"""CRUD des éléments d'un support de formation (document_engine/elements/)
— sans Flask, directement contre le support.db créé par db.create_support.
Couvre : CRUD complet, rangées (parent_id), réinsertion (move_document_element
vers une nouvelle rangée/position), suppression en cascade d'une rangée avec
enfants.

Chaque élément appartient désormais à une page (voir document_engine/
pages/) — _new_support renvoie (slug, page_id) de la première page créée
par défaut, réutilisée par tous les tests de ce fichier."""

from typing import Any

import db
import document_engine as doc_engine


def _new_support(tmp_support_slug_cleanup: Any, name: str = "Support de test") -> tuple[str, int]:
    slug = db.create_support(name, owner_folder="90")
    tmp_support_slug_cleanup(slug)
    page_id = doc_engine.list_document_pages(slug)[0]["id"]
    return slug, page_id


def test_add_and_get_document_element_uses_default_attributes(tmp_support_slug_cleanup: Any) -> None:
    slug, page_id = _new_support(tmp_support_slug_cleanup)
    element_id = doc_engine.add_document_element(slug, "titre", page_id=page_id)
    element = doc_engine.get_document_element(slug, element_id)
    assert element is not None
    assert element["kind"] == "titre"
    assert element["page_id"] == page_id
    assert element["parent_id"] is None
    assert element["attributes"]["content"] == "Nouveau titre"


def test_get_document_element_returns_none_for_missing_id(tmp_support_slug_cleanup: Any) -> None:
    slug, _page_id = _new_support(tmp_support_slug_cleanup)
    assert doc_engine.get_document_element(slug, 999) is None


def test_list_document_elements_groups_row_children_together(tmp_support_slug_cleanup: Any) -> None:
    slug, page_id = _new_support(tmp_support_slug_cleanup)
    row_id = doc_engine.add_document_element(slug, "row", page_id=page_id)
    top_titre_id = doc_engine.add_document_element(slug, "titre", page_id=page_id)
    child_a_id = doc_engine.add_document_element(slug, "paragraphe", page_id=page_id, parent_id=row_id)
    child_b_id = doc_engine.add_document_element(slug, "image", page_id=page_id, parent_id=row_id)

    elements = doc_engine.list_document_elements(slug, page_id)
    ids_in_order = [el["id"] for el in elements]

    # Les deux top-niveau (row_id, top_titre_id) groupés avant les deux
    # enfants de la rangée (child_a_id, child_b_id) — tri (parent_id, order_index).
    assert ids_in_order.index(row_id) < ids_in_order.index(child_a_id)
    assert ids_in_order.index(top_titre_id) < ids_in_order.index(child_a_id)
    assert ids_in_order.index(child_a_id) < ids_in_order.index(child_b_id)


def test_list_document_elements_only_returns_the_given_page(tmp_support_slug_cleanup: Any) -> None:
    slug, page1_id = _new_support(tmp_support_slug_cleanup)
    page2_id = doc_engine.add_document_page(slug)
    el1_id = doc_engine.add_document_element(slug, "titre", page_id=page1_id)
    el2_id = doc_engine.add_document_element(slug, "titre", page_id=page2_id)

    assert [el["id"] for el in doc_engine.list_document_elements(slug, page1_id)] == [el1_id]
    assert [el["id"] for el in doc_engine.list_document_elements(slug, page2_id)] == [el2_id]


def test_update_document_element_attributes_replaces_whole_json(tmp_support_slug_cleanup: Any) -> None:
    slug, page_id = _new_support(tmp_support_slug_cleanup)
    element_id = doc_engine.add_document_element(slug, "paragraphe", page_id=page_id)
    doc_engine.update_document_element_attributes(slug, element_id, {"content": "Texte modifié", "style": "legende"})
    element = doc_engine.get_document_element(slug, element_id)
    assert element is not None
    assert element["attributes"] == {"content": "Texte modifié", "style": "legende"}


def test_move_document_element_reorders_within_same_parent(tmp_support_slug_cleanup: Any) -> None:
    slug, page_id = _new_support(tmp_support_slug_cleanup)
    first_id = doc_engine.add_document_element(slug, "titre", page_id=page_id)
    second_id = doc_engine.add_document_element(slug, "paragraphe", page_id=page_id)
    third_id = doc_engine.add_document_element(slug, "image", page_id=page_id)

    doc_engine.move_document_element(slug, third_id, None, 0)

    elements = doc_engine.list_document_elements(slug, page_id)
    top_level = [el for el in elements if el["parent_id"] is None]
    ordered_ids = [el["id"] for el in sorted(top_level, key=lambda el: el["order_index"])]
    assert ordered_ids == [third_id, first_id, second_id]


def test_move_document_element_reparents_into_a_row(tmp_support_slug_cleanup: Any) -> None:
    slug, page_id = _new_support(tmp_support_slug_cleanup)
    row_id = doc_engine.add_document_element(slug, "row", page_id=page_id)
    lone_titre_id = doc_engine.add_document_element(slug, "titre", page_id=page_id)

    doc_engine.move_document_element(slug, lone_titre_id, row_id, 0)

    moved = doc_engine.get_document_element(slug, lone_titre_id)
    assert moved is not None
    assert moved["parent_id"] == row_id
    assert moved["order_index"] == 0


def test_delete_document_element_cascades_to_row_children(tmp_support_slug_cleanup: Any) -> None:
    slug, page_id = _new_support(tmp_support_slug_cleanup)
    row_id = doc_engine.add_document_element(slug, "row", page_id=page_id)
    child_id = doc_engine.add_document_element(slug, "titre", page_id=page_id, parent_id=row_id)

    doc_engine.delete_document_element(slug, row_id)

    assert doc_engine.get_document_element(slug, row_id) is None
    assert doc_engine.get_document_element(slug, child_id) is None


def test_delete_document_element_on_missing_id_is_a_noop(tmp_support_slug_cleanup: Any) -> None:
    slug, _page_id = _new_support(tmp_support_slug_cleanup)
    doc_engine.delete_document_element(slug, 999)


def test_render_document_includes_row_children(tmp_support_slug_cleanup: Any) -> None:
    slug, page_id = _new_support(tmp_support_slug_cleanup)
    row_id = doc_engine.add_document_element(slug, "row", page_id=page_id)
    titre_id = doc_engine.add_document_element(slug, "titre", page_id=page_id, parent_id=row_id)

    html = doc_engine.render_document(doc_engine.list_document_elements(slug, page_id))

    assert 'data-kind="row"' in html
    assert 'data-kind="titre"' in html
    assert f'data-element-id="{titre_id}"' in html


def test_move_document_element_to_page_transfers_a_top_level_element(tmp_support_slug_cleanup: Any) -> None:
    slug, page1_id = _new_support(tmp_support_slug_cleanup)
    page2_id = doc_engine.add_document_page(slug)
    element_id = doc_engine.add_document_element(slug, "titre", page_id=page1_id)

    doc_engine.move_document_element_to_page(slug, element_id, page2_id)

    moved = doc_engine.get_document_element(slug, element_id)
    assert moved is not None
    assert moved["page_id"] == page2_id
    assert moved["parent_id"] is None
    assert [el["id"] for el in doc_engine.list_document_elements(slug, page1_id)] == []
    assert [el["id"] for el in doc_engine.list_document_elements(slug, page2_id)] == [element_id]


def test_move_document_element_to_page_cascades_row_children(tmp_support_slug_cleanup: Any) -> None:
    slug, page1_id = _new_support(tmp_support_slug_cleanup)
    page2_id = doc_engine.add_document_page(slug)
    row_id = doc_engine.add_document_element(slug, "row", page_id=page1_id)
    child_id = doc_engine.add_document_element(slug, "titre", page_id=page1_id, parent_id=row_id)

    doc_engine.move_document_element_to_page(slug, row_id, page2_id)

    child = doc_engine.get_document_element(slug, child_id)
    assert child is not None
    assert child["page_id"] == page2_id
    assert child["parent_id"] == row_id
    page2_ids = {el["id"] for el in doc_engine.list_document_elements(slug, page2_id)}
    assert page2_ids == {row_id, child_id}


def test_move_document_element_to_page_renumbers_remaining_siblings(tmp_support_slug_cleanup: Any) -> None:
    slug, page1_id = _new_support(tmp_support_slug_cleanup)
    page2_id = doc_engine.add_document_page(slug)
    first_id = doc_engine.add_document_element(slug, "titre", page_id=page1_id)
    second_id = doc_engine.add_document_element(slug, "paragraphe", page_id=page1_id)
    third_id = doc_engine.add_document_element(slug, "image", page_id=page1_id)

    doc_engine.move_document_element_to_page(slug, second_id, page2_id)

    remaining = doc_engine.list_document_elements(slug, page1_id)
    remaining_ordered = sorted(remaining, key=lambda el: el["order_index"])
    assert [el["id"] for el in remaining_ordered] == [first_id, third_id]
    assert [el["order_index"] for el in remaining_ordered] == [0, 1]


def test_move_document_element_to_page_on_missing_id_is_a_noop(tmp_support_slug_cleanup: Any) -> None:
    slug, page1_id = _new_support(tmp_support_slug_cleanup)
    page2_id = doc_engine.add_document_page(slug)
    doc_engine.move_document_element_to_page(slug, 999, page2_id)
    assert doc_engine.list_document_elements(slug, page1_id) == []
    assert doc_engine.list_document_elements(slug, page2_id) == []