package com.rizoma.orbita.ui

import androidx.activity.compose.BackHandler
import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
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.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicTextField
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.graphics.SolidColor
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.input.ImeAction
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.compose.ui.window.Dialog
import androidx.lifecycle.viewmodel.compose.viewModel
import androidx.compose.runtime.collectAsState
import com.rizoma.orbita.R
import com.rizoma.orbita.model.AppNode
import com.rizoma.orbita.ui.theme.NeonCian
import com.rizoma.orbita.ui.theme.NeonRosa
import com.rizoma.orbita.ui.theme.NeonVerde
import com.rizoma.orbita.ui.theme.Superficie
import com.rizoma.orbita.ui.theme.Tenue
import com.rizoma.orbita.ui.theme.Vacio

@Composable
fun OrbitApp(vm: OrbitaViewModel = viewModel()) {
    val nodes by vm.nodes.collectAsState()
    var searchOpen by remember { mutableStateOf(false) }
    var menuNode by remember { mutableStateOf<AppNode?>(null) }

    // Como launcher: "atrás" cierra la búsqueda o no hace nada (nunca sale al sistema).
    BackHandler(enabled = true) {
        if (searchOpen) searchOpen = false
    }

    Box(Modifier.fillMaxSize().background(Vacio)) {
        OrbitLayout(
            nodes = nodes,
            onLaunch = vm::launch,
            onLongPress = { menuNode = it },
            onCenterTap = { searchOpen = true },
        )

        if (searchOpen) {
            SearchOverlay(
                nodes = nodes,
                onLaunch = {
                    vm.launch(it)
                    searchOpen = false
                },
                onClose = { searchOpen = false },
            )
        }

        menuNode?.let { node ->
            NodeMenu(
                node = node,
                onPin = { vm.togglePin(node); menuNode = null },
                onInfo = { vm.openInfo(node); menuNode = null },
                onUninstall = { vm.uninstall(node); menuNode = null },
                onDismiss = { menuNode = null },
            )
        }
    }
}

@Composable
private fun SearchOverlay(
    nodes: List<AppNode>,
    onLaunch: (AppNode) -> Unit,
    onClose: () -> Unit,
) {
    var query by remember { mutableStateOf("") }
    val filtered = remember(query, nodes) {
        if (query.isBlank()) nodes
        else nodes.filter { it.label.contains(query.trim(), ignoreCase = true) }
    }
    val focus = remember { FocusRequester() }
    LaunchedEffect(Unit) { focus.requestFocus() }

    Box(
        Modifier
            .fillMaxSize()
            .background(Vacio.copy(alpha = 0.97f))
            // Tocar el fondo cierra; el contenido absorbe sus propios toques.
            .clickable(
                interactionSource = remember { MutableInteractionSource() },
                indication = null,
                onClick = onClose,
            )
    ) {
        Column(
            Modifier
                .fillMaxSize()
                .padding(horizontal = 28.dp)
                .padding(top = 96.dp)
        ) {
            BasicTextField(
                value = query,
                onValueChange = { query = it },
                singleLine = true,
                textStyle = TextStyle(color = NeonVerde, fontSize = 26.sp, fontWeight = FontWeight.Light),
                cursorBrush = SolidColor(NeonRosa),
                keyboardOptions = androidx.compose.foundation.text.KeyboardOptions(imeAction = ImeAction.Search),
                modifier = Modifier.fillMaxWidth().focusRequester(focus),
                decorationBox = { inner ->
                    if (query.isEmpty()) {
                        Text(
                            text = stringResource(R.string.search_hint),
                            color = Tenue,
                            fontSize = 26.sp,
                            fontWeight = FontWeight.Light,
                        )
                    }
                    inner()
                },
            )
            Spacer(Modifier.height(4.dp))
            Box(Modifier.fillMaxWidth().height(1.dp).background(NeonVerde.copy(alpha = 0.4f)))
            Spacer(Modifier.height(16.dp))

            LazyColumn(Modifier.fillMaxSize()) {
                items(filtered, key = { it.key }) { node ->
                    Row(
                        Modifier
                            .fillMaxWidth()
                            .clickable { onLaunch(node) }
                            .padding(vertical = 8.dp),
                        verticalAlignment = Alignment.CenterVertically,
                    ) {
                        Image(
                            bitmap = node.icon,
                            contentDescription = node.label,
                            modifier = Modifier.size(40.dp).clip(CircleShape),
                        )
                        Spacer(Modifier.width(16.dp))
                        Text(
                            text = node.label,
                            color = androidx.compose.ui.graphics.Color.White,
                            fontSize = 16.sp,
                            maxLines = 1,
                            overflow = TextOverflow.Ellipsis,
                        )
                    }
                }
            }
        }
    }
}

@Composable
private fun NodeMenu(
    node: AppNode,
    onPin: () -> Unit,
    onInfo: () -> Unit,
    onUninstall: () -> Unit,
    onDismiss: () -> Unit,
) {
    Dialog(onDismissRequest = onDismiss) {
        Surface(
            color = Superficie,
            shape = RoundedCornerShape(20.dp),
        ) {
            Column(Modifier.width(240.dp).padding(vertical = 10.dp)) {
                Text(
                    text = node.label,
                    color = androidx.compose.ui.graphics.Color.White,
                    fontSize = 15.sp,
                    fontWeight = FontWeight.Medium,
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis,
                    modifier = Modifier.padding(horizontal = 20.dp, vertical = 10.dp),
                )
                MenuRow(
                    label = stringResource(if (node.pinned) R.string.menu_unpin else R.string.menu_pin),
                    accent = NeonRosa,
                    onClick = onPin,
                )
                MenuRow(label = stringResource(R.string.menu_info), accent = NeonCian, onClick = onInfo)
                MenuRow(label = stringResource(R.string.menu_uninstall), accent = NeonRosa, onClick = onUninstall)
            }
        }
    }
}

@Composable
private fun MenuRow(label: String, accent: androidx.compose.ui.graphics.Color, onClick: () -> Unit) {
    Row(
        Modifier
            .fillMaxWidth()
            .clickable(onClick = onClick)
            .padding(horizontal = 20.dp, vertical = 14.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        Box(Modifier.size(6.dp).clip(CircleShape).background(accent))
        Spacer(Modifier.width(14.dp))
        Text(text = label, color = androidx.compose.ui.graphics.Color.White, fontSize = 15.sp)
    }
}