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backend/agent4/sessions.py

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+from __future__ import annotations
+
+from .grader import FeatureGrader
+from .lesson import build_lesson_steps
+from .models import LearningSession, SessionMode, SkillStep, StandardAnswer, StepCompareResult
+
+
+class SessionStore:
+    def __init__(self) -> None:
+        self._items: dict[str, LearningSession] = {}
+
+    def start(self, mode: SessionMode, standard: StandardAnswer) -> LearningSession:
+        session = LearningSession(
+            mode=mode,
+            standard_id=standard.standard_id,
+            title=standard.title,
+            lesson_steps=build_lesson_steps(standard),
+        )
+        self._items[session.session_id] = session
+        return session
+
+    def require(self, session_id: str) -> LearningSession:
+        if session_id not in self._items:
+            raise KeyError(f"session not found: {session_id}")
+        return self._items[session_id]
+
+
+class LearningService:
+    def __init__(self, store: SessionStore, grader: FeatureGrader) -> None:
+        self.store = store
+        self.grader = grader
+
+    def submit_teaching_observation(self, session_id: str, observed: list[SkillStep]) -> StepCompareResult:
+        session = self.store.require(session_id)
+        session.observed_steps.extend(observed)
+        expected = session.lesson_steps[session.current_step_index] if session.current_step_index < len(session.lesson_steps) else None
+        if expected is None:
+            session.status = "completed"
+            result = StepCompareResult(ok=True, score=100, feedback_text="教学步骤已经完成。")
+            session.reports.append(result)
+            return result
+        actual = observed[-1] if observed else None
+        result = self.grader.compare_step(expected, actual)
+        session.reports.append(result)
+        if result.ok:
+            session.current_step_index += 1
+            if session.current_step_index >= len(session.lesson_steps):
+                session.status = "completed"
+        return result
+
+    def submit_test(self, session_id: str, observed: list[SkillStep]):
+        session = self.store.require(session_id)
+        session.observed_steps = observed
+        report = self.grader.grade_sequence(session.lesson_steps, observed)
+        session.final_report = report
+        session.status = "completed"
+        return report
+