package net.tinsae.clocked.components

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.material3.Button
import androidx.compose.material3.DatePicker
import androidx.compose.material3.DatePickerDialog
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.ModalBottomSheet
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.material3.rememberDatePickerState
import androidx.compose.material3.rememberModalBottomSheetState
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.input.KeyboardType
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import kotlinx.datetime.TimeZone
import kotlinx.datetime.toLocalDateTime
import net.tinsae.clocked.R
import net.tinsae.clocked.data.EntryType
import net.tinsae.clocked.ui.theme.ClockedTheme
import kotlin.time.Clock
import kotlin.time.Duration
import kotlin.time.Duration.Companion.minutes
import kotlin.time.Instant

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun AddLogDialog(
    type: EntryType,
    onDismiss: () -> Unit,
    onSave: (timestamp: Instant, duration: Duration, reason: String?) -> Unit
) {
    val sheetState = rememberModalBottomSheetState()
    var hours by remember { mutableStateOf("") }
    var minutes by remember { mutableStateOf("") }
    var reason by remember { mutableStateOf("") }

    var selectedInstant by remember { mutableStateOf(Clock.System.now()) }
    var showDatePicker by remember { mutableStateOf(false) }

    // Custom date formatting logic using kotlinx-datetime
    val localDateTime = selectedInstant.toLocalDateTime(TimeZone.currentSystemDefault())
    val formattedDate = "${localDateTime.month.name.take(3).lowercase().replaceFirstChar { it.uppercase() }} ${localDateTime.day}, ${localDateTime.year}"

    if (showDatePicker) {
        val datePickerState = rememberDatePickerState(initialSelectedDateMillis = selectedInstant.toEpochMilliseconds())
        DatePickerDialog(
            onDismissRequest = { showDatePicker = false },
            confirmButton = {
                TextButton(onClick = {
                    datePickerState.selectedDateMillis?.let { millis ->
                        selectedInstant = Instant.fromEpochMilliseconds(millis)
                    }
                    showDatePicker = false
                }) {
                    Text(stringResource(id = R.string.ok))
                }
            },
            dismissButton = {
                TextButton(onClick = { showDatePicker = false }) {
                    Text(stringResource(id = R.string.cancel))
                }
            }
        ) {
            DatePicker(state = datePickerState)
        }
    }

    ModalBottomSheet(
        onDismissRequest = onDismiss,
        sheetState = sheetState
    ) {
        Column(
            modifier = Modifier
                .padding(16.dp)
                .fillMaxWidth(),
            verticalArrangement = Arrangement.spacedBy(16.dp)
        ) {
            Text(
                text = if (type == EntryType.OVERTIME) stringResource(id = R.string.add_overtime_title) else stringResource(id = R.string.add_time_off_title),
                style = MaterialTheme.typography.titleLarge
            )

            // Date Row
            Row(
                modifier = Modifier.fillMaxWidth(),
                verticalAlignment = Alignment.CenterVertically,
                horizontalArrangement = Arrangement.SpaceBetween
            ) {
                Text(stringResource(id = R.string.date), style = MaterialTheme.typography.bodyLarge)
                TextButton(
                    onClick = { showDatePicker = true },
                ) {
                    Text(formattedDate,
                        style = MaterialTheme.typography.bodyLarge)
                }
            }

            // Duration Row
            Text(
                text = stringResource(id = R.string.duration),
                style = MaterialTheme.typography.bodyLarge,
            )
            Row(
                modifier = Modifier.fillMaxWidth(),
                verticalAlignment = Alignment.CenterVertically
            ) {
                OutlinedTextField(
                    value = hours,
                    onValueChange = { hours = it.filter(Char::isDigit) },
                    label = { Text(stringResource(id = R.string.hours)) },
                    keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number),
                    modifier = Modifier.weight(0.5f)
                )
                Spacer(modifier = Modifier.width(8.dp))
                OutlinedTextField(
                    value = minutes,
                    onValueChange = {
                        val filtered = it.filter(Char::isDigit)
                        if (filtered.isEmpty() || filtered.toInt() < 60) {
                            minutes = filtered
                        }
                    },
                    label = { Text(stringResource(id = R.string.minutes)) },
                    keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number),
                    modifier = Modifier.weight(0.5f)
                )
            }

            // Reason Field
            OutlinedTextField(
                value = reason,
                onValueChange = { reason = it },
                label = { Text(stringResource(id = R.string.reason)) },
                modifier = Modifier.fillMaxWidth()
            )

            // Action Buttons
            Row(
                modifier = Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.End,
            ) {
                TextButton(onClick = onDismiss) {
                    Text(stringResource(id = R.string.cancel))
                }
                Spacer(modifier = Modifier.width(8.dp))
                Button(
                    onClick = {
                        val h = hours.toLongOrNull() ?: 0L
                        val m = minutes.toLongOrNull() ?: 0L
                        val totalMinutes = if (type == EntryType.OVERTIME) h * 60 + m else -(h * 60 + m)
                        val duration = totalMinutes.minutes
                        onSave(selectedInstant, duration, reason.takeIf(String::isNotBlank))
                    }
                ) {
                    Text(stringResource(id = R.string.save))
                }
            }
        }
    }
}
@Preview(showBackground = true)
@Composable
fun AddLogDialogPreview(){
    ClockedTheme {
        AddLogDialog(
            type = EntryType.OVERTIME,
            onDismiss = {},
            onSave = { _, _, _ -> }
        )
    }
}