"""apply_directives is the only mutator — pin its behaviour: scene change, new character,
relationship clamp, exit, and ending."""

from __future__ import annotations

from visualnovel import state
from visualnovel.schemas import (
    Character,
    Directives,
    DirectorOutput,
    Ending,
    GameState,
    NewCharacter,
    Scene,
    SceneChange,
)


def _state() -> GameState:
    return GameState(
        seed=1,
        vibe="v",
        style_guide="s",
        scene=Scene(id="a", place="A", present=["moth"]),
        characters={"moth": Character(id="moth", name="Moth", relationship=95)},
    )


def test_scene_change_and_relationship_clamp():
    s = _state()
    out = DirectorOutput(
        speaker="moth",
        dialogue="hi",
        emotion="joy",
        directives=Directives(
            scene_change=SceneChange(place="The Hollow Stair", description="d", mood="eerie"),
            relationship_delta=50,  # 95 + 50 -> clamped to 100
        ),
    )
    effects = state.apply_directives(s, out)
    assert "scene_changed" in effects
    assert s.scene.place == "The Hollow Stair"
    assert s.scene.present == ["moth"]  # people carry across a move
    assert s.characters["moth"].relationship == 100  # clamped
    assert s.characters["moth"].mood == "joy"


def test_newcomer_speaker_gets_mood_applied():
    # new_character is processed before the speaker block, so an arriving newcomer
    # who speaks this turn gets their emotion applied (drives their first sprite)
    s = _state()
    out = DirectorOutput(
        speaker="fox",
        dialogue="Oh! You noticed me?",
        emotion="shy",
        directives=Directives(
            new_character=NewCharacter(
                id="fox", name="Fen", one_line="a sly fox", appearance="russet"
            )
        ),
    )
    effects = state.apply_directives(s, out)
    assert "new_character:fox" in effects
    assert s.characters["fox"].mood == "shy"


def test_new_character_joins_stage():
    s = _state()
    out = DirectorOutput(
        speaker="moth",
        dialogue="look",
        directives=Directives(
            new_character=NewCharacter(
                id="fox", name="Fen", one_line="a sly fox", appearance="russet"
            )
        ),
    )
    effects = state.apply_directives(s, out)
    assert "new_character:fox" in effects
    assert "fox" in s.characters and "fox" in s.scene.present
    assert s.characters["fox"].sprite_seed != 0  # pinned seed assigned


def test_remember_fact_appends_dedupes_and_caps():
    s = _state()
    for i in range(9):  # 9 distinct facts -> capped at 8, oldest dropped
        out = DirectorOutput(
            speaker="moth", dialogue="x", directives=Directives(remember_fact=f"fact {i}")
        )
        effects = state.apply_directives(s, out)
        assert "fact:moth" in effects
    # duplicate is ignored
    out = DirectorOutput(
        speaker="moth", dialogue="x", directives=Directives(remember_fact="fact 8")
    )
    effects = state.apply_directives(s, out)
    assert "fact:moth" not in effects
    facts = s.characters["moth"].known_facts
    assert len(facts) == 8
    assert "fact 0" not in facts and "fact 8" in facts


def test_milestone50_lifecycle():
    from visualnovel import memory

    s = _state()
    s.characters["moth"].relationship = 45
    # crossing 50 arms the milestone
    out = DirectorOutput(speaker="moth", dialogue="x", directives=Directives(relationship_delta=10))
    effects = state.apply_directives(s, out)
    assert "milestone50:moth" in effects
    assert s.flags["milestone50_moth"] == "pending"
    # the next context assembly injects the hint exactly while pending
    ctx = memory.assemble_context(s, "hello")
    assert "GROWING CLOSE" in ctx
    # the next apply retires it, and a further delta does not re-arm
    out2 = DirectorOutput(speaker="moth", dialogue="y", directives=Directives(relationship_delta=5))
    effects2 = state.apply_directives(s, out2)
    assert s.flags["milestone50_moth"] == "done"
    assert "milestone50:moth" not in effects2
    assert "GROWING CLOSE" not in memory.assemble_context(s, "hello")


def test_advance_beat_rate_limited():
    s = _state()
    # too early: beat_started_turn defaults to 0 and turn_index is 0
    out = DirectorOutput(speaker="moth", dialogue="x", directives=Directives(advance_beat=True))
    effects = state.apply_directives(s, out)
    assert "beat" not in effects and s.beat == "opening"
    # after 4 turns in the beat, the advance is honoured
    s.turn_index = 4
    effects = state.apply_directives(s, out)
    assert "beat" in effects and s.beat == "rising"
    # and immediately advancing again is blocked
    s.turn_index = 5
    effects = state.apply_directives(s, out)
    assert "beat" not in effects and s.beat == "rising"


def test_exit_and_ending():
    s = _state()
    s.scene.present.append("fox")
    s.characters["fox"] = Character(id="fox", name="Fen")
    out = DirectorOutput(
        speaker="moth",
        dialogue="farewell",
        directives=Directives(
            exit_character="fox",
            ending=Ending(kind="warm", text="And the wood let you go, gently."),
        ),
    )
    effects = state.apply_directives(s, out)
    assert "exit_character:fox" in effects and "fox" not in s.scene.present
    assert s.beat == "ended" and s.flags["ending_kind"] == "warm"