"""OpenRouter 余额。

接口：GET https://openrouter.ai/api/v1/credits
响应：{"data": {"total_credits": 100.5, "total_usage": 25.75}}
余额取剩余可用：total_credits - total_usage
"""

from __future__ import annotations

from app.expr import evaluate_balance
from app.providers.base import BalanceProvider


class OpenRouterProvider(BalanceProvider):
    id = "openrouter"
    name = "OpenRouter"
    currency = "USD"
    icon = "OpenRouter"
    description = "OpenRouter 余额（GET /api/v1/credits，Bearer 认证，剩余 = total_credits - total_usage）"

    def build_request(self, api_key: str) -> tuple[str, dict, str | None]:
        return (
            "https://openrouter.ai/api/v1/credits",
            {"Authorization": f"Bearer {api_key}"},
            None,
        )

    def extract_balance(self, data: object) -> float:
        return evaluate_balance(data, "data.total_credits - data.total_usage")