"""
Client management API.
Clients group sheets and have their own dropdown (category/media) hierarchy.
"""

import json
import logging
import os
import random
import time
from datetime import datetime, timezone

from quart import Blueprint, jsonify, request

from ..auth.middleware import auth_required, admin_required
from ..config_runtime import server_config

logger = logging.getLogger(__name__)

clients_bp = Blueprint('clients', __name__, url_prefix='/api/clients')


def load_clients() -> list:
    path = server_config.CLIENTS_FILE
    if not os.path.exists(path):
        return []
    try:
        with open(path, 'r') as f:
            return json.load(f)
    except Exception:
        return []


def _save_clients(clients: list):
    with open(server_config.CLIENTS_FILE, 'w') as f:
        json.dump(clients, f, indent=2)


def get_client_by_id(client_id: str) -> dict | None:
    for c in load_clients():
        if c['id'] == client_id:
            return c
    return None


@clients_bp.route('', methods=['GET'])
@auth_required
async def list_clients():
    return jsonify({'clients': load_clients()})


@clients_bp.route('', methods=['POST'])
@admin_required
async def create_client():
    body = await request.get_json() or {}
    name = body.get('name', '').strip()
    if not name:
        return jsonify({'error': 'name_required', 'message': 'Client name is required'}), 400

    client_id = f"client_{int(time.time())}{random.randint(100, 999)}"
    client = {
        'id': client_id,
        'name': name,
        'created': datetime.now(timezone.utc).isoformat(),
        'hasCustomDropdowns': False,
    }
    clients = load_clients()
    clients.append(client)
    _save_clients(clients)
    return jsonify({'client': client}), 201


@clients_bp.route('/<client_id>', methods=['DELETE'])
@admin_required
async def delete_client(client_id: str):
    clients = load_clients()
    clients = [c for c in clients if c['id'] != client_id]
    _save_clients(clients)

    # Remove client-specific dropdown file if present
    dropdown_path = os.path.join(server_config.CLIENTS_DROPDOWNS_DIR, f"{client_id}.json")
    if os.path.exists(dropdown_path):
        os.remove(dropdown_path)

    return jsonify({'success': True})


@clients_bp.route('/<client_id>', methods=['PATCH'])
@admin_required
async def update_client(client_id: str):
    body = await request.get_json() or {}
    clients = load_clients()
    updated = None
    for c in clients:
        if c['id'] == client_id:
            if 'name' in body:
                c['name'] = body['name'].strip()
            updated = c
            break
    if not updated:
        return jsonify({'error': 'not_found'}), 404
    _save_clients(clients)
    return jsonify({'client': updated})