package ui

import androidx.compose.foundation.border
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.*
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.FolderOpen
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.DragData
import androidx.compose.ui.ExperimentalComposeUiApi
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.onExternalDrag
import androidx.compose.ui.text.input.PasswordVisualTransformation
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import kotlinx.coroutines.launch
import model.AppConfig
import network.KisAuthService
import org.jetbrains.exposed.sql.deleteAll
import org.jetbrains.exposed.sql.insert
import org.jetbrains.exposed.sql.transactions.transaction
import javax.swing.JFileChooser
import javax.swing.filechooser.FileNameExtensionFilter
import androidx.compose.ui.unit.dp
import androidx.compose.ui.window.Dialog // 파일 선택기용


@OptIn(ExperimentalComposeUiApi::class)
@Composable
fun SettingsScreen(
    initialConfig: AppConfig, // 모델 경로가 포함된 확장된 AppConfig 필요
    onAuthSuccess: (AppConfig, String) -> Unit
) {
    val scope = rememberCoroutineScope()
    val authService = remember { KisAuthService() }

    // 화면 입력 상태값
    var appKey by remember { mutableStateOf(initialConfig.appKey) }
    var secretKey by remember { mutableStateOf(initialConfig.secretKey) }
    var accountNo by remember { mutableStateOf(initialConfig.accountNo) }
    var isSimulation by remember { mutableStateOf(initialConfig.isSimulation) }
    var modelPath by remember { mutableStateOf(initialConfig.modelPath ?: "") } // AI 모델 경로

    var statusMessage by remember { mutableStateOf("설정 정보를 입력하세요.") }
    var isLoading by remember { mutableStateOf(false) }

    LazyColumn(modifier = Modifier.fillMaxSize().padding(24.dp)) {
        item {
            Text("API 및 계좌 설정", style = MaterialTheme.typography.h6)
            OutlinedTextField(value = appKey, onValueChange = { appKey = it }, label = { Text("App Key") }, modifier = Modifier.fillMaxWidth())
            OutlinedTextField(value = secretKey, onValueChange = { secretKey = it }, label = { Text("Secret Key") }, modifier = Modifier.fillMaxWidth(), visualTransformation = PasswordVisualTransformation())
            OutlinedTextField(value = accountNo, onValueChange = { accountNo = it }, label = { Text("계좌번호") }, modifier = Modifier.fillMaxWidth())
            Row(verticalAlignment = Alignment.CenterVertically) {
                Checkbox(checked = isSimulation, onCheckedChange = { isSimulation = it })
                Text("모의투자 서버 사용")
            }

            Divider(Modifier.padding(vertical = 16.dp))

            // --- 추가된 AI 모델 설정 섹션 ---
            Text("AI 모델 설정 (Gemma-2-9b)", style = MaterialTheme.typography.h6)
            Spacer(modifier = Modifier.height(8.dp))

            Row(verticalAlignment = Alignment.CenterVertically) {
                OutlinedTextField(
                    value = modelPath,
                    onValueChange = { modelPath = it },
                    label = { Text("GGUF 모델 경로") },
                    modifier = Modifier.weight(1f),
                    placeholder = { Text("파일을 선택하거나 드래그하세요") }
                )
                IconButton(onClick = {
                    val chooser = JFileChooser().apply {
                        fileFilter = FileNameExtensionFilter("GGUF 모델", "gguf")
                    }
                    if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
                        modelPath = chooser.selectedFile.absolutePath
                    }
                }) {
                    Icon(Icons.Default.FolderOpen, contentDescription = "파일 선택")
                }
            }

            // 드래그 앤 드롭 영역
            Box(
                modifier = Modifier
                    .fillMaxWidth()
                    .height(80.dp)
                    .padding(top = 8.dp)
                    .border(1.dp, Color.LightGray, RoundedCornerShape(8.dp))
                    .onExternalDrag(onDrop = { state ->
                        val data = state.dragData
                        if (data is DragData.FilesList) {
                            val path = data.readFiles().firstOrNull()?.removePrefix("file:")
                            if (path?.endsWith(".gguf") == true) modelPath = path
                        }
                    }),
                contentAlignment = Alignment.Center
            ) {
                Text("여기에 .gguf 파일을 드래그하여 놓으세요", fontSize = 12.sp, color = Color.Gray)
            }

            Spacer(modifier = Modifier.height(24.dp))

            // 저장 및 접속 버튼
            Button(
                modifier = Modifier.fillMaxWidth().height(50.dp),
                enabled = !isLoading,
                onClick = {
                    isLoading = true
                    scope.launch {
                        // 1. 새로운 설정 객체 생성 (순서 주의: isSimulation 다음 modelPath)
                        val config = AppConfig(
                            appKey = appKey.trim(),
                            secretKey = secretKey.trim(),
                            accountNo = accountNo.trim(),
                            isSimulation = isSimulation,
                            modelPath = modelPath
                        )

                        transaction {
                            ConfigTable.deleteAll()
                            ConfigTable.insert {
                                it[ConfigTable.appKey] = config.appKey
                                it[ConfigTable.secretKey] = config.secretKey
                                it[ConfigTable.accountNo] = config.accountNo
                                it[ConfigTable.isSimulation] = config.isSimulation
                                it[ConfigTable.modelPath] = config.modelPath
                            }
                        }

                        statusMessage = "인증 토큰 발급 시도 중..."
                        authService.fetchAccessToken(appKey, secretKey, isSimulation)
                            .onSuccess { response ->
                                statusMessage = "✅ 인증 성공!"
                                onAuthSuccess(config, response.access_token)
                            }.onFailure {
                                statusMessage = "❌ 인증 실패(정보 저장됨): ${it.localizedMessage}"
                            }
                        isLoading = false
                    }
                }
            ) {
                if (isLoading) {
                    // [수정된 프로그래스 바] size -> Modifier.size
                    CircularProgressIndicator(
                        modifier = Modifier.size(20.dp),
                        color = Color.White,
                        strokeWidth = 2.dp
                    )
                } else {
                    Text("설정 저장 및 접속 시작")
                }
            }

            Spacer(modifier = Modifier.height(16.dp))
            Text(statusMessage, color = if (statusMessage.contains("✅")) Color.Green else Color.Gray)
        }
    }
}