#!/bin/sh

#Config
OUTPUT_DIR="/home/kikidonk/win/gp4"
START_ID="24404"
END_ID="60000"

#Init, create output dir, set total size
[[ ! -d $OUTPUT_DIR ]] && mkdir $OUTPUT_DIR
TOTAL_SIZE="0"

#For every song ID
for i in $(seq $START_ID $END_ID)
do
    #Format the id to 5-digit
	i=$(echo $i | awk '{ printf("%05d\n", $0) }')
	echo "$i" >> $OUTPUT_DIR/progress
    
    #Compute the url for the file
	URL="http://www.mysongbook.com/tab-tab_download-id_tablature=$i.htm"
    FILE_URL="$(curl -s $URL|egrep -o '<a href="files.*/.*" '|sed 's/<a href="\(.*\)".*/\1/')"
    echo "Downloading $URL"
	
	if [ "$FILE_URL" == "" ]
    then
        echo "Skipping..."
        echo "ERROR: $i" >> $OUTPUT_DIR/progress
        echo "---"
        continue
    fi
   
    if echo $FILE_URL|grep '/.zip' > /dev/null
    then
        echo "Skipping..."
        echo "ERROR: $i" >> $OUTPUT_DIR/progress
        echo "---"
        continue
    fi

    GP4_URL="http://www.mysongbook.com/$FILE_URL"
    NAME="$(echo $GP4_URL|sed 's/.*files.*\/.\/.*\/\(.*\)/\1/'|sed 's/%[0-9][0-9]//g'|tr [A-Z] [a-z])"

    curl -s -D "$OUTPUT_DIR/header" "$GP4_URL" > "$OUTPUT_DIR/$NAME"

    SIZE="$(cat $OUTPUT_DIR/header|grep Content-Length|sed 's/.*Length..\([0-9]\+\).*/\1/')"
    TOTAL_SIZE="$(echo \($TOTAL_SIZE*1024+$SIZE\)/1024|bc)"

    echo "Downloaded $NAME, Total Size:$TOTAL_SIZE KBytes"

    if echo "$NAME"|grep zip
    then
        echo "Downloaded a zip file, extracting..."
        unzip -qq -o -j -L "$OUTPUT_DIR/$NAME" -d "$OUTPUT_DIR" > /dev/null 2>&1
        rm "$OUTPUT_DIR/$NAME"
    fi
    echo "---"
done