#!/bin/bash

if [ $# != 8 ]; then
        echo "usage: $0 [url-front] [filepre] [url-back] [n-start] [n-end] [padding] [renamepre] [debug]"
        echo "  padding:   set to 0 for no padding"
        echo "  renamepre: set to 0 for no prefix renaming"
	echo "  debug:     set to 0 for no debug, 1 for debug"
        echo ""
        echo "  Example:  Assuming you want to download the following files:"
        echo "     http://www.site.com/dir/file-9.iso"
        echo "     http://www.site.com/dir/file-10.iso"
        echo ""
        echo "     Use the following command:"
        echo "        get-inc-preren http://www.site.com/dir/ file- .iso 9 10 0 0 0"
        echo ""
        exit 1
fi

URLFRONT=$1
FILEPRE=$2
URLBACK=$3

NSTART=$4
NEND=$5

PADDING=$6

RENAMEPRE=$7

DEBUG=$8

SEQARG=""

if [ $FILEPRE = "none" ]; then
        FILEPRE=""
fi

#if [ $PADDING = 1 ]; then
#	SEQARG=-w
#fi

if [ $RENAMEPRE = 0 ]; then
	RENAMEPRE=""
fi

if [ $DEBUG = 1 ]; then
	echo ""
	echo "Debug on... not actually downloaded... just printing urls and file names:"
else 
	DEBUG=0;
fi

for i in `seq $NSTART $NEND`; do
	if [ $PADDING = 0 ]; then
		FILENAME=$FILEPRE$i$URLBACK
	else
		case "$PADDING" in
			9)	FILENAME=$FILEPRE`printf "%09d" $i`$URLBACK
				;;
                        8)      FILENAME=$FILEPRE`printf "%08d" $i`$URLBACK
                                ;;
                        7)      FILENAME=$FILEPRE`printf "%07d" $i`$URLBACK
                                ;;
                        6)      FILENAME=$FILEPRE`printf "%06d" $i`$URLBACK
                                ;;
                        5)      FILENAME=$FILEPRE`printf "%05d" $i`$URLBACK
                                ;;
                        4)      FILENAME=$FILEPRE`printf "%04d" $i`$URLBACK
                                ;;
                        3)      FILENAME=$FILEPRE`printf "%03d" $i`$URLBACK
                                ;;
                        2)      FILENAME=$FILEPRE`printf "%02d" $i`$URLBACK
                                ;;
                        1)      FILENAME=$FILEPRE`printf "%01d" $i`$URLBACK
                                ;;
			*)	echo "Invalid padding value $PADDING... must be 1 through 9."
				exit 1
				;;
		esac
	fi
	NEWFILENAME=$RENAMEPRE$FILENAME
        if [ $DEBUG = 1 ]; then
                echo " url:$URLFRONT$FILENAME"
		echo "file:$NEWFILENAME"
		echo ""
        else
                wget $URLFRONT$FILENAME
                if [ $FILENAME != $NEWFILENAME ]; then
                        mv $FILENAME $NEWFILENAME
                fi
        fi
done