# -*- coding: utf-8 -*-

# Copyright (c) 2018 - 2019 Detlev Offenbach <detlev@die-offenbachs.de>
#


"""
Module implementing the single application server and client for the web
browser.
"""


from PyQt5.QtCore import pyqtSignal

from Toolbox.SingleApplication import (
    SingleApplicationClient, SingleApplicationServer
)

import Globals

###########################################################################
## define some module global stuff
###########################################################################

SAFile = "eric6_browser"

# define the protocol tokens
SALoadUrl = 'LoadUrl'
SANewTab = 'NewTab'
SASearch = 'Search'
SAShutdown = 'Shutdown'


class WebBrowserSingleApplicationServer(SingleApplicationServer):
    """
    Class implementing the single application server embedded within the
    Web Browser.
    
    @signal loadUrl(str) emitted to load an URL
    @signal newTab(str) emitted to load an URL in a new tab
    @signal search(str) emitted to search for a given word
    @signal shutdown() emitted to shut down the browser
    """
    loadUrl = pyqtSignal(str)
    newTab = pyqtSignal(str)
    search = pyqtSignal(str)
    shutdown = pyqtSignal()
    
    def __init__(self, name=""):
        """
        Constructor
        
        @param name name to be used by the single application server
        @type str
        """
        if not name:
            name = SAFile
        
        SingleApplicationServer.__init__(self, name)

    def handleCommand(self, command, arguments):
        """
        Public slot to handle the command sent by the client.
        
        @param command command sent by the client
        @type str
        @param arguments list of command arguments
        @type list of str
        """
        if command == SALoadUrl:
            self.__saLoadUrl(arguments[0])
        
        elif command == SANewTab:
            self.__saNewTab(arguments[0])
        
        elif command == SASearch:
            self.__saSearch(arguments[0])
        
        elif command == SAShutdown:
            self.__saShutdown()
    
    def __saLoadUrl(self, url):
        """
        Private method to load an URL in a new tab.
        
        @param url URL to be loaded
        @type str
        """
        self.loadUrl.emit(url)
    
    def __saNewTab(self, url):
        """
        Private method to load an URL .
        
        @param url URL to be loaded
        @type str
        """
        self.newTab.emit(url)
    
    def __saSearch(self, word):
        """
        Private method to search for a given word.
        
        @param word word to be searched for
        @type str
        """
        self.search.emit(word)
    
    def __saShutdown(self):
        """
        Private method to shut down the web browser.
        """
        self.shutdown.emit()


class WebBrowserSingleApplicationClient(SingleApplicationClient):
    """
    Class implementing the single application client of the web browser.
    """
    def __init__(self, name=""):
        """
        Constructor
        
        @param name name to be used by the single application server
        @type str
        """
        if not name:
            name = SAFile
        
        SingleApplicationClient.__init__(self, name)
    
    def processArgs(self, args, disconnect=True):
        """
        Public method to process the command line args passed to the UI.
        
        @param args list of command line arguments
        @type list of str
        @param disconnect flag indicating to disconnect when done
        @type bool
        """
        # no args, return
        if args is None:
            return
        
        if Globals.isWindowsPlatform():
            argChars = ('-', '/')
        else:
            argChars = ('-', )
        
        for arg in args:
            if arg.startswith("--search="):
                self.__search(arg.replace("--search=", ""))
            elif arg.startswith("--newtab="):
                self.__newTab(arg.replace("--newtab=", ""))
            elif arg == "--shutdown":
                self.__shutdown()
            elif not arg.startswith(argChars):
                # it is an URL
                self.__loadUrl(arg)
        
        if disconnect:
            self.disconnect()
    
    def __loadUrl(self, url):
        """
        Private method to send an URL to be loaded.
        
        @param url URL to be loaded
        @type str
        """
        self.sendCommand(SALoadUrl, [url])
    
    def __newTab(self, url):
        """
        Private method to send an URL to be loaded in a new tab.
        
        @param url URL to be loaded
        @type str
        """
        self.sendCommand(SANewTab, [url])
    
    def __search(self, word):
        """
        Private method to send a word to search for.
        
        @param word to to be searched for
        @type str
        """
        self.sendCommand(SASearch, [word])
    
    def __shutdown(self):
        """
        Private method to signal a shutdown request to the browser.
        """
        self.sendCommand(SAShutdown, [])
