#!/usr/bin/env bash

empty() {
	[[ $(stat -c %s "$1") -eq 0 ]]
}

url2murl() {
	local x
	x=$1
	x=${x//'^'/'^5E'}
	x=${x//':'/'^3A'}
	x=${x//'%'/'^25'}
	printf '%s' "$x"
}

murl2url() {
	local x
	x=$1
	x=${x//'^25'/'%'}
	x=${x//'^3A'/':'}
	x=${x//'^5E'/'^'}
	printf '%s' "$x"
}

main() {
	set -euE -o pipefail
	top=$PWD

	mkdir -p "$1"
	cd "$1"
	git init
	echo 'ref: refs/heads/PROGRAMS/CVTUTF' > .git/HEAD
	git commit --allow-empty -m 'initial commit'

	while read -r time url; do
		suffix="${url##*/Public/}"
		dirpart="${suffix%/*}"
		filepart="${suffix##*/}"

		branch=$dirpart

		git checkout PROGRAMS/CVTUTF
		git checkout -b "$branch" || true
		git checkout "$branch"

		if [[ -n "$filepart" ]]; then
			file="$top/dat/content-file/$time/$(url2murl "$url")"
			cp "$file" .
		else
			dir="$top/dat/content-dir/$time/$(url2murl "$url")"
			comm -23 \
			    <(git ls-files) \
			    <(< "$dir/metadata.txt" awk '{print $1}') \
			    | xargs -r0 rm -f --
			if ! empty "$dir/readme.txt"; then
			   cp "$dir/readme.txt" .
			fi
			cp "$dir/metadata.txt" .metadata.txt
		fi

		if [[ -n "$(git status -s .)" ]]; then
			gitdate="$(sed -r 's/(....)(..)(..)(..)(..)(..)/\1-\2-\3T\4:\5:\6/' <<<"$time")"
			git add .
			export GIT_AUTHOR_DATE=$gitdate
			export GIT_COMMITTER_DATE=$gitdate
			git commit -m "$time $url"
		fi
	done
}

main "$@"