local cef = require("luacef")

-- new CefMainArgs, CefApp
local args, app = cef.newMainArgs(), cef.newApp() 

-- print version
cef.printv()

-- new CefSettings
local settings = cef.newSettings {
    log_severity = 99;  -- disable debug log and log file       
    single_process = 1; -- must set single-process for Lua command line 
}

-- enable high DPI support
cef.EnableHighDPISupport()

-- initialize application
local code = cef.Initialize(args, settings, app)
if (code == 0) then os.exit() end

-- create CefWindowInfo
local window_info = cef.newWindowInfo {
    -- set window name
    window_name = "Hello - LuaCEF"; -- Lua string be convert to cef string, accept unicode
    style = 0x10cf0000
}

-- create CefBrowserSettings for creating browser
local browser_settings = cef.newBrowserSettings()

-- create CefLifeSpanHandler
local life_span = cef.newLifeSpanHandler {
    -- implement OnAfterCreated callback function
    OnAfterCreated = function(self, browser) -- event
        print("-- on after created --")
        print(self, browser) --> CefLifeSpanHandler: <addr>, Browser: <addr>
        print('Window handle: ', browser:GetHost():GetWindowHandle())
    end;
}

-- implement OnBeforeClose with other way
function life_span:OnBeforeClose(browser)
    print("-- on before close --")
    -- test browser's method
    print('can go back:', browser:CanGoBack())
    print('can go forward:', browser:CanGoForward())
    -- quit cef messgae loop
    cef.QuitMessageLoop()
end;

-- CefKeyboardHandler
keyboard = cef.newKeyboardHandler {
    -- pre-key event
    OnPreKeyEvent = function(self, browser, event, os_event, is_keyboard_shortcut)
        if event.type == 2 then -- test release key
            if event.windows_key_code == 0xd then
                print('Enter key released')
            elseif event.windows_key_code == 0x1b then
                print('ESC key released')
            end
        end
        return 0
    end;
}

-- new CefClient
local client = cef.newClient {
    -- register CefLifeSpanHandler
    GetLifeSpanHandler = function(self) 
        return life_span
    end;
    -- register CefKeyboardHandler
    GetKeyboardHandler = function(self)
        return keyboard
    end;
}

-- url, native lua string
local url = 'https://www.google.com/'

-- create browser window
cef.CreateBrowser(window_info, client, url, browser_settings, nil)

-- run message loop
-- in cef settings, if multi_threaded_message_loop is true (1), must use window message loop
cef.RunMessageLoop()

-- shutdown
cef.Shutdown()