"""The library rules of the web (docs/library.md, 53-library.js): filters, folders, search,
sort, the Weiterlesen card."""
from types import SimpleNamespace

import pytest

from diora_tui import library as lib
from diora_tui.library import Row

NOW = 1_760_000_000_000
DAY = 86_400_000


def row(title, **kw):
    return Row(key=kw.pop("key", title), title=title, **kw)


@pytest.fixture
def rows():
    return [
        row("Das Kapital 2", author="Marx", folders=["Philosophie", "Politik"], pages=900, uploaded_at="2026-01-02", read_at=NOW - 2 * DAY, fraction=0.3),
        row("Das Kapital 10", author="Marx", folders=["Politik"], pages=300, uploaded_at="2026-03-01"),
        row("Ödipus", author="Sophokles", folders=[], pages=0, uploaded_at="2026-02-01", is_read=True, read_at=NOW - 9 * DAY, fraction=1.0),
        row("Zauberberg", author="", folders=["Roman"], pages=700, uploaded_at="2026-04-01", read_at=NOW - 60_000, fraction=0.5),
        row("Jacobin 24", folders=["Zeitschriften"], pages=80, uploaded_at="2026-05-01"),
        row("Heft", folders=[], magazine=True, uploaded_at="2026-05-02"),
    ]


def titles(rs):
    return [r.title for r in rs]


def test_sections_split_books_from_magazines(rows):
    assert titles(lib.section(rows, True)) == ["Jacobin 24", "Heft"]
    assert "Jacobin 24" not in titles(lib.section(rows, False))
    assert lib.is_magazine(row("x", folders=["Magazine"])) and not lib.is_magazine(row("x", folders=["Zeitschriften"], magazine=False))


def test_status_counts_and_filters(rows):
    books = lib.section(rows, False)
    assert lib.status_counts(books) == {"all": 4, "started": 2, "unread": 1, "read": 1}
    assert titles(lib.shown(books, status="started", sort="title")) == ["Das Kapital 2", "Zauberberg"]
    assert titles(lib.shown(books, status="unread")) == ["Das Kapital 10"]
    assert titles(lib.shown(books, status="read")) == ["Ödipus"]


def test_folders_filter_and_order(rows):
    books = lib.section(rows, False)
    assert titles(lib.shown(books, folder="Politik", sort="title")) == ["Das Kapital 2", "Das Kapital 10"]
    assert titles(lib.shown(books, folder="")) == ["Ödipus"]  # without a folder
    # the user's order first, the rest by name
    assert lib.folder_list(books, ["Roman", "Politik"]) == [("Roman", 1), ("Politik", 2), ("Philosophie", 1)]
    assert lib.folder_list(books, None) == [("Philosophie", 1), ("Politik", 2), ("Roman", 1)]


def test_search_ignores_case_and_accents_and_reads_author(rows):
    assert titles(lib.shown(rows, q="odipus")) == ["Ödipus"]
    assert titles(lib.shown(rows, q="MARX", sort="title")) == ["Das Kapital 2", "Das Kapital 10"]
    assert titles(lib.shown(rows, q="sophokles ödipus")) == []  # one run of text, as the web matches


def test_sorts(rows):
    books = lib.section(rows, False)
    assert titles(lib.shown(books, sort="recent")) == ["Zauberberg", "Das Kapital 2", "Ödipus", "Das Kapital 10"]
    assert titles(lib.shown(books, sort="title")) == ["Das Kapital 2", "Das Kapital 10", "Ödipus", "Zauberberg"]  # numbers by value
    assert titles(lib.shown(books, sort="author")) == ["Das Kapital 2", "Das Kapital 10", "Ödipus", "Zauberberg"]  # no author last
    assert titles(lib.shown(books, sort="added")) == ["Zauberberg", "Das Kapital 10", "Ödipus", "Das Kapital 2"]
    assert titles(lib.shown(books, sort="short")) == ["Das Kapital 10", "Zauberberg", "Das Kapital 2", "Ödipus"]  # unknown length last
    assert titles(lib.shown(books, sort="long")) == ["Das Kapital 2", "Zauberberg", "Das Kapital 10", "Ödipus"]


def test_continue_card_takes_the_last_read_unfinished_book(rows):
    going, recent = lib.continue_rows(lib.section(rows, False))
    assert going.title == "Zauberberg"
    assert titles(recent) == ["Das Kapital 2", "Ödipus"]  # the others read lately, finished ones too
    only_done = [r for r in rows if r.is_read]
    assert lib.continue_rows(only_done) == (None, [])
    assert lib.continue_rows([row("neu")]) == (None, [])


def test_continue_card_looks_only_at_the_seven_read_last():
    many = [row(f"b{i}", read_at=NOW - i * 1000, is_read=(i < 7)) for i in range(10)]
    assert lib.continue_rows(many) == (None, [])  # the 7 read last are all finished: no card


def test_length_of_a_book():
    assert lib.pages_of_chars(0) == 0
    assert lib.pages_of_chars(10) == 1
    assert lib.pages_of_chars(1800 * 3 + 900) == 4  # rounds half up like Math.round
    assert lib.pages_of_chars(1800 * 3 + 899) == 3


@pytest.mark.parametrize("ms,expected", [
    (NOW - 30_000, "gerade eben"),
    (NOW - 5 * 60_000, "vor 5 Minuten"),
    (NOW - DAY * 3 - 3_600_000, "vor 3 Tagen"),
])
def test_ago(ms, expected):
    assert lib.ago(ms, NOW) == expected


def test_percent():
    assert lib.percent(row("a", fraction=0.425)) == 43
    assert lib.percent(row("a", is_read=True)) == 100


def test_build_rows_joins_files_and_server_books(tmp_path):
    f = tmp_path / "0001 - Eins.epub"
    f.write_bytes(b"")
    local = tmp_path / "lokal.epub"
    local.write_bytes(b"")
    remote = {"s1": {"server_id": 1, "title": "Eins", "author": "A", "is_read": False, "uploaded_at": "x", "folders": ["F"], "pages": 0},
              "s2": {"server_id": 2, "title": "Zwei", "is_read": True, "pages": 50}}
    states = {"s1": SimpleNamespace(read_at=5, fraction=0.25, device="Handy")}
    key_of = lambda p: "s1" if p.name.startswith("0001") else "hash"  # noqa: E731
    rs = {r.key: r for r in lib.build_rows([f, local], remote, states, {"s1": 12}, key_of)}
    assert set(rs) == {"s1", "s2", "hash"}
    assert (rs["s1"].title, rs["s1"].path, rs["s1"].folders, rs["s1"].fraction, rs["s1"].pages) == ("Eins", f, ["F"], 0.25, 12)
    assert rs["s2"].path is None and rs["s2"].is_read and rs["s2"].pages == 50
    assert rs["hash"].title == "lokal" and rs["hash"].server_id is None