#!/usr/bin/env python3
"""Создание и проверка HDD-набора отрицательных сценариев copy-job."""

from __future__ import annotations

import pathlib
import sys


SIZES = {
    "BEGIN.BIN": 8192,
    "LATE.BIN": 4096,
    "READERR.BIN": 4096,
    "RONLY.BIN": 4096,
    "RENAME.BIN": 4096,
    "RACE.BIN": 4096,
}


def content(name: str, size: int) -> bytes:
    seed = sum(name.encode("ascii")) & 0xFF
    return bytes((seed + index * 29 + (index >> 7)) & 0xFF
                 for index in range(size))


def create(root: pathlib.Path) -> None:
    source = root / "SOURCE"
    (root / "TARGET").mkdir(parents=True)
    source.mkdir()
    for name, size in SIZES.items():
        (source / name).write_bytes(content(name, size))


def verify(root: pathlib.Path) -> None:
    failures: list[str] = []
    source = root / "SOURCE"
    target = root / "TARGET"
    result = root / "RESULT.TXT"

    for name, size in SIZES.items():
        path = source / name
        if not path.is_file() or path.read_bytes() != content(name, size):
            failures.append(f"повреждён SOURCE/{name}")

    expected_lines = [
        "PASS missing EXE errno 3",
        "PASS missing source cleanup",
        "PASS cancel before first read",
        "PASS last block stops before commit",
        "PASS cancel at pre-commit",
        "PASS read error cleanup",
        "PASS readonly write cleanup",
        "PASS rename error cleanup",
        "PASS target race refuses overwrite",
        "PASS EMM restored",
        "ALL PASS",
    ]
    if not result.is_file():
        failures.append("не создан RESULT.TXT")
    else:
        text = result.read_bytes().decode("cp866", errors="replace")
        for line in expected_lines:
            if line not in text:
                failures.append(f"нет строки результата: {line}")

    if not target.is_dir():
        failures.append("исчез TARGET")
    else:
        unexpected = sorted(path.name for path in target.iterdir()
                            if path.name.upper() != "RACE.BIN")
        if unexpected:
            failures.append("лишние файлы TARGET: " + ", ".join(unexpected))
        race = target / "RACE.BIN"
        if not race.is_file() or race.read_bytes() != b"KEEP":
            failures.append("RACE.BIN перезаписан или отсутствует")
        temporaries = sorted(path.name for path in target.glob("~SC*.TMP"))
        if temporaries:
            failures.append("остались temp: " + ", ".join(temporaries))

    if failures:
        for failure in failures:
            print(f"FAIL: {failure}")
        raise SystemExit(1)
    print("PASS: missing EXE, cancel, read/readonly/rename, race и EMM cleanup.")


def main() -> None:
    if len(sys.argv) != 3 or sys.argv[1] not in {"create", "verify"}:
        raise SystemExit(f"usage: {sys.argv[0]} create|verify DIR")
    root = pathlib.Path(sys.argv[2])
    if sys.argv[1] == "create":
        create(root)
    else:
        verify(root)


if __name__ == "__main__":
    main()