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package com.example.lab6_2024_2025_eng

import android.content.Intent
import android.os.Bundle
import android.webkit.JavascriptInterface
import android.webkit.WebView
import androidx.appcompat.app.AppCompatActivity

// -------- JS interface (must be a separate class) ----------
class GiftsJS(private val activity: Gifts) {

@JavascriptInterface
    fun addGift(name: String) {
        activity.giftsList.add(name)
    }

@JavascriptInterface
    fun generateCard() {
        val intent = Intent(activity, Card::class.java)

// join all gifts into one long string
        intent.putExtra("gifts", activity.giftsList.joinToString("\n"))

activity.startActivity(intent)
    }
}

// -------- Gifts Activity -----------------------------------
class Gifts : AppCompatActivity() {

val giftsList = ArrayList<String>()   // new list every app launch

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

val page = WebView(this)
        page.settings.javaScriptEnabled = true

page.addJavascriptInterface(GiftsJS(this), "backend")

page.loadUrl("file:///android_asset/Gifts.html")

setContentView(page)
    }
}

<button onclick="addGift()">Add</button>
<button onclick="generate()">Generate postcard</button>

function generate() {
        backend.generateCard();
    }
</script>

</body>
</html>

package com.example.lab6_2024_2025_eng

import android.os.Bundle
import android.webkit.JavascriptInterface
import android.webkit.WebView
import androidx.appcompat.app.AppCompatActivity

class CardJS(private val gifts: String) {
    @JavascriptInterface
    fun getGifts(): String = gifts
}

class Card : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

val gifts = intent.getStringExtra("gifts") ?: ""

val page = WebView(this)
        page.settings.javaScriptEnabled = true
        page.addJavascriptInterface(CardJS(gifts), "backend")

page.loadUrl("file:///android_asset/Card.html")

setContentView(page)
    }
}

</body>
</html>

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