#!/usr/bin/env python
# Unit Name: 
# Created By: Virgil Dupras
# Created On: 2009-04-23
# $Id$
# Copyright 2009 Hardcoded Software (http://www.hardcoded.net)

from PyQt4.QtCore import SIGNAL, Qt, QAbstractItemModel, QVariant, QModelIndex, QRect
from PyQt4.QtGui import QBrush, QStyledItemDelegate, QFont, QTreeView, QColor

from tree_model import TreeNode, TreeModel

class ResultNode(TreeNode):
    def __init__(self, model, parent, row, dupe, group):
        TreeNode.__init__(self, parent, row)
        self.model = model
        self.dupe = dupe
        self.group = group
        self._normalData = None
        self._deltaData = None
    
    def _get_children(self):
        children = []
        if self.dupe is self.group.ref:
            for index, dupe in enumerate(self.group.dupes):
                children.append(ResultNode(self.model, self, index, dupe, self.group))
        return children
    
    def reset(self):
        self._normalData = None
        self._deltaData = None
    
    @property
    def normalData(self):
        if self._normalData is None:
            self._normalData = self.model._data.GetDisplayInfo(self.dupe, self.group, delta=False)
        return self._normalData
    
    @property
    def deltaData(self):
        if self._deltaData is None:
            self._deltaData = self.model._data.GetDisplayInfo(self.dupe, self.group, delta=True)
        return self._deltaData
    

class ResultsDelegate(QStyledItemDelegate):
    def initStyleOption(self, option, index):
        QStyledItemDelegate.initStyleOption(self, option, index)
        node = index.internalPointer()
        if node.group.ref is node.dupe:
            newfont = QFont(option.font)
            newfont.setBold(True)
            option.font = newfont
    

class ResultsModel(TreeModel):
    def __init__(self, app):
        self._app = app
        self._results = app.results
        self._data = app.data
        self._delta_columns = app.DELTA_COLUMNS
        self.delta = False
        self._power_marker = False
        TreeModel.__init__(self)
    
    def _root_nodes(self):
        nodes = []
        if self.power_marker:
            for index, dupe in enumerate(self._results.dupes):
                group = self._results.get_group_of_duplicate(dupe)
                nodes.append(ResultNode(self, None, index, dupe, group))
        else:
            for index, group in enumerate(self._results.groups):
                nodes.append(ResultNode(self, None, index, group.ref, group))
        return nodes
    
    def columnCount(self, parent):
        return len(self._data.COLUMNS)
    
    def data(self, index, role):
        if not index.isValid():
            return QVariant()
        node = index.internalPointer()
        if role == Qt.DisplayRole:
            data = node.deltaData if self.delta else node.normalData
            return QVariant(data[index.column()])
        elif role == Qt.CheckStateRole:
            if index.column() == 0 and node.dupe is not node.group.ref:
                state = Qt.Checked if self._results.is_marked(node.dupe) else Qt.Unchecked
                return QVariant(state)
        elif role == Qt.ForegroundRole:
            if node.dupe is node.group.ref or node.dupe.is_ref:
                return QVariant(QBrush(Qt.blue))
            elif self.delta and index.column() in self._delta_columns:
                return QVariant(QBrush(QColor(255, 142, 40))) # orange
        elif role == Qt.EditRole:
            if index.column() == 0:
                return QVariant(node.normalData[index.column()])
        return QVariant()
    
    def dupesForIndexes(self, indexes):
        nodes = [index.internalPointer() for index in indexes]
        return [node.dupe for node in nodes]
    
    def flags(self, index):
        if not index.isValid():
            return Qt.ItemIsEnabled
        flags = Qt.ItemIsEnabled | Qt.ItemIsSelectable
        if index.column() == 0:
            flags |= Qt.ItemIsUserCheckable | Qt.ItemIsEditable
        return flags
    
    def headerData(self, section, orientation, role):
        if orientation == Qt.Horizontal and role == Qt.DisplayRole and section < len(self._data.COLUMNS):
            return QVariant(self._data.COLUMNS[section]['display'])
        
        return QVariant()
    
    def setData(self, index, value, role):
        if not index.isValid():
            return False
        node = index.internalPointer()
        if role == Qt.CheckStateRole:
            if index.column() == 0:
                self._app.toggle_marking_for_dupes([node.dupe])
                return True
        if role == Qt.EditRole:
            if index.column() == 0:
                value = unicode(value.toString())
                if self._app.rename_dupe(node.dupe, value):
                    node.reset()
                    return True
        return False
    
    def sort(self, column, order):
        if self.power_marker:
            self._results.sort_dupes(column, order == Qt.AscendingOrder, self.delta)
        else:
            self._results.sort_groups(column, order == Qt.AscendingOrder)
        self.reset()
    
    def toggleMarked(self, indexes):
        assert indexes
        dupes = self.dupesForIndexes(indexes)
        self._app.toggle_marking_for_dupes(dupes)
    
    #--- Properties
    @property
    def power_marker(self):
        return self._power_marker
    
    @power_marker.setter
    def power_marker(self, value):
        if value == self._power_marker:
            return
        self._power_marker = value
        self.reset()
    

class ResultsView(QTreeView):
    #--- Override
    def keyPressEvent(self, event):
        if event.text() == ' ':
            self.model().toggleMarked(self.selectionModel().selectedRows())
            return
        QTreeView.keyPressEvent(self, event)
    
    def setModel(self, model):
        assert isinstance(model, ResultsModel)
        QTreeView.setModel(self, model)
    
    #--- Public
    def selectedDupes(self):
        return self.model().dupesForIndexes(self.selectionModel().selectedRows())