package com.example.aiapp

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.HorizontalDivider
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.graphics.Color
import androidx.compose.ui.unit.dp

/**
 * A line across the transcript saying what left the session's context.
 *
 * Centred between two rules, because it is a divider rather than something anybody said. Two things
 * produce one -- a compaction and a clear -- and they are drawn the same way on purpose: to a
 * reader scrolling back, both mean "the session no longer has what is above this", and which of the
 * two it was is said by the words and the colour.
 *
 * The rules take [color] too, so the whole divider reads as one mark of one kind rather than a
 * coloured phrase sitting in an unrelated grey line.
 *
 * Written once here rather than styled at each of them, so the two cannot drift into looking like
 * different kinds of thing.
 */
@Composable
fun TranscriptDivider(text: String, color: Color, modifier: Modifier = Modifier) {
    Row(
        verticalAlignment = Alignment.CenterVertically,
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        modifier = modifier.fillMaxWidth().padding(vertical = 8.dp),
    ) {
        HorizontalDivider(Modifier.weight(1f), color = color)
        Text(text, style = MaterialTheme.typography.bodySmall, color = color)
        HorizontalDivider(Modifier.weight(1f), color = color)
    }
}

/**
 * The mark a clear leaves.
 *
 * Red, and no counts: a clear takes the conversation out of what the session is given, and unlike a
 * compaction it summarises nothing and measures nothing, so there is nothing to report but the
 * fact. Everything above stays on screen and stays scrollable -- the reader can see that, which is
 * why this does not say it.
 */
@Composable
fun ClearedRow(modifier: Modifier = Modifier) {
    TranscriptDivider("Context cleared", clearedColor, modifier)
}