#!/bin/sh /etc/rc.common
# Copyright (C) 2010-2015 OpenWrt.org

START=99
STOP=10
USE_PROCD=1
PROG="/usr/bin/transmission-daemon"

LIST_SEP="
"

append_params() {
	local p; local v; local s="$1"; shift
	IFS="$LIST_SEP"
	for p in "$@"; do
		config_get v "$s" "$p"
		for v in $v; do
			[ -n "$v" ] && echo "\"$p\": $v," | sed -e 's|_|-|g'
		done
	done
	unset IFS
}

append_params_quotes() {
	local p; local v; local s="$1"; shift
	IFS="$LIST_SEP"
	for p in "$@"; do
		config_get v "$s" "$p"
		for v in $v; do
			[ -n "$v" ] && {
				printf "\"%s" "$p" | sed -e 's|/|\\/|g;s|_|-|g'; \
				echo "\": \"$v\","
			}
		done
	done
	unset IFS
}

transmission() {
	local cfg="$1"

	local enabled
	config_get_bool enabled "$cfg" enabled 0
	[ "$enabled" -gt 0 ] || {
		echo "Transmission not enabled. Please enable in /etc/config/transmission"
		logger -t "transmission" -p "daemon.info" "Transmission not enabled. Please enable in /etc/config/transmission"
		return 1
	}

	local config_dir
	config_get config_dir "$cfg" 'config_dir' '/var/etc/transmission'
	local user
	config_get user "$cfg" 'user'
	local group
	config_get group "$cfg" 'group'
	local download_dir
	config_get download_dir "$cfg" 'download_dir' '/var/etc/transmission'
	local incomplete_dir
	config_get incomplete_dir "$cfg" 'incomplete_dir' '/var/etc/transmission'
	local incomplete_dir_enabled
	config_get incomplete_dir_enabled "$cfg" 'incomplete_dir_enabled' 0
	local mem_percentage
	config_get mem_percentage "$cfg" 'mem_percentage' '50'
	local config_overwrite
	config_get config_overwrite "$cfg" config_overwrite 1
	local nice
	config_get nice "$cfg" nice 0
	local web_home
	config_get web_home "$cfg" 'web_home'
	local seccomp_path

	local MEM
	MEM=$(sed -ne 's!^MemTotal:[[:space:]]*\([0-9]*\) kB$!\1!p' /proc/meminfo)
	local USE
	[ "$MEM" -gt 1 ] && USE=$((MEM * mem_percentage * 10))

	config_file="$config_dir/settings.json"
	[ -d "$config_dir" ] || {
		mkdir -p "$config_dir"
		chmod 0755 "$config_dir"
		touch "$config_file"
		mkdir -p "$config_dir/resume"
		mkdir -p "$config_dir/torrents"
		mkdir -p "$config_dir/blocklists"
		[ -e "$config_dir/stats.json" ] || touch "$config_dir/stats.json"
		[ -z "$user" ] || chown -R "$user:$group" "$config_dir"
	}

	[ -d "$download_dir" ] || {
		mkdir -p "$download_dir"
		chmod 0755 "$download_dir"
		[ -z "$user" ] || chown -R "$user:$group" "$download_dir"
	}

	[ "$incomplete_dir_enabled" = "0" ] || [ -d "$incomplete_dir" ] || {
		mkdir -p "$incomplete_dir"
		chmod 0755 "$incomplete_dir"
		[ -z "$user" ] || chown -R "$user:$group" "$incomplete_dir"
	}

	[ "$config_overwrite" = 0 ] || {

		echo "{"

		append_params "$cfg" \
			alt_speed_down alt_speed_enabled alt_speed_time_begin alt_speed_time_day \
			alt_speed_time_enabled alt_speed_time_end alt_speed_up blocklist_enabled \
			cache_size_mb download_queue_enabled download_queue_size \
			dht_enabled encryption idle_seeding_limit idle_seeding_limit_enabled \
			incomplete_dir_enabled lazy_bitfield_enabled lpd_enabled message_level \
			peer_id_ttl_hours peer_limit_global peer_limit_per_torrent peer_port \
			peer_port_random_high peer_port_random_low peer_port_random_on_start \
			pex_enabled port_forwarding_enabled preallocation prefetch_enabled \
			ratio_limit ratio_limit_enabled rename_partial_files rpc_authentication_required \
			rpc_enabled rpc_port rpc_whitelist_enabled queue_stalled_enabled \
			queue_stalled_minutes scrape_paused_torrents_enabled script_torrent_done_enabled \
			seed_queue_enabled seed_queue_size \
			speed_limit_down speed_limit_down_enabled speed_limit_up \
			speed_limit_up_enabled start_added_torrents trash_original_torrent_files \
			umask upload_slots_per_torrent utp_enabled \
			watch_dir_enabled rpc_host_whitelist_enabled

		append_params_quotes "$cfg" \
			blocklist_url bind_address_ipv4 bind_address_ipv6 download_dir incomplete_dir \
			peer_congestion_algorithm peer_socket_tos rpc_bind_address rpc_password rpc_url \
			rpc_username rpc_host_whitelist rpc_whitelist script_torrent_done_filename watch_dir

			echo "\"invalid-key\": false"
			echo "}"

	} > "$config_file"

	procd_open_instance
	procd_set_param command "$PROG"
	procd_append_param command -f -g "$config_dir"
	procd_set_param user "$user"
	procd_set_param group "$group"
	procd_set_param nice "$nice"
	procd_set_param stderr 1
	procd_set_param respawn

	seccomp_path="/etc/seccomp/transmission-daemon.json"
	if [ -f "$seccomp_path" ]; then
		procd_set_param seccomp "$seccomp_path"
	fi

	if [ -z "$USE" ]; then
		procd_set_param limits core="0 0"
	else
		procd_set_param limits core="0 0" as="$USE $USE"
		logger -t transmission "Starting with $USE virt mem"
	fi

	[ -d "$web_home" ] && procd_set_param env TRANSMISSION_WEB_HOME="$web_home"

	procd_add_jail transmission log
	procd_add_jail_mount "$config_file"
	procd_add_jail_mount_rw "$config_dir/resume"
	procd_add_jail_mount_rw "$config_dir/torrents"
	procd_add_jail_mount_rw "$config_dir/blocklists"
	procd_add_jail_mount_rw "$config_dir/stats.json"
	procd_add_jail_mount_rw "$download_dir"
	web_home="${web_home:-/usr/share/transmission/web}"
	[ -d "$web_home" ] && procd_add_jail_mount "$web_home"
	procd_close_instance
}

start_service() {
	config_load 'transmission'
	config_foreach transmission 'transmission'
}

reload_service() {
	procd_send_signal "$PROG"
}

transmission_mount_triggers() {
	local cfg="$1"

	local enabled
	config_get_bool enabled "$cfg" enabled 0
	[ "$enabled" -gt 0 ] || return 0

	local config_dir download_dir incomplete_dir incomplete_dir_enabled \
		watch_dir watch_dir_enabled web_home service_dirs
	config_get config_dir "$cfg" 'config_dir' '/var/etc/transmission'
	config_get download_dir "$cfg" 'download_dir' '/var/etc/transmission'
	config_get incomplete_dir_enabled "$cfg" 'incomplete_dir_enabled' 0
	config_get incomplete_dir "$cfg" 'incomplete_dir' '/var/etc/transmission'
	config_get watch_dir_enabled "$cfg" 'watch_dir_enabled' 0
	config_get watch_dir "$cfg" 'watch_dir' '/var/etc/transmission'
	config_get web_home "$cfg" 'web_home'

	service_dirs="$config_dir $download_dir $web_home"
	[ "$incomplete_dir_enabled" = "0" ] || service_dirs="$service_dirs $incomplete_dir"
	[ "$watch_dir_enabled" = "0" ] || service_dirs="$service_dirs $watch_dir"

	procd_add_restart_mount_trigger $service_dirs
}

service_triggers() {
	procd_add_reload_trigger 'transmission'
	config_load 'transmission'
	config_foreach transmission_mount_triggers 'transmission'
}