package com.socialapp.presentation.ui.screens

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Favorite
import androidx.compose.material.icons.filled.FavoriteBorder
import androidx.compose.material.icons.filled.ChatBubbleOutline
import androidx.compose.material.icons.filled.Share
import androidx.compose.material3.Button
import androidx.compose.material3.ButtonDefaults
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.layout.ContentScale
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 coil.compose.AsyncImage
import com.socialapp.data.api.Post
import com.socialapp.presentation.ui.theme.AccentMagenta
import com.socialapp.presentation.viewmodel.PostViewModel

@Composable
fun ReelScreen(
    viewModel: PostViewModel = hiltViewModel(),
    onBackClick: () -> Unit = {},
    onProfileClick: (Int) -> Unit = {}
) {
    val posts = viewModel.posts.value
    
    if (posts.isEmpty()) {
        Box(
            modifier = Modifier
                .fillMaxSize()
                .background(MaterialTheme.colorScheme.background),
            contentAlignment = Alignment.Center
        ) {
            Text("No reels available", color = MaterialTheme.colorScheme.onBackground)
        }
        return
    }

    val reel = posts.first()

    Box(
        modifier = Modifier
            .fillMaxSize()
            .background(MaterialTheme.colorScheme.background)
    ) {
        // Video Content - Full Screen
        Box(
            modifier = Modifier
                .fillMaxSize()
                .background(MaterialTheme.colorScheme.onBackground.copy(alpha = 0.1f))
        ) {
            if (!reel.mediaUrl.isNullOrEmpty()) {
                AsyncImage(
                    model = reel.mediaUrl.firstOrNull(),
                    contentDescription = "Reel Content",
                    modifier = Modifier.fillMaxSize(),
                    contentScale = ContentScale.Crop
                )
            }
        }

        // Header
        Row(
            modifier = Modifier
                .fillMaxWidth()
                .padding(16.dp),
            horizontalArrangement = androidx.compose.foundation.layout.Arrangement.SpaceBetween,
            verticalAlignment = Alignment.CenterVertically
        ) {
            IconButton(onClick = onBackClick, modifier = Modifier.size(36.dp)) {
                Icon(
                    imageVector = Icons.Default.FavoriteBorder,
                    contentDescription = "Back",
                    tint = MaterialTheme.colorScheme.background,
                    modifier = Modifier.size(20.dp)
                )
            }
            Row {
                Text(
                    text = "Following",
                    fontSize = 14.sp,
                    color = MaterialTheme.colorScheme.background,
                    fontWeight = FontWeight.SemiBold
                )
                Spacer(modifier = Modifier.width(24.dp))
                Text(
                    text = "Trending",
                    fontSize = 14.sp,
                    color = MaterialTheme.colorScheme.background.copy(alpha = 0.6f)
                )
            }
        }

        // Right Side Action Bar
        Column(
            modifier = Modifier
                .align(Alignment.CenterEnd)
                .padding(end = 16.dp),
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            IconButton(
                onClick = { /* Like reel */ },
                modifier = Modifier.size(48.dp)
            ) {
                Icon(
                    imageVector = Icons.Default.FavoriteBorder,
                    contentDescription = "Like",
                    tint = MaterialTheme.colorScheme.background,
                    modifier = Modifier.size(24.dp)
                )
            }
            Text(
                text = "${reel.likesCount}",
                fontSize = 12.sp,
                color = MaterialTheme.colorScheme.background,
                fontWeight = FontWeight.SemiBold
            )
            Spacer(modifier = Modifier.height(12.dp))

            IconButton(
                onClick = { /* Comment */ },
                modifier = Modifier.size(48.dp)
            ) {
                Icon(
                    imageVector = Icons.Default.ChatBubbleOutline,
                    contentDescription = "Comment",
                    tint = MaterialTheme.colorScheme.background,
                    modifier = Modifier.size(24.dp)
                )
            }
            Text(
                text = "${reel.commentsCount}",
                fontSize = 12.sp,
                color = MaterialTheme.colorScheme.background,
                fontWeight = FontWeight.SemiBold
            )
            Spacer(modifier = Modifier.height(12.dp))

            IconButton(
                onClick = { /* Share */ },
                modifier = Modifier.size(48.dp)
            ) {
                Icon(
                    imageVector = Icons.Default.Share,
                    contentDescription = "Share",
                    tint = MaterialTheme.colorScheme.background,
                    modifier = Modifier.size(24.dp)
                )
            }
        }

        // Bottom User Info
        Column(
            modifier = Modifier
                .align(Alignment.BottomStart)
                .fillMaxWidth()
                .padding(16.dp)
        ) {
            Row(
                verticalAlignment = Alignment.CenterVertically,
                modifier = Modifier.fillMaxWidth()
            ) {
                Box(
                    modifier = Modifier
                        .size(48.dp)
                        .clip(CircleShape)
                        .background(AccentMagenta.copy(alpha = 0.3f)),
                    contentAlignment = Alignment.Center
                ) {
                    Text(
                        text = reel.username.firstOrNull()?.toString() ?: "U",
                        fontSize = 20.sp,
                        fontWeight = FontWeight.Bold,
                        color = AccentMagenta
                    )
                }
                Spacer(modifier = Modifier.width(12.dp))
                
                Column(modifier = Modifier.weight(1f)) {
                    Text(
                        text = reel.username,
                        fontSize = 14.sp,
                        fontWeight = FontWeight.SemiBold,
                        color = MaterialTheme.colorScheme.background
                    )
                    Text(
                        text = "Just now",
                        fontSize = 12.sp,
                        color = MaterialTheme.colorScheme.background.copy(alpha = 0.7f)
                    )
                }

                Button(
                    onClick = { /* Follow */ },
                    modifier = Modifier
                        .height(36.dp)
                        .width(80.dp),
                    colors = ButtonDefaults.buttonColors(
                        containerColor = AccentMagenta
                    ),
                    shape = RoundedCornerShape(16.dp)
                ) {
                    Text("Follow", fontSize = 12.sp, fontWeight = FontWeight.SemiBold)
                }
            }

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

            if (reel.content.isNotEmpty()) {
                Text(
                    text = reel.content,
                    fontSize = 13.sp,
                    color = MaterialTheme.colorScheme.background,
                    fontWeight = FontWeight.Medium
                )
            }
        }
    }
}