"""Suite B — Upsell engine link visibility rules (P0)."""

import pytest

from app.services.session_core.context import compute_interest_score
from app.services.session_core.manager import SessionContext
from app.services.upsell_engine import UpsellEngine, response_has_intrigue_hook


@pytest.fixture
def engine():
    return UpsellEngine()


@pytest.mark.p0
def test_purchase_intent_always_shows_link(engine):
    ctx = SessionContext(session_id="s1", author_id="a1", turn_count=0)
    assert engine.should_include_link("purchase_intent", ctx, "DIRECT_CTA") is True


@pytest.mark.p0
def test_complaint_never_shows_link(engine):
    ctx = SessionContext(
        session_id="s1",
        author_id="a1",
        turn_count=5,
        selected_book_id="book-1",
        interest_score=0.9,
    )
    strategy = engine.select_strategy("complaint", ctx)
    assert engine.should_include_link("complaint", ctx, strategy) is False


@pytest.mark.p0
def test_turn_two_with_selected_book_shows_link(engine):
    ctx = SessionContext(
        session_id="s1",
        author_id="a1",
        turn_count=2,
        selected_book_id="book-1",
        interest_score=0.2,
    )
    strategy = engine.select_strategy("question", ctx)
    assert engine.should_include_link("question", ctx, strategy) is True


@pytest.mark.p0
def test_greeting_turn_one_no_link(engine):
    ctx = SessionContext(session_id="s1", author_id="a1", turn_count=0)
    strategy = engine.select_strategy("greeting", ctx)
    assert engine.should_include_link("greeting", ctx, strategy) is False


@pytest.mark.p0
def test_full_story_request_shows_link(engine):
    ctx = SessionContext(session_id="s1", author_id="a1", turn_count=0)
    strategy = engine.select_strategy("full_story_request", ctx)
    assert strategy == "DIRECT_CTA"
    assert engine.should_include_link("full_story_request", ctx, strategy) is True


@pytest.mark.p0
def test_book_comparison_uses_social_proof_at_medium_engagement(engine):
    ctx = SessionContext(
        session_id="s1",
        author_id="a1",
        turn_count=5,
        interest_score=0.5,
    )
    strategy = engine.select_strategy("book_comparison", ctx)
    assert strategy == "SOCIAL_PROOF"


def test_fallback_hook_skipped_when_intrigue_present(engine):
    text = "She carries a secret — want to know what it cost her?"
    assert engine.fallback_hook_if_needed(text, "CURIOSITY_GAP", 0.6) is None


def test_fallback_hook_when_flat_response(engine):
    text = "The protagonist is brave."
    hook = engine.fallback_hook_if_needed(text, "CURIOSITY_GAP", 0.6)
    assert hook is not None
    assert response_has_intrigue_hook(hook) or len(hook) > 10


def test_pricing_intent_boosts_score():
    cold = compute_interest_score(1, [])
    hot = compute_interest_score(1, ["pricing"], current_intent="purchase_intent")
    assert hot > cold
    assert hot >= 0.75