import { Provide, Scope, ScopeEnum } from "@midwayjs/core";
import { BaseService, Constants, CodeException, PageReq } from "@certd/lib-server";
import { InjectEntityModel } from "@midwayjs/typeorm";
import { Repository } from "typeorm";
import { OpenKeyEntity } from "../entity/open-key.js";
import { utils } from "@certd/basic";
import crypto from "crypto";
import dayjs from "dayjs";

export type OpenKey = {
  userId: number;
  projectId?: number;
  keyId: string;
  keySecret: string;
  encrypt: boolean;
  scope: string;
};
@Provide()
@Scope(ScopeEnum.Request, { allowDowngrade: true })
export class OpenKeyService extends BaseService<OpenKeyEntity> {
  @InjectEntityModel(OpenKeyEntity)
  repository: Repository<OpenKeyEntity>;

  //@ts-ignore
  getRepository() {
    return this.repository;
  }

  async page(pageReq: PageReq<OpenKeyEntity>) {
    return await super.page(pageReq);
  }

  async add(bean: OpenKeyEntity) {
    return await this.generate(bean.userId, bean.projectId, bean.scope);
  }

  async generate(userId: number, projectId?: number, scope = "open") {
    const keyId = utils.id.simpleNanoId(18) + "_key";
    const secretKey = crypto.randomBytes(32);
    const keySecret = Buffer.from(secretKey).toString("hex");
    const entity = new OpenKeyEntity();
    entity.userId = userId;
    entity.projectId = projectId;
    entity.keyId = keyId;
    entity.keySecret = keySecret;
    entity.scope = scope ?? "open";
    await this.repository.save(entity);
    return entity;
  }

  async getByKeyId(keyId: string) {
    if (!keyId) {
      throw new Error("keyId不能为空");
    }
    return this.repository.findOne({ where: { keyId } });
  }

  async verifyOpenKey(openKey: string): Promise<OpenKey> {
    // openkey 组成，content = base64({keyId,t,encrypt,signType}) ,sign = md5({keyId,t,encrypt,signType}secret) , key = content.sign
    const [content, sign] = openKey.split(".");
    const contentJson = Buffer.from(content, "base64").toString();
    const { keyId, t, encrypt, signType } = JSON.parse(contentJson);
    // 正负不超过3分钟 ,timestamps单位为秒
    if (Math.abs(Number(t) - Math.floor(Date.now() / 1000)) > 180) {
      throw new CodeException(Constants.res.openKeyExpiresError);
    }

    const entity = await this.getByKeyId(keyId);
    if (!entity) {
      throw new Error("openKey不存在");
    }
    const secret = entity.keySecret;
    let computedSign = "";
    if (signType === "md5") {
      computedSign = utils.hash.md5(contentJson + secret);
    } else if (signType === "sha256") {
      computedSign = utils.hash.sha256(contentJson + secret);
    } else {
      throw new CodeException(Constants.res.openKeySignTypeError);
    }
    if (Buffer.from(computedSign).toString("base64") !== sign) {
      throw new CodeException(Constants.res.openKeySignError);
    }

    if (entity.userId == null) {
      throw new CodeException(Constants.res.openKeyError);
    }

    return {
      userId: entity.userId,
      keyId: entity.keyId,
      keySecret: entity.keySecret,
      encrypt: encrypt,
      projectId: entity.projectId,
      scope: entity.scope,
    };
  }

  async getApiToken(id: number) {
    if (!id) {
      throw new Error("id不能为空");
    }
    const entity = await this.repository.findOne({ where: { id } });
    if (!entity) {
      throw new Error("id不存在");
    }
    const { keyId, keySecret } = entity;
    const openKey = {
      keyId,
      t: dayjs().unix(),
      encrypt: false,
      signType: "md5",
    };
    const content = JSON.stringify(openKey);
    const sign = utils.hash.md5(content + keySecret);
    return Buffer.from(content).toString("base64") + "." + Buffer.from(sign).toString("base64");
  }
}