import { serverSupabaseServiceRole } from "../../utils/useSupabase";

/**
 * POST /api/community/upload-image
 * Body: { dataUrl: string } (base64 JPEG/PNG)
 * Returns: { url: string }
 */
export default defineEventHandler(async (event) => {
  const user = await requireUser(event);
  const body = (await readBody(event)) as { image?: string; dataUrl?: string };
  const dataUrl = body.image ?? body.dataUrl;

  if (!dataUrl?.startsWith("data:image/")) {
    throw createError({ statusCode: 400, message: "Ungültige Bilddaten" });
  }

  const match = dataUrl.match(/^data:(image\/\w+);base64,(.+)$/);
  if (!match)
    throw createError({ statusCode: 400, message: "Ungültiges Bildformat" });

  const contentType = match[1];
  const ext = contentType === "image/png" ? "png" : "jpg";
  const base64 = match[2];

  // Max 5MB check
  const sizeBytes = Math.ceil((base64.length * 3) / 4);
  if (sizeBytes > 5 * 1024 * 1024) {
    throw createError({ statusCode: 400, message: "Bild zu groß (max 5MB)" });
  }

  const binaryStr = atob(base64);
  const bytes = new Uint8Array(binaryStr.length);
  for (let i = 0; i < binaryStr.length; i++) {
    bytes[i] = binaryStr.charCodeAt(i);
  }
  const blob = new Blob([bytes], { type: contentType });

  const supabase = serverSupabaseServiceRole(event);
  const fileName = `posts/${user.id}/${Date.now()}.${ext}`;

  const { error: uploadError } = await supabase.storage
    .from("rebreak-avatars")
    .upload(fileName, blob, { contentType, upsert: false });

  if (uploadError) {
    console.error("[community/upload-image] Storage error:", uploadError);
    throw createError({ statusCode: 500, message: uploadError.message });
  }

  const { data: urlData } = supabase.storage
    .from("rebreak-avatars")
    .getPublicUrl(fileName);

  return { url: urlData.publicUrl };
});