From 7c14028b68f3e85daff2bc0e9b94ce9e33d46cd2 Mon Sep 17 00:00:00 2001
From: acestronautical <acestronautical@protonmail.com>
Date: Fri, 9 Feb 2024 12:47:54 -0800
Subject: [PATCH] Refactor createpages

---
 src/book.js | 66 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 37 insertions(+), 29 deletions(-)

diff --git a/src/book.js b/src/book.js
index b0e6bc7..f2e9404 100644
--- a/src/book.js
+++ b/src/book.js
@@ -157,42 +157,50 @@ export class Book {
     let pages;
     [this.managedDoc, pages] = await this.embedPagesInNewPdf(this.currentdoc);
 
-    for (var i = 0; i < pages.length; ++i) {
-      var page = pages[i];
-      var newPage = this.managedDoc.addPage();
-      var rotate90cw =
-        this.source_rotation == '90cw' ||
-        (this.source_rotation == 'out_binding' && i % 2 == 0) ||
-        (this.source_rotation == 'in_binding' && i % 2 == 1);
-      var rotate90ccw =
-        this.source_rotation == '90ccw' ||
-        (this.source_rotation == 'out_binding' && i % 2 == 1) ||
-        (this.source_rotation == 'in_binding' && i % 2 == 0);
-      if (this.source_rotation == 'none') {
-        newPage.setSize(page.width, page.height);
-        newPage.drawPage(page);
-      } else if (rotate90ccw) {
-        newPage.setSize(page.height, page.width);
-        newPage.drawPage(page, {
-          x: page.height,
-          y: 0,
-          rotate: degrees(90),
-        });
-      } else if (rotate90cw) {
+    pages.forEach((page, i) => {
+      const newPage = this.managedDoc.addPage();
+      let rotateAngle = null;
+      const evenPage = i % 2 === 0;
+
+      // Determine rotation angle
+      switch (this.source_rotation) {
+        case 'none':
+          rotateAngle = 0;
+          break;
+        case '90cw':
+          rotateAngle = -90;
+          break;
+        case '90ccw':
+          rotateAngle = 90;
+          break;
+        case 'out_binding':
+          rotateAngle = evenPage ? -90 : 90;
+          break;
+        case 'in_binding':
+          rotateAngle = evenPage ? 90 : -90;
+          break;
+        default:
+          var e = new Error('Invalid source rotation');
+          console.error(e);
+          throw e;
+      }
+
+      // Apply rotation to the new page
+      if (rotateAngle !== 0) {
         newPage.setSize(page.height, page.width);
         newPage.drawPage(page, {
-          x: 0,
-          y: page.width,
-          rotate: degrees(-90),
+          x: rotateAngle === 90 ? page.height : 0,
+          y: rotateAngle === -90 ? page.width : 0,
+          rotate: degrees(rotateAngle),
         });
       } else {
-        var e = new Error("??? what sorta' layout you think you're going to get?");
-        console.error(e);
-        throw e;
+        newPage.setSize(page.width, page.height);
+        newPage.drawPage(page);
       }
+
       page.embed();
       this.cropbox = newPage.getCropBox();
-    }
+    });
 
     console.log(
       'The updatedDoc doc has : ',