"""Tests for ``GET /api/dashboard/summary`` (SP10 — Dashboard aggregates)."""

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"}


# --------------------------------------------------------------------------- #
# Empty state
# --------------------------------------------------------------------------- #


def test_dashboard_summary_empty_when_no_parses(client: TestClient):
    resp = client.get("/api/dashboard/summary", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()

    assert body["kpis"] == {
        "claimCount": 0,
        "billedTotal": 0.0,
        "receivedTotal": 0.0,
        "outstandingAr": 0.0,
        "deniedCount": 0,
        "pendingCount": 0,
        "denialRate": 0.0,
    }
    # Default window is 6 months; with no claims every bucket is empty
    # but still present so the sparkline renders zeros consistently.
    assert len(body["monthly"]) == 6
    for bucket in body["monthly"]:
        assert bucket["count"] == 0
        assert bucket["billed"] == 0.0
        assert bucket["received"] == 0.0
        assert bucket["denied"] == 0
        assert bucket["ar"] == 0.0
        assert bucket["denialRate"] == 0.0
    assert body["topProviders"] == []
    assert body["recentDenials"] == []
    assert body["providerCount"] == 0
    # asOf is a UTC ISO string.
    assert body["asOf"].endswith("Z")


# --------------------------------------------------------------------------- #
# Populated state — uses the 2-claim co_medicaid fixture
# --------------------------------------------------------------------------- #


def test_dashboard_summary_after_one_parse(seeded_store):
    resp = seeded_store.get("/api/dashboard/summary", headers=JSON)
    assert resp.status_code == 200
    body = resp.json()

    # The fixture has 2 claims, both submitted, billed $85.40 + $155.76.
    kpis = body["kpis"]
    assert kpis["claimCount"] == 2
    assert kpis["billedTotal"] == pytest.approx(85.40 + 155.76)
    assert kpis["receivedTotal"] == 0.0
    assert kpis["outstandingAr"] == pytest.approx(85.40 + 155.76)
    assert kpis["deniedCount"] == 0
    assert kpis["pendingCount"] == 2
    assert kpis["denialRate"] == 0.0

    # Default monthly window is 6 months; all claims are in the current
    # month (parsed today) so the other 5 buckets are zeros.
    assert len(body["monthly"]) == 6
    current = body["monthly"][-1]
    assert current["count"] == 2
    assert current["billed"] == pytest.approx(85.40 + 155.76)
    assert current["denied"] == 0

    # The earlier buckets should be empty (count=0, billed=0).
    for bucket in body["monthly"][:-1]:
        assert bucket["count"] == 0
        assert bucket["billed"] == 0.0

    # One distinct provider (TOC, Inc. — NPI 1881068062).
    assert body["providerCount"] == 1
    assert len(body["topProviders"]) == 1
    assert body["topProviders"][0]["npi"] == "1881068062"
    assert body["topProviders"][0]["claimCount"] == 2

    # No denials in this fixture.
    assert body["recentDenials"] == []


# --------------------------------------------------------------------------- #
# months param
# --------------------------------------------------------------------------- #


def test_dashboard_summary_months_param(client: TestClient):
    resp = client.get("/api/dashboard/summary?months=3", headers=JSON)
    assert resp.status_code == 200
    assert len(resp.json()["monthly"]) == 3


def test_dashboard_summary_months_param_min_max(client: TestClient):
    # Floor is 1.
    r = client.get("/api/dashboard/summary?months=1", headers=JSON)
    assert r.status_code == 200
    assert len(r.json()["monthly"]) == 1

    # Ceiling is 24.
    r = client.get("/api/dashboard/summary?months=24", headers=JSON)
    assert r.status_code == 200
    assert len(r.json()["monthly"]) == 24

    # Out of range → 422.
    r = client.get("/api/dashboard/summary?months=0", headers=JSON)
    assert r.status_code == 422
    r = client.get("/api/dashboard/summary?months=25", headers=JSON)
    assert r.status_code == 422


# --------------------------------------------------------------------------- #
# top_providers param
# --------------------------------------------------------------------------- #


def test_dashboard_summary_top_providers_param(seeded_store):
    resp = seeded_store.get(
        "/api/dashboard/summary?top_providers=1", headers=JSON
    )
    assert resp.status_code == 200
    body = resp.json()
    assert len(body["topProviders"]) == 1
    # providerCount is independent of topProviders.
    assert body["providerCount"] == 1


# --------------------------------------------------------------------------- #
# Recent denials only contain denied claims
# --------------------------------------------------------------------------- #


def test_dashboard_summary_recent_denials_empty_when_no_denied(seeded_store):
    """Fixture has 2 submitted claims, 0 denied. recentDenials: []."""
    body = seeded_store.get("/api/dashboard/summary", headers=JSON).json()
    assert body["kpis"]["deniedCount"] == 0
    assert body["recentDenials"] == []


# --------------------------------------------------------------------------- #
# Monthly buckets walk oldest → newest and the running AR is cumulative
# --------------------------------------------------------------------------- #


def test_dashboard_summary_monthly_chronological_and_labels(seeded_store):
    body = seeded_store.get("/api/dashboard/summary", headers=JSON).json()
    months = body["monthly"]
    assert len(months) == 6
    # Labels are short English month names (e.g. "Jan", "Feb").
    for bucket in months:
        assert len(bucket["label"]) == 3
        assert bucket["label"][0].isupper()
    # `month` strings sort in the same order the buckets appear.
    keys = [b["month"] for b in months]
    assert keys == sorted(keys)
    # Running AR never goes negative (clamped at 0).
    assert all(b["ar"] >= 0 for b in months)
    # Today's bucket is the last one and has the running AR equal to the
    # outstandingAr KPI (no received amounts yet in this fixture).
    assert months[-1]["ar"] == pytest.approx(body["kpis"]["outstandingAr"])


# --------------------------------------------------------------------------- #
# Store-level aggregation (called by the endpoint)
# --------------------------------------------------------------------------- #


def test_store_get_dashboard_summary_directly():
    """Call the Store method without going through the API."""
    from cyclone.store import store

    summary = store.get_dashboard_summary(months=6, top_providers=4, denials=5)
    # All claims come from the seeded fixture if any; we just assert the
    # shape here so the endpoint and Store stay in sync.
    assert set(summary.keys()) == {
        "kpis", "monthly", "topProviders", "recentDenials",
        "providerCount", "asOf",
    }
    assert set(summary["kpis"].keys()) == {
        "claimCount", "billedTotal", "receivedTotal", "outstandingAr",
        "deniedCount", "pendingCount", "denialRate",
    }
    assert set(summary["monthly"][0].keys()) == {
        "month", "label", "count", "billed", "received", "denied",
        "ar", "denialRate",
    }
    # Default window is 6 months even when called with explicit defaults.
    assert len(summary["monthly"]) == 6