"""Einzelstücke: Kaufpreis und Belege (Metadaten in der Ausgabe, Dateinamen-Härtung)."""

import pytest

from app.models import (
    Category,
    CategoryTracking,
    Item,
    ItemDocument,
    Location,
    Movement,
    MovementType,
    Product,
    Role,
    User,
)
from app.routers.items import _safe_filename, create_items, get_item, list_all_items
from app.schemas import ItemCreate
from app.services.stock import current_stock


@pytest.fixture()
def admin(db):
    person = User(username="admin", password_hash="x", role=Role.admin)
    db.add(person)
    db.commit()
    db.refresh(person)
    return person


def _product(db):
    cat = Category(name="Elektronik", tracking=CategoryTracking.object.value)
    db.add(cat)
    db.flush()
    product = Product(name="Kamera", category_id=cat.id, individual=True)
    db.add(product)
    db.commit()
    db.refresh(product)
    return product


def test_item_kaufpreis_round_trip(db, admin):
    product = _product(db)
    out = create_items(
        product.id, ItemCreate(count=1, price_cents=49900, currency="CHF"), db=db, user=admin
    )
    assert out[0].price_cents == 49900
    assert out[0].currency == "CHF"


def test_item_out_listet_belege(db, admin):
    product = _product(db)
    item_id = create_items(product.id, ItemCreate(count=1), db=db, user=admin)[0].id
    db.add(ItemDocument(item_id=item_id, filename="rechnung.pdf",
                        content_type="application/pdf", data=b"%PDF-1.4 x"))
    db.commit()

    fresh = get_item(item_id, db=db, _=admin)
    assert len(fresh.documents) == 1
    assert fresh.documents[0].filename == "rechnung.pdf"
    assert fresh.documents[0].content_type == "application/pdf"


def test_list_all_items_angereichert(db, admin):
    cat = Category(name="Elektronik", tracking=CategoryTracking.object.value)
    db.add(cat)
    db.flush()
    product = Product(name="Kamera", brand="Sony", category_id=cat.id, individual=True)
    db.add(product)
    db.flush()
    ort = Location(name="Keller")
    db.add(ort)
    db.commit()
    create_items(product.id, ItemCreate(count=2, location_id=ort.id), db=db, user=admin)

    alle = list_all_items(db=db, _=admin)
    assert len(alle) == 2
    e = alle[0]
    assert e.product_name == "Kamera"
    assert e.product_brand == "Sony"
    assert e.category_name == "Elektronik"
    assert e.location_id == ort.id
    assert e.location_name == "Keller"


def test_safe_filename_entfernt_header_zeichen():
    assert _safe_filename('a"b\r\nc.pdf') == "abc.pdf"
    assert _safe_filename("   ") == "beleg"
    assert _safe_filename(None) == "beleg"


# --------------------------------------------------------------------------
# Verlauf: Anlegen und Entfernen muessen beide auftauchen
# --------------------------------------------------------------------------
def test_anlegen_schreibt_bewegung_je_stueck(db, admin):
    """Frueher kannte der Verlauf nur das Verschwinden, nie das Entstehen."""
    product = _product(db)
    ort = Location(name="Keller")
    db.add(ort)
    db.commit()

    create_items(product.id, ItemCreate(count=3, location_id=ort.id), db=db, user=admin)

    bewegungen = db.query(Movement).filter(Movement.product_id == product.id).all()
    assert len(bewegungen) == 3
    for b in bewegungen:
        assert b.type == MovementType.in_
        assert b.quantity == 1
        assert b.unit_used == "Stück"
        assert b.location_id == ort.id
        assert b.user_id == admin.id
    # Die UID gehoert in den Eintrag, sonst sagt der Verlauf nicht, welches Stueck.
    uids = {i.uid for i in db.query(Item).filter(Item.product_id == product.id)}
    assert {b.note.removeprefix("Einzelstück ") for b in bewegungen} == uids


def test_anlegen_uebernimmt_die_notiz_als_grund(db, admin):
    """Eine eigene Notiz ist aussagekraeftiger als die UID - sie gewinnt."""
    product = _product(db)
    create_items(product.id, ItemCreate(count=1, note="Geschenk von Oma"), db=db, user=admin)

    bewegung = db.query(Movement).filter(Movement.product_id == product.id).one()
    assert bewegung.note == "Geschenk von Oma"


def test_anlegen_veraendert_den_bestand_nicht_doppelt(db, admin):
    """Der Bestand zaehlt Zeilen in items - die Bewegung darf nichts dazutun."""
    product = _product(db)
    create_items(product.id, ItemCreate(count=2), db=db, user=admin)
    assert current_stock(db, product.id) == 2.0