"""SP41-visits: unit tests for ``cyclone.rebill.visits_store``.

The visits_store persists the AxisCare visits export to the ``visits``
table. These tests pin the loader and the read-back query helper.
"""
from __future__ import annotations

import csv
import tempfile
from datetime import date
from decimal import Decimal
from pathlib import Path

import pytest

from cyclone import db as db_mod
from cyclone.rebill.visits_store import (
    _normalize_modifiers,
    _parse_billed,
    _parse_dos,
    load_visits_csv,
    query_visits,
)


@pytest.fixture
def visits_csv(tmp_path: Path) -> Path:
    """Write a small visits CSV in AxisCare's shape."""
    csv_path = tmp_path / "visits.csv"
    with csv_path.open("w", newline="", encoding="utf-8") as f:
        writer = csv.writer(f)
        writer.writerow([
            "Client", "Visit Date", "Payer", "Authorized", "Member ID",
            "Auth Start Date", "Auth End Date", "Authorization #", "ICD-10",
            "Service", "Procedure Code", "Modifiers", "Client Classes",
            "Billable Hours", "Billable Amount", "Invoice #", "Claimed",
        ])
        writer.writerow([
            "Wilson, Michelle", "01/01/2026", "CO Medicaid", "Yes", "R649327",
            "01/01/2026", "12/31/2026", "3", "R69",
            "Homemaker S5150", "S5150", "U8", "DD Waiver", "1", "$212.77",
            "INV-2026-01-01-R649327", "Yes",
        ])
        writer.writerow([
            "O'Keefe , Laura", "05/09/2026", "COHCPF", "yes", "Y477643",
            "03/10/2026", "08/31/2026", "9", "R69",
            "IHSS PCP T1019", "T1019", "KX, SC, U2", "IHSS DR", "8.5333",
            "$237.57", "INV-2026-05-09-Y477643", "Yes",
        ])
        writer.writerow([
            "Stale, Old", "12/31/2025", "CO Medicaid", "Yes", "Z999999",
            "01/01/2025", "12/31/2025", "0", "R69",
            "Old S5150", "S5150", "U8", "DD Waiver", "1", "$100.00",
            "INV-2025-12-31-Z999999", "Yes",  # OUT-OF-WINDOW
        ])
    return csv_path


def test_normalize_modifiers():
    """Colon-joined or comma-joined input → colon-joined output."""
    assert _normalize_modifiers("KX:SC:U2") == "KX:SC:U2"
    assert _normalize_modifiers("KX, SC, U2") == "KX:SC:U2"
    assert _normalize_modifiers("") == ""
    assert _normalize_modifiers("U8") == "U8"


def test_parse_billed():
    """$ prefix and thousands separators are stripped."""
    assert _parse_billed("$212.77") == Decimal("212.77")
    assert _parse_billed("1,234.56") == Decimal("1234.56")
    assert _parse_billed("") == Decimal("0")
    assert _parse_billed("not a number") == Decimal("0")


def test_parse_dos():
    """MM/DD/YYYY primary, YYYY-MM-DD fallback."""
    assert _parse_dos("01/01/2026") == date(2026, 1, 1)
    assert _parse_dos("2026-01-01") == date(2026, 1, 1)
    assert _parse_dos("") is None
    assert _parse_dos("garbage") is None


def test_load_visits_csv_inserts_in_window_only(visits_csv: Path):
    """Out-of-window rows are dropped, in-window rows are inserted."""
    n = load_visits_csv(
        visits_csv,
        window_start=date(2026, 1, 1),
        window_end=date(2026, 6, 27),
    )
    # 2 of 3 rows are in-window (the 12/31/2025 row is dropped)
    assert n == 2

    rows = query_visits(dos_start=date(2026, 1, 1), dos_end=date(2026, 6, 27))
    assert len(rows) == 2
    member_ids = {r.member_id for r in rows}
    assert member_ids == {"R649327", "Y477643"}


def test_load_visits_csv_dedupes_on_natural_key(visits_csv: Path):
    """Re-running the loader must not insert duplicate (DOS, member, procedure, mod)."""
    load_visits_csv(visits_csv, window_start=date(2026, 1, 1), window_end=date(2026, 6, 27))
    n2 = load_visits_csv(visits_csv, window_start=date(2026, 1, 1), window_end=date(2026, 6, 27))
    assert n2 == 0  # all rows were already there
    assert len(query_visits()) == 2


def test_query_visits_filters_by_member_and_procedure(visits_csv: Path):
    load_visits_csv(visits_csv, window_start=date(2026, 1, 1), window_end=date(2026, 6, 27))
    rows = query_visits(member_id="R649327")
    assert len(rows) == 1
    assert rows[0].procedure_code == "S5150"
    assert rows[0].modifiers == "U8"
    assert rows[0].billed_amount == Decimal("212.77")
    assert rows[0].icd10 == "R69"
    assert rows[0].prior_auth == "3"
    assert rows[0].payer == "CO Medicaid"


def test_query_visits_modifiers_normalized_to_colon_joined(visits_csv: Path):
    """Batch-2 style 'KX, SC, U2' is stored as 'KX:SC:U2'."""
    load_visits_csv(visits_csv, window_start=date(2026, 1, 1), window_end=date(2026, 6, 27))
    rows = query_visits(member_id="Y477643")
    assert len(rows) == 1
    assert rows[0].modifiers == "KX:SC:U2"
    assert rows[0].procedure_code == "T1019"


def test_visit_table_exists_post_migration():
    """Migration 23 created the visits table — schema check."""
    db_mod.init_db()
    from sqlalchemy import inspect, text
    with db_mod.SessionLocal()() as s:
        v = s.execute(text("PRAGMA user_version")).scalar()
    inspector = inspect(db_mod.engine())
    assert "visits" in inspector.get_table_names()
    assert v >= 23