from __future__ import annotations

import hashlib
import hmac

from app.wa import (
    Deduper,
    cards_to_text,
    parse_incoming,
    session_id_for,
    to_whatsapp_text,
    verify_signature,
)


def _sig(secret: str, body: bytes) -> str:
    return "sha256=" + hmac.new(secret.encode(), body, hashlib.sha256).hexdigest()


def test_verify_signature_roundtrip():
    body = b'{"hola": 1}'
    assert verify_signature("s3cret", body, _sig("s3cret", body)) is True
    assert verify_signature("s3cret", body, _sig("wrong", body)) is False
    assert verify_signature("s3cret", body, None) is False
    assert verify_signature("s3cret", body, "md5=abc") is False


def test_to_whatsapp_text_converts_markdown():
    md = "**Manguera plana** de PVC\n\n- [Ver carrito](https://x.com/cart/1:1)\n## Detalles"
    out = to_whatsapp_text(md)
    assert "*Manguera plana*" in out
    assert "**" not in out
    assert "Ver carrito: https://x.com/cart/1:1" in out
    assert "##" not in out


def test_cards_to_text_caps_and_links():
    cards = [
        {"title": f"Prod {i}", "price": "9,99 €", "add_url": f"https://s/cart/{i}:1"}
        for i in range(5)
    ]
    out = cards_to_text(cards)
    assert out.count("•") == 3  # capped
    assert "*Prod 0*" in out and "https://s/cart/0:1" in out


def test_session_id_deterministic_and_fits_column():
    a = session_id_for(1, "34600111222")
    assert a == session_id_for(1, "34600111222")  # stable per phone
    assert a != session_id_for(2, "34600111222")  # tenant-scoped
    assert a != session_id_for(1, "34600999888")  # phone-scoped
    assert len(a) <= 40 and a.startswith("wa")


def test_deduper_remembers_and_evicts():
    d = Deduper(maxlen=2)
    assert d.seen("a") is False
    assert d.seen("a") is True
    d.seen("b"), d.seen("c")  # evicts "a"
    assert d.seen("a") is False


def test_parse_incoming_extracts_text_and_skips_statuses():
    payload = {
        "entry": [
            {
                "changes": [
                    {
                        "value": {
                            "metadata": {"phone_number_id": "111"},
                            "messages": [
                                {"id": "wamid.1", "from": "34600111222", "type": "text",
                                 "text": {"body": "hola"}},
                                {"id": "wamid.2", "from": "34600111222", "type": "image"},
                            ],
                        }
                    },
                    {"value": {"metadata": {"phone_number_id": "111"},
                               "statuses": [{"id": "wamid.1", "status": "delivered"}]}},
                ]
            }
        ]
    }
    msgs = parse_incoming(payload)
    assert len(msgs) == 1
    assert msgs[0].wamid == "wamid.1"
    assert msgs[0].phone_number_id == "111"
    assert msgs[0].from_phone == "34600111222"
    assert msgs[0].text == "hola"