARTIST" --tt "$TITLE" --tl "$ALBUM" --tg "$GENRE" --ty "$DATE" $lame_p - "$dir_out/$mp3name";
    if < -e "$dir_out/$mp3name" > ; then 
        echo -e "${BLUE}File is saved to${NC} $dirout/$mp3name"
    else
        echo -e "${RED}WARNING: There is no encoded file. Something wrong. Please read help, or contact with me!"
        exit 0
    fi
done