#!/usr/bin/env bash

shopt -s nullglob

# I have I feeling I will hate this script by the time I finish writing it

# Some cursed JSON header
echo '{'
echo '"videos":['

isfirst="1"

for filename in *.mp4; do
    if [ -f "$filename" ]; then
        if [ $isfirst -ne "1" ]; then
            echo ','
        fi
        isfirst="0"
        name="${filename%.mp4}"
        echo '{'
        echo '"filename":"'"$filename"'",'
        echo '"subtitles":['
        sub_isfirst="1"
        IFS=$'\n'
        for subtitleName in "$name".*.vtt; do
            if [ $sub_isfirst -ne 1 ]; then
                echo ','
            fi
            echo '"'$subtitleName'"'
            sub_isfirst="0"
        done
        echo '],'
        ffmpeg -n -ss 00:00:01.00 -i "$filename" -vf 'scale=320:320:force_original_aspect_ratio=decrease' -vframes 1 "$name.jpg"
        echo '"thumbnail":"'"$name"'.jpg",'
        dimensions=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 "$filename")
        echo '"dimensions":"'"$dimensions"'",'
        duration=$(ffprobe -v error -sexagesimal -select_streams v:0 -show_entries stream=duration -of default=noprint_wrappers=1:nokey=1 "$filename")
        echo '"duration":"'"$duration"'"'
        echo '}'
    fi
done

# Close everything off :)
echo ']'
echo '}'