"""SP41 — tests for the `cyclone rebill-from-835` CLI.

Three smoke tests:
  1. --help renders cleanly and surfaces --window and --override-filing.
  2. --status (with no other args) renders cleanly and exits 0 — the
     option is recognized even when no prior summary.csv exists.
  3. End-to-end run against a 2-row visits CSV (one in-window, one
     ancient) and a zero-SVC 835 fixture produces a summary.csv with
     the in-window visit classified as REBILLED_B.
"""
from __future__ import annotations

import csv
from pathlib import Path

from click.testing import CliRunner

from cyclone.cli import main


def test_rebill_from_835_help():
    runner = CliRunner()
    result = runner.invoke(main, ["rebill-from-835", "--help"])
    assert result.exit_code == 0, result.output
    assert "--window" in result.output
    assert "--override-filing" in result.output


def test_rebill_from_835_status_help():
    """Either bare --status or --status --help should exit 0.

    The spec note: the help-test ensures the option is recognized, so
    even a "no prior runs" 0-exit path is acceptable. We try both
    invocations because click short-circuits --help ahead of any
    required-option check; the bare --status path is the one that
    proves --status works without --visits / --ingest.
    """
    runner = CliRunner()
    result_help = runner.invoke(main, ["rebill-from-835", "--status", "--help"])
    assert result_help.exit_code == 0, result_help.output

    result_bare = runner.invoke(main, ["rebill-from-835", "--status"])
    assert result_bare.exit_code == 0, result_bare.output


def test_rebill_from_835_runs(tmp_path: Path):
    """End-to-end: 1 in-window visit + 1 ancient visit + zero-SVC 835 → REBILLED_B for the in-window row."""
    visits_path = tmp_path / "visits.csv"
    visits_path.write_text(
        "Visit Date,Member ID,Procedure Code,Billable Amount\n"
        "06/27/2026,J813715,T1019,$2.32\n"
        "01/01/2020,ANCIENT,T1019,$2.32\n"
    )

    ingest_dir = tmp_path / "ingest"
    ingest_dir.mkdir()
    (ingest_dir / "x.835").write_text("ST*835*0001~SE*0*0001~")

    out_dir = tmp_path / "out"

    runner = CliRunner()
    result = runner.invoke(main, [
        "rebill-from-835",
        "--visits", str(visits_path),
        "--ingest", str(ingest_dir),
        "--out", str(out_dir),
        "--as-of", "2026-07-07",
    ])
    assert result.exit_code == 0, (
        f"CLI exited {result.exit_code}, output={result.output!r}, "
        f"exception={result.exception!r}"
    )

    summary_path = out_dir / "summary.csv"
    assert summary_path.exists(), summary_path

    with summary_path.open(newline="") as f:
        rows = list(csv.DictReader(f))
    # Two visits in, two summary rows out (one REBILLED_B, one
    # EXCLUDED_TIMELY_FILING). PAID outcomes would be dropped, but
    # neither of these is PAID — the 835 has no SVCs.
    assert len(rows) == 2, rows

    by_member = {r["member_id"]: r for r in rows}
    in_window = by_member["J813715"]
    assert in_window["disposition"] == "REBILLED_B", in_window
    assert in_window["dos"] == "2026-06-27", in_window

    ancient = by_member["ANCIENT"]
    assert ancient["disposition"] == "EXCLUDED_TIMELY_FILING", ancient
    assert ancient["dos"] == "2020-01-01", ancient