#!/bin/bash

THIS_SCRIPT_NAME="$(basename ${BASH_SOURCE[0]})"

function pass() {
    :
}

function print_log() {
    printf "[$THIS_SCRIPT_NAME][$(date --iso-8601=ns)] $1\n"
}

function log_error() {
    print_log "error: $1" >&2

    if [[ $2 =~ ^[0-9]+$ ]]
    then
        exit $2
    fi
}

function print_space_indent() {
    # note: indent_depth has script-wide scope
    printf "%*s" ${1:-$indent_depth}
}

function print_tab_indent() {
    printf "\t"
}

function indent() {
    local indent_count=$([[ $1 =~ ^[0-9]+$ ]] && [[ $1 > 0 ]] && echo $1 || echo 1)
    # note: indent_type has script-wide scope
    local cmd_print_indent=$([[ $indent_type == s ]] && echo print_space_indent || echo print_tab_indent)

    $cmd_log "indent_count=[$indent_count]"

    for ((i=0; i<$indent_count; i++))
    do
        $cmd_print_indent $2
    done
}

# set option defaults before processing options
cmd_log=print_log
pm_perfix="\$anvil"
indent_type=s
# number of spaces per indent; only when indent_type is space
indent_depth=4
# match subprocesses to skip; skip new, parent, and private subprocesses by default
ignore_sub_name_pattern="^(new|parent|_[^[:space:]]+)$"

while getopts ":i:no:p:" option
do
    case "$option" in
        i)
            if [[ $OPTARG =~ ^[0-9]+$ ]] && [[ $OPTARG > 0 ]]
            then
                indent_depth=$OPTARG
            elif [[ $OPTARG == t ]]
            then
                indent_type=t
            fi
            ;;
        n)
            cmd_log=pass
            ;;
        o)
            pm_perfix="$OPTARG"
            ;;
        p)
            ignore_sub_name_pattern="$OPTARG"
            ;;
        :)
            log_error "option [$OPTARG] missing argument" 1
            ;;
        [?])
            log_error "unrecognized option [$OPTARG]" 1
            ;;
    esac
done

shift $(($OPTIND - 1))

# get positional parameters after processing options
pm_path="$1"

$cmd_log "pm_path=[$pm_path]"
$cmd_log "pm_perfix=[$pm_perfix]"
$cmd_log "indent_depth=[$indent_depth]"
$cmd_log "ignore_sub_name_pattern=[$ignore_sub_name_pattern]"

pm_name="$( \
    sed -E -n "s@^[[:space:]]*package[[:space:]]+([^[:space:]]+::)+([^[:space:]]+);.*\$@\2@p" "$pm_path" \
)"

$cmd_log "pm_name=[$pm_name]"

pm_dispatch_table="my \$pm_${pm_name,,}_dispatch_table = {";

for sub_name in $(sed -E -n "s@^[[:space:]]*sub[[:space:]]+([^[:space:]]+).*\$@\1@p" "$pm_path")
do
    if ! [[ "$sub_name" =~ $ignore_sub_name_pattern ]]
    then
        cat << EOF
sub ${sub_name}
{
$(indent)my \$parameters = shift;
$(indent)${pm_perfix}->${pm_name}->${sub_name}(\$parameters);
}

EOF

        pm_dispatch_table="${pm_dispatch_table}\n$(indent)'${sub_name}' => \&${sub_name},"
    else
        $cmd_log "subprocess [$sub_name] skipped"
    fi
done

printf "${pm_dispatch_table%,}\n};\n"