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+package com.codex.webviewgrammar
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+
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+import android.media.AudioAttributes
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+import android.media.MediaDataSource
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+import android.media.MediaPlayer
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+import android.net.Uri
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+import android.os.Bundle
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+import android.util.Base64
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+import android.view.inputmethod.EditorInfo
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+import android.webkit.WebChromeClient
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+import android.webkit.WebSettings
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+import android.webkit.WebView
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+import android.webkit.WebViewClient
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+import android.widget.Toast
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+import androidx.appcompat.app.AppCompatActivity
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+import androidx.core.view.isVisible
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+import androidx.lifecycle.lifecycleScope
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+import com.codex.webviewgrammar.databinding.ActivityMainBinding
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+import com.google.android.material.dialog.MaterialAlertDialogBuilder
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+import kotlinx.coroutines.Dispatchers
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+import kotlinx.coroutines.launch
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+import kotlinx.coroutines.suspendCancellableCoroutine
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+import kotlinx.coroutines.withContext
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+import okhttp3.MediaType.Companion.toMediaType
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+import okhttp3.OkHttpClient
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+import okhttp3.Request
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+import okhttp3.RequestBody.Companion.toRequestBody
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+import org.json.JSONArray
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+import org.json.JSONException
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+import org.json.JSONObject
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+import java.io.IOException
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+import java.util.ArrayDeque
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+import java.util.concurrent.TimeUnit
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+import kotlin.coroutines.resume
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+
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+class MainActivity : AppCompatActivity() {
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+
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+ private lateinit var binding: ActivityMainBinding
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+ private val okHttpClient: OkHttpClient by lazy {
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+ OkHttpClient.Builder()
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+ .callTimeout(60, TimeUnit.SECONDS)
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+ .connectTimeout(30, TimeUnit.SECONDS)
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+ .readTimeout(60, TimeUnit.SECONDS)
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+ .build()
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+ }
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+ private val ttsChunks: ArrayDeque<ByteArray> = ArrayDeque()
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+ private var mediaPlayer: MediaPlayer? = null
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+ private var mediaDataSource: MediaDataSource? = null
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+ private var isTtsStreaming = false
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+
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+ override fun onCreate(savedInstanceState: Bundle?) {
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+ super.onCreate(savedInstanceState)
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+ binding = ActivityMainBinding.inflate(layoutInflater)
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+ setContentView(binding.root)
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+ setSupportActionBar(binding.toolbar)
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+ setupWebView()
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+ setupInteractions()
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+ val homeUrl = getString(R.string.default_home_url)
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+ binding.urlInput.setText(homeUrl)
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+ loadUrl(homeUrl)
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+ }
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+
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+ override fun onDestroy() {
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+ super.onDestroy()
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+ clearTtsResources()
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+ binding.webview.destroy()
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+ }
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+
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+ private fun setupInteractions() {
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+ binding.loadButton.setOnClickListener { loadUrlFromInput() }
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+ binding.urlInput.setOnEditorActionListener { _, actionId, _ ->
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+ if (actionId == EditorInfo.IME_ACTION_GO) {
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+ loadUrlFromInput()
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+ true
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+ } else {
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+ false
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+ }
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+ }
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+ binding.highlightButton.setOnClickListener { triggerHighlight() }
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+ binding.ttsButton.setOnClickListener { triggerTts() }
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+ }
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+
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+ private fun setupWebView() {
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+ binding.pageProgress.isIndeterminate = true
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+ val settings = binding.webview.settings
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+ settings.javaScriptEnabled = true
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+ settings.domStorageEnabled = true
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+ settings.mixedContentMode = WebSettings.MIXED_CONTENT_COMPATIBILITY_MODE
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+ settings.loadWithOverviewMode = true
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+ settings.useWideViewPort = true
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+ binding.webview.webChromeClient = object : WebChromeClient() {
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+ override fun onProgressChanged(view: WebView?, newProgress: Int) {
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+ binding.pageProgress.isVisible = newProgress in 1 until 100
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+ super.onProgressChanged(view, newProgress)
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+ }
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+ }
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+ binding.webview.webViewClient = object : WebViewClient() {
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+ override fun onPageStarted(view: WebView?, url: String?, favicon: android.graphics.Bitmap?) {
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+ super.onPageStarted(view, url, favicon)
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+ setActionButtonsEnabled(false)
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+ binding.statusText.text = getString(R.string.status_loading)
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+ }
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+
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+ override fun onPageFinished(view: WebView?, url: String?) {
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+ super.onPageFinished(view, url)
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+ setActionButtonsEnabled(true)
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+ binding.statusText.text = getString(R.string.status_ready)
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+ }
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+
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+ override fun onReceivedError(
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+ view: WebView?,
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+ request: android.webkit.WebResourceRequest?,
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+ error: android.webkit.WebResourceError?
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+ ) {
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+ super.onReceivedError(view, request, error)
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+ setActionButtonsEnabled(false)
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+ binding.statusText.text = error?.description?.toString() ?: getString(R.string.error_invalid_url)
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+ }
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+ }
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+ }
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+
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+ private fun loadUrlFromInput() {
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+ val input = binding.urlInput.text?.toString().orEmpty().trim()
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+ if (input.isEmpty()) {
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+ Toast.makeText(this, R.string.error_invalid_url, Toast.LENGTH_SHORT).show()
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+ return
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+ }
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+ val uri = ensureScheme(input)
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+ loadUrl(uri.toString())
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+ }
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+
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+ private fun ensureScheme(candidate: String): Uri {
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+ val parsed = Uri.parse(candidate)
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+ return if (parsed.scheme.isNullOrEmpty()) {
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+ Uri.parse("https://$candidate")
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+ } else {
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+ parsed
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+ }
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+ }
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+
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+ private fun loadUrl(url: String) {
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+ binding.webview.loadUrl(url)
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+ }
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+
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+ private fun triggerHighlight() {
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+ lifecycleScope.launch {
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+ val pageText = captureCurrentPageText()
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+ if (pageText.isBlank()) {
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+ binding.statusText.text = getString(R.string.error_empty_page)
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+ return@launch
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+ }
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+ binding.statusText.text = getString(R.string.status_highlight_progress)
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+ setActionButtonsEnabled(false)
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+ val result = runCatching { requestHighlight(pageText) }
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+ setActionButtonsEnabled(true)
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+ result.onSuccess { html ->
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+ binding.statusText.text = getString(R.string.status_ready)
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+ showHighlightDialog(html)
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+ }.onFailure { err ->
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+ binding.statusText.text = getString(R.string.error_highlight_failed, err.message ?: "")
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+ }
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+ }
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+ }
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+
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+ private fun triggerTts() {
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+ lifecycleScope.launch {
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+ val pageText = captureCurrentPageText()
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+ if (pageText.isBlank()) {
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+ binding.statusText.text = getString(R.string.error_empty_page)
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+ return@launch
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+ }
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+ binding.statusText.text = getString(R.string.status_tts_progress)
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+ setActionButtonsEnabled(false)
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+ resetTtsPlayback()
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+ isTtsStreaming = true
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+ val result = runCatching { streamTts(pageText) }
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+ isTtsStreaming = false
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+ setActionButtonsEnabled(true)
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+ result.onFailure { err ->
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+ binding.statusText.text = getString(R.string.error_tts_failed, err.message ?: "")
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+ resetTtsPlayback()
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+ }.onSuccess {
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+ if (ttsChunks.isEmpty()) {
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+ binding.statusText.text = getString(R.string.error_tts_failed, getString(R.string.error_empty_page))
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+ } else {
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+ binding.statusText.text = getString(R.string.status_tts_playing)
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+ }
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+ }
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+ }
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+ }
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+
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+ private suspend fun captureCurrentPageText(): String {
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+ val script = """(function() { try { var root = document.body; if (!root) return ''; return root.innerText || root.textContent || ''; } catch (e) { return ''; } })();"""
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+ val raw = evaluateJavascript(script)
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+ return decodeJsResult(raw).trim()
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+ }
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+
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+ private suspend fun evaluateJavascript(script: String): String? = suspendCancellableCoroutine { cont ->
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+ binding.webview.evaluateJavascript(script) { value ->
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+ if (!cont.isCompleted) {
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+ cont.resume(value)
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+ }
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+ }
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+ }
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+
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+ private fun decodeJsResult(raw: String?): String {
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+ if (raw.isNullOrBlank() || raw == "null") return ""
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+ return try {
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+ JSONArray("[$raw]").getString(0)
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+ } catch (_: JSONException) {
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+ raw.replace("\"", "")
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+ }
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+ }
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+
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+ private suspend fun requestHighlight(text: String): String = withContext(Dispatchers.IO) {
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+ val payload = JSONObject().put("text", text).toString()
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+ val body = payload.toRequestBody("application/json; charset=utf-8".toMediaType())
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+ val api = BuildConfig.GRAMMAR_API_BASE_URL.trimEnd('/') + "/analyze"
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+ val request = Request.Builder()
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+ .url(api)
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+ .post(body)
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+ .build()
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+ okHttpClient.newCall(request).execute().use { response ->
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+ if (!response.isSuccessful) {
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+ throw IOException("HTTP ${'$'}{response.code}")
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+ }
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+ val responseBody = response.body?.string() ?: throw IOException("Empty response")
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+ val json = JSONObject(responseBody)
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+ json.getString("highlighted_html")
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+ }
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+ }
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+
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+ private suspend fun streamTts(text: String) = withContext(Dispatchers.IO) {
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+ val payload = JSONObject().put("text", text).toString()
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+ val body = payload.toRequestBody("application/json; charset=utf-8".toMediaType())
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+ val request = Request.Builder()
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+ .url(BuildConfig.TTS_ENDPOINT)
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+ .post(body)
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+ .build()
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+ okHttpClient.newCall(request).execute().use { response ->
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+ if (!response.isSuccessful) {
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+ throw IOException("HTTP ${'$'}{response.code}")
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+ }
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+ val responseBody = response.body ?: throw IOException("Empty response")
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+ val source = responseBody.source()
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+ while (true) {
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+ val line = source.readUtf8Line() ?: break
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+ val chunk = parseTtsLine(line) ?: continue
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+ withContext(Dispatchers.Main) {
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+ enqueueChunk(chunk)
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+ }
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+ }
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+ }
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+ }
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+
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+ private fun parseTtsLine(raw: String?): ByteArray? {
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+ if (raw.isNullOrBlank()) return null
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+ var normalized = raw.trim()
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+ if (normalized.startsWith("data:", ignoreCase = true)) {
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+ normalized = normalized.substringAfter(":").trim()
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+ }
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+ if (normalized.isEmpty() || normalized == "[DONE]") {
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+ return null
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+ }
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+ return try {
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+ val json = JSONObject(normalized)
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+ val audio = json.optString("audio")
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+ if (audio.isNullOrBlank()) {
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+ null
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+ } else {
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+ Base64.decode(audio, Base64.DEFAULT)
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+ }
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+ } catch (_: JSONException) {
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+ null
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+ }
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+ }
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+
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+ private fun enqueueChunk(chunk: ByteArray) {
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+ ttsChunks.addLast(chunk)
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+ if (mediaPlayer == null) {
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+ playNextChunk()
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+ }
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+ }
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+
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+ private fun playNextChunk() {
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+ if (ttsChunks.isEmpty()) {
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+ if (!isTtsStreaming) {
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+ binding.statusText.text = getString(R.string.status_tts_finished)
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+ }
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+ releasePlayer()
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+ return
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+ }
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+ val chunk = ttsChunks.removeFirst()
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+ releasePlayer()
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+ val player = MediaPlayer()
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+ val dataSource = ByteArrayMediaDataSource(chunk)
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+ mediaDataSource = dataSource
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+ player.setAudioAttributes(
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+ AudioAttributes.Builder()
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+ .setUsage(AudioAttributes.USAGE_MEDIA)
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+ .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
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+ .build()
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+ )
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+ player.setDataSource(dataSource)
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+ player.setOnCompletionListener { playNextChunk() }
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+ player.setOnErrorListener { _, _, _ ->
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+ playNextChunk()
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+ true
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+ }
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+ player.prepare()
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+ player.start()
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+ mediaPlayer = player
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+ binding.statusText.text = getString(R.string.status_tts_playing)
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+ }
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+
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+ private fun resetTtsPlayback() {
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+ ttsChunks.clear()
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+ releasePlayer()
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+ }
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+
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+ private fun releasePlayer() {
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+ mediaPlayer?.let {
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+ runCatching { it.stop() }
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+ it.release()
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+ }
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+ mediaPlayer = null
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+ mediaDataSource?.close()
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+ mediaDataSource = null
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+ }
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+
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+ private fun clearTtsResources() {
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+ resetTtsPlayback()
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+ }
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+
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+ private fun setActionButtonsEnabled(enabled: Boolean) {
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+ binding.highlightButton.isEnabled = enabled
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+ binding.ttsButton.isEnabled = enabled
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+ }
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+
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+ private fun showHighlightDialog(html: String) {
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+ val dialogWebView = WebView(this).apply {
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+ settings.javaScriptEnabled = false
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+ settings.defaultTextEncodingName = "utf-8"
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+ loadDataWithBaseURL(null, html, "text/html", "utf-8", null)
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+ }
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+ MaterialAlertDialogBuilder(this)
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+ .setTitle(R.string.dialog_highlight_title)
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+ .setView(dialogWebView)
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+ .setPositiveButton(R.string.action_close, null)
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+ .show()
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+ }
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+
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+ private class ByteArrayMediaDataSource(private val data: ByteArray) : MediaDataSource() {
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+ override fun readAt(position: Long, buffer: ByteArray, offset: Int, size: Int): Int {
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+ if (position >= data.size) {
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+ return -1
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+ }
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+ val available = data.size - position.toInt()
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+ val length = minOf(available, size)
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+ System.arraycopy(data, position.toInt(), buffer, offset, length)
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+ return length
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+ }
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+
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+ override fun getSize(): Long = data.size.toLong()
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+
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+ override fun close() {
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+ // nothing to release
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+ }
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+ }
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+}
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