#!/usr/bin/env sh
# POSIX sh
#-----------------
show_package_info() {
	get_uname
	set_extra_deps
	# Architecture: amd64, i386, arm64, armhf, mipsel, riscv64, ppc64el, s390x
	cat <<-EndOfShow
		Package: tmoe-linux-manager
		Version: 1.4988.3
		Priority: optional
		Section: admin
		Maintainer: 2moe <25324935+2moe@users.noreply.github.com>
		Depends: aria2 (>= 1.30.0), binutils (>= 2.28-5), coreutils (>= 8.26-3), curl (>= 7.52.1-5), findutils (>= 4.6.0), git (>= 1:2.11.0-3), grep, lsof (>= 4.89), micro (>= 2.0.6-2) | nano (>= 2.7.4-1), proot (>= 5.1.0), procps (>= 2:3.3.12), sed, sudo (>= 1.8.19p1-2.1), tar (>= 1.29b-1.1),  util-linux (>= 2.29.2-1), whiptail (>= 0.52.19), xz-utils (>= 5.2.2), zstd (>= 1.1.2)${EXTRA_DEPS}
		Recommends: bat, busybox, debootstrap, eatmydata, gzip, less, lz4, pulseaudio, pv, qemu-user-static, systemd-container
		Suggests: lolcat, zsh
		Homepage: https://github.com/2moe/linux
		Tag: interface::TODO, interface::text-mode, system::cloud, system::virtual, role::program, works-with::archive, works-with::software:package, works-with::text
		Description: Easily manage containers and system. Just type "tmoe" to enjoy it.
	EndOfShow
}
#-----------------
get_uname_o() {
	case "$(uname -o)" in
	Android) OS=android ;;
	illumos) OS=illum ;;
	esac
}

get_uname() {
	# todo: pub const OS :&'static str = "redox";
	case "$(uname -s)" in
	Darwin) OS=mac ;;
	*Linux | *linux)
		OS=linux
		get_uname_o
		;;
	SunOS)
		OS=sun
		get_uname_o
		;;
	FreeBSD) OS=freebsd ;;
	NetBSD) OS=netbsd ;;
	DragonFly) OS=dragonfly ;;
	MINGW* | MSYS* | CYGWIN*) OS=win ;;
	esac
}

set_extra_deps() {
	case $OS in
	android) EXTRA_DEPS=", dialog, termux-api, termux-tools" ;;
	esac
}
#-----------------
pln() {
	printf "%s\n" "$@"
}
#-----------------
set_colour() {
	RED="$(printf '\033[31m')"
	GREEN="$(printf '\033[32m')"
	YELLOW="$(printf '\033[33m')"
	BLUE="$(printf '\033[34m')"
	PURPLE="$(printf '\033[35m')"
	CYAN="$(printf '\033[36m')"
	RESET="$(printf '\033[m')"
	BOLD="$(printf '\033[1m')"
}

set_path_and_url() {
	TMOE_MANAGER="share/old-version/share/app/manager"
	TMOE_URL="https://gitee.com/mo2/linux/raw/master/${TMOE_MANAGER}"
	TMOE_URL_02="https://cdn.jsdelivr.net/gh/2moe/tmoe-linux@master/${TMOE_MANAGER}"
	TMOE_GIT_DIR="${HOME}/.local/share/tmoe-linux/git"
	TMOE_GIT_DIR_02="/usr/local/etc/tmoe-linux/git"
	TEMP_FILE=".tmoe-linux.sh"
}

set_tmp_dir() {
	if [ -z "${TMPDIR}" ]; then
		for i in /tmp "${HOME}"; do
			if [ -e "${i}" ]; then
				TMPDIR="${i}/.cache"
				mkdir -p "${TMPDIR}"
				break
			fi
		done
	fi
}

set_env() {
	set_colour
	set_path_and_url
	set_tmp_dir
	unset EXTRA_DEPS MANAGER_FILE
}
#-----------------
do_you_want_to_continue() {
	pln \
		"${YELLOW}Do you want to ${BLUE}continue?${PURPLE}[Y/n]${RESET}" \
		"Press ${GREEN}enter${RESET} to ${BLUE}continue${RESET}, type ${YELLOW}n${RESET} to ${PURPLE}exit${RESET}." \
		"按${GREEN}回车键${BLUE}继续${RESET}，输${YELLOW}n${PURPLE}退出${RESET}"

	case "$OS" in
	linux | android) ;;
	*)
		pln \
			"${RED}Unfortunately, ${GREEN}tmoe ${PURPLE}does not support ${CYAN}your ${BLUE}${OS} OS${YELLOW} at this time${RESET}." \
			"Please press ${GREEN}Ctrl + C${RESET} to ${RED}abort${RESET}"
		;;
	esac

	read -r opt
	case "$opt" in
	n* | N*)
		pln "${PURPLE}skipped${RESET}."
		exit 1
		;;
	*) ;;
	esac
}
#-----------
# fn check_command(cmd_name: &str, sleep_time: u8, exit_code: u8)
check_command() {
	cmd_name=$1
	sleep_time=$2
	exit_code=$3
	if [ -z "$(command -v "$cmd_name")" ]; then
		pln \
			"${RED}${BOLD}ERROR" \
			"${CYAN}Please install ${GREEN}""$cmd_name""${RESET} first"

		sleep "$sleep_time"
		exit "$exit_code"
	fi
}

# fn curl_file(timeout: u8, url: &str) -> bool
curl_file() {
	timeout_u8=$1
	url_str=$2

	curl \
		--connect-timeout "$timeout_u8" \
		-Lvo \
		"${TEMP_FILE}" \
		"$url_str" ||
		false
}

download_temp_file() {
	check_command curl 2 127
	cd "${TMPDIR}" || exit 1

	# todo: Allows different architectures & systems to obtain different URLs.
	if (! curl_file 7 "${TMOE_URL}"); then
		pln \
			"${BLUE}Connection ${RED}timeout" \
			"${GREEN}Retrying${RESET} ..."

		curl_file 20 "${TMOE_URL_02}" ||
			pln \
				"${PURPLE}Unfortunately, ${CYAN}download ${RED}failed${RESET}." \
				"Please ${YELLOW}press ${GREEN}Ctrl+C ${PURPLE}to abort${RESET}"
	fi
}

exec_temp_file() {
	check_command bash 3 127
	[ ! -s .tmoe-linux.sh ] || bash .tmoe-linux.sh
}
#-----------
show_info_and_run_the_temp_file() {
	show_package_info
	do_you_want_to_continue
	download_temp_file
	exec_temp_file
}
check_manager_file() {
	unset MANAGER_FILE
	for i in "${TMOE_GIT_DIR}/${TMOE_MANAGER}" "${TMOE_GIT_DIR_02}/${TMOE_MANAGER}"; do
		if [ -s "${i}" ]; then
			MANAGER_FILE="${i}"
			break
		fi
	done
	case "${MANAGER_FILE}" in
	"") show_info_and_run_the_temp_file ;;
	*) bash "${MANAGER_FILE}" ;;
	esac
}
#----------------
main() {
	set_env
	check_manager_file
}
#----------------
main "${@}"