package com.schoolapp.cleverclass

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Column
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.rememberScrollState
import androidx.compose.foundation.verticalScroll
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.ArrowBack
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
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.ui.Modifier
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.schoolapp.cleverclass.ui.theme.CleverClassTheme

class AboutActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            CleverClassTheme {
                Surface(modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colorScheme.background) {
                    AboutContent(activity = this)
                }
            }
        }
    }
}

// Content of About
@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun AboutContent(activity: ComponentActivity){
    Column() {
        TopAppBar(
            colors = TopAppBarDefaults.centerAlignedTopAppBarColors(MaterialTheme.colorScheme.primaryContainer),
            title = {
                Text(text = "About",
                    style = MaterialTheme.typography.headlineSmall,
                    color = MaterialTheme.colorScheme.onPrimaryContainer
                )},
            navigationIcon = {
                IconButton(onClick = { activity.finish() }) {
                    Icon(
                        imageVector = Icons.Filled.ArrowBack,
                        contentDescription = null,
                        modifier = Modifier.size(28.dp),
                        tint = MaterialTheme.colorScheme.onPrimaryContainer
                    )
                }
            },
            modifier = Modifier.fillMaxWidth()
        )
        Column(
            modifier = Modifier
                .verticalScroll(rememberScrollState())
                .fillMaxWidth())
        {
            AboutTextElement("This Product is published under the\nGNU General Public License\nVersion 3, 29 June 2007", 16.dp)
            AboutTextElement("Developed by:\n- Paul Posch\n- Matthias Meyer\n- Jakub Szarko\n- Emilian Bührer", 32.dp)
            AboutTextElement("Fun Facts:\nThis app consists of 2.873 lines of code\nThe repository is 413KB big\nThe development took about 3 month", 64.dp)  //TODO: Update before launch
        }
    }
}

@Composable
fun AboutTextElement(text: String, space: Dp){
    Spacer(modifier = Modifier.height(space))
    Text(text = text,
        style = MaterialTheme.typography.bodySmall,
        color = MaterialTheme.colorScheme.onBackground,
        modifier = Modifier.padding(start = 16.dp, end = 16.dp))
}