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

# Copyright (c) 2011 - 2018 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the editor assembly widget containing the navigation
combos and the editor widget.
"""

from __future__ import unicode_literals

from PyQt5.QtCore import QTimer
from PyQt5.QtWidgets import QWidget, QGridLayout, QComboBox

import UI.PixmapCache


class EditorAssembly(QWidget):
    """
    Class implementing the editor assembly widget containing the navigation
    combos and the editor widget.
    """
    def __init__(self, dbs, fn="", vm=None, filetype="", editor=None,
                 tv=None):
        """
        Constructor
        
        @param dbs reference to the debug server object
        @param fn name of the file to be opened (string). If it is None,
            a new (empty) editor is opened
        @param vm reference to the view manager object
            (ViewManager.ViewManager)
        @param filetype type of the source file (string)
        @param editor reference to an Editor object, if this is a cloned view
        @param tv reference to the task viewer object
        """
        super(EditorAssembly, self).__init__()
        
        self.__layout = QGridLayout(self)
        self.__layout.setContentsMargins(0, 0, 0, 0)
        self.__layout.setSpacing(1)
        
        from .EditorButtonsWidget import EditorButtonsWidget
        from .Editor import Editor
        
        self.__editor = Editor(dbs, fn, vm, filetype, editor, tv)
        self.__buttonsWidget = EditorButtonsWidget(self.__editor, self)
        self.__globalsCombo = QComboBox()
        self.__membersCombo = QComboBox()
        
        self.__layout.addWidget(self.__buttonsWidget, 1, 0, -1, 1)
        self.__layout.addWidget(self.__globalsCombo, 0, 1)
        self.__layout.addWidget(self.__membersCombo, 0, 2)
        self.__layout.addWidget(self.__editor, 1, 1, 1, -1)
        
        self.__module = None
        
        self.__globalsCombo.activated[int].connect(self.__globalsActivated)
        self.__membersCombo.activated[int].connect(self.__membersActivated)
        self.__editor.cursorLineChanged.connect(self.__editorCursorLineChanged)
        
        self.__parseTimer = QTimer(self)
        self.__parseTimer.setSingleShot(True)
        self.__parseTimer.setInterval(5 * 1000)
        self.__parseTimer.timeout.connect(self.__parseEditor)
        self.__editor.textChanged.connect(self.__resetParseTimer)
        self.__editor.refreshed.connect(self.__resetParseTimer)
        
        self.__selectedGlobal = ""
        self.__selectedMember = ""
        self.__globalsBoundaries = {}
        self.__membersBoundaries = {}
        
        QTimer.singleShot(0, self.__parseEditor)
    
    def shutdownTimer(self):
        """
        Public method to stop and disconnect the timer.
        """
        self.__parseTimer.stop()
        self.__parseTimer.timeout.disconnect(self.__parseEditor)
        self.__editor.textChanged.disconnect(self.__resetParseTimer)
        self.__editor.refreshed.disconnect(self.__resetParseTimer)
    
    def getEditor(self):
        """
        Public method to get the reference to the editor widget.
        
        @return reference to the editor widget (Editor)
        """
        return self.__editor
    
    def __globalsActivated(self, index, moveCursor=True):
        """
        Private method to jump to the line of the selected global entry and to
        populate the members combo box.
        
        @param index index of the selected entry (integer)
        @keyparam moveCursor flag indicating to move the editor cursor
            (boolean)
        """
        # step 1: go to the line of the selected entry
        lineno = self.__globalsCombo.itemData(index)
        if lineno is not None:
            if moveCursor:
                txt = self.__editor.text(lineno - 1).rstrip()
                pos = len(txt.replace(txt.strip(), ""))
                self.__editor.gotoLine(
                    lineno, pos if pos == 0 else pos + 1, True)
                self.__editor.setFocus()
            
            # step 2: populate the members combo, if the entry is a class
            self.__membersCombo.clear()
            self.__membersBoundaries = {}
            self.__membersCombo.addItem("")
            memberIndex = 0
            entryName = self.__globalsCombo.itemText(index)
            if self.__module:
                if entryName in self.__module.classes:
                    entry = self.__module.classes[entryName]
                elif entryName in self.__module.modules:
                    entry = self.__module.modules[entryName]
                    # step 2.0: add module classes
                    items = {}
                    for cl in entry.classes.values():
                        if cl.isPrivate():
                            icon = UI.PixmapCache.getIcon("class_private.png")
                        elif cl.isProtected():
                            icon = UI.PixmapCache.getIcon(
                                "class_protected.png")
                        else:
                            icon = UI.PixmapCache.getIcon("class.png")
                        items[cl.name] = (icon, cl.lineno, cl.endlineno)
                    for key in sorted(items.keys()):
                        itm = items[key]
                        self.__membersCombo.addItem(itm[0], key, itm[1])
                        memberIndex += 1
                        self.__membersBoundaries[(itm[1], itm[2])] = \
                            memberIndex
                else:
                    return
                
                # step 2.1: add class methods
                from Utilities.ModuleParser import Function
                items = {}
                for meth in entry.methods.values():
                    if meth.modifier == Function.Static:
                        icon = UI.PixmapCache.getIcon("method_static.png")
                    elif meth.modifier == Function.Class:
                        icon = UI.PixmapCache.getIcon("method_class.png")
                    elif meth.isPrivate():
                        icon = UI.PixmapCache.getIcon("method_private.png")
                    elif meth.isProtected():
                        icon = UI.PixmapCache.getIcon("method_protected.png")
                    else:
                        icon = UI.PixmapCache.getIcon("method.png")
                    items[meth.name] = (icon, meth.lineno, meth.endlineno)
                for key in sorted(items.keys()):
                    itm = items[key]
                    self.__membersCombo.addItem(itm[0], key, itm[1])
                    memberIndex += 1
                    self.__membersBoundaries[(itm[1], itm[2])] = memberIndex
                
                # step 2.2: add class instance attributes
                items = {}
                for attr in entry.attributes.values():
                    if attr.isPrivate():
                        icon = UI.PixmapCache.getIcon("attribute_private.png")
                    elif attr.isProtected():
                        icon = UI.PixmapCache.getIcon(
                            "attribute_protected.png")
                    else:
                        icon = UI.PixmapCache.getIcon("attribute.png")
                    items[attr.name] = (icon, attr.lineno)
                for key in sorted(items.keys()):
                    itm = items[key]
                    self.__membersCombo.addItem(itm[0], key, itm[1])
                
                # step 2.3: add class attributes
                items = {}
                icon = UI.PixmapCache.getIcon("attribute_class.png")
                for glob in entry.globals.values():
                    items[glob.name] = (icon, glob.lineno)
                for key in sorted(items.keys()):
                    itm = items[key]
                    self.__membersCombo.addItem(itm[0], key, itm[1])
    
    def __membersActivated(self, index, moveCursor=True):
        """
        Private method to jump to the line of the selected members entry.
        
        @param index index of the selected entry (integer)
        @keyparam moveCursor flag indicating to move the editor cursor
            (boolean)
        """
        lineno = self.__membersCombo.itemData(index)
        if lineno is not None and moveCursor:
            txt = self.__editor.text(lineno - 1).rstrip()
            pos = len(txt.replace(txt.strip(), ""))
            self.__editor.gotoLine(lineno, pos if pos == 0 else pos + 1, True)
            self.__editor.setFocus()
    
    def __resetParseTimer(self):
        """
        Private slot to reset the parse timer.
        """
        self.__parseTimer.stop()
        self.__parseTimer.start()
    
    def __parseEditor(self):
        """
        Private method to parse the editor source and repopulate the globals
        combo.
        """
        from Utilities.ModuleParser import Module, getTypeFromTypeName
        
        self.__module = None
        sourceType = getTypeFromTypeName(self.__editor.determineFileType())
        if sourceType != -1:
            src = self.__editor.text()
            if src:
                fn = self.__editor.getFileName()
                if fn is None:
                    fn = ""
                self.__module = Module("", fn, sourceType)
                self.__module.scan(src)
                
                # remember the current selections
                self.__selectedGlobal = self.__globalsCombo.currentText()
                self.__selectedMember = self.__membersCombo.currentText()
                
                self.__globalsCombo.clear()
                self.__membersCombo.clear()
                self.__globalsBoundaries = {}
                self.__membersBoundaries = {}
                
                self.__globalsCombo.addItem("")
                index = 0
                
                # step 1: add modules
                items = {}
                for module in self.__module.modules.values():
                    items[module.name] = (UI.PixmapCache.getIcon("module.png"),
                                          module.lineno, module.endlineno)
                for key in sorted(items.keys()):
                    itm = items[key]
                    self.__globalsCombo.addItem(itm[0], key, itm[1])
                    index += 1
                    self.__globalsBoundaries[(itm[1], itm[2])] = index
                
                # step 2: add classes
                items = {}
                for cl in self.__module.classes.values():
                    if cl.isPrivate():
                        icon = UI.PixmapCache.getIcon("class_private.png")
                    elif cl.isProtected():
                        icon = UI.PixmapCache.getIcon("class_protected.png")
                    else:
                        icon = UI.PixmapCache.getIcon("class.png")
                    items[cl.name] = (icon, cl.lineno, cl.endlineno)
                for key in sorted(items.keys()):
                    itm = items[key]
                    self.__globalsCombo.addItem(itm[0], key, itm[1])
                    index += 1
                    self.__globalsBoundaries[(itm[1], itm[2])] = index
                
                # step 3: add functions
                items = {}
                for func in self.__module.functions.values():
                    if func.isPrivate():
                        icon = UI.PixmapCache.getIcon("method_private.png")
                    elif func.isProtected():
                        icon = UI.PixmapCache.getIcon("method_protected.png")
                    else:
                        icon = UI.PixmapCache.getIcon("method.png")
                    items[func.name] = (icon, func.lineno, func.endlineno)
                for key in sorted(items.keys()):
                    itm = items[key]
                    self.__globalsCombo.addItem(itm[0], key, itm[1])
                    index += 1
                    self.__globalsBoundaries[(itm[1], itm[2])] = index
                
                # step 4: add attributes
                items = {}
                for glob in self.__module.globals.values():
                    if glob.isPrivate():
                        icon = UI.PixmapCache.getIcon("attribute_private.png")
                    elif glob.isProtected():
                        icon = UI.PixmapCache.getIcon(
                            "attribute_protected.png")
                    else:
                        icon = UI.PixmapCache.getIcon("attribute.png")
                    items[glob.name] = (icon, glob.lineno)
                for key in sorted(items.keys()):
                    itm = items[key]
                    self.__globalsCombo.addItem(itm[0], key, itm[1])
                
                # reset the currently selected entries without moving the
                # text cursor
                index = self.__globalsCombo.findText(self.__selectedGlobal)
                if index != -1:
                    self.__globalsCombo.setCurrentIndex(index)
                    self.__globalsActivated(index, moveCursor=False)
                index = self.__membersCombo.findText(self.__selectedMember)
                if index != -1:
                    self.__membersCombo.setCurrentIndex(index)
                    self.__membersActivated(index, moveCursor=False)
    
    def __editorCursorLineChanged(self, lineno):
        """
        Private slot handling a line change of the cursor of the editor.
        
        @param lineno line number of the cursor (integer)
        """
        lineno += 1     # cursor position is zero based, code info one based
        
        # step 1: search in the globals
        for (lower, upper), index in self.__globalsBoundaries.items():
            if upper == -1:
                upper = 1000000     # it is the last line
            if lower <= lineno <= upper:
                break
        else:
            index = 0
        self.__globalsCombo.setCurrentIndex(index)
        self.__globalsActivated(index, moveCursor=False)
        
        # step 2: search in members
        for (lower, upper), index in self.__membersBoundaries.items():
            if upper == -1:
                upper = 1000000     # it is the last line
            if lower <= lineno <= upper:
                break
        else:
            index = 0
        self.__membersCombo.setCurrentIndex(index)
        self.__membersActivated(index, moveCursor=False)
