feat(parsers+api+ui): expose CARC-labeled CAS adjustments (SP3 P2)

backend/tests/test_api_gets.py

@@ -637,3 +637,172 @@ def test_post_unmatch_removes_match(client: TestClient):
     assert body["claim"]["matchedRemittanceId"] is None
     # No Match rows existed before the call → 0 deleted.
     assert body["deletedMatches"] == 0
+
+
+# --------------------------------------------------------------------------- #
+# /api/remittances/{remittance_id} (T7 / SP3 P2)
+# --------------------------------------------------------------------------- #
+
+
+def test_get_remittance_404_when_missing(client: TestClient) -> None:
+    """A missing remittance returns 404 (not 500)."""
+    resp = client.get("/api/remittances/does-not-exist")
+    assert resp.status_code == 404
+
+
+def _seed_835_remittance(
+    *,
+    pcns: list[str],
+    cas_rows: dict[str, list[tuple[str, str, str, str]]] | None = None,
+    status_code: str = "1",
+    total_charge: str = "100",
+    total_paid: str = "100",
+) -> None:
+    """Helper: insert one 835 batch with one ClaimPayment per PCN.
+
+    ``cas_rows`` maps ``pcn -> [(group, reason, amount, qty_or_None), ...]``
+    so a single CAS row maps cleanly to ``CasAdjustment``.
+    """
+    from datetime import date, datetime, timezone
+    from decimal import Decimal
+
+    from cyclone.parsers.models_835 import (
+        BatchSummary as BatchSummary835,
+        ClaimAdjustment as ClaimAdjustment835,
+        ClaimPayment,
+        Envelope as Envelope835,
+        FinancialInfo,
+        Payer835,
+        ParseResult835,
+        Payee835,
+        ReassociationTrace,
+        ServicePayment,
+    )
+    from cyclone.store import BatchRecord835
+
+    claims = []
+    for pcn in pcns:
+        adjustments: list[ClaimAdjustment835] = []
+        rows = (cas_rows or {}).get(pcn, [])
+        for group, reason, amount, qty in rows:
+            adjustments.append(ClaimAdjustment835(
+                group_code=group, reason_code=reason,
+                amount=Decimal(amount),
+                quantity=Decimal(qty) if qty else None,
+            ))
+        sp = ServicePayment(
+            line_number=1,
+            procedure_qualifier="HC",
+            procedure_code="T1019",
+            modifiers=[],
+            charge=Decimal(total_charge),
+            payment=Decimal(total_paid),
+            units=Decimal("1"),
+            unit_type="UN",
+            adjustments=adjustments,
+        )
+        claims.append(ClaimPayment(
+            payer_claim_control_number=pcn,
+            status_code=status_code,
+            total_charge=Decimal(total_charge),
+            total_paid=Decimal(total_paid),
+            service_payments=[sp] if rows else [],
+        ))
+
+    global_store.add(BatchRecord835(
+        id=f"b-835-{pcns[0]}", kind="835", input_filename="era.txt",
+        parsed_at=datetime(2026, 6, 19, 12, 5, tzinfo=timezone.utc),
+        result=ParseResult835(
+            envelope=Envelope835(
+                sender_id="S", receiver_id="R", control_number="0001",
+                transaction_date=date(2026, 6, 19),
+            ),
+            financial_info=FinancialInfo(
+                handling_code="C", paid_amount=Decimal(total_paid),
+                credit_debit_flag="C", payment_method=None,
+            ),
+            trace=ReassociationTrace(
+                trace_type_code="1", trace_number="0001",
+                originating_company_id="S",
+            ),
+            payer=Payer835(name="Colorado Medicaid", id="SKCO0"),
+            payee=Payee835(name="TOC, Inc.", npi="1881068062"),
+            claims=claims,
+            summary=BatchSummary835(
+                input_file="era.txt", control_number="0001",
+                transaction_date=date(2026, 6, 19),
+                total_claims=len(claims), passed=len(claims), failed=0,
+            ),
+        ),
+    ))
+
+
+def test_get_remittance_with_empty_adjustments(client: TestClient) -> None:
+    """A remittance with no CAS rows returns ``adjustments == []``."""
+    _seed_835_remittance(pcns=["PCN-EMPTY"])
+    resp = client.get("/api/remittances/PCN-EMPTY")
+    assert resp.status_code == 200, resp.text
+    body = resp.json()
+    assert body["id"] == "PCN-EMPTY"
+    assert body["adjustments"] == []
+
+
+def test_get_remittance_with_adjustments_returns_labeled(client: TestClient) -> None:
+    """A remittance with two CAS rows surfaces both with the correct labels.
+
+    Seeds CO-45 (the fee-schedule code) and PR-1 (deductible) so we
+    exercise both a CO group code and a PR group code, plus both a
+    quantified and non-quantified row.
+    """
+    _seed_835_remittance(
+        pcns=["PCN-LABELED"],
+        cas_rows={
+            "PCN-LABELED": [
+                ("CO", "45", "50.00", ""),     # no quantity
+                ("PR", "1",  "10.00", "1"),    # quantified
+            ],
+        },
+    )
+    resp = client.get("/api/remittances/PCN-LABELED")
+    assert resp.status_code == 200, resp.text
+    body = resp.json()
+    assert body["id"] == "PCN-LABELED"
+    adjs = body["adjustments"]
+    assert len(adjs) == 2
+
+    by_key = {(a["group"], a["reason"]): a for a in adjs}
+    assert ("CO", "45") in by_key
+    assert ("PR", "1") in by_key
+
+    co45 = by_key[("CO", "45")]
+    assert co45["amount"] == 50.00
+    assert co45["quantity"] is None
+    # Label is non-empty and isn't the "Unknown" fallback (both are in the dict).
+    assert co45["label"] and "Unknown" not in co45["label"]
+
+    pr1 = by_key[("PR", "1")]
+    assert pr1["amount"] == 10.00
+    assert pr1["quantity"] == 1
+    assert pr1["label"] and "Unknown" not in pr1["label"]
+
+    # The CO and PR rows must have distinct labels (different codes → different meanings).
+    assert co45["label"] != pr1["label"]
+
+
+def test_get_remittance_basic_fields_preserved(client: TestClient) -> None:
+    """claimId, payerName, paidAmount, status all surface unchanged."""
+    _seed_835_remittance(
+        pcns=["PCN-FIELDS"],
+        cas_rows={"PCN-FIELDS": [("CO", "45", "12.34", "")]},
+        total_paid="75.50",
+    )
+    resp = client.get("/api/remittances/PCN-FIELDS")
+    assert resp.status_code == 200, resp.text
+    body = resp.json()
+    assert body["id"] == "PCN-FIELDS"
+    assert body["payerName"] == "Colorado Medicaid"
+    assert body["paidAmount"] == 75.50
+    assert body["status"] == "received"
+    assert body["batchId"]  # populated; not pinned to a specific value
+    assert body["receivedDate"]  # populated
+    assert body["parsedAt"]  # populated