package com.sp365.calendar.components

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import com.google.accompanist.pager.ExperimentalPagerApi
import com.google.accompanist.pager.HorizontalPager
import com.sp365.calendar.utils.*
import java.time.LocalDate

@OptIn(ExperimentalPagerApi::class)
@Composable
fun WeekPager(
    pagerState: com.google.accompanist.pager.PagerState,
    currentDate: LocalDate,
    onDateSelected: (LocalDate) -> Unit
) {
    LaunchedEffect(currentDate) {
        val weeksFromStart = calculateWeeksFromStart(currentDate)
        val targetPage =
            weeksFromStart + 5000 // Đặt targetPage với mốc lớn hơn để cuộn sâu hơn về quá khứ
        pagerState.animateScrollToPage(targetPage)
    }

    HorizontalPager(
        state = pagerState,
        count = Int.MAX_VALUE,
        modifier = Modifier
            .fillMaxWidth()
            .background(Color.White)
            .padding(top = 4.dp, bottom = 4.dp)
    ) { page ->
        val startOfWeek =
            LocalDate.now().with(java.time.DayOfWeek.MONDAY).plusWeeks(page.toLong() - 5000)
        val weekDays = (0..6).map { startOfWeek.plusDays(it.toLong()) }

        Row(
            modifier = Modifier.fillMaxWidth(),
            horizontalArrangement = Arrangement.SpaceAround
        ) {
            weekDays.forEach { date ->
                DayItem(
                    date = date,
                    isSelected = date == currentDate,
                    isToday = date == LocalDate.now(),
                    onClick = { onDateSelected(date) }
                )
            }
        }
    }
}