"""HR environment — wraps 4 tool servers with OpenEnv's reset/step/state contract."""

from __future__ import annotations

import json
import logging
import os
from typing import Any
from uuid import uuid4

import requests
from openenv.core.env_server.interfaces import Environment
from openenv.core.env_server.types import State

from simlab_hr.evaluator import evaluate_episode
from simlab_hr.models import HRAction, HRObservation
from simlab_hr.tasks import BUNDLED_TASKS, get_task

logger = logging.getLogger(__name__)

MAX_STEPS_PER_EPISODE = 30

TOOL_SERVER_ENV_MAP = {
    "hrms": "HRMS_TOOL_SERVER_URL",
    "email": "EMAIL_TOOL_SERVER_URL",
    "calendar": "CALENDAR_TOOL_SERVER_URL",
    "rocketchat": "ROCKETCHAT_TOOL_SERVER_URL",
}

TOOL_SERVER_DEFAULTS = {
    "hrms": "http://localhost:8030",
    "email": "http://localhost:8040",
    "calendar": "http://localhost:8050",
    "rocketchat": "http://localhost:8060",
}


class HREnvironment(Environment):
    """OpenEnv environment backed by SimLab's HR tool servers."""

    def __init__(self) -> None:
        self._server_urls: dict[str, str] = {}
        for name, env_var in TOOL_SERVER_ENV_MAP.items():
            self._server_urls[name] = os.environ.get(env_var, TOOL_SERVER_DEFAULTS[name])

        self._state = State(episode_id=str(uuid4()), step_count=0)
        self._current_task = BUNDLED_TASKS[0]
        self._tools: dict[str, list[str]] = {}
        self._episode_count = 0
        self._action_history: list[dict[str, Any]] = []

    def reset(self) -> HRObservation:
        self._current_task = get_task(self._episode_count)
        self._episode_count += 1
        self._state = State(episode_id=str(uuid4()), step_count=0)
        self._tools = self._discover_all_tools()
        self._action_history = []

        return HRObservation(
            result=(
                "HR environment ready. You have access to 4 tool servers: "
                "hrms (employee records, leave, payroll), email (inbox), "
                "calendar (scheduling), and rocketchat (team messaging). "
                "When you've completed the task, call tool_name='submit_task' "
                "on any server to trigger evaluation and get your score."
            ),
            is_error=False,
            tools_available=self._tools,
            task_instruction=self._current_task.instruction,
            done=False,
            reward=0.0,
        )

    def step(self, action: HRAction) -> HRObservation:
        self._state.step_count += 1

        if action.tool_name == "submit_task":
            return self._evaluate_and_finish()

        server_url = self._server_urls.get(action.tool_server)
        if server_url is None:
            result = f"Unknown tool server: '{action.tool_server}'. Use one of: hrms, email, calendar, rocketchat."
            is_error = True
        else:
            result, is_error = self._call_tool(server_url, action)

        self._action_history.append({
            "step": self._state.step_count,
            "server": action.tool_server,
            "tool": action.tool_name,
            "parameters": action.parameters,
            "result": result[:2000],
            "is_error": is_error,
        })

        at_step_limit = self._state.step_count >= MAX_STEPS_PER_EPISODE
        if at_step_limit:
            return self._evaluate_and_finish()

        return HRObservation(
            result=result,
            is_error=is_error,
            tools_available=self._tools,
            task_instruction=self._current_task.instruction,
            done=False,
            reward=0.0,
        )

    @property
    def state(self) -> State:
        return self._state

    def _call_tool(self, server_url: str, action: HRAction) -> tuple[str, bool]:
        """Proxy a tool call to the appropriate server. Returns (result, is_error)."""
        payload = {"action": {"tool_name": action.tool_name, "parameters": action.parameters}}
        try:
            resp = requests.post(
                f"{server_url}/step",
                json=payload,
                headers={"Content-Type": "application/json"},
                timeout=30,
            )
            result = resp.text
            is_error = resp.status_code != 200
            try:
                parsed = resp.json()
                result = json.dumps(parsed, indent=2) if isinstance(parsed, (dict, list)) else str(parsed)
            except (json.JSONDecodeError, ValueError):
                pass
            return result, is_error
        except requests.RequestException as exc:
            return f"Tool invocation failed on {action.tool_server}: {exc}", True

    def _evaluate_and_finish(self) -> HRObservation:
        """Run the rubric judge and return the final observation with reward."""
        eval_result = evaluate_episode(
            task_instruction=self._current_task.instruction,
            rubric=self._current_task.rubric,
            action_history=self._action_history,
        )

        verdict_msg = (
            f"Episode complete. Score: {eval_result.score:.2f} ({eval_result.verdict})"
        )
        if eval_result.evidence:
            verdict_msg += "\nEvidence: " + "; ".join(eval_result.evidence)
        if eval_result.failed_criteria:
            verdict_msg += "\nFailed: " + "; ".join(eval_result.failed_criteria)
        if eval_result.error:
            verdict_msg += f"\nNote: {eval_result.error}"

        return HRObservation(
            result=verdict_msg,
            is_error=False,
            tools_available=self._tools,
            task_instruction=self._current_task.instruction,
            done=True,
            reward=eval_result.score,
        )

    def _discover_all_tools(self) -> dict[str, list[str]]:
        """Fetch available tools from each tool server."""
        all_tools: dict[str, list[str]] = {}
        for name, url in self._server_urls.items():
            all_tools[name] = self._discover_tools(name, url)
        all_tools.setdefault("_meta", []).append("submit_task")
        return all_tools

    def _discover_tools(self, server_name: str, server_url: str) -> list[str]:
        """Fetch tool names from a single server's GET /tools endpoint."""
        try:
            resp = requests.get(f"{server_url}/tools", timeout=15)
            resp.raise_for_status()
            data = resp.json()
            tools = data.get("tools", []) if isinstance(data, dict) else []
            return [t["name"] for t in tools if isinstance(t, dict) and "name" in t]
        except Exception as exc:
            logger.warning("Could not discover tools from %s: %s", server_name, exc)
            return []