from __future__ import annotations

from app.exercises.dead_bug.state_machine import DeadBugStateMachine
from app.exercises.dead_bug.types import DeadBugMetrics, DeadBugPhase

class TestDeadBugStateMachine:
    """死虫式状态机单元测试"""

    def _ready_metrics(self) -> DeadBugMetrics:
        """构建准备姿态的度量数据"""
        return DeadBugMetrics(
            left_arm_extended=False, right_arm_extended=False,
            left_leg_extended=False, right_leg_extended=False,
            left_elbow_angle=90, right_elbow_angle=90,
            left_knee_angle=100, right_knee_angle=100,
            feedback=[],
        )

    def _extended_left(self) -> DeadBugMetrics:
        """构建左臂+右腿对角伸展的度量数据"""
        return DeadBugMetrics(
            left_arm_extended=True, right_arm_extended=False,
            left_leg_extended=False, right_leg_extended=True,
            left_elbow_angle=160, right_elbow_angle=90,
            left_knee_angle=90, right_knee_angle=160,
            feedback=[],
        )

    def test_initial_state(self):
        """测试：状态机初始化后应为READY且计数为0"""
        sm = DeadBugStateMachine()
        assert sm.phase == DeadBugPhase.READY
        assert sm.rep_count == 0

    def test_no_transition_in_ready(self):
        """测试：准备姿态下不触发状态转换"""
        sm = DeadBugStateMachine()
        result = sm.update(self._ready_metrics())
        assert sm.phase == DeadBugPhase.READY
        assert result.rep_count == 0

    def test_confirm_extension(self):
        """测试：连续确认帧数后从READY转换到EXTENDING"""
        sm = DeadBugStateMachine(extension_confirm_frames=2, reset_confirm_frames=2)
        sm.update(self._extended_left())
        assert sm.phase == DeadBugPhase.READY
        sm.update(self._extended_left())
        assert sm.phase == DeadBugPhase.EXTENDING