fix: Expose cached PDF path to WebView to reduce loading delays

course/src/main/java/in/testpress/course/fragments/AIChatPdfFragment.kt

@@ -1,6 +1,7 @@
 package `in`.testpress.course.fragments
 
 import `in`.testpress.course.R
+import `in`.testpress.course.util.CachedPdfPathProvider
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
@@ -18,6 +19,7 @@ class AIChatPdfFragment : Fragment() {
     companion object {
         private const val ARG_CONTENT_ID = "contentId"
         private const val ARG_COURSE_ID = "courseId"
+        private const val ARG_PDF_PATH = "pdfPath"
     }
 
     override fun onCreateView(
@@ -47,6 +49,12 @@ class AIChatPdfFragment : Fragment() {
             putBoolean(IS_AUTHENTICATION_REQUIRED, true)
         }
 
+        webViewFragment.setListener(object : WebViewFragment.Listener {
+            override fun onWebViewInitializationSuccess() {
+                setupJavaScriptInterface(webViewFragment)
+            }
+        })
+
         childFragmentManager.beginTransaction()
             .replace(R.id.aiPdf_view_fragment, webViewFragment)
             .commit()
@@ -59,4 +67,17 @@ class AIChatPdfFragment : Fragment() {
             ?: throw IllegalStateException("Base URL not configured.")
         return "$baseUrl/courses/$courseId/contents/$contentId/?content_detail_v2=true"
     }
+
+    private fun setupJavaScriptInterface(webViewFragment: WebViewFragment) {
+        val pdfPath = requireArguments().getString(ARG_PDF_PATH, "")
+        webViewFragment.webView.settings.apply {
+            allowFileAccessFromFileURLs = true
+            allowUniversalAccessFromFileURLs = true
+        }
+
+        webViewFragment.addJavascriptInterface(
+            CachedPdfPathProvider(requireActivity(), pdfPath), 
+            "AndroidPdfCache"
+        )
+    }
 }

course/src/main/java/in/testpress/course/fragments/DocumentViewerFragment.kt

@@ -119,6 +119,7 @@ class DocumentViewerFragment : BaseContentDetailFragment(), PdfDownloadListener,
             val args = Bundle()
             args.putLong("contentId", contentId)
             args.putLong("courseId", content.courseId ?: -1L)
+            args.putString("pdfPath", pdfDownloadManager.getCachedPdfPath())
             aiChatFragment?.arguments = args
         }
 

course/src/main/java/in/testpress/course/util/CachedPdfPathProvider.kt

@@ -0,0 +1,22 @@
+package `in`.testpress.course.util
+
+import android.app.Activity
+import `in`.testpress.util.BaseJavaScriptInterface
+import android.webkit.JavascriptInterface
+import java.io.File
+
+class CachedPdfPathProvider(
+    activity: Activity,
+    private val pdfPath: String
+) : BaseJavaScriptInterface(activity) {
+
+    @JavascriptInterface
+    fun getCachedPDFPath(): String {
+        if (isPDFCached()) return "file://$pdfPath" else return ""
+    }
+
+    @JavascriptInterface
+    fun isPDFCached(): Boolean {
+        return !pdfPath.isEmpty() && File(pdfPath).exists()
+    }
+}

course/src/main/java/in/testpress/course/util/PDFDownloadManager.kt

@@ -73,6 +73,10 @@ open class PDFDownloadManager(
     fun get(): File {
         return fileEncryptAndDecryptUtil.decrypt()
     }
+
+    fun getCachedPdfPath(): String {
+        return if (isDownloaded()) get().absolutePath else ""
+    }
 }
 
 interface PdfDownloadListener {