package com.adx.tencent.oppo.service;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.time.Instant;
import java.util.Base64;

/** OPPO ownerToken 本地生成服务。 */
public class OppoAuthService {

    public String getOwnerToken(String ownerId, String apiId, String apiKey) {
        if (ownerId == null || ownerId.isBlank()
                || apiId == null || apiId.isBlank()
                || apiKey == null || apiKey.isBlank()) {
            throw new IllegalStateException("OPPO ownerId/apiId/apiKey are required");
        }
        long now = Instant.now().getEpochSecond();
        String sign = sha1(apiId + apiKey + now);
        return Base64.getEncoder().encodeToString(
                (ownerId + "," + apiId + "," + now + "," + sign).getBytes(StandardCharsets.UTF_8));
    }

    private static String sha1(String value) {
        try {
            byte[] digest = MessageDigest.getInstance("SHA-1").digest(value.getBytes(StandardCharsets.UTF_8));
            StringBuilder result = new StringBuilder();
            for (byte b : digest) result.append(String.format("%02x", b));
            return result.toString();
        } catch (Exception e) {
            throw new IllegalStateException("OPPO token sign failed", e);
        }
    }
}