"""Integrationstests: Posten anlegen, Fälligkeiten abrufen, bestätigen, Monatsreport."""

from httpx import AsyncClient


async def anlegen(client: AsyncClient, seeded: dict, **overrides) -> dict:
    """Legt ein Abo an; einzelne Felder lassen sich überschreiben."""
    payload = {
        "kind": "expense",
        "title": "Netflix Standard",
        "category_id": seeded["streaming"],
        "account_id": seeded["account_id"],
        "amount": "13.99",
        "rrule": "FREQ=MONTHLY;BYMONTHDAY=15",
        "dtstart": "2026-01-15",
        "business_day_shift": "none",
    }
    payload.update(overrides)
    antwort = await client.post("/api/recurrences", json=payload)
    assert antwort.status_code == 201, antwort.text
    return antwort.json()


# --- Der geforderte Durchstich -------------------------------------------------


async def test_durchstich_anlegen_abrufen_bestaetigen_report(
    auth_client: AsyncClient, seeded: dict
) -> None:
    """Recurrence anlegen → Fälligkeiten abrufen → mit abweichendem Betrag
    bestätigen → der Monatsreport weist das Ist aus."""
    posten = await anlegen(auth_client, seeded)
    assert posten["amount"] == "13.99"
    assert len(posten["amount_versions"]) == 1
    assert posten["annual_burden"] == "167.88"  # zwölf Monate à 13,99

    # Fälligkeiten des ersten Quartals abrufen.
    faelligkeiten = (
        await auth_client.get("/api/occurrences", params={"from": "2026-01-01", "to": "2026-03-31"})
    ).json()
    assert [item["nominal_date"] for item in faelligkeiten] == [
        "2026-01-15",
        "2026-02-15",
        "2026-03-15",
    ]
    assert all(item["status"] == "planned" for item in faelligkeiten)
    assert all(item["occurrence_id"] is None for item in faelligkeiten)

    # Februar mit abweichendem Betrag und Datum bestätigen.
    bestaetigt = await auth_client.post(
        "/api/occurrences/confirm",
        json={
            "recurrence_id": posten["id"],
            "occurrence_date": "2026-02-15",
            "actual_amount": "15.49",
            "actual_date": "2026-02-17",
            "note": "Preis erhöht",
        },
    )
    assert bestaetigt.status_code == 200
    body = bestaetigt.json()
    assert body["status"] == "confirmed"
    assert body["amount"] == "13.99"  # Soll bleibt stehen
    assert body["actual_amount"] == "15.49"
    assert body["effective_amount"] == "15.49"
    assert body["effective_date"] == "2026-02-17"
    assert body["occurrence_id"] is not None

    # Der Monatsreport weist Soll und Ist getrennt aus.
    report = (await auth_client.get("/api/reports/month", params={"month": "2026-02-01"})).json()
    assert report["month"] == "2026-02-01"
    assert report["planned"]["expenses"] == "13.99"
    assert report["actual"]["expenses"] == "15.49"
    assert report["confirmed_count"] == 1
    assert report["open_count"] == 0

    # Im Januar ist nichts bestätigt – dort bleibt das Ist leer.
    januar = (await auth_client.get("/api/reports/month", params={"month": "2026-01-01"})).json()
    assert januar["planned"]["expenses"] == "13.99"
    assert januar["actual"]["expenses"] == "0.00"
    assert januar["open_count"] == 1


async def test_report_verrechnet_einkuenfte_und_fixkosten(
    auth_client: AsyncClient, seeded: dict
) -> None:
    await anlegen(
        auth_client,
        seeded,
        title="Gehalt",
        kind="income",
        category_id=seeded["gehalt"],
        amount="3200.00",
        rrule="FREQ=MONTHLY;BYMONTHDAY=28",
        dtstart="2026-01-28",
    )
    await anlegen(
        auth_client,
        seeded,
        title="Miete",
        category_id=seeded["miete"],
        amount="950.00",
        rrule="FREQ=MONTHLY;BYMONTHDAY=1",
        dtstart="2026-01-01",
    )
    await anlegen(auth_client, seeded)  # Netflix – Abos zählen laut Seed als Fixkosten
    await anlegen(
        auth_client,
        seeded,
        title="Wocheneinkauf",
        category_id=seeded["lebensmittel"],
        amount="120.00",
        rrule="FREQ=MONTHLY;BYMONTHDAY=5",
        dtstart="2026-01-05",
        is_variable=True,
    )

    report = (await auth_client.get("/api/reports/month", params={"month": "2026-03-10"})).json()

    assert report["planned"]["income"] == "3200.00"
    assert report["planned"]["expenses"] == "1083.99"
    assert report["planned"]["balance"] == "2116.01"
    # Miete und Netflix sind Fixkostenkategorien, Lebensmittel nicht.
    assert report["fixed_costs"] == "963.99"
    assert report["variable_costs"] == "120.00"
    assert report["available_after_fixed"] == "2236.01"


async def test_report_vergleicht_mit_dem_vormonat(auth_client: AsyncClient, seeded: dict) -> None:
    posten = await anlegen(auth_client, seeded, amount="10.00")
    await auth_client.post(
        f"/api/recurrences/{posten['id']}/amount-versions",
        json={"amount": "20.00", "valid_from": "2026-03-01"},
    )

    report = (await auth_client.get("/api/reports/month", params={"month": "2026-03-01"})).json()

    assert report["planned"]["expenses"] == "20.00"
    assert report["previous_planned"]["expenses"] == "10.00"
    assert report["delta_to_previous"]["expenses"] == "10.00"
    assert report["delta_to_previous"]["balance"] == "-10.00"


# --- Anlegen und Prüfen --------------------------------------------------------


async def test_ungueltige_rrule_wird_abgewiesen(auth_client: AsyncClient, seeded: dict) -> None:
    antwort = await auth_client.post(
        "/api/recurrences",
        json={
            "kind": "expense",
            "title": "Kaputt",
            "category_id": seeded["streaming"],
            "account_id": seeded["account_id"],
            "amount": "5.00",
            "rrule": "FREQ=QUARTERLY",
            "dtstart": "2026-01-01",
        },
    )

    assert antwort.status_code == 422
    assert antwort.json()["code"] == "validation_error"


async def test_dtstart_in_der_rrule_wird_abgewiesen(auth_client: AsyncClient, seeded: dict) -> None:
    antwort = await auth_client.post(
        "/api/recurrences",
        json={
            "kind": "expense",
            "title": "Mit DTSTART",
            "category_id": seeded["streaming"],
            "account_id": seeded["account_id"],
            "amount": "5.00",
            "rrule": "DTSTART=20260101;FREQ=MONTHLY",
            "dtstart": "2026-01-01",
        },
    )
    assert antwort.status_code == 422


async def test_falsche_kategorierichtung_wird_abgewiesen(
    auth_client: AsyncClient, seeded: dict
) -> None:
    antwort = await auth_client.post(
        "/api/recurrences",
        json={
            "kind": "income",
            "title": "Gehalt in Ausgabenkategorie",
            "category_id": seeded["streaming"],
            "account_id": seeded["account_id"],
            "amount": "3000.00",
            "rrule": "FREQ=MONTHLY",
            "dtstart": "2026-01-01",
        },
    )

    assert antwort.status_code == 422
    assert antwort.json()["code"] == "category_kind_mismatch"


async def test_negativer_betrag_wird_abgewiesen(auth_client: AsyncClient, seeded: dict) -> None:
    antwort = await auth_client.post(
        "/api/recurrences",
        json={
            "kind": "expense",
            "title": "Negativ",
            "category_id": seeded["streaming"],
            "account_id": seeded["account_id"],
            "amount": "-5.00",
            "rrule": "FREQ=MONTHLY",
            "dtstart": "2026-01-01",
        },
    )
    assert antwort.status_code == 422


# --- Preisversionen ------------------------------------------------------------


async def test_preisversion_wirkt_ab_dem_stichtag(auth_client: AsyncClient, seeded: dict) -> None:
    posten = await anlegen(auth_client, seeded, amount="9.99")

    await auth_client.post(
        f"/api/recurrences/{posten['id']}/amount-versions",
        json={"amount": "13.99", "valid_from": "2026-04-01", "note": "Preiserhöhung"},
    )

    vorschau = (
        await auth_client.get(
            f"/api/recurrences/{posten['id']}/preview",
            params={"from": "2026-01-01", "to": "2026-06-30"},
        )
    ).json()

    betraege = {item["nominal_date"]: item["amount"] for item in vorschau}
    assert betraege["2026-03-15"] == "9.99"
    assert betraege["2026-04-15"] == "13.99"

    # Der Basisbetrag folgt der jüngsten Version.
    detail = (await auth_client.get(f"/api/recurrences/{posten['id']}")).json()
    assert detail["amount"] == "13.99"
    assert len(detail["amount_versions"]) == 2


async def test_doppelte_preisversion_wird_abgewiesen(
    auth_client: AsyncClient, seeded: dict
) -> None:
    posten = await anlegen(auth_client, seeded)

    antwort = await auth_client.post(
        f"/api/recurrences/{posten['id']}/amount-versions",
        json={"amount": "20.00", "valid_from": "2026-01-15"},
    )
    assert antwort.status_code == 409


# --- Vorschau, Raten, Verträge -------------------------------------------------


async def test_vorschau_liefert_die_naechsten_termine(
    auth_client: AsyncClient, seeded: dict
) -> None:
    posten = await anlegen(auth_client, seeded)

    vorschau = (
        await auth_client.get(
            f"/api/recurrences/{posten['id']}/preview",
            params={"from": "2026-01-01", "to": "2026-03-31"},
        )
    ).json()

    assert [item["nominal_date"] for item in vorschau] == [
        "2026-01-15",
        "2026-02-15",
        "2026-03-15",
    ]
    assert vorschau[0]["recurrence_title"] == "Netflix Standard"


async def test_kredit_zeigt_restschuld_und_raten(auth_client: AsyncClient, seeded: dict) -> None:
    posten = await anlegen(
        auth_client,
        seeded,
        title="Autokredit",
        category_id=seeded["kredite"],
        amount="250.00",
        rrule="FREQ=MONTHLY;BYMONTHDAY=1",
        dtstart="2026-01-01",
        installments_total=36,
        principal_amount="9000.00",
    )

    assert posten["installments"]["total"] == 36
    assert posten["installments"]["final_due_date"] == "2028-12-01"

    vorschau = (
        await auth_client.get(
            f"/api/recurrences/{posten['id']}/preview",
            params={"from": "2026-01-01", "to": "2032-12-31"},
        )
    ).json()
    assert len(vorschau) == 36
    assert vorschau[0]["installment_number"] == 1
    assert vorschau[-1]["installment_number"] == 36


async def test_vertrag_kuendigen_beendet_die_serie(auth_client: AsyncClient, seeded: dict) -> None:
    posten = await anlegen(
        auth_client,
        seeded,
        title="Handyvertrag",
        rrule="FREQ=MONTHLY;BYMONTHDAY=1",
        dtstart="2026-03-01",
        contract_start="2026-03-01",
        contract_min_term_months=24,
        contract_notice_period_days=90,
        contract_auto_renew_months=12,
    )

    assert posten["contract_term"]["term_end"] == "2028-02-29"
    assert posten["contract_term"]["notice_deadline"] == "2027-12-01"
    assert posten["contract_term"]["renews_on"] == "2028-03-01"

    gekuendigt = (await auth_client.post(f"/api/recurrences/{posten['id']}/cancel")).json()
    assert gekuendigt["contract_cancelled_at"] == "2028-02-29"
    assert gekuendigt["contract_term"]["is_cancelled"] is True

    vorschau = (
        await auth_client.get(
            f"/api/recurrences/{posten['id']}/preview",
            params={"from": "2026-01-01", "to": "2030-12-31"},
        )
    ).json()
    assert vorschau[-1]["nominal_date"] == "2028-02-01"


async def test_ruecklage_wird_ausgewiesen(auth_client: AsyncClient, seeded: dict) -> None:
    posten = await anlegen(
        auth_client,
        seeded,
        title="Kfz-Versicherung",
        amount="612.00",
        rrule="FREQ=YEARLY;BYMONTH=1;BYMONTHDAY=15",
        dtstart="2026-01-15",
        reserve_enabled=True,
    )

    assert posten["monthly_reserve"] == "51.00"
    assert posten["annual_burden"] == "612.00"