# -*- coding: utf-8 -*-
"""!@package grass.gunittest.main

@brief GRASS Python testing framework module for running from command line

Copyright (C) 2014 by the GRASS Development Team
This program is free software under the GNU General Public
License (>=v2). Read the file COPYING that comes with GRASS GIS
for details.

@author Vaclav Petras
"""

import os
import sys
import argparse

from unittest.main import TestProgram, USAGE_AS_MAIN
TestProgram.USAGE = USAGE_AS_MAIN

from .loader import GrassTestLoader
from .runner import (GrassTestRunner, MultiTestResult,
                     TextTestResult, KeyValueTestResult)
from .invoker import GrassTestFilesInvoker
from .utils import silent_rmtree
from .reporters import FileAnonymizer

import grass.script.core as gcore


class GrassTestProgram(TestProgram):
    """A class to be used by individual test files (wrapped in the function)"""

    def __init__(self, exit_at_end, grass_location, clean_outputs=True,
                 unittest_argv=None, module=None,
                 verbosity=1,
                 failfast=None, catchbreak=None):
        """Prepares the tests in GRASS way and then runs the tests.

        :param bool clean_outputs: if outputs in mapset and in ?
        """
        self.test = None
        self.grass_location = grass_location
        # it is unclear what the exact behavior is in unittest
        # buffer stdout and stderr during tests
        buffer_stdout_stderr = False

        grass_loader = GrassTestLoader(grass_location=self.grass_location)

        text_result = TextTestResult(stream=sys.stderr,
                                     descriptions=True,
                                     verbosity=verbosity)
        keyval_file = open('test_keyvalue_result.txt', 'w')
        keyval_result = KeyValueTestResult(stream=keyval_file)
        result = MultiTestResult(results=[text_result, keyval_result])

        grass_runner = GrassTestRunner(verbosity=verbosity,
                                       failfast=failfast,
                                       buffer=buffer_stdout_stderr,
                                       result=result)

        super(GrassTestProgram, self).__init__(module=module,
                                               argv=unittest_argv,
                                               testLoader=grass_loader,
                                               testRunner=grass_runner,
                                               exit=exit_at_end,
                                               verbosity=verbosity,
                                               failfast=failfast,
                                               catchbreak=catchbreak,
                                               buffer=buffer_stdout_stderr)
        keyval_file.close()


def test():
    """Run a test of a module.
    """
    # TODO: put the link to to the report only if available
    # TODO: how to disable Python code coverage for module and C tests?
    # TODO: we probably need to have different test  functions for C, Python modules, and Python code
    # TODO: combine the results using python -m coverage --help | grep combine
    # TODO: function to anonymize/beautify file names (in content and actual filenames)
    # TODO: implement coverage but only when requested by invoker and only if
    # it makes sense for tests (need to know what is tested)
    # doing_coverage = False
    #try:
    #    import coverage
    #    doing_coverage = True
    #    cov = coverage.coverage(omit="*testsuite*")
    #    cov.start()
    #except ImportError:
    #    pass
        # TODO: add some message somewhere

    # TODO: enable passing omit to exclude also gunittest or nothing
    program = GrassTestProgram(module='__main__', exit_at_end=False, grass_location='all')
    # TODO: check if we are in the directory where the test file is
    # this will ensure that data directory is available when it is requested

    #if doing_coverage:
    #    cov.stop()
    #    cov.html_report(directory='testcodecoverage')

    # TODO: is sys.exit the right thing here
    sys.exit(not program.result.wasSuccessful())


def discovery():
    """Recursively find all tests in testsuite directories and run them

    Everything is imported and runs in this process.

    Runs using::
        python main.py discovery [start_directory]
    """

    program = GrassTestProgram(grass_location='nc', exit_at_end=False)

    sys.exit(not program.result.wasSuccessful())


# TODO: makefile rule should depend on the whole build
# TODO: create a full interface (using grass parser or argparse)
def main():
    parser = argparse.ArgumentParser(
    description='Run test files in all testsuite directories starting'
                ' from the current one'
                ' (runs on active GRASS session)')
    parser.add_argument('--location', dest='location', action='store',
                        help='Name of location where to perform test', required=True)
    parser.add_argument('--location-type', dest='location_type', action='store',
                        default='nc',
                        help='Type of tests which should be run'
                             ' (tag corresponding to location)')
    parser.add_argument('--grassdata', dest='gisdbase', action='store',
                        default=None,
                        help='GRASS data(base) (GISDBASE) directory'
                        ' (current GISDBASE by default)')
    parser.add_argument('--output', dest='output', action='store',
                        default='testreport',
                        help='Output directory')
    args = parser.parse_args()
    gisdbase = args.gisdbase
    if gisdbase is None:
        # here we already rely on being in GRASS session
        gisdbase = gcore.gisenv()['GISDBASE']
    location = args.location
    location_type = args.location_type

    if not gisdbase:
        sys.stderr.write("GISDBASE (grassdata directory)"
                         " cannot be empty string\n" % gisdbase)
        sys.exit(1)
    if not os.path.exists(gisdbase):
        sys.stderr.write("GISDBASE (grassdata directory) <%s>"
                         " does not exist\n" % gisdbase)
        sys.exit(1)
    results_dir = args.output
    silent_rmtree(results_dir)  # TODO: too brute force?

    start_dir = '.'
    abs_start_dir = os.path.abspath(start_dir)
    invoker = GrassTestFilesInvoker(
        start_dir=start_dir,
        file_anonymizer=FileAnonymizer(paths_to_remove=[abs_start_dir]))
    # TODO: remove also results dir from files
    # as an enhancemnt
    # we can just iterate over all locations available in database
    # but the we don't know the right location type (category, label, shortcut)
    invoker.run_in_location(gisdbase=gisdbase,
                            location=location,
                            location_type=location_type,
                            results_dir=results_dir)
    return 0

if __name__ == '__main__':
    sys.exit(main())