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

"""
/***************************************************************************
Name                 : DB Manager
Description          : Database manager plugin for QuantumGIS
Date                 : Oct 13, 2011
copyright            : (C) 2011 by Giuseppe Sucameli
email                : brush.tyler@gmail.com

The content of this file is based on 
- PG_Manager by Martin Dobias (GPLv2 license)
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
"""

from PyQt4.QtCore import *
from PyQt4.QtGui import *

from .db_plugins.plugin import DbError
from .dlg_db_error import DlgDbError
from .db_plugins.plugin import TableConstraint

from .ui.ui_DlgCreateConstraint import Ui_DlgCreateConstraint

class DlgCreateConstraint(QDialog, Ui_DlgCreateConstraint):
	
	def __init__(self, parent=None, table=None, db=None):
		QDialog.__init__(self, parent)
		self.table = table
		self.db = self.table.database() if self.table and self.table.database() else db
		self.setupUi(self)
		
		self.connect(self.buttonBox, SIGNAL("accepted()"), self.createConstraint)
		self.populateColumns()
		
	def populateColumns(self):
		self.cboColumn.clear()
		for fld in self.table.fields():
			self.cboColumn.addItem(fld.name)
			

	def createConstraint(self):
		constr = self.getConstraint()

		# now create the constraint
		QApplication.setOverrideCursor(Qt.WaitCursor)
		try:
			self.table.addConstraint(constr)
		except DbError, e:
			DlgDbError.showError(e, self)
			return
		finally:
			QApplication.restoreOverrideCursor()

		self.accept()

	def getConstraint(self):
		constr = TableConstraint(self.table)
		constr.name = u""
		constr.type = TableConstraint.TypePrimaryKey if self.radPrimaryKey.isChecked() else TableConstraint.TypeUnique
		constr.columns = []
		column = self.cboColumn.currentText()
		for fld in self.table.fields():
			if fld.name == column:
				constr.columns.append( fld.num )
				break
		return constr

