import datetime
import os
import pickle
from PyQt4.QtCore import *
from PyQt4.QtGui import *

from sfa.util.record import SfaRecord, SliceRecord, AuthorityRecord
from sface.config import config
from sface.sfidata import SfiData

NAME_COLUMN = 0
MEMBERSHIP_STATUS_COLUMN = 1

# maximum length of a name to display before clipping
NAME_MAX_LEN = 48

slice_status = { "in": "Selected",
                "out": "Not Selected"}

color_status = { "in": QColor.fromRgb(0, 250, 250), }

class SliceNameDelegate(QStyledItemDelegate):
    def __init__(self, parent):
        QStyledItemDelegate.__init__(self, parent)

    def displayText(self, value, locale):
        data = str(QStyledItemDelegate.displayText(self, value, locale))
        if (len(data)>NAME_MAX_LEN):
            data = data[:(NAME_MAX_LEN-3)] + "..."
        return QString(data)

    def paint(self, painter, option, index):
        model = index.model()
        data = str(self.displayText(index.data(), QLocale()))
        status_index = model.index(index.row(), MEMBERSHIP_STATUS_COLUMN, index.parent())
        status_data = status_index.data().toString()

        fm = QFontMetrics(option.font)
        rect = QRect(option.rect)

        rect.setHeight(rect.height() - 2)
        rect.setWidth(fm.width(QString(data)) + 6)
        rect.setX(rect.x() + 5)
        rect.setY(rect.y() - 1)

        textRect = QRect(option.rect)
        textRect.setWidth(fm.width(QString(data)) + 6)
        textRect.setX(rect.x())

        x, y, h, w = rect.x(), rect.y(), rect.height(), rect.width()

        path = QPainterPath()
        path.addRoundedRect(x - 1, y + 1, w, h, 4, 4)

        painter.save()
        painter.setRenderHint(QPainter.Antialiasing)

        if option.state & QStyle.State_Selected:
            painter.fillRect(option.rect, option.palette.color(QPalette.Active, QPalette.Highlight))

        color = None
        for x in slice_status.keys():
            if (slice_status[x] == status_data) and (x in color_status):
                color = color_status[x]

        if color != None:
            painter.fillPath(path, color)
        painter.setPen(QColor.fromRgb(0, 0, 0))
        painter.drawText(textRect, Qt.AlignVCenter, QString(data))

        painter.restore()

class SliceView(QTableView):
    def __init__(self, parent=None):
        QTableView.__init__(self, parent)

        self.setSelectionBehavior(QAbstractItemView.SelectRows)
        self.setSelectionMode(QAbstractItemView.SingleSelection)
        self.setAlternatingRowColors(True)
        self.setAttribute(Qt.WA_MacShowFocusRect, 0)
        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
        self.setToolTip("Double click on a row to change its status.")

        self.setItemDelegateForColumn(0, SliceNameDelegate(self))

    def keyPressEvent(self, event):
        if (event.key() == Qt.Key_Space):
            self.toggleSelection()
        else:
            QTableView.keyPressEvent(self, event)

    def mouseDoubleClickEvent(self, event):
        self.toggleSelection()

    def toggleSelection(self):
        index = self.currentIndex()
        model = index.model()
        status_index = model.index(index.row(), MEMBERSHIP_STATUS_COLUMN, index.parent())
        status_data = status_index.data().toString()
        node_index = model.index(index.row(), NAME_COLUMN, index.parent())
        node_data = node_index.data().toString()

        if status_data == slice_status['in']:
            model.setData(status_index, QString(slice_status['out']))
        else:
            model.setData(status_index, QString(slice_status['in']))

        model.emit(SIGNAL("dataChanged(QModelIndex, QModelIndex)"), node_index, node_index)

    def currentChanged(self, current, previous):
        model = current.model()
        node_index = model.index(current.row(), 0, current.parent())
        node_data = node_index.data().toString()

MODE_AUTHORITY_SLICES = 1
MODE_USER_SLICES = 2

class SliceModel(QStandardItemModel):
    def __init__(self, rows=0, columns=4, parent=None, mode=MODE_AUTHORITY_SLICES):
         QStandardItemModel.__init__(self, rows, columns, parent)
         self.mode = mode

    def updateModel(self):
        self.clear()

        if (self.mode == MODE_AUTHORITY_SLICES):
            slice_names = SfiData().getAuthorityHrns(type="slice")
        else: # MODE_USER_SLICES
            slice_names = SfiData().getUserSliceHrns()

        rootItem = self.invisibleRootItem()

        for name in slice_names:
            rootItem.appendRow([self.readOnlyItem(name),
                                self.readOnlyItem(slice_status["out"])])

        headers = QStringList() << "Slice Name" << "Status"
        self.setHorizontalHeaderLabels(headers)

    def readOnlyItem(self, x):
        item = QStandardItem(QString(x))
        item.setFlags(Qt.ItemIsSelectable | Qt.ItemIsEnabled)
        return item

    def getSelectedSlices(self):
        slices = []
        item = self.invisibleRootItem()
        children = item.rowCount()
        for row in range(0, children):
            childName = str(item.child(row, NAME_COLUMN).data(Qt.DisplayRole).toString())
            childStatus = str(item.child(row, MEMBERSHIP_STATUS_COLUMN).data(Qt.DisplayRole).toString())

            if (childStatus == slice_status['in']):
                slices.append(childName)

        return slices

class SlicePickerWindow(QDialog):
    def __init__(self, parent=None):
        super(SlicePickerWindow, self).__init__(parent)
        self.setWindowTitle("Slice Picker")

        sliceLabel = QLabel("Slices:")
        self.sliceView = SliceView()

        self.status = QLabel("")
        self.status.setMaximumWidth(640)

        self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel)
        self.buttonBox.button(QDialogButtonBox.Ok).setDefault(True)

        layout = QVBoxLayout()
        layout.addWidget(sliceLabel)
        layout.addWidget(self.sliceView)
        layout.addWidget(self.status)
        layout.addWidget(self.buttonBox)
        self.setLayout(layout)

        self.connect(self.buttonBox, SIGNAL("accepted()"), self, SLOT("accept()"))
        self.connect(self.buttonBox, SIGNAL("rejected()"), self, SLOT("reject()"))

        self.sliceModel = SliceModel()
        self.refreshAuthority()

    def accept(self):
        self.slices = self.sliceModel.getSelectedSlices()
        QDialog.accept(self)

    def setStatus(self, x):
        self.status.setText(x)

    def refreshAuthority(self):
        self.process = SfiProcess(self)
        self.connect(self.process, SIGNAL('finished()'), self.getAuthorityRecordFinished)

        self.process.listRecords(config.getAuthority(), None)
        self.setStatus("Refreshing slice list. This will take a moment...")

    def getAuthorityRecordFinished(self):
        self.disconnect(self.process, SIGNAL('finished()'), self.getAuthorityRecordFinished)

        faultString = self.process.getFaultString()
        if not faultString:
            self.setStatus("<font color='green'>Slice list refreshed.</font>")
            self.updateSliceView()
        else:
            self.setStatus("<font color='red'>Authority rec refresh error: %s</font>" % (faultString))

    def updateSliceView(self):
        self.sliceModel.updateModel()

        self.sliceView.setModel(self.sliceModel)
        self.sliceView.resizeColumnToContents(0)