package core.presentation.settings

import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.verticalScroll
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.*
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.hilt.navigation.compose.hiltViewModel
import ru.knot.messager.R

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun SettingsScreen(
    onBack: () -> Unit,
    onLogout: () -> Unit = {},
    viewModel: SettingsViewModel = hiltViewModel()
) {
    val state by viewModel.state.collectAsState()
    var baseUrl by remember(state.baseUrl) { mutableStateOf(state.baseUrl) }

    // Убран автоматический вызов loadConfig() - теперь только по кнопке Refresh

    Scaffold(
        containerColor = Color(0xFF0F0F10),
        topBar = {
            TopAppBar(
                title = { Text(stringResource(R.string.settings), fontWeight = FontWeight.Bold) },
                navigationIcon = {
                    IconButton(onClick = onBack) {
                        Icon(Icons.Default.ArrowBack, contentDescription = stringResource(R.string.back), tint = Color.White)
                    }
                },
                actions = {
                    IconButton(onClick = { viewModel.loadConfig() }) {
                        Icon(Icons.Default.Sync, contentDescription = "Refresh", tint = Color.White)
                    }
                },
                colors = TopAppBarDefaults.topAppBarColors(
                    containerColor = Color(0xFF0F0F10),
                    titleContentColor = Color.White
                )
            )
        }
    ) { paddingValues ->
        Column(
            modifier = Modifier
                .fillMaxSize()
                .padding(paddingValues)
                .verticalScroll(rememberScrollState())
                .padding(16.dp)
        ) {
            if (state.isLoading) {
                LinearProgressIndicator(
                    modifier = Modifier.fillMaxWidth().padding(bottom = 16.dp),
                    color = Color(0xFF3390EC)
                )
            }
            
            if (state.error != null) {
                Text(
                    text = "Ошибка обновления: ${state.error}",
                    color = Color.Red,
                    style = MaterialTheme.typography.labelSmall,
                    modifier = Modifier.padding(bottom = 16.dp)
                )
            }
            // Server Section
            SettingsSection(title = stringResource(R.string.server_connection)) {
                Column(modifier = Modifier.padding(12.dp)) {
                    Text(
                        text = stringResource(R.string.api_base_url),
                        style = MaterialTheme.typography.labelMedium,
                        color = Color(0xFF3390EC)
                    )
                    Row(verticalAlignment = Alignment.CenterVertically) {
                        TextField(
                            value = baseUrl,
                            onValueChange = { baseUrl = it },
                            modifier = Modifier.weight(1f),
                            colors = TextFieldDefaults.colors(
                                focusedContainerColor = Color.Transparent,
                                unfocusedContainerColor = Color.Transparent,
                                focusedTextColor = Color.White,
                                unfocusedTextColor = Color.White,
                                focusedIndicatorColor = Color(0xFF3390EC),
                                unfocusedIndicatorColor = Color.Gray.copy(alpha = 0.5f)
                            ),
                            placeholder = { 
                                Text("Например: http://192.168.1.100:5034/api/", color = Color.Gray.copy(alpha = 0.5f)) 
                            }
                        )
                        IconButton(onClick = { viewModel.saveBaseUrl(baseUrl) }) {
                            Icon(Icons.Default.Save, contentDescription = null, tint = Color(0xFF3390EC))
                        }
                    }
                }
            }

            Spacer(modifier = Modifier.height(24.dp))

            // Features Section
            SettingsSection(title = stringResource(R.string.server_features)) {
                Column {
                    SettingsToggleItem(
                        icon = Icons.Default.History,
                        label = stringResource(R.string.stories),
                        enabled = state.config.features.stories
                    )
                    SettingsToggleItem(
                        icon = Icons.Default.Poll,
                        label = stringResource(R.string.polls),
                        enabled = state.config.features.polls
                    )
                    SettingsToggleItem(
                        icon = Icons.Default.Call,
                        label = stringResource(R.string.calls),
                        enabled = state.config.features.calls
                    )
                    SettingsToggleItem(
                        icon = Icons.Default.Group,
                        label = stringResource(R.string.groups),
                        enabled = state.config.features.groups
                    )
                }
            }

            Spacer(modifier = Modifier.height(24.dp))

            // Limits Section
            SettingsSection(title = stringResource(R.string.limits)) {
                Column {
                    SettingsInfoItem(
                        icon = Icons.Default.Storage,
                        label = stringResource(R.string.max_file_size),
                        value = "${state.config.limits.maxFileSize / (1024 * 1024)} MB"
                    )
                    SettingsInfoItem(
                        icon = Icons.Default.People,
                        label = stringResource(R.string.max_group_members),
                        value = state.config.limits.maxGroupMembers.toString()
                    )
                }
            }

            Spacer(modifier = Modifier.height(32.dp))

            // Logout Button
            Button(
                onClick = onLogout,
                modifier = Modifier.fillMaxWidth(),
                colors = ButtonDefaults.buttonColors(containerColor = Color(0xFFE53935)),
                shape = RoundedCornerShape(12.dp)
            ) {
                Icon(Icons.Default.Logout, contentDescription = null)
                Spacer(modifier = Modifier.width(8.dp))
                Text(stringResource(R.string.log_out), fontWeight = FontWeight.Bold)
            }
            
            Spacer(modifier = Modifier.height(80.dp)) // Space for bottom bar
        }
    }
}

@Composable
fun SettingsSection(title: String, content: @Composable () -> Unit) {
    Column {
        Text(
            text = title.uppercase(),
            style = MaterialTheme.typography.labelSmall,
            color = Color(0xFF3390EC),
            fontWeight = FontWeight.Bold,
            modifier = Modifier.padding(start = 8.dp, bottom = 8.dp)
        )
        Surface(
            color = Color(0xFF1C1C1E),
            shape = RoundedCornerShape(16.dp),
            modifier = Modifier.fillMaxWidth()
        ) {
            content()
        }
    }
}

@Composable
fun SettingsToggleItem(icon: ImageVector, label: String, enabled: Boolean) {
    Row(
        modifier = Modifier
            .fillMaxWidth()
            .padding(16.dp),
        verticalAlignment = Alignment.CenterVertically,
        horizontalArrangement = Arrangement.SpaceBetween
    ) {
        Row(verticalAlignment = Alignment.CenterVertically) {
            Icon(icon, contentDescription = null, tint = Color.Gray, modifier = Modifier.size(24.dp))
            Spacer(modifier = Modifier.width(16.dp))
            Text(label, color = Color.White, fontSize = 16.sp)
        }
        Text(
            text = if (enabled) stringResource(R.string.enabled) else stringResource(R.string.disabled),
            color = if (enabled) Color(0xFF3390EC) else Color(0xFFE53935),
            fontWeight = FontWeight.Bold,
            fontSize = 14.sp
        )
    }
}

@Composable
fun SettingsInfoItem(icon: ImageVector, label: String, value: String) {
    Row(
        modifier = Modifier
            .fillMaxWidth()
            .padding(16.dp),
        verticalAlignment = Alignment.CenterVertically,
        horizontalArrangement = Arrangement.SpaceBetween
    ) {
        Row(verticalAlignment = Alignment.CenterVertically) {
            Icon(icon, contentDescription = null, tint = Color.Gray, modifier = Modifier.size(24.dp))
            Spacer(modifier = Modifier.width(16.dp))
            Text(label, color = Color.White, fontSize = 16.sp)
        }
        Text(
            text = value,
            color = Color.White,
            fontWeight = FontWeight.Medium,
            fontSize = 14.sp
        )
    }
}