#!/usr/bin/env python3
"""Discover Nova API configuration - simple version without dependencies."""

import json
import os
import sys
import urllib.request
from pathlib import Path


def load_env_file(filepath):
    """Simple .env file loader."""
    env_vars = {}
    if not filepath.exists():
        return env_vars

    with open(filepath, 'r') as f:
        for line in f:
            line = line.strip()
            if line and not line.startswith('#') and '=' in line:
                key, value = line.split('=', 1)
                env_vars[key.strip()] = value.strip()
    return env_vars


def request_json(url, access_token):
    """Make a GET request to the Nova API."""
    request = urllib.request.Request(url)
    request.add_header("Authorization", f"Bearer {access_token}")
    request.add_header("Content-Type", "application/json")
    try:
        with urllib.request.urlopen(request, timeout=10) as response:
            body = response.read().decode("utf-8")
            return json.loads(body) if body else {}
    except urllib.error.HTTPError as exc:
        body = exc.read().decode("utf-8") if exc.fp else ""
        print(f"Error: Nova API returned status {exc.code}")
        print(f"Response: {body}")
        return None
    except Exception as exc:
        print(f"Error: {exc}")
        return None


def main():
    # Try to load from .env.local first, then .env
    env_local = Path("nova-sim/.env.local")
    env_file = Path("nova-sim/.env")

    env_vars = {}
    if env_local.exists():
        env_vars = load_env_file(env_local)
        print(f"Loaded configuration from {env_local}")
    elif env_file.exists():
        env_vars = load_env_file(env_file)
        print(f"Loaded configuration from {env_file}")
    else:
        print("Error: No .env or .env.local file found")
        print("Create one with at least NOVA_INSTANCE_URL and NOVA_ACCESS_TOKEN")
        return 1

    # Get configuration
    instance_url = env_vars.get("NOVA_INSTANCE_URL") or env_vars.get("NOVA_API")
    access_token = env_vars.get("NOVA_ACCESS_TOKEN")
    cell_id = env_vars.get("NOVA_CELL_ID", "cell")

    if not instance_url:
        print("Error: NOVA_INSTANCE_URL (or NOVA_API) not set in .env file")
        return 1

    if not access_token:
        print("Error: NOVA_ACCESS_TOKEN not set in .env file")
        return 1

    print(f"\nConnecting to Nova instance: {instance_url}")
    print(f"Cell ID: {cell_id}")
    print()

    # Fetch controllers
    print("Fetching controllers...")
    controllers_url = f"{instance_url}/api/v2/cells/{cell_id}/controllers"
    controllers_data = request_json(controllers_url, access_token)

    if not controllers_data:
        return 1

    # Handle both list and dict responses
    if isinstance(controllers_data, list):
        controllers = controllers_data
    else:
        controllers = controllers_data.get("instances", [])

    if not controllers:
        print("No controllers found")
        return 1

    print(f"Found {len(controllers)} controller(s):")
    print()

    for controller in controllers:
        # Handle both string and dict controller responses
        if isinstance(controller, str):
            controller_id = controller
        else:
            controller_id = controller.get("controller", "unknown")
        print(f"Controller ID: {controller_id}")

        # Fetch motion groups - try cell-level endpoint first
        motion_groups_url = f"{instance_url}/api/v2/cells/{cell_id}/motion-groups"
        motion_groups_data = request_json(motion_groups_url, access_token)

        if not motion_groups_data:
            # Try controller-specific endpoint
            motion_groups_url = f"{instance_url}/api/v2/cells/{cell_id}/controllers/{controller_id}/motion-groups"
            motion_groups_data = request_json(motion_groups_url, access_token)

        if not motion_groups_data:
            print("  Motion groups: Could not fetch")
            continue

        motion_groups = motion_groups_data.get("motion_groups", [])
        print(f"  Motion groups: {len(motion_groups)}")

        for mg in motion_groups:
            mg_id = mg.get("motion_group", "unknown")
            model = mg.get("model_from_controller", "unknown")
            name = mg.get("name_from_controller", "")

            print(f"    - ID: {mg_id}")
            print(f"      Model: {model}")
            if name:
                print(f"      Name: {name}")

            # Fetch motion group description
            desc_url = f"{instance_url}/api/v2/cells/{cell_id}/controllers/{controller_id}/motion-groups/{mg_id}/description"
            desc_data = request_json(desc_url, access_token)

            if desc_data:
                tcps = desc_data.get("tcps", {})
                if tcps:
                    print(f"      Available TCPs: {', '.join(tcps.keys())}")
            print()

    # Generate recommended .env configuration
    print("\n" + "=" * 60)
    print("RECOMMENDED CONFIGURATION")
    print("=" * 60)

    if controllers:
        # Handle both string and dict controller responses
        controller = controllers[0]
        if isinstance(controller, str):
            controller_id = controller
        else:
            controller_id = controller.get("controller", "unknown")

        # Get motion groups for first controller
        motion_groups_url = f"{instance_url}/api/v2/cells/{cell_id}/controllers/{controller_id}/motion-groups"
        motion_groups_data = request_json(motion_groups_url, access_token)

        if motion_groups_data:
            motion_groups = motion_groups_data.get("motion_groups", [])
            if motion_groups:
                mg = motion_groups[0]
                mg_id = mg.get("motion_group", "unknown")
                model = mg.get("model_from_controller", "unknown")

                print("\nAdd/update these in your .env.local file:")
                print(f"""
NOVA_INSTANCE_URL={instance_url}
NOVA_ACCESS_TOKEN={access_token}
NOVA_CELL_ID={cell_id}
NOVA_CONTROLLER_ID={controller_id}
NOVA_MOTION_GROUP_ID={mg_id}
NOVA_MOTION_GROUP_MODEL={model}
NOVA_TCP_NAME=Flange
NOVA_RESPONSE_RATE_MS=200
""")

    return 0


if __name__ == "__main__":
    sys.exit(main())