From b42c635cdb5834909ed26a75881eb10d322b5429 Mon Sep 17 00:00:00 2001
From: Jannat Patel <pateljannat2308@gmail.com>
Date: Tue, 14 Jan 2025 17:41:46 +0530
Subject: [PATCH] refactor: improved performance and ui batch list

---
 frontend/src/pages/Batches.vue | 449 +++++++++++++++++----------------
 lms/lms/utils.py               |  57 ++++-
 2 files changed, 286 insertions(+), 220 deletions(-)

diff --git a/frontend/src/pages/Batches.vue b/frontend/src/pages/Batches.vue
index 935ddbf0..0023dd5f 100644
--- a/frontend/src/pages/Batches.vue
+++ b/frontend/src/pages/Batches.vue
@@ -1,256 +1,267 @@
 <template>
-	<div class="">
-		<header
-			class="sticky top-0 z-10 flex items-center justify-between border-b bg-white px-3 py-2.5 sm:px-5"
+	<header
+		class="sticky flex items-center justify-between top-0 z-10 border-b bg-white px-3 py-2.5 sm:px-5"
+	>
+		<Breadcrumbs :items="breadcrumbs" />
+		<router-link
+			v-if="user.data?.is_moderator"
+			:to="{
+				name: 'BatchForm',
+				params: { batchName: 'new' },
+			}"
 		>
-			<Breadcrumbs
-				class="h-7"
-				:items="[{ label: __('Batches'), route: { name: 'Batches' } }]"
-			/>
-			<div class="flex space-x-2">
-				<div class="w-44">
+			<Button variant="solid">
+				<template #prefix>
+					<Plus class="h-4 w-4 stroke-1.5" />
+				</template>
+				{{ __('New') }}
+			</Button>
+		</router-link>
+	</header>
+	<div class="p-5 pb-10">
+		<div class="flex items-center justify-between mb-5">
+			<div class="text-lg font-semibold">
+				{{ __('All Batches') }}
+			</div>
+			<div class="flex items-center space-x-2">
+				<TabButtons
+					v-if="user.data && user.data?.is_student"
+					:buttons="batchTabs"
+					v-model="currentTab"
+				/>
+				<FormControl
+					v-model="title"
+					:placeholder="__('Search by Title')"
+					type="text"
+					@input="updateBatches()"
+				/>
+				<div v-if="user.data && !user.data?.is_student" class="w-44">
 					<Select
-						v-if="categories.data?.length"
-						v-model="currentCategory"
-						:options="categories.data"
-						:placeholder="__('Category')"
+						v-model="currentDuration"
+						:options="batchType"
+						:placeholder="__('Type')"
+						@change="updateBatches()"
 					/>
 				</div>
-				<router-link
-					v-if="user.data?.is_moderator"
-					:to="{
-						name: 'BatchForm',
-						params: { batchName: 'new' },
-					}"
-				>
-					<Button variant="solid">
-						<template #prefix>
-							<Plus class="h-4 w-4 stroke-1.5" />
-						</template>
-						{{ __('New') }}
-					</Button>
-				</router-link>
-			</div>
-		</header>
-		<div v-if="batches.data" class="pb-5">
-			<div
-				v-if="batches.data.length == 0 && batches.list.loading"
-				class="p-5 text-base text-gray-700"
-			>
-				{{ __('Loading Batches...') }}
-			</div>
-			<Tabs
-				v-if="hasBatches"
-				v-model="tabIndex"
-				:tabs="makeTabs"
-				tablistClass="overflow-x-visible flex-wrap !gap-3 md:flex-nowrap"
-			>
-				<template #tab="{ tab, selected }">
-					<div>
-						<button
-							class="group -mb-px flex items-center gap-2 border-b border-transparent py-2.5 text-base text-gray-600 duration-300 ease-in-out hover:border-gray-400 hover:text-gray-900"
-							:class="{ 'text-gray-900': selected }"
-						>
-							<component v-if="tab.icon" :is="tab.icon" class="h-5" />
-							{{ __(tab.label) }}
-							<Badge
-								:class="
-									selected
-										? 'text-gray-800 border border-gray-800'
-										: 'border border-gray-500'
-								"
-								variant="subtle"
-								theme="gray"
-								size="sm"
-							>
-								{{ tab.count }}
-							</Badge>
-						</button>
-					</div>
-				</template>
-				<template #default="{ tab }">
-					<div
-						v-if="tab.batches && tab.batches.value.length"
-						class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-5 m-5"
-					>
-						<router-link
-							v-for="batch in tab.batches.value"
-							:to="{ name: 'BatchDetail', params: { batchName: batch.name } }"
-						>
-							<BatchCard :batch="batch" />
-						</router-link>
-					</div>
-					<div v-else class="p-5 italic text-gray-500">
-						{{ __('No {0} batches').format(tab.label.toLowerCase()) }}
-					</div>
-				</template>
-			</Tabs>
-			<div
-				v-else-if="
-					!batches.loading &&
-					!hasBatches &&
-					(user.data?.is_instructor || user.data?.is_moderator)
-				"
-				class="grid grid-cols-3 p-5"
-			>
-				<router-link
-					:to="{
-						name: 'BatchForm',
-						params: {
-							batchName: 'new',
-						},
-					}"
-				>
-					<div class="bg-gray-50 py-32 px-5 rounded-md">
-						<div class="flex flex-col items-center text-center space-y-2">
-							<Plus
-								class="size-10 stroke-1 text-gray-800 p-1 rounded-full border bg-white"
-							/>
-							<div class="font-medium">
-								{{ __('Create a Batch') }}
-							</div>
-							<span class="text-gray-700 text-sm leading-4">
-								{{ __('You can link courses and assessments to it.') }}
-							</span>
-						</div>
-					</div>
-				</router-link>
-			</div>
-			<div
-				v-else-if="!batches.loading && !hasBatches"
-				class="text-center p-5 text-gray-600 mt-52 w-3/4 md:w-1/2 mx-auto space-y-2"
-			>
-				<BookOpen class="size-10 mx-auto stroke-1 text-gray-500" />
-				<div class="text-xl font-medium">
-					{{ __('No batches found') }}
-				</div>
-				<div>
-					{{
-						__(
-							'There are no batches available at the moment. Keep an eye out, fresh learning experiences are on the way soon!'
-						)
-					}}
+				<div class="w-44">
+					<Select
+						v-if="categories.length"
+						v-model="currentCategory"
+						:options="categories"
+						:placeholder="__('Category')"
+						@change="updateBatches()"
+					/>
 				</div>
 			</div>
 		</div>
+		<div v-if="batches.data?.length" class="grid grid-cols-4 gap-5">
+			<router-link
+				v-for="batch in batches.data"
+				:to="{ name: 'BatchDetail', params: { batchName: batch.name } }"
+			>
+				<BatchCard :batch="batch" />
+			</router-link>
+		</div>
+		<div
+			v-else
+			class="flex flex-col items-center justify-center text-sm text-gray-600 italic mt-48"
+		>
+			<BookOpen class="size-10 mx-auto stroke-1.5 text-gray-500" />
+			<div class="text-xl font-medium mb-2">
+				{{ __('No batches found') }}
+			</div>
+			<div class="leading-5 w-2/5 text-center">
+				{{
+					__(
+						'There are no batches matching the criteria. Keep an eye out, fresh learning experiences are on the way soon!'
+					)
+				}}
+			</div>
+		</div>
+		<div
+			v-if="!batches.loading && batches.hasNextPage"
+			class="flex justify-center mt-5"
+		>
+			<Button @click="batches.next()">
+				{{ __('Load More') }}
+			</Button>
+		</div>
 	</div>
 </template>
 <script setup>
 import {
-	createResource,
 	Breadcrumbs,
 	Button,
-	Tabs,
-	Badge,
+	createListResource,
+	FormControl,
 	Select,
+	TabButtons,
 } from 'frappe-ui'
+import { computed, inject, onMounted, ref, watch } from 'vue'
 import { BookOpen, Plus } from 'lucide-vue-next'
 import BatchCard from '@/components/BatchCard.vue'
-import { inject, ref, computed, onMounted, watch } from 'vue'
-import { updateDocumentTitle } from '@/utils'
 
 const user = inject('$user')
+const dayjs = inject('$dayjs')
+const start = ref(0)
+const pageLength = ref(20)
+const categories = ref([])
 const currentCategory = ref(null)
-const hasBatches = ref(false)
+const title = ref('')
+const filters = ref({})
+const currentDuration = ref(null)
+const currentTab = ref('All')
 
 onMounted(() => {
-	let queries = new URLSearchParams(location.search)
-	if (queries.has('category')) {
-		currentCategory.value = queries.get('category')
-	}
-})
-
-const batches = createResource({
-	doctype: 'LMS Batch',
-	url: 'lms.lms.utils.get_batches',
-	cache: ['batches', user.data?.email || ''],
-	auto: true,
-})
-
-const categories = createResource({
-	url: 'lms.lms.api.get_categories',
-	makeParams() {
-		return {
-			doctype: 'LMS Batch',
-			filters: {
-				published: 1,
-			},
-		}
-	},
-	cache: ['batchCategories'],
-	auto: true,
-	transform(data) {
-		data.unshift({
+	setFiltersFromQuery()
+	updateBatches()
+	categories.value = [
+		{
 			label: '',
 			value: null,
-		})
+		},
+	]
+})
+
+const setFiltersFromQuery = () => {
+	let queries = new URLSearchParams(location.search)
+	title.value = queries.get('title') || ''
+	currentCategory.value = queries.get('category') || null
+	currentDuration.value = queries.get('type') || null
+}
+
+const batches = createListResource({
+	doctype: 'LMS Batch',
+	url: 'lms.lms.utils.get_batches',
+	cache: ['batches', user.data?.name],
+	pageLength: pageLength.value,
+	start: start.value,
+	onSuccess(data) {
+		let allCategories = data.map((batch) => batch.category)
+		allCategories = allCategories.filter(
+			(category, index) => allCategories.indexOf(category) === index && category
+		)
+		if (categories.value.length <= allCategories.length) {
+			updateCategories(data)
+		}
 	},
 })
 
-const tabIndex = ref(0)
-let tabs
+const updateBatches = () => {
+	updateFilters()
+	batches.update({
+		filters: filters.value,
+	})
+	batches.reload()
+}
 
-const makeTabs = computed(() => {
-	tabs = []
-	addToTabs('Upcoming')
+const updateFilters = () => {
+	if (currentCategory.value) {
+		filters.value['category'] = currentCategory.value
+	} else {
+		delete filters.value['category']
+	}
 
+	if (title.value) {
+		filters.value['title'] = ['like', `%${title.value}%`]
+	} else {
+		delete filters.value['title']
+	}
+
+	if (currentDuration.value) {
+		delete filters.value['start_date']
+		delete filters.value['published']
+
+		if (currentDuration.value == 'Upcoming') {
+			filters.value['start_date'] = ['>=', dayjs().format('YYYY-MM-DD')]
+		} else if (currentDuration.value == 'Archived') {
+			filters.value['start_date'] = ['<', dayjs().format('YYYY-MM-DD')]
+		} else if (currentDuration.value == 'Unpublished') {
+			filters.value['published'] = 0
+		}
+	} else {
+		delete filters.value['start_date']
+		delete filters.value['published']
+	}
+
+	if (currentTab.value == 'Enrolled' && user.data?.is_student) {
+		filters.value['enrolled'] = 1
+	} else {
+		delete filters.value['enrolled']
+	}
+
+	if (!user.data || user.data?.is_student) {
+		filters.value['start_date'] = ['>=', dayjs().format('YYYY-MM-DD')]
+		filters.value['published'] = 1
+	}
+
+	setQueryParams()
+}
+
+const setQueryParams = () => {
+	let queries = new URLSearchParams(location.search)
+	let filterKeys = {
+		title: title.value,
+		category: currentCategory.value,
+		type: currentDuration.value,
+	}
+
+	Object.keys(filterKeys).forEach((key) => {
+		if (filterKeys[key]) {
+			queries.set(key, filterKeys[key])
+		} else {
+			queries.delete(key)
+		}
+	})
+
+	history.replaceState({}, '', `${location.pathname}?${queries.toString()}`)
+}
+
+const updateCategories = (data) => {
+	data.forEach((batch) => {
+		if (
+			batch.category &&
+			!categories.value.find((category) => category.value === batch.category)
+		)
+			categories.value.push({
+				label: batch.category,
+				value: batch.category,
+			})
+	})
+}
+
+watch(currentTab, () => {
+	updateBatches()
+})
+
+const batchType = computed(() => {
+	let types = [
+		{ label: __(''), value: null },
+		{ label: __('Upcoming'), value: 'Upcoming' },
+		{ label: __('Archived'), value: 'Archived' },
+	]
 	if (user.data?.is_moderator) {
-		addToTabs('Archived')
-		addToTabs('Private')
-	}
-
-	if (user.data) {
-		addToTabs('Enrolled')
+		types.push({ label: __('Unpublished'), value: 'Unpublished' })
 	}
+	return types
+})
 
+const batchTabs = computed(() => {
+	let tabs = [
+		{
+			label: __('All'),
+		},
+		{
+			label: __('Enrolled'),
+		},
+	]
 	return tabs
 })
 
-const getBatches = (type) => {
-	if (currentCategory.value && currentCategory.value != '') {
-		return batches.data[type].filter(
-			(batch) => batch.category == currentCategory.value
-		)
-	}
-	return batches.data[type]
-}
-
-const addToTabs = (label) => {
-	let batches = getBatches(label.toLowerCase().split(' ').join('_'))
-	tabs.push({
-		label,
-		batches: computed(() => batches),
-		count: computed(() => batches.length),
-	})
-}
-
-watch(batches, () => {
-	Object.keys(batches.data).forEach((key) => {
-		if (batches.data[key].length) {
-			hasBatches.value = true
-		}
-	})
-})
-
-watch(
-	() => currentCategory.value,
-	() => {
-		let queries = new URLSearchParams(location.search)
-		if (currentCategory.value) {
-			queries.set('category', currentCategory.value)
-		} else {
-			queries.delete('category')
-		}
-		history.pushState(null, '', `${location.pathname}?${queries.toString()}`)
-	}
-)
-
-const pageMeta = computed(() => {
-	return {
-		title: 'Batches',
-		description: 'All batches divided by categories',
-	}
-})
-
-updateDocumentTitle(pageMeta)
+const breadcrumbs = computed(() => [
+	{
+		label: __('Batches'),
+		route: { name: 'Batches' },
+	},
+])
 </script>
diff --git a/lms/lms/utils.py b/lms/lms/utils.py
index 8aa3a1ff..0f2eccd2 100644
--- a/lms/lms/utils.py
+++ b/lms/lms/utils.py
@@ -1211,7 +1211,7 @@ def get_neighbour_lesson(course, chapter, lesson):
 
 
 @frappe.whitelist(allow_guest=True)
-def get_batches():
+def get_batches1():
 	batches = []
 	filters = {}
 	if frappe.session.user == "Guest":
@@ -1902,3 +1902,58 @@ def enroll_in_program_course(program, course):
 	)
 	enrollment.save()
 	return enrollment
+
+
+@frappe.whitelist(allow_guest=True)
+def get_batches(filters=None, start=0, page_length=20):
+	if not filters:
+		filters = {}
+
+	if filters.get("enrolled"):
+		enrolled_batches = frappe.get_all(
+			"Batch Student", {"student": frappe.session.user}, pluck="parent"
+		)
+		filters.update({"name": ["in", enrolled_batches]})
+		del filters["enrolled"]
+		del filters["published"]
+		del filters["start_date"]
+
+	batches = frappe.get_all(
+		"LMS Batch",
+		filters=filters,
+		fields=[
+			"name",
+			"title",
+			"description",
+			"seat_count",
+			"paid_batch",
+			"amount",
+			"amount_usd",
+			"currency",
+			"start_date",
+			"end_date",
+			"start_time",
+			"end_time",
+			"timezone",
+			"published",
+			"category",
+		],
+		order_by="start_date desc",
+		start=start,
+		page_length=page_length,
+	)
+
+	for batch in batches:
+		batch.instructors = get_instructors(batch.name)
+		students_count = frappe.db.count("Batch Student", {"parent": batch.name})
+
+		if batch.seat_count:
+			batch.seats_left = batch.seat_count - students_count
+
+		if batch.paid_batch and batch.start_date >= getdate():
+			batch.amount, batch.currency = check_multicurrency(
+				batch.amount, batch.currency, None, batch.amount_usd
+			)
+			batch.price = fmt_money(batch.amount, 0, batch.currency)
+
+	return batches