#!/bin/bash
SYSTEMS="apple2 arcade atari2600 atari7800 atarilynx coleco gamegear gb gba gbc mastersystem megadrive msx n64 nes ngpc pcengine sega32x sg1000 snes vectrex virtualboy wonderswan wonderswancolor"

#check if there is any parameter
if [ "$#" -ne 1 ]; then
    echo "You must enter a system name."
    exit 0
fi

# check if the parameter is valid
if ! echo "$SYSTEMS" | grep -w "$1" > /dev/null; then
    echo "You must enter a valid system name."
    echo "Supported systemas are:"
    for WORD in $SYSTEMS
    do
         echo -e "\t$WORD"
    done
    exit 0
fi



#check if file exists
if ! test -f "$1"; then
    echo "$1 does not exists."
    exit 0
fi

#variables
readonly SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
readonly GAME_LIST_DIR="$SCRIPT_DIR/gamelists"
SYSTEM_NAME="$1"
URL_LIST="$SCRIPT_DIR/${SYSTEM_NAME}.url"
COOKIE_FILE="$SCRIPT_DIR/cookie.txt"

#process system html to get game url list
echo "Processing $SYSTEM_NAME."
grep -E "Game/[0-9]+" -Eo "$1" | sort -u | sed 's,Game/,https://retroachievements.org/linkedhashes.php?g=,' "$URL_LIST"
echo "Found $(wc -l < "$URL_LIST") games."

#create system folder for webpages with hashes
if test -d "./${GAME_LIST_DIR}/$SYSTEM_NAME"; then
    rm -rdf "./${GAME_LIST_DIR}/$SYSTEM_NAME"
    echo "Deleting ${GAME_LIST_DIR}/$SYSTEM_NAME folder."
fi
if ! test -d "./${GAME_LIST_DIR}/$SYSTEM_NAME"; then
    mkdir -p "./${GAME_LIST_DIR}/$SYSTEM_NAME"
    echo "Create ${GAME_LIST_DIR}/$SYSTEM_NAME folder."
fi

#download webpages with hashes form url list
echo "Downloading game info ..."
wget --random-wait --no-verbose --load-COOKIE_FILEs "${COOKIE_FILE}" -i "${URL_LIST}" -P "./${GAME_LIST_DIR}/${SYSTEM_NAME}"

#remove tempfiles
if test -f "$URL_LIST"; then
    rm "$URL_LIST"
fi