package com.schoolapp.cleverclass

import android.graphics.BitmapFactory
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.Image
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.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.graphics.asImageBitmap
import androidx.compose.ui.unit.dp
import com.schoolapp.cleverclass.ui.theme.CleverClassTheme
import kotlinx.coroutines.DelicateCoroutinesApi
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
import java.io.File

class DSBActivity : ComponentActivity() {
    @OptIn(DelicateCoroutinesApi::class)
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        GlobalScope.launch(Dispatchers.IO) {
            downloadDSB(this@DSBActivity)
        }

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

// Content of DSBmobile
@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun DSBContent(activity: ComponentActivity){
    Column {
        TopAppBar(
            colors = TopAppBarDefaults.centerAlignedTopAppBarColors(MaterialTheme.colorScheme.primaryContainer),
            title = {
                Text(text = "DSBmobile",
                    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())) {
            val mainFolder = File(activity.filesDir, "dataDSB")

            mainFolder.listFiles()?.forEach { folder ->
                DayPrefab(folder = folder)
                Spacer(modifier = Modifier.height(48.dp))
            }
        }
    }
}

@Composable
fun DayPrefab(folder: File){
    val imageFiles = folder.listFiles { file -> file.extension == "jpg" }?.toList()

    Column {
        imageFiles?.forEach {
            val imageBitmap = BitmapFactory.decodeFile(it.absolutePath)

            Image(bitmap = imageBitmap.asImageBitmap(), contentDescription = null)
            Spacer(modifier = Modifier.height(8.dp))
        }
    }
}