package soy.iko.opencode.ui.chat

import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.automirrored.filled.PlaylistPlay
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.ModalBottomSheet
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.role
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp
import androidx.compose.foundation.layout.Box
import soy.iko.opencode.data.model.Command
import soy.iko.opencode.R

/** Bottom sheet that lists slash-commands; selecting one invokes it. */
@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun CommandPickerSheet(
    commands: List<Command>,
    loading: Boolean,
    error: Boolean,
    onSelect: (Command) -> Unit,
    onRetry: () -> Unit,
    onDismiss: () -> Unit,
) {
    ModalBottomSheet(onDismissRequest = onDismiss) {
        Text(
            stringResource(R.string.commands),
            style = MaterialTheme.typography.titleMedium,
            modifier = Modifier.padding(start = 24.dp, end = 24.dp, bottom = 8.dp),
        )
        if (loading) {
            val loadingLabel = stringResource(R.string.loading)
            Box(
                modifier = Modifier.fillMaxWidth().padding(vertical = 24.dp),
                contentAlignment = Alignment.Center,
            ) {
                CircularProgressIndicator(Modifier.semantics { contentDescription = loadingLabel })
            }
        } else if (error && commands.isEmpty()) {
            Text(
                stringResource(R.string.load_failed),
                style = MaterialTheme.typography.bodyMedium,
                color = MaterialTheme.colorScheme.error,
                modifier = Modifier
                    .fillMaxWidth()
                    .clickable(role = Role.Button) { onRetry() }
                    .padding(horizontal = 24.dp, vertical = 16.dp),
            )
        } else if (commands.isEmpty()) {
            Text(
                stringResource(R.string.no_commands),
                style = MaterialTheme.typography.bodyMedium,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
                modifier = Modifier.padding(horizontal = 24.dp, vertical = 16.dp),
            )
        } else {
            LazyColumn(modifier = Modifier.fillMaxWidth().heightIn(max = 420.dp)) {
                items(commands, key = { it.name }) { cmd ->
                    Column(
                        modifier = Modifier
                            .fillMaxWidth()
                            .clickable(role = Role.Button) { onSelect(cmd); onDismiss() }
                            .padding(horizontal = 24.dp, vertical = 12.dp),
                    ) {
                        androidx.compose.foundation.layout.Row(
                            verticalAlignment = androidx.compose.ui.Alignment.CenterVertically,
                        ) {
                            Icon(Icons.AutoMirrored.Filled.PlaylistPlay, contentDescription = null)
                            Text(
                                "/${cmd.name}",
                                style = MaterialTheme.typography.bodyLarge,
                                modifier = Modifier.padding(start = 8.dp),
                            )
                        }
                        Text(
                            cmd.displayDescription,
                            style = MaterialTheme.typography.bodySmall,
                            color = MaterialTheme.colorScheme.onSurfaceVariant,
                            maxLines = 2,
                            overflow = TextOverflow.Ellipsis,
                            modifier = Modifier.padding(start = 28.dp, top = 2.dp),
                        )
                    }
                }
            }
        }
    }
}