package contacts.presentation

import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Search
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import androidx.compose.ui.res.stringResource
import contacts.data.remote.api.ContactDto
import core.presentation.components.AppAvatar
import core.presentation.theme.SoftSquareShape
import ru.knot.messager.R

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun ContactListScreen(
    contacts: List<ContactDto>,
    isLoading: Boolean = false,
    onContactClick: (String) -> Unit,
    onSearchChange: (String) -> Unit
) {
    var searchQuery by remember { mutableStateOf("") }
    var selectedTab by remember { mutableIntStateOf(0) }
    val tabs = listOf(
        stringResource(R.string.all),
        stringResource(R.string.online_tab)
    )

    Scaffold(
        topBar = {
            Column {
                TopAppBar(
                    title = { Text(stringResource(R.string.contacts_title)) },
                    colors = TopAppBarDefaults.topAppBarColors(
                        containerColor = MaterialTheme.colorScheme.primaryContainer
                    )
                )
                TabRow(selectedTabIndex = selectedTab) {
                    tabs.forEachIndexed { index, title ->
                        Tab(
                            selected = selectedTab == index,
                            onClick = { selectedTab = index },
                            text = { Text(title) }
                        )
                    }
                }
            }
        }
    ) { paddingValues ->
        Column(
            modifier = Modifier
                .fillMaxSize()
                .padding(paddingValues)
        ) {
            // Поисковая строка
            OutlinedTextField(
                value = searchQuery,
                onValueChange = { 
                    searchQuery = it
                    onSearchChange(it)
                },
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(horizontal = 16.dp, vertical = 8.dp),
                placeholder = { Text(stringResource(R.string.search_hint)) },
                leadingIcon = { Icon(Icons.Default.Search, contentDescription = null) },
                shape = SoftSquareShape
            )

            if (isLoading) {
                Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
                    CircularProgressIndicator()
                }
            } else {
                val filteredContacts = contacts.filter { 
                    if (selectedTab == 1) it.isOnline else true 
                }

                LazyColumn(modifier = Modifier.fillMaxSize()) {
                    items(filteredContacts) { contact ->
                        ContactItem(contact = contact, onClick = { onContactClick(contact.id) })
                    }
                }
            }
        }
    }
}

@Composable
fun ContactItem(contact: ContactDto, onClick: () -> Unit) {
    Row(
        modifier = Modifier
            .fillMaxWidth()
            .clickable(onClick = onClick)
            .padding(16.dp, 8.dp),
        verticalAlignment = Alignment.CenterVertically
    ) {
        AppAvatar(
            url = contact.avatarUrl,
            name = contact.username,
            size = 56.dp
        )
        
        Spacer(modifier = Modifier.width(16.dp))

        Column(modifier = Modifier.weight(1f)) {
            Text(
                text = contact.displayName ?: contact.username,
                style = MaterialTheme.typography.titleMedium,
                color = MaterialTheme.colorScheme.onSurface
            )
            val statusText = if (contact.isOnline) {
                stringResource(R.string.online)
            } else {
                stringResource(R.string.last_seen, contact.lastSeen ?: stringResource(R.string.last_seen_recently))
            }
            Text(
                text = statusText,
                style = MaterialTheme.typography.bodySmall,
                color = if (contact.isOnline) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.onSurfaceVariant
            )
        }
    }
}