TimeTracker/TimeTracker.py

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

# Copyright (c) 2012 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the time tracker object.
"""

import os

from PyQt4.QtCore import QObject

from E5Gui.E5Application import e5App
from E5Gui import E5MessageBox

from .TimeTrackEntry import TimeTrackEntry
from .TimeTrackerWidget import TimeTrackerWidget

import UI.PixmapCache


class TimeTracker(QObject):
    """
    Class implementing the time tracker object.
    """
    FileName = "TimeTracker.txt"
    
    def __init__(self, plugin, parent=None):
        """
        Constructor
        
        @param plugin reference to the plugin object
        @param parent parent (QObject)
        """
        QObject.__init__(self, parent)
        
        self.__plugin = plugin
        self.__ui = parent
        
        self.__e5project = e5App().getObject("Project")
        
        self.__widget = TimeTrackerWidget(self)
        self.__ui.addSideWidget(self.__ui.BottomSide, self.__widget,
            UI.PixmapCache.getIcon(os.path.join("TimeTracker", "icons", "clock.png")),
            self.tr("Time Tracker"))
        
        self.__initialize()
    
    def __initialize(self):
        """
        Public slot to initialize some member variables.
        """
        self.__projectPath = ''
        self.__trackerFilePath = ''
        self.__projectOpen = False
        
        self.__entries = {}         # key: entry ID, value tracker entry
        self.__currentEntry = None
        
        self.__widget.clear()
    
    def projectOpened(self):
        """
        Public slot to handle the projectOpened signal.
        """
        if self.__projectOpen:
            self.projectClosed()
        
        self.__projectOpen = True
        self.__projectPath = self.__e5project.getProjectPath()
        self.__trackerFilePath = os.path.join(
            self.__e5project.getProjectManagementDir(),
            TimeTracker.FileName)
        
        self.__readTrackerEntries()
        self.__widget.showTrackerEntries(sorted(self.__entries.values(), reverse=True))
        
        self.startTrackerEntry()
    
    def projectClosed(self):
        """
        Public slot to handle the projectClosed signal.
        """
        self.stopTrackerEntry()
        self.saveTrackerEntries()
        self.__initialize()
    
    def __readTrackerEntries(self):
        """
        Private slot to read the time tracker entries from a file.
        """
        if os.path.exists(self.__trackerFilePath):
            try:
                f = open(self.__trackerFilePath, "r", encoding="utf-8")
                data = f.read()
                f.close()
            except (IOError, OSError) as err:
                E5MessageBox.critical(self.__ui,
                    self.trUtf8("Read Time Tracker File"),
                    self.trUtf8("""<p>The time tracker file <b>{0}</b> could not be"""
                                """ read.</p><p>Reason: {1}</p>""").format(
                        self.__trackerFilePath, str(err)))
                return
            
            invalidCount = 0
            for line in data.splitlines():
                entry = TimeTrackEntry()
                eid = entry.fromString(line.strip())
                if eid > -1:
                    self.__entries[eid] = entry
                else:
                    invalidCount += 1
            
            if invalidCount:
                E5MessageBox.information(self.__ui,
                    self.trUtf8("Read Time Tracker File"),
                    self.trUtf8("""<p>The time tracker file <b>{0}</b> contained"""
                                """ %n invalid entries. These have been discarded.""",
                                "", invalidCount).format(self.__trackerFilePath))
    
    def saveTrackerEntries(self):
        """
        Public slot to save the tracker entries to a file.
        """
        try:
            f = open(self.__trackerFilePath, "w", encoding="utf-8")
            for entry in self.__entries.values():
                if entry.isValid():
                    f.write(entry.toString() + "\n")
            f.close()
        except (IOError, OSError) as err:
            E5MessageBox.critical(self.__ui,
                self.trUtf8("Save Time Tracker File"),
                self.trUtf8("""<p>The time tracker file <b>{0}</b> could not be"""
                            """ saved.</p><p>Reason: {1}</p>""").format(
                    self.__trackerFilePath, str(err)))
    
    def pauseTrackerEntry(self):
        """
        Public method to pause the current tracker entry.
        """
        self.__currentEntry.pause()
    
    def continueTrackerEntry(self):
        """
        Public method to continue the current tracker entry.
        """
        self.__currentEntry.continue_()
    
    def stopTrackerEntry(self):
        """
        Public method to stop the current tracker entry.
        
        @return tuple of the ID assigned to the stopped tracker entry and
            the duration (integer, integer)
        """
        duration = 0
        nextID = -1
        if self.__currentEntry is not None:
            self.__currentEntry.stop()
            if self.__currentEntry.isValid():
                if len(self.__entries.keys()):
                    nextID = max(self.__entries.keys()) + 1
                else:
                    nextID = 0
                self.__currentEntry.setID(nextID)
                self.__entries[nextID] = self.__currentEntry
                duration = self.__currentEntry.getDuration()
            self.__currentEntry = None
        
        return nextID, duration
    
    def startTrackerEntry(self):
        """
        Public method to start a new tracker entry.
        """
        self.__currentEntry = TimeTrackEntry()
        self.__currentEntry.start()
        self.__widget.setCurrentEntry(self.__currentEntry)
    
    def getCurrentEntry(self):
        """
        Public method to get a reference to the current tracker entry.
        """
        return self.__currentEntry
    
    def deleteTrackerEntry(self, eid):
        """
        Public method to delete a tracker entry given its ID.
        
        @param eid ID of the tracker entry (integer)
        """
        if eid in self.__entries:
            del self.__entries[eid]