RadonMetrics/MaintainabilityIndexDialog.py

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

# Copyright (c) 2015 - 2020 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to show maintainability indexes.
"""

import os
import fnmatch

from PyQt5.QtCore import pyqtSlot, qVersion, Qt, QTimer, QLocale
from PyQt5.QtGui import QColor
from PyQt5.QtWidgets import (
    QDialog, QDialogButtonBox, QAbstractButton, QHeaderView, QTreeWidgetItem,
    QApplication
)

from .Ui_MaintainabilityIndexDialog import Ui_MaintainabilityIndexDialog
from E5Gui.E5Application import e5App

import Preferences
import Utilities


class MaintainabilityIndexDialog(QDialog, Ui_MaintainabilityIndexDialog):
    """
    Class implementing a dialog to show maintainability indexes.
    """
    FilePathRole = Qt.UserRole + 1
    
    def __init__(self, radonService, parent=None):
        """
        Constructor
        
        @param radonService reference to the service
        @type RadonMetricsPlugin
        @param parent reference to the parent widget
        @type QWidget
        """
        super(MaintainabilityIndexDialog, self).__init__(parent)
        self.setupUi(self)
        self.setWindowFlags(Qt.Window)
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        
        self.resultList.headerItem().setText(self.resultList.columnCount(), "")
        
        self.radonService = radonService
        self.radonService.maintainabilityIndexDone.connect(
            self.__processResult)
        self.radonService.error.connect(self.__processError)
        self.radonService.batchFinished.connect(self.__batchFinished)
        
        self.cancelled = False
        
        self.__project = e5App().getObject("Project")
        self.__locale = QLocale()
        self.__finished = True
        self.__errorItem = None
        
        self.__fileList = []
        self.filterFrame.setVisible(False)
        
        self.explanationLabel.setText(self.tr(
            "<table>"
            "<tr><td><b>Rank</b></td><td><b>MI Score</b></td>"
            "<td><b>Maintainability</b></td></tr>"
            "<tr><td><b>A</b></td><td>100 - 20</td><td>very high</td></tr>"
            "<tr><td><b>B</b></td><td>19 - 10</td><td>medium</td></tr>"
            "<tr><td><b>C</b></td><td>9 - 0</td><td>extremely low</td></tr>"
            "</table>"
        ))
        
        try:
            usesDarkPalette = e5App().usesDarkPalette()
        except AttributeError:
            from PyQt5.QtGui import QPalette
            palette = e5App().palette()
            lightness = palette.color(QPalette.Window).lightness()
            usesDarkPalette = lightness <= 128
        if usesDarkPalette:
            self.__rankColors = {
                "A": QColor("#308030"),
                "B": QColor("#808030"),
                "C": QColor("#803030"),
            }
        else:
            self.__rankColors = {
                "A": QColor("#00ff00"),
                "B": QColor("#ffff00"),
                "C": QColor("#ff0000"),
            }
    
    def __resizeResultColumns(self):
        """
        Private method to resize the list columns.
        """
        self.resultList.header().resizeSections(QHeaderView.ResizeToContents)
        self.resultList.header().setStretchLastSection(True)
    
    def __createResultItem(self, filename, values):
        """
        Private slot to create a new item in the result list.
        
        @param filename name of the file
        @type str
        @param values values to be displayed
        @type dict
        """
        data = [self.__project.getRelativePath(filename)]
        try:
            data.append("{0:>6}".format(
                self.__locale.toString(float(values["mi"]), "f", 2)))
        except ValueError:
            data.append(values["mi"])
        data.append(values["rank"])
        itm = QTreeWidgetItem(self.resultList, data)
        itm.setTextAlignment(1, Qt.Alignment(Qt.AlignRight))
        itm.setTextAlignment(2, Qt.Alignment(Qt.AlignHCenter))
        if values["rank"] in self.__rankColors:
            itm.setBackground(2, self.__rankColors[values["rank"]])
        itm.setData(0, self.FilePathRole, filename)
        
        if values["rank"] in self.__summary:
            self.__summary[values["rank"]] += 1
    
    def __createErrorItem(self, filename, message):
        """
        Private slot to create a new error item in the result list.
        
        @param filename name of the file
        @type str
        @param message error message
        @type str
        """
        if self.__errorItem is None:
            self.__errorItem = QTreeWidgetItem(self.resultList, [
                self.tr("Errors")])
            self.__errorItem.setExpanded(True)
            self.__errorItem.setForeground(0, Qt.red)
        
        msg = "{0} ({1})".format(self.__project.getRelativePath(filename),
                                 message)
        if not self.resultList.findItems(msg, Qt.MatchExactly):
            itm = QTreeWidgetItem(self.__errorItem, [msg])
            itm.setForeground(0, Qt.red)
            itm.setFirstColumnSpanned(True)
    
    def prepare(self, fileList, project):
        """
        Public method to prepare the dialog with a list of filenames.
        
        @param fileList list of filenames
        @type list of str
        @param project reference to the project object
        @type Project
        """
        self.__fileList = fileList[:]
        self.__project = project
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Close).setDefault(True)
        
        self.filterFrame.setVisible(True)
        
        self.__data = self.__project.getData(
            "OTHERTOOLSPARMS", "RadonCodeMetrics")
        if self.__data is None or "ExcludeFiles" not in self.__data:
            self.__data = {"ExcludeFiles": ""}
        self.excludeFilesEdit.setText(self.__data["ExcludeFiles"])
    
    def start(self, fn):
        """
        Public slot to start the maintainability index determination.
        
        @param fn file or list of files or directory to show
            the maintainability index for
        @type str or list of str
        """
        self.__errorItem = None
        self.resultList.clear()
        self.summaryLabel.clear()
        self.cancelled = False
        QApplication.processEvents()
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        QApplication.processEvents()
        
        if isinstance(fn, list):
            self.files = fn
        elif os.path.isdir(fn):
            self.files = []
            extensions = set(Preferences.getPython("PythonExtensions") +
                             Preferences.getPython("Python3Extensions"))
            for ext in extensions:
                self.files.extend(
                    Utilities.direntries(fn, True, '*{0}'.format(ext), 0))
        else:
            self.files = [fn]
        self.files.sort()
        # check for missing files
        for f in self.files[:]:
            if not os.path.exists(f):
                self.files.remove(f)
        
        self.__summary = {
            "A": 0,
            "B": 0,
            "C": 0,
        }
        
        if len(self.files) > 0:
            # disable updates of the list for speed
            self.resultList.setUpdatesEnabled(False)
            self.resultList.setSortingEnabled(False)
            
            self.checkProgress.setMaximum(len(self.files))
            self.checkProgress.setVisible(len(self.files) > 1)
            self.checkProgressLabel.setVisible(len(self.files) > 1)
            QApplication.processEvents()
            
            # now go through all the files
            self.progress = 0
            if len(self.files) == 1:
                self.__batch = False
                self.maintainabilityIndex()
            else:
                self.__batch = True
                self.maintainabilityIndexBatch()
    
    def maintainabilityIndex(self, codestring=''):
        """
        Public method to start a maintainability index calculation for one
        Python file.
        
        The results are reported to the __processResult slot.
        
        @keyparam codestring optional sourcestring
        @type str
        """
        if not self.files:
            self.checkProgressLabel.setPath("")
            self.checkProgress.setMaximum(1)
            self.checkProgress.setValue(1)
            self.__finish()
            return
        
        self.filename = self.files.pop(0)
        self.checkProgress.setValue(self.progress)
        self.checkProgressLabel.setPath(self.filename)
        QApplication.processEvents()
        
        if self.cancelled:
            return
        
        try:
            self.source = Utilities.readEncodedFile(self.filename)[0]
            self.source = Utilities.normalizeCode(self.source)
        except (UnicodeError, IOError) as msg:
            self.__createErrorItem(self.filename, str(msg).rstrip())
            self.progress += 1
            # Continue with next file
            self.maintainabilityIndex()
            return

        self.__finished = False
        self.radonService.maintainabilityIndex(
            None, self.filename, self.source)

    def maintainabilityIndexBatch(self):
        """
        Public method to start a maintainability index calculation batch job.
        
        The results are reported to the __processResult slot.
        """
        self.__lastFileItem = None
        
        self.checkProgressLabel.setPath(self.tr("Preparing files..."))
        progress = 0
        
        argumentsList = []
        for filename in self.files:
            progress += 1
            self.checkProgress.setValue(progress)
            QApplication.processEvents()
            
            try:
                source = Utilities.readEncodedFile(filename)[0]
                source = Utilities.normalizeCode(source)
            except (UnicodeError, IOError) as msg:
                self.__createErrorItem(filename, str(msg).rstrip())
                continue
            
            argumentsList.append((filename, source))
        
        # reset the progress bar to the checked files
        self.checkProgress.setValue(self.progress)
        QApplication.processEvents()
        
        self.__finished = False
        self.radonService.maintainabilityIndexBatch(argumentsList)
    
    def __batchFinished(self, type_):
        """
        Private slot handling the completion of a batch job.
        
        @param type_ type of the calculated metrics
        @type str, one of ["raw", "mi", "cc"]
        """
        if type_ == "mi":
            self.checkProgressLabel.setPath("")
            self.checkProgress.setMaximum(1)
            self.checkProgress.setValue(1)
            self.__finish()
    
    def __processError(self, type_, fn, msg):
        """
        Private slot to process an error indication from the service.
        
        @param type_ type of the calculated metrics
        @type str, one of ["raw", "mi", "cc"]
        @param fn filename of the file
        @type str
        @param msg error message
        @type str
        """
        if type_ == "mi":
            self.__createErrorItem(fn, msg)
    
    def __processResult(self, fn, result):
        """
        Private slot called after perfoming a maintainability index calculation
        on one file.
        
        @param fn filename of the file
        @type str
        @param result result dict
        @type dict
        """
        if self.__finished:
            return
        
        # Check if it's the requested file, otherwise ignore signal if not
        # in batch mode
        if not self.__batch and fn != self.filename:
            return
        
        self.checkProgressLabel.setPath(self.__project.getRelativePath(fn))
        QApplication.processEvents()
        
        if "error" in result:
            self.__createErrorItem(fn, result["error"])
        else:
            self.__createResultItem(fn, result)
        
        self.progress += 1
        
        self.checkProgress.setValue(self.progress)
        QApplication.processEvents()
        
        if not self.__batch:
            self.maintainabilityIndex()
    
    def __finish(self):
        """
        Private slot called when the action or the user pressed the button.
        """
        if not self.__finished:
            self.__finished = True
            
            # reenable updates of the list
            self.resultList.setSortingEnabled(True)
            self.resultList.sortItems(0, Qt.AscendingOrder)
            self.resultList.setUpdatesEnabled(True)
            
            self.cancelled = True
            self.buttonBox.button(QDialogButtonBox.Close).setEnabled(True)
            self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(False)
            self.buttonBox.button(QDialogButtonBox.Close).setDefault(True)
            
            self.resultList.header().resizeSections(
                QHeaderView.ResizeToContents)
            self.resultList.header().setStretchLastSection(True)
            if qVersion() >= "5.0.0":
                self.resultList.header().setSectionResizeMode(
                    QHeaderView.Interactive)
            else:
                self.resultList.header().setResizeMode(QHeaderView.Interactive)
            
            self.summaryLabel.setText(self.tr(
                "<table>"
                "<tr><td colspan=2><b>Summary:</b></td></tr>"
                "<tr><td><b>A</b></td><td align='right'>{0} files</td></tr>"
                "<tr><td><b>B</b></td><td align='right'>{1} files</td></tr>"
                "<tr><td><b>C</b></td><td align='right'>{2} files</td></tr>"
                "</table>"
            ).format(self.__locale.toString(self.__summary["A"]),
                     self.__locale.toString(self.__summary["B"]),
                     self.__locale.toString(self.__summary["C"]))
            )
            
            self.checkProgress.setVisible(False)
            self.checkProgressLabel.setVisible(False)
    
    @pyqtSlot(QAbstractButton)
    def on_buttonBox_clicked(self, button):
        """
        Private slot called by a button of the button box clicked.
        
        @param button button that was clicked
        @type QAbstractButton
        """
        if button == self.buttonBox.button(QDialogButtonBox.Close):
            self.close()
        elif button == self.buttonBox.button(QDialogButtonBox.Cancel):
            if self.__batch:
                self.radonService.cancelMaintainabilityIndexBatch()
                QTimer.singleShot(1000, self.__finish)
            else:
                self.__finish()
    
    @pyqtSlot()
    def on_startButton_clicked(self):
        """
        Private slot to start a maintainability index run.
        """
        fileList = self.__fileList[:]
        
        filterString = self.excludeFilesEdit.text()
        if (
            "ExcludeFiles" not in self.__data or
            filterString != self.__data["ExcludeFiles"]
        ):
            self.__data["ExcludeFiles"] = filterString
            self.__project.setData(
                "OTHERTOOLSPARMS", "RadonCodeMetrics", self.__data)
        filterList = [f.strip() for f in filterString.split(",")
                      if f.strip()]
        if filterList:
            for fileFilter in filterList:
                fileList = [f for f in fileList
                            if not fnmatch.fnmatch(f, fileFilter)]
        
        self.start(fileList)
    
    def clear(self):
        """
        Public method to clear all results.
        """
        self.resultList.clear()
        self.summaryLabel.clear()
    
    @pyqtSlot(QTreeWidgetItem, int)
    def on_resultList_itemActivated(self, item, column):
        """
        Private slot to handle the activation of a result item.
        
        @param item reference to the activated item
        @type QTreeWidgetItem
        @param column activated column
        @type int
        """
        filename = item.data(0, self.FilePathRole)
        if filename:
            vm = e5App().getObject("ViewManager")
            vm.openSourceFile(filename)