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

# Copyright (c) 2007 - 2020 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog showing an imports diagram of the application.
"""


import os
import glob

from PyQt5.QtWidgets import QApplication

from E5Gui import E5MessageBox
from E5Gui.E5ProgressDialog import E5ProgressDialog

from .UMLDiagramBuilder import UMLDiagramBuilder

import Utilities
import Preferences


class ApplicationDiagramBuilder(UMLDiagramBuilder):
    """
    Class implementing a builder for imports diagrams of the application.
    """
    def __init__(self, dialog, view, project, noModules=False):
        """
        Constructor
        
        @param dialog reference to the UML dialog (UMLDialog)
        @param view reference to the view object (UMLGraphicsView)
        @param project reference to the project object (Project)
        @keyparam noModules flag indicating, that no module names should be
            shown (boolean)
        """
        super(ApplicationDiagramBuilder, self).__init__(dialog, view, project)
        self.setObjectName("ApplicationDiagram")
        
        self.noModules = noModules
        
        self.umlView.setDiagramName(
            self.tr("Application Diagram {0}").format(
                self.project.getProjectName()))
        
    def __buildModulesDict(self):
        """
        Private method to build a dictionary of modules contained in the
        application.
        
        @return dictionary of modules contained in the application.
        """
        import Utilities.ModuleParser
        extensions = (
            Preferences.getPython("PythonExtensions") +
            Preferences.getPython("Python3Extensions") +
            ['.rb']
        )
        moduleDict = {}
        mods = self.project.pdata["SOURCES"]
        modules = []
        for module in mods:
            modules.append(Utilities.normabsjoinpath(
                self.project.ppath, module))
        tot = len(modules)
        progress = E5ProgressDialog(
            self.tr("Parsing modules..."),
            None, 0, tot, self.tr("%v/%m Modules"), self.parent())
        progress.setWindowTitle(self.tr("Application Diagram"))
        try:
            prog = 0
            progress.show()
            QApplication.processEvents()
            
            for module in modules:
                progress.setValue(prog)
                QApplication.processEvents()
                prog += 1
                if module.endswith("__init__.py"):
                    continue
                try:
                    mod = Utilities.ModuleParser.readModule(
                        module, extensions=extensions, caching=False)
                except ImportError:
                    continue
                else:
                    name = mod.name
                    moduleDict[name] = mod
        finally:
            progress.setValue(tot)
            progress.deleteLater()
        return moduleDict
        
    def buildDiagram(self):
        """
        Public method to build the packages shapes of the diagram.
        """
        project = (
            os.path.splitdrive(self.project.getProjectPath())[1]
            .replace(os.sep, '.')[1:]
        )
        packages = {}
        shapes = {}
        p = 10
        y = 10
        maxHeight = 0
        sceneRect = self.umlView.sceneRect()
        
        modules = self.__buildModulesDict()
        sortedkeys = sorted(modules.keys())
        
        # step 1: build a dictionary of packages
        for module in sortedkeys:
            li = module.split('.')
            package = '.'.join(li[:-1])
            if package in packages:
                packages[package][0].append(li[-1])
            else:
                packages[package] = ([li[-1]], [])
                
        # step 2: assign modules to dictionaries and update import relationship
        for module in sortedkeys:
            li = module.split('.')
            package = '.'.join(li[:-1])
            impLst = []
            for i in modules[module].imports:
                if i in modules:
                    impLst.append(i)
                else:
                    if i.find('.') == -1:
                        n = "{0}.{1}".format(modules[module].package, i)
                        if n in modules:
                            impLst.append(n)
                        else:
                            n = "{0}.{1}".format(project, i)
                            if n in modules:
                                impLst.append(n)
                            elif n in packages:
                                n = "{0}.<<Dummy>>".format(n)
                                impLst.append(n)
                    else:
                        n = "{0}.{1}".format(project, i)
                        if n in modules:
                            impLst.append(n)
            for i in list(modules[module].from_imports.keys()):
                if i.startswith('.'):
                    dots = len(i) - len(i.lstrip('.'))
                    if dots == 1:
                        i = i[1:]
                    elif dots > 1:
                        packagePath = os.path.dirname(modules[module].file)
                        hasInit = True
                        ppath = packagePath
                        while hasInit:
                            ppath = os.path.dirname(ppath)
                            hasInit = len(glob.glob(os.path.join(
                                ppath, '__init__.*'))) > 0
                        shortPackage = (
                            packagePath.replace(ppath, '')
                            .replace(os.sep, '.')[1:]
                        )
                        packageList = shortPackage.split('.')[1:]
                        packageListLen = len(packageList)
                        i = '.'.join(
                            packageList[:packageListLen - dots + 1] +
                            [i[dots:]])
                
                if i in modules:
                    impLst.append(i)
                else:
                    if i.find('.') == -1:
                        n = "{0}.{1}".format(modules[module].package, i)
                        if n in modules:
                            impLst.append(n)
                        else:
                            n = "{0}.{1}".format(project, i)
                            if n in modules:
                                impLst.append(n)
                            elif n in packages:
                                n = "{0}.<<Dummy>>".format(n)
                                impLst.append(n)
                    else:
                        n = "{0}.{1}".format(project, i)
                        if n in modules:
                            impLst.append(n)
            for imp in impLst:
                impPackage = '.'.join(imp.split('.')[:-1])
                if (
                    impPackage not in packages[package][1] and
                    not impPackage == package
                ):
                    packages[package][1].append(impPackage)
                    
        sortedkeys = sorted(packages.keys())
        for package in sortedkeys:
            if package:
                relPackage = package.replace(project, '')
                if relPackage and relPackage[0] == '.':
                    relPackage = relPackage[1:]
                else:
                    relPackage = self.tr("<<Application>>")
            else:
                relPackage = self.tr("<<Others>>")
            shape = self.__addPackage(
                relPackage, packages[package][0], 0.0, 0.0)
            shapeRect = shape.sceneBoundingRect()
            shapes[package] = (shape, packages[package][1])
            pn = p + shapeRect.width() + 10
            maxHeight = max(maxHeight, shapeRect.height())
            if pn > sceneRect.width():
                p = 10
                y += maxHeight + 10
                maxHeight = shapeRect.height()
                shape.setPos(p, y)
                p += shapeRect.width() + 10
            else:
                shape.setPos(p, y)
                p = pn
        
        rect = self.umlView._getDiagramRect(10)
        sceneRect = self.umlView.sceneRect()
        if rect.width() > sceneRect.width():
            sceneRect.setWidth(rect.width())
        if rect.height() > sceneRect.height():
            sceneRect.setHeight(rect.height())
        self.umlView.setSceneSize(sceneRect.width(), sceneRect.height())
        
        self.__createAssociations(shapes)
        self.umlView.autoAdjustSceneSize(limit=True)
        
    def __addPackage(self, name, modules, x, y):
        """
        Private method to add a package to the diagram.
        
        @param name package name to be shown (string)
        @param modules list of module names contained in the package
            (list of strings)
        @param x x-coordinate (float)
        @param y y-coordinate (float)
        @return reference to the package item (PackageItem)
        """
        from .PackageItem import PackageItem, PackageModel
        modules.sort()
        pm = PackageModel(name, modules)
        pw = PackageItem(pm, x, y, noModules=self.noModules, scene=self.scene)
        pw.setId(self.umlView.getItemId())
        return pw
        
    def __createAssociations(self, shapes):
        """
        Private method to generate the associations between the package shapes.
        
        @param shapes list of shapes
        """
        from .AssociationItem import AssociationItem, Imports
        for package in shapes:
            for rel in shapes[package][1]:
                assoc = AssociationItem(
                    shapes[package][0], shapes[rel][0],
                    Imports)
                self.scene.addItem(assoc)
    
    def getPersistenceData(self):
        """
        Public method to get a string for data to be persisted.
        
        @return persisted data string (string)
        """
        return "project={0}, no_modules={1}".format(
            self.project.getProjectFile(), self.noModules)
    
    def parsePersistenceData(self, version, data):
        """
        Public method to parse persisted data.
        
        @param version version of the data (string)
        @param data persisted data to be parsed (string)
        @return flag indicating success (boolean)
        """
        parts = data.split(", ")
        if (
            len(parts) != 2 or
            not parts[0].startswith("project=") or
            not parts[1].startswith("no_modules=")
        ):
            return False
        
        projectFile = parts[0].split("=", 1)[1].strip()
        if projectFile != self.project.getProjectFile():
            res = E5MessageBox.yesNo(
                None,
                self.tr("Load Diagram"),
                self.tr(
                    """<p>The diagram belongs to the project <b>{0}</b>."""
                    """ Shall this project be opened?</p>""").format(
                    projectFile))
            if res:
                self.project.openProject(projectFile)
            
        self.noModules = Utilities.toBool(parts[1].split("=", 1)[1].strip())
        
        self.initialize()
        
        return True
