#!/bin/sh /etc/rc.common
# Copyright (C) 2023 Tianling Shen <cnsztl@immortalwrt.org>

USE_PROCD=0
START=98

CONF="daed"
PROG="/usr/bin/daed"
LOG="/var/log/daed/daed.log"
RESOLV_DAED="/tmp/resolv.conf.daed"

update_cron() {
  local temp_cron="/tmp/root.cron"

  if [ -f /etc/crontabs/root ]; then
    grep -v '/etc/daed/daed_sub.sh' /etc/crontabs/root > "$temp_cron" 2>/dev/null
  fi
  : >> "$temp_cron"

  local auto_update
  auto_update=$(uci -q get daed.config.subscribe_auto_update)
  if [ "$1" = "add" ] && [ "${auto_update:-0}" -eq 1 ]; then
    local min=$((RANDOM % 60))
    local hr=$(uci -q get daed.config.subscribe_update_day_time)
    local wk=$(uci -q get daed.config.subscribe_update_week_time)
    echo "$min ${hr:-*} * * ${wk:-*} /etc/daed/daed_sub.sh >/dev/null 2>&1" >> "$temp_cron"
  fi

  crontab "$temp_cron" 2>/dev/null
  rm -f "$temp_cron"
}

hijack_resolv_conf() {
    grep -q ' /tmp/resolv\.conf ' /proc/mounts && return 0

    grep -E '^(search|domain) ' /tmp/resolv.conf > "$RESOLV_DAED" 2>/dev/null

    local dns_list LOGICAL_WAN
    . /lib/functions/network.sh
    network_find_wan LOGICAL_WAN 2>/dev/null
    if [ -n "$LOGICAL_WAN" ]; then
        dns_list=$(ubus call "network.interface.$LOGICAL_WAN" status 2>/dev/null | \
            jsonfilter -e '@["dns-server"][*]' 2>/dev/null)
    fi

    if [ -z "$dns_list" ] && [ -f "/tmp/resolv.conf.d/resolv.conf.auto" ]; then
        dns_list=$(awk '/^nameserver/{print $2}' "/tmp/resolv.conf.d/resolv.conf.auto")
    fi

    [ -z "$dns_list" ] && dns_list="119.29.29.29 223.5.5.5"

    for dns in $dns_list; do
        echo "nameserver $dns" >> "$RESOLV_DAED"
    done

    mount --bind "$RESOLV_DAED" /tmp/resolv.conf
    mount -o remount,ro,bind /tmp/resolv.conf
}

restore_resolv_conf() {
  grep -q ' /tmp/resolv\.conf ' /proc/mounts || return 0
  mount -o remount,rw,bind /tmp/resolv.conf 2>/dev/null
  umount /tmp/resolv.conf 2>/dev/null
  rm -f "$RESOLV_DAED"
}

start_service() {
  [ -f "/etc/init.d/daed" ] && grep -q "DAE_LOCATION_ASSET" "/etc/init.d/daed" || sed -i '/run/i\  procd_set_param env DAE_LOCATION_ASSET="/usr/share/v2ray"' "/etc/init.d/daed"
  config_load "$CONF"

  local enabled
  config_get_bool enabled "config" "enabled" "0"
  if [ "$enabled" -eq 0 ]; then
    update_cron "remove"
    restore_resolv_conf
    return 1
  fi
  update_cron "add"
  hijack_resolv_conf
}

stop_service() {
  update_cron "remove"
  restore_resolv_conf
}

service_triggers() {
  procd_add_reload_trigger "$CONF"
}

reload_service() {
	restart
}