package com.sp365.calendar.components

import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.rememberLazyListState
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.remember
import androidx.compose.runtime.snapshotFlow
import com.sp365.calendar.model.EventNative
import com.sp365.calendar.utils.*
import java.time.LocalDate

@Composable
fun TaskList(currentDate: LocalDate, jobs: List<EventNative>, onDateChange: (LocalDate) -> Unit) {
    val listState = rememberLazyListState()
    val daysList = remember { generateDaysList(currentDate, yearsBefore = 10, yearsAfter = 10) }

    LaunchedEffect(currentDate) {
        val index = daysList.indexOf(currentDate)
        if (index != -1) {
            listState.scrollToItem(index)
        }
    }

    LaunchedEffect(listState) {
        snapshotFlow { listState.firstVisibleItemIndex }
            .collect { index ->
                val newDate = daysList.getOrNull(index)
                if (newDate != null && newDate != currentDate) {
                    onDateChange(newDate)
                }
            }
    }

    LazyColumn(state = listState) {
        items(daysList.size) { index ->
            val date = daysList[index]
            DayTaskItem(date, jobs)
        }
    }
}