import json
import logging
import os
import re
import time

from dataclasses import dataclass
from typing import Optional

from pydantic import ValidationError

try:
    from dotenv import load_dotenv
except ImportError:
    def load_dotenv():
        return False

try:
    from openai import OpenAI
except ImportError:
    OpenAI = None

from envs.environment import WorkSpaceEnvironment
from models.schemas import WorkSpaceAction, WorkspaceState
from prompter.system_prompt import SystemPrompt

load_dotenv()

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
)
logger = logging.getLogger(__name__)


SCRIPTED_QUESTIONS = {
    "Finance": (
        "Hi Finance, what budget guardrails should the PRD lock in for the first release? "
        "Please call out the hard budget cap and any scope discipline we should preserve."
    ),
    "Security": (
        "Hi Security, what authentication requirement is non-negotiable for this app? "
        "Please tell me the strongest user-verification control that must appear in the PRD."
    ),
    "UX": (
        "Hi UX, what checkout experience must the PRD guarantee for launch? "
        "Please describe the required conversion flow in plain terms."
    ),
}


def normalize_agent_mode(mode: str | None) -> str:
    canonical = (mode or "").strip().lower()
    aliases = {
        "": "scripted",
        "scripted": "scripted",
        "medium": "medium",
        "mock": "scripted",
        "deterministic": "scripted",
        "llm": "llm",
        "local": "local",
        "trained": "local",
        "live": "llm",
        "online": "llm",
        "remote": "llm",
        "api": "llm",
    }
    if canonical not in aliases:
        raise ValueError(f"Unsupported agent mode: {mode}")
    return aliases[canonical]


@dataclass
class AgentDecision:
    action: Optional[WorkSpaceAction]
    status: str = "ok"
    error: Optional[str] = None
    raw_response: Optional[str] = None


class AgentWrapper:
    def __init__(self, mode: str | None = None):
        requested_mode = mode or os.getenv("BASELINE_AGENT_MODE") or "scripted"
        self.mode = normalize_agent_mode(requested_mode)
        self.model_name = os.getenv("AGENT_MODEL_NAME") or os.getenv("MODEL_NAME") or "llama-3.1-8b-instant"
        self.prompt_builder = SystemPrompt()
        self.client: object | None = None
        self.local_model = None
        self.local_tokenizer = None
        self._torch = None

        if self.mode == "llm":
            if OpenAI is None:
                raise RuntimeError("openai package is required for llm agent mode.")
            self.client = OpenAI(
                base_url=os.getenv("AGENT_API_BASE_URL") or os.getenv("API_BASE_URL_1"),
                api_key=os.getenv("AGENT_API_KEY") or os.getenv("GROQ_API_KEY"),
                timeout=45.0,
                max_retries=2,
            )
        elif self.mode == "local":
            try:
                import torch
                from transformers import AutoModelForCausalLM, AutoTokenizer
            except ImportError as exc:
                raise RuntimeError("transformers and torch are required for local agent mode.") from exc
            model_path = os.getenv("LOCAL_AGENT_MODEL_PATH")
            if not model_path:
                raise RuntimeError("Set LOCAL_AGENT_MODEL_PATH for local agent mode.")
            self._torch = torch
            self.local_tokenizer = AutoTokenizer.from_pretrained(model_path)
            if self.local_tokenizer.pad_token is None:
                self.local_tokenizer.pad_token = self.local_tokenizer.eos_token
            self.local_model = AutoModelForCausalLM.from_pretrained(
                model_path,
                torch_dtype="auto",
                device_map="auto",
            )

        self.reset_episode()

    def reset_episode(self):
        self.scripted_targets = ["Finance", "Security", "UX"]
        self.final_draft = self._build_final_draft()

    def get_action(
        self,
        observation_text: str,
        conversation_history: list[dict[str, str]],
        discovered_constraints: str,
    ) -> AgentDecision:
        if self.mode == "scripted":
            return self._scripted_action(observation_text)
        if self.mode == "local":
            return self._local_action(observation_text, conversation_history, discovered_constraints)
        return self._llm_action(observation_text, conversation_history, discovered_constraints)
    
    def _scripted_action(self, observation_text: str) -> AgentDecision:
        current_turn = self._extract_turn(observation_text)

        # Gather constraints 1-by-1
        if current_turn < len(self.scripted_targets):
            target = self.scripted_targets[current_turn]
            return AgentDecision(
                action=WorkSpaceAction(
                    action_type="message_expert",
                    target=target,
                    content=SCRIPTED_QUESTIONS[target],
                )
            )

        # Propose a draft on Turn 4
        if current_turn == len(self.scripted_targets):
            return AgentDecision(
                action=WorkSpaceAction(
                    action_type="propose_draft",
                    target="All",
                    content=self._build_draft_proposal(),
                )
            )

        if current_turn == len(self.scripted_targets) + 1:
            return AgentDecision(
                action=WorkSpaceAction(
                    action_type="submit_final",
                    target=None,
                    content=self.final_draft,
                )
            )
            
        return AgentDecision(action=None, status="completed")
    

    def _llm_action(
        self,
        observation_text: str,
        conversation_history: list[dict[str, str]],
        discovered_constraints: str,
    ) -> AgentDecision:
        if self.client is None:
            return AgentDecision(
                action=None,
                status="infra_error",
                error="Agent client is not configured for llm mode.",
            )

        system_prompt = self.prompt_builder.system_prompt(
            conversation_history=self._render_history(conversation_history),
            discovered=discovered_constraints,
        )

        try:
            response = self.client.chat.completions.create(
                messages=[
                    {"role": "system", "content": system_prompt},
                    *conversation_history,
                    {"role": "user", "content": observation_text},
                ],
                model=self.model_name,
                temperature=0.2,
                max_tokens=2048,
                response_format={"type": "json_object"}
            )
        except Exception as exc:
            logger.error(f"Agent API Error: {exc}")
            return AgentDecision(action=None, status="infra_error", error=str(exc))

        raw_text = (response.choices[0].message.content or "").strip()
        json_match = re.search(r"\{.*?\}", raw_text, re.DOTALL)
        if not json_match:
            return AgentDecision(
                action=None,
                status="parse_error",
                error="Model response did not contain a JSON object.",
                raw_response=raw_text,
            )

        try:
            payload = json.loads(json_match.group(0))
        except json.JSONDecodeError as exc:
            return AgentDecision(
                action=None,
                status="parse_error",
                error=f"Invalid JSON payload: {exc}",
                raw_response=raw_text,
            )

        try:
            action = WorkSpaceAction(**payload)
        except ValidationError as exc:
            return AgentDecision(
                action=None,
                status="policy_error",
                error=f"Schema validation failed: {exc}",
                raw_response=raw_text,
            )

        semantic_error = self._validate_action(action)
        if semantic_error:
            return AgentDecision(
                action=None,
                status="policy_error",
                error=semantic_error,
                raw_response=raw_text,
            )

        return AgentDecision(action=action, raw_response=raw_text)

    def _local_action(
        self,
        observation_text: str,
        conversation_history: list[dict[str, str]],
        discovered_constraints: str,
    ) -> AgentDecision:
        if self.local_model is None or self.local_tokenizer is None:
            return AgentDecision(
                action=None,
                status="infra_error",
                error="Local model is not configured for local agent mode.",
            )

        system_prompt = self.prompt_builder.system_prompt(
            conversation_history=self._render_history(conversation_history),
            discovered=discovered_constraints,
        )

        messages = [
            {"role": "system", "content": system_prompt},
            *conversation_history,
            {"role": "user", "content": observation_text},
        ]

        try:
            if hasattr(self.local_tokenizer, "apply_chat_template"):
                prompt_text = self.local_tokenizer.apply_chat_template(
                    messages,
                    tokenize=False,
                    add_generation_prompt=True,
                )
            else:
                prompt_text = (
                    f"System: {system_prompt}\n"
                    + "\n".join(f"{m['role']}: {m['content']}" for m in conversation_history)
                    + f"\nuser: {observation_text}\nassistant:"
                )

            inputs = self.local_tokenizer(prompt_text, return_tensors="pt")
            inputs = {k: v.to(self.local_model.device) for k, v in inputs.items()}
            prompt_len = inputs["input_ids"].shape[1]

            with self._torch.no_grad():
                output_ids = self.local_model.generate(
                    **inputs,
                    max_new_tokens=256,
                    do_sample=False,
                    temperature=0.0,
                    pad_token_id=self.local_tokenizer.pad_token_id,
                )

            completion_ids = output_ids[0][prompt_len:]
            raw_text = self.local_tokenizer.decode(completion_ids, skip_special_tokens=True).strip()
        except Exception as exc:
            logger.error(f"Local Agent Error: {exc}")
            return AgentDecision(action=None, status="infra_error", error=str(exc))

        json_match = re.search(r"\{.*?\}", raw_text, re.DOTALL)
        if not json_match:
            return AgentDecision(
                action=None,
                status="parse_error",
                error="Model response did not contain a JSON object.",
                raw_response=raw_text,
            )

        try:
            payload = json.loads(json_match.group(0))
        except json.JSONDecodeError as exc:
            return AgentDecision(
                action=None,
                status="parse_error",
                error=f"Invalid JSON payload: {exc}",
                raw_response=raw_text,
            )

        try:
            action = WorkSpaceAction(**payload)
        except ValidationError as exc:
            return AgentDecision(
                action=None,
                status="policy_error",
                error=f"Schema validation failed: {exc}",
                raw_response=raw_text,
            )

        semantic_error = self._validate_action(action)
        if semantic_error:
            return AgentDecision(
                action=None,
                status="policy_error",
                error=semantic_error,
                raw_response=raw_text,
            )

        return AgentDecision(action=action, raw_response=raw_text)

    def _build_draft_proposal(self) -> str:
        return (
            "Draft PRD proposal for the mobile app MVP:\n"
            "- Keep the initial release budget capped at $50k and prioritize the highest-ROI scope.\n"
            "- Require biometric 2FA for sign-in and sensitive actions.\n"
            "- Deliver a true single-click checkout so the purchase flow stays low-friction."
        )

    def _build_final_draft(self) -> str:
        return (
            "Mobile App PRD Final Draft\n"
            "1. Budget and scope: The first release must stay at or below a $50k budget cap, with the MVP limited to the highest-ROI features.\n"
            "2. Security: The app must require biometric 2FA for login and other sensitive account actions.\n"
            "3. UX: Checkout must be implemented as a single-click checkout flow with minimal friction for the user.\n"
            "4. Delivery focus: Product, design, and engineering should keep the implementation lean so these launch requirements are met without scope creep."
        )

    def _validate_action(self, action: WorkSpaceAction) -> Optional[str]:
        if not action.content.strip():
            return "Action content cannot be empty."

        if action.action_type == "message_expert" and action.target is None:
            return "message_expert actions must include a target expert."
        if action.action_type == "message_expert" and action.target == "All":
            return "message_expert must target exactly one expert; do not use target='All'."
        if action.action_type == "propose_draft" and action.target != "All":
            return "propose_draft actions must use target='All' to collect multi-expert draft feedback."

        if action.action_type == "submit_final" and action.target is not None:
            return "submit_final actions must use target=null."

        return None

    def _render_history(self, conversation_history: list[dict[str, str]], max_items: int = 8) -> str:
        if not conversation_history:
            return "No prior conversation yet."

        rendered = []
        for message in conversation_history[-max_items:]:
            content = message["content"].replace("\n", " ").strip()
            rendered.append(f"{message['role']}: {content}")
        return "\n".join(rendered)

    def _extract_turn(self, observation_text: str) -> int:
        match = re.search(r"Turn\s+(\d+)", observation_text)
        return int(match.group(1)) if match else 0

    def get_discovered_constraints(self, state: WorkspaceState) -> str:
        lines = []
        for name, expert in state.experts.items():
            if expert.constraint_discovered_by_agent:
                lines.append(f"{name}: discovered from prior expert feedback.")
            else:
                lines.append(f"{name}: still unknown.")
        return "\n".join(lines)


def summarize_results(results: list[dict], episodes_requested: int, agent_mode: str, env_mode: str) -> dict:
    status_counts: dict[str, int] = {}
    for result in results:
        status_counts[result["status"]] = status_counts.get(result["status"], 0) + 1

    completed = [result for result in results if result["status"] == "completed"]

    avg_cumulative = None
    avg_final = None
    avg_turns = None
    all_constraints_discovered_rate = None
    finance_discovery_rate = None
    security_discovery_rate = None
    ux_discovery_rate = None

    if completed:
        avg_cumulative = round(
            sum(result["cumulative_reward"] for result in completed) / len(completed),
            3,
        )
        avg_final = round(
            sum(result["final_step_reward"] for result in completed) / len(completed),
            3,
        )
        avg_turns = round(
            sum(result["turns_completed"] for result in completed) / len(completed),
            2,
        )

        def has_discovery(result: dict, expert_name: str) -> bool:
            marker = f"{expert_name}: discovered from prior expert feedback."
            return marker in (result.get("discovered_constraints") or "")

        finance_hits = sum(1 for result in completed if has_discovery(result, "Finance"))
        security_hits = sum(1 for result in completed if has_discovery(result, "Security"))
        ux_hits = sum(1 for result in completed if has_discovery(result, "UX"))
        all_constraints_hits = sum(
            1
            for result in completed
            if has_discovery(result, "Finance")
            and has_discovery(result, "Security")
            and has_discovery(result, "UX")
        )

        finance_discovery_rate = round(finance_hits / len(completed), 3)
        security_discovery_rate = round(security_hits / len(completed), 3)
        ux_discovery_rate = round(ux_hits / len(completed), 3)
        all_constraints_discovered_rate = round(all_constraints_hits / len(completed), 3)

    return {
        "episodes_requested": episodes_requested,
        "episodes_completed": len(completed),
        "completion_rate": round(len(completed) / episodes_requested, 3) if episodes_requested else 0.0,
        "average_cumulative_reward_completed": avg_cumulative,
        "average_final_step_reward_completed": avg_final,
        "average_turns_completed": avg_turns,
        "all_constraints_discovered_rate": all_constraints_discovered_rate,
        "finance_discovery_rate": finance_discovery_rate,
        "security_discovery_rate": security_discovery_rate,
        "ux_discovery_rate": ux_discovery_rate,
        "status_counts": status_counts,
        "agent_mode": agent_mode,
        "environment_mode": env_mode,
    }


def record_baseline(episodes: Optional[int] = None):
    episodes = episodes or int(os.getenv("BASELINE_EPISODES", "10"))
    step_delay = float(os.getenv("BASELINE_STEP_DELAY", "0"))

    agent_mode = os.getenv("BASELINE_AGENT_MODE") or "scripted"
    env_mode = os.getenv("BASELINE_ENV_MODE") or "mock"

    env = WorkSpaceEnvironment(mode=env_mode)
    agent = AgentWrapper(mode=agent_mode)
    all_results = []

    print(
        f"Starting Baseline Recording for {episodes} episodes "
        f"(agent_mode={agent.mode}, env_mode={env.mode})..."
    )

    for i in range(episodes):
        obs = env.reset()
        agent.reset_episode()
        conversation_history: list[dict[str, str]] = []
        cumulative_reward = 0.0
        step_rewards: list[float] = []
        episode_result: Optional[dict] = None

        print(f"\n--- Episode {i + 1} ---")

        while not obs.done:
            prompt = f"Turn {obs.current_turn}. Feedback: {obs.feedback}"
            discovered = agent.get_discovered_constraints(env.state())

            decision = agent.get_action(prompt, conversation_history, discovered)
            
            if obs.current_turn >= 4:
                prompt += "\n\nCRITICAL SYSTEM OVERRIDE: You are out of time. You MUST output a JSON with action_type: 'submit_final' right now. Do not message anyone else."
                

            if decision.status != "ok" or decision.action is None:
                episode_result = {
                    "episode": i + 1,
                    "status": decision.status,
                    "error_source": "agent",
                    "error_detail": decision.error,
                    "raw_response": decision.raw_response,
                    "final_step_reward": step_rewards[-1] if step_rewards else None,
                    "cumulative_reward": round(cumulative_reward, 3),
                    "step_rewards": step_rewards,
                    "turns_completed": obs.current_turn,
                    "discovered_constraints": discovered,
                    "chat_history": env.state().chat_history,
                }
                print(f"  {decision.status.upper()}: Episode {i + 1} ended early")
                break

            action = decision.action
            print(f"Agent Action: {action.action_type} -> {action.target}")

            conversation_history.append({"role": "user", "content": prompt})
            conversation_history.append({"role": "assistant", "content": action.model_dump_json()})

            try:
                obs = env.step(action)
            except Exception as exc:
                logger.error(f"Environment step failed: {exc}")
                episode_result = {
                    "episode": i + 1,
                    "status": "infra_error",
                    "error_source": "environment",
                    "error_detail": str(exc),
                    "raw_response": None,
                    "final_step_reward": step_rewards[-1] if step_rewards else None,
                    "cumulative_reward": round(cumulative_reward, 3),
                    "step_rewards": step_rewards,
                    "turns_completed": env.state().turn_count,
                    "discovered_constraints": agent.get_discovered_constraints(env.state()),
                    "chat_history": env.state().chat_history,
                }
                print(f"  INFRA_ERROR: Environment failed during episode {i + 1}")
                break

            cumulative_reward = round(cumulative_reward + obs.reward, 3)
            step_rewards.append(obs.reward)

            if step_delay > 0:
                time.sleep(step_delay)

        if episode_result is None:
            episode_result = {
                "episode": i + 1,
                "status": "completed",
                "error_source": None,
                "error_detail": None,
                "raw_response": None,
                "final_step_reward": obs.reward,
                "cumulative_reward": cumulative_reward,
                "step_rewards": step_rewards,
                "turns_completed": obs.current_turn,
                "discovered_constraints": agent.get_discovered_constraints(env.state()),
                "chat_history": env.state().chat_history,
            }
            print(
                f"Episode {i + 1} completed in {obs.current_turn} turns. "
                f"Final step reward: {obs.reward:.3f} | Cumulative reward: {cumulative_reward:.3f}"
            )
        else:
            print(f"Episode {i + 1} status: {episode_result['status']}")

        all_results.append(episode_result)

    summary = summarize_results(all_results, episodes, agent.mode, env.mode)
    output_payload = {
        "summary": summary,
        "episodes": all_results,
    }

    with open("baseline_results.json", "w", encoding="utf-8") as file:
        json.dump(output_payload, file, indent=4)

    print("\nBaseline summary:")
    print(json.dumps(summary, indent=4))
    print("Saved to baseline_results.json.")


if __name__ == "__main__":
    record_baseline()