#!/usr/bin/env bash
# Copyright 2014 Vladimir Ivanov <ivvl82@gmail.com>
# Distributed under the terms of the GNU General Public License v2

REPODIR="`dirname $0`"
TOURNAMENT="2014/2-summertime"

# Config file for players
ply_ini="${REPODIR}/${TOURNAMENT}/players.ini"

get_game_players() {
    # Extract players on Lichess
    local w_lichess=$(sed -En "s/\[White \"([^\"]*)\"\]/\1/p" < "$tmp_pgn")
    local b_lichess=$(sed -En "s/\[Black \"([^\"]*)\"\]/\1/p" < "$tmp_pgn")

    # Get names of white and black players
    local counter=1 players=()
    parse_config
    while eval "config_section_player${counter}" 2>/dev/null; do
        players+=("$name")
        [[ "$lichess" == "$w_lichess" ]] && white="$name"
        [[ "$lichess" == "$b_lichess" ]] && black="$name"
        counter=$((counter+1))
    done
    [[ -z "$white" ]] && fix_white_player
    [[ -z "$black" ]] && fix_black_player
}

parse_config() {
    # Copy player INI file to the temporary location
    # NOTE: an empty line is added to the file beginning in order to
    # match the only first occurrence for non-GNU sed
    echo > "$tmp_ini"
    cat "$ply_ini" >> "$tmp_ini"

    # Remove tabs or spaces around the `='
    sed -i".prev" -E "s/[[:blank:]]*=[[:blank:]]*/=/g" "$tmp_ini"

    # Transform section labels into function declaration
    sed -i".prev" -E "1,/^\[.*\]/s/^\[([^]]*)\]/config_section_\1() {/g" "$tmp_ini"
    sed -i".prev" -E "s/^\[([^]]*)\]/}\\"$'\n'"config_section_\1() {/g" "$tmp_ini"
    echo -e "\n}" >> "$tmp_ini"

    # Load the file
    source "$tmp_ini"
}

fix_white_player() {
    local number
    echo "Lichess player '${w_lichess}' not found."
    choose_player
    white="${players[$number]}"
}

fix_black_player() {
    local number
    echo "Lichess player '${b_lichess}' not found."
    choose_player
    black="${players[$number]}"
}

choose_player() {
    local answer
    echo -n "Would you like to choose a name? (Y/n)> "
    read answer
    [[ "$answer" =~ ^(Y|y|Yes|yes)$ ]] || exit 1

    for ((i=0; i<${#players[@]}; ++i)); do
        echo "$((i+1)) ${players[$i]}"
    done \
        | column -t \
        | sed -E "s/^([0-9]*)/$(tput setaf 6)\1$(tput sgr0)/g" # highlight number
    echo -n "Put number> "
    read number

    if (( "$number" < 1 || "$number" > ${#players[@]} )); then
        die "Incorrect player number."
    fi
    number=$((number-1))
}

die() {
    echo "$@" 1>&2
    exit 1
}

checkargs() {
    if [[ "$opt" == t && ! "$OPTARG" =~ ^[0-9]+$ ]]; then
        echo "Incorrect tour number" 1>&2
        exit 1
    fi
}

TOUR=""

while getopts "t:hv" opt; do
    case "$opt" in
        t)  checkargs
            TOUR=$(printf "%02g" "$OPTARG")
            ;;
        h)  usage && exit 0
            ;;
        v)  version && exit 0
            ;;
    esac
done

shift $(($OPTIND - 1))

# For now, tour number should be given explicitly
[[ -z "$TOUR" ]] && die "Tour number not specified."

# Temporary files
tmp_ini=$(mktemp -t `basename $ply_ini`.XXXXXX)
tmp_pgn=$(mktemp -t pgn.XXXXXX)
trap "rm ${tmp_ini} ${tmp_ini}.prev ${tmp_pgn}" EXIT

# Download PGN file
[[ "$1" =~ ^(http://[^/]*)/([^/]*) ]]
pgn_url="${BASH_REMATCH[1]}/${BASH_REMATCH[2]:0:8}/pgn"
curl -q --fail --location --silent "$pgn_url" > "$tmp_pgn" \
    || die "PGN file not found."

white="" black=""
get_game_players

# Extract the game date
date=$(sed -En "s/\[Date \"([^\"]*)\"\]/\1/p" < "$tmp_pgn")
date=$(tr '.' '-' <<< "$date")

pgn_dir="${REPODIR}/${TOURNAMENT}/tours/${TOUR}/${date}-${white}-vs-${black}"
[[ -d "$pgn_dir" ]] && die "Directory ${pgn_dir} already exist."

echo "Creating directory ${pgn_dir}..."
mkdir -p "$pgn_dir"
echo "Storing PGN file..."
cp "$tmp_pgn" "${pgn_dir}/1.pgn"

exit 0