#!/bin/bash

tools_dir=$(dirname "$0")
# shellcheck source=/dev/null
. "$tools_dir/common.sh" ''

if [ "$1" = '-n' ]; then
	shift
	last=$(tail -n1 "$SHA1_FILE" | cut -f1 -d$'\t')
	start_from=$(awk -F '\t' '/^[^#]/ && $3 == "'"$last"'" {
		do
			getline;
		while (/^#/ || $2 == "branch");
		print $3;
		exit 0;
	}' "$CTRL_FILE")
fi

if [ "$1" = '-s' ]; then
	shift
	start_from="$1"
	if [ -z "$start_from" ]; then
		printf '-s requires a start tree\n' 1>&2
		exit 1
	fi
	shift
fi

get_field()
{
	awk -F '\t' '/^[^#]/ && $3 == "'"$1"'" { print $'"$2"'; }' "$CTRL_FILE"
}

fetch_git()
{
	git fetch "$1"
}

fetch_mmotm()
{
	(
		if ! cd ../mmotm; then
			printf 'Cannot chdir to ../mmotm\n' 1>&2
			return
		fi
		if ! rsync -az --partial --exclude '.git*' \
				--exclude broken-out.tar.gz --delete \
				ozlabs.org::akpm/mmotm/. .; then
			git reset --hard
			printf 'Fetcing mmotm failed\n' 1>&2
			return
		fi
		git add -A .
		if [ "$(git status --porcelain)" ]; then
			git commit -m "$(head -n 1 .DATE)"
		fi
	)
}

fetch_quilt()
{
	(
		url=$(get_field "$1" 4)
		url=${url%/}	# strip trailing / if necessary

		if ! cd ../quilt; then
			printf 'Cannot chdir to ../quilt\n' 1>&2
			return
		fi
		if ! [ -d "$1" ] && ! mkdir "$1"; then
			printf 'Cannot create quilt directory for %s\n' "$1" 1>&2
			return
		fi
		if ! cd "$1"; then
			printf 'Cannot chdir to quilt directory for %s\n' "$1" 1>&2
			return
		fi
		if ! wget -N -nv --no-cache --no-xattr "$url/series"; then
			printf 'Wget of %s series file failed\n' "$1" 1>&2
			cd ..
			rm -rf "$1"
			git checkout "$1"
			return
		fi
		find . -type f | sed 's,^./,,;/^series$/d' | sort >.series.old
		if grep -q NEXT_PATCHES series; then
			sed -n '/NEXT_PATCHES_START/,/NEXT_PATCHES_END/p' series
		else
			cat series
		fi |
			sed -e 's/[ \t]*#.*$//' -e '/^[ \t]*$/d' |
			sort >.series.next
		if [ -s .series.next ]; then
			if ! wget -N -nv --no-cache --no-xattr -B "$url/" -i .series.next; then
				printf 'Wget of series %s failed\n' "$1" 1>&2
				cd ..
				rm -rf "$1"
				git checkout "$1"
				return
			fi
		fi
		comm -23 .series.old .series.next | xargs -r rm -f
		rm -f .series.old .series.next
	)
}

trees="$*"
if ! [ "$trees" ]; then
	trees=$(awk -F '\t' '/^[^#]/ && $2 != "branch" { print $3 }' "$CTRL_FILE")
fi

for name in $trees; do
	if [ -n "$start_from" ]; then
		if [ "$name" = "$start_from" ]; then
			start_from=''
		else
			continue
		fi
	fi

	type=$(get_field "$name" 2)
	if ! [ "$type" ]; then
		printf '%s: unknown tree\n' "$name" 1>&2
		continue
	fi

	printf '%s: %s\n' "$name" "$type"
	fun="fetch_$type"
	tfun=$(type -t "$fun")
	if [ "$tfun" = 'function' ]; then
		"$fun" "$name"
	fi
done

if ! cd ../quilt; then
	printf 'hmmm, what happened to the quilt directory?\n' 1>&2
	exit 1
fi
git add -A .
if [ "$(git status --porcelain)" ]; then
	git commit -v -a -m "$(date '+%F-%H:%M')" -e
fi

exit 0