#!/usr/bin/env python3

import configparser
import datetime
import logging
import os
import subprocess
from pathlib import Path

DEBUGGER = os.getenv("DEBUGGER", "")
TIMEOUT = int(os.getenv("TIMEOUT", "0"))
OUTPUT = "/test_output"


class Stopwatch:
    def __init__(self):
        self.reset()

    @property
    def duration_seconds(self) -> float:
        return (datetime.datetime.utcnow() - self.start_time).total_seconds()

    @property
    def start_time_str(self) -> str:
        return self.start_time_str_value

    def reset(self) -> None:
        self.start_time = datetime.datetime.utcnow()
        self.start_time_str_value = self.start_time.strftime("%Y-%m-%d %H:%M:%S")


def run_fuzzer(fuzzer: str, timeout: int):
    timeout_hard = timeout + 60
    logging.info(
        "Running fuzzer %s for %d seconds (hard timeout is %d)...",
        fuzzer,
        timeout,
        timeout_hard,
    )

    seed_corpus_dir = f"{fuzzer}.in"
    with Path(seed_corpus_dir) as path:
        if not path.exists() or not path.is_dir():
            seed_corpus_dir = ""

    active_corpus_dir = f"corpus/{fuzzer}"
    if not os.path.exists(active_corpus_dir):
        os.makedirs(active_corpus_dir)
    options_file = f"{fuzzer}.options"
    custom_libfuzzer_options = ""
    fuzzer_arguments = ""
    use_fuzzer_args = False

    with Path(options_file) as path:
        if path.exists() and path.is_file():
            parser = configparser.ConfigParser()
            parser.read(path)

            if parser.has_section("asan"):
                os.environ["ASAN_OPTIONS"] = (
                    f"{os.environ['ASAN_OPTIONS']}:{':'.join(f'{key}={value}' for key, value in parser['asan'].items())}"
                )

            if parser.has_section("msan"):
                os.environ["MSAN_OPTIONS"] = (
                    f"{os.environ['MSAN_OPTIONS']}:{':'.join(f'{key}={value}' for key, value in parser['msan'].items())}"
                )

            if parser.has_section("ubsan"):
                os.environ["UBSAN_OPTIONS"] = (
                    f"{os.environ['UBSAN_OPTIONS']}:{':'.join(f'{key}={value}' for key, value in parser['ubsan'].items())}"
                )

            if parser.has_section("libfuzzer"):
                custom_libfuzzer_options = " ".join(
                    f"-{key}={value}"
                    for key, value in parser["libfuzzer"].items()
                    if key not in ("jobs", "exact_artifact_path")
                )

            if parser.has_section("fuzzer_arguments"):
                fuzzer_arguments = " ".join(
                    (f"{key}") if value == "" else (f"{key}={value}")
                    for key, value in parser["fuzzer_arguments"].items()
                )

            use_fuzzer_args = parser.getboolean("CI", "FUZZER_ARGS", fallback=False)

    exact_artifact_path = f"{OUTPUT}/{fuzzer}.unit"
    status_path = f"{OUTPUT}/{fuzzer}.status"
    out_path = f"{OUTPUT}/{fuzzer}.out"
    stdout_path = f"{OUTPUT}/{fuzzer}.stdout"

    if not "-dict=" in custom_libfuzzer_options and Path(f"{fuzzer}.dict").exists():
        custom_libfuzzer_options += f" -dict={fuzzer}.dict"
    custom_libfuzzer_options += f" -exact_artifact_path={exact_artifact_path}"

    custom_libfuzzer_options += f" -timeout={timeout}"

    libfuzzer_corpora = f"{active_corpus_dir} {seed_corpus_dir}"

    cmd_line = f"{DEBUGGER} ./{fuzzer} {fuzzer_arguments}"

    env = None
    with_fuzzer_args = ""
    if use_fuzzer_args:
        env = {"FUZZER_ARGS": f"{custom_libfuzzer_options} {libfuzzer_corpora}".strip()}
        with_fuzzer_args = f" with FUZZER_ARGS '{env['FUZZER_ARGS']}'"
    else:
        cmd_line += f" {custom_libfuzzer_options} {libfuzzer_corpora}"

    logging.info("...will execute: '%s'%s", cmd_line, with_fuzzer_args)

    stopwatch = Stopwatch()
    try:
        with open(out_path, "wb") as out, open(stdout_path, "wb") as stdout:
            subprocess.run(
                cmd_line.split(),
                stdin=subprocess.DEVNULL,
                stdout=stdout,
                stderr=out,
                text=True,
                check=True,
                shell=False,
                errors="replace",
                timeout=timeout_hard,
                env=env,
            )
    except subprocess.CalledProcessError:
        logging.info("Fail running %s", fuzzer)
        with open(status_path, "w", encoding="utf-8") as status:
            status.write(
                f"FAIL\n{stopwatch.start_time_str}\n{stopwatch.duration_seconds}\n"
            )
    except subprocess.TimeoutExpired:
        logging.info("Successful running %s", fuzzer)
        with open(status_path, "w", encoding="utf-8") as status:
            status.write(
                f"OK\n{stopwatch.start_time_str}\n{stopwatch.duration_seconds}\n"
            )
    except Exception as e:
        logging.info("Unexpected exception running %s: %s", fuzzer, e)
        with open(status_path, "w", encoding="utf-8") as status:
            status.write(
                f"ERROR\n{stopwatch.start_time_str}\n{stopwatch.duration_seconds}\n"
            )
    else:
        logging.info("Error running %s", fuzzer)
        with open(status_path, "w", encoding="utf-8") as status:
            status.write(
                f"ERROR\n{stopwatch.start_time_str}\n{stopwatch.duration_seconds}\n"
            )


def main():
    logging.basicConfig(level=logging.INFO)

    subprocess.check_call("ls -al", shell=True)

    timeout = 30 if TIMEOUT == 0 else TIMEOUT

    with Path() as current:
        for fuzzer in current.iterdir():
            if (current / fuzzer).is_file() and os.access(current / fuzzer, os.X_OK):
                run_fuzzer(fuzzer.name, timeout)

    subprocess.check_call(f"ls -al {OUTPUT}", shell=True)


if __name__ == "__main__":
    main()