#!/usr/bin/env python3

import argparse
import json
import os
import re
import subprocess
import sys
from collections import Counter
from pathlib import Path

# Global paths
TEST_DIR = Path(os.environ["TEST_DIR"])
WRAPPER_OUT = Path(os.environ["WRAPPER_OUT"])
WRAPPER_PREFIX = Path(os.environ["WRAPPER_PREFIX"])

# Other config
BENCHMARK = "build"

sys.path.append(str(TEST_DIR))
import measure  # noqa: E402


def save_measurement(metric: str, value: float, unit: str | None = None) -> None:
    data = {"metric": metric, "value": value}
    if unit is not None:
        data["unit"] = unit
    with open(WRAPPER_OUT, "a") as f:
        f.write(f"{json.dumps(data)}\n")


def run(*command: str) -> None:
    result = subprocess.run(command)
    if result.returncode != 0:
        sys.exit(result.returncode)


def run_capture(*command: str) -> tuple[str, str]:
    result = subprocess.run(command, capture_output=True, encoding="utf-8")
    if result.returncode != 0:
        print(result.stdout, end="", file=sys.stdout)
        print(result.stderr, end="", file=sys.stderr)
        sys.exit(result.returncode)
    return result.stdout, result.stderr


def get_module(setup: Path) -> str:
    with open(setup) as f:
        return json.load(f)["name"]


def count_bytes(module: str, path: Path, suffix: str) -> None:
    try:
        bytes = path.with_suffix(suffix).stat().st_size
    except FileNotFoundError:
        return
    save_measurement(f"{BENCHMARK}/module/ir/{module}//bytes {suffix}", bytes, "B")


def run_leanir(module: str) -> None:
    stdout, stderr = measure.main(
        cmd=[
            "leanir",
            *sys.argv[1:],
            *("-Dprofiler=true", "-Dprofiler.threshold=9999999"),
        ],
        output=WRAPPER_OUT,
        topics=[f"{BENCHMARK}/module/ir/{module}"],
        metrics={"instructions", "cycles"},
        append=True,
        capture=True,
    )

    # Output of `leanir -Dprofiler=true`
    # See timeit.cpp for the time format
    for line in stderr.splitlines():
        if match := re.fullmatch(r"\t(.*) ([\d.]+)(m?s)", line):
            name = match.group(1)
            seconds = float(match.group(2))
            if match.group(3) == "ms":
                seconds = seconds / 1000
            save_measurement(f"{BENCHMARK}/profile/ir/{name}//wall-clock", seconds, "s")


def main() -> None:
    parser = argparse.ArgumentParser()
    parser.add_argument("setup", type=Path)
    parser.add_argument("ir", type=Path)
    parser.add_argument("c", type=Path)
    args, _ = parser.parse_known_args()

    module = get_module(args.setup)

    run_leanir(module)

    count_bytes(module, args.ir, ".ir")
    count_bytes(module, args.c, ".c")


if __name__ == "__main__":
    main()