package com.example.gravitydemo

import ai.gravityfield.gravity_sdk.GravitySDK
import ai.gravityfield.gravity_sdk.models.ContentImpressionEngagement
import ai.gravityfield.gravity_sdk.models.CustomEvent
import ai.gravityfield.gravity_sdk.models.PageContext
import android.content.Context
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

@Composable
fun CheckoutExperiment(
    pageContext: PageContext,
    activityContext: Context,
    onCheckout: () -> Unit,
) {
    var selected by remember(pageContext) { mutableStateOf<SelectedGravityContent?>(null) }
    var config by remember(pageContext) { mutableStateOf<CheckoutExperimentConfig?>(null) }
    var isLoading by remember(pageContext) { mutableStateOf(true) }

    LaunchedEffect(pageContext) {
        val result = loadRootGravityContent("checkout_button", pageContext)
        val decoded = result?.let(::decodeCheckoutExperiment)
        selected = if (decoded != null) result else null
        config = decoded
        isLoading = false
    }

    if (isLoading) {
        CircularProgressIndicator()
        return
    }

    val renderedContent = selected
    LaunchedEffect(renderedContent) {
        if (renderedContent != null) {
            GravitySDK.instance.sendContentEngagement(
                ContentImpressionEngagement(renderedContent.content, renderedContent.campaign)
            )
        }
    }
    Button(
        modifier = Modifier.padding(if (config?.variant == "compact") 8.dp else 16.dp),
        onClick = {
            GravitySDK.instance.triggerEvent(
                events = listOf(CustomEvent("checkout-started-v1", "Checkout Started")),
                pageContext = pageContext,
                activityContext = activityContext,
            )
            onCheckout()
        },
    ) {
        Text(config?.label ?: "Перейти к оплате")
    }
}