import pytest

from bindery import orchestrator as backend

SITE = {
    "title": "Site Title",
    "authors": ["Writer"],
    "comments": "<p>New blurb</p>",
    "tags": ["Fantasy", "Completed"],
    "series": "Saga",
    "series_index": 2.0,
    "pubdate": "2020-01-01T00:00:00",
    "languages": "en",
}


def story(**extra):
    base = {"locked_fields": ["title"], "pinned": {}, "site_values": {}}
    base.update(extra)
    return base


def test_first_download_keeps_site_value():
    assert backend._resolve_metadata(story(), SITE, []) == {"title": "Site Title"}


def test_locked_field_keeps_its_value():
    assert backend._resolve_metadata(story(pinned={"title": "Old"}), SITE, []) == {"title": "Old"}


def test_forced_field_takes_site_value_and_stays_locked():
    s = story(pinned={"title": "Old"})
    assert backend._resolve_metadata(s, SITE, ["title"]) == {"title": "Site Title"}


def test_edited_unlocked_field_stays_until_the_site_changes_it():
    s = story(pinned={"title": "Old", "tags": ["mine"]}, site_values=SITE)
    assert backend._resolve_metadata(s, SITE, []) == {"title": "Old", "tags": ["mine"]}
    changed = {**SITE, "tags": ["Fantasy", "Completed", "LitRPG"]}
    assert backend._resolve_metadata(s, changed, []) == {"title": "Old"}
    # A change to another field keeps the edit.
    assert backend._resolve_metadata(s, {**SITE, "comments": "<p>x</p>"}, []) == {"title": "Old", "tags": ["mine"]}


def test_forced_update_replaces_an_edited_unlocked_field():
    s = story(pinned={"tags": ["mine"]}, site_values=SITE)
    assert backend._resolve_metadata(s, SITE, ["tags"]) == {"title": "Site Title"}


def test_edit_before_the_first_site_values_stays():
    s = story(pinned={"tags": ["mine"]})
    assert backend._resolve_metadata(s, SITE, []) == {"title": "Site Title", "tags": ["mine"]}


def test_edited_values_are_checked_and_normalized():
    assert backend._edited_value("authors", "A & B ") == ["A", "B"]
    assert backend._edited_value("tags", "x, y,,") == ["x", "y"]
    assert backend._edited_value("series", "Saga [2]") == ["Saga", 2.0]
    assert backend._edited_value("series", ["Saga", "3"]) == ["Saga", 3.0]
    assert backend._edited_value("series", "") == ["", None]
    assert backend._edited_value("pubdate", "2024-01-31") == "2024-01-31"
    assert backend._edited_value("title", " New ") == "New"
    for field, value in (("title", " "), ("authors", "&"), ("pubdate", "soon")):
        with pytest.raises(ValueError):
            backend._edited_value(field, value)


def test_series_keeps_name_and_index():
    s = story(locked_fields=["series"])
    assert backend._resolve_metadata(s, SITE, []) == {"series": ["Saga", 2.0]}


def test_resolve_without_site_values_does_not_fail():
    assert backend._resolve_metadata(story(pinned={"title": "Old"}), {}, []) == {"title": "Old"}