"""
Functional tests — POST /generate/async endpoint
==================================================
Tests for the async (RQ-queue) document generation endpoint.

Key behaviours exercised:
  • Schema validation (422) for missing / bad fields
  • 404 when request_id not in Supabase
  • 503 behaviour when Redis queue is unavailable (if applicable)
  • Response contract when request is queued successfully
  • Same prompt_params validation as /generate/pdf (shared schema)
"""
import copy
import pytest
import requests
from tests.conftest import (
    BASE_URL, TIMEOUT, SEED_IMAGE_URL,
    NONEXISTENT_REQUEST_ID, MINIMAL_GENERATE_PAYLOAD,
)

ENDPOINT = f"{BASE_URL}/generate/async"


def make_payload(**overrides):
    payload = copy.deepcopy(MINIMAL_GENERATE_PAYLOAD)
    payload.update(overrides)
    return payload


def make_prompt_override(**kw):
    pp = copy.deepcopy(MINIMAL_GENERATE_PAYLOAD["prompt_params"])
    pp.update(kw)
    return pp


# ---------------------------------------------------------------------------
# 1. Schema / Input Validation
# ---------------------------------------------------------------------------

class TestGenerateAsyncInputValidation:
    """FastAPI must reject malformed requests before any business logic."""

    def test_missing_request_id_returns_422(self, http):
        payload = {
            "seed_images": [SEED_IMAGE_URL],
            "prompt_params": MINIMAL_GENERATE_PAYLOAD["prompt_params"],
        }
        r = http.post(ENDPOINT, json=payload, timeout=TIMEOUT)
        assert r.status_code == 422

    def test_empty_seed_images_returns_422(self, http):
        r = http.post(ENDPOINT, json=make_payload(seed_images=[]), timeout=TIMEOUT)
        assert r.status_code == 422

    def test_too_many_seed_images_returns_422(self, http):
        r = http.post(ENDPOINT,
                      json=make_payload(seed_images=[SEED_IMAGE_URL] * 11),
                      timeout=TIMEOUT)
        assert r.status_code == 422

    def test_invalid_seed_image_url_returns_422(self, http):
        r = http.post(ENDPOINT,
                      json=make_payload(seed_images=["not-a-url"]),
                      timeout=TIMEOUT)
        assert r.status_code == 422

    def test_num_solutions_below_min_returns_422(self, http):
        pp = make_prompt_override(num_solutions=0)
        r = http.post(ENDPOINT, json=make_payload(prompt_params=pp), timeout=TIMEOUT)
        assert r.status_code == 422

    def test_num_solutions_above_max_returns_422(self, http):
        pp = make_prompt_override(num_solutions=6)
        r = http.post(ENDPOINT, json=make_payload(prompt_params=pp), timeout=TIMEOUT)
        assert r.status_code == 422

    def test_empty_body_returns_422(self, http):
        r = http.post(ENDPOINT, json={}, timeout=TIMEOUT)
        assert r.status_code == 422


# ---------------------------------------------------------------------------
# 2. Business-logic (valid schema, unknown request_id → 404 or 503)
# ---------------------------------------------------------------------------

class TestGenerateAsyncBusinessLogic:
    """
    With a valid schema but nonexistent request_id the API should:
      • Return 404 if Redis is available (request_id lookup fails first), OR
      • Return 503 if Redis is unavailable (queue not initialised)
    Both are acceptable non-422 responses.
    """

    def test_nonexistent_request_id_is_not_422(self, http):
        r = http.post(ENDPOINT, json=MINIMAL_GENERATE_PAYLOAD, timeout=TIMEOUT)
        assert r.status_code != 422, (
            f"Valid schema must not produce 422, got {r.status_code}"
        )

    def test_nonexistent_request_id_returns_404_or_503(self, http):
        r = http.post(ENDPOINT, json=MINIMAL_GENERATE_PAYLOAD, timeout=TIMEOUT)
        assert r.status_code in (404, 503), (
            f"Expected 404 (no request) or 503 (no Redis), got {r.status_code}: {r.text}"
        )

    def test_error_response_is_json(self, http):
        r = http.post(ENDPOINT, json=MINIMAL_GENERATE_PAYLOAD, timeout=TIMEOUT)
        assert "application/json" in r.headers.get("Content-Type", "")

    def test_error_response_has_detail(self, http):
        r = http.post(ENDPOINT, json=MINIMAL_GENERATE_PAYLOAD, timeout=TIMEOUT)
        body = r.json()
        assert "detail" in body, f"Error body must have 'detail'. Got: {body}"

    def test_swagger_string_tokens_not_422(self, http):
        payload = make_payload(
            google_drive_token="string",
            google_drive_refresh_token="string",
        )
        r = http.post(ENDPOINT, json=payload, timeout=TIMEOUT)
        assert r.status_code != 422

    def test_none_google_tokens_accepted(self, http):
        payload = make_payload(google_drive_token=None, google_drive_refresh_token=None)
        r = http.post(ENDPOINT, json=payload, timeout=TIMEOUT)
        assert r.status_code != 422

    def test_num_solutions_boundary_values_schema_valid(self, http):
        for n in [1, 5]:
            pp = make_prompt_override(num_solutions=n)
            r = http.post(ENDPOINT, json=make_payload(prompt_params=pp), timeout=TIMEOUT)
            assert r.status_code != 422, (
                f"num_solutions={n} should be schema-valid"
            )

    def test_missing_prompt_params_uses_defaults(self, http):
        payload = {"request_id": NONEXISTENT_REQUEST_ID}
        r = http.post(ENDPOINT, json=payload, timeout=TIMEOUT)
        assert r.status_code != 422