#!/bin/bash
# Creates metadata for a show
# Kaotisk Hund 2024
#
# Output should be:
# {
#   "artist":...,
#   "title":...,
#   "duration":...,
#   "published_on":...,
#   "created_on":...,
#   "hash":...,
#   "mimetype":...,
#   "filename":...,
#   "file-extension":...
# }
#
# Accept one argument, the targeted file
if [ ! -z $1 ] && [ -n "$1" ]
then
    filename="$1"
else
    echo "No filename given"
    exit 1
fi
# Check if file exists
if [ ! -f "${filename}" ]
then
    echo "File doesn't exist"
    exit 1
fi
# ❯ file QmNcDk7jn8pGtt3UWZnKDPSGmGwFNkBUyXHCD5H9bdZ2Le.ogx
# QmNcDk7jn8pGtt3UWZnKDPSGmGwFNkBUyXHCD5H9bdZ2Le.ogx: Ogg data, Vorbis audio, stereo, 44100 Hz, ~192000 bps, created by: Xiph.Org libVorbis I
# 
file ${filename} | grep 'Ogg data, Vorbis audio,' 1>/dev/null 2>&1
if [ $? -eq 0 ]
then
    mimetype='audio/ogg'
else
    echo "Unknown file type"
    exit 1
fi
hashstring="$(sha512sum ${filename}|cut -d ' ' -f 1)"
if [ -f "./hashes/${hashstring}" ]
then
    echo "File already exists"
    exit 1
fi

artist="$(ogginfo ${filename} | grep -i ARTIST | cut -d '=' -f 2-)"
title="$(ogginfo ${filename} | grep -i TITLE | cut -d '=' -f 2-)"
duration="$(ogginfo ${filename} | grep 'Playback length' | cut -d ':' -f 2-)"
published_on="$(date -u +%s)000"
dmins="$(echo ${duration}|cut -d 'm' -f 1)"
dsecs="$(echo ${duration}|cut -d ':' -f 2|cut -d '.' -f 1)"
dmil="$(echo ${duration}|cut -d ':' -f 2|cut -d '.' -f 2|cut -d 's' -f 1)"
duration="$(echo -n $(($(( ${dmins} * 60)) + ${dsecs}))${dmil})"
created_on="$(echo -n $((${published_on} - ${duration})))"
file_extension="$(echo -n $filename|rev|cut -d '.' -f 1|rev)"

temp_file="$(mktemp)"

(
cat >&1 <<EOF
{
    "type":"show",
    "artist":"${artist}",
    "title":"${title}",
    "published_on":"${published_on}",
    "created_on":"${created_on}",
    "duration":"${duration}",
    "hash":"${hashstring}",
    "mimetype":"${mimetype}",
    "file_extension":"${file_extension}",
    "filename":"${filename}"
}
EOF
)| jq -c -M >  ${temp_file}
show_hash="$(sha512sum ${temp_file} | cut -d ' ' -f 1)"

cp ${filename} ./hashes/${hashstring}
mv ${temp_file} ./hashes/${show_hash}