#!/usr/bin/env bash

function help() {
cat << HELP
Simply creates an output from an openring template.

Usage: [options] [input_file]

Options:
  -h, --help    Help.
  -l, --limit   The number of posts to be shown.
  -d, --data    The file path of a JSON file containing an
                array of URLs (as strings).
  -o, --output  The output file path.
                If there's no output value given, the resulting
                output name will be '\$INPUT.out'.
  -i, --input   The input file path.
HELP
}

# The default values.
LIMIT=5

INPUT_TEMPLATE="./assets/templates/openring-input.html"
input_file=$(basename "$INPUT_TEMPLATE")
input_file_ext="${input_file##*.}"
input_file="${input_file%.*}"

OUTPUT="$input_file.out.$input_file_ext"
DATA="data/blogs.json"

while [[ "$#" -gt 0 ]]; do
    case "$1" in
        -h|--help)
            help
            exit 0
            ;;
        -l|--limit)
            LIMIT="$2"
            shift
            shift
            ;;
        -d|--data)
            DATA="$2"
            shift
            shift
            ;;
        -o|--output)
            OUTPUT="$2"
            shift
            shift
            ;;
        -i|--input)
            INPUT_TEMPLATE="$2"
            shift
            shift
            ;;
        *)
            INPUT_TEMPLATE="$1"
            shift
            ;;
    esac
done

# Checks whether it is locally compiled or not.
if [[ -a ./openring ]]; then
    OPENRING="./openring/openring";
else
    OPENRING="openring";
fi

for feed in $(jq ".[]" "$DATA" | shuf --head-count $LIMIT); do
    OPENRING="$OPENRING -s $feed";
done

OPENRING="$OPENRING -n $LIMIT < $INPUT_TEMPLATE > $OUTPUT"

echo "$OPENRING"
eval $OPENRING