import { env } from "indite-js/env";
import { Client, PostPolicyResult } from "minio";

type Props = {
  filePath: string;
  fileType?: string;
  maxFileSize?: number;
};

const tenMinutes = 10 * 60;

export const generatePresignedPostPolicy = async ({
  filePath,
  fileType,
  maxFileSize,
}: Props): Promise<PostPolicyResult> => {
  if (!env.S3_ENDPOINT || !env.S3_ACCESS_KEY || !env.S3_SECRET_KEY)
    throw new Error(
      "S3 not properly configured. Missing one of those variables: S3_ENDPOINT, S3_ACCESS_KEY, S3_SECRET_KEY"
    );

  const minioClient = new Client({
    endPoint: env.S3_ENDPOINT,
    port: env.S3_PORT,
    useSSL: env.S3_SSL,
    accessKey: env.S3_ACCESS_KEY,
    secretKey: env.S3_SECRET_KEY,
    region: env.S3_REGION,
  });

  const postPolicy = minioClient.newPostPolicy();
  if (maxFileSize)
    postPolicy.setContentLengthRange(0, maxFileSize * 1024 * 1024);
  postPolicy.setKey(filePath);
  postPolicy.setBucket(env.S3_BUCKET);
  postPolicy.setExpires(new Date(Date.now() + tenMinutes * 1000));
  postPolicy.formData["Cache-Control"] = "public, max-age=86400";
  postPolicy.policy.conditions.push([
    "eq",
    "$Cache-Control",
    "public, max-age=86400",
  ]);
  if (fileType) postPolicy.setContentType(fileType);

  return minioClient.presignedPostPolicy(postPolicy);
};