From d4b6d691264bf21e4e2c97548aaad9aa80678a6b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=81d=C3=A1m=20Kov=C3=A1cs?=
 <43071496+adam-kov@users.noreply.github.com>
Date: Mon, 20 Feb 2023 18:05:15 +0100
Subject: [PATCH] feat(frontend): Add file input app component (#1211)

* feat(frontend): Add file input app component

* fix(frontend): Handle multiple file selects

* fix(frontend): File input styling
---
 .../otherInputs/AppFileInput.svelte           |  43 +++++++
 .../components/apps/editor/Component.svelte   |  48 +++++++-
 .../common/fileInput/FileInput.svelte         | 113 ++++++++++++++++++
 frontend/src/lib/components/common/index.ts   |   1 +
 4 files changed, 202 insertions(+), 3 deletions(-)
 create mode 100644 frontend/src/lib/components/apps/components/otherInputs/AppFileInput.svelte
 create mode 100644 frontend/src/lib/components/common/fileInput/FileInput.svelte

diff --git a/frontend/src/lib/components/apps/components/otherInputs/AppFileInput.svelte b/frontend/src/lib/components/apps/components/otherInputs/AppFileInput.svelte
new file mode 100644
index 0000000000..86a773782a
--- /dev/null
+++ b/frontend/src/lib/components/apps/components/otherInputs/AppFileInput.svelte
@@ -0,0 +1,43 @@
+<script lang="ts">
+	import { getContext } from 'svelte'
+	import { FileInput } from '../../../common'
+	import type { AppInput } from '../../inputType'
+	import type { Output } from '../../rx'
+	import type { AppEditorContext } from '../../types'
+	import InputValue from '../helpers/InputValue.svelte'
+
+	export let id: string
+	export let configuration: Record<string, AppInput>
+	export const staticOutputs: string[] = ['result']
+
+	const { worldStore } = getContext<AppEditorContext>('AppEditorContext')
+
+	let acceptedFileTypes: string[] | undefined = undefined
+	let allowMultiple: boolean | undefined = undefined
+	let text: string | undefined = undefined
+
+	$: outputs = $worldStore?.outputsById[id] as {
+		result: Output<string[] | undefined>
+	}
+
+	// Receives Base64 encoded strings from the input component
+	async function handleChange(files: string[] | undefined) {
+		outputs?.result.set(files)
+	}
+</script>
+
+<InputValue {id} input={configuration.acceptedFileTypes} bind:value={acceptedFileTypes} />
+<InputValue {id} input={configuration.allowMultiple} bind:value={allowMultiple} />
+<InputValue {id} input={configuration.text} bind:value={text} />
+
+<div class="w-full h-full p-1">
+	<FileInput
+		accept={acceptedFileTypes?.length ? acceptedFileTypes?.join(', ') : undefined}
+		multiple={allowMultiple}
+		convertToBase64
+		on:change={({detail}) => {handleChange(detail)}}
+		class="w-full h-full"
+	>
+		{text}
+	</FileInput>
+</div>
diff --git a/frontend/src/lib/components/apps/editor/Component.svelte b/frontend/src/lib/components/apps/editor/Component.svelte
index 2551e2d7b7..d8110a1255 100644
--- a/frontend/src/lib/components/apps/editor/Component.svelte
+++ b/frontend/src/lib/components/apps/editor/Component.svelte
@@ -20,7 +20,8 @@
 		Smile,
 		DollarSign,
 		SeparatorHorizontal,
-		SeparatorVertical
+		SeparatorVertical,
+		Paperclip
 	} from 'lucide-svelte'
 	import type { Size } from 'svelte-grid'
 	import { twMerge } from 'tailwind-merge'
@@ -75,6 +76,7 @@
 	export type IconComponent = BaseComponent<'iconcomponent'>
 	export type HorizontalDividerComponent = BaseComponent<'horizontaldividercomponent'>
 	export type VerticalDividerComponent = BaseComponent<'verticaldividercomponent'>
+	export type FileInputComponent = BaseComponent<'fileinputcomponent'>
 
 	export type AppComponent = BaseAppComponent &
 		(
@@ -104,6 +106,7 @@
 			| IconComponent
 			| HorizontalDividerComponent
 			| VerticalDividerComponent
+			| FileInputComponent
 		)
 
 	// Dimensions key formula: <mobile width>:<mobile height>-<desktop width>:<desktop height>
@@ -1059,7 +1062,43 @@
 				customCss: {},
 				card: false
 			}
-		}
+		},
+		fileinputcomponent: {
+			name: 'File Input',
+			icon: Paperclip,
+			dims: '3:4-6:4',
+			data: {
+				id: '',
+				type: 'fileinputcomponent',
+				componentInput: undefined,
+				configuration: {
+					acceptedFileTypes: {
+						type: 'static',
+						value: [
+							'image/*',
+							'application/pdf'
+						],
+						fieldType: 'array',
+						onlyStatic: true
+					},
+					allowMultiple: {
+						type: 'static',
+						value: false,
+						fieldType: 'boolean',
+						tooltip: 'If allowed, the user will be able to select more than one file',
+						onlyStatic: true
+					},
+					text: {
+						type: 'static',
+						value: 'Drag and drop files or click to select them',
+						fieldType: 'text',
+						onlyStatic: true
+					},
+				},
+				customCss: {},
+				card: false
+			}
+		},
 	}
 
 	const inputs: ComponentSet = {
@@ -1072,6 +1111,7 @@
 			'slidercomponent',
 			'rangecomponent',
 			'dateinputcomponent',
+			'fileinputcomponent',
 			'checkboxcomponent',
 			'selectcomponent'
 		]
@@ -1441,7 +1481,6 @@
 <script lang="ts">
 	import { getContext } from 'svelte'
 	import { fade } from 'svelte/transition'
-	import { classNames } from '$lib/utils'
 	import type { AppEditorContext, BaseAppComponent, ComponentSet } from '../types'
 	import { Loader2 } from 'lucide-svelte'
 	import AppBarChart from '../components/dataDisplay/AppBarChart.svelte'
@@ -1469,6 +1508,7 @@
 	import AppIcon from '../components/dataDisplay/AppIcon.svelte'
 	import AppCurrencyInput from '../components/numberInputs/AppCurrencyInput.svelte'
 	import AppDivider from '../components/AppDivider.svelte'
+	import AppFileInput from '../components/otherInputs/AppFileInput.svelte'
 
 	export let component: AppComponent
 	export let selected: boolean
@@ -1632,6 +1672,8 @@
 			<AppRangeInput {...component} bind:staticOutputs={$staticOutputs[component.id]} />
 		{:else if component.type === 'iconcomponent'}
 			<AppIcon {...component} bind:staticOutputs={$staticOutputs[component.id]} />
+		{:else if component.type === 'fileinputcomponent'}
+			<AppFileInput {...component} bind:staticOutputs={$staticOutputs[component.id]} />
 		{/if}
 	</div>
 </div>
diff --git a/frontend/src/lib/components/common/fileInput/FileInput.svelte b/frontend/src/lib/components/common/fileInput/FileInput.svelte
new file mode 100644
index 0000000000..c7d20c3e59
--- /dev/null
+++ b/frontend/src/lib/components/common/fileInput/FileInput.svelte
@@ -0,0 +1,113 @@
+<script lang="ts">
+	import { createEventDispatcher } from "svelte"
+	import { FileUp } from "lucide-svelte"
+	import Button from "../../common/button/Button.svelte"
+	import { faTrash } from "@fortawesome/free-solid-svg-icons"
+
+	let c = ''
+	export { c as class }
+	export let accept = '*'
+	export let multiple = true
+	export let convertToBase64 = false
+	export let hideIcon = false
+	const dispatch = createEventDispatcher()
+	let input: HTMLInputElement
+	let files: File[] | undefined = undefined
+
+	async function onChange(fileList: FileList | null) {
+		if(!fileList || !fileList.length) {
+			files = undefined;
+			dispatch('change', files);
+			return;
+		}
+
+		if(!multiple || !files) {
+			files = []
+		}
+		for(let i = 0; i < fileList.length; i++) {
+			const file = fileList.item(i);
+			if(file) files.push(file);
+		}
+		// Needs to be reset so the same file can be selected 
+		// multiple times in a row
+		input.value = ''
+
+		dispatchChange()
+	}
+
+	async function fileToBase64(file: File): Promise<string> {
+		return new Promise((resolve) => {
+			const reader = new FileReader();
+			reader.onloadend = () => {
+				resolve(reader.result as string);
+			};
+			reader.readAsDataURL(file);
+		})
+	}
+
+	function removeFile(index: number) {
+		if(!files) return;
+		files.splice(index, 1)
+		files = files.length ? files : undefined
+		dispatchChange()
+	}
+
+	async function dispatchChange() {
+		files = files
+
+		if(convertToBase64 && files) {
+			const promises = files.map(fileToBase64);
+			const b64s = await Promise.all(promises);
+			dispatch('change', b64s);
+		} else {
+			dispatch('change', files);
+		}
+	}
+</script>
+
+<button
+	class="relative center-center flex-col text-center font-medium text-gray-600 
+	border-2 border-dashed border-gray-400 hover:border-blue-500 
+	focus-within:border-blue-500 hover:bg-blue-50 focus-within:bg-blue-50 
+	duration-200 rounded-lg p-1 {c ?? ''}"
+>
+	{#if !hideIcon && !files}
+		<FileUp size={36} class="mb-2" />
+	{/if}
+	{#if files}
+		<div class="w-full max-h-full overflow-auto px-6">
+			<div class="text-center mb-2 px-2">Selected file{files.length > 1 ? 's' : ''}:</div>
+			<ul class="relative z-20 max-w-[250px] bg-white rounded-lg overflow-hidden mx-auto">
+				{#each files as {name}, i}
+					<li class="flex justify-between items-center font-normal text-sm
+					hover:bg-gray-300/20 duration-200 py-1 px-2 cursor-default">
+						<span class="pr-2 ellipsize">{name}</span>
+						<Button
+							size="xs"
+							color="red"
+							variant="border"
+							iconOnly
+							btnClasses="bg-transparent"
+							startIcon={{ icon: faTrash }}
+							on:click={() => removeFile(i)}
+						/>
+					</li>
+				{/each}
+			</ul>
+		</div>
+	{:else}
+		<slot>
+			<span>Drag and drop files</span>
+		</slot>
+	{/if}
+	<input
+		class="!absolute !inset-0 !z-10 !opacity-0 !cursor-pointer"
+		type="file"
+		title={files ? `${files.length} file${files.length > 1 ? 's' : ''} chosen` : 'No file chosen'}
+		bind:this={input}
+		on:change={({currentTarget}) => {onChange(currentTarget.files)}}
+		{accept}
+		{multiple}
+		{...$$restProps}
+	/>
+</button>
\ No newline at end of file
diff --git a/frontend/src/lib/components/common/index.ts b/frontend/src/lib/components/common/index.ts
index f0631c05d1..c5656dcff4 100644
--- a/frontend/src/lib/components/common/index.ts
+++ b/frontend/src/lib/components/common/index.ts
@@ -17,6 +17,7 @@ export { default as Tabs } from './tabs/Tabs.svelte'
 export { default as ToggleButton } from './toggleButton/ToggleButton.svelte'
 export { default as ToggleButtonGroup } from './toggleButton/ToggleButtonGroup.svelte'
 export { default as Breadcrumb } from './breadcrumb/Breadcrumb.svelte'
+export { default as FileInput } from './fileInput/FileInput.svelte'
 
 export * from './alert/model'
 export * from './badge/model'