"""Patreon API contract test (native ingester build step 4).

The drift tripwire the plan calls for: if the field-set we SEND or the parser we
resolve responses against drifts from what real Patreon returns, this build goes
RED — instead of the ingester silently importing nothing in production (the exact
failure mode the native ingester exists to escape).

Two halves:
  - the recorded `/api/posts` fixture must still parse end-to-end (no drift), and
  - the request params must still carry every field the parser depends on (the
    fixture already has the data, so trimming the request would NOT trip the
    parse half — this half guards the request shape directly).

Pure: no network, no DB.
"""

import json
from pathlib import Path

from backend.app.services.patreon_client import MediaItem, PatreonClient

_FIXTURE = Path(__file__).parent / "fixtures" / "patreon_posts_page1.json"

# Pinned media total across the 4 fixture posts: 1001→2 (gallery, image_large
# cover deduped), 1002→1 (attachment+postfile collapse), 1003→1 (inline content
# img), 1004→1 (video postfile). A parser change that drops or doubles media
# trips this.
_EXPECTED_MEDIA_TOTAL = 5
_KNOWN_KINDS = {"images", "image_large", "attachments", "postfile", "content"}


def test_recorded_fixture_parses_end_to_end():
    response = json.loads(_FIXTURE.read_text())
    client = PatreonClient(cookies_path=None)

    client._validate_response(response)  # top-level shape must hold
    index = client._transform(response)

    total = 0
    for post in response["data"]:
        items = client.extract_media(post, index)  # must not raise drift
        for m in items:
            assert isinstance(m, MediaItem)
            assert m.url, f"empty url in post {post['id']}"
            assert m.filename, f"empty filename in post {post['id']}"
            assert m.kind in _KNOWN_KINDS, f"unknown kind {m.kind!r}"
            assert m.post_id == post["id"]
        total += len(items)

    assert total == _EXPECTED_MEDIA_TOTAL


def test_request_field_set_carries_parser_dependencies():
    """The params we SEND must keep requesting the fields the parser resolves
    against. Trimming `fields[media]=file_name`, an `include` relationship, or a
    `fields[post]` key would make real responses parse to nothing — caught here,
    not by the fixture parse above."""
    params = PatreonClient(cookies_path=None)._params("5555", None)

    media_fields = params["fields[media]"]
    assert "file_name" in media_fields
    assert "image_urls" in media_fields or "download_url" in media_fields

    includes = params["include"]
    for rel in ("images", "attachments_media", "media"):
        assert rel in includes, f"missing include relationship {rel}"

    post_fields = params["fields[post]"]
    # content_json_string is the CURRENT body field (Patreon nulled flat `content`,
    # #842); content kept for legacy posts. Both must stay requested.
    for field in ("content", "content_json_string", "post_file", "image"):
        assert field in post_fields, f"missing post field {field}"

    assert params["filter[campaign_id]"] == "5555"