feat: Implement collapsing header and block/unblock functionality in OtherProfileScreen

app/src/main/java/com/rosetta/messenger/ui/settings/OtherProfileScreen.kt

@@ -1,25 +1,46 @@
 package com.rosetta.messenger.ui.settings
 
 import androidx.activity.compose.BackHandler
+import androidx.compose.animation.core.Spring
+import androidx.compose.animation.core.spring
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.*
-import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material.icons.outlined.Block
-import androidx.compose.material.icons.outlined.ContentCopy
 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.draw.drawBehind
+import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.input.nestedscroll.NestedScrollConnection
+import androidx.compose.ui.input.nestedscroll.NestedScrollSource
+import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.platform.LocalConfiguration
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.IntOffset
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import com.rosetta.messenger.network.SearchUser
+import kotlin.math.roundToInt
 
+// Collapsing header constants
+private val EXPANDED_HEADER_HEIGHT_OTHER = 280.dp
+private val COLLAPSED_HEADER_HEIGHT_OTHER = 64.dp
+private val AVATAR_SIZE_EXPANDED_OTHER = 120.dp
+private val AVATAR_SIZE_COLLAPSED_OTHER = 36.dp
+
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun OtherProfileScreen(
     user: SearchUser,
@@ -31,182 +52,313 @@ fun OtherProfileScreen(
     val surfaceColor = if (isDarkTheme) Color(0xFF2C2C2E) else Color(0xFFF2F2F7)
     val textColor = if (isDarkTheme) Color.White else Color.Black
     val secondaryTextColor = if (isDarkTheme) Color(0xFF8E8E93) else Color(0xFF666666)
+    val avatarColors = getAvatarColor(user.publicKey, isDarkTheme)
+    val context = LocalContext.current
+    
+    // Scroll state for collapsing header animation
+    val density = LocalDensity.current
+    val statusBarHeight = WindowInsets.statusBars.asPaddingValues().calculateTopPadding()
+    val expandedHeightPx = with(density) { (EXPANDED_HEADER_HEIGHT_OTHER + statusBarHeight).toPx() }
+    val collapsedHeightPx = with(density) { (COLLAPSED_HEADER_HEIGHT_OTHER + statusBarHeight).toPx() }
+    
+    var scrollOffset by remember { mutableFloatStateOf(0f) }
+    val maxScrollOffset = expandedHeightPx - collapsedHeightPx
+    
+    val collapseProgress by remember {
+        derivedStateOf {
+            (scrollOffset / maxScrollOffset).coerceIn(0f, 1f)
+        }
+    }
+    
+    val nestedScrollConnection = remember {
+        object : NestedScrollConnection {
+            override fun onPreScroll(available: Offset, source: NestedScrollSource): Offset {
+                val delta = available.y
+                val newOffset = scrollOffset - delta
+                val consumed = when {
+                    delta < 0 && scrollOffset < maxScrollOffset -> {
+                        val consumed = (newOffset.coerceIn(0f, maxScrollOffset) - scrollOffset)
+                        scrollOffset = newOffset.coerceIn(0f, maxScrollOffset)
+                        -consumed
+                    }
+                    delta > 0 && scrollOffset > 0 -> {
+                        val consumed = scrollOffset - newOffset.coerceIn(0f, maxScrollOffset)
+                        scrollOffset = newOffset.coerceIn(0f, maxScrollOffset)
+                        consumed
+                    }
+                    else -> 0f
+                }
+                return Offset(0f, consumed)
+            }
+        }
+    }
     
     // Handle back gesture
     BackHandler { onBack() }
 
-    Column(
+    Box(
         modifier = Modifier
             .fillMaxSize()
             .background(backgroundColor)
-            .verticalScroll(rememberScrollState())
+            .nestedScroll(nestedScrollConnection)
     ) {
-        // Profile Card with avatar
-        ProfileCard(
-            name = user.title.ifEmpty { "Unknown User" },
-            username = user.username.ifEmpty { "" },
-            publicKey = user.publicKey,
-            isDarkTheme = isDarkTheme,
-            onBack = onBack,
-            hasChanges = false,
-            onSave = {}
-        )
-
-        Spacer(modifier = Modifier.height(16.dp))
-
-        Column(modifier = Modifier.padding(horizontal = 16.dp)) {
-            // Username Section (if available)
-            if (user.username.isNotBlank()) {
-                Text(
-                    text = "Username",
-                    fontSize = 14.sp,
-                    fontWeight = FontWeight.SemiBold,
-                    color = textColor,
-                    modifier = Modifier.padding(bottom = 8.dp)
-                )
-
-                Surface(
-                    modifier = Modifier.fillMaxWidth(),
-                    color = surfaceColor,
-                    shape = RoundedCornerShape(12.dp)
-                ) {
-                    Row(
-                        modifier = Modifier
-                            .fillMaxWidth()
-                            .padding(16.dp),
-                        verticalAlignment = Alignment.CenterVertically
-                    ) {
-                        Text(
-                            text = "@${user.username}",
-                            fontSize = 16.sp,
-                            color = textColor,
-                            modifier = Modifier.weight(1f)
-                        )
-                        IconButton(
-                            onClick = { /* TODO: Copy to clipboard */ }
-                        ) {
-                            Icon(
-                                imageVector = Icons.Outlined.ContentCopy,
-                                contentDescription = "Copy",
-                                tint = secondaryTextColor,
-                                modifier = Modifier.size(20.dp)
-                            )
-                        }
-                    }
-                }
-
-                Text(
-                    text = "Username for search user or send message.",
-                    fontSize = 12.sp,
-                    color = secondaryTextColor,
-                    modifier = Modifier.padding(horizontal = 8.dp, vertical = 8.dp),
-                    lineHeight = 16.sp
-                )
-
+        // Scrollable content
+        LazyColumn(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(top = with(density) { (expandedHeightPx - scrollOffset).toDp() })
+        ) {
+            item {
                 Spacer(modifier = Modifier.height(16.dp))
-            }
 
-            // Public Key Section
-            Text(
-                text = "Public Key",
-                fontSize = 14.sp,
-                fontWeight = FontWeight.SemiBold,
-                color = textColor,
-                modifier = Modifier.padding(bottom = 8.dp)
-            )
-
-            Surface(
-                modifier = Modifier.fillMaxWidth(),
-                color = surfaceColor,
-                shape = RoundedCornerShape(12.dp)
-            ) {
-                Row(
-                    modifier = Modifier
-                        .fillMaxWidth()
-                        .padding(16.dp),
-                    verticalAlignment = Alignment.CenterVertically
-                ) {
-                    Text(
-                        text = user.publicKey.take(20) + "..." + user.publicKey.takeLast(20),
-                        fontSize = 12.sp,
-                        color = textColor,
-                        modifier = Modifier.weight(1f)
+                // ═══════════════════════════════════════════════════════════
+                // 📋 INFO SECTION
+                // ═══════════════════════════════════════════════════════════
+                if (user.username.isNotBlank()) {
+                    TelegramSectionTitle(title = "Info", isDarkTheme = isDarkTheme)
+                    
+                    TelegramCopyField(
+                        value = "@${user.username}",
+                        fullValue = user.username,
+                        label = "Username",
+                        isDarkTheme = isDarkTheme
                     )
-                    IconButton(
-                        onClick = { /* TODO: Copy to clipboard */ }
-                    ) {
-                        Icon(
-                            imageVector = Icons.Outlined.ContentCopy,
-                            contentDescription = "Copy",
-                            tint = secondaryTextColor,
-                            modifier = Modifier.size(20.dp)
+                    
+                    Spacer(modifier = Modifier.height(24.dp))
+                }
+
+                // Public Key Section
+                TelegramSectionTitle(title = "Public Key", isDarkTheme = isDarkTheme)
+                
+                TelegramCopyField(
+                    value = user.publicKey.take(16) + "..." + user.publicKey.takeLast(6),
+                    fullValue = user.publicKey,
+                    label = "Public Key",
+                    isDarkTheme = isDarkTheme
+                )
+
+                Spacer(modifier = Modifier.height(24.dp))
+
+                // ═══════════════════════════════════════════════════════════
+                // 🚫 BLOCK SECTION
+                // ═══════════════════════════════════════════════════════════
+                TelegramSectionTitle(title = "Privacy", isDarkTheme = isDarkTheme)
+
+                TelegramBlockItem(
+                    isBlocked = isBlocked,
+                    onToggle = { isBlocked = !isBlocked },
+                    isDarkTheme = isDarkTheme
+                )
+
+                Spacer(modifier = Modifier.height(32.dp))
+            }
+        }
+
+        // ═══════════════════════════════════════════════════════════
+        // 🎨 COLLAPSING HEADER
+        // ═══════════════════════════════════════════════════════════
+        CollapsingOtherProfileHeader(
+            name = user.title.ifEmpty { "Unknown User" },
+            username = user.username,
+            publicKey = user.publicKey,
+            avatarColors = avatarColors,
+            collapseProgress = collapseProgress,
+            onBack = onBack,
+            isDarkTheme = isDarkTheme
+        )
+    }
+}
+// ═══════════════════════════════════════════════════════════
+// 🎯 COLLAPSING HEADER FOR OTHER PROFILE
+// ═══════════════════════════════════════════════════════════
+@Composable
+private fun CollapsingOtherProfileHeader(
+    name: String,
+    username: String,
+    publicKey: String,
+    avatarColors: AvatarColors,
+    collapseProgress: Float,
+    onBack: () -> Unit,
+    isDarkTheme: Boolean
+) {
+    val density = LocalDensity.current
+    val configuration = LocalConfiguration.current
+    val screenWidthDp = configuration.screenWidthDp.dp
+    
+    val statusBarHeight = WindowInsets.statusBars.asPaddingValues().calculateTopPadding()
+    
+    val expandedHeight = EXPANDED_HEADER_HEIGHT_OTHER + statusBarHeight
+    val collapsedHeight = COLLAPSED_HEADER_HEIGHT_OTHER + statusBarHeight
+    
+    val headerHeight = androidx.compose.ui.unit.lerp(expandedHeight, collapsedHeight, collapseProgress)
+    
+    // Avatar animation
+    val avatarCenterX = (screenWidthDp - AVATAR_SIZE_EXPANDED_OTHER) / 2
+    val avatarStartY = statusBarHeight + 32.dp
+    val avatarEndY = statusBarHeight - 60.dp
+    val avatarY = androidx.compose.ui.unit.lerp(avatarStartY, avatarEndY, collapseProgress)
+    val avatarSize = androidx.compose.ui.unit.lerp(AVATAR_SIZE_EXPANDED_OTHER, 0.dp, collapseProgress)
+    val avatarFontSize = androidx.compose.ui.unit.lerp(40.sp, 0.sp, collapseProgress)
+    
+    // Text animation
+    val textExpandedX = screenWidthDp / 2
+    val textCollapsedX = 48.dp + 12.dp
+    val textX = androidx.compose.ui.unit.lerp(textExpandedX, textCollapsedX, collapseProgress)
+    
+    val textExpandedY = statusBarHeight + 32.dp + AVATAR_SIZE_EXPANDED_OTHER + 48.dp
+    val textCollapsedY = statusBarHeight + (COLLAPSED_HEADER_HEIGHT_OTHER - 40.dp) / 2
+    val textY = androidx.compose.ui.unit.lerp(textExpandedY, textCollapsedY, collapseProgress)
+    
+    val nameFontSize = androidx.compose.ui.unit.lerp(24.sp, 17.sp, collapseProgress)
+    val usernameFontSize = androidx.compose.ui.unit.lerp(15.sp, 13.sp, collapseProgress)
+    
+    val headerColor = if (isDarkTheme) Color(0xFF2C2C2E) else Color.White
+    
+    Box(
+        modifier = Modifier
+            .fillMaxWidth()
+            .height(headerHeight)
+            .background(headerColor)
+    ) {
+        // Background color
+        Box(
+            modifier = Modifier
+                .fillMaxSize()
+                .background(headerColor)
+        )
+        
+        // Avatar
+        if (avatarSize > 0.dp) {
+            Box(
+                modifier = Modifier
+                    .offset {
+                        IntOffset(
+                            with(density) { avatarCenterX.toPx().roundToInt() },
+                            with(density) { avatarY.toPx().roundToInt() }
                         )
                     }
-                }
-            }
-
-            Text(
-                text = "This is user public key. If user haven't set a @username yet, you can send message using public key.",
-                fontSize = 12.sp,
-                color = secondaryTextColor,
-                modifier = Modifier.padding(horizontal = 8.dp, vertical = 8.dp),
-                lineHeight = 16.sp
-            )
-
-            Spacer(modifier = Modifier.height(24.dp))
-
-            // Block/Unblock Section
-            Surface(
-                modifier = Modifier.fillMaxWidth(),
-                color = surfaceColor,
-                shape = RoundedCornerShape(16.dp)
+                    .size(avatarSize)
+                    .clip(CircleShape)
+                    .background(avatarColors.backgroundColor),
+                contentAlignment = Alignment.Center
             ) {
-                Column {
-                    if (isBlocked) {
-                        ProfileNavigationItem(
-                            icon = Icons.Outlined.Block,
-                            iconBackground = Color(0xFF2E7D32), // green
-                            title = "Unblock User",
-                            subtitle = "Allow this user to message you",
-                            onClick = {
-                                isBlocked = false
-                                // TODO: Implement actual unblock logic
-                            },
-                            isDarkTheme = isDarkTheme,
-                            hideChevron = true,
-                            textColor = Color(0xFF2E7D32)
-                        )
-                    } else {
-                        ProfileNavigationItem(
-                            icon = Icons.Outlined.Block,
-                            iconBackground = if (isDarkTheme) Color(0xFFFF8787) else Color(0xFFEF4444),
-                            title = "Block this user",
-                            subtitle = "Prevent this user from messaging you",
-                            onClick = {
-                                isBlocked = true
-                                // TODO: Implement actual block logic
-                            },
-                            isDarkTheme = isDarkTheme,
-                            hideChevron = true,
-                            textColor = if (isDarkTheme) Color(0xFFFF8787) else Color(0xFFEF4444)
-                        )
-                    }
+                if (avatarFontSize.value > 0) {
+                    Text(
+                        text = getInitials(name),
+                        fontSize = avatarFontSize,
+                        fontWeight = FontWeight.Bold,
+                        color = avatarColors.textColor
+                    )
                 }
             }
-
-            Text(
-                text = if (isBlocked) {
-                    "If you want the user to be able to send you messages again, you can unblock them. You can block them later."
-                } else {
-                    "The person will no longer be able to message you if you block them. You can unblock them later."
-                },
-                fontSize = 12.sp,
-                color = secondaryTextColor,
-                modifier = Modifier.padding(horizontal = 8.dp, vertical = 8.dp),
-                lineHeight = 16.sp
+        }
+        
+        // Name and username
+        Box(
+            modifier = Modifier
+                .offset {
+                    IntOffset(
+                        with(density) { textX.toPx().roundToInt() },
+                        with(density) { textY.toPx().roundToInt() }
+                    )
+                }
+                .graphicsLayer {
+                    transformOrigin = androidx.compose.ui.graphics.TransformOrigin(
+                        pivotFractionX = if (collapseProgress > 0.5f) 0f else 0.5f,
+                        pivotFractionY = 0.5f
+                    )
+                }
+        ) {
+            Column(
+                horizontalAlignment = if (collapseProgress > 0.5f) Alignment.Start else Alignment.CenterHorizontally
+            ) {
+                Text(
+                    text = name,
+                    fontSize = nameFontSize,
+                    fontWeight = FontWeight.Bold,
+                    color = if (isDarkTheme) Color.White else Color.Black,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis
+                )
+                
+                if (username.isNotEmpty() && collapseProgress < 0.9f) {
+                    Spacer(modifier = Modifier.height(4.dp))
+                    Text(
+                        text = "@$username",
+                        fontSize = usernameFontSize,
+                        color = if (isDarkTheme) Color(0xFF8E8E93) else Color(0xFF666666),
+                        maxLines = 1,
+                        overflow = TextOverflow.Ellipsis,
+                        modifier = Modifier.graphicsLayer {
+                            alpha = 1f - (collapseProgress * 2f).coerceIn(0f, 1f)
+                        }
+                    )
+                }
+            }
+        }
+        
+        // Back button
+        IconButton(
+            onClick = onBack,
+            modifier = Modifier
+                .padding(top = statusBarHeight)
+                .padding(start = 4.dp, top = 4.dp)
+        ) {
+            Icon(
+                imageVector = Icons.Filled.ArrowBack,
+                contentDescription = "Back",
+                tint = if (isDarkTheme) Color.White else Color.Black
             )
-
-            Spacer(modifier = Modifier.height(32.dp))
         }
     }
 }
+
+// ═══════════════════════════════════════════════════════════
+// 🚫 BLOCK/UNBLOCK ITEM
+// ═══════════════════════════════════════════════════════════
+@Composable
+private fun TelegramBlockItem(
+    isBlocked: Boolean,
+    onToggle: () -> Unit,
+    isDarkTheme: Boolean
+) {
+    val textColor = if (isDarkTheme) Color.White else Color.Black
+    val iconColor = if (isBlocked) {
+        if (isDarkTheme) Color(0xFF66BB6A) else Color(0xFF4CAF50)
+    } else {
+        if (isDarkTheme) Color(0xFFFF8787) else Color(0xFFEF4444)
+    }
+
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .clickable(onClick = onToggle)
+            .padding(horizontal = 16.dp, vertical = 14.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Icon(
+            imageVector = Icons.Outlined.Block,
+            contentDescription = null,
+            tint = iconColor,
+            modifier = Modifier.size(24.dp)
+        )
+
+        Spacer(modifier = Modifier.width(20.dp))
+
+        Column(modifier = Modifier.weight(1f)) {
+            Text(
+                text = if (isBlocked) "Unblock User" else "Block User",
+                fontSize = 16.sp,
+                color = iconColor,
+                fontWeight = FontWeight.Medium
+            )
+            Spacer(modifier = Modifier.height(2.dp))
+            Text(
+                text = if (isBlocked) "Allow this user to message you" else "Prevent this user from messaging you",
+                fontSize = 13.sp,
+                color = if (isDarkTheme) Color(0xFF8E8E93) else Color(0xFF666666),
+                lineHeight = 16.sp
+            )
+        }
+    }
+}