#!/usr/bin/env python3

# ===--- Benchmark_QuickCheck.in -----------------------------------------===//
#
#  This source file is part of the Swift.org open source project
#
#  Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
#  Licensed under Apache License v2.0 with Runtime Library Exception
#
#  See https://swift.org/LICENSE.txt for license information
#  See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
#
# ===---------------------------------------------------------------------===//

import os
import subprocess
import sys

sys.path.append("@PATH_TO_DRIVER_LIBRARY@")

import perf_test_driver  # noqa (E402 module level import not at top of file)

# This is a hacked up XFAIL list. It should really be a json file, but it will
# work for now. Add in the exact name of the pass to XFAIL.
XFAIL_LIST = []


class QuickCheckResult(perf_test_driver.Result):
    def __init__(self, name, success):
        assert isinstance(success, bool)
        did_fail = not success
        perf_test_driver.Result.__init__(self, name, did_fail, "", XFAIL_LIST)

    def print_data(self, max_test_len):
        fmt = "{:<%d}{:<10}" % (max_test_len + 5)
        print(fmt.format(self.get_name(), self.get_result()))


class QuickCheckBenchmarkDriver(perf_test_driver.BenchmarkDriver):
    def __init__(self, binary, xfail_list, num_iters, opt_levels):
        perf_test_driver.BenchmarkDriver.__init__(
            self, binary, xfail_list, enable_parallel=True, opt_levels=opt_levels
        )
        self.num_iters = num_iters

    def print_data_header(self, max_test_len):
        fmt = "{:<%d}{:<10}" % (max_test_len + 5)
        print(fmt.format("Name", "Result"))

    # Propagate any data from this class that is needed for individual
    # tests. The reason this is needed is to avoid issues with attempting to
    # access a value in a different process.
    def prepare_input(self, name):
        return {"num_samples": 1, "num_iters": self.num_iters}

    def run_test_inner(self, data, num_iters):
        p = subprocess.Popen(
            [
                data["path"],
                "--num-samples={}".format(data["num_samples"]),
                "--num-iters={}".format(num_iters),
                data["test_name"],
            ],
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            universal_newlines=True,
        )
        error_out = p.communicate()[1].split("\n")
        result = p.returncode
        if result is None:
            raise RuntimeError("Expected one line of output")
        if result != 0:
            raise RuntimeError("Process segfaulted")
        return error_out

    def run_test(self, data, num_iters):
        try:
            args = [data, num_iters]
            perf_test_driver.run_with_timeout(self.run_test_inner, args)
        except Exception as e:
            sys.stderr.write(
                "Child Process Failed! (%s,%s). Error: %s\n"
                % (data["path"], data["test_name"], e)
            )
            sys.stderr.flush()
            return None
        return True

    def process_input(self, data):
        test_name = "({},{})".format(data["opt"], data["test_name"])
        print("Running {}...".format(test_name))
        sys.stdout.flush()
        if self.run_test(data, data["num_iters"]) is None:
            return QuickCheckResult(test_name, success=False)
        return QuickCheckResult(test_name, success=True)


SWIFT_BIN_DIR = os.path.dirname(os.path.abspath(__file__))


def parse_args():
    import argparse

    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--filter",
        type=str,
        default=None,
        help="Filter out any test that does not match the given regex",
    )
    parser.add_argument("--num-iters", type=int, default=2)
    default_opt_levels = perf_test_driver.BenchmarkDriver_OptLevels
    parser.add_argument("--opt-level", choices=default_opt_levels)
    return parser.parse_args()


if __name__ == "__main__":
    args = parse_args()
    opt_levels = perf_test_driver.BenchmarkDriver_OptLevels
    if args.opt_level is not None:
        opt_levels = [args.opt_level]
    driver = QuickCheckBenchmarkDriver(
        SWIFT_BIN_DIR, XFAIL_LIST, args.num_iters, opt_levels
    )
    if driver.run(args.filter):
        sys.exit(0)
    else:
        sys.exit(-1)