from __future__ import annotations


def test_health(client):
    response = client.get("/health")
    assert response.status_code == 200
    assert response.json()["status"] == "ok"


def test_analyze_study_request_endpoint(client):
    response = client.post(
        "/study/analyze-request",
        json={"raw_text": "Kerala +2 Physics electromagnetic induction exam tomorrow, I need A+"},
    )
    assert response.status_code == 200
    body = response.json()
    assert body["subject"] == "Physics"
    assert body["exam"] == "Kerala +2"


def test_study_profile_round_trip(client):
    payload = {
        "exam": "Kerala +2",
        "subject": "Physics",
        "topic": "Electromagnetic Induction",
        "goal": "A+",
        "time_left": "tomorrow",
    }
    create = client.post("/study-profile", json=payload)
    assert create.status_code == 201, create.text
    assert create.json()["subject"] == "Physics"

    me = client.get("/study-profile/me")
    assert me.status_code == 200
    assert me.json()["topic"] == "Electromagnetic Induction"

    patch = client.patch("/study-profile/me", json={"level": "intermediate"})
    assert patch.status_code == 200
    assert patch.json()["level"] == "intermediate"


def test_text_source_create_and_retrieve(client):
    payload = {
        "title": "EMI syllabus",
        "text": (
            "Electromagnetic induction is the process by which a changing magnetic "
            "field induces an EMF in a conductor. Faraday's law and Lenz's law are core."
        ),
        "source_type": "syllabus_text",
        "subject": "Physics",
        "chapter": "Electromagnetic Induction",
    }
    create = client.post("/sources/text", json=payload)
    assert create.status_code == 201, create.text
    source = create.json()
    assert source["status"] == "ready"
    assert source["chunk_count"] >= 1
    source_id = source["id"]

    listing = client.get("/sources")
    assert listing.status_code == 200
    assert any(item["id"] == source_id for item in listing.json()["sources"])

    retrieve = client.post(
        f"/sources/{source_id}/retrieve",
        json={"query": "Faraday's law", "limit": 3},
    )
    assert retrieve.status_code == 200
    chunks = retrieve.json()["chunks"]
    assert chunks  # at least one chunk
    assert "Faraday" in chunks[0]["chunk_text"] or "induction" in chunks[0]["chunk_text"].lower()


def test_study_path_generate_without_pyq(client):
    response = client.post(
        "/study-path/generate",
        json={
            "raw_text": "Kerala +2 Physics electromagnetic induction exam tomorrow, I need A+",
        },
    )
    assert response.status_code == 200
    data = response.json()
    assert data["topic"]
    assert data["study_timeline"]
    assert any("PYQ data is not available yet" in note for note in data["trust_notes"])


def test_pyq_analyze_unavailable(client):
    response = client.post("/pyq/analyze", json={"subject": "Physics"})
    assert response.status_code == 200
    body = response.json()
    assert body["available"] is False
    assert "PYQ data is not available yet" in body["trust_note"]


def test_ask_without_source(client):
    response = client.post(
        "/ask",
        json={"question": "Define electromagnetic induction.", "mode": "explain_simple"},
    )
    assert response.status_code == 200
    body = response.json()
    assert "answer" in body
    assert body["citations"] == []
    assert body["trust_note"]


def test_generate_notes_endpoint(client):
    response = client.post(
        "/generate/notes",
        json={
            "topic": "Electromagnetic Induction",
            "subject": "Physics",
            "level": "intermediate",
            "language_preference": "English",
        },
    )
    assert response.status_code == 200
    body = response.json()
    assert body["type"] == "notes"
    assert body["output"]["key_points"]


def test_billing_flow(client):
    me = client.get("/billing/me")
    assert me.status_code == 200
    assert me.json()["selected_plan"] == "free_trial"
    assert me.json()["coming_soon"] is False

    select = client.post("/billing/select-plan", json={"plan": "popular_299"})
    assert select.status_code == 200
    assert select.json()["selected_plan"] == "popular_299"
    assert select.json()["monthly_video_limit"] == 20

    trial = client.post("/billing/start-trial")
    assert trial.status_code == 200
    assert trial.json()["status"] == "trialing"


def test_billing_all_plan_ids(client):
    for plan_id in ("free_trial", "starter_199", "popular_299", "premium_599", "advanced_1299"):
        r = client.post("/billing/select-plan", json={"plan": plan_id})
        assert r.status_code == 200, f"plan {plan_id} rejected: {r.text}"
        assert r.json()["selected_plan"] == plan_id


def test_billing_invalid_plan_rejected(client):
    r = client.post("/billing/select-plan", json={"plan": "free"})
    assert r.status_code == 400
    r2 = client.post("/billing/select-plan", json={"plan": "pro"})
    assert r2.status_code == 400
    r3 = client.post("/billing/select-plan", json={"plan": "exam_war"})
    assert r3.status_code == 400


def test_billing_advanced_plan_coming_soon(client):
    r = client.post("/billing/select-plan", json={"plan": "advanced_1299"})
    assert r.status_code == 200
    assert r.json()["coming_soon"] is True


def test_billing_checkout_only_active_299_and_599_plans(client):
    stale = client.post("/billing/create-checkout-session", json={"plan": "starter_199"})
    assert stale.status_code == 402
    assert "299 or 599" in stale.json()["detail"]

    advanced = client.post("/billing/create-checkout-session", json={"plan": "advanced_1299"})
    assert advanced.status_code == 402
    assert "299 or 599" in advanced.json()["detail"]

    for plan_id in ("popular_299", "premium_599"):
        checkout = client.post("/billing/create-checkout-session", json={"plan": plan_id})
        assert checkout.status_code == 503, checkout.text
        assert "No payment was started" in checkout.json()["detail"]


def test_video_plan_quick_concept(client):
    response = client.post(
        "/video-generator/plan",
        json={"topic": "Photosynthesis", "video_mode": "quick_concept"},
    )
    assert response.status_code == 200
    body = response.json()
    assert body["scenes"]
    assert body["target_duration_range"] == "5 minutes"
    assert body["estimated_duration_minutes"] == 5
    assert body["render_supported"] is True
    assert body["planning_only"] is False


def test_video_plan_exam_focus(client):
    response = client.post(
        "/video-generator/plan",
        json={"topic": "Electromagnetic Induction", "video_mode": "exam_focus"},
    )
    assert response.status_code == 200
    body = response.json()
    assert body["target_duration_range"] == "10 minutes"
    assert body["estimated_duration_minutes"] == 10
    assert body["render_supported"] is True
    assert body["planning_only"] is False


def test_flashcards_due_endpoint(client):
    r = client.get("/flashcards/due")
    assert r.status_code == 200
    body = r.json()
    assert "due_count" in body
    assert "cards" in body
    assert "also_from_notes" in body

def test_flashcards_review_smoke(client):
    # Smoke: due then review first if any; expect 200 or graceful 4xx if no cards in test db
    r = client.get("/flashcards/due")
    assert r.status_code == 200
    cards = r.json().get("cards", [])
    if cards:
        c = cards[0]
        r2 = client.post(
            "/flashcards/review",
            json={"set_id": c["set_id"], "card_index": c["card_index"], "quality": 3},
        )
        assert r2.status_code in (200, 422, 404)

def test_ai_provider_has_streaming(client):
    # Presence check for new streaming StudyCast/Ask support
    from app.services.ai_provider import get_ai_provider
    p = get_ai_provider()
    assert hasattr(p, "generate_streaming")
    assert callable(getattr(p, "generate_streaming"))

def test_video_plan_deep_masterclass_30_minutes(client):
    response = client.post(
        "/video-generator/plan",
        json={"topic": "Photosynthesis", "video_mode": "deep_masterclass"},
    )
    assert response.status_code == 200
    body = response.json()
    assert body["target_duration_range"] == "30 minutes"
    assert body["estimated_duration_minutes"] == 30
    assert body["render_supported"] is True
    assert body["planning_only"] is False


def test_video_plan_war_mode_maps_to_30_minutes(client):
    response = client.post(
        "/video-generator/plan",
        json={"topic": "Full Chapter Biology", "video_mode": "full_chapter_war_mode"},
    )
    assert response.status_code == 200
    body = response.json()
    assert body["target_duration_range"] == "30 minutes"
    assert body["estimated_duration_minutes"] == 30
    assert body["render_supported"] is True
    assert body["planning_only"] is False


# ── Phase 7: multi-source study path ─────────────────────────────────────────

def test_study_path_single_source_works(client):
    """A study path with a single source_id returns a valid plan."""
    create = client.post(
        "/sources/text",
        json={
            "title": "EMI notes",
            "text": "Electromagnetic induction: Faraday's law says EMF = -dΦ/dt.",
            "source_type": "notes",
            "subject": "Physics",
        },
    )
    assert create.status_code == 201
    source_id = create.json()["id"]

    response = client.post(
        "/study-path/generate",
        json={
            "raw_text": "Kerala +2 Physics electromagnetic induction exam tomorrow",
            "source_id": source_id,
        },
    )
    assert response.status_code == 200
    data = response.json()
    assert data["study_timeline"]
    assert data["source_basis"] == "user_sources"


def test_study_path_multi_source_returns_valid_plan(client):
    """A study path with source_ids list returns a merged plan."""
    src1 = client.post(
        "/sources/text",
        json={"title": "EMI src1", "text": "Faraday's law of electromagnetic induction.", "source_type": "notes"},
    )
    src2 = client.post(
        "/sources/text",
        json={"title": "EMI src2", "text": "Lenz's law explains direction of induced current.", "source_type": "notes"},
    )
    assert src1.status_code == 201
    assert src2.status_code == 201

    response = client.post(
        "/study-path/generate",
        json={
            "raw_text": "Physics electromagnetic induction exam tomorrow",
            "source_ids": [src1.json()["id"], src2.json()["id"]],
        },
    )
    assert response.status_code == 200
    data = response.json()
    assert data["study_timeline"]
    assert data["source_basis"] == "user_sources"


def test_study_path_without_source_uses_generic_template(client):
    response = client.post(
        "/study-path/generate",
        json={"raw_text": "Kerala +2 Physics electromagnetic induction exam tomorrow"},
    )
    assert response.status_code == 200
    data = response.json()
    assert data["source_basis"] == "generic_topic_template"
    # Trust note should mention no source
    assert any("No source uploaded" in n for n in data["trust_notes"])


# ── Phase 8: multi-source Ask DocDoe ─────────────────────────────────────────

def test_studio_notes_with_source_ids_returns_answer(client):
    """Studio generation accepts source_ids list and returns structured output."""
    src1 = client.post(
        "/sources/text",
        json={"title": "Notes src1", "text": "Faraday's law of electromagnetic induction.", "source_type": "notes"},
    )
    src2 = client.post(
        "/sources/text",
        json={"title": "Notes src2", "text": "Lenz's law gives the direction of induced EMF.", "source_type": "notes"},
    )
    assert src1.status_code == 201
    assert src2.status_code == 201

    response = client.post(
        "/generate/notes",
        json={
            "topic": "Electromagnetic induction",
            "source_ids": [src1.json()["id"], src2.json()["id"]],
            "language_preference": "English",
        },
    )
    assert response.status_code == 200
    body = response.json()
    assert body["type"] == "notes"
    assert body["output"]
    assert "evidence_label" in body


def test_ask_with_source_ids_returns_answer(client):
    """Ask endpoint accepts source_ids list and returns an answer."""
    src = client.post(
        "/sources/text",
        json={
            "title": "EMI ask test",
            "text": "Faraday's law: EMF = -dΦ/dt. Lenz's law gives direction.",
            "source_type": "notes",
        },
    )
    assert src.status_code == 201
    source_id = src.json()["id"]

    response = client.post(
        "/ask",
        json={
            "question": "State Faraday's law.",
            "mode": "explain_simple",
            "source_ids": [source_id],
        },
    )
    assert response.status_code == 200
    body = response.json()
    assert body["answer"]
    assert body["model_used"]


def test_ask_citation_shape(client):
    """Citations returned by Ask should have the expected fields."""
    src = client.post(
        "/sources/text",
        json={
            "title": "Citation test",
            "text": "Electromagnetic induction produces an EMF when flux changes.",
            "source_type": "notes",
        },
    )
    assert src.status_code == 201
    source_id = src.json()["id"]

    response = client.post(
        "/ask",
        json={
            "question": "What is electromagnetic induction?",
            "mode": "explain_simple",
            "source_id": source_id,
        },
    )
    assert response.status_code == 200
    body = response.json()
    for citation in body.get("citations", []):
        assert "chunk_id" in citation
        assert "snippet" in citation
        assert len(citation["snippet"]) <= 240


def test_ask_multi_source_trust_note_absent_when_sources_ready(client):
    """When a valid source is given, trust_note should not flag 'no source'."""
    src = client.post(
        "/sources/text",
        json={"title": "Trust test", "text": "Photosynthesis converts CO2 to glucose.", "source_type": "notes"},
    )
    source_id = src.json()["id"]

    response = client.post(
        "/ask",
        json={"question": "What is photosynthesis?", "mode": "explain_simple", "source_id": source_id},
    )
    body = response.json()
    # trust_note should either be None or not say "No source attached"
    trust = body.get("trust_note") or ""
    assert "No source attached" not in trust


# ── Phase 9: usage accounting ─────────────────────────────────────────────────

def test_generation_usage_increments_after_notes(client):
    """Calling /generate/notes should increment monthly_generation_used."""
    before = client.get("/billing/me").json()["monthly_generation_used"]

    client.post(
        "/generate/notes",
        json={"topic": "Photosynthesis", "subject": "Biology", "language_preference": "English"},
    )

    after = client.get("/billing/me").json()["monthly_generation_used"]
    assert after == before + 1


def test_generation_usage_increments_after_quiz(client):
    before = client.get("/billing/me").json()["monthly_generation_used"]

    client.post(
        "/generate/quiz",
        json={"topic": "Trigonometry", "subject": "Mathematics", "language_preference": "English"},
    )

    after = client.get("/billing/me").json()["monthly_generation_used"]
    assert after == before + 1


def test_video_plan_usage_increments(client):
    """Calling /video-generator/plan should increment monthly_video_used."""
    before = client.get("/billing/me").json()["monthly_video_used"]

    client.post(
        "/video-generator/plan",
        json={"topic": "Photosynthesis", "video_mode": "quick_concept"},
    )

    after = client.get("/billing/me").json()["monthly_video_used"]
    assert after == before + 1


def test_billing_me_includes_derived_usage_fields(client):
    """Billing /me response should include remaining counts and optional warning."""
    body = client.get("/billing/me").json()
    assert "remaining_generations" in body
    assert "remaining_videos" in body
    # usage_warning is optional (None when under limit)
    assert "usage_warning" in body


def test_billing_stripe_webhook_rejects_when_secret_is_missing(client):
    """Unsigned JSON must never mutate entitlements, including in development."""
    # Simulate a minimal checkout.session.completed event body (Stripe format)
    fake_event = {
        "id": "evt_test_123",
        "type": "checkout.session.completed",
        "data": {
            "object": {
                "client_reference_id": "usr_webhook_test",
                "metadata": {"plan_key": "popular_299", "user_id": "usr_webhook_test"},
            }
        },
    }
    r = client.post(
        "/billing/webhook",
        json=fake_event,
        headers={"stripe-signature": "t=123,v1=fake"},
    )
    assert r.status_code == 503


# ── Phase 11: time-based study path via endpoint ──────────────────────────────

def test_study_path_endpoint_1_hour_plan_has_few_steps(client):
    """1_hour time_left via endpoint should result in a short plan."""
    response = client.post(
        "/study-path/generate",
        json={
            "raw_text": "Physics electromagnetic induction in 1 hour",
        },
    )
    assert response.status_code == 200
    data = response.json()
    # Analyzer should pick up "1_hour" from "in 1 hour"
    if data.get("time_left") == "1_hour":
        assert len(data["study_timeline"]) <= 3


def test_study_path_endpoint_7_days_has_day_blocks(client):
    """7_days plan via endpoint should carry day_block on each step."""
    response = client.post(
        "/study-path/generate",
        json={
            "raw_text": "Physics electromagnetic induction 7 days left",
        },
    )
    assert response.status_code == 200
    data = response.json()
    if data.get("time_left") == "7_days":
        for step in data["study_timeline"]:
            assert "day_block" in step


def test_study_path_endpoint_pyq_trust_note_present(client):
    """PYQ unavailable note must always appear when no PYQ data uploaded."""
    response = client.post(
        "/study-path/generate",
        json={"raw_text": "Kerala +2 Physics electromagnetic induction exam tomorrow, I need A+"},
    )
    assert response.status_code == 200
    data = response.json()
    assert any("PYQ data is not available yet" in note for note in data["trust_notes"])


def test_study_path_plan_type_and_label_present(client):
    """Study path response should include plan_type and plan_label fields."""
    response = client.post(
        "/study-path/generate",
        json={"raw_text": "Kerala +2 Physics electromagnetic induction tonight"},
    )
    assert response.status_code == 200
    data = response.json()
    assert "plan_type" in data
    assert "plan_label" in data