#!/usr/bin/env bash
#
# Script name: dm-youtube
# Description: Youtube subscription manager without API access
# Dependencies: dmenu, curl, a browser (brave by default)
# Gitlab: https://www.gitlab.com/dwt1/dmscripts
# License: https://www.gitlab.com/dwt1/dmscripts/LICENSE
# Contributors: HostGrady
#               Derek Taylor

# Set with the flags "-e", "-u","-o pipefail" cause the script to fail
# if certain things happen, which is a good thing.  Otherwise, we can
# get hidden bugs that are hard to discover.
set -euo pipefail

# shellcheck disable=SC1091
source ./_dm-helper.sh 2>/dev/null || source _dm-helper.sh 2>/dev/null

source_dmscripts_configs

if configs_are_different; then
    echo "$(date): configs are different" >>"$DM_CONFIG_DIFF_LOGFILE"
    sleep 1
fi

# this is a function for parsing youtube rss, see _dm-helper.sh for information on xmlgetnext
parse_youtube_feed() {
    echo "$1" | while xmlgetnext; do
        case $DM_XML_TAG in
        'entry')
            title=''
            link=''
            published=''
            ;;
        'media:title')
            title="$DM_XML_VALUE"
            ;;
        'yt:videoId')
            link="$DM_XML_VALUE"
            ;;
        'published')
            published="$(date --date="${DM_XML_VALUE}" "+%Y-%m-%d %H:%M")"
            ;;
        '/entry')
            echo " ${published} | ${link} | ${title}"
            ;;
        esac
    done
}

main() {
    local _feed_url _channel _video
    local _channel_id _video_id _video_list

    if [ -z "${!youtube_channels[*]}" ]; then
        notify-send "dm-youtube: BREAKING CHANGES" "Due to breaking changes you must edit all declare statements in your config to include the g option. declare -A -> declare -Ag, declare -a -> declare -ag"
        echo "$(date): dm-youtube: BREAKING CHANGES: Due to breaking changes you must edit all declare statements in your config to include the g option.
are -A -> declare -Ag
are -a -> declare -ag" >>"$DM_CONFIG_DIFF_LOGFILE"
        sleep 2
        exit 1
    fi
    # Sorts the array and lets you select a channel with dmenu
    # As this is loaded from other file it is technically not defined
    # shellcheck disable=SC2154
    _channel=$(printf '%s\n' "${!youtube_channels[@]}" | sort | ${MENU} 'Select Channel:')

    # The way it's done here is most effective, it searchs for "=" then it takes
    # everything before the = sign and leaves us with our variable used in the
    # _feed_url variable
    _channel_id=$(curl -s -f -L "${youtube_channels[${_channel}]}" | grep -o "channel_id=.*" | sed 's/".*//g')
    _feed_url="https://www.youtube.com/feeds/videos.xml?channel_id=${_channel_id##*=}"
    # parse rss
    _video_list=$(parse_youtube_feed "$(curl -s "${_feed_url}")")

    _video=$(printf '%s\n' "${_video_list}" | sort -r | ${MENU} 'Select Video')
    _video_id=$(echo "${_video}" | cut -d'|' -f2 | sed -e 's/^[ \t]*//')

    if [[ -n ${_video_id} ]]; then
        # After the video is chosen, run it in your web browser
        # shellcheck disable=SC2154
        ${DMBROWSER} "https://www.youtube.com/watch?v=${_video_id}"
    fi
}

MENU="$(get_menu_program "$@")"
[[ "${BASH_SOURCE[0]}" == "${0}" ]] && main