Banksia/composeApp/src/commonMain/kotlin/moe/lava/banksia/ui/Searcher.kt

package moe.lava.banksia.ui

import androidx.compose.animation.core.animateDpAsState
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Clear
import androidx.compose.material.icons.filled.Search
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.ListItem
import androidx.compose.material3.ListItemDefaults
import androidx.compose.material3.SearchBar
import androidx.compose.material3.SearchBarDefaults
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableFloatStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.alpha
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import moe.lava.banksia.api.ptv.structures.ComposableIcon
import moe.lava.banksia.api.ptv.structures.PtvRoute
import kotlin.math.pow

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun Searcher(
    routes: List<PtvRoute>,
    expanded: Boolean,
    onExpandedChange: (Boolean) -> Unit,
    text: String,
    onTextChange: (String) -> Unit,
    onRouteChange: (PtvRoute?) -> Unit,
) {
    val animatedPadding by animateDpAsState(
        if (expanded) {
            0.dp
        } else {
            20.dp
        },
        label = "padding"
    )

    Box(modifier = Modifier.fillMaxSize()) {
        SearchBar(
            modifier = Modifier
                .align(Alignment.TopCenter)
                .fillMaxWidth()
                .padding(horizontal = animatedPadding),
            shadowElevation = 6.dp, // Elevation level 3
            inputField = {
                var backProgress by remember { mutableFloatStateOf(1f) }
                var backEdgeIsLeft by remember { mutableStateOf<Boolean?>(null) }
                val routeInfoOpacity by animateFloatAsState((1f - backProgress).pow(3))
                val slideState by animateDpAsState((50 * backProgress).dp)
                val slidePadding = when (backEdgeIsLeft) {
                    true -> PaddingValues(start = slideState)
                    false -> PaddingValues(end = slideState)
                    null -> PaddingValues()
                }

                SearchBarDefaults.InputField(
                    modifier = Modifier
                        .alpha(1f - routeInfoOpacity)
                        .padding(horizontal = 20.dp - animatedPadding),
                    query = text,
                    onQueryChange = onTextChange,
                    onSearch = {},
                    expanded = expanded,
                    onExpandedChange = onExpandedChange,
                    leadingIcon = { Icon(Icons.Default.Search, null) },
                    trailingIcon = {
                        if (expanded && text.isNotEmpty())
                            Icon(
                                imageVector = Icons.Default.Clear,
                                contentDescription = null,
                                modifier = Modifier.clickable { onTextChange("") }
                            )
                    }
                )
            },
            expanded = expanded,
            onExpandedChange = onExpandedChange,
        ) {
            LazyColumn(modifier = Modifier.fillMaxWidth()) {
                for (route in routes) {
                    if (!route.routeNumber.contains(text) &&
                        !route.routeName.lowercase().contains(text.lowercase()))
                        continue
                    item {
                        ListItem(
                            headlineContent = { Text(route.routeNumber.ifEmpty { route.routeName }) },
                            supportingContent = {
                                if (route.routeNumber.isNotEmpty()) {
                                    Text(route.routeName)
                                }
                            },
                            leadingContent = { route.routeType.ComposableIcon() },
                            colors = ListItemDefaults.colors(containerColor = Color.Transparent),
                            modifier = Modifier
                                .fillMaxWidth()
                                .padding(horizontal = 16.dp, vertical = 4.dp)
                                .clickable {
                                    onTextChange("")
                                    onExpandedChange(false)
                                    onRouteChange(route)
                                }
                        )
                    }
                }
            }
        }
    }
}