local gfs        = require("gears.filesystem")
local gears      = require("gears")
local theme_path = gfs.get_configuration_dir() .. "/theme/"
local icon_cache = {}
local helpers    = require("helpers")
local t          = helpers.readJson(gears.filesystem.get_cache_dir() .. "json/settings.json").iconTheme


local custom = {
  {
    name = "clearpad",
    to = "terminal"
  },
  {
    name = "ncmpcpppad",
    to = "deepin-music-player"
  },
}

local function hasValue(str)
  local f = false
  local ind = 0
  for i, j in ipairs(custom) do
    if j.name == str then
      f = true
      ind = i
      break
    end
  end
  return f, ind
end


local function Get_icon(client, program_string, class_string)
  client = client or nil
  program_string = program_string or nil
  class_string = class_string or nil

  if (client or program_string or class_string) then
    local clientName
    local isCustom, pos = hasValue(class_string)
    if isCustom == true then
      clientName = custom[pos].to .. ".svg"
    elseif client then
      if client.class then
        clientName = string.lower(client.class:gsub(" ", "")) .. ".svg"
      elseif client.name then
        clientName = string.lower(client.name:gsub(" ", "")) .. ".svg"
      else
        if client.icon then
          return client.icon
        else
          return t .. "/apps/default-application.svg"
        end
      end
    else
      if program_string then
        clientName = program_string .. ".svg"
      else
        clientName = class_string .. ".svg"
      end
    end

    for index, icon in ipairs(icon_cache) do
      if icon:match(clientName) then
        return icon
      end
    end

    local iconDir = t .. "/apps/"
    local ioStream = io.open(iconDir .. clientName, "r")
    if ioStream ~= nil then
      icon_cache[#icon_cache + 1] = iconDir .. clientName
      return iconDir .. clientName
    else
      clientName = clientName:gsub("^%l", string.upper)
      iconDir = t .. "/apps//"
      ioStream = io.open(iconDir .. clientName, "r")
      if ioStream ~= nil then
        icon_cache[#icon_cache + 1] = iconDir .. clientName
        return iconDir .. clientName
      elseif not class_string then
        return t .. "/apps/default-application.svg"
      else
        clientName = class_string .. ".svg"
        iconDir = t .. "/apps/"
        ioStream = io.open(iconDir .. clientName, "r")
        if ioStream ~= nil then
          icon_cache[#icon_cache + 1] = iconDir .. clientName
          return iconDir .. clientName
        else
          return t .. "/apps/default-application.svg"
        end
      end
    end
  end
  if client then
    return t .. "/apps/default-application.svg"
  end
end


return Get_icon