package chats.presentation.components

import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
import androidx.compose.foundation.isSystemInDarkTheme
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.layout.ContentScale
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 coil.compose.AsyncImage
import core.utils.LinkMetadata
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext

private val linkMetadataCache = mutableMapOf<String, LinkMetadata>()

@Composable
fun LinkPreview(
    url: String,
    modifier: Modifier = Modifier,
    contentColor: Color = Color.White
) {
    var metadata by remember(url) { mutableStateOf<LinkMetadata?>(linkMetadataCache[url]) }
    var loading by remember(url) { mutableStateOf(metadata == null) }
    val context = LocalContext.current

    LaunchedEffect(url) {
        if (metadata != null) {
            loading = false
            return@LaunchedEffect
        }
        
        loading = true
        try {
            val client = okhttp3.OkHttpClient.Builder()
                .connectTimeout(10, java.util.concurrent.TimeUnit.SECONDS)
                .readTimeout(10, java.util.concurrent.TimeUnit.SECONDS)
                .build()
                
            val request = okhttp3.Request.Builder()
                .url("https://api.microlink.io?url=${java.net.URLEncoder.encode(url, "UTF-8")}")
                .header("User-Agent", "KnotMessenger/1.0 (Android)")
                .build()

            withContext(Dispatchers.IO) {
                client.newCall(request).execute().use { response ->
                    if (response.isSuccessful) {
                        val body = response.body?.string()
                        if (body != null) {
                            val json = com.google.gson.JsonParser.parseString(body).asJsonObject
                            if (json.has("status") && json.get("status").asString == "success") {
                                val data = json.getAsJsonObject("data")
                                
                                val title = data.get("title")?.takeIf { !it.isJsonNull }?.asString
                                val description = data.get("description")?.takeIf { !it.isJsonNull }?.asString
                                val imageUrl = data.getAsJsonObject("image")?.get("url")?.takeIf { !it.isJsonNull }?.asString
                                
                                if (title != null || description != null || imageUrl != null) {
                                  metadata = LinkMetadata(
                                      url = url,
                                      title = title,
                                      description = description,
                                      imageUrl = imageUrl
                                  )
                                  metadata?.let { linkMetadataCache[url] = it }
                                }
                                Unit
                            }
                            Unit
                        }
                        Unit
                    } else {
                        android.util.Log.e("LinkPreview", "API error: ${response.code} ${response.message}")
                    }
                }
                Unit
            }
        } catch (e: Exception) {
            android.util.Log.e("LinkPreview", "Failed to fetch metadata for $url", e)
        } finally {
            loading = false
        }
    }

    if (loading) {
        Text(
            text = "Загрузка предпросмотра...",
            style = MaterialTheme.typography.labelSmall,
            color = contentColor.copy(alpha = 0.5f),
            modifier = modifier.padding(vertical = 4.dp),
            fontStyle = androidx.compose.ui.text.font.FontStyle.Italic
        )
        return
    }

    val currentMetadata = metadata ?: LinkMetadata(url = url)

    Column(
        modifier = modifier
            .fillMaxWidth()
            .clip(RoundedCornerShape(8.dp))
            .background(Color.Black.copy(alpha = 0.2f))
            .clickable {
                try {
                    val intent = android.content.Intent(android.content.Intent.ACTION_VIEW, android.net.Uri.parse(url))
                    context.startActivity(intent)
                } catch (e: Exception) {}
            }
            .border(
                width = if (isSystemInDarkTheme()) 0.5.dp else 0.dp,
                color = Color.White.copy(alpha = 0.1f),
                shape = RoundedCornerShape(8.dp)
            )
    ) {
        Row(modifier = Modifier.height(IntrinsicSize.Min)) {
            Box(
                modifier = Modifier
                    .fillMaxHeight()
                    .width(3.dp)
                    .background(Color(0xFF3096E5))
            )
            
            Column(modifier = Modifier.padding(10.dp)) {
                val domain = remember(url) { 
                    try { java.net.URL(url).host.replace("www.", "") } catch (e: Exception) { "" }
                }
                
                Text(
                    text = domain,
                    style = MaterialTheme.typography.labelSmall,
                    color = Color(0xFF3096E5),
                    fontWeight = FontWeight.Bold,
                    modifier = Modifier.padding(bottom = 2.dp)
                )

                Text(
                    text = currentMetadata.title ?: url,
                    style = MaterialTheme.typography.bodyMedium,
                    fontWeight = FontWeight.Bold,
                    color = contentColor,
                    maxLines = 2,
                    overflow = TextOverflow.Ellipsis
                )

                currentMetadata.description?.let {
                    Text(
                        text = it,
                        style = MaterialTheme.typography.bodySmall,
                        color = contentColor.copy(alpha = 0.7f),
                        maxLines = 3,
                        overflow = TextOverflow.Ellipsis,
                        lineHeight = 16.sp
                    )
                }
            }
        }

        currentMetadata.imageUrl?.let {
            AsyncImage(
                model = it,
                contentDescription = null,
                modifier = Modifier
                    .fillMaxWidth()
                    .heightIn(max = 200.dp)
                    .clip(RoundedCornerShape(bottomStart = 8.dp, bottomEnd = 8.dp)),
                contentScale = ContentScale.Crop
            )
        }
    }
}