"use server";

import { s3 } from "@/lib/s3";
import {
  DeleteObjectCommand,
  ListObjectsV2Command,
  PutObjectCommand,
} from "@aws-sdk/client-s3";

const PREFIX = "commissions/examples/";

export type CommissionExampleItem = {
  key: string;
  url: string;
  size: number | null;
  lastModified: string | null;
};

function buildImageUrl(key: string) {
  return `/api/image/${encodeURI(key)}`;
}

function sanitizeFilename(name: string) {
  return name.replace(/[^a-zA-Z0-9._-]/g, "_");
}

export async function listCommissionExamples(): Promise<CommissionExampleItem[]> {
  const command = new ListObjectsV2Command({
    Bucket: `${process.env.BUCKET_NAME}`,
    Prefix: PREFIX,
  });

  const res = await s3.send(command);
  return (
    res.Contents?.filter((obj) => obj.Key && obj.Key !== PREFIX).map((obj) => {
      const key = obj.Key as string;
      return {
        key,
        url: buildImageUrl(key),
        size: obj.Size ?? null,
        lastModified: obj.LastModified?.toISOString() ?? null,
      };
    }) ?? []
  );
}

export async function uploadCommissionExample(
  formData: FormData
): Promise<CommissionExampleItem> {
  const file = formData.get("file");

  if (!(file instanceof File)) {
    throw new Error("Missing file");
  }

  if (!file.type.startsWith("image/")) {
    throw new Error("Only image uploads are allowed");
  }

  const safeName = sanitizeFilename(file.name || "example");
  const key = `${PREFIX}${Date.now()}-${safeName}`;
  const buffer = Buffer.from(await file.arrayBuffer());

  await s3.send(
    new PutObjectCommand({
      Bucket: `${process.env.BUCKET_NAME}`,
      Key: key,
      Body: buffer,
      ContentType: file.type,
    })
  );

  return {
    key,
    url: buildImageUrl(key),
    size: file.size,
    lastModified: new Date().toISOString(),
  };
}

export async function deleteCommissionExample(key: string) {
  if (!key.startsWith(PREFIX)) {
    throw new Error("Invalid key");
  }

  await s3.send(
    new DeleteObjectCommand({
      Bucket: `${process.env.BUCKET_NAME}`,
      Key: key,
    })
  );
}