#!/usr/bin/env python3

# Copyright 2013 Jussi Pakkanen

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import sys, os, subprocess, time, datetime, pickle, multiprocessing
import concurrent.futures as conc
from optparse import OptionParser

parser = OptionParser()
parser.add_option('--wrapper', default=None, dest='wrapper',
                  help='wrapper to run tests with (e.g. valgrind)')

class TestRun():
    def __init__(self, res, duration, stdo, stde):
        self.res = res
        self.duration = duration
        self.stdo = stdo
        self.stde = stde

def write_log(logfile, test_name, result_str, stdo, stde):
    logfile.write(result_str + '\n\n')
    logfile.write('--- "%s" stdout ---\n' % test_name)
    logfile.write(stdo)
    logfile.write('\n--- "%s" stderr ---\n' % test_name)
    logfile.write(stde)
    logfile.write('\n-------\n\n')

def run_single_test(wrap, fname, is_cross, exe_runner):
    if is_cross:
        if exe_runner is None:
            # 'Can not run test on cross compiled executable 
            # because there is no execute wrapper.
            cmd = None
        else:
            cmd = [exe_runner, fname]
    else:
        cmd = [fname]
    if cmd is None:
        res = 'SKIP'
        duration = 0.0
        stdo = 'Not run because can not execute cross compiled binaries.'
        stde = ''
    else:
        cmd = wrap + cmd
        starttime = time.time()
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        (stdo, stde) = p.communicate()
        endtime = time.time()
        duration = endtime - starttime
        stdo = stdo.decode()
        stde = stde.decode()
        if p.returncode == 0:
            res = 'OK'
        else:
            res = 'FAIL'
    return TestRun(res, duration, stdo, stde)

def print_stats(numlen, tests, name, result, i, logfile):
    startpad = ' '*(numlen - len('%d' % (i+1)))
    num = '%s%d/%d' % (startpad, i+1, len(tests))
    padding1 = ' '*(40-len(name))
    padding2 = ' '*(5-len(result.res))
    result_str = '%s %s%s%s%s(%5.2f s)' % \
        (num, name, padding1, result.res, padding2, result.duration)
    print(result_str)
    write_log(logfile, name, result_str, result.stdo, result.stde)

def drain_futures(futures):
    for i in futures:
        (result, numlen, tests, name, result, i, logfile) = i
        print_stats(numlen, tests, name, result.result(), i, logfile)

def run_tests(options, datafilename):
    logfile_base = 'meson-logs/testlog'
    if options.wrapper is None:
        wrap = []
        logfilename = logfile_base + '.txt'
    else:
        wrap = [options.wrapper]
        logfilename = logfile_base + '-' + options.wrapper.replace(' ', '_') + '.txt'
    logfile = open(logfilename, 'w')
    logfile.write('Log of Meson test suite run on %s.\n\n' % datetime.datetime.now().isoformat())
    tests = pickle.load(open(datafilename, 'rb'))
    numlen = len('%d' % len(tests))
    varname = 'MESON_TESTTHREADS'
    if varname in os.environ:
        try:
            num_workers = int(os.environ[varname])
        except ValueError:
            write_log('Invalid value in %s, using 1 thread.' % varname)
            num_workers = 1
    else:
        num_workers = multiprocessing.cpu_count()
    executor = conc.ThreadPoolExecutor(max_workers=num_workers)
    futures = []
    for i, test in enumerate(tests):
        if not test.is_parallel:
            drain_futures(futures)
            futures = []
            res = run_single_test(wrap, test.fname, test.is_cross, test.exe_runner)
            print_stats(numlen, tests, test.name, res, i, logfile)
        else:
            f = executor.submit(run_single_test, wrap, test.fname,
                                test.is_cross, test.exe_runner)
            futures.append((f, numlen, tests, test.name, f, i, logfile))
    drain_futures(futures)
    print('\nFull log written to %s.' % logfilename)

if __name__ == '__main__':
    (options, args) = parser.parse_args(sys.argv)
    if len(args) != 2:
        print('Test runner for Meson. Do not run on your own, mmm\'kay?')
        print('%s [data file]' % sys.argv[0])
    datafile = args[1]
    run_tests(options, datafile)