#!/usr/bin/env bash
#
# Before running this script make sure that Flathub repo is added:
#
# flatpak remote-add --user --if-not-exists \
#     flathub https://flathub.org/repo/flathub.flatpakrepo
#
# and appstream info is updated:
#
# flatpak update --appstream flathub

set -euo pipefail

IFS=$'\n\t'
SCRIPT_DIR="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
GIT_ROOT="$SCRIPT_DIR/.."

XDG_DATA_DIRS="${XDG_DATA_DIRS:-/usr/local/share/:/usr/share/}"

IGNORED_APPS=(
	# apps without icons:
	com.github.nihui.waifu2x-ncnn-vulkan
	com.riverbankcomputing.PyQt.BaseApp
	dev.paullee.scraterpreter.Scrape
	dev.paullee.scraterpreter.Scrapec
	io.atom.electron.BaseApp
	io.elementary.BaseApp
	io.elementary.Loki.BaseApp
	io.github.erkin.ponysay
	io.gitlab.sdl_jstest.sdl2_jstest
	io.gitlab.sdl_jstest.sdl_jstest
	io.liri.BaseApp
	io.qt.qtwebengine.BaseApp
	io.qt.qtwebkit.BaseApp
	net.sourceforge.fspclient
	org.chromium.Chromium.BaseApp
	org.electronjs.Electron2.BaseApp
	org.flathub.flatpak-external-data-checker
	org.flatpak.Builder
	org.flatpak.flat-manager-client
	org.freedesktop.appstream.cli
	org.freedesktop.appstream-glib
	org.freedesktop.GlxInfo
	org.freedesktop.LinuxAudio.BaseExtension
	org.freedesktop.Platform.ClInfo
	org.freedesktop.Platform.GlxInfo
	org.freedesktop.Platform.VaInfo
	org.freedesktop.Platform.VulkanInfo
	org.genivi.DLTViewer
	org.godotengine.godot.BaseApp
	org.gnome.NautilusPreviewer
	org.mosh.mosh
	org.mozilla.firefox.BaseApp
	org.nuspell.Nuspell
	org.sugarlabs.BaseApp
	radio.k0swe.Kel_Agent
	se.emijoh.mpw
	# apps with icons that do not match with App ID:
	cat.xtec.clic.JClic  # cat.xtec.clic.JClic.{jclic,jclicauthor}
	com.wps.Office  # com.wps.Office.{etmain,pdfmain,kprometheus,wppmain,wpsmain}
	org.freeorion.FreeOrion  # freeorion
	org.homelinuxserver.vance.biblereader  # org.homelinuxserver.vance.biblereader-symbolic
	org.kde.kcolorchooser  # kcolorchooser
	org.kde.kdiff3  # kdiff3
	org.libreoffice.LibreOffice  # org.libreoffice.LibreOffice.{base,calc,draw,impress,math,startcenter,writer}
	# ignore apps from Sugar Labs®
	org.sugarlabs.AbacusActivity
	org.sugarlabs.Chart
	org.sugarlabs.Chess
	org.sugarlabs.ColorDeducto
	org.sugarlabs.Dimensions
	org.sugarlabs.Finance
	org.sugarlabs.FotoToon
	org.sugarlabs.FractionBounce
	org.sugarlabs.ImplodeActivity
	org.sugarlabs.Maze
	org.sugarlabs.Measure
	org.sugarlabs.Memorize
	org.sugarlabs.MusicBlocks
	org.sugarlabs.MusicKeyboard
	org.sugarlabs.Paint
	org.sugarlabs.Physics
	org.sugarlabs.Pippy
	org.sugarlabs.Pukllanapac
	org.sugarlabs.ReadETexts
	org.sugarlabs.Sliderule
	org.sugarlabs.SolarSystem
	org.sugarlabs.Speak
	org.sugarlabs.StoryActivity
	org.sugarlabs.SwiftFeet
	org.sugarlabs.TurtlePondActivity
	org.sugarlabs.Words
)

flathub_apps_list="$(mktemp -u)"
papirus_icons_list="$(mktemp -u)"

_cleanup() {
	rm -f "$flathub_apps_list" "$papirus_icons_list"
}

trap _cleanup EXIT HUP INT TERM

env XDG_DATA_DIRS="$HOME/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:$XDG_DATA_DIRS" \
	flatpak remote-ls --app --columns app flathub | sort -u > "$flathub_apps_list"
git -C "$GIT_ROOT" ls-tree master:Papirus/64x64/apps --name-only |
	sed 's/\.svg$//' | sort > "$papirus_icons_list"

while read -r app_id; do
	[[ "${IGNORED_APPS[*]//$app_id/}" == "${IGNORED_APPS[*]}" ]] || continue
	if [ -n "${MARKDOWN:-}" ]; then
		# shellcheck disable=SC2016
		printf ' - [ ] `%s` <kbd>[GitHub](%s)</kbd> <kbd>[Flathub](%s)</kbd>\n' \
			"$app_id" "https://github.com/flathub/$app_id" "https://flathub.org/apps/details/$app_id"
	else
		printf '%s\n' "$app_id"
	fi
done < <(comm -23 "$flathub_apps_list" "$papirus_icons_list")