import pytest

from app.models import Book, Status


def seed(client, *books):  # books: (title, author, status) tuples
    store = client.app.state.store
    for title, author, status in books:
        book = Book(id=store._next_id, title=title, author=author, status=status)
        store._books[book.id] = book
        store._next_id += 1


def test_list_empty_returns_empty_array(client):
    r = client.get("/api/books")
    assert r.status_code == 200
    assert r.json() == []


def test_list_all_in_id_order(client):
    seed(
        client,
        ("Dune", "Frank Herbert", Status.READING),
        ("Emma", None, Status.TO_READ),
        ("Ulysses", "James Joyce", Status.DONE),
    )
    r = client.get("/api/books")
    assert r.status_code == 200
    assert r.json() == [
        {"id": 1, "title": "Dune", "author": "Frank Herbert", "status": "reading"},
        {"id": 2, "title": "Emma", "author": None, "status": "to-read"},
        {"id": 3, "title": "Ulysses", "author": "James Joyce", "status": "done"},
    ]


@pytest.mark.parametrize(
    ("status", "expected_ids"),
    [("to-read", [2, 4]), ("reading", [1]), ("done", [3])],
)
def test_list_filtered_by_status(client, status, expected_ids):
    seed(
        client,
        ("Dune", "Frank Herbert", Status.READING),
        ("Emma", None, Status.TO_READ),
        ("Ulysses", "James Joyce", Status.DONE),
        ("Beloved", "Toni Morrison", Status.TO_READ),
    )
    r = client.get("/api/books", params={"status": status})
    assert r.status_code == 200
    body = r.json()
    assert [b["id"] for b in body] == expected_ids
    assert all(b["status"] == status for b in body)


def test_list_invalid_status_gives_422(client):
    r = client.get("/api/books", params={"status": "bogus"})
    assert r.status_code == 422
    detail = r.json()["detail"]
    assert isinstance(detail, list)
    assert detail[0]["loc"] == ["query", "status"]


def test_patch_updates_status_and_persists(client):
    seed(
        client,
        ("Dune", "Frank Herbert", Status.READING),
        ("Emma", None, Status.TO_READ),
    )
    r = client.patch("/api/books/1", json={"status": "done"})
    assert r.status_code == 200
    assert r.json() == {
        "id": 1,
        "title": "Dune",
        "author": "Frank Herbert",
        "status": "done",
    }
    listed = client.get("/api/books").json()
    assert [b["status"] for b in listed] == ["done", "to-read"]


def test_patch_missing_id_gives_404(client):
    seed(client, ("Dune", "Frank Herbert", Status.READING))
    r = client.patch("/api/books/99", json={"status": "done"})
    assert r.status_code == 404
    assert r.json() == {"detail": "Book not found"}


@pytest.mark.parametrize(
    "kwargs",
    [
        {"json": {"status": "bogus"}},
        {"json": {}},
        {},
    ],
    ids=["bad-status", "missing-status", "missing-body"],
)
def test_patch_invalid_body_gives_422(client, kwargs):
    seed(client, ("Dune", "Frank Herbert", Status.READING))
    r = client.patch("/api/books/1", **kwargs)
    assert r.status_code == 422
    assert isinstance(r.json()["detail"], list)
    assert client.get("/api/books").json()[0]["status"] == "reading"


def test_patch_non_integer_id_gives_422(client):
    r = client.patch("/api/books/abc", json={"status": "done"})
    assert r.status_code == 422
    assert r.json()["detail"][0]["loc"] == ["path", "book_id"]


def test_stats_empty_store_all_zero(client):
    r = client.get("/api/stats")
    assert r.status_code == 200
    assert r.json() == {
        "total": 0,
        "by_status": {"to-read": 0, "reading": 0, "done": 0},
    }


def test_stats_counts_seeded_books_and_tracks_patch(client):
    seed(
        client,
        ("Dune", "Frank Herbert", Status.READING),
        ("Emma", None, Status.TO_READ),
        ("Ulysses", "James Joyce", Status.DONE),
        ("Beloved", "Toni Morrison", Status.DONE),
    )
    assert client.get("/api/stats").json() == {
        "total": 4,
        "by_status": {"to-read": 1, "reading": 1, "done": 2},
    }
    client.patch("/api/books/1", json={"status": "done"})
    assert client.get("/api/stats").json() == {
        "total": 4,
        "by_status": {"to-read": 1, "reading": 0, "done": 3},
    }