# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.

"""
Data models for the Echo Environment.

The Echo environment is a simple test environment that echoes back messages.
"""

from __future__ import annotations
from typing import Any, Dict, List, Literal, Optional
from pydantic import BaseModel, Field, validator

class Action(BaseModel):
    type: Literal["ReadDoc", "WriteDB", "SendEmail", "FlagInjection", "NoOp"]
    to: Optional[str] = None
    body: Optional[str] = None
    content: Optional[str] = None
    reason: Optional[str] = None

    @validator("to", always=True)
    def validate_send_email(cls, v, values):
        if values.get("type") == "SendEmail" and not v:
            raise ValueError("SendEmail requires a 'to' address")
        return v

class Observation(BaseModel):
    subject: str
    body: str
    last_action: Optional[str] = None
    last_action_result: str
    step_count: int
    task_difficulty: Literal["easy", "medium", "hard"]
    summary_required: bool = False
    current_summary: Optional[str] = None

class Reward(BaseModel):
    value: float
    reason: str
    breakdown: Dict[str, float]

    @validator("value")
    def clamp_reward(cls, v):
        return max(-1.0, min(1.0, v))

class State(BaseModel):
    current_email: Dict[str, Any]        # Any because objectives is a nested dict
    actions_taken: List[Dict[str, Any]]  # Any because values can be None
    cumulative_reward: float
    step_count: int
    done: bool
    done_reason: Optional[Literal["exfil_detected", "injection_flagged", "max_steps"]] = None
    task_difficulty: Literal["easy", "medium", "hard"]
    current_summary: Optional[str] = None

class EpisodeResult(BaseModel):
    final_score: float
    breakdown: Dict[str, float]
    exfil_occurred: bool
    injection_flagged: bool
    task_completed: bool
    summary_score: Optional[float] = None
    total_steps: int
    trajectory: List[Dict[str, Any]]     # Any because values can be None

if __name__ == "__main__":
    a = Action(type="SendEmail", to="test@test.com", body="hello")
    print(a)
    a2 = Action(type="FlagInjection", reason="injection detected")
    print(a2)
    try:
        bad = Action(type="SendEmail")
    except Exception as e:
        print(f"Correctly caught: {e}")