"""Acceptance test for time-to-green task T09 (written for the 2026-10-30 bench; the protocol names it, does not ship it).

T09: logreport (refactored): read from stdin when the filename argument is `-`.
Green: python -m unittest tasks.t09_test   (run from the repo root)

Driven through the command line: `python <script> -` with the log on stdin must print the same report as
the same log read from a file. The shipped tests run as regression from a frozen copy in tasks/.
"""
from __future__ import annotations

import os
import subprocess
import sys
import tempfile
import unittest

from tasks.regress_refactor import LegacyBehaviour, PureFunctions, RefactoredBehaviour  # noqa: F401

ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
SCRIPT = os.path.join(ROOT, "refactor-with-an-agent-characterization-tests.py")

LOG = ("2026-09-05 14:03:11 ERROR auth: token expired user=42\n"
       "2026-09-05 14:03:12 INFO auth: refreshed user=42\n"
       "garbage line without a timestamp\n"
       "2026-09-05 14:04:00 INFO web: GET /health 200\n"
       "2026-09-05 14:05:30 WARN db: slow query 1.2s\n")
EXPECTED_FIVE = ("WARN skipping line 3: 'garbage line without a timestamp'\n"
                 "lines: 5 (skipped 1)\n"
                 "  INFO     2\n"
                 "  ERROR    1\n"
                 "  WARN     1\n"
                 "first: 05/09/26 14:03:11\n"
                 "last:  05/09/26 14:05:30\n")


def cli(args, stdin=None):
    p = subprocess.run([sys.executable, SCRIPT, *args], cwd=ROOT, input=stdin,
                       capture_output=True, text=True, timeout=60)
    return p.returncode, p.stdout, p.stderr


class StdinTests(unittest.TestCase):
    def test_dash_reads_the_log_from_stdin(self):
        code, out, err = cli(["-"], stdin=LOG)
        self.assertEqual(code, 0, err)
        self.assertEqual(out, EXPECTED_FIVE)

    def test_dash_with_empty_stdin(self):
        code, out, err = cli(["-"], stdin="")
        self.assertEqual(code, 0, err)
        self.assertEqual(out, "lines: 0 (skipped 0)\n")

    def test_a_named_file_still_works(self):
        with tempfile.TemporaryDirectory() as tmp:
            path = os.path.join(tmp, "app.log")
            with open(path, "w", encoding="utf-8", newline="\n") as fh:
                fh.write(LOG)
            code, out, err = cli([path])
        self.assertEqual(code, 0, err)
        self.assertEqual(out, EXPECTED_FIVE)


if __name__ == "__main__":
    unittest.main()