package com.yau.digitalrmb.institutionidentity.application;

import com.yau.digitalrmb.shared.api.ErrorCode;
import com.yau.digitalrmb.shared.exception.BusinessException;
import org.springframework.security.oauth2.jwt.Jwt;

public class InstitutionKeySubject {
    private final long userId;
    private final long schoolId;
    private final long classId;

    public InstitutionKeySubject(long userId, long schoolId, long classId) {
        this.userId = userId;
        this.schoolId = schoolId;
        this.classId = classId;
    }

    public static InstitutionKeySubject from(Jwt jwt) {
        return new InstitutionKeySubject(requiredLong(jwt, "userId"), requiredLong(jwt, "schoolId"),
                requiredLong(jwt, "classId"));
    }

    private static long requiredLong(Jwt jwt, String claim) {
        Object value = jwt.getClaims().get(claim);
        if (value == null) {
            throw new BusinessException(ErrorCode.UNAUTHORIZED, "Token缺少" + claim);
        }
        try {
            return Long.parseLong(String.valueOf(value));
        } catch (NumberFormatException exception) {
            throw new BusinessException(ErrorCode.UNAUTHORIZED, "Token中的" + claim + "格式不正确");
        }
    }

    public long getUserId() { return userId; }
    public long getSchoolId() { return schoolId; }
    public long getClassId() { return classId; }
}