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from pydantic import BaseModel, Field
from typing import Optional
from enum import Enum


class Difficulty(str, Enum):
    easy = "easy"
    medium = "medium"
    hard = "hard"


class DebugAction(BaseModel):
    """Agent submits fixed code."""
    code: str = Field(..., description="The corrected Python code")


class TestResult(BaseModel):
    """Result of a single test case execution."""
    test_name: str
    passed: bool
    expected: str = ""
    actual: str = ""
    error: str = ""


class DebugObservation(BaseModel):
    """What the agent sees after reset or step."""
    task_id: str
    difficulty: Difficulty
    description: str
    buggy_code: str
    test_descriptions: list[str]
    test_results: list[TestResult] = Field(default_factory=list)
    stdout: str = ""
    stderr: str = ""
    step_count: int = 0
    max_steps: int = 5
    reward: float = 0.0
    done: bool = False
    total_tests: int = 0
    tests_passed: int = 0


class DebugState(BaseModel):
    """Episode metadata exposed via /state."""
    episode_id: str
    task_id: str
    difficulty: Difficulty
    step_count: int = 0
    max_steps: int = 5
    last_reward: float = 0.0
    cumulative_reward: float = 0.0
    tests_passed: int = 0
    total_tests: int = 0
    done: bool = False


# --- API request / response models ---

class ResetRequest(BaseModel):
    task_id: Optional[str] = None
    seed: Optional[int] = None


class ResetResponse(BaseModel):
    episode_id: str
    observation: DebugObservation


class StepRequest(BaseModel):
    action: DebugAction


class StepResponse(BaseModel):
    observation: DebugObservation
    reward: float
    done: bool
    info: dict = Field(default_factory=dict)