feat: Customer Ratings & Reviews Full Page

- Created macros for repetitive snippets
- Created Customer Reviews full page
- View more button to reveal 10 more reviews at a time
- Common function to get reviews with start and end
diff --git a/erpnext/templates/pages/customer_reviews.js b/erpnext/templates/pages/customer_reviews.js
new file mode 100644
index 0000000..453b96a
--- /dev/null
+++ b/erpnext/templates/pages/customer_reviews.js
@@ -0,0 +1,135 @@
+$(() => {
+	class CustomerReviews {
+		constructor() {
+			this.bind_button_actions();
+			this.start = 0;
+			this.page_length = 10;
+		}
+
+		bind_button_actions() {
+			this.write_review();
+			this.view_more();
+		}
+
+		write_review() {
+			//TODO: make dialog popup on stray page
+			$('.page_content').on('click', '.btn-write-review', (e) => {
+				// Bind action on write a review button
+				const $btn = $(e.currentTarget);
+
+				let d = new frappe.ui.Dialog({
+					title: __("Write a Review"),
+					fields: [
+						{fieldname: "title", fieldtype: "Data", label: "Headline", reqd: 1},
+						{fieldname: "rating", fieldtype: "Rating", label: "Overall Rating", reqd: 1},
+						{fieldtype: "Section Break"},
+						{fieldname: "comment", fieldtype: "Small Text", label: "Your Review"}
+					],
+					primary_action: function() {
+						let me = this;
+						let data = d.get_values();
+						frappe.call({
+							method: "erpnext.e_commerce.doctype.item_review.item_review.add_item_review",
+							args: {
+								web_item: $btn.attr('data-web-item'),
+								title: data.title,
+								rating: data.rating,
+								comment: data.comment
+							},
+							freeze: true,
+							freeze_message: __("Submitting Review ..."),
+							callback: (r) => {
+								if(!r.exc) {
+									frappe.msgprint({
+										message: __("Thank you for submitting your review"),
+										title: __("Review Submitted"),
+										indicator: "green"
+									});
+									d.hide();
+									location.reload();
+								}
+							}
+						});
+					},
+					primary_action_label: __('Submit')
+				});
+				d.show();
+			});
+		}
+
+		view_more() {
+			$('.page_content').on('click', '.btn-view-more', (e) => {
+				// Bind action on view more button
+				const $btn = $(e.currentTarget);
+				$btn.prop('disabled', true);
+
+				this.start += this.page_length;
+				let me = this;
+
+				frappe.call({
+					method: "erpnext.e_commerce.doctype.item_review.item_review.get_item_reviews",
+					args: {
+						web_item: $btn.attr('data-web-item'),
+						start: me.start,
+						end: me.page_length
+					},
+					callback: (result) => {
+						if(result.message) {
+							let res = result.message;
+							me.get_user_review_html(res.reviews);
+
+							$btn.prop('disabled', false);
+							if (res.total_reviews <= (me.start + me.page_length)) {
+								$btn.hide();
+							}
+
+						}
+					}
+				})
+			});
+
+		}
+
+		get_user_review_html(reviews) {
+			let me = this;
+			let $content = $('.user-reviews');
+
+			reviews.forEach((review) => {
+				$content.append(`
+					<div class="mb-3 review">
+						<div style="display: flex;">
+							<div class="rating">
+								${me.get_review_stars(review.rating)}
+							</div>
+							<p class="ml-4 user-review-title">
+								<span>${__(review.review_title)}</span>
+							</p>
+						</div>
+						<div class="review-signature">
+							<span class="reviewer">${__(review.customer)}</span>
+							<span>${__(review.published_on)}</span>
+						</div>
+						<div class="product-description mb-4 mt-4">
+							<p>
+								${__(review.comment)}
+							</p>
+						</div>
+					</div>
+				`);
+			});
+		}
+
+		get_review_stars(rating) {
+			let stars = ``;
+			for(let i = 1; i < 6; i++) {
+				let fill_class = i <= rating ? 'star-click' : '';
+				stars += `<svg class="icon icon-md ${fill_class}">
+						<use href="#icon-star"></use>
+					</svg>`;
+			}
+			return stars;
+		}
+	}
+
+	new CustomerReviews();
+});
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