package network

import androidx.compose.runtime.mutableStateListOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.ui.graphics.Color
import io.ktor.client.*
import io.ktor.client.engine.cio.*
import io.ktor.client.plugins.HttpTimeout
import io.ktor.client.plugins.logging.DEFAULT
import io.ktor.client.plugins.logging.LogLevel
import io.ktor.client.plugins.logging.Logger
import io.ktor.client.plugins.logging.Logging
import io.ktor.client.plugins.websocket.*
import io.ktor.http.*
import io.ktor.websocket.*
import kotlinx.coroutines.*
import kotlinx.coroutines.flow.consumeAsFlow
import model.AppConfig
import model.KisSession
import model.RealTimeTrade
import model.TradeType

class KisWebSocketManager {
    private val client = HttpClient(CIO) {
        install(WebSockets) {
            pingInterval = 20_000
        }
        install(HttpTimeout) {
            requestTimeoutMillis = 15_000
            connectTimeoutMillis = 15_000
            socketTimeoutMillis = 15_000
        }
        install(Logging) {
            logger = Logger.DEFAULT
            level = LogLevel.ALL // 상세한 디버깅을 위해 ALL로 변경
        }
    }

    private var session: DefaultClientWebSocketSession? = null
    private val scope = CoroutineScope(Dispatchers.Default + Job())

    // UI 관찰 상태값
    val currentPrice = mutableStateOf("0")
    val priceChangeColor = mutableStateOf(Color.Transparent)
    val tradeLogs = mutableStateListOf<RealTimeTrade>()
    suspend fun connect() {
        val config = KisSession.config
        val approvalKey = config.websocketToken

        if (approvalKey.isEmpty()) {
            println("⚠️ 웹소켓 승인키가 없습니다. 먼저 발급받아야 합니다.")
            return
        }

        // 시세 데이터는 항상 실전 서버(21000)를 권장합니다.
        val hostUrl = "ops.koreainvestment.com"
        val port = 21000

        scope.launch {
            try {
                client.webSocket(method = HttpMethod.Get, host = hostUrl, port = port, path = "/tryitout/H0STCNT0") {
                    session = this
                    println("✅ 웹소켓 연결 성공")

                    incoming.consumeAsFlow().collect { frame ->
                        if (frame is Frame.Text) {
                            parseTradeData(frame.readText())
                        }
                    }
                }
            } catch (e: Exception) {
                println("❌ 웹소켓 연결 오류: ${e.localizedMessage}")
            }
        }
    }

    private fun parseTradeData(data: String) {
        // 한국투자증권 데이터 포맷: 수신구분|TRID|데이터건수|체결데이터
        val parts = data.split("|")
        if (parts.size > 3) {
            val rows = parts[3].split("^")
            if (rows.size > 15) {
                val newTrade = RealTimeTrade(
                    time = rows[1].chunked(2).joinToString(":"), // HHMMSS -> HH:MM:SS
                    price = rows[2],
                    change = rows[4],
                    volume = rows[12],
                    type = if (rows[15] == "1") TradeType.BUY else TradeType.SELL
                )

                // 메인 스레드에서 UI 상태 업데이트
                CoroutineScope(Dispatchers.Main).launch {
                    tradeLogs.add(0, newTrade) // 최신 데이터를 맨 위로
                    if (tradeLogs.size > 30) tradeLogs.removeLast()

                    // 현재가 및 색상 업데이트 로직 포함 가능
                    currentPrice.value = newTrade.price
                }
            }
        }

    }
    private fun updatePriceWithEffect(newPrice: String) {
        val oldPrice = currentPrice.value.replace(",", "").toIntOrNull() ?: 0
        val current = newPrice.toIntOrNull() ?: 0

        currentPrice.value = String.format("%, d", current)
        priceChangeColor.value = when {
            current > oldPrice -> Color.Red.copy(alpha = 0.2f)
            current < oldPrice -> Color.Blue.copy(alpha = 0.2f)
            else -> Color.Transparent
        }
    }

    /**
     * [2] 실시간 시세 구독 (Registration)
     * tr_type = "1" (등록)
     */
    suspend fun subscribeStock(stockCode: String) {
        sendRequest(stockCode, trType = "1")
        println("📡 실시간 시세 구독 시작: $stockCode")
    }

    /**
     * [3] 실시간 시세 구독 취소 (Unsubscription)
     * tr_type = "2" (해제)
     */
    suspend fun unsubscribeStock(stockCode: String) {
        if (stockCode.isEmpty()) return
        sendRequest(stockCode, trType = "2")
        println("🚫 실시간 시세 구독 해제: $stockCode")
    }

    /**
     * 공통 요청 전송 함수
     */
    private suspend fun sendRequest(stockCode: String, trType: String) {
        val currentSession = session ?: return
        val config = KisSession.config

        val requestJson = """
        {
            "header": {
                "approval_key": "${config.websocketToken}",
                "custtype": "P",
                "tr_type": "$trType",
                "content-type": "utf-8"
            },
            "body": {
                "input": {
                    "tr_id": "H0STCNT0",
                    "tr_key": "$stockCode"
                }
            }
        }
        """.trimIndent()

        try {
            currentSession.send(Frame.Text(requestJson))
        } catch (e: Exception) {
            println("❌ 웹소켓 요청 실패 ($trType): ${e.localizedMessage}")
        }
    }
}