🚸 chore: add code to display saved user settings from the cookies on the settings page (#461)

public/static/cookies.js

@@ -1,3 +1,62 @@
+/**
+ * This functions gets the saved cookies if it is present on the user's machine If it
+ * is available then it is parsed and converted to an object which is then used to
+ * retrieve the preferences that the user had selected previously and is then loaded
+ * and used for displaying the user provided settings by setting them as the selected
+ * options in the settings page.
+ *
+ * @function
+ * @param {string} cookie - It takes the client settings cookie as a string.
+ * @returns {void}
+ */
+function setClientSettingsOnPage(cookie) {
+  let cookie_value = cookie
+    .split(';')
+    .map((item) => item.split('='))
+    .reduce((acc, [_, v]) => (acc = JSON.parse(v)) && acc, {})
+
+  // Loop through all select tags and add their values to the cookie dictionary
+  document.querySelectorAll('select').forEach((select_tag) => {
+    switch (select_tag.name) {
+      case 'themes':
+        select_tag.value = cookie_value['theme']
+        break
+      case 'colorschemes':
+        select_tag.value = cookie_value['colorscheme']
+        break
+      case 'animations':
+        select_tag.value = cookie_value['animation']
+        break
+      case 'safe_search_levels':
+        select_tag.value = cookie_value['safe_search_level']
+        break
+    }
+  })
+  let engines = document.querySelectorAll('.engine')
+  let engines_cookie = cookie_value['engines']
+
+  if (engines_cookie.length === engines.length) {
+    document.querySelector('.select_all').checked = true
+    engines.forEach((engine_checkbox) => {
+      engine_checkbox.checked = true
+    })
+  } else {
+    engines.forEach((engines_checkbox) => {
+      engines_checkbox.checked = false
+    })
+    engines_cookie.forEach((engine_name) => {
+      engines.forEach((engine_checkbox) => {
+        if (
+          engine_checkbox.parentNode.parentNode.innerText.trim() ===
+          engine_name.trim()
+        ) {
+          engine_checkbox.checked = true
+        }
+      })
+    })
+  }
+}
+
 /**
  * This function is executed when any page on the website finishes loading and
  * this function retrieves the cookies if it is present on the user's machine.
@@ -16,9 +75,14 @@ document.addEventListener(
       let cookie = decodeURIComponent(document.cookie)
       // Set the value of the input field to the decoded cookie value if it is not empty
       // Otherwise, display a message indicating that no cookies have been saved on the user's system
-      document.querySelector('.cookies input').value = cookie.length
-        ? cookie
-        : 'No cookies have been saved on your system'
+      if (cookie.length) {
+        document.querySelector('.cookies input').value = cookie
+        // This function displays the user provided settings on the settings page.
+        setClientSettingsOnPage(cookie)
+      } else {
+        document.querySelector('.cookies input').value =
+          'No cookies have been saved on your system'
+      }
     } catch (error) {
       // If there is an error decoding the cookie, log the error to the console
       // and display an error message in the input field