#! /usr/bin/env python3
#
# Copyright (c) 2014 Siddharth Santurkar
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation;
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

from __future__ import print_function

import argparse
import os
import subprocess
import sys


def print_case_in_file(case_string, out):
    for i in range(100):
        print("-", end="", file=out)
    print(file=out)
    print("running test case " + case_string, end="\n\n", file=out)
    out.flush()


def print_failed_cases(failed_cases):
    print("\nFailed Cases:")
    for case in failed_cases:
        print(case)


def print_cmds(cmds):
    print("Commands to be executed:")
    for cmd in cmds:
        print(cmd.replace(sys.executable, ""))


def set_workdir():
    dir_files = [f for f in os.listdir(".") if os.path.exists(f)]
    if not "VERSION" in dir_files and not "ns3" in dir_files:
        if (
            os.path.split(os.path.abspath("."))[1] == "tests"
            and os.path.split(os.path.abspath(os.pardir))[1] == "utils"
        ):
            os.chdir("../../")
        else:
            print("Error: Invalid working directory")
            sys.exit(1)


## TestBaseClass class
class TestBaseClass:
    """
    Generic class for testing tools based on provided commands and test cases.
    """

    ## @var my_env
    #  os environment
    ## @var mode
    #  mode
    ## @var outfile
    #  output file
    ## @var options
    #  options

    def __init__(self, argv, desc, mode):
        """!
        Provide input argument list, description and mode of the suite being executed.
        @param self this object
        @param argv argument list
        @param desc description
        @param mode test mode
        """
        self.my_env = os.environ
        set_workdir()
        self.my_env["LD_LIBRARY_PATH"] = os.getcwd() + "/build"
        self.mode = mode
        self.outfile = "test-port-" + self.mode + ".out"
        self.options = self.parseargs(argv, desc)

    def parseargs(self, argv, desc):
        """!
        Parses the commandline arguments
        @param self this object
        @param argv argument list
        @param desc description
        @return command line arguments
        """
        parser = argparse.ArgumentParser(description=desc)
        parser.add_argument(
            "-f",
            "--file",
            action="store",
            dest="out_file",
            default=self.outfile,
            metavar="FILE",
            help="File to be used for storing the command specific output (Default: "
            + self.outfile
            + ")",
        )
        parser.add_argument(
            "-c",
            action="store_true",
            dest="cmds",
            default=False,
            help="List out all the commands being tested",
        )
        parser.add_argument(
            "-m",
            action="store_true",
            dest="mute",
            default=False,
            help="Sends only stderr output to FILE",
        )
        parser.add_argument(
            "-x",
            "--customcmd",
            action="store",
            dest="custcmd",
            default=None,
            help="Enter a comma-separated list of commands to override the existing ones. NOT APPLICABLE FOR TEST-PY SUITE.",
        )
        return parser.parse_args(argv)

    def override_cmds(self):
        """!
        Can be used by importing suite to handle custom commands
        @param self this object
        @return custom commands
        """
        return self.options.custcmd

    def runtests(self, cmds):
        """!
        Execute the tests.
        @param self this object
        @param cmds test commands
        @return error code
        """
        if self.options.cmds:
            print_cmds(cmds)
            return
        base_dir = os.sep.join(
            os.path.abspath(__file__).replace(os.path.pathsep, "/").split("/")[:-3]
        )
        final_return = 0
        total_tests = len(cmds)
        passed = 0
        progress = 0.0
        failed_cases = []
        with open(self.options.out_file, "w", encoding="utf-8") as out:
            outstream = out
            with open(os.devnull, "w", encoding="utf-8") as sink:
                if self.options.mute:
                    outstream = sink
                for cmd in cmds:
                    case_string = cmd.replace(sys.executable, "")
                    print("running test case: " + case_string)
                    print_case_in_file(case_string, out)
                    progress += 1
                    ret = subprocess.call(
                        cmd, shell=True, env=self.my_env, stdout=outstream, stderr=out, cwd=base_dir
                    )
                    if not ret:
                        passed += 1
                    else:
                        final_return = 1
                        failed_cases.append(case_string)
                    print(
                        "[ %s out of %s ] test cases passed; Progress = %.2f%% \n"
                        % (passed, total_tests, progress * 100 / total_tests)
                    )
        if final_return != 0:
            print_failed_cases(failed_cases)
        else:
            print("\nAll cases passed")
        print("Detailed output available in " + self.options.out_file, end="\n\n")
        return final_return