ServerCallScreen.kt

package studio.moondev.samples.demo.server

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.material3.Button
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import io.moondev.server.MoonServerClient
import io.moondev.server.MoonServerException
import kotlinx.coroutines.launch
import org.koin.compose.koinInject

/**
 * Demonstrates calling a backend endpoint via [MoonServerClient].
 *
 * Loading / error states are modeled explicitly so it is obvious how to
 * surface transient errors to the UI. [MoonServerException] is the only
 * checked failure thrown by the client.
 */
@Composable
fun ServerCallScreen() {
    val client = koinInject<MoonServerClient>()
    val scope = rememberCoroutineScope()

    var loading by remember { mutableStateOf(false) }
    var result by remember { mutableStateOf("") }

    Column(
        modifier = Modifier.fillMaxWidth(),
        verticalArrangement = Arrangement.spacedBy(8.dp)
    ) {
        Text(text = "MoonServerClient sample")
        Button(onClick = {
            scope.launch {
                loading = true
                result = runCatching {
                    // TODO(cc): verify signature with library v1.0.0 API reference.
                    // val res: String = client.get("/health")
                    "OK (replace with client.get(\"/health\"))"
                }.getOrElse { err ->
                    when (err) {
                        is MoonServerException -> "Server error: ${err.message}"
                        else -> "Unexpected error: ${err.message}"
                    }
                }
                loading = false
            }
        }) { Text("GET /health") }

        if (loading) CircularProgressIndicator()
        Text(text = result)
    }
}