atrade/src/main/kotlin/ui/BalanceSection.kt

// src/main/kotlin/ui/BalanceSection.kt
package ui

import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import model.UnifiedBalance
import network.KisTradeService

@Composable
fun BalanceSection(
    tradeService: KisTradeService,
    onStockSelect: (code: String, name: String, isDomestic: Boolean) -> Unit
) {
    var balanceData by remember { mutableStateOf<UnifiedBalance?>(null) }
    var isLoading by remember { mutableStateOf(false) }

    // 화면 진입 시 및 갱신 시 데이터 로드
    LaunchedEffect(Unit) {
        isLoading = true
        tradeService.fetchIntegratedBalance().onSuccess {
            balanceData = it
        }.onFailure {
            println("❌ 잔고 로드 실패: ${it.localizedMessage}")
        }
        isLoading = false
    }

    Column(modifier = Modifier.fillMaxSize()) {
        Text(
            text = "나의 자산",
            style = MaterialTheme.typography.h6,
            fontWeight = FontWeight.Bold,
            modifier = Modifier.padding(bottom = 8.dp)
        )

        // 1. 자산 요약 카드
        BalanceSummaryCard(balanceData)

        Spacer(modifier = Modifier.height(16.dp))

        // 2. 통합 보유 종목 리스트
        Text(
            text = "보유 종목",
            style = MaterialTheme.typography.subtitle1,
            fontWeight = FontWeight.Bold,
            modifier = Modifier.padding(vertical = 8.dp)
        )

        if (isLoading) {
            Box(Modifier.fillMaxSize(), contentAlignment = androidx.compose.ui.Alignment.Center) {
                CircularProgressIndicator()
            }
        } else {
            LazyColumn(modifier = Modifier.weight(1f, true)) {
                items(balanceData?.holdings ?: emptyList()) { holding ->
                    UnifiedStockItemRow(holding) {
                        onStockSelect(holding.code, holding.name, holding.isDomestic)
                    }
                }
            }
        }
    }
}

@Composable
fun BalanceSummaryCard(summary: UnifiedBalance?) {
    Card(
        elevation = 2.dp,
        shape = androidx.compose.foundation.shape.RoundedCornerShape(8.dp),
        modifier = Modifier.fillMaxWidth(),
        backgroundColor = androidx.compose.ui.graphics.Color.White
    ) {
        Column(modifier = Modifier.padding(16.dp)) {
            Text("총 평가 자산", style = MaterialTheme.typography.caption, color = androidx.compose.ui.graphics.Color.Gray)
            Text(
                text = "${summary?.totalAsset ?: "0"} 원",
                style = MaterialTheme.typography.h5,
                fontWeight = FontWeight.Bold
            )

            val rate = summary?.totalProfitRate?.toDoubleOrNull() ?: 0.0
            val color = if (rate > 0) androidx.compose.ui.graphics.Color.Red
            else if (rate < 0) androidx.compose.ui.graphics.Color.Blue
            else androidx.compose.ui.graphics.Color.DarkGray

            Text(
                text = "수익률: ${if (rate > 0) "+" else ""}$rate%",
                color = color,
                style = MaterialTheme.typography.body2,
                fontWeight = FontWeight.Medium
            )
        }
    }
}

@Composable
fun UnifiedStockItemRow(holding: model.UnifiedStockHolding, onClick: () -> Unit) {
    Card(
        modifier = Modifier.fillMaxWidth().padding(vertical = 4.dp).clickable { onClick() },
        elevation = 1.dp
    ) {
        Row(modifier = Modifier.padding(12.dp), verticalAlignment = androidx.compose.ui.Alignment.CenterVertically) {
            Column(modifier = Modifier.weight(1f)) {
                Row(verticalAlignment = androidx.compose.ui.Alignment.CenterVertically) {
                    // 국내/해외 구분 배지
                    Surface(
                        color = if (holding.isDomestic) androidx.compose.ui.graphics.Color(0xFFE3F2FD)
                        else androidx.compose.ui.graphics.Color(0xFFF3E5F5),
                        shape = androidx.compose.foundation.shape.RoundedCornerShape(4.dp)
                    ) {
                        Text(
                            text = if (holding.isDomestic) "국내" else "해외",
                            modifier = Modifier.padding(horizontal = 4.dp, vertical = 2.dp),
                            fontSize = 10.sp,
                            color = if (holding.isDomestic) androidx.compose.ui.graphics.Color.Blue
                            else androidx.compose.ui.graphics.Color(0xFF7B1FA2)
                        )
                    }
                    Spacer(Modifier.width(4.dp))
                    Text(holding.name, fontWeight = FontWeight.Bold, maxLines = 1)
                }
                Text(holding.code, style = MaterialTheme.typography.caption, color = androidx.compose.ui.graphics.Color.Gray)
            }

            Column(horizontalAlignment = androidx.compose.ui.Alignment.End) {
                Text("${holding.currentPrice} 원")
                val rate = holding.profitRate.toDoubleOrNull() ?: 0.0
                Text(
                    text = "${if (rate > 0) "▲" else if (rate < 0) "▼" else ""}${holding.profitRate}%",
                    color = if (rate > 0) androidx.compose.ui.graphics.Color.Red
                    else if (rate < 0) androidx.compose.ui.graphics.Color.Blue
                    else androidx.compose.ui.graphics.Color.DarkGray,
                    fontSize = 12.sp
                )
            }
        }
    }
}