"""
Inference Script for Cloud-Native Debug Environment
===================================
MANDATORY
- Before submitting, ensure the following variables are defined in your environment configuration:
    API_BASE_URL   The API endpoint for the LLM.
    MODEL_NAME     The model identifier to use for inference.
    HF_TOKEN       Your Hugging Face / API key.
    LOCAL_IMAGE_NAME The name of the local image to use for the environment if you are using from_docker_image()
                     method

- Defaults are set only for API_BASE_URL and MODEL_NAME
    (and should reflect your active inference setup):
    API_BASE_URL = os.getenv("API_BASE_URL", "<your-active-endpoint>")
    MODEL_NAME = os.getenv("MODEL_NAME", "<your-active-model>")

- The inference script must be named `inference.py` and placed in the root directory of the project
- Participants must use OpenAI Client for all LLM calls using above variables

STDOUT FORMAT
- The script must emit exactly three line types to stdout, in this order:

    [START] task=<task_name> env=<benchmark> model=<model_name>
    [STEP]  step=<n> action=<action_str> reward=<0.00> done=<true|false> error=<msg|null>
    [END]   success=<true|false> steps=<n> score=<score> rewards=<r1,r2,...,rn>

  Rules:
    - One [START] line at episode begin.
    - One [STEP] line per step, immediately after env.step() returns.
    - One [END] line after the episode completes, always emitted (even on exception).
    - reward and rewards are formatted to 2 decimal places.
    - done and success are lowercase booleans: true or false.
    - error is the raw error string, or null if none.
    - All fields on a single line with no newlines within a line.
    - Each tasks should return score in [0, 1]

  Example:
    [START] task=dockerfile_syntax env=cloud_native_devops model=meta-llama/Llama-3.1-70B-Instruct
    [STEP] step=1 action=edit_file reward=0.30 done=false error=null
    [STEP] step=2 action=submit reward=0.00 done=true error=null
    [END] success=true steps=2 score=0.850 rewards=0.30,0.00
"""


import json
import os
import re
import sys
import time
from typing import Any, Dict, List, Optional

import requests
from openai import OpenAI


API_BASE_URL = os.getenv("API_BASE_URL") or "https://router.huggingface.co/v1"
MODEL_NAME = os.getenv("MODEL_NAME") or "meta-llama/Llama-3.1-70B-Instruct"
API_KEY = os.getenv("HF_TOKEN") or os.getenv("API_KEY")
ENV_URL = os.getenv("ENV_URL", "http://localhost:7860")
LOCAL_IMAGE_NAME = os.getenv("LOCAL_IMAGE_NAME")
BENCHMARK = "cloud_native_devops"
MAX_STEPS = 8  # leave 2 steps buffer before env hard-limit of 10
SUCCESS_SCORE_THRESHOLD = 0.1  # normalized score in [0, 1]

SYSTEM_PROMPT = """You are an expert DevOps engineer debugging cloud-native deployment pipelines.
You will receive broken Dockerfile, GitHub Actions workflow, and/or Kubernetes manifest files along with error messages.

Your job is to:
1. Analyze the error message carefully
2. Identify the root cause in the configuration files
3. Provide a precise fix

When you identify a fix, respond with a JSON object in this exact format:
{
  "action_type": "YOUR_CHOSEN_ACTION_TYPE",
  "reasoning": "Brief explanation of the bug and fix",
  "edits": [
    {
      "file_path": "path/to/file",
      "line_number": 5,               // Only needed for replace_line, add_line, delete_line, add_block
      "old_content": "exactly broken", // Only needed for edit_file, delete_block
      "new_content": "corrected block" // Not needed for delete_line, delete_block
    }
  ]
}

Available action_type values for edits:
- "edit_file" (requires old_content and new_content)
- "replace_line" (requires line_number and new_content)
- "add_line" (requires line_number and new_content)
- "delete_line" (requires line_number)
- "add_block" (requires line_number and new_content)
- "delete_block" (requires old_content)

To create a new file (e.g. a missing ConfigMap), use "edit_file" with empty old_content:
{
  "action_type": "edit_file",
  "reasoning": "Create missing ConfigMap manifest",
  "edits": [
    {
      "file_path": "k8s/configmap.yaml",
      "old_content": "",
      "new_content": "apiVersion: v1\\nkind: ConfigMap\\n..."
    }
  ]
}

If you believe all issues are fixed and want to submit, respond with:
{"action_type": "submit"}

If you need a hint, respond with:
{"action_type": "request_hint"}

Rules:
- Match old_content EXACTLY as it appears in the file (whitespace matters)
- Fix one issue at a time for precision
- Focus on the error message — it tells you exactly what's wrong
- Common issues: typos, wrong syntax, missing fields, wrong secret references
- For GitHub Actions: check secret syntax (${{ }} not ${ }), env blocks, permissions
- For Dockerfiles: check instruction syntax, file paths, base image tags
- For Kubernetes: check label selectors, port matching, resource limits, probe configs, ingress rules
- For full-stack pipelines: issues may span multiple files (workflow + Dockerfile + K8s manifests)
- Always respond with valid JSON only, no markdown fences"""


# ---------------------------------------------------------------------------
# Logging helpers (mandatory stdout format)
# ---------------------------------------------------------------------------

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


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


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


# ---------------------------------------------------------------------------
# Client / env helpers
# ---------------------------------------------------------------------------

def create_client() -> OpenAI:
    """Create OpenAI-compatible client for HuggingFace router."""
    return OpenAI(
        base_url=API_BASE_URL,
        api_key=API_KEY,
    )


def env_request(method: str, endpoint: str, json_data: Optional[Dict] = None) -> Dict[str, Any]:
    """Make a request to the environment server."""
    url = f"{ENV_URL}{endpoint}"
    if method == "GET":
        resp = requests.get(url, timeout=30)
    else:
        resp = requests.post(url, json=json_data or {}, timeout=30)
    resp.raise_for_status()
    return resp.json()


def format_observation(obs: Dict[str, Any]) -> str:
    """Format observation into a prompt for the LLM."""
    parts = []
    parts.append(f"Task: {obs.get('task_description', 'Unknown')}")
    parts.append(f"Difficulty: {obs.get('difficulty', 'unknown')}")
    parts.append(f"Step: {obs.get('step_number', 0)}/{obs.get('max_steps', 10)}")
    parts.append(f"Issues fixed: {obs.get('issues_fixed', 0)}/{obs.get('total_issues', '?')}")

    error = obs.get("error", {})
    parts.append(f"\n--- ERROR ---")
    parts.append(f"Phase: {error.get('phase', 'unknown')}")
    parts.append(f"Message: {error.get('error_message', 'No error')}")
    if error.get("failed_step"):
        parts.append(f"Failed step: {error['failed_step']}")
    if error.get("line_hint"):
        parts.append(f"Line hint: {error['line_hint']}")

    parts.append(f"\n--- FILES ---")
    for f in obs.get("files", []):
        parts.append(f"\n=== {f['path']} ({f.get('file_type', 'unknown')}) ===")
        content = f.get("content", "")
        lines = content.split("\n")
        for i, line in enumerate(lines, 1):
            parts.append(f"{i:3d} | {line}")

    if obs.get("available_secrets"):
        parts.append(f"\n--- AVAILABLE SECRETS ---")
        parts.append(", ".join(obs["available_secrets"]))

    if obs.get("last_action_feedback"):
        parts.append(f"\n--- LAST ACTION FEEDBACK ---")
        parts.append(obs["last_action_feedback"])

    return "\n".join(parts)


def parse_llm_response(text: str) -> Dict[str, Any]:
    """Parse LLM response into an action dict."""
    text = text.strip()

    # Strip markdown code fences if present
    if text.startswith("```"):
        lines = text.split("\n")
        lines = [l for l in lines if not l.strip().startswith("```")]
        text = "\n".join(lines).strip()

    # Try to find JSON in the response
    json_match = re.search(r'\{[\s\S]*\}', text)
    if json_match:
        try:
            return json.loads(json_match.group())
        except json.JSONDecodeError:
            pass

    # Fallback: treat as submit
    return {"action": "submit"}


def build_action(parsed: Dict[str, Any]) -> Dict[str, Any]:
    """Convert parsed LLM response to environment action format."""
    action_type = parsed.get("action_type")

    # Backwards compatibility and standard aliases
    if parsed.get("action") == "submit" or action_type == "submit":
        return {"action_type": "submit"}
    if parsed.get("action") == "hint" or action_type == "request_hint":
        return {"action_type": "request_hint"}

    edits = parsed.get("edits", [])
    if not edits and not action_type:
        return {"action_type": "submit"}

    action_str = action_type if action_type else "edit_file"

    return {
        "action_type": action_str,
        "edits": [
            {
                "file_path": e.get("file_path", ""),
                "line_number": e.get("line_number"),
                "old_content": e.get("old_content", ""),
                "new_content": e.get("new_content", ""),
            }
            for e in edits
        ],
    }


def run_episode(client: OpenAI, task_id: Optional[str] = None, scenario_id: Optional[str] = None) -> Dict[str, Any]:
    """Run a single episode: reset, loop (observe -> LLM -> act), grade."""
    reset_payload: Dict[str, Any] = {}
    if task_id:
        reset_payload["task_id"] = task_id
    if scenario_id:
        reset_payload["scenario_id"] = scenario_id

    # Best-effort task name for Start
    target_task = task_id or "random_task"
    log_start(task=target_task, env=BENCHMARK, model=MODEL_NAME)

    trajectory = []
    rewards: List[float] = []
    steps_taken = 0
    score = 0.0
    success = False

    try:
        reset_resp = env_request("POST", "/reset", reset_payload)
        obs = reset_resp["observation"]
        info = reset_resp.get("info", {})

        actual_task_id = info.get("task_id", target_task)
        actual_scenario_id = info.get("scenario_id", scenario_id or "unknown")

        messages = [{"role": "system", "content": SYSTEM_PROMPT}]
        for step_num in range(1, MAX_STEPS + 1):
            user_msg = format_observation(obs)
            messages.append({"role": "user", "content": user_msg})

            error_msg: Optional[str] = None

            try:
                completion = client.chat.completions.create(
                    model=MODEL_NAME,
                    messages=messages,
                    temperature=0.1,
                    max_tokens=1024,
                )
                llm_text = completion.choices[0].message.content or '{"action": "submit"}'
            except Exception as e:
                error_msg = str(e)
                print(f"[DEBUG] Model request failed: {e}", flush=True)
                llm_text = '{"action": "submit"}'

            messages.append({"role": "assistant", "content": llm_text})

            parsed = parse_llm_response(llm_text)
            action = build_action(parsed)

            step_resp = env_request("POST", "/step", {"action": action})
            obs = step_resp["observation"]
            reward = step_resp.get("reward", 0.0)
            done = step_resp.get("done", False)
            step_info = step_resp.get("info", {})
            steps_taken = step_num

            rewards.append(reward)

            log_step(
                step=step_num,
                action=action["action_type"],
                reward=reward,
                done=done,
                error=error_msg,
            )

            trajectory.append({
                "step": step_num,
                "action": action,
                "reward": reward,
                "done": done,
                "info": step_info,
            })

            if done:
                break

        # Grade the trajectory
        grade_resp = env_request("POST", "/grader", {
            "task_id": actual_task_id,
            "trajectory": trajectory,
        })
        result = grade_resp.get("result", {})
        score = result.get("score", 0.0)
        score = min(max(score, 0.0), 1.0)  # clamp to [0, 1]
        success = score >= SUCCESS_SCORE_THRESHOLD

    finally:
        log_end(success=success, steps=steps_taken, score=score, rewards=rewards)

    return {"score": score, "success": success, "steps": steps_taken, "rewards": rewards}


def run_all_tasks(client: OpenAI) -> Dict[str, float]:
    """Run baseline on all tasks (and ALL their scenarios) and report scores."""
    try:
        from server.tasks.task_registry import TASK_REGISTRY
    except ImportError as e:
        print(f"[DEBUG] Could not import TASK_REGISTRY: {e}", flush=True)
        return {}

    scores: Dict[str, List[float]] = {}

    for task_id, task_cls in TASK_REGISTRY.items():
        task_scores = []
        
        # Iterate over all exact scenarios for this task
        scenarios = task_cls.SCENARIOS
        for scenario in scenarios:
            scenario_id = scenario["id"]
            result = run_episode(client, task_id=task_id, scenario_id=scenario_id)
            task_scores.append(result.get("score", 0.0))
            
        scores[task_id] = task_scores

    # Summary
    print(f"\n[DEBUG] {'='*60}", flush=True)
    print("[DEBUG] BASELINE RESULTS SUMMARY", flush=True)
    print(f"[DEBUG] {'='*60}", flush=True)
    avg_scores = {}
    for task_id, task_scores in scores.items():
        avg = sum(task_scores) / len(task_scores) if task_scores else 0.0
        avg_scores[task_id] = avg
        print(f"[DEBUG]   {task_id:40s} {avg:.3f}", flush=True)

    overall = sum(avg_scores.values()) / len(avg_scores) if avg_scores else 0.0
    print(f"[DEBUG]   {'OVERALL':40s} {overall:.3f}", flush=True)

    return avg_scores


def main():
    """Entry point for baseline inference."""
    if not API_KEY:
        print("[DEBUG] WARNING: HF_TOKEN not set. Set it via: export HF_TOKEN=your_token_here", flush=True)
        print("[DEBUG] Continuing anyway (will fail if auth is required)...", flush=True)

    # Verify environment is running
    try:
        health = env_request("GET", "/health")
        print(f"[DEBUG] Environment status: {health.get('status', 'unknown')}", flush=True)
    except Exception as e:
        print(f"[DEBUG] Cannot connect to environment at {ENV_URL}: {e}", flush=True)
        print("[DEBUG] Start the server first: python -m uvicorn server.app:app --host 0.0.0.0 --port 7860", flush=True)
        sys.exit(1)

    client = create_client()

    # If a specific task is requested via CLI arg
    if len(sys.argv) > 1:
        task_id = sys.argv[1]
        scenario_id = sys.argv[2] if len(sys.argv) > 2 else None
        run_episode(client, task_id=task_id, scenario_id=scenario_id)
    else:
        run_all_tasks(client)


if __name__ == "__main__":
    main()