package chats.presentation.components

import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.compose.runtime.remember
import chats.domain.model.Chat
import chats.domain.model.MediaType
import core.presentation.components.AppAvatar
import ru.knot.messager.R

@Composable
fun ChatItem(
    chat: Chat,
    onClick: (String) -> Unit
) {
    Row(
        modifier = Modifier
            .fillMaxWidth()
            .clickable { onClick(chat.id) }
            .padding(12.dp),
        verticalAlignment = Alignment.CenterVertically
    ) {
        AppAvatar(
            url = chat.avatar,
            name = chat.name,
            size = 50.dp
        )

        Spacer(modifier = Modifier.width(12.dp))

        Column(modifier = Modifier.weight(1f)) {
            Row(
                modifier = Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.SpaceBetween
            ) {
                Text(
                    text = chat.name,
                    style = MaterialTheme.typography.bodyLarge.copy(fontWeight = FontWeight.Bold),
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis
                )
                chat.lastMessage?.let {
                    val formattedTime = remember(it.createdAt) {
                        try {
                            it.createdAt.substringAfter('T').take(5)
                        } catch (e: Exception) {
                            ""
                        }
                    }
                    Text(
                        text = formattedTime,
                        style = MaterialTheme.typography.labelSmall,
                        color = Color.Gray
                    )
                }
            }

            Row(
                modifier = Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.SpaceBetween
            ) {
                val context = LocalContext.current
                val previewText = remember(chat.lastMessage) {
                    val msg = chat.lastMessage
                    if (msg == null) return@remember context.getString(R.string.no_messages_yet)
                    
                    if (!msg.content.isNullOrBlank()) {
                        msg.content
                    } else if (msg.mediaType == MediaType.AUDIO) {
                        context.getString(R.string.voice_message)
                    } else if (msg.media.isNotEmpty()) {
                        when (msg.mediaType) {
                            MediaType.IMAGE -> "Фото"
                            MediaType.VIDEO -> "Видео"
                            MediaType.FILE -> "Файл"
                            else -> "Медиа"
                        }
                    } else {
                        context.getString(R.string.message)
                    }
                }
                Text(
                    text = previewText,
                    style = MaterialTheme.typography.bodyMedium,
                    color = Color.Gray,
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis,
                    modifier = Modifier.weight(1f)
                )

                if (chat.unreadCount > 0) {
                    Box(
                        modifier = Modifier
                            .padding(start = 8.dp)
                            .background(MaterialTheme.colorScheme.primary, CircleShape)
                            .padding(horizontal = 6.dp, vertical = 2.dp),
                        contentAlignment = Alignment.Center
                    ) {
                        Text(
                            text = chat.unreadCount.toString(),
                            color = Color.White,
                            fontSize = 10.sp,
                            fontWeight = FontWeight.Bold
                        )
                    }
                }
            }
        }
    }
}