"""Baseline inference script for the SupportDesk OpenEnv submission."""

from __future__ import annotations

import asyncio
import json
import os
import re
from dataclasses import dataclass
from typing import Any

try:
    from openai import OpenAI
except ImportError:  # pragma: no cover - local fallback mode
    OpenAI = None  # type: ignore[assignment]

from client import SupportDeskEnv
from graders import grade_case
from models import SupportDeskAction, SupportDeskObservation
from policies import heuristic_action
from server.supportdesk_environment import SupportDeskEnvironment
from tasks import get_task, list_task_ids

API_BASE_URL = os.getenv("API_BASE_URL", "https://router.huggingface.co/v1")
MODEL_NAME = os.getenv("MODEL_NAME") or "Qwen/Qwen2.5-72B-Instruct"
HF_TOKEN = os.getenv("HF_TOKEN")
API_KEY = HF_TOKEN or os.getenv("API_KEY")
LOCAL_IMAGE_NAME = os.getenv("LOCAL_IMAGE_NAME")
TASK_NAME = os.getenv("SUPPORTDESK_TASK_ID", "billing_refund_easy")
BENCHMARK = os.getenv("SUPPORTDESK_BENCHMARK", "supportdesk_env")
MAX_STEPS = int(os.getenv("MAX_STEPS", "8"))
TEMPERATURE = float(os.getenv("TEMPERATURE", "0"))
MAX_TOKENS = int(os.getenv("MAX_TOKENS", "300"))
SUCCESS_SCORE_THRESHOLD = float(os.getenv("SUCCESS_SCORE_THRESHOLD", "0.1"))
SUBMISSION_SCORE_MIN = 0.01
SUBMISSION_SCORE_MAX = 0.99

SYSTEM_PROMPT = """You are a support operations agent solving one triage ticket.
Return exactly one JSON object with this schema:
{
  "operation": "classify|request_info|draft_reply|add_internal_note|submit|wait",
  "queue": string or null,
  "priority": string or null,
  "issue_type": string or null,
  "status": string or null,
  "resolution_code": string or null,
  "requested_fields": [string],
  "reply": string or null,
  "internal_note": string or null
}

Use the policy snippets in the observation. Keep customer replies short, precise, and professional.
"""


@dataclass
class EpisodeResult:
    """Compact result used for final success logging."""

    final_score: float
    steps_taken: int
    rewards: list[float]


def _build_client() -> OpenAI | None:
    if OpenAI is None or not API_KEY:
        return None
    return OpenAI(base_url=API_BASE_URL, api_key=API_KEY)


def _extract_json(text: str) -> dict[str, Any]:
    try:
        return json.loads(text)
    except json.JSONDecodeError:
        match = re.search(r"\{.*\}", text, flags=re.DOTALL)
        if not match:
            raise
        return json.loads(match.group(0))


def _observation_prompt(observation: SupportDeskObservation) -> str:
    kb_lines = "\n".join(
        f"- {snippet.article_id}: {snippet.title}: {snippet.content}"
        for snippet in observation.knowledge_base
    )
    history_lines = "\n".join(
        f"- step {entry.step}: {entry.summary} ({entry.reward_delta:+.2f})"
        for entry in observation.action_history
    ) or "- none"

    return f"""Task: {observation.task_id} ({observation.difficulty})
Objective: {observation.objective}
Ticket subject: {observation.ticket.subject}
Ticket body: {observation.ticket.body}
Customer tier: {observation.ticket.customer_tier}
Region: {observation.ticket.region}
Affected users: {observation.ticket.affected_users}
SLA minutes remaining: {observation.current_sla_minutes_remaining}
Business impact: {observation.ticket.business_impact}
Secondary concerns: {observation.ticket.secondary_concerns}

Knowledge base:
{kb_lines}

Current case state:
- queue: {observation.case.queue}
- priority: {observation.case.priority}
- issue_type: {observation.case.issue_type}
- status: {observation.case.status}
- resolution_code: {observation.case.resolution_code}
- requested_fields: {observation.case.requested_fields}
- reply: {observation.case.reply}
- internal_note: {observation.case.internal_note}
- customer_follow_up: {observation.case.customer_follow_up.status}

Workflow stage: {observation.workflow_stage}
Required next actions: {observation.required_next_actions}
Risk flags: {observation.risk_flags}
Feedback: {observation.feedback}
Remaining steps: {observation.remaining_steps}

History:
{history_lines}
"""


def _model_action(client: OpenAI | None, observation: SupportDeskObservation) -> SupportDeskAction:
    if client is None:
        return heuristic_action(observation)

    try:
        completion = client.chat.completions.create(
            model=MODEL_NAME,
            temperature=TEMPERATURE,
            max_tokens=MAX_TOKENS,
            messages=[
                {"role": "system", "content": SYSTEM_PROMPT},
                {"role": "user", "content": _observation_prompt(observation)},
            ],
        )
        content = completion.choices[0].message.content or ""
        payload = _extract_json(content)
        return SupportDeskAction(**payload)
    except Exception:
        return heuristic_action(observation)


def _action_to_log_string(action: SupportDeskAction) -> str:
    if hasattr(action, "model_dump_json"):
        payload = action.model_dump(
            exclude_none=True,
            exclude_defaults=True,
            exclude={"metadata"},
        )
    else:
        payload = action.dict(
            exclude_none=True,
            exclude_defaults=True,
        )
        payload.pop("metadata", None)
    return json.dumps(payload, separators=(",", ":"))


def _log_start(task: str) -> None:
    print(f"[START] task={task} env={BENCHMARK} model={MODEL_NAME}", flush=True)


def _log_step(step: int, action_str: str, reward: float, done: bool, error: str | None) -> None:
    error_value = error if error else "null"
    print(
        f"[STEP] step={step} action={action_str} reward={reward:.2f} "
        f"done={str(done).lower()} error={error_value}",
        flush=True,
    )


def _log_end(success: bool, steps: int, score: float, rewards: list[float]) -> None:
    reward_text = ",".join(f"{reward:.2f}" for reward in rewards)
    print(
        f"[END] success={str(success).lower()} steps={steps} "
        f"score={score:.3f} rewards={reward_text}",
        flush=True,
    )


def _submission_score(score: float) -> float:
    return max(SUBMISSION_SCORE_MIN, min(SUBMISSION_SCORE_MAX, score))


def _run_local_episode(task_id: str, client: OpenAI | None) -> EpisodeResult:
    env = SupportDeskEnvironment(task_id=task_id)
    observation = env.reset()
    rewards: list[float] = []
    steps_taken = 0

    try:
        for step in range(1, MAX_STEPS + 1):
            if observation.done:
                break

            action = _model_action(client, observation)
            action_str = _action_to_log_string(action)

            try:
                observation = env.step(action)
                reward = observation.reward or 0.0
                done = observation.done
                error = None
            except Exception as exc:
                raise RuntimeError(str(exc)) from exc

            _log_step(step, action_str, reward, done, error)
            rewards.append(reward)
            steps_taken = step

            if done:
                break

        final_grade = grade_case(get_task(task_id), env.state.case)
        return EpisodeResult(
            final_score=final_grade.total_score,
            steps_taken=steps_taken,
            rewards=rewards,
        )
    finally:
        env.close()


async def _run_docker_episode(task_id: str, client: OpenAI | None) -> EpisodeResult:
    env = await SupportDeskEnv.from_docker_image(
        LOCAL_IMAGE_NAME,
        env_vars={"SUPPORTDESK_TASK_ID": task_id},
    )
    rewards: list[float] = []
    steps_taken = 0

    try:
        result = await env.reset()
        observation = result.observation

        for step in range(1, MAX_STEPS + 1):
            if result.done:
                break

            action = _model_action(client, observation)
            action_str = _action_to_log_string(action)

            try:
                result = await env.step(action)
                observation = result.observation
                reward = result.reward or 0.0
                done = result.done
                error = None
            except Exception as exc:
                raise RuntimeError(str(exc)) from exc

            _log_step(step, action_str, reward, done, error)
            rewards.append(reward)
            steps_taken = step

            if done:
                break

        state = await env.state()
        final_grade = grade_case(get_task(task_id), state.case)
        return EpisodeResult(
            final_score=final_grade.total_score,
            steps_taken=steps_taken,
            rewards=rewards,
        )
    finally:
        await env.close()


async def main() -> None:
    client = _build_client()
    success = False
    final_score = 0.0
    steps_taken = 0
    rewards: list[float] = []

    _log_start(TASK_NAME)

    try:
        if LOCAL_IMAGE_NAME:
            episode = await _run_docker_episode(TASK_NAME, client)
        else:
            episode = _run_local_episode(TASK_NAME, client)
        final_score = _submission_score(episode.final_score)
        success = final_score >= SUCCESS_SCORE_THRESHOLD
        steps_taken = episode.steps_taken
        rewards = episode.rewards
    finally:
        _log_end(success=success, steps=steps_taken, score=final_score, rewards=rewards)


if __name__ == "__main__":
    asyncio.run(main())