package com.vitorpamplona.amethyst.ui.components

import androidx.compose.animation.Crossfade
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.ClickableText
import androidx.compose.material.LocalTextStyle
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
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.LocalUriHandler
import androidx.compose.ui.text.AnnotatedString
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp
import coil.compose.AsyncImage
import com.baha.url.preview.BahaUrlPreview
import com.baha.url.preview.IUrlPreviewCallback
import com.baha.url.preview.UrlInfoItem


@Composable
fun UrlPreview(url: String, urlText: String) {
  var urlPreviewState by remember { mutableStateOf<UrlPreviewState>(UrlPreviewState.Loading) }

  // Doesn't use a viewModel because of viewModel reusing issues (too many UrlPreview are created).
  LaunchedEffect(urlPreviewState) {
    if (urlPreviewState == UrlPreviewState.Loading) {
      val urlPreview = BahaUrlPreview(url, object : IUrlPreviewCallback {
        override fun onComplete(urlInfo: UrlInfoItem) {
          if (urlInfo.allFetchComplete() && urlInfo.url == url)
            urlPreviewState = UrlPreviewState.Loaded(urlInfo)
          else
            urlPreviewState = UrlPreviewState.Empty
        }

        override fun onFailed(throwable: Throwable) {
          urlPreviewState = UrlPreviewState.Error("Error parsing preview for ${url}: ${throwable.message}")
        }
      })

      urlPreview.fetchUrlPreview()
    }
  }

  val uri = LocalUriHandler.current

  Crossfade(targetState = urlPreviewState) { state ->
    when (state) {
      is UrlPreviewState.Loaded -> {
        Row(
          modifier = Modifier.clickable { runCatching { uri.openUri(url) } }
            .clip(shape = RoundedCornerShape(15.dp))
            .border(1.dp, MaterialTheme.colors.onSurface.copy(alpha = 0.12f), RoundedCornerShape(15.dp))
        ) {
          Column {
            AsyncImage(
              model = state.previewInfo.image,
              contentDescription = "Profile Image",
              contentScale = ContentScale.FillWidth,
              modifier = Modifier.fillMaxWidth()
            )

            Text(
              text = state.previewInfo.title,
              style = MaterialTheme.typography.body2,
              modifier = Modifier.fillMaxWidth().padding(start = 10.dp, end = 10.dp, top= 10.dp),
              maxLines = 1,
              overflow = TextOverflow.Ellipsis
            )

            Text(
              text = state.previewInfo.description,
              style = MaterialTheme.typography.caption,
              modifier = Modifier
                .fillMaxWidth()
                .padding(start = 10.dp, end = 10.dp, bottom = 10.dp),
              color = Color.Gray,
              maxLines = 3,
              overflow = TextOverflow.Ellipsis
            )
          }
        }
      }
      else -> {
        ClickableText(
          text = AnnotatedString("$urlText "),
          onClick = { runCatching { uri.openUri(url) } },
          style = LocalTextStyle.current.copy(color = MaterialTheme.colors.primary),
        )
      }
    }
  }

}