"""ai/chat.py — la boucle tool-use (voir plan Phase 2, §5). Jamais un
vrai appel à l'API Claude ici : client.messages.create est monkeypatché
par une fausse classe qui rejoue une séquence de réponses programmée."""

from collections.abc import Callable
from typing import Any

import pytest
from flask.testing import FlaskClient

import ai
import db
import game_engine
from tests.conftest import not_none


def _create_jeu2d_game_with_conversation(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str], name: str = "pytest_ai_chat"
) -> Any:
    resp = client.post("/games/new", data={"name": name}, follow_redirects=False)
    slug = tmp_game_slug_cleanup(resp.headers["Location"].rstrip("/").split("/")[-1])
    screen_id = game_engine.create_screen(slug, "Scène 1", kind="jeu_2d")
    conversation_id = game_engine.create_ia_conversation(slug, screen_id)
    return slug, screen_id, conversation_id


class _FakeBlock:
    def __init__(
        self, type: str, text: str | None = None, id: str | None = None, name: str | None = None, input: Any = None
    ) -> None:
        self.type = type
        self.text = text
        self.id = id
        self.name = name
        self.input = input or {}


class _FakeResponse:
    def __init__(self, content: Any, stop_reason: Any) -> None:
        self.content = content
        self.stop_reason = stop_reason


class _FakeMessages:
    def __init__(self, responses: Any) -> None:
        self._responses = list(responses)
        self.call_count = 0
        self.last_kwargs: dict[str, Any] | None = None

    def create(self, **kwargs: Any) -> Any:
        self.call_count += 1
        self.last_kwargs = kwargs
        if len(self._responses) > 1:
            return self._responses.pop(0)
        return self._responses[0]  # rejoue la dernière indéfiniment (voir test de la borne)


class _FakeClient:
    def __init__(self, responses: Any) -> None:
        self.messages = _FakeMessages(responses)


def test_run_chat_turn_returns_text_directly_when_no_tool_is_used(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str], monkeypatch: pytest.MonkeyPatch
) -> None:
    slug, screen_id, conversation_id = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    fake_client = _FakeClient([_FakeResponse([_FakeBlock("text", text="Bonjour, que veux-tu créer ?")], "end_turn")])
    monkeypatch.setattr("ai.chat.get_client", lambda: fake_client)

    reply = ai.run_chat_turn(slug, screen_id, conversation_id, 1, "Salut")
    assert reply == "Bonjour, que veux-tu créer ?"
    assert fake_client.messages.call_count == 1


def test_run_chat_turn_dispatches_a_tool_call_then_returns_the_final_text(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str], monkeypatch: pytest.MonkeyPatch
) -> None:
    slug, screen_id, conversation_id = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    tool_use_response = _FakeResponse(
        [
            _FakeBlock(
                "tool_use",
                id="t1",
                name="create_global_variable",
                input={"name": "score_ia", "var_type": "nombre_entier"},
            )
        ],
        "tool_use",
    )
    final_response = _FakeResponse([_FakeBlock("text", text="Variable créée.")], "end_turn")
    fake_client = _FakeClient([tool_use_response, final_response])
    monkeypatch.setattr("ai.chat.get_client", lambda: fake_client)

    reply = ai.run_chat_turn(slug, screen_id, conversation_id, 1, "Crée une variable score_ia")
    assert reply == "Variable créée."
    names = [v["name"] for v in db.list_global_variables(slug)]
    assert "score_ia" in names


def test_run_chat_turn_stops_after_the_max_iterations_even_if_claude_keeps_calling_tools(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str], monkeypatch: pytest.MonkeyPatch
) -> None:
    slug, screen_id, conversation_id = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    always_tool_use = _FakeResponse(
        [_FakeBlock("tool_use", id="t1", name="create_global_variable", input={"name": "boucle_infinie"})],
        "tool_use",
    )
    fake_client = _FakeClient([always_tool_use])
    monkeypatch.setattr("ai.chat.get_client", lambda: fake_client)

    reply = ai.run_chat_turn(slug, screen_id, conversation_id, 1, "Fais quelque chose")
    assert fake_client.messages.call_count == ai.chat._MAX_TOOL_ITERATIONS
    assert reply == "(pas de réponse textuelle)"


def test_run_chat_turn_explains_when_cut_short_by_max_tokens(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str], monkeypatch: pytest.MonkeyPatch
) -> None:
    """Bug corrigé : max_tokens=4096 pouvait couper Claude EN PLEINE
    RÉFLEXION sur une demande riche, avant le moindre appel d'outil —
    symptôme observé : "(pas de réponse textuelle)" dès le premier tour,
    aucune progression. Message désormais plus clair pour le créateur."""
    slug, screen_id, conversation_id = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    cut_short = _FakeResponse([], "max_tokens")  # aucun bloc texte, coupé en cours de réflexion
    fake_client = _FakeClient([cut_short])
    monkeypatch.setattr("ai.chat.get_client", lambda: fake_client)

    reply = ai.run_chat_turn(slug, screen_id, conversation_id, 1, "Fais quelque chose de complexe")
    assert "interrompue" in reply
    assert fake_client.messages.call_count == 1  # stop_reason != "tool_use" -> sort dès le premier tour


def test_run_chat_turn_uses_a_generous_max_tokens_not_the_old_lowballed_value(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str], monkeypatch: pytest.MonkeyPatch
) -> None:
    slug, screen_id, conversation_id = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    fake_client = _FakeClient([_FakeResponse([_FakeBlock("text", text="ok")], "end_turn")])
    monkeypatch.setattr("ai.chat.get_client", lambda: fake_client)

    ai.run_chat_turn(slug, screen_id, conversation_id, 1, "Salut")
    assert not_none(fake_client.messages.last_kwargs)["max_tokens"] >= 16000


def test_run_chat_turn_raises_when_anthropic_is_not_configured(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str]
) -> None:
    slug, screen_id, conversation_id = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    try:
        ai.run_chat_turn(slug, screen_id, conversation_id, 1, "Salut")
        raise AssertionError("devrait lever AnthropicNotConfiguredError")
    except ai.AnthropicNotConfiguredError:
        pass


# ---------- État de scène ré-injecté à chaque tour (bug corrigé : Ruby
# dupliquait des objets faute de voir ce qui existait déjà) ----------


def test_describe_scene_state_reports_dimensions_and_no_objects(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str]
) -> None:
    slug, screen_id, _ = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    description = ai.chat._describe_scene_state(slug, screen_id)
    assert "0 à 960" in description and "0 à 540" in description
    assert "Aucun objet" in description


def test_describe_scene_state_lists_existing_objects_with_role_and_trigger_flag(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str]
) -> None:
    slug, screen_id, _ = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    player_id = game_engine.add_scene_object(slug, screen_id, kind="personnage")
    game_engine.set_scene_object_role(slug, player_id, "joueur")
    pnj_id = game_engine.add_scene_object(slug, screen_id, kind="personnage")
    game_engine.set_scene_object_collision_rules(
        slug,
        pnj_id,
        game_engine.sanitize_collision_rules(
            [
                {"trigger": "collision", "action": {"type": "dialogue", "dialogue": {"id": "d_1", "lines": []}}},
            ]
        ),
    )

    description = ai.chat._describe_scene_state(slug, screen_id)
    assert f"id={player_id}" in description
    assert "rôle=joueur" in description
    assert f"id={pnj_id}" in description
    assert "rôle=pnj" in description
    assert "[déclencheur déjà configuré]" in description


def test_describe_scene_state_reports_no_screen_trigger_by_default(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str]
) -> None:
    slug, screen_id, _ = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    description = ai.chat._describe_scene_state(slug, screen_id)
    assert "Aucun déclencheur d'écran" in description


def test_describe_scene_state_reports_an_existing_screen_trigger(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str]
) -> None:
    slug, screen_id, _ = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    game_engine.set_screen_triggers(
        slug,
        screen_id,
        game_engine.sanitize_screen_triggers(
            [
                {"trigger": "affichage", "action": {"type": "dialogue"}},
            ]
        ),
    )
    description = ai.chat._describe_scene_state(slug, screen_id)
    assert "1 déclencheur(s) D'ÉCRAN" in description


def test_system_prompt_documents_the_new_triggers_and_actions() -> None:
    """Bug à éviter : ajouter un type de déclencheur/action côté moteur
    (game_engine/rendering/collision_rules.py) sans jamais le documenter dans
    le system prompt le rendrait invisible pour Ruby malgré l'outil qui
    l'accepte techniquement."""
    prompt = ai.chat._SYSTEM_PROMPT
    for keyword in (
        '"clic"',
        '"survol"',
        '"affichage"',
        "surbrillance",
        "visibilite",
        '"son"',
        '"video"',
        "indication",
    ):
        assert keyword in prompt, keyword


def test_system_prompt_asks_ruby_to_clarify_ambiguous_trigger_choice() -> None:
    assert "pose la question" in ai.chat._SYSTEM_PROMPT


def test_system_prompt_asks_ruby_to_clarify_interagir_vs_immediate_action() -> None:
    assert "interagir" in ai.chat._SYSTEM_PROMPT
    assert "APPUYER SUR UNE TOUCHE" in ai.chat._SYSTEM_PROMPT


def test_system_prompt_documents_the_quiz_box_config_tool() -> None:
    """Demande explicite : "Ruby dois pouvoir aussi piloter ces réglages"
    (plein écran/minuteur/modèle d'un quiz autonome) — pas seulement
    l'éditeur manuel."""
    prompt = ai.chat._SYSTEM_PROMPT
    assert "set_quiz_box_config" in prompt
    for keyword in ("fullscreen", "timer_mode", "dialog_template", "page_template"):
        assert keyword in prompt, keyword


def test_system_prompt_asks_ruby_to_clarify_the_timer_before_enabling_it() -> None:
    assert "jamais imposé" in ai.chat._SYSTEM_PROMPT


def test_system_prompt_documents_the_two_quiz_template_categories() -> None:
    """Demande explicite : "Ruby doit également comprendre cette
    distinction" (modèles "boîte de dialogue" hors plein écran vs modèles
    "page de quiz" en plein écran, structures HTML totalement séparées)."""
    prompt = ai.chat._SYSTEM_PROMPT
    assert "page de quiz" in prompt
    assert "manga" in prompt


# ---------- Écran supprimé pendant qu'une conversation IA existe encore
# ----------
#
# Comportement RÉEL vérifié en creusant ce chantier de typage (voir
# ai/chat.py::ScreenDeletedError, game_engine/screens_repo/delete_screen.py) :
# _ia_conversations.screen_id porte déjà ON DELETE CASCADE vers _screens
# (voir game_engine/ia/ensure_ia_chat_schema.py) — supprimer un écran nettoie
# donc DÉJÀ ses conversations/messages automatiquement, sans code
# applicatif dédié. ScreenDeletedError (ai/chat.py) reste un garde-fou
# purement défensif pour get_screen() -> None (Optional), pas le
# traitement d'un cas normalement atteignable via l'appli.


def test_deleting_the_screen_cascades_to_remove_its_ia_conversations_and_messages(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str]
) -> None:
    slug, screen_id, conversation_id = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    game_engine.add_ia_chat_message(slug, conversation_id, "user", "Salut")

    game_engine.delete_screen(slug, screen_id)

    conn = db.connect(slug)
    remaining_conversations = conn.execute(
        "SELECT COUNT(*) AS n FROM _ia_conversations WHERE screen_id = ?", (screen_id,)
    ).fetchone()["n"]
    remaining_messages = conn.execute(
        "SELECT COUNT(*) AS n FROM _ia_chat_messages WHERE conversation_id = ?", (conversation_id,)
    ).fetchone()["n"]
    conn.close()
    assert remaining_conversations == 0
    assert remaining_messages == 0


def test_describe_scene_state_raises_a_clear_error_for_a_nonexistent_screen(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str]
) -> None:
    """game_engine.get_screen() renvoie dict | None — jamais atteint via
    l'appli normale (voir le commentaire de module ci-dessus), mais
    _describe_scene_state doit rester correcte pour ce cas plutôt que de
    planter avec un TypeError cru sur un accès à None."""
    slug, _screen_id, _conversation_id = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    try:
        ai.chat._describe_scene_state(slug, 999999)
        raise AssertionError("devrait lever ScreenDeletedError")
    except ai.chat.ScreenDeletedError:
        pass


def test_run_chat_turn_gives_a_clear_message_instead_of_crashing_for_a_nonexistent_screen(
    client: FlaskClient,
    tmp_game_slug_cleanup: Callable[[str], str],
) -> None:
    slug, screen_id, conversation_id = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    # screen_id inexistant (jamais créé) plutôt que l'écran réel de la
    # conversation : reproduit directement l'état que ScreenDeletedError
    # doit couvrir, sans avoir à contourner la contrainte FK réelle.
    # Aucun monkeypatch de get_client ici, exprès : si le garde-fou
    # appelait le client Claude avant de vérifier l'écran, ce test
    # échouerait avec AnthropicNotConfiguredError (aucune clé en
    # environnement de test) plutôt qu'avec le bon message.
    reply = ai.run_chat_turn(slug, 999999, conversation_id, 1, "Salut")
    assert reply == "Cet écran a été supprimé — cette conversation n'est plus utilisable."


def test_run_chat_turn_passes_the_scene_state_in_the_system_prompt(
    client: FlaskClient, tmp_game_slug_cleanup: Callable[[str], str], monkeypatch: pytest.MonkeyPatch
) -> None:
    slug, screen_id, conversation_id = _create_jeu2d_game_with_conversation(client, tmp_game_slug_cleanup)
    game_engine.add_scene_object(slug, screen_id, kind="personnage")
    fake_client = _FakeClient([_FakeResponse([_FakeBlock("text", text="ok")], "end_turn")])
    monkeypatch.setattr("ai.chat.get_client", lambda: fake_client)

    ai.run_chat_turn(slug, screen_id, conversation_id, 1, "Salut")
    system_prompt = not_none(fake_client.messages.last_kwargs)["system"]
    assert "0 à 960" in system_prompt and "0 à 540" in system_prompt
    assert "1 objet(s)" in system_prompt