#! /usr/bin/env python
# ==========================================================================
# This scripts performs unit tests for the csobs2caldb script.
#
# Copyright (C) 2016 Juergen Knoedlseder
#
# 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 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# ==========================================================================
import os
import gammalib
import cscripts
from testing import test


# ================================= #
# Test class for csobs2caldb script #
# ================================= #
class Test(test):
    """
    Test class for csobs2caldb script

    This test class makes unit tests for the csobs2caldb script by using it
    from the command line and from Python.
    """
    
    # Constructor
    def __init__(self):
        """
        Constructor
        """
        # Call base class constructor
        test.__init__(self)

        # Set members
        self._inobs = self._datadir + '/obs_unbinned.xml'

        # Clean calibration database
        os.system('rm -rf caldb >/dev/null 2>&1')
        os.system('mkdir -p caldb >/dev/null 2>&1')

        # Return
        return

    # Set test functions
    def set(self):
        """
        Set all test functions
        """
        # Set test name
        self.name('csobs2caldb')

        # Append tests
        self.append(self._test_cmd, 'Test csobs2caldb on command line')
        self.append(self._test_python, 'Test csobs2caldb from Python')

        # Return
        return

    # Test csobs2caldb on command line
    def _test_cmd(self):
        """
        Test csobs2caldb on the command line
        """
        # Set script name
        csobs2caldb = self._script('csobs2caldb')

        # Setup csobs2caldb command
        cmd = csobs2caldb+' inobs="'+self._inobs+'"'+ \
                          ' caldb="cta" irf="Cmd1" rootdir="caldb"'+ \
                          ' logfile="csobs2caldb_cmd1.log" chatter=1'

        # Check if execution of wrong command fails
        self.test_assert(self._execute('command_that_does_not_exist') != 0,
             'Self test of test script')

        # Check if execution was successful
        self.test_assert(self._execute(cmd) == 0,
             'Check successful execution from command line')

        # Check response
        self._check_response('cta', 'Cmd1')

        # Setup csobs2caldb command
        cmd = csobs2caldb+' inobs="xml_file_that_does_not_exist.xml"'+ \
                          ' caldb="cta" irf="Cmd2" rootdir="caldb"'+ \
                          ' logfile="csobs2caldb_cmd2.log"'

        # Check if execution failed
        self.test_assert(self._execute(cmd) != 0,
             'Check invalid input file when executed from command line')

        # Return
        return

    # Test csobs2caldb from Python
    def _test_python(self):
        """
        Test csobs2caldb from Python
        """
        # Set-up csobs2caldb using "inobs" parameter
        irf = cscripts.csobs2caldb()
        irf['inobs']   = self._inobs
        irf['caldb']   = 'cta'
        irf['irf']     = 'Py1'
        irf['rootdir'] = 'caldb'
        irf['logfile'] = 'csobs2caldb_py1.log'
        irf['chatter'] = 2

        # Run csobs2caldb script and save IRF
        irf.logFileOpen()   # Make sure we get a log file
        irf.run()
        irf.save()

        # Check response
        self._check_response('cta', 'Py1')

        # Load observation container
        obs = gammalib.GObservations(self._inobs)

        # Set-up csobs2caldb using observation container
        irf = cscripts.csobs2caldb(obs)
        irf['caldb']   = 'cta'
        irf['irf']     = 'Py2'
        irf['rootdir'] = 'caldb'
        irf['logfile'] = 'csobs2caldb_py2.log'
        irf['chatter'] = 3

        # Execute csobs2caldb script
        irf.execute()

        # Check response
        self._check_response('cta', 'Py2')

        # Return
        return

    # Check response
    def _check_response(self, caldb, irf):
        """
        Check response
        """
        # Open calibration database
        db = gammalib.GCaldb('caldb')
        db.open('cta', caldb)

        # Get filenames of response components
        expr  = 'NAME('+irf+')'
        aeff  = gammalib.GFilename(db.filename('','','EFF_AREA','','',expr))
        psf   = gammalib.GFilename(db.filename('','','RPSF','','',expr))
        edisp = gammalib.GFilename(db.filename('','','EDISP','','',expr))
        bgd   = gammalib.GFilename(db.filename('','','BGD','','',expr))

        # Check whether files exist
        self.test_assert(aeff.exists(), 'Effective area file exists')
        self.test_assert(psf.exists(), 'Point spread function file exists')
        self.test_assert(edisp.exists(), 'Energy dispersion file exists')
        self.test_assert(bgd.exists(), 'Background file exists')
        
        # Return
        return