space-android/app/src/main/java/com/nextcloud/ui/composeActivity/ComposeActivity.kt

/*
 * Nextcloud Android client application
 *
 * @author Alper Ozturk
 * Copyright (C) 2024 Alper Ozturk
 * Copyright (C) 2024 Nextcloud GmbH
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

package com.nextcloud.ui.composeActivity

import android.content.Context
import android.os.Bundle
import android.view.MenuItem
import androidx.compose.material3.ColorScheme
import androidx.compose.material3.MaterialTheme
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 com.nextcloud.client.assistant.AssistantScreen
import com.nextcloud.client.assistant.AssistantViewModel
import com.nextcloud.common.NextcloudClient
import com.nextcloud.common.User
import com.nextcloud.utils.extensions.getSerializableArgument
import com.nextcloud.utils.extensions.toColorScheme
import com.owncloud.android.R
import com.owncloud.android.databinding.ActivityComposeBinding
import com.owncloud.android.lib.common.OwnCloudClientFactory
import com.owncloud.android.lib.common.accounts.AccountUtils
import com.owncloud.android.lib.common.utils.Log_OC
import com.owncloud.android.ui.activity.DrawerActivity
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.withContext

class ComposeActivity : DrawerActivity() {

    lateinit var binding: ActivityComposeBinding

    companion object {
        const val destinationKey = "destinationKey"
        const val titleKey = "titleKey"
        const val menuItemKey = "menuItemKey"

        lateinit var schemeFlow: MutableStateFlow<ColorScheme>
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityComposeBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val destination = intent.getSerializableArgument(destinationKey, ComposeDestination::class.java)
        val titleId = intent.getIntExtra(titleKey, R.string.empty)
        val menuItemId = intent.getIntExtra(menuItemKey, R.id.nav_assistant)

        setupToolbar()
        updateActionBarTitleAndHomeButtonByString(getString(titleId))

        setupDrawer(menuItemId)

        val colorScheme = viewThemeUtils.material.getScheme(this).toColorScheme()
        schemeFlow = MutableStateFlow(colorScheme)

        binding.composeView.setContent {
            MaterialTheme(
                colorScheme = colorScheme,
                content = {
                    Content(destination, storageManager.user, this)
                }
            )
        }
    }

    override fun onResume() {
        super.onResume()
        setDrawerMenuItemChecked(R.id.nav_assistant)
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        return when (item.itemId) {
            android.R.id.home -> {
                if (isDrawerOpen) closeDrawer() else openDrawer()
                true
            }
            else -> super.onOptionsItemSelected(item)
        }
    }

    @Composable
    private fun Content(destination: ComposeDestination?, user: User, context: Context) {
        var nextcloudClient by remember { mutableStateOf<NextcloudClient?>(null) }

        LaunchedEffect(Unit) {
            nextcloudClient = getNextcloudClient(user, context)
        }

        if (destination == ComposeDestination.AssistantScreen) {
            nextcloudClient?.let {
                AssistantScreen(
                    viewModel = AssistantViewModel(
                        client = it
                    )
                )
            }
        }
    }

    private suspend fun getNextcloudClient(user: User, context: Context): NextcloudClient? {
        return withContext(Dispatchers.IO) {
            try {
                OwnCloudClientFactory.createNextcloudClient(user, context)
            } catch (e: AccountUtils.AccountNotFoundException) {
                Log_OC.e(this, "Error caught at init of AssistantRepository", e)
                null
            }
        }
    }
}