StudentResourcesScreen.kt

package com.pennapps.labs.pennmobile.studentresources

import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.expandVertically
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.animation.shrinkVertically
import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.navigationBarsPadding
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.rememberLazyListState
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.ArrowBack
import androidx.compose.material.icons.filled.KeyboardArrowDown
import androidx.compose.material.icons.filled.OpenInNew
import androidx.compose.material3.Card
import androidx.compose.material3.CardDefaults
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.material3.TopAppBarDefaults
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.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.rotate
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.pennapps.labs.pennmobile.R

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun StudentResourcesScreen(
    onBack: () -> Unit,
    modifier: Modifier = Modifier,
) {
    val categories = remember { StudentResourcesContent.categories }
    var expandedId by remember { mutableStateOf<String?>(null) }
    val listState = rememberLazyListState()

    LaunchedEffect(expandedId) {
        val id = expandedId ?: return@LaunchedEffect
        val categoryIndex = categories.indexOfFirst { it.id == id }
        if (categoryIndex >= 0) {
            listState.animateScrollToItem(
                index = categoryIndex + 1,
                scrollOffset = -16,
            )
        }
    }

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text("Student Resources") },
                navigationIcon = {
                    IconButton(onClick = onBack) {
                        Icon(Icons.Filled.ArrowBack, contentDescription = "Back")
                    }
                },
                colors =
                    TopAppBarDefaults.topAppBarColors(
                        containerColor = MaterialTheme.colorScheme.surface,
                    ),
            )
        },
        modifier = modifier,
    ) { innerPadding ->
        LazyColumn(
            state = listState,
            modifier =
                Modifier
                    .fillMaxSize()
                    .padding(innerPadding)
                    .navigationBarsPadding(),
            contentPadding =
                androidx.compose.foundation.layout.PaddingValues(
                    start = 16.dp,
                    end = 16.dp,
                    top = 8.dp,
                    bottom = 96.dp,
                ),
            verticalArrangement = Arrangement.spacedBy(12.dp),
        ) {
            item { HeaderCard() }
            categories.forEach { category ->
                item(key = category.id) {
                    CategoryCard(
                        category = category,
                        expanded = expandedId == category.id,
                        onToggle = {
                            expandedId =
                                if (expandedId == category.id) null else category.id
                        },
                    )
                }
            }
        }
    }
}

@Composable
fun StudentResourcesSection(modifier: Modifier = Modifier) {
    val categories = remember { StudentResourcesContent.categories }
    var expandedId by remember { mutableStateOf<String?>(null) }
    Column(
        modifier =
            modifier
                .fillMaxWidth()
                .padding(horizontal = 16.dp, vertical = 8.dp),
        verticalArrangement = Arrangement.spacedBy(12.dp),
    ) {
        HeaderCard()
        categories.forEach { category ->
            CategoryCard(
                category = category,
                expanded = expandedId == category.id,
                onToggle = {
                    expandedId = if (expandedId == category.id) null else category.id
                },
            )
        }
    }
}

@Composable
private fun HeaderCard(modifier: Modifier = Modifier) {
    Card(
        modifier = modifier.fillMaxWidth(),
        shape = RoundedCornerShape(16.dp),
        colors =
            CardDefaults.cardColors(
                containerColor = MaterialTheme.colorScheme.surface,
            ),
        elevation = CardDefaults.cardElevation(defaultElevation = 0.dp),
    ) {
        Column {
            Image(
                painter = painterResource(id = R.drawable.gym_ringe),
                contentDescription = null,
                contentScale = androidx.compose.ui.layout.ContentScale.Crop,
                modifier =
                    Modifier
                        .fillMaxWidth()
                        .height(140.dp)
                        .clip(RoundedCornerShape(topStart = 16.dp, topEnd = 16.dp)),
            )
            Row(
                modifier = Modifier.padding(horizontal = 16.dp, vertical = 16.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                Image(
                    painter = painterResource(id = R.drawable.ua_logo),
                    contentDescription = "Undergraduate Assembly logo",
                    contentScale = ContentScale.Crop,
                    modifier =
                        Modifier
                            .size(44.dp)
                            .clip(RoundedCornerShape(6.dp)),
                )
                Spacer(Modifier.width(12.dp))
                Column(Modifier.weight(1f)) {
                    Text(
                        text = "Undergraduate Assembly",
                        style = MaterialTheme.typography.titleMedium,
                        fontWeight = FontWeight.SemiBold,
                        color = MaterialTheme.colorScheme.onSurface,
                    )
                    Text(
                        text = "Student resources",
                        style = MaterialTheme.typography.bodyMedium,
                        color = MaterialTheme.colorScheme.onSurfaceVariant,
                    )
                }
                Icon(
                    imageVector = Icons.Filled.OpenInNew,
                    contentDescription = null,
                    tint = MaterialTheme.colorScheme.onSurfaceVariant,
                )
            }
            Text(
                text =
                    "This guide outlines the various resources and support " +
                        "available to Penn students, including when to use them and " +
                        "how to access them.",
                style = MaterialTheme.typography.bodyMedium,
                color = MaterialTheme.colorScheme.onSurface,
                modifier = Modifier.padding(horizontal = 16.dp, vertical = 8.dp),
            )
            Spacer(Modifier.height(8.dp))
        }
    }
}

@Composable
private fun CategoryCard(
    category: ResourceCategory,
    expanded: Boolean,
    onToggle: () -> Unit,
    modifier: Modifier = Modifier,
) {
    val rotation by animateFloatAsState(
        targetValue = if (expanded) 180f else 0f,
        label = "chevron-rotation",
    )

    Card(
        modifier = modifier.fillMaxWidth(),
        shape = RoundedCornerShape(16.dp),
        colors =
            CardDefaults.cardColors(
                containerColor =
                    if (expanded) {
                        MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.4f)
                    } else {
                        MaterialTheme.colorScheme.surface
                    },
            ),
        elevation = CardDefaults.cardElevation(defaultElevation = 0.dp),
    ) {
        Column {
            Row(
                modifier =
                    Modifier
                        .fillMaxWidth()
                        .clickable(onClick = onToggle)
                        .padding(horizontal = 16.dp, vertical = 18.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                Icon(
                    imageVector = category.icon,
                    contentDescription = null,
                    tint = MaterialTheme.colorScheme.onSurface,
                )
                Spacer(Modifier.width(16.dp))
                Text(
                    text = category.title,
                    style = MaterialTheme.typography.titleSmall,
                    fontWeight = FontWeight.SemiBold,
                    color = MaterialTheme.colorScheme.onSurface,
                    modifier = Modifier.weight(1f),
                )
                Icon(
                    imageVector = Icons.Filled.KeyboardArrowDown,
                    contentDescription = if (expanded) "Collapse" else "Expand",
                    tint = MaterialTheme.colorScheme.onSurfaceVariant,
                    modifier = Modifier.rotate(rotation),
                )
            }

            AnimatedVisibility(
                visible = expanded,
                enter = fadeIn() + expandVertically(),
                exit = fadeOut() + shrinkVertically(),
            ) {
                Column(
                    modifier =
                        Modifier.padding(
                            start = 16.dp,
                            end = 16.dp,
                            bottom = 16.dp,
                        ),
                    verticalArrangement = Arrangement.spacedBy(20.dp),
                ) {
                    category.resources.forEachIndexed { index, resource ->
                        ResourceItem(resource = resource)
                        if (index < category.resources.lastIndex) {
                            androidx.compose.material3.HorizontalDivider(
                                color = MaterialTheme.colorScheme.outlineVariant,
                            )
                        }
                    }
                }
            }
        }
    }
}