From adf3ddfbe001fe2756df6c9468deabff047c19ca Mon Sep 17 00:00:00 2001
From: skjnldsv <skjnldsv@protonmail.com>
Date: Thu, 14 Nov 2024 20:15:30 +0100
Subject: [PATCH] fixup! feat(systemtags): add color support

Signed-off-by: skjnldsv <skjnldsv@protonmail.com>
---
 .../src/components/SystemTagPicker.vue        | 65 +++++++++++++++----
 apps/systemtags/src/utils/colorUtils.ts       | 41 ++++++++++++
 2 files changed, 93 insertions(+), 13 deletions(-)
 create mode 100644 apps/systemtags/src/utils/colorUtils.ts

diff --git a/apps/systemtags/src/components/SystemTagPicker.vue b/apps/systemtags/src/components/SystemTagPicker.vue
index 9f36dee598d07..c2596f145d3a7 100644
--- a/apps/systemtags/src/components/SystemTagPicker.vue
+++ b/apps/systemtags/src/components/SystemTagPicker.vue
@@ -36,7 +36,7 @@
 				<li v-for="tag in filteredTags"
 					:key="tag.id"
 					:data-cy-systemtags-picker-tag="tag.id"
-					:style="{'--color-primary-element': tag.color ? `#${tag.color}` : null}"
+					:style="tagListStyle(tag)"
 					class="systemtags-picker__tag">
 					<NcCheckboxRadioSwitch :checked="isChecked(tag)"
 						:disabled="!tag.canAssign"
@@ -48,14 +48,19 @@
 					</NcCheckboxRadioSwitch>
 
 					<!-- Color picker -->
-					<NcColorPicker v-slot="{ attrs }"
-						:data-cy-systemtags-picker-tag-color="tag.id"
-						:value="tag.color ? `#${tag.color}` : primaryColor"
+					<NcColorPicker :data-cy-systemtags-picker-tag-color="tag.id"
+						:value="`#${tag.color || primaryColor}`"
 						class="systemtags-picker__tag-color"
 						@update:value="onColorChange(tag, $event)">
-						<CircleIcon v-bind="attrs" :size="24" />
+						<NcButton :aria-label="t('systemtags', 'Change tag color')" type="primary">
+							<template #icon>
+								<PencilIcon />
+							</template>
+						</NcButton>
 					</NcColorPicker>
 				</li>
+
+				<!-- Create new tag -->
 				<li>
 					<NcButton v-if="canCreateTag"
 						:disabled="status === Status.CREATING_TAG"
@@ -118,7 +123,6 @@ import { defineComponent } from 'vue'
 import { emit } from '@nextcloud/event-bus'
 import { sanitize } from 'dompurify'
 import { showError, showInfo } from '@nextcloud/dialogs'
-import { getCapabilities } from '@nextcloud/capabilities'
 import { getLanguage, n, t } from '@nextcloud/l10n'
 import escapeHTML from 'escape-html'
 
@@ -131,16 +135,19 @@ import NcEmptyContent from '@nextcloud/vue/dist/Components/NcEmptyContent.js'
 import NcLoadingIcon from '@nextcloud/vue/dist/Components/NcLoadingIcon.js'
 import NcNoteCard from '@nextcloud/vue/dist/Components/NcNoteCard.js'
 import NcTextField from '@nextcloud/vue/dist/Components/NcTextField.js'
-import TagIcon from 'vue-material-design-icons/Tag.vue'
 import CheckIcon from 'vue-material-design-icons/CheckCircle.vue'
+import PencilIcon from 'vue-material-design-icons/Pencil.vue'
 import PlusIcon from 'vue-material-design-icons/Plus.vue'
-import CircleIcon from 'vue-material-design-icons/Circle.vue'
+import TagIcon from 'vue-material-design-icons/Tag.vue'
 
-import { getNodeSystemTags, setNodeSystemTags } from '../utils'
 import { createTag, fetchTag, fetchTags, getTagObjects, setTagObjects } from '../services/api'
+import { getNodeSystemTags, setNodeSystemTags } from '../utils'
+import { invertTextColor } from '../utils/colorUtils'
 import logger from '../services/logger'
 
-const primaryColor = getCapabilities()?.theming?.['color-element'] || '#00679e'
+const primaryColor = getComputedStyle(document.documentElement)
+	.getPropertyValue('--color-primary-element')
+	.replace('#', '') || '0069c3'
 
 type TagListCount = {
 	string: number
@@ -168,9 +175,9 @@ export default defineComponent({
 		NcLoadingIcon,
 		NcNoteCard,
 		NcTextField,
+		PencilIcon,
 		PlusIcon,
 		TagIcon,
-		CircleIcon,
 	},
 
 	props: {
@@ -351,7 +358,14 @@ export default defineComponent({
 		// Format & sanitize a tag chip for v-html tag rendering
 		formatTagChip(tag: TagWithId): string {
 			const chip = this.$refs.chip as NcChip
-			const chipHtml = chip.$el.outerHTML
+			const chipCloneEl = chip.$el.cloneNode(true) as HTMLElement
+			if (tag.color) {
+				const style = this.tagListStyle(tag)
+				Object.entries(style).forEach(([key, value]) => {
+					chipCloneEl.style.setProperty(key, value)
+				})
+			}
+			const chipHtml = chipCloneEl.outerHTML
 			return chipHtml.replace('%s', escapeHTML(sanitize(tag.displayName)))
 		},
 
@@ -506,6 +520,19 @@ export default defineComponent({
 			showInfo(t('systemtags', 'File tags modification canceled'))
 			this.$emit('close', null)
 		},
+
+		tagListStyle(tag: TagWithId): Record<string, string> {
+			return {
+				'--color-primary': `#${tag.color || primaryColor}`,
+				'--color-primary-text': this.primaryElementTextColor(tag.color || primaryColor),
+				'--color-primary-element': `#${tag.color || primaryColor}`,
+				'--color-primary-element-text': this.primaryElementTextColor(tag.color || primaryColor),
+			}
+		},
+
+		primaryElementTextColor(color: string): string {
+			return invertTextColor(color) ? '#000000' : '#ffffff'
+		},
 	},
 })
 </script>
@@ -554,11 +581,23 @@ export default defineComponent({
 	}
 
 	.systemtags-picker__tag-color {
-		margin-inline-start: var(--default-grid-baseline);
+		margin-inline-start: calc(var(--default-grid-baseline) * 2);
 		color: var(--color-primary-element);
 		width: var(--default-clickable-area);
 		height: var(--default-clickable-area);
 		display: flex;
+
+		button {
+			border-radius: 50%;
+			span {
+				display: none;
+			}
+
+			&:focus span,
+			&:hover span {
+				display: block;
+			}
+		}
 	}
 
 	.systemtags-picker__tag-create {
diff --git a/apps/systemtags/src/utils/colorUtils.ts b/apps/systemtags/src/utils/colorUtils.ts
new file mode 100644
index 0000000000000..dfe41217eff6b
--- /dev/null
+++ b/apps/systemtags/src/utils/colorUtils.ts
@@ -0,0 +1,41 @@
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+type rgb = {
+	red: number
+	green: number
+	blue: number
+}
+
+/**
+ * Convert hex color to RGB
+ */
+export function hexToRGB(hex: string): rgb {
+	const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex)
+	if (!result) {
+		throw new Error('Invalid color')
+	}
+
+	return {
+		red: parseInt(result[1], 16),
+		green: parseInt(result[2], 16),
+		blue: parseInt(result[3], 16),
+	}
+}
+
+/**
+ * Calculate luminance of provided hex color
+ */
+export function calculateLuma(color: string): number {
+	const rgb = hexToRGB(color)
+	return (0.2126 * rgb.red + 0.7152 * rgb.green + 0.0722 * rgb.blue) / 255
+}
+
+/**
+ * Do we need to invert the text if color is too bright?
+ */
+export function invertTextColor(color: string): boolean {
+	return calculateLuma(color) > 0.6
+}