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

from sfa.util.record import SfaRecord, SliceRecord, AuthorityRecord, UserRecord
from sface.config import config
from sface.sfiprocess import SfiProcess
from sface.screens.sfascreen import SfaScreen

NAME_COLUMN = 0
#ROLE_COLUMN = 1
MEMBERSHIP_STATUS_COLUMN = 1
SERVER_MEMBERSHIP_STATUS_COLUMN = 2

user_status = { "in": "Already Selected",
                "out": "Not Selected",
                "add": "To be Added",
                "remove": "To be Removed"}

class UserView(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.")

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

        # This is a hostname
        if status_data == user_status['in']:
            model.setData(status_index, QString(user_status['remove']))
        elif status_data == user_status['out']:
            model.setData(status_index, QString(user_status['add']))
        elif status_data in (user_status['add'], user_status['remove']):
            if server_status_data == user_status["in"]:
                model.setData(status_index, QString(user_status['in']))
            else:
                model.setData(status_index, QString(user_status['out']))

        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()
        self.emit(SIGNAL('hostnameClicked(QString)'), node_data)


class UsersWidget(QWidget):
    def __init__(self, parent):
        QWidget.__init__(self, parent)

        self.process = SfiProcess(self)

        self.slicename = QLabel("", self)
        self.updateSliceName()
        self.slicename.setScaledContents(False)
        searchlabel = QLabel ("Search: ", self)
        searchlabel.setScaledContents(False)
        searchbox = QLineEdit(self)
        searchbox.setAttribute(Qt.WA_MacShowFocusRect, 0)

        toplayout = QHBoxLayout()
        toplayout.addWidget(self.slicename, 0, Qt.AlignLeft)
        toplayout.addStretch()
        toplayout.addWidget(searchlabel, 0, Qt.AlignRight)
        toplayout.addWidget(searchbox, 0, Qt.AlignRight)

        self.userView = UserView()
        #self.userView.setSelectionBehavior(QAbstractItemView.SelectRows)
        #self.userView.setSelectionMode(QAbstractItemView.SingleSelection)

        refresh = QPushButton("Refresh", self)
        refresh.setSizePolicy(QSizePolicy.Maximum, QSizePolicy.Maximum)
        submit = QPushButton("Submit", self)
        submit.setSizePolicy(QSizePolicy.Maximum, QSizePolicy.Maximum)

        bottomlayout = QHBoxLayout()
        bottomlayout.addWidget(refresh, 0, Qt.AlignLeft)
        bottomlayout.addStretch()
        bottomlayout.addWidget(submit, 0, Qt.AlignRight)

        layout = QVBoxLayout()
        layout.addLayout(toplayout)
        layout.addWidget(self.userView)
        layout.addLayout(bottomlayout)
        self.setLayout(layout)
        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)

        self.userModel = QStandardItemModel(0, 4, self)

        self.connect(refresh, SIGNAL('clicked()'), self.refresh)
        self.connect(submit, SIGNAL('clicked()'), self.submit)

        self.updateView()

    def submitFinished(self):
        self.setStatus("<font color='green'>Slice data submitted.</font>")
        QTimer.singleShot(1000, self.refresh)

    def getSliceRecordFinished(self):
        self.setStatus("<font color='green'>Authority data refreshed.</font>", timeout=5000)
        self.refreshAuthority()

    def getAuthorityRecordFinished(self):
        self.setStatus("<font color='green'>Slice data refreshed.</font>", timeout=5000)
        self.updateView()
        #self.parent().signalAll("usersUpdated")

    def readSliceRecord(self):
        rec_file = config.getSliceRecordFile()
        if os.path.exists(rec_file):
            xml = open(rec_file).read()
            rec = SliceRecord()
            rec.load_from_string(xml)
            return rec
        return None

    def readAuthorityRecord(self):
        rec_file = config.getAuthorityRecordFile()
        if os.path.exists(rec_file):
            xml = open(rec_file).read()
            rec = AuthorityRecord()
            rec.load_from_string(xml)
            return rec
        return None

    def readUserRecord(self, i):
        rec_file = config.getAuthorityListFile(i)
        if os.path.exists(rec_file):
            xml = open(rec_file).read()
            rec = UserRecord()
            rec.load_from_string(xml)
            return rec
        return None

    def setStatus(self, msg, timeout=None):
        self.parent().setStatus(msg, timeout)

    def checkRunningProcess(self):
        if self.process.isRunning():
            self.setStatus("<font color='red'>There is already a process running. Please wait.</font>")
            return True
        return False

    def submit(self):
        if self.checkRunningProcess():
            return

        rec = self.readSliceRecord()
        change = self.process_table(rec)

        if not change:
            self.setStatus("<font color=red>No change in slice data. Not submitting!</font>", timeout=3000)
            return

        rec_file = config.getSliceRecordFile()
        file(rec_file, "w").write(rec.save_to_string())

        self.disconnect(self.process, SIGNAL('finished()'), self.getAuthorityRecordFinished)
        self.connect(self.process, SIGNAL('finished()'), self.submitFinished)

        self.process.updateRecord(rec_file)
        self.setStatus("Sending slice record. This will take some time...")

    def refresh(self):
        if not config.getSlice():
            self.setStatus("<font color='red'>Slice not set yet!</font>")
            return

        if self.process.isRunning():
            self.setStatus("<font color='red'>There is already a process running. Please wait.</font>")
            return

        self.disconnect(self.process, SIGNAL('finished()'), self.submitFinished)
        self.connect(self.process, SIGNAL('finished()'), self.getSliceRecordFinished)

        self.process.getSliceRecord()
        self.setStatus("Refreshing slice record. This will take some time...")

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

        self.process.listRecords(config.getAuthority(), "user", config.getAuthorityListFile())
        self.setStatus("Refreshing user records. This will take some time...")

    def addTableItem(self, table, row, col, val, data=None, readonly=True):
        item = QTableWidgetItem(str(val))
        if readonly:
            item.setFlags(Qt.ItemIsSelectable | Qt.ItemIsEnabled)
        if data:
            if not isinstance(data, str):
               data = pickle.dumps(data)
            item.setData(Qt.UserRole, QVariant(data))
        table.setItem(row, col, item)

    def updateModel(self):
        self.userModel.clear()

        sliceRec = self.readSliceRecord()
        if not sliceRec:
            return None

        added_persons = []
        slice_persons = []

        #for pi in sliceRec.get_field("PI", default=[]):
        #    name = str(pi)
        #    if not name in added_persons:
        #         slice_persons.append({"name": name, "role": "PI", "member": user_status["in"]})
        #         added_persons.append(name)

        for researcher in sliceRec.get_field("researcher", default=[]):
            name = str(researcher)
            if not name in added_persons:
                 slice_persons.append({"name": name, "role": "researcher", "member": user_status["in"]})
                 added_persons.append(name)

        i=1
        while (os.path.exists(config.getAuthorityListFile(i))):
            rec = self.readUserRecord(i)
            if rec:
                name = str(rec.get_name())
                if not name in added_persons:
                    slice_persons.append({"name": name, "role": "", "member": user_status["out"]})
                    added_persons.append(name)
            i=i+1

        rootItem = self.userModel.invisibleRootItem()

        for person in slice_persons:
            rootItem.appendRow([QStandardItem(QString(person["name"])),
                               #QStandardItem(QString(person["role"])),
                               QStandardItem(QString(person["member"])),
                               QStandardItem(QString(person["member"]))])

        headers = QStringList() << "User Name" << "Status" << "ServerStatus"
        self.userModel.setHorizontalHeaderLabels(headers)

    def updateView(self):
        self.updateModel()

        self.userView.setModel(self.userModel)
        self.userView.hideColumn(SERVER_MEMBERSHIP_STATUS_COLUMN)
        self.userView.resizeColumnToContents(0)

    def updateSliceName(self):
        self.slicename.setText("Slice : %s" % (config.getSlice() or "None"))

    def nodeSelectionChanged(self, hostname):
        self.parent().nodeSelectionChanged(hostname)

    def process_table(self, slicerec):
        change = False

        item = self.userModel.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 == user_status['add']):
                slicerec.get_field("researcher").append(childName)
                change = True
            elif (childStatus == user_status['remove']):
                if childName in slicerec.get_field("PI"):
                     slicerec.get_field("PI").remove(childName)
                if childName in slicerec.get_field("researcher"):
                     slicerec.get_field("researcher").remove(childName)
                change = True

        print "XXX", slicerec.get_field("researcher")
        return change


class UserScreen(SfaScreen):
    def __init__(self, parent):
        SfaScreen.__init__(self, parent)

        slice = UsersWidget(self)
        self.init(slice, "Users", "OneLab SFA crawler")

    def configurationChanged(self):
        self.widget.updateSliceName()
        self.widget.updateView()