package net.bluemangoo.indpjsk.vpn

import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.flow.update
import java.time.LocalTime
import java.time.format.DateTimeFormatter

enum class LogLevel { INFO, WARN, ERROR, SUCCESS }

data class LogEntry(
    val time: String,
    val level: LogLevel,
    val message: String
)

object VpnLog {

    private const val MAX = 800
    private val timeFmt = DateTimeFormatter.ofPattern("HH:mm:ss.SSS")

    private val _logs = MutableStateFlow<List<LogEntry>>(emptyList())
    val logs: StateFlow<List<LogEntry>> = _logs.asStateFlow()

    private fun append(level: LogLevel, msg: String) {
        val entry = LogEntry(
            time = LocalTime.now().format(timeFmt),
            level = level,
            message = msg
        )
        _logs.update { (it + entry).takeLast(MAX) }
    }

    fun info(msg: String) = append(LogLevel.INFO, msg)
    fun warn(msg: String) = append(LogLevel.WARN, msg)
    fun error(msg: String) = append(LogLevel.ERROR, msg)
    fun success(msg: String) = append(LogLevel.SUCCESS, msg)

    fun clear() {
        _logs.value = emptyList()
    }
}