/* Copyright 2026 Marimo. All rights reserved. */

import { type DropzoneOptions, useDropzone } from "react-dropzone";
import { toast } from "@/components/ui/use-toast";
import { useRequestClient } from "@/core/network/requests";
import { serializeBlob } from "@/utils/blob";
import { withLoadingToast } from "@/utils/download";
import { Logger } from "@/utils/Logger";
import { type FilePath, PathBuilder } from "@/utils/paths";
import { refreshRoot } from "./state";

const MAX_SIZE = 1024 * 1024 * 100; // 100MB

export function useFileExplorerUpload(options: DropzoneOptions = {}) {
  const { sendCreateFileOrFolder } = useRequestClient();
  return useDropzone({
    multiple: true,
    maxSize: MAX_SIZE,
    onError: (error) => {
      Logger.error(error);
      toast({
        title: "File upload failed",
        description: error.message,
        variant: "danger",
      });
    },
    onDropRejected: (rejectedFiles) => {
      toast({
        title: "File upload failed",
        description: (
          <div className="flex flex-col gap-1">
            {rejectedFiles.map((file) => (
              <div key={file.file.name}>
                {file.file.name} ({file.errors.map((e) => e.message).join(", ")}
                )
              </div>
            ))}
          </div>
        ),
        variant: "danger",
      });
    },
    onDrop: async (acceptedFiles) => {
      if (acceptedFiles.length === 0) {
        return;
      }
      const isSingle = acceptedFiles.length === 1;

      const loadingTitle = isSingle
        ? "Uploading file..."
        : "Uploading files...";
      const onFinish = {
        title: isSingle
          ? "File uploaded"
          : `${acceptedFiles.length} files uploaded`,
      };

      await withLoadingToast(
        loadingTitle,
        async (progress) => {
          progress.addTotal(acceptedFiles.length);
          for (const file of acceptedFiles) {
            // We strip the leading slash since File.path can return
            // `/path/to/file`.
            const filePath = stripLeadingSlash(getPath(file));
            let directoryPath = "" as FilePath;
            if (filePath) {
              directoryPath =
                PathBuilder.guessDeliminator(filePath).dirname(filePath);
            }

            // File contents are sent base64-encoded to support arbitrary
            // bytes data
            //
            // get the raw base64-encoded data from a string starting with
            // data:*/*;base64,
            const base64 = (await serializeBlob(file)).split(",")[1];
            await sendCreateFileOrFolder({
              path: directoryPath,
              type: "file",
              name: file.name,
              contents: base64,
            });
            progress.increment(1);
          }
          await refreshRoot();
        },
        onFinish,
      );
    },
    ...options,
  });
}

/**
 * Get the path of a file.
 *
 * Types only have `webkitRelativePath`, but File objects in the browser
 * can have `path` and `relativePath`.
 */
function getPath(file: File): FilePath | undefined {
  if (file.webkitRelativePath) {
    return file.webkitRelativePath as FilePath;
  }
  if ("path" in file && typeof file.path === "string") {
    return file.path as FilePath;
  }
  if ("relativePath" in file && typeof file.relativePath === "string") {
    return file.relativePath as FilePath;
  }
  return undefined;
}

/**
 * Strip leading slashes from a path.
 *
 * TODO: this may not support windows paths.
 */
function stripLeadingSlash(path: FilePath | undefined): FilePath | undefined {
  if (!path) {
    return undefined;
  }
  return path.replace(/^\/+/, "") as FilePath;
}