"""Claim-id dedup at the SFTP pre-flight stage."""
from datetime import datetime, timezone
from pathlib import Path
from unittest.mock import MagicMock

import pytest

from cyclone.submission.core import submit_file
from cyclone.store.exceptions import DuplicateClaimError
from cyclone.store.submission_dedup import (
    record_submission,
    check_duplicate,
    DEFAULT_WINDOW_DAYS,
)

# Fixture file with a single CLM01 = "CLM001" claim (the minimal_837p
# fixture is the source of truth; duplicated into submit-batch/single-claim.x12
# but both byte-equal so we pick the canonical minimal path here).
_FIXTURE = Path(__file__).parent / "fixtures" / "minimal_837p.txt"
_FIXTURE_CLAIM_ID = "CLM001"


def test_check_duplicate_returns_none_for_first_submission(tmp_path):
    db = tmp_path / "test.db"
    assert check_duplicate("ORIG-001", db_url=f"sqlite:///{db}") is None


def test_check_duplicate_raises_within_window(tmp_path):
    db = tmp_path / "test.db"
    record_submission("ORIG-002", submitted_at=datetime(2026, 6, 1), db_url=f"sqlite:///{db}")
    try:
        check_duplicate("ORIG-002", db_url=f"sqlite:///{db}",
                       now=datetime(2026, 6, 15))
    except DuplicateClaimError as e:
        assert e.claim_id == "ORIG-002"
        assert e.original_submission_at == datetime(2026, 6, 1)
    else:
        raise AssertionError("expected DuplicateClaimError")


def test_check_duplicate_passes_after_window(tmp_path):
    db = tmp_path / "test.db"
    record_submission("ORIG-003", submitted_at=datetime(2026, 1, 1), db_url=f"sqlite:///{db}")
    # 100 days later — past the 30-day default window
    assert check_duplicate("ORIG-003", db_url=f"sqlite:///{db}",
                          now=datetime(2026, 4, 11)) is None


def test_default_window_is_30_days():
    assert DEFAULT_WINDOW_DAYS == 30


# --------------------------------------------------------------------------- #
# SP41 Task 9 integration: dedup guard wired into submit_file pre-flight.
# --------------------------------------------------------------------------- #


def test_submit_file_raises_on_duplicate_claim_id(tmp_path):
    """``submit_file`` raises ``DuplicateClaimError`` if any CLM01 in the
    file was submitted within the 30-day dedup window, and the DB write
    + SFTP factory are both skipped.

    Mirrors the DB-first, upload-second invariant from ``submit_file``:
    the dedup check sits between the payer-mismatch guard and the
    BatchRecord837 DB write, so a duplicate blocks both the DB write
    AND the SFTP upload. This test pins both invariants.

    The conftest autouse fixture wires a fresh per-test SQLite DB at
    ``tmp_path/test.db`` via the ``CYCLONE_DB_URL`` env var (so
    ``cycl_db.SessionLocal()`` points there) — same engine the Batch
    write would use, same engine the dedup helper reads.
    """
    # 1. Pre-populate the dedup table with the claim_id from the
    #    fixture at a timestamp within the 30-day window. ``db_url``
    #    is ignored inside the helper (signature-preserving shim) but
    #    the argument is required by the current Task 8 signature, so
    #    we pass the per-test DB URL for clarity.
    record_submission(
        _FIXTURE_CLAIM_ID,
        submitted_at=datetime.now(timezone.utc),
        db_url=f"sqlite:///{tmp_path}/test.db",
    )

    # 2. Sentinel: if submit_file reaches the SFTP factory call,
    #    fail loudly. ``submit_file`` raises DuplicateClaimError
    #    BEFORE the factory is invoked, so the AssertionError here
    #    only fires if the dedup guard is bypassed (regression).
    def _sftp_factory(_block):  # pragma: no cover - regression only
        raise AssertionError(
            "SFTP factory must not be called when dedup blocks submit_file"
        )

    sftp_block = MagicMock(stub=False, paths={"outbound": "/ToHPE"})

    # 3. Expect the 409-class domain exception with structured
    #    ``claim_id`` / ``original_submission_at`` attributes so the
    #    operator can see which CLM01 tripped the guard.
    with pytest.raises(DuplicateClaimError) as exc_info:
        submit_file(
            _FIXTURE,
            sftp_block=sftp_block,
            actor="test",
            validate=True,
            sftp_client_factory=_sftp_factory,
        )
    assert exc_info.value.claim_id == _FIXTURE_CLAIM_ID
    assert exc_info.value.original_submission_at is not None

    # 4. DB invariant: no Batch row was written (dedup blocks the
    #    DB write, not just the SFTP upload). The autouse fixture
    #    points cycl_db at tmp_path/test.db, so a fresh
    #    ``db_mod.SessionLocal()()`` re-opens it.
    from cyclone import db as db_mod

    with db_mod.SessionLocal()() as session:
        batch_count = session.query(db_mod.Batch).count()
    assert batch_count == 0, (
        "dedup guard must block the BatchRecord837 DB write; "
        f"found {batch_count} Batch row(s)"
    )