#!/bin/bash

input_file=$1
output_file=$3
pattern=$2

if [ -z $input_file -o -z $pattern ]; then
    echo "input file: $input_file, pattern: $pattern"
    echo "Usage: $0 <./path/to/matrix-rooms.txt> <PATTERN> [./path/to/output.txt]"
    exit 0
fi

#echo "Converting matrix account data into a comprehensive room list ..."
if [ -z $output_file ]; then
    jq ".rooms.join | [to_entries[] | .value.state.events[] | select(.type == \"m.room.member\") | {\"user_id\": .sender, \"displayname\": .content.displayname}] | unique_by(.user_id) | map(select(.user_id | match(\"$pattern\")))" "$input_file"

else
    jq ".rooms.join | [to_entries[] | .value.state.events[] | select(.type == \"m.room.member\") | {\"user_id\": .sender, \"displayname\": .content.displayname}] | unique_by(.user_id) | map(select(.user_id | match(\"$pattern\")))" "$input_file" > "$output_file"
fi