"""Tests for the 6 new GET endpoints."""

from __future__ import annotations

from pathlib import Path

import pytest
from fastapi.testclient import TestClient

from cyclone.api import app
from cyclone.store import store as global_store

FIXTURE_837 = Path(__file__).parent / "fixtures" / "co_medicaid_837p.txt"


@pytest.fixture(autouse=True)
def clear_store():
    with global_store._lock:
        global_store._batches.clear()
    yield
    with global_store._lock:
        global_store._batches.clear()


@pytest.fixture
def client() -> TestClient:
    return TestClient(app)


@pytest.fixture
def seeded_store():
    """One parsed 837P fixture batch."""
    text = FIXTURE_837.read_text()
    client = TestClient(app)
    client.post(
        "/api/parse-837",
        files={"file": ("x.txt", text, "text/plain")},
        headers={"Accept": "application/json"},
    )
    return client


JSON = {"Accept": "application/json"}


# --------------------------------------------------------------------------- #
# /api/batches
# --------------------------------------------------------------------------- #


def test_batches_returns_empty_list_when_no_parses(client: TestClient):
    resp = client.get("/api/batches", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()
    assert body == {"items": [], "total": 0, "returned": 0, "has_more": False}


def test_batches_returns_summary_after_parse(seeded_store):
    resp = seeded_store.get("/api/batches", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()
    assert body["total"] == 1
    assert body["returned"] == 1
    assert body["items"][0]["kind"] == "837p"
    assert body["items"][0]["inputFilename"] == "x.txt"


# --------------------------------------------------------------------------- #
# /api/batches/{id}
# --------------------------------------------------------------------------- #


def test_get_batch_by_id_returns_full_result(seeded_store):
    batches = seeded_store.get("/api/batches", headers=JSON).json()["items"]
    bid = batches[0]["id"]
    resp = seeded_store.get(f"/api/batches/{bid}")
    assert resp.status_code == 200
    body = resp.json()
    assert "envelope" in body
    assert "claims" in body
    assert len(body["claims"]) == 2


def test_get_batch_404_when_missing(client: TestClient):
    resp = client.get("/api/batches/does-not-exist")
    assert resp.status_code == 404


# --------------------------------------------------------------------------- #
# /api/claims
# --------------------------------------------------------------------------- #


def test_claims_returns_empty_list_when_no_parses(client: TestClient):
    resp = client.get("/api/claims", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()
    assert body["items"] == []
    assert body["total"] == 0


def test_claims_filters_by_status_submitted(seeded_store):
    resp = seeded_store.get("/api/claims?status=submitted", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()
    assert all(c["status"] == "submitted" for c in body["items"])
    assert body["total"] >= 1


def test_claims_filters_by_batch_id(seeded_store):
    bid = seeded_store.get("/api/batches", headers=JSON).json()["items"][0]["id"]
    resp = seeded_store.get(f"/api/claims?batch_id={bid}", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()
    assert all(c["batchId"] == bid for c in body["items"])


def test_claims_sorts_by_billed_amount_desc(seeded_store):
    resp = seeded_store.get("/api/claims?sort=billedAmount&order=desc", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()
    amounts = [c["billedAmount"] for c in body["items"]]
    assert amounts == sorted(amounts, reverse=True)


def test_claims_pagination_limit_offset(seeded_store):
    resp1 = seeded_store.get("/api/claims?limit=1&offset=0", headers=JSON)
    body1 = resp1.json()
    assert body1["returned"] == 1
    assert body1["has_more"] is True


# --------------------------------------------------------------------------- #
# /api/remittances
# --------------------------------------------------------------------------- #


def test_remittances_returns_empty_list_when_no_parses(client: TestClient):
    resp = client.get("/api/remittances", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()
    assert body["items"] == []


def test_remittances_filters_by_batch_id(seeded_store):
    """No 835 fixture parsed yet — but the endpoint should return 200 with empty."""
    resp = seeded_store.get("/api/remittances?batch_id=nope", headers=JSON)
    assert resp.status_code == 200
    assert resp.json()["items"] == []


# --------------------------------------------------------------------------- #
# /api/providers
# --------------------------------------------------------------------------- #


def test_providers_empty_when_no_parses(client: TestClient):
    resp = client.get("/api/providers", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()
    assert body["items"] == []


def test_providers_returns_one_per_distinct_npi(seeded_store):
    resp = seeded_store.get("/api/providers", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()
    assert len(body["items"]) == 1
    assert body["items"][0]["npi"] == "1881068062"


# --------------------------------------------------------------------------- #
# /api/activity
# --------------------------------------------------------------------------- #


def test_activity_empty_when_no_parses(client: TestClient):
    resp = client.get("/api/activity", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()
    assert body["items"] == []


def test_activity_returns_one_event_per_claim(seeded_store):
    resp = seeded_store.get("/api/activity", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()
    assert len(body["items"]) == 2  # co_medicaid_837p.txt has 2 claims
    assert all(e["kind"] == "claim_submitted" for e in body["items"])


# --------------------------------------------------------------------------- #
# NDJSON streaming on the list endpoints
# --------------------------------------------------------------------------- #


def _assert_ndjson_envelope(resp, expected_total: int) -> list[dict]:
    """Common helper: parse NDJSON body, return the item payloads."""
    import json as _json
    assert resp.status_code == 200
    assert resp.headers["content-type"].startswith("application/x-ndjson"), resp.headers
    lines = [l for l in resp.text.split("\n") if l.strip()]
    events = [_json.loads(l) for l in lines]
    items = [e["data"] for e in events if e["type"] == "item"]
    summaries = [e for e in events if e["type"] == "summary"]
    assert len(summaries) == 1, events
    s = summaries[0]["data"]
    assert s["total"] == expected_total
    assert s["returned"] == len(items)
    return items


def test_batches_ndjson_returns_parseable_lines(seeded_store):
    resp = seeded_store.get(
        "/api/batches",
        headers={"Accept": "application/x-ndjson"},
    )
    items = _assert_ndjson_envelope(resp, expected_total=1)
    assert len(items) == 1
    assert items[0]["kind"] == "837p"


def test_claims_ndjson_returns_parseable_lines(seeded_store):
    resp = seeded_store.get(
        "/api/claims",
        headers={"Accept": "application/x-ndjson"},
    )
    items = _assert_ndjson_envelope(resp, expected_total=2)
    assert len(items) == 2


def test_remittances_ndjson_returns_parseable_lines(seeded_store):
    resp = seeded_store.get(
        "/api/remittances",
        headers={"Accept": "application/x-ndjson"},
    )
    # 0 batches parsed, 0 remits
    _assert_ndjson_envelope(resp, expected_total=0)


def test_providers_ndjson_returns_parseable_lines(seeded_store):
    resp = seeded_store.get(
        "/api/providers",
        headers={"Accept": "application/x-ndjson"},
    )
    items = _assert_ndjson_envelope(resp, expected_total=1)
    assert items[0]["npi"] == "1881068062"


def test_activity_ndjson_returns_parseable_lines(seeded_store):
    resp = seeded_store.get(
        "/api/activity",
        headers={"Accept": "application/x-ndjson"},
    )
    items = _assert_ndjson_envelope(resp, expected_total=2)
    assert all(it["kind"] == "claim_submitted" for it in items)


def test_claims_json_default_wraps_in_envelope(seeded_store):
    """Accept: application/json → wrapped JSON response (items/total/returned/has_more)."""
    resp = seeded_store.get(
        "/api/claims",
        headers={"Accept": "application/json"},
    )
    assert resp.status_code == 200
    body = resp.json()
    assert set(body.keys()) == {"items", "total", "returned", "has_more"}
    assert body["total"] == 2
    assert body["returned"] == 2


def test_claims_ndjson_wins_over_json_when_both_accepted(seeded_store):
    """When both NDJSON and JSON are in Accept, the explicit NDJSON hint wins."""
    resp = seeded_store.get(
        "/api/claims",
        headers={"Accept": "application/x-ndjson, application/json"},
    )
    assert resp.headers["content-type"].startswith("application/x-ndjson")


def test_claims_default_accept_returns_json(seeded_store):
    """No Accept header → JSON envelope (per spec 6.2: JSON is the default for
    list endpoints; NDJSON is the opt-in)."""
    resp = seeded_store.get("/api/claims")
    body = resp.json()
    assert "items" in body
    assert "total" in body
    assert "returned" in body
    assert "has_more" in body


# --------------------------------------------------------------------------- #
# /api/reconciliation/unmatched (T14)
# --------------------------------------------------------------------------- #


def test_get_reconciliation_unmatched_empty(client: TestClient):
    """With no parsed batches, both sides of the unmatched list are empty."""
    resp = client.get("/api/reconciliation/unmatched")
    assert resp.status_code == 200
    assert resp.json() == {"claims": [], "remittances": []}


def test_get_reconciliation_unmatched_returns_orphans(client: TestClient):
    """An unmatched Claim (left) and an unmatched Remittance (right) both surface.

    The 837 subscriber's ``member_id="M1"`` intentionally differs from the
    835 remit's ``payer_claim_control_number="PCN-OTHER"`` so the auto-matcher
    in ``reconcile.run`` does not pair them on ingest — we want them to land
    in the unmatched list so the endpoint has something to return.
    """
    from datetime import date, datetime, timezone
    from decimal import Decimal

    from cyclone.parsers.models import (
        BatchSummary, BillingProvider, ClaimHeader, ClaimOutput,
        Envelope, Payer, ParseResult, Subscriber, ValidationReport,
    )
    from cyclone.parsers.models_835 import (
        BatchSummary as BatchSummary835,
        ClaimPayment, Envelope as Envelope835,
        FinancialInfo, Payer835, ParseResult835, Payee835,
        ReassociationTrace,
    )
    from cyclone.store import BatchRecord837, BatchRecord835

    # Add a single 837 Claim. member_id="M1" so PCN-based auto-match won't pair it.
    co = ClaimOutput(
        claim_id="CLM-1",
        control_number="0001",
        transaction_date=date(2026, 6, 19),
        billing_provider=BillingProvider(name="Test", npi="1234567890"),
        subscriber=Subscriber(
            first_name="Jane", last_name="Doe", member_id="M1",
        ),
        payer=Payer(name="Test Payer", id="P1"),
        claim=ClaimHeader(
            claim_id="CLM-1", total_charge=Decimal("100"),
            frequency_code="1", place_of_service="11",
        ),
        diagnoses=[],
        service_lines=[],
        validation=ValidationReport(passed=True, errors=[], warnings=[]),
        raw_segments=[],
    )
    global_store.add(BatchRecord837(
        id="b-837", kind="837p", input_filename="c.txt",
        parsed_at=datetime(2026, 6, 19, 12, 0, tzinfo=timezone.utc),
        result=ParseResult(
            claims=[co],
            summary=BatchSummary(
                input_file="c.txt", control_number="0001",
                transaction_date=date(2026, 6, 19),
                total_claims=1, passed=1, failed=0,
            ),
        ),
    ))

    # Add a single 835 Remittance with PCN="PCN-OTHER" (won't auto-match "M1").
    cp = ClaimPayment(
        payer_claim_control_number="PCN-OTHER",
        status_code="1",
        total_charge=Decimal("50"), total_paid=Decimal("50"),
        service_payments=[],
    )
    global_store.add(BatchRecord835(
        id="b-835", kind="835", input_filename="e.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("0"),
                credit_debit_flag="C", payment_method=None,
            ),
            trace=ReassociationTrace(
                trace_type_code="1", trace_number="0001",
                originating_company_id="S",
            ),
            payer=Payer835(name="X", id="SKCO0"),
            payee=Payee835(name="Y", npi="1234567890"),
            claims=[cp],
            summary=BatchSummary835(
                input_file="e.txt", control_number="0001",
                transaction_date=date(2026, 6, 19),
                total_claims=1, passed=1, failed=0,
            ),
        ),
    ))

    resp = client.get("/api/reconciliation/unmatched")
    assert resp.status_code == 200
    body = resp.json()
    assert len(body["claims"]) == 1
    assert body["claims"][0]["id"] == "CLM-1"
    assert len(body["remittances"]) == 1
    assert body["remittances"][0]["payerClaimControlNumber"] == "PCN-OTHER"