feat: implement file upload functionality and enhance admin dashboard layout

app/layouts/admin/dashboard.tsx

@@ -3,6 +3,7 @@ import type { PropsWithChildren } from 'react'
 
 import { useAdminContext } from '~/contexts/admin'
 
+import { FormUpload } from './form-upload'
 import { Navbar } from './navbar'
 import { Sidebar } from './sidebar'
 
@@ -34,7 +35,7 @@ export const AdminDashboardLayout = (properties: PropsWithChildren) => {
             transition
             className="max-w-lg space-y-6 rounded-lg bg-white p-8 duration-300 ease-out data-[closed]:scale-95 data-[closed]:opacity-0 sm:shadow-lg"
           >
-            Upload di mari {isUploadOpen}
+            <FormUpload />
           </DialogPanel>
         </div>
       </Dialog>

app/layouts/admin/form-upload.tsx

@@ -0,0 +1,122 @@
+import { Button } from '@headlessui/react'
+import { zodResolver } from '@hookform/resolvers/zod'
+import { useEffect, useState, type ChangeEvent } from 'react'
+import { useFetcher } from 'react-router'
+import { RemixFormProvider, useRemixForm } from 'remix-hook-form'
+import { z } from 'zod'
+
+import { uploadCategorySchema, useAdminContext } from '~/contexts/admin'
+
+export const uploadSchema = z.object({
+  file: z.instanceof(File),
+  category: uploadCategorySchema,
+})
+
+export type TUploadSchema = z.infer<typeof uploadSchema>
+
+export const FormUpload = () => {
+  const { isUploadOpen, setUploadedFile, setIsUploadOpen } = useAdminContext()
+  const fetcher = useFetcher()
+  const [disabled, setDisabled] = useState(false)
+  const [error, setError] = useState<string>()
+  const maxFileSize = 1024 // 1MB
+
+  const formMethods = useRemixForm<TUploadSchema>({
+    mode: 'onSubmit',
+    fetcher,
+    resolver: zodResolver(uploadSchema),
+  })
+
+  const { handleSubmit, register, setValue } = formMethods
+
+  useEffect(() => {
+    if (!fetcher.data?.success) {
+      setError(fetcher.data?.message)
+      setDisabled(false)
+      return
+    }
+
+    setUploadedFile(fetcher.data.uploadData.data.file_url)
+    setIsUploadOpen(undefined)
+
+    setDisabled(true)
+    setError(undefined)
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [fetcher])
+
+  const handleChange = async function (event: ChangeEvent<HTMLInputElement>) {
+    event.preventDefault()
+    if (event.target.files && event.target.files[0]) {
+      const files: File[] = [...event.target.files]
+
+      onChange(files, event)
+    }
+  }
+
+  const onChange = async function (
+    files: File[],
+    event: ChangeEvent<HTMLInputElement>,
+  ) {
+    const file = files[0]
+    const img = new Image()
+
+    if (!file.type.startsWith('image/')) {
+      setError('Please upload an image file.')
+      return
+    }
+
+    if (file.size > maxFileSize * 1024) {
+      setError(`File size is too big!`)
+      return
+    }
+
+    img.addEventListener('load', () => {
+      handleFiles(event)
+    })
+
+    img.src = URL.createObjectURL(file)
+  }
+
+  const handleFiles = (event: ChangeEvent<HTMLInputElement>) => {
+    const files = event.target.files
+    if (files && files.length > 0) {
+      const file = files[0]
+      setValue('file', file)
+    }
+  }
+
+  return (
+    <RemixFormProvider {...formMethods}>
+      <fetcher.Form
+        method="post"
+        onSubmit={handleSubmit}
+        className="space-y-4"
+        action="/actions/admin/upload"
+        encType="multipart/form-data"
+      >
+        {error && (
+          <div className="text-sm text-red-500 capitalize">{error}</div>
+        )}
+        <input
+          type="file"
+          id="input-file-upload"
+          accept="image/*"
+          onChange={handleChange}
+        />
+        <input
+          type="hidden"
+          id="input-file-upload-type"
+          value={isUploadOpen}
+          {...register('category')}
+        />
+        <Button
+          disabled={disabled}
+          type="submit"
+          className="w-full rounded-md bg-[#2E2F7C] py-2 text-white transition hover:bg-blue-800"
+        >
+          Upload
+        </Button>
+      </fetcher.Form>
+    </RemixFormProvider>
+  )
+}