#! /usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Copyright 2021, Nils Hilbricht, Germany ( https://www.hilbricht.net )

This file is part of the Laborejo Software Suite ( https://www.laborejo.org ).

This application is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""

import logging; logger = logging.getLogger(__name__); logger.info("import")

#Standard Library

#Engine
import engine.api as api

#Third Party
from PyQt5 import  QtCore, QtWidgets

class PromptWidget(QtWidgets.QDialog):

    wordlist = None
    minlen = None

    def __init__(self, parent):
        super().__init__(parent)
        layout = QtWidgets.QFormLayout()
        #layout = QtWidgets.QVBoxLayout()

        updateWordlist() #this is a fast index update, we can call that every time to be sure. Otherwise newly added executable-PATHs will not be reflected in the dialog without a program-database update, which takes too long to be convenient.

        self.setLayout(layout)
        self.setWindowFlag(QtCore.Qt.Popup, True)

        self.comboBox = QtWidgets.QComboBox(self)
        self.comboBox.setEditable(True)

        self.comboBox.currentTextChanged.connect(self.check) #not called when text is changed programatically

        if PromptWidget.wordlist:
            completer = QtWidgets.QCompleter(PromptWidget.wordlist)
            completer.setModelSorting(QtWidgets.QCompleter.CaseInsensitivelySortedModel)
            completer.setCaseSensitivity(QtCore.Qt.CaseInsensitive)
            completer.setCompletionMode(QtWidgets.QCompleter.PopupCompletion)
            completer.activated.connect(self.process) #To avoid double-press enter to select one we hook into the activated signal and trigger process
            self.comboBox.setCompleter(completer)
            self.comboBox.setMinimumContentsLength(PromptWidget.minlen)
            labelString = QtCore.QCoreApplication.translate("PromptWidget", "Type in the name of an executable file on your system.")
        else:
            labelString = QtCore.QCoreApplication.translate("PromptWidget", "No program database found. Please update through Control menu.")

        label = QtWidgets.QLabel(labelString)
        layout.addWidget(label)
        self.comboBox.setSizeAdjustPolicy(QtWidgets.QComboBox.AdjustToMinimumContentsLength)

        layout.addWidget(self.comboBox)

        errorString = QtCore.QCoreApplication.translate("PromptWidget", "Command not found or not accepted!<br>Parameters, --switches and relative paths are not allowed.<br>Use nsm-proxy or write a starter-script instead.")
        errorString = "<i>" + errorString + "</i>"
        self.errorLabel = QtWidgets.QLabel(errorString)
        layout.addWidget(self.errorLabel)
        self.errorLabel.hide() #shown in process or check

        self.buttonBox = QtWidgets.QDialogButtonBox(QtWidgets.QDialogButtonBox.Ok | QtWidgets.QDialogButtonBox.Cancel)
        self.buttonBox.accepted.connect(self.process)
        self.buttonBox.rejected.connect(self.reject)
        layout.addWidget(self.buttonBox)

        self.exec() #blocks until the dialog gets closed

    def abortHandler(self):
        pass


    def check(self, currentText):
        """Called every keypress.
        We do preliminary error and collision checking here, so the engine does not have to throw
        an error """
        self.errorLabel.hide() #start in good faith
        ok = self.buttonBox.button(QtWidgets.QDialogButtonBox.Ok)
        if currentText in PromptWidget.wordlist: #this is taken literally. Any extra char or whitespace counts as false
            ok.setEnabled(True)
        else:
            ok.setEnabled(False)
            self.errorLabel.show()


    def process(self):
        """Careful! Calling this eats python errors without notice.
        Make sure your objects exists and your syntax is correct"""
        assert PromptWidget.wordlist
        assert PromptWidget.minlen

        curText = self.comboBox.currentText()
        if not curText or curText == " ": #TODO: qt weirdness. This is a case when focus is lost from a valid entry. The field is filled from a chosen value, from the list. But it says " ".
            #Do not show the errorLabel. This is a qt bug or so.
            return

        if curText in PromptWidget.wordlist:
            api.clientAdd(curText)
            logger.info(f"Prompt accepted {curText} and will send it to clientAdd")
            self.done(True)
        else:
            logger.info(f"Prompt did not accept {curText}.Showing info to the user.")
            self.errorLabel.show()


def updateWordlist():
    """in case programs are installed while the session is running the user can
    manually call a database update"""
    PromptWidget.wordlist = api.getUnfilteredExecutables()
    if PromptWidget.wordlist:
        PromptWidget.minlen = len(max(PromptWidget.wordlist, key=len))
    else:
        logger.error("Executable list came back empty! Most likely an error in application database build. Not trivial!")

def askForExecutable(parent):
    PromptWidget(parent)