amethyst/app/src/main/java/com/vitorpamplona/amethyst/ui/actions/NewPostView.kt

package com.vitorpamplona.amethyst.ui.actions

import androidx.compose.foundation.border
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxHeight
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.material.Button
import androidx.compose.material.ButtonDefaults
import androidx.compose.material.MaterialTheme
import androidx.compose.material.OutlinedTextField
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.compose.material.TextFieldDefaults
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.Alignment
import androidx.compose.ui.ExperimentalComposeUiApi
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.focus.onFocusChanged
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.platform.LocalSoftwareKeyboardController
import androidx.compose.ui.text.input.KeyboardCapitalization
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.compose.ui.window.Dialog
import androidx.compose.ui.window.DialogProperties
import androidx.lifecycle.viewmodel.compose.viewModel
import coil.compose.AsyncImage
import com.google.accompanist.flowlayout.FlowRow
import com.vitorpamplona.amethyst.model.Account
import com.vitorpamplona.amethyst.model.Note
import com.vitorpamplona.amethyst.ui.components.TagLink
import com.vitorpamplona.amethyst.ui.components.UrlPreview
import com.vitorpamplona.amethyst.ui.components.imageExtension
import com.vitorpamplona.amethyst.ui.components.isValidURL
import com.vitorpamplona.amethyst.ui.components.noProtocolUrlValidator
import com.vitorpamplona.amethyst.ui.components.tagIndex
import com.vitorpamplona.amethyst.ui.navigation.UploadFromGallery
import kotlinx.coroutines.delay
import nostr.postr.events.TextNoteEvent


@OptIn(ExperimentalComposeUiApi::class)
@Composable
fun NewPostView(onClose: () -> Unit, replyingTo: Note? = null, account: Account) {
    val postViewModel: NewPostViewModel = viewModel<NewPostViewModel>().apply {
        this.replyingTo = replyingTo
        this.account = account
    }

    val context = LocalContext.current

    // initialize focus reference to be able to request focus programmatically
    val focusRequester = FocusRequester()
    val keyboardController = LocalSoftwareKeyboardController.current

    LaunchedEffect(Unit) {
        delay(100)
        focusRequester.requestFocus()
    }

    Dialog(
        onDismissRequest = { onClose() },
        properties = DialogProperties(
            usePlatformDefaultWidth = false,
            dismissOnClickOutside = false
        )
    ) {
        Surface(
            modifier = Modifier
                .fillMaxWidth()
                .fillMaxHeight()
        ) {
            Column(
                modifier = Modifier.padding(10.dp)
            ) {
                Row(
                    modifier = Modifier
                        .fillMaxWidth(),
                    horizontalArrangement = Arrangement.SpaceBetween,
                    verticalAlignment = Alignment.CenterVertically
                ) {
                    CloseButton(onCancel = {
                        postViewModel.cancel()
                        onClose()
                    })

                    UploadFromGallery {
                        postViewModel.upload(it, context)
                    }

                    PostButton(
                        onPost = {
                            postViewModel.sendPost()
                            onClose()
                        }
                    )
                }

                if (replyingTo != null && replyingTo.event is TextNoteEvent) {
                    Row(
                        verticalAlignment = Alignment.CenterVertically,
                    ) {
                        val replyList = replyingTo.replyTo!!.plus(replyingTo).joinToString(", ",  "", "", 2) { it.idDisplayHex }
                        val withList = replyingTo.mentions!!.plus(replyingTo.author!!).joinToString(", ",  "", "", 2) { it.toBestDisplayName() }

                        Text(
                            "in reply to ${replyList} with ${withList}",
                            fontSize = 13.sp,
                            color = MaterialTheme.colors.onSurface.copy(alpha = 0.32f)
                        )
                    }
                }

                OutlinedTextField(
                    value = postViewModel.message,
                    onValueChange = {
                        postViewModel.message = it
                        postViewModel.urlPreview = postViewModel.findUrlInMessage()
                    },
                    keyboardOptions = KeyboardOptions.Default.copy(
                        capitalization = KeyboardCapitalization.Sentences
                    ),
                    modifier = Modifier
                        .fillMaxWidth()
                        .border(
                            width = 1.dp,
                            color = MaterialTheme.colors.surface,
                            shape = RoundedCornerShape(8.dp)
                        )
                        .focusRequester(focusRequester)
                        .onFocusChanged {
                            if (it.isFocused) {
                                keyboardController?.show()
                            }
                        },
                    placeholder = {
                        Text(
                            text = "What's on your mind?",
                            color = MaterialTheme.colors.onSurface.copy(alpha = 0.32f)
                        )
                    },
                    colors = TextFieldDefaults
                        .outlinedTextFieldColors(
                            unfocusedBorderColor = Color.Transparent,
                            focusedBorderColor = Color.Transparent
                        )
                )

                val myUrlPreview = postViewModel.urlPreview
                if (myUrlPreview != null) {
                    Column(modifier = Modifier.padding(top = 5.dp)) {
                        val removedParamsFromUrl = myUrlPreview.split("?")[0].toLowerCase()
                        if (imageExtension.matcher(removedParamsFromUrl).matches()) {
                            AsyncImage(
                                model = myUrlPreview,
                                contentDescription = myUrlPreview,
                                contentScale = ContentScale.FillWidth,
                                modifier = Modifier
                                    .padding(top = 4.dp)
                                    .fillMaxWidth()
                                    .clip(shape = RoundedCornerShape(15.dp))
                                    .border(
                                        1.dp,
                                        MaterialTheme.colors.onSurface.copy(alpha = 0.12f),
                                        RoundedCornerShape(15.dp)
                                    )
                            )
                        } else {
                            UrlPreview("https://$myUrlPreview", myUrlPreview, false)
                        }
                    }
                }
            }
        }
    }
}

@Composable
private fun CloseButton(onCancel: () -> Unit) {
    Button(
        onClick = {
            onCancel()
        },
        shape = RoundedCornerShape(20.dp),
        colors = ButtonDefaults
            .buttonColors(
                backgroundColor = Color.Gray
            )
    ) {
        Text(text = "Cancel", color = Color.White)
    }
}

@Composable
private fun PostButton(onPost: () -> Unit = {}) {
    Button(
        onClick = {
            onPost()
        },
        shape = RoundedCornerShape(20.dp),
        colors = ButtonDefaults
            .buttonColors(
                backgroundColor = MaterialTheme.colors.primary
            )
    ) {
        Text(text = "Post", color = Color.White)
    }
}