#!/usr/bin/lua

local util   = require "luci.util"
local string = require "string"
local io     = require "io"
local json   = require "luci.jsonc"
local uci    = require "luci.model.uci".cursor()
local client = require "luci.httpclient"
local helper = require "luci.helper"

-- get cloud version
function get_cloud_version()
  -- get cloud url
  local url = uci:get("easyupdate", "main", "domain")
  -- get request channel
  local channel = uci:get("easyupdate", "main", "channel")
  -- appid
  local appid = uci:get("easyupdate", "main", "appid")
  -- read brand and model from file
  local brand, model = helper.get_board_info()
  -- platfrom
  local platform = 11
  -- create http request options 
  local options = {}
  -- create http request method
  options.method = "POST"
  -- create http request headers
  options.headers = {}
  options.headers['appId'] = appid
  options.headers['reqChannel'] = channel
  options.headers['Content-Type'] = 'application/json'
  -- create http request body
  local body = {
    -- 
    ['appId'] = 'spRouterPlugin_fhem2shgq9s5',
    ['brand'] = brand,
    ['model'] = model,
    ['platform'] = platform,
  }
  -- marshal to json
  local buf = util.serialize_json(body)
  options.body = buf
  -- begin to query
  local status, _, buffer, _ = client.request_raw(url, options)
  -- check if query success
  if not status then
    io.write("status is nil \n")
    return ""
  end
  -- check if request success
  if status ~= 200 and status ~=206 then
    io.write("status is not success, status: " .. status .. "\n")
    return ""
  end
  -- begin to parse response
  local info = json.parse(buffer)
  -- get ret data
  local data = info['retData']
  -- check if data is nil
  if data == nil then
    io.write("response ret data is nil \n")
    return ""
  end
  -- store url in config
  local fw_url = data['url']
  local version = data['versionName']
  io.write("fw_url: " .. fw_url .. ", version: " .. version .. "\n")
  -- get version success
  return version, fw_url
end

-- get local version
function get_local_version()
  -- run command to get acc version
  local cmd = 'opkg info acc'
  local buf = util.exec(cmd)
  -- check exec result
  if buf == nil then
    io.write("exec command failed \n")
    return ""
  end
  io.write("buf: " .. buf .. "\n")
  -- read line 
  for line in string.gmatch(buf, "[^\r\n]+") do
    io.write("read line: " .. line .. "\n")
    line = string.gsub(line, " ", "")
    local valueSl = string.gmatch(line, "[^:]+")
    local key = valueSl()
    local value = valueSl()
    if key == "Version" then
      io.write("get local version: " .. value .. "\n")
      return value
    end
  end
  io.write("local version cant found \n")
end

-- get file base name
function get_file_base_name(filepath)
  local name = string.gmatch(filepath, "([^/]+)$")
  io.write("get file base name: " .. name .. "\n")
  return name
end

-- download cloud version
function download_cloud_app(url, name)
  io.write("download app, url: " .. url .. ", name: " .. name .. "\n")
  -- run download 
  local cmd = 'curl -s -o /tmp/' .. name ..' -w %{http_code}' .. ' ' .. url
  -- exec download 
  local code = util.exec(cmd)
  if code ~= "200" then
    io.write("download cloud app failed, code: " .. code .. "\n")
    return false
  end
  io.write("download cloud app success \n")
  return code
end

-- install package name in tmp dir
function install_package(name)
  io.write("install package, package name: " .. name .. "\n")
  local cmd = "opkg install " .. "/tmp/" .. name .. " " .. "--force-overwrite"
  local code = util.exec(cmd)
  io.write("install package finish, package name: " .. name .. "\n")
  return code
end

-- remove pkg
function remove_pkg(name)
  io.write("remove package, package name: " .. name .. "\n")
  local cmd = "rm -rf " .. "/tmp/" .. name
  local code = util.exec(cmd)
  io.write("remove package finish, package name: " .. name .. "\n")
  return code
end

-- check network state
io.write("check network state \n")
while true do
  local state_code = helper.get_network_state()
  if state_code == 200 then
    io.write("network available \n")
    break
  end
  if state_code ~= nil then
    io.write("network is not available, code: " .. state_code .. "\n")
  end
end
io.write("network success")

-- exec command
local local_version = get_local_version()
local cloud_version, url = get_cloud_version()
-- check if need update
if local_version >= cloud_version then
  io.write("local version is new, dont need update, local ver: " .. local_version ..
    ", cloud version:" .. cloud_version .. "\n")
  return
end

-- need update
io.write("local version is lower, need update, local version: " .. local_version ..
  ", cloud version: " .. cloud_version .. "\n")

-- download url
local name = "acc.ipk"
local result = download_cloud_app(url, name)
if not result then
  return
end

-- install package
install_package(name)
remove_pkg(name)