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

# Copyright (c) 2007 - 2022 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing an UML like class item.
"""

from PyQt6.QtCore import QCoreApplication
from PyQt6.QtGui import QFont
from PyQt6.QtWidgets import QGraphicsSimpleTextItem, QStyle

from .UMLItem import UMLModel, UMLItem

import Utilities


class ClassModel(UMLModel):
    """
    Class implementing the class model.
    """
    def __init__(self, name, methods=None, instanceAttributes=None,
                 classAttributes=None):
        """
        Constructor
        
        @param name the class name
        @type str
        @param methods list of method names of the class
        @type list of str
        @param instanceAttributes list of instance attribute names of the class
        @type list of str
        @param classAttributes list of class attribute names of the class
        @type list of str
        """
        super().__init__(name)
        
        self.methods = [] if methods is None else methods[:]
        self.instanceAttributes = (
            []
            if instanceAttributes is None else
            instanceAttributes[:]
        )
        self.classAttributes = (
            []
            if classAttributes is None else
            classAttributes[:]
        )
    
    def addMethod(self, method):
        """
        Public method to add a method to the class model.
        
        @param method method name to be added
        @type str
        """
        self.methods.append(method)
    
    def addInstanceAttribute(self, attribute):
        """
        Public method to add an instance attribute to the class model.
        
        @param attribute instance attribute name to be added
        @type str
        """
        self.instanceAttributes.append(attribute)
    
    def addClassAttribute(self, attribute):
        """
        Public method to add a class attribute to the class model.
        
        @param attribute class attribute name to be added
        @type str
        """
        self.classAttributes.append(attribute)
    
    def getMethods(self):
        """
        Public method to retrieve the methods of the class.
        
        @return list of class methods
        @rtype list of str
        """
        return self.methods[:]
    
    def getInstanceAttributes(self):
        """
        Public method to retrieve the attributes of the class.
        
        @return list of instance attributes
        @rtype list of str
        """
        return self.instanceAttributes[:]
    
    def getClassAttributes(self):
        """
        Public method to retrieve the global attributes of the class.
        
        @return list of class attributes
        @rtype list of str
        """
        return self.classAttributes[:]


class ClassItem(UMLItem):
    """
    Class implementing an UML like class item.
    """
    ItemType = "class"
    
    def __init__(self, model=None, external=False, x=0, y=0,
                 rounded=False, noAttrs=False, colors=None, parent=None,
                 scene=None):
        """
        Constructor
        
        @param model class model containing the class data
        @type ClassModel
        @param external flag indicating a class defined outside our scope
        @type boolean
        @param x x-coordinate
        @type int
        @param y y-coordinate
        @type int
        @param rounded flag indicating a rounded corner
        @type bool
        @param noAttrs flag indicating, that no attributes should be shown
        @type bool
        @param colors tuple containing the foreground and background colors
        @type tuple of (QColor, QColor)
        @param parent reference to the parent object
        @type QGraphicsItem
        @param scene reference to the scene object
        @type QGraphicsScene
        """
        UMLItem.__init__(self, model, x, y, rounded, colors, parent)
        
        self.external = external
        self.noAttrs = noAttrs
        
        if scene:
            scene.addItem(self)
        
        if self.model:
            self.__createTexts()
            self.__calculateSize()
        
    def __createTexts(self):
        """
        Private method to create the text items of the class item.
        """
        if self.model is None:
            return
        
        boldFont = QFont(self.font)
        boldFont.setBold(True)
        boldFont.setUnderline(True)
        
        classAttributes = self.model.getClassAttributes()
        attrs = self.model.getInstanceAttributes()
        meths = self.model.getMethods()
        
        x = self.margin + int(self.rect().x())
        y = self.margin + int(self.rect().y())
        self.header = QGraphicsSimpleTextItem(self)
        self.header.setBrush(self._colors[0])
        self.header.setFont(boldFont)
        self.header.setText(self.model.getName())
        self.header.setPos(x, y)
        y += int(self.header.boundingRect().height()) + self.margin
        
        if self.external:
            self.classAttributes = None
        else:
            txt = QCoreApplication.translate(
                "ClassItem", "Class Attributes:\n  ")
            txt += (
                "\n  ".join(classAttributes)
                if globals else
                "  " + QCoreApplication.translate("ClassItem", "none")
            )
            self.classAttributes = QGraphicsSimpleTextItem(self)
            self.classAttributes.setBrush(self._colors[0])
            self.classAttributes.setFont(self.font)
            self.classAttributes.setText(txt)
            self.classAttributes.setPos(x, y)
            y += (int(self.classAttributes.boundingRect().height()) +
                  self.margin)
        
        if not self.noAttrs and not self.external:
            txt = QCoreApplication.translate(
                "ClassItem", "Instance Attributes:\n  ")
            txt += (
                "\n  ".join(attrs)
                if attrs else
                "  " + QCoreApplication.translate("ClassItem", "none")
            )
            self.attrs = QGraphicsSimpleTextItem(self)
            self.attrs.setBrush(self._colors[0])
            self.attrs.setFont(self.font)
            self.attrs.setText(txt)
            self.attrs.setPos(x, y)
            y += int(self.attrs.boundingRect().height()) + self.margin
        else:
            self.attrs = None
        
        if self.external:
            txt = " "
        else:
            txt = QCoreApplication.translate("ClassItem", "Methods:\n  ")
            txt += (
                "\n  ".join(meths)
                if meths else
                "  " + QCoreApplication.translate("ClassItem", "none")
            )
        self.meths = QGraphicsSimpleTextItem(self)
        self.meths.setBrush(self._colors[0])
        self.meths.setFont(self.font)
        self.meths.setText(txt)
        self.meths.setPos(x, y)
        
    def __calculateSize(self):
        """
        Private method to calculate the size of the class item.
        """
        if self.model is None:
            return
        
        width = int(self.header.boundingRect().width())
        height = int(self.header.boundingRect().height())
        if self.classAttributes:
            width = max(width,
                        int(self.classAttributes.boundingRect().width()))
            height += (
                int(self.classAttributes.boundingRect().height()) + self.margin
            )
        if self.attrs:
            width = max(width,
                        int(self.attrs.boundingRect().width()))
            height = (
                height + int(self.attrs.boundingRect().height()) + self.margin
            )
        if self.meths:
            width = max(width,
                        int(self.meths.boundingRect().width()))
            height += int(self.meths.boundingRect().height())
        
        self.setSize(width + 2 * self.margin, height + 2 * self.margin)
        
    def setModel(self, model):
        """
        Public method to set the class model.
        
        @param model class model containing the class data
        @type ClassModel
        """
        self.scene().removeItem(self.header)
        self.header = None
        if self.classAttributes:
            self.scene().removeItem(self.classAttributes)
            self.classAttributes = None
        if self.attrs:
            self.scene().removeItem(self.attrs)
            self.attrs = None
        if self.meths:
            self.scene().removeItem(self.meths)
            self.meths = None
        self.model = model
        self.__createTexts()
        self.__calculateSize()
        
    def paint(self, painter, option, widget=None):
        """
        Public method to paint the item in local coordinates.
        
        @param painter reference to the painter object
        @type QPainter
        @param option style options
        @type QStyleOptionGraphicsItem
        @param widget optional reference to the widget painted on
        @type QWidget
        """
        pen = self.pen()
        if (
            (option.state & QStyle.StateFlag.State_Selected) ==
            QStyle.StateFlag.State_Selected
        ):
            pen.setWidth(2)
        else:
            pen.setWidth(1)
        
        painter.setPen(pen)
        painter.setBrush(self.brush())
        painter.setFont(self.font)
        
        offsetX = int(self.rect().x())
        offsetY = int(self.rect().y())
        w = int(self.rect().width())
        h = int(self.rect().height())
        
        painter.drawRect(offsetX, offsetY, w, h)
        y = self.margin + int(self.header.boundingRect().height())
        painter.drawLine(offsetX, offsetY + y, offsetX + w - 1, offsetY + y)
        if self.classAttributes:
            y += (
                self.margin +
                int(self.classAttributes.boundingRect().height())
            )
            painter.drawLine(offsetX, offsetY + y,
                             offsetX + w - 1, offsetY + y)
        if self.attrs:
            y += self.margin + int(self.attrs.boundingRect().height())
            painter.drawLine(offsetX, offsetY + y,
                             offsetX + w - 1, offsetY + y)
        
        self.adjustAssociations()
        
    def isExternal(self):
        """
        Public method returning the external state.
        
        @return external state
        @rtype bool
        """
        return self.external
    
    def parseItemDataString(self, version, data):
        """
        Public method to parse the given persistence data.
        
        @param version version of the data
        @type str
        @param data persisted data to be parsed
        @type str
        @return flag indicating success
        @rtype bool
        """
        parts = data.split(", ")
        if len(parts) < 3:
            return False
        
        name = ""
        instanceAttributes = []
        methods = []
        classAttributes = []
        
        for part in parts:
            key, value = part.split("=", 1)
            if key == "is_external":
                self.external = Utilities.toBool(value.strip())
            elif key == "no_attributes":
                self.noAttrs = Utilities.toBool(value.strip())
            elif key == "name":
                name = value.strip()
            elif key == "attributes":
                instanceAttributes = value.strip().split("||")
            elif key == "methods":
                methods = value.strip().split("||")
            elif key == "class_attributes":
                classAttributes = value.strip().split("||")
            else:
                return False
        
        self.model = ClassModel(name, methods, instanceAttributes,
                                classAttributes)
        self.__createTexts()
        self.__calculateSize()
        
        return True
    
    def toDict(self):
        """
        Public method to collect data to be persisted.
        
        @return dictionary containing data to be persisted
        @rtype dict
        """
        return {
            "id": self.getId(),
            "x": self.x(),
            "y": self.y(),
            "type": self.getItemType(),
            "is_external": self.external,
            "no_attributes": self.noAttrs,
            "model_name": self.model.getName(),
            "attributes": self.model.getInstanceAttributes(),
            "methods": self.model.getMethods(),
            "class_attributes": self.model.getClassAttributes(),
        }
    
    @classmethod
    def fromDict(cls, data, colors=None):
        """
        Class method to create a class item from persisted data.
        
        @param data dictionary containing the persisted data as generated
            by toDict()
        @type dict
        @param colors tuple containing the foreground and background colors
        @type tuple of (QColor, QColor)
        @return created class item
        @rtype ClassItem
        """
        try:
            model = ClassModel(data["model_name"],
                               data["methods"],
                               data["attributes"],
                               data["class_attributes"])
            itm = cls(model=model,
                      external=data["is_external"],
                      x=0,
                      y=0,
                      noAttrs=data["no_attributes"],
                      colors=colors)
            itm.setPos(data["x"], data["y"])
            itm.setId(data["id"])
            return itm
        except KeyError:
            return None
