#!/bin/env python3
import gex

import sys
from PyQt4 import QtGui, QtCore
import ini_syntax

class GexIniEditor(QtGui.QMainWindow):
    """
    Gexync is a GEX ini file editor.
    The editor loads the INI file through the communication interface
    without having to mount the virtual filesystem, which is unreliable
    on some systems.

    This utility allows live editing of the UNITS.INI file.

    On save, a new version is loaded with formatting and error messages
    generated by GEX, as if the virtual config filesystem was re-mounted.

    The editor does not keep GEX claimed, instead does so only when needed.
    This allows testing of the current configuration without having to close
    and reopen the editor.
    """

    def __init__(self):
        super().__init__()
        self.initUI()
        # TODO let user pick GEX device if multiple

    def initToolbar(self):
        icon = self.style().standardIcon(QtGui.QStyle.SP_BrowserReload)
        loadAction = QtGui.QAction(icon, 'Reload', self)
        loadAction.setShortcut('Ctrl+O')
        loadAction.triggered.connect(self.gexLoad)

        icon = self.style().standardIcon(QtGui.QStyle.SP_DialogSaveButton)
        syncAction = QtGui.QAction(icon, 'Write Changes', self)
        syncAction.setShortcut('Ctrl+S')
        syncAction.triggered.connect(self.gexSync)

        icon = self.style().standardIcon(QtGui.QStyle.SP_DialogOkButton)
        persAction = QtGui.QAction(icon, 'Persist, Close', self)
        persAction.setShortcut('Ctrl+P')
        persAction.triggered.connect(self.gexPersist)

        self.toolbar = self.addToolBar('Toolbar')
        self.toolbar.setToolButtonStyle(QtCore.Qt.ToolButtonTextBesideIcon)
        self.toolbar.addAction(loadAction)
        self.toolbar.addAction(syncAction)
        self.toolbar.addSeparator()
        self.toolbar.addAction(persAction)

    def initEditor(self):
        self.editor = QtGui.QPlainTextEdit()

        # Editor background and text color
        pal = QtGui.QPalette()
        bgc = QtGui.QColor(0xFFFFF6)
        pal.setColor(QtGui.QPalette.Base, bgc)
        textc = QtGui.QColor(0x000000)
        pal.setColor(QtGui.QPalette.Text, textc)
        self.editor.setPalette(pal)
        # Font
        font = QtGui.QFont('Liberation Mono', 12)
        font.setStyleHint(QtGui.QFont.TypeWriter)
        self.editor.setFont(font)
        # Initial size
        self.highlight = ini_syntax.IniHighlighter(self.editor.document())

    def initUI(self):
        self.setWindowTitle('GEX config file editor')
        self.initToolbar()
        self.initEditor()
        self.setCentralWidget(self.editor)
        self.show()

        self.gexLoad()

    def gexLoad(self):
        self.editor.setPlainText("")
        self.editor.repaint()

        client = gex.Client(gex.TrxRawUSB(), load_units=False)
        read_ini = client.ini_read()
        client.close()

        self.editor.setPlainText(read_ini)
        self.highlight.rehighlight()

    def gexSync(self):
        new_txt = self.editor.toPlainText()
        self.editor.setPlainText("")
        self.editor.repaint()

        client = gex.Client(gex.TrxRawUSB(), load_units=False)
        client.ini_write(new_txt)
        read_ini = client.ini_read()
        client.close()

        self.editor.setPlainText(read_ini)
        self.highlight.rehighlight()

    def gexPersist(self):
        client = gex.Client(gex.TrxRawUSB(), load_units=False)
        client.ini_persist()
        client.close()
        self.close()

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    editor = GexIniEditor()

    # centered resize
    w = 800
    h = 900
    ss = app.desktop().availableGeometry().size()
    editor.setGeometry(int(ss.width() / 2 - w / 2), int(ss.height() / 2 - h / 2), w, h)

    sys.exit(app.exec_())