package com.schoolapp.cleverclass

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.BorderStroke
import androidx.compose.foundation.clickable
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.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Add
import androidx.compose.material.icons.filled.ArrowBack
import androidx.compose.material.icons.filled.Close
import androidx.compose.material.icons.filled.KeyboardArrowDown
import androidx.compose.material.icons.filled.KeyboardArrowUp
import androidx.compose.material3.BottomAppBar
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.FloatingActionButton
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.material3.TopAppBarDefaults
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.ui.Alignment.Companion.CenterVertically
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.schoolapp.cleverclass.ui.theme.CleverClassTheme
import com.schoolapp.cleverclass.ui.theme.TextOnColouredButton

class FachActivity : ComponentActivity() {
    companion object {
        const val ARGUMENT_KEY = "argument_key"
    }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // get subject argument from NotenActivity
        val name = intent.getStringExtra(ARGUMENT_KEY) ?: "missing subject"

        setContent {
            CleverClassTheme {
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colorScheme.background
                ) {
                    FachContent(activity = this, name = name)
                }
            }
        }
    }
}

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun FachContent(activity: ComponentActivity, name : String){
    Scaffold(
        topBar = {
            TopAppBar(
                colors = TopAppBarDefaults.centerAlignedTopAppBarColors(MaterialTheme.colorScheme.primaryContainer),
                title = {
                    Text(text = name,
                        style = MaterialTheme.typography.headlineSmall
                    )},
                navigationIcon = {
                    IconButton(onClick = { activity.finish() }) {
                        Icon(
                            imageVector = Icons.Filled.ArrowBack,
                            contentDescription = null,
                            modifier = Modifier.size(28.dp)
                        )
                    }
                },
                modifier = Modifier.fillMaxWidth()
            )
        },
        bottomBar = {
            BottomAppBar(
                containerColor = MaterialTheme.colorScheme.primaryContainer,
                modifier = Modifier
                    .fillMaxWidth()
                    .height(64.dp)
            ) {
                Row (modifier = Modifier
                    .fillMaxWidth()
                    .align(CenterVertically)){
                    Spacer(modifier = Modifier.width(16.dp))
                    Text(text = "Schnitt:",
                        style = MaterialTheme.typography.headlineSmall)
                    Spacer(modifier = Modifier.weight(1f))
                    Text(text = "Ø0.00",
                        style = MaterialTheme.typography.headlineSmall)
                    Spacer(modifier = Modifier.width(16.dp))
                }
            }
        },
        floatingActionButton = {
            FloatingActionButton(onClick = { /*TODO*/ },
            shape = RoundedCornerShape(40)
            ) {
            Icon(imageVector = Icons.Filled.Add,
                contentDescription = null,
                modifier = Modifier.size(32.dp))
        }}
    ) {innerPadding ->
        Column(modifier = Modifier
            .fillMaxWidth()
            .padding(innerPadding))
        {
            NotenPrefab()
            NotenPrefab()
        }
    }
}

@Preview
@Composable
fun NotenPrefab(){
    val color = Color(0xFFB2FF59)
    var typeExpanded by remember {
        mutableStateOf(false)
    }
    var gradeExpanded by remember {
        mutableStateOf(false)
    }
    var weightExpanded by remember {
        mutableStateOf(false)
    }

    // Background
    Surface(
        shape = RoundedCornerShape(20),
        color = color,
        modifier = Modifier
            .fillMaxWidth()
            .height(128.dp)
            .padding(start = 16.dp, end = 16.dp, top = 16.dp)
    ) {
        // Content
        Column(modifier = Modifier.padding(16.dp)) {
            Row {
                // Type
                Surface(
                    shape = RoundedCornerShape(10),
                    color = color,
                    border = BorderStroke(2.dp, TextOnColouredButton),
                    modifier = Modifier
                        .size(width = 128.dp, height = 32.dp)
                        .clickable { typeExpanded = !typeExpanded }
                ) {
                    Row(verticalAlignment = CenterVertically,
                        modifier = Modifier.padding(4.dp)) {
                        Text(text = "Typ", color = TextOnColouredButton, style = MaterialTheme.typography.labelMedium)
                        DropdownMenu(expanded = typeExpanded, onDismissRequest = { typeExpanded = false }) {
                            DropdownMenuItem(text = { Text(text = "Test") }, onClick = { /*TODO*/ })
                        }
                        Spacer(modifier = Modifier.weight(1f))
                        Icon(imageVector = if (typeExpanded) Icons.Filled.KeyboardArrowUp else Icons.Filled.KeyboardArrowDown,
                            contentDescription = null,
                            tint = TextOnColouredButton)
                    }
                }
                // Delete
                Spacer(modifier = Modifier.weight(1f))
                Icon(
                    imageVector = Icons.Filled.Close,
                    contentDescription = null,
                    tint = TextOnColouredButton,
                    modifier = Modifier
                        .size(28.dp)
                        .clickable { /*TODO*/ }
                )
            }

            Spacer(modifier = Modifier.weight(1f))

            Row (verticalAlignment = CenterVertically) {
                // Grade
                Text(text = "Note:", color = TextOnColouredButton, style = MaterialTheme.typography.labelMedium)
                Spacer(modifier = Modifier.width(8.dp))
                Surface(
                    shape = RoundedCornerShape(10),
                    color = color,
                    border = BorderStroke(2.dp, TextOnColouredButton),
                    modifier = Modifier
                        .size(width = 48.dp, height = 32.dp)
                        .clickable { gradeExpanded = !gradeExpanded }
                ) {
                    Row(verticalAlignment = CenterVertically,
                        modifier = Modifier.padding(4.dp)) {
                        Text(text = "1", color = TextOnColouredButton, style = MaterialTheme.typography.labelMedium)
                        DropdownMenu(expanded = gradeExpanded, onDismissRequest = { gradeExpanded = false }) {
                            DropdownMenuItem(text = { Text(text = "Test") }, onClick = { /*TODO*/ })
                        }
                        Spacer(modifier = Modifier.weight(1f))
                        Icon(imageVector = if (gradeExpanded) Icons.Filled.KeyboardArrowUp else Icons.Filled.KeyboardArrowDown, contentDescription = null, tint = TextOnColouredButton)
                    }
                }
                // Weight
                Spacer(modifier = Modifier.width(16.dp))
                Text(text = "Gewichtung:", color = TextOnColouredButton, style = MaterialTheme.typography.labelMedium)
                Spacer(modifier = Modifier.width(8.dp))
                Surface(
                    shape = RoundedCornerShape(10),
                    color = color,
                    border = BorderStroke(2.dp, TextOnColouredButton),
                    modifier = Modifier
                        .size(width = 64.dp, height = 32.dp)
                        .clickable { weightExpanded = !weightExpanded }
                ) {
                    Row(verticalAlignment = CenterVertically,
                        modifier = Modifier.padding(4.dp)) {
                        Text(text = "1x", color = TextOnColouredButton, style = MaterialTheme.typography.labelMedium)
                        DropdownMenu(expanded = weightExpanded, onDismissRequest = { weightExpanded = false }) {
                            DropdownMenuItem(text = { Text(text = "Test") }, onClick = { /*TODO*/ })
                        }
                        Spacer(modifier = Modifier.weight(1f))
                        Icon(imageVector = if (weightExpanded) Icons.Filled.KeyboardArrowUp else Icons.Filled.KeyboardArrowDown, contentDescription = null, tint = TextOnColouredButton)
                    }
                }
            }
        }
    }
}