#!/bin/bash

set -eE -o pipefail
shopt -s extglob globstar nullglob
source "$(librelib messages)"
setup_traps

# usage: fetch_dbs <from> <into>
fetch_dbs() {
	rsync --no-motd -mrtLH --no-p \
		--include="*/" \
		--include="*.db" \
		--exclude="*" \
		--delete-after \
		"$1" "$2"
}

list_found() {
	local ret=0
	local dbfile repo re arch tag
	while read -r -d '' dbfile; do
		repo=${dbfile##*/}
		repo=${repo%.db}
		re=$(repo=$repo arch='(.*)' envsubst '$repo $arch' <<<"$ARCHPATH")
		arch=$(sed -rn "s,^$re\$,\1,p" <<<"${dbfile%/*}")
		if [[ -z $arch ]]; then
			error 'Could not figure out architecture for %q' "$dbfile"
			ret=1
			continue
		fi
		printf '%s\n' "$repo-$arch"
	done < <(find "$WORKDIR" -name '*.db' -printf '%P\0') | sort -u
	return $ret
}

list_configured() {
	printf '%s\n' "${ARCHTAGS[@]}" | sort -u
}

main() {
	if [[ $# -ne 0 ]] || [[ -z "$DBSCRIPTS_CONFIG" ]] || ! grep -q ARCHMIRROR -- "$DBSCRIPTS_CONFIG"; then
		msg 'usage: DBSCRIPTS_CONFIG=/path/to/file %s' "${0##*/}"
		exit $EXIT_INVALIDARGUMENT
	fi

	local config_file
	config_file="$(dirname "$(readlink -e "$0")")/config"
	source "$config_file"

	WORKDIR=$(mktemp -dt "${0##*/}.XXXXXXXXXX")
	readonly WORKDIR
	trap "rm -rf -- ${WORKDIR@Q}" EXIT

	fetch_dbs "${ARCHMIRROR}/" "$WORKDIR"

	y="${GREEN}✓${ALL_OFF}"
	n="${RED}✗${ALL_OFF}"
	while IFS='' read -r line; do
		case "$line" in
			$'\t\t'*)
				rmt=$y
				cfg=$y
				val=${line#$'\t\t'}
				;;
			$'\t'*)
				rmt=$n
				cfg=$y
				val=${line#$'\t'}
				;;
			*)
				rmt=$y
				cfg=$n
				val=$line
				;;
		esac
		printf '%s:%s:%s\n' "$val" "$rmt" "$cfg"
	done < <(comm <(list_found) <(list_configured)) | column -t -s:
}

main "$@"