class EnableFuelRateTool:
    name = 'enable_fuel_rate'
    route_path = '/mcp/tools/enableFuelRate'
    backend = 'base'

    def __init__(self, api_client=None):
        self.api_client = api_client

    def metadata(self):
        return {
            'name': self.name,
            'description': (
                '使用场景：把燃油系数生效或启用。燃油代码必须来自query_fuel_rate_list，格式为RY加数字。'
                '可以一次启用多条，最多20条。草稿和失效都可以启用。'
                '已经启用的不能再次启用。'
                '禁止使用：新增、编辑、失效、删除、手填不存在的燃油代码。'
                '参数只用于工具内部调用；最终回答只能展示中文业务名称和燃油代码。'
            ),
            'input_schema': {
                'type': 'object',
                'properties': {
                    'fuel_no': {
                        'type': 'array',
                        'minItems': 1,
                        'maxItems': 20,
                        'items': {
                            'type': 'string',
                            'minLength': 1,
                            'maxLength': 20,
                        },
                        'description': '要启用的燃油代码，例如["RY12"]。',
                    },
                },
                'required': ['fuel_no'],
                'additionalProperties': False,
            },
        }

    def call(self, fuel_no, request_id='rq_enable_fuel_rate'):
        if self.api_client is None:
            raise RuntimeError('api client is required for enable_fuel_rate')
        return self.api_client.call_tool(
            self.name,
            self.route_path,
            {'fuel_no': _fuel_numbers(fuel_no)},
            request_id,
        )


def _fuel_numbers(value):
    if isinstance(value, str):
        value = [value]
    if not isinstance(value, list) or not value or len(value) > 20:
        raise ValueError('fuel_no is invalid')
    numbers = []
    seen = set()
    for item in value:
        if not isinstance(item, str) or not item.strip() or len(item.strip()) > 20:
            raise ValueError('fuel_no is invalid')
        number = item.strip()
        if number in seen:
            continue
        seen.add(number)
        numbers.append(number)
    return numbers