#!/bin/bash

# Simple chat bot
# with sending images to an external programme.

random() {
    if (( "$1" < 1 )); then
        echo '1'
    else
        shuf -n1 -i "1-$1"
    fi
}

cd "$(dirname "$0")"

printf "%s" "$1: "
from=$(printf "%s\n" "$1" | tr -d '$`|<>')

# Second argument shows whether user is an admin (useless).
shift 2
string=$(echo "$@" | tr -d '$`')
if [[ ${#string} -gt 750 ]]; then
    echo "tl;dr"
    exit 0
fi

if [[ "$string" == *http*://* ]]; then
    amount=$(sed -e '/https*:\/\//!d' ./frs.txt | wc -l)
    # Makes it a bit more human (time to find a link?).
    sleep 1
    sed -e '/https*:\/\//!d' ./frs.txt | sed -n "$(random "$amount")p"
    img="$(printf "%s\n" "$string" | sed -ne 's|.*\(https*://[^ \"()<>]*\).*|\1|g;1p')"
    ns="$(printf "%s\n" "$string" | sed -e "s|$img||g")"
    cl="$(wget --spider -S "$img" 2>&1)"
    if [[ $(printf "%s\n" "$cl" | sed -e '/Content-Type/!d;/image\//!d') ]]; then
        #echo 'posting'
        printf "%s\n" "$img $from" >> ./pictures.txt
    fi
else
    # Exclude last two entries from the amount.
    amount="$(($(sed -e '/https*:\/\//d' ./frs.txt | wc -l) - 2))"
    answer="$(sed -e '/https*:\/\//d' ./frs.txt | sed -ne "s/;;\\\n/\n/g;$(random "$amount")p")"
    # Makes it a bit more human.
    sleep "$(echo "${#answer} * 0.15" | bc -l)"
    printf "%s\n" "$answer"
fi
if [[ ${#string} -lt 7 ]]; then
    exit 0
fi
printf "%s\n" "$string" | sed -e '{:q;N;s/\n/;;\\n/g;t q}' >> ./frs.txt
exit 0