FabledCurator/tests/test_patreon_client.py

"""PatreonClient tests — parsing only, no network.

The fixture is loaded from disk and fed directly to the pure parsing methods
(_transform / extract_media / _validate_response / parse_cursor_from_url); no
live requests call is exercised here.
"""

import json
from pathlib import Path

import pytest

from backend.app.services.patreon_client import (
    MediaItem,
    PatreonClient,
    PatreonDriftError,
    parse_cursor_from_url,
)

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


@pytest.fixture
def response():
    return json.loads(_FIXTURE.read_text())


@pytest.fixture
def client():
    # No cookies file → empty session, but we never make a request in tests.
    return PatreonClient(cookies_path=None)


def _post_by_id(response, post_id):
    for post in response["data"]:
        if post["id"] == post_id:
            return post
    raise AssertionError(f"no post {post_id} in fixture")


def test_transform_indexes_included(client, response):
    index = client._transform(response)
    assert index[("media", "9001")]["file_name"] == "gallery-one.jpg"
    assert index[("media", "9003")]["file_name"] == "bonus-pack.zip"
    assert index[("campaign", "5555")]["name"] == "Example Creator"
    # Unknown keys are absent, not errors.
    assert ("media", "0000") not in index


def test_extract_gallery_dedups_image_large(client, response):
    index = client._transform(response)
    post = _post_by_id(response, "1001")
    items = client.extract_media(post, index)

    # Two gallery images; the image_large cover shares filehash aaaa... with
    # gallery image 9001 → collapses to one, leaving exactly 2 items.
    assert len(items) == 2
    assert all(isinstance(m, MediaItem) for m in items)

    kinds = [m.kind for m in items]
    assert kinds == ["images", "images"]  # image_large deduped away

    filenames = {m.filename for m in items}
    assert filenames == {"gallery-one.jpg", "gallery-two.jpg"}

    hashes = {m.filehash for m in items}
    assert hashes == {"a" * 32, "b" * 32}
    assert all(m.post_id == "1001" for m in items)


def test_extract_attachment_and_postfile(client, response):
    index = client._transform(response)
    post = _post_by_id(response, "1002")
    items = client.extract_media(post, index)

    by_kind = {m.kind: m for m in items}
    # attachments_media → "attachments", plus the post_file → "postfile".
    assert set(by_kind) == {"attachments", "postfile"}
    assert by_kind["attachments"].filename == "bonus-pack.zip"
    assert by_kind["attachments"].filehash == "c" * 32
    assert by_kind["postfile"].filename == "bonus-pack.zip"
    # postfile URL also carries the same hash, but they're different kinds in
    # different relationships; both are kept because dedup is by filehash and
    # the attachment is encountered first... assert the post_file collapsed.
    # (attachments resolved before postfile, same hash → postfile dropped.)
    # So only ONE survives with that hash:
    surviving_c = [m for m in items if m.filehash == "c" * 32]
    assert len(surviving_c) == 1


def test_extract_inline_content_img(client, response):
    index = client._transform(response)
    post = _post_by_id(response, "1003")
    items = client.extract_media(post, index)

    assert len(items) == 1
    item = items[0]
    assert item.kind == "content"
    assert item.filehash == "d" * 32
    # & in the src must be unescaped to & .
    assert "&" not in item.url
    assert "token=x&v=2" in item.url


def test_extract_video_postfile(client, response):
    index = client._transform(response)
    post = _post_by_id(response, "1004")
    items = client.extract_media(post, index)

    assert len(items) == 1
    item = items[0]
    assert item.kind == "postfile"
    assert item.url.startswith("https://stream.mux.com/")
    assert item.filehash == "e" * 32


def test_parse_cursor_from_url_extracts_cursor(response):
    next_url = response["links"]["next"]
    assert parse_cursor_from_url(next_url) == "NEXTCURSOR123"


def test_parse_cursor_from_url_none_when_absent():
    assert parse_cursor_from_url("https://www.patreon.com/api/posts?sort=-x") is None
    assert parse_cursor_from_url(None) is None


def test_iter_posts_yields_triples_and_paginates(client, response, monkeypatch):
    # Page 1 = the fixture (4 posts, links.next → NEXTCURSOR123); page 2 = one
    # post, no links.next → stop. Monkeypatch _fetch so no network is touched.
    page2 = {
        "data": [{"id": "1005", "type": "post", "attributes": {"title": "older"}}],
        "included": [],
        "links": {},
    }

    def fake_fetch(campaign_id, cursor):
        return page2 if cursor == "NEXTCURSOR123" else response

    monkeypatch.setattr(client, "_fetch", fake_fetch)

    seen = list(client.iter_posts("5555"))
    # 4 posts on page 1 + 1 on page 2.
    assert [p["id"] for p, _idx, _cur in seen] == ["1001", "1002", "1003", "1004", "1005"]
    # page_cursor is the cursor that FETCHED the post's page.
    cursors = {p["id"]: cur for p, _idx, cur in seen}
    assert cursors["1001"] is None and cursors["1005"] == "NEXTCURSOR123"
    # included_index is the page's flattened resources, ready for extract_media.
    page1_index = next(idx for p, idx, _cur in seen if p["id"] == "1001")
    assert page1_index[("media", "9001")]["file_name"] == "gallery-one.jpg"


def test_missing_data_raises_drift(client):
    with pytest.raises(PatreonDriftError):
        client._validate_response({"included": []})


def test_non_list_data_raises_drift(client):
    with pytest.raises(PatreonDriftError):
        client._validate_response({"data": {"id": "1"}})


def test_media_missing_file_name_raises_drift(client):
    # A media resource referenced by a gallery relationship but lacking
    # file_name is drift from the contract.
    post = {
        "id": "2000",
        "type": "post",
        "attributes": {"title": "broken"},
        "relationships": {"images": {"data": [{"id": "7777", "type": "media"}]}},
    }
    index = {
        ("media", "7777"): {
            "download_url": "https://c10.patreonusercontent.com/4/orig/"
            + "f" * 32
            + "/x.jpg"
        }
    }
    with pytest.raises(PatreonDriftError):
        client.extract_media(post, index)


def test_media_referenced_but_absent_raises_drift(client):
    post = {
        "id": "2001",
        "type": "post",
        "attributes": {"title": "dangling"},
        "relationships": {"images": {"data": [{"id": "8888", "type": "media"}]}},
    }
    with pytest.raises(PatreonDriftError):
        client.extract_media(post, {})