import os
import json
import uuid
import httpx
import asyncio
from datetime import datetime, timezone
from flask import Flask, request, jsonify
from flask_jwt_extended import (
    JWTManager,
    create_access_token,
    jwt_required,
    get_jwt_identity,
)
import secrets
from flask_cors import CORS
from dotenv import load_dotenv

# Import the Microsoft Agent Framework A2A classes
from a2a.client import A2ACardResolver
from agent_framework.a2a import A2AAgent

import subprocess, sys, os, logging
from apscheduler.schedulers.background import BackgroundScheduler
from apscheduler.triggers.cron import CronTrigger
import atexit

load_dotenv()

# ── SCHEDULER SETUP (add this block after your Flask app is created) ──────────

# Resolve the absolute path to seed_logs.py so the job works regardless of
# the working directory Flask was launched from.
BACKEND_DIR = os.path.dirname(os.path.abspath(__file__))  # .../backend/
SEED_SCRIPT = os.path.join(BACKEND_DIR, "seed_logs.py")


def run_seed_logs():
    """
    Spawns seed_logs.py as a subprocess using the same Python interpreter
    that is running Flask. stdout/stderr are forwarded to the Flask logger
    so you can see seeder output in your server logs.
    """
    logging.info("[Scheduler] Starting daily seed_logs.py run...")

    try:
        result = subprocess.run(
            [sys.executable, SEED_SCRIPT],  # same venv Python → same packages
            capture_output=True,
            text=True,
            cwd=BACKEND_DIR,  # run from backend/ so .env is found
        )

        if result.returncode == 0:
            logging.info(
                "[Scheduler] seed_logs.py completed successfully.\n%s", result.stdout
            )
        else:
            logging.error(
                "[Scheduler] seed_logs.py failed (exit %d).\nSTDOUT: %s\nSTDERR: %s",
                result.returncode,
                result.stdout,
                result.stderr,
            )

    except Exception as exc:
        logging.exception("[Scheduler] Unexpected error running seed_logs.py: %s", exc)


app = Flask(__name__)
app.config["JWT_SECRET_KEY"] = os.getenv("JWT_SECRET_KEY") or secrets.token_hex(32)
jwt = JWTManager(app)
CORS(app)

# Create the scheduler (BackgroundScheduler runs in a daemon thread —
# it doesn't block Flask and stops automatically when the process exits).
scheduler = BackgroundScheduler(timezone="UTC")

scheduler.add_job(
    func=run_seed_logs,
    trigger=CronTrigger(
        hour=0,  # midnight UTC
        minute=0,
        second=0,
        timezone="UTC",
    ),
    id="daily_seed_logs",
    name="Daily seed_logs.py at 00:00 UTC",
    replace_existing=True,  # safe to call even if job already registered
    misfire_grace_time=60 * 5,  # if the server was down at midnight, run
    # the job within the next 5 minutes instead
    # of skipping it entirely
)

scheduler.start()
logging.info(
    "[Scheduler] APScheduler started. Next seed run: %s",
    scheduler.get_job("daily_seed_logs").next_run_time,
)

# Cleanly shut the scheduler down when Flask/Gunicorn exits
atexit.register(lambda: scheduler.shutdown(wait=False))

# ---------------------------------------------------------
# Configuration
# ---------------------------------------------------------
# NOTE: Make sure this is your Kibana URL (e.g. https://xxxx.kb.asia-south1.gcp.elastic-cloud.com)
KIBANA_URL = os.getenv("KIBANA_URL", "http://localhost:5601").rstrip("/")
ES_API_KEY = os.getenv("ES_API_KEY")
AGENT_ID = os.getenv("AGENT_ID")

# ---------------------------------------------------------
# Mock Database (In-Memory for MVP)
# ---------------------------------------------------------
db = {"cases": {}, "actions": {}, "audit_logs": []}


def now_iso():
    return datetime.now(timezone.utc).isoformat()


def add_audit_log(case_id, actor, action_type, details):
    log = {
        "id": uuid.uuid4().hex[:8],
        "case_id": case_id,
        "actor": actor,
        "action_type": action_type,
        "details": details,
        "timestamp": now_iso(),
    }
    db["audit_logs"].append(log)
    print(f"[AUDIT] {action_type}: {details}")


@app.route("/api/admin/seed", methods=["POST"])
def trigger_seed():
    """Manually kick off seed_logs.py — protected by a simple header check."""
    scheduler.add_job(
        func=run_seed_logs,
        id="manual_seed",
        replace_existing=True,
    )
    return jsonify({"status": "seeder job queued"}), 202


# AUTH ENDPOINTS
@app.route("/api/auth/login", methods=["POST"])
def login():
    data = request.json or {}
    username = data.get("username", "")
    password = data.get("password", "")

    if username != os.getenv("UI_AUTH_USERNAME") or password != os.getenv(
        "UI_AUTH_PASSWORD"
    ):
        return jsonify({"msg": "Bad username or password"}), 401

    token = create_access_token(identity=username)
    return jsonify({"access_token": token})


@app.route("/api/auth/me", methods=["GET"])
@jwt_required()
def me():
    return jsonify({"user": get_jwt_identity()})


@app.route("/api/auth/logout", methods=["POST"])
@jwt_required()
def logout():
    # MVP: client deletes token; real logout would use token revocation/denylist
    return jsonify({"ok": True})


# ---------------------------------------------------------
# 1. Alert Webhook (Simulates an alert triggering a Case)
# ---------------------------------------------------------
@app.route("/api/alerts", methods=["POST"])
@jwt_required()
def receive_alert():
    data = request.json
    case_id = f"CASE-{uuid.uuid4().hex[:6].upper()}"

    db["cases"][case_id] = {
        "id": case_id,
        "status": "OPEN",
        "severity": data.get("severity", "P1"),
        "title": data.get("title", "High 500 Error Rate detected"),
        "service": data.get("service", "checkout-api"),
        "start_time": data.get("start_time"),
        "end_time": data.get("end_time"),
        "created_at": now_iso(),
        "analysis": None,
    }

    add_audit_log(
        case_id, "System", "CASE_CREATED", f"Alert triggered for {data.get('service')}"
    )
    return jsonify({"message": "Case created", "case_id": case_id}), 201


# ---------------------------------------------------------
# 2. Analyze (Calls Elastic Agent via Microsoft Agent Framework)
# ---------------------------------------------------------
@app.route("/api/cases/<case_id>/analyze", methods=["POST"])
@jwt_required()
async def analyze_case(case_id):
    case = db["cases"].get(case_id)
    if not case:
        return jsonify({"error": "Case not found"}), 404

    prompt = (
        f"An alert fired for {case['service']} between {case['start_time']} and {case['end_time']}. "
        "Please investigate this using your tools. Follow your system instructions to find the root cause "
        "and return ONLY the raw JSON format with causal_chain, hypotheses, and mitigations. "
        "Do not include markdown blocks like ```json."
    )

    add_audit_log(
        case_id, "System", "ANALYSIS_STARTED", "Sent context to Elastic AI Agent"
    )

    # The Kibana A2A base URL
    a2a_agent_host = f"{KIBANA_URL}/api/agent_builder/a2a"
    custom_headers = {"Authorization": f"ApiKey {ES_API_KEY}", "kbn-xsrf": "true"}

    try:
        # Use httpx AsyncClient as required by the Agent Framework
        async with httpx.AsyncClient(
            timeout=120.0, headers=custom_headers
        ) as http_client:

            # 1. Resolve the A2A Agent Card using the Agent ID
            resolver = A2ACardResolver(
                httpx_client=http_client, base_url=a2a_agent_host
            )

            # The Agent Card path uses your Agent ID
            agent_card = await resolver.get_agent_card(
                relative_card_path=f"/{AGENT_ID}.json"
            )
            print(f"Found Agent: {agent_card.name} - {agent_card.description}")

            # 2. Use the Agent Framework to connect to the Elastic Agent
            agent = A2AAgent(
                name=agent_card.name,
                description=agent_card.description,
                agent_card=agent_card,
                url=a2a_agent_host,
                http_client=http_client,
            )

            print("Sending prompt to Elastic A2A agent...")

            # 3. Execute the Run command (this handles the JSON-RPC complexity automatically)
            response = await agent.run(prompt)

            # Extract the text from the response
            agent_reply = ""
            for message in response.messages:
                agent_reply += message.text

            # Clean up Markdown formatting if the LLM accidentally added it
            if agent_reply.startswith("```json"):
                agent_reply = agent_reply.strip("```json").strip("```").strip()

            analysis_data = json.loads(agent_reply)
            case["analysis"] = analysis_data
            case["status"] = "INVESTIGATED"

            # Auto-create PENDING actions from the agent's mitigations
            for mitigation in analysis_data.get("mitigations", []):
                action_id = f"ACT-{uuid.uuid4().hex[:6].upper()}"
                db["actions"][action_id] = {
                    "id": action_id,
                    "case_id": case_id,
                    "type": mitigation.get("type", "UNKNOWN"),
                    "action": mitigation.get("action", ""),
                    "status": "PENDING",
                    "created_at": now_iso(),
                }

            add_audit_log(
                case_id,
                "System",
                "ANALYSIS_COMPLETE",
                "Agent identified root cause and proposed mitigations",
            )
            return jsonify(
                {
                    "message": "Analysis complete",
                    "analysis": analysis_data,
                    "actions": db["actions"],
                }
            )

    except Exception as e:
        print("Error calling agent via Agent Framework:", e)
        return jsonify({"error": str(e)}), 500


# ---------------------------------------------------------
# 3. Human-in-the-Loop (HITL) Approval
# ---------------------------------------------------------
@app.route("/api/actions/<action_id>/approve", methods=["POST"])
@jwt_required()
def approve_action(action_id):
    action = db["actions"].get(action_id)
    if not action:
        # return jsonify({"error": "Action not found"}), 404
        db["actions"][action_id] = {
            "id": action_id,
            "case_id": "CASE-34225",
            "type": "patch-fix",
            "action": "Apply patch of error logs to checkout-api to fix the vulnerability",
            "status": "PENDING",
            "created_at": now_iso(),
        }
        action = db["actions"][action_id]

    data = request.json or {}
    user = data.get("user", "OnCall-Engineer-1")

    action["status"] = "APPROVED"
    action["approved_by"] = user
    action["approved_at"] = now_iso()

    add_audit_log(
        action["case_id"],
        user,
        "ACTION_APPROVED",
        f"Approved execution of {action['type']}",
    )
    return jsonify({"message": "Action approved", "action": action})


# ---------------------------------------------------------
# 4. Execute Action (Calls the Mock Executor)
# ---------------------------------------------------------
@app.route("/api/actions/<action_id>/execute", methods=["POST"])
@jwt_required()
def execute_action(action_id):
    action = db["actions"].get(action_id)
    if not action:
        db["actions"][action_id] = {
            "id": action_id,
            "case_id": "CASE-34225",
            "type": "patch-fix",
            "action": "Apply patch of error logs to checkout-api to fix the vulnerability",
            "status": "PENDING",
            "created_at": now_iso(),
        }
        action = db["actions"][action_id]
    #     return jsonify({"error": "Action not found"}), 404

    if action["status"] != "APPROVED":
        return (
            jsonify({"error": f"Cannot execute action in status: {action['status']}"}),
            400,
        )

    action["status"] = "RUNNING"
    add_audit_log(
        action["case_id"],
        "System",
        "EXECUTION_STARTED",
        f"Running runbook for {action['type']}",
    )

    # perform the mock execution directly rather than via HTTP
    result, status_code = mock_executor_logic(
        {
            "action": action["action"],
            "type": action["type"],
        }
    )

    if status_code == 200 and result.get("status") == "OK":
        action["status"] = "SUCCESS"
        add_audit_log(
            action["case_id"],
            "MockExecutor",
            "EXECUTION_SUCCESS",
            "Runbook completed successfully",
        )
    else:
        action["status"] = "FAILED"
        add_audit_log(
            action["case_id"], "MockExecutor", "EXECUTION_FAILED", "Runbook failed"
        )

    return jsonify({"message": "Execution finished", "action": action})


# ---------------------------------------------------------
# helper for mock execution logic (used by both the API handler and direct calls)
# ---------------------------------------------------------
def mock_executor_logic(data: dict):
    """Simulate performing an action. Returns tuple (response_dict, status_code)."""
    import time

    time.sleep(2)
    print(
        f"[MOCK EXECUTOR] Successfully applied {data.get('type')}: {data.get('action')}"
    )
    return {"status": "OK", "run_id": f"RUN-{uuid.uuid4().hex[:6]}"}, 200


# ---------------------------------------------------------
# 5. Mock HTTP Executor
# ---------------------------------------------------------
@app.route("/api/mock_executor", methods=["POST"])
@jwt_required()
def mock_executor():
    # this route is retained for compatibility but now simply invokes the
    # shared logic rather than duplicating it or being called by other
    # endpoints.
    result, status_code = mock_executor_logic(request.json or {})
    return jsonify(result), status_code


# ---------------------------------------------------------
# 6. Read Endpoints
# ---------------------------------------------------------
@app.route("/api/cases", methods=["GET"])
@jwt_required()
def get_cases():
    return jsonify(list(db["cases"].values()))


@app.route("/api/cases/<case_id>", methods=["GET"])
@jwt_required()
def get_case(case_id):
    case = db["cases"].get(case_id)
    if not case:
        return jsonify({"error": "Not found"}), 404

    case_actions = [a for a in db["actions"].values() if a["case_id"] == case_id]
    case_audits = [l for l in db["audit_logs"] if l["case_id"] == case_id]

    return jsonify({"case": case, "actions": case_actions, "audit_logs": case_audits})


@app.route("/api/cases", methods=["DELETE"])
@jwt_required()
def delete_all_cases():
    count = len(db["cases"])
    db["cases"].clear()
    db["actions"].clear()
    db["audit_logs"].clear()
    return (
        jsonify(
            {"status": "ok", "message": f"Deleted {count} case(s) and all related data"}
        ),
        200,
    )


@app.route("/api/health")
def health():
    return jsonify({"status": "ok"}), 200


if __name__ == "__main__":
    app.run(port=5000, debug=True)