import json
import urllib.request


class LicenseClient:
    def __init__(self, base_url, machine_code, timeout=10):
        self.base_url = base_url.rstrip('/')
        self.machine_code = machine_code.strip().upper()
        self.timeout = timeout

    def _post(self, path, payload):
        body = json.dumps(payload).encode('utf-8')
        request = urllib.request.Request(self.base_url + path, body, {'Content-Type': 'application/json'})
        with urllib.request.urlopen(request, timeout=self.timeout) as response:
            return json.loads(response.read().decode('utf-8'))

    def login(self, card_key, device_name=None):
        return self._post('/api/card/verify', {'cardKey': card_key, 'machineCode': self.machine_code, 'deviceName': device_name})

    def heartbeat(self, card_key):
        return self._post('/api/card/heartbeat', {'cardKey': card_key, 'machineCode': self.machine_code})

    def list_devices(self, card_key):
        return self._post('/api/card/devices', {'cardKey': card_key, 'machineCode': self.machine_code})

    def unbind(self, card_key):
        return self._post('/api/card/unbind', {'cardKey': card_key, 'machineCode': self.machine_code})