package com.example.aiapp

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.text.font.FontFamily
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp

/**
 * Whether [ref] names an image the server stored as one -- `<hex>.<extension>`, with an extension
 * from the list it writes -- rather than a file kept under its own name. Mirrors the server's
 * `media` table, which is the one other place the list lives.
 */
fun isImageRef(ref: String): Boolean = ref.substringAfterLast('.', "") in IMAGE_EXTENSIONS

private val IMAGE_EXTENSIONS = setOf("png", "jpg", "gif", "webp")

/**
 * The name a file was attached under: the ref less the hex the server put before it. The hex has no
 * dash in it, so the first one is the boundary however many the name has.
 */
fun attachmentName(ref: String): String = ref.substringAfter('-', ref)

/**
 * One attachment on a sent message, drawn as what it is: an image inline, a file as its name. A
 * file is not fetched -- there is nothing on this phone to open a trace with -- so the name is all
 * of it.
 */
@Composable
fun Attachment(
    settings: ServerSettings,
    sessionId: String,
    ref: String,
    onOpenImage: (String) -> Unit,
) {
    if (isImageRef(ref)) SessionImage(settings, sessionId, ref, onOpenImage)
    else
        FileName(
            attachmentName(ref),
            Modifier.clip(MaterialTheme.shapes.extraSmall)
                .background(rawSurface)
                .padding(horizontal = 8.dp, vertical = 4.dp),
        )
}

/**
 * A file's name, one line, in the face names are read in. Overlong names lose their middle: a name
 * is identified by both ends -- what it is at the front, what kind at the back.
 */
@Composable
fun FileName(name: String, modifier: Modifier = Modifier) {
    Text(
        name,
        modifier = modifier,
        style = MaterialTheme.typography.bodySmall,
        fontFamily = FontFamily.Monospace,
        maxLines = 1,
        overflow = TextOverflow.MiddleEllipsis,
    )
}