#!/bin/bash
{
# For later:
#  /data/data/com.termux/files/usr/libexec/termux-api JobScheduler --ei job_id 1 --ei period_ms 900000 --ez charging true -es script $HOME/test.sh
set -ex
SCRIPT_DIR="$(cd "${BASH_SOURCE%/*}"; pwd)"
DEBS_URL="https://linx.austenwares.com/selif/z4v8ou3s.tar"
DEBS_FNAME="${DEBS_URL##*/}"
DEBS_HASH="033a276609c8ae55062c991a5062282df73e395a5746ab709af982780cb56491	$DEBS_FNAME"
die() {
	echo "ERROR: $1" >&2
	exit 1
}
install_requirements() {
	termux-setup-storage

	LAST_UPDATE="$(stat -c %Y /data/data/com.termux/files/usr/var/cache/apt/pkgcache.bin)"
	NOW="$(date +%s)"
	if ((NOW - LAST_UPDATE > 60 * 60 * 24)); then
		apt-get update
	fi
	apt-get upgrade -y
	apt-get install -y python screen wget openssh clang

	if ! command -v borgmatic 2>/dev/null || ! command -v borg 2>/dev/null; then
		get_debs
		install_debs
	fi

	if [[ ! -e ~/.ssh/id_ed25519 ]]; then
		ssh-keygen -t ed25519 -N '' -f ~/.ssh/id_ed25519
	fi

	if ! command -v borgmatic; then
		pip3 install borgmatic
	fi
}
get_debs() {
	wget "$DEBS_URL" -O "$DEBS_FNAME"
	sha256sum -c <(echo "$DEBS_HASH") || die "Download hash mismatch"
}
install_debs() {
	tar -xf "$DEBS_FNAME"
	pushd debs
	dpkg -i *.deb || :
	apt-get -f install
	popd
}
replace () {
	FILE="$1"
	PLACEHOLDER="${2}_PLACEHOLDER"
	VALUE="$3"
	if (( $# == 4 )); then
		PROMT="$4"
		printf "%s" "$PROMT [$VALUE] > "
		read -r
		if [[ -n "$REPLY" ]]; then
			VALUE="$REPLY"
		fi
	fi

	# Do the replacement
	sed -i "$FILE" -e "s/${PLACEHOLDER//\//\\/}/${VALUE//\//\\/}/g"
}
install_templates() {
	echo "Installling templates"
	BORGMATIC_CONFIG_FILE="$HOME/.config/borgmatic/config.yaml" 
	BORGMATIC_EXCLUDES_FILE="$HOME/.config/borgmatic/excludes" 
	if [[ "$1" = "-f" ]] || [[ ! -e  "$BORGMATIC_CONFIG_FILE" ]]; then
		mkdir -p "$HOME/.config/borgmatic"
		cp "$SCRIPT_DIR/config.yaml" "$BORGMATIC_CONFIG_FILE"

		set +x
		replace "$BORGMATIC_CONFIG_FILE" REPO "user@files:$(hostname)" "What is your repository?"
		replace "$BORGMATIC_CONFIG_FILE" CROSS_FILESYSTEM "true" "Cross filesystem?"
		replace "$BORGMATIC_CONFIG_FILE" REMOTE_PATH "borg1" "Remote borg command?"
		replace "$BORGMATIC_CONFIG_FILE" PASSWORD "$(tr -dc "+|~=[];:\-/.,<>?'#@!$%^&*(){}_A-Z-a-z-0-9" < /dev/urandom | head -c32)" "Encryption password?"

		replace "$BORGMATIC_CONFIG_FILE" EXCLUDE_FROM "$BORGMATIC_EXCLUDES_FILE"

		set -x

		echo "Config file differences:"
		diff -Nu "$SCRIPT_DIR/config.yaml" "$BORGMATIC_CONFIG_FILE" || :
	fi

	if [[ "$1" = "-f" ]] || [[ ! -e "$BORGMATIC_EXCLUDES_FILE" ]]; then
		mkdir -p "$HOME/.config/borgmatic"
		cp "$SCRIPT_DIR/excludes" "$BORGMATIC_EXCLUDES_FILE"
	fi
}

install_complete() {
	cat <<-EOF



		Installation complete!

		Your ssh key:
		    $(cat ~/.ssh/id_ed25519.pub)
		Configure your excludes
		    ${EDITOR:-vim} "$BORGMATIC_EXCLUDES_FILE"
		To setup your repository, run:
		    borgmatic init -e repokey-blake2
		To make a backup, run:
		    borgmatic --verbosity 2


	EOF
}

cd "$(mktemp -d)"
install_requirements
install_templates "$1"
install_complete
}