"""`sim/stations.py` — the station events: kinds, payloads, positions, order.

A completion is the stage event (if the kind has one — the prep has none:
there is no `plated` `EventKind`, its completion is the `READY` alone), then
the `READY`, in that order, at the fixture, stamped with the state's tick:

* `CHOPPED` / `COOKED` / `WASHED` carry `{"station", "item", "form", "tick"}`;
* `READY` carries `{"station", "tick"}`;
* nothing fires before the work is done, and an idle kitchen fires nothing
  (the committed replay goldens rest on that).
"""

from __future__ import annotations

from collections.abc import Sequence
from dataclasses import replace

import pytest

from undercooked.sim.grid import Grid
from undercooked.sim.model import (
    Event,
    EventKind,
    Facing,
    Item,
    ItemForm,
    ItemKind,
    KitchenState,
    Player,
    PlayerState,
    Station,
    StationKind,
    StationState,
    TileKind,
    Vec2,
)
from undercooked.sim.stations import step_stations
from undercooked.sim.step import STEP_DT, PlayerInput, step

pytestmark = pytest.mark.unit

WIDTH, HEIGHT = 13, 9


# --- fixtures ---------------------------------------------------------------------------


def make_state(
    stations: tuple[Station, ...] = (),
    players: tuple[Player, ...] = (),
    tick: int = 0,
) -> KitchenState:
    return KitchenState(
        level_id="04_station_events",
        seed=13,
        grid=Grid(width=WIDTH, height=HEIGHT, tiles=(TileKind.FLOOR,) * (WIDTH * HEIGHT)),
        tick=tick,
        stations=stations,
        players=players,
        target_score=40,
        time_left=90.0,
    )


def cook(player_id: str = "p0", *, seat: int = 0) -> Player:
    # in reach of the fixture at (5, 4), holding — the stage-4 progress driver
    return Player(
        id=player_id,
        pos=Vec2(5.5, 5.5),
        facing=Facing.UP,
        state=PlayerState.IDLE,
        seat=seat,
        action_held_ticks=1,
    )


def working_station(
    kind: StationKind,
    contents: tuple[Item, ...],
    duration: float,
    *,
    x: int = 5,
    y: int = 4,
) -> Station:
    return Station(
        id=f"{kind.value}-{x}-{y}",
        kind=kind,
        x=x,
        y=y,
        state=StationState.WORKING,
        contents=contents,
        worker_id="p0",
        duration=duration,
    )


def item(kind: ItemKind, form: ItemForm = ItemForm.RAW) -> Item:
    return Item(kind=kind, form=form)


def ticks(duration: float) -> int:
    return round(duration / STEP_DT)


def run_to_ready(state: KitchenState, duration: float) -> tuple[KitchenState, tuple[Event, ...]]:
    """Drive the work to its completion substep and return that substep's events."""
    for _ in range(ticks(duration) - 1):
        state, produced = step_stations(state, STEP_DT)
        assert produced == ()  # nothing fires before the work is done
    return step_stations(state, STEP_DT)


def kinds(events: Sequence[Event]) -> list[EventKind]:
    return [EventKind(str(event.kind)) for event in events]


# --- the stage event, then READY, in order ---------------------------------------------


def test_chop_completes_with_a_chopped_event_then_ready() -> None:
    state = make_state(
        stations=(working_station(StationKind.CHOP_BOARD, (item(ItemKind.LETTUCE),), 0.9),),
        players=(cook(),),
    )
    _state, events = run_to_ready(state, 0.9)
    assert kinds(events) == [EventKind.CHOPPED, EventKind.READY]
    assert dict(events[0].payload) == {
        "station": "chop_board-5-4",
        "item": "lettuce",
        "form": "chopped",
        "tick": 0,
    }
    assert dict(events[1].payload) == {"station": "chop_board-5-4", "tick": 0}


def test_cook_completes_with_a_cooked_event_then_ready() -> None:
    state = make_state(
        stations=(
            working_station(
                StationKind.STOVE, (item(ItemKind.RICE, ItemForm.CHOPPED),), 6.0
            ),
        ),
        players=(cook(),),
    )
    _state, events = run_to_ready(state, 6.0)
    assert kinds(events) == [EventKind.COOKED, EventKind.READY]
    assert dict(events[0].payload) == {
        "station": "stove-5-4",
        "item": "rice",
        "form": "cooked",
        "tick": 0,
    }
    assert dict(events[1].payload) == {"station": "stove-5-4", "tick": 0}


def test_wash_completes_with_a_washed_event_then_ready() -> None:
    state = make_state(
        stations=(
            working_station(
                StationKind.SINK, (item(ItemKind.PLATE, ItemForm.DIRTY),), 1.2
            ),
        ),
        players=(cook(),),
    )
    _state, events = run_to_ready(state, 1.2)
    assert kinds(events) == [EventKind.WASHED, EventKind.READY]
    assert dict(events[0].payload) == {
        "station": "sink-5-4",
        "item": "plate",
        "form": "raw",  # the dirt goes, the prop comes back clean
        "tick": 0,
    }
    assert dict(events[1].payload) == {"station": "sink-5-4", "tick": 0}


def test_prep_completes_with_ready_only() -> None:
    """The prep has no stage event: its completion is the `READY` alone."""
    state = make_state(
        stations=(
            working_station(
                StationKind.PREP, (item(ItemKind.TOMATO, ItemForm.COOKED),), 0.6
            ),
        ),
        players=(cook(),),
    )
    _state, events = run_to_ready(state, 0.6)
    assert kinds(events) == [EventKind.READY]
    assert dict(events[0].payload) == {"station": "prep-5-4", "tick": 0}


def test_an_in_place_wash_emits_washed_then_ready() -> None:
    """The dirty work station's in-place wash: `WASHED` (no item — the prop is the
    fixture's, its contents are set-down objects), then `READY`."""
    state = make_state(
        stations=(
            Station(
                id="prep-5-4",
                kind=StationKind.PREP,
                x=5,
                y=4,
                state=StationState.WORKING,
                dirty=True,
                worker_id="p0",
                duration=1.2,
            ),
        ),
        players=(cook(),),
    )
    _state, events = run_to_ready(state, 1.2)
    assert kinds(events) == [EventKind.WASHED, EventKind.READY]
    assert dict(events[0].payload) == {"station": "prep-5-4", "tick": 0}
    assert dict(events[1].payload) == {"station": "prep-5-4", "tick": 0}


# --- positions, order, the stamp -------------------------------------------------------


def test_events_are_at_the_fixture_and_stamped_with_the_state_tick() -> None:
    state = make_state(
        stations=(working_station(StationKind.CHOP_BOARD, (item(ItemKind.TOMATO),), 0.9),),
        players=(cook(),),
        tick=41,
    )
    _state, events = run_to_ready(state, 0.9)
    for event in events:
        assert event.x == 5.0
        assert event.y == 4.0
        assert dict(event.payload)["tick"] == 41


def test_two_stations_completing_in_one_substep_emit_in_station_order() -> None:
    state = make_state(
        stations=(
            working_station(StationKind.CHOP_BOARD, (item(ItemKind.TOMATO),), 0.9),
            working_station(
                StationKind.PREP,
                (item(ItemKind.LETTUCE, ItemForm.COOKED),),
                0.6,
                x=7,
            ),
        ),
        players=(
            cook(),
            Player(
                id="p1",
                pos=Vec2(7.5, 5.5),
                facing=Facing.UP,
                state=PlayerState.IDLE,
                seat=1,
                action_held_ticks=1,
            ),
        ),
    )
    state = replace_worker(state, "prep-7-4", "p1")
    # the prep (12 substeps) finishes before the board (18): its `READY` alone first
    for _ in range(ticks(0.6) - 1):
        state, produced = step_stations(state, STEP_DT)
        assert produced == ()
    state, events = step_stations(state, STEP_DT)
    assert kinds(events) == [EventKind.READY]
    assert dict(events[0].payload)["station"] == "prep-7-4"
    # then the board's stage event + ready: substeps 13-17 are still midstream
    for _ in range(ticks(0.9) - 12 - 1):
        state, produced = step_stations(state, STEP_DT)
        assert produced == ()
    state, events = step_stations(state, STEP_DT)
    assert kinds(events) == [EventKind.CHOPPED, EventKind.READY]
    assert dict(events[0].payload)["station"] == "chop_board-5-4"


def replace_worker(state: KitchenState, station_id: str, worker_id: str) -> KitchenState:
    """`state` with one station's `worker_id` set (the fixture's default is `p0`)."""
    return replace(
        state,
        stations=tuple(
            replace(s, worker_id=worker_id) if s.id == station_id else s
            for s in state.stations
        ),
    )


def test_no_events_fire_while_the_work_is_midstream() -> None:
    state = make_state(
        stations=(working_station(StationKind.STOVE, (item(ItemKind.TOMATO),), 8.0),),
        players=(cook(),),
    )
    for _ in range(ticks(8.0) - 1):
        state, produced = step_stations(state, STEP_DT)
        assert produced == ()
    assert state.stations[0].state is StationState.WORKING


def test_an_idle_kitchen_fires_no_events() -> None:
    state = make_state(
        stations=(
            Station(id="prep-5-4", kind=StationKind.PREP, dirty=True),
            Station(id="stove-9-4", kind=StationKind.STOVE, x=9),
        ),
        players=(cook(),),
    )
    for _ in range(5):
        state, produced = step_stations(state, STEP_DT)
        assert produced == ()


# --- the kernel delivers the station events (integration) -------------------------------


def test_the_kernel_delivers_the_station_events_on_the_completion_substep() -> None:
    """Through `step()`: the `CHOPPED`/`READY` pair arrives on the 18th substep,
    stamped with the substep's tick (the kernel increments after stage 4)."""
    state = make_state(
        stations=(
            Station(
                id="chop_board-5-4",
                kind=StationKind.CHOP_BOARD,
                x=5,
                y=4,
                contents=(item(ItemKind.TOMATO),),
            ),
        ),
        players=(
            Player(
                id="p0",
                pos=Vec2(5.5, 5.5),
                facing=Facing.UP,
                state=PlayerState.IDLE,
                seat=0,
            ),
        ),
    )
    for substep in range(1, ticks(0.9)):
        state, events = step(
            state,
            STEP_DT,
            (PlayerInput(player_id="p0", seq=substep, action=True, received_at_tick=state.tick),),
        )
        assert kinds(events) == []  # the press substep starts the work; it does not complete it
        assert state.stations[0].state is StationState.WORKING
    state, events = step(
        state,
        STEP_DT,
        (PlayerInput(player_id="p0", seq=ticks(0.9), action=True, received_at_tick=state.tick),),
    )
    assert kinds(events) == [EventKind.CHOPPED, EventKind.READY]
    # the substep's tick, stamped before the kernel's increment
    assert dict(events[0].payload)["tick"] == ticks(0.9) - 1
    assert state.stations[0].state is StationState.READY