"""状態遷移マシンのテスト"""

import pytest
import time
from unittest.mock import patch

from rock_paper_scissors.game.state_machine import StateMachine
from rock_paper_scissors.game.states import GameState, Hand, GameResult


class TestStateMachine:
    """状態遷移のテスト"""

    def test_initial_state_is_idle(self):
        """初期状態はIDLE"""
        sm = StateMachine()
        assert sm.state == GameState.IDLE

    def test_wave_detected_from_idle_transitions_to_countdown(self):
        """手振り検出でIDLE→COUNTDOWN（直接カウントダウン開始）"""
        sm = StateMachine()
        assert sm.state == GameState.IDLE
        sm.on_wave_detected()
        assert sm.state == GameState.COUNTDOWN
        assert sm.countdown_step == 3

    def test_countdown_tick(self):
        """カウントダウンが進む"""
        sm = StateMachine()
        sm._state = GameState.COUNTDOWN
        sm._countdown_step = 3

        assert sm.on_countdown_tick() is True  # 3→2
        assert sm.countdown_step == 2

        assert sm.on_countdown_tick() is True  # 2→1
        assert sm.countdown_step == 1

        assert sm.on_countdown_tick() is False  # 1→0（PLAY遷移）
        assert sm.state == GameState.PLAY

    def test_play_sets_reachy_hand(self):
        """PLAY状態でReachyの手が設定される"""
        sm = StateMachine()
        sm._state = GameState.COUNTDOWN
        sm._countdown_step = 1
        sm.on_countdown_tick()

        assert sm.state == GameState.PLAY
        assert sm.reachy_hand in [Hand.ROCK, Hand.PAPER, Hand.SCISSORS]

    def test_user_hand_detected_transitions_to_react(self):
        """ユーザーの手検出でPLAY→REACT（最小表示時間経過後）"""
        sm = StateMachine()
        sm._state = GameState.PLAY
        sm._state_start_time = time.time() - 10  # 十分な時間経過
        sm._reachy_hand = Hand.ROCK

        sm.on_user_hand_detected(Hand.SCISSORS)

        assert sm.state == GameState.REACT
        assert sm.user_hand == Hand.SCISSORS
        assert sm.game_result == GameResult.WIN

    def test_react_complete_transitions_to_idle(self):
        """REACT完了でREACT→IDLE"""
        sm = StateMachine()
        sm._state = GameState.REACT
        sm._reachy_hand = Hand.ROCK
        sm._user_hand = Hand.SCISSORS
        sm._game_result = GameResult.WIN

        sm.on_react_complete()

        assert sm.state == GameState.IDLE
        assert sm.reachy_hand is None
        assert sm.user_hand is None
        assert sm.game_result is None

    def test_force_idle(self):
        """異常時にIDLEに強制遷移"""
        sm = StateMachine()
        sm._state = GameState.PLAY
        sm._reachy_hand = Hand.ROCK

        sm.force_idle()

        assert sm.state == GameState.IDLE
        assert sm.reachy_hand is None

    def test_state_change_callback(self):
        """状態変更時のコールバックが呼ばれる"""
        sm = StateMachine()
        callback_args = []

        def callback(old_state, new_state):
            callback_args.append((old_state, new_state))

        sm.set_on_state_change(callback)
        sm.on_wave_detected()

        assert len(callback_args) == 1
        assert callback_args[0] == (GameState.IDLE, GameState.COUNTDOWN)

    def test_full_game_flow(self):
        """フルゲームフロー: IDLE → COUNTDOWN → PLAY → REACT → IDLE"""
        sm = StateMachine()

        # IDLE → COUNTDOWN
        assert sm.state == GameState.IDLE
        sm.on_wave_detected()
        assert sm.state == GameState.COUNTDOWN
        assert sm.countdown_step == 3

        # COUNTDOWN → PLAY
        sm.on_countdown_tick()  # 3→2
        sm.on_countdown_tick()  # 2→1
        sm.on_countdown_tick()  # 1→0 → PLAY
        assert sm.state == GameState.PLAY
        assert sm.reachy_hand is not None

        # PLAY: ユーザーの手を検出（最小表示時間前）
        sm.on_user_hand_detected(Hand.PAPER)
        assert sm.state == GameState.PLAY  # まだ遷移しない
        assert sm.user_hand == Hand.PAPER

        # 最小表示時間経過をシミュレート
        sm._state_start_time = time.time() - 10

        # PLAY → REACT（update経由で遷移）
        sm.update()
        assert sm.state == GameState.REACT
        assert sm.game_result is not None

        # REACT → IDLE
        sm.on_react_complete()
        assert sm.state == GameState.IDLE
        assert sm.reachy_hand is None


class TestStateMachineAutoTransitions:
    """自動状態遷移のテスト"""

    def test_react_auto_transitions_to_idle_after_duration(self):
        """REACT状態は一定時間後にIDLEへ自動遷移"""
        sm = StateMachine()
        sm._state = GameState.REACT
        sm._state_start_time = time.time() - 10  # 十分な時間経過

        changed = sm.update()

        assert changed is True
        assert sm.state == GameState.IDLE


class TestPlayMinDuration:
    """PLAY状態の最小表示時間（手を確認する間）のテスト"""

    def test_user_hand_not_processed_before_min_duration(self):
        """最小表示時間前はユーザーの手を検出してもREACTに遷移しない"""
        sm = StateMachine()
        sm._state = GameState.PLAY
        sm._state_start_time = time.time()  # 今入ったばかり
        sm._reachy_hand = Hand.ROCK

        # ユーザーの手を検出
        sm.on_user_hand_detected(Hand.SCISSORS)

        # まだREACTに遷移していない
        assert sm.state == GameState.PLAY
        # ユーザーの手は保存されている
        assert sm.user_hand == Hand.SCISSORS

    def test_user_hand_processed_after_min_duration(self):
        """最小表示時間後はユーザーの手検出でREACTに遷移する"""
        sm = StateMachine()
        sm._state = GameState.PLAY
        sm._state_start_time = time.time() - 10  # 十分な時間経過
        sm._reachy_hand = Hand.ROCK

        # ユーザーの手を検出
        sm.on_user_hand_detected(Hand.SCISSORS)

        # REACTに遷移
        assert sm.state == GameState.REACT
        assert sm.game_result == GameResult.WIN

    def test_pending_hand_processed_on_update_after_min_duration(self):
        """保留中の手は最小表示時間経過後のupdateでREACTに遷移する"""
        sm = StateMachine()
        sm._state = GameState.PLAY
        sm._state_start_time = time.time()  # 今入ったばかり
        sm._reachy_hand = Hand.ROCK

        # ユーザーの手を検出（まだ遷移しない）
        sm.on_user_hand_detected(Hand.SCISSORS)
        assert sm.state == GameState.PLAY
        assert sm.user_hand == Hand.SCISSORS

        # 時間経過をシミュレート
        sm._state_start_time = time.time() - 10

        # updateで遷移
        changed = sm.update()

        assert changed is True
        assert sm.state == GameState.REACT
        assert sm.game_result == GameResult.WIN

    def test_update_does_not_transition_without_user_hand(self):
        """ユーザーの手がない状態ではupdateしてもREACTに遷移しない"""
        sm = StateMachine()
        sm._state = GameState.PLAY
        sm._state_start_time = time.time() - 10  # 十分な時間経過
        sm._reachy_hand = Hand.ROCK
        sm._user_hand = None  # ユーザーの手は未検出

        changed = sm.update()

        assert changed is False
        assert sm.state == GameState.PLAY

    def test_multiple_hand_detections_uses_latest(self):
        """最小表示時間中に複数回検出された場合、最新の手を使う"""
        sm = StateMachine()
        sm._state = GameState.PLAY
        sm._state_start_time = time.time()  # 今入ったばかり
        sm._reachy_hand = Hand.ROCK

        # 最初の検出: パー
        sm.on_user_hand_detected(Hand.PAPER)
        assert sm.user_hand == Hand.PAPER

        # 2回目の検出: チョキ
        sm.on_user_hand_detected(Hand.SCISSORS)
        assert sm.user_hand == Hand.SCISSORS

        # 時間経過
        sm._state_start_time = time.time() - 10

        # updateで遷移（最新のチョキで判定）
        sm.update()

        assert sm.state == GameState.REACT
        # Rock vs Scissors = Reachy WIN
        assert sm.game_result == GameResult.WIN