photog/android/app/src/main/java/ws/inflo/photogallery/MainActivity.kt

package ws.inflo.photogallery

import android.Manifest
import android.content.Intent
import android.content.pm.PackageManager
import android.net.Uri
import android.os.Build
import android.os.Bundle
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.activity.compose.rememberLauncherForActivityResult
import androidx.activity.compose.setContent
import androidx.activity.result.PickVisualMediaRequest
import androidx.activity.result.contract.ActivityResultContracts
import androidx.activity.viewModels
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.setValue
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.core.content.ContextCompat
import androidx.core.net.toUri
import ws.inflo.photogallery.ui.PhotoGalleryTheme
import ws.inflo.photogallery.ui.PostScreen
import ws.inflo.photogallery.ui.SettingsScreen
import ws.inflo.photogallery.ui.UploadViewModel

class MainActivity : ComponentActivity() {

    private val viewModel: UploadViewModel by viewModels()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        consumeShareIntent(intent)

        setContent {
            PhotoGalleryTheme {
                // Land on settings until there is somewhere to post to.
                var showSettings by rememberSaveable { mutableStateOf(!viewModel.isConfigured) }

                val picker = rememberLauncherForActivityResult(
                    ActivityResultContracts.PickVisualMedia(),
                ) { uri -> uri?.let(viewModel::selectImage) }

                val notificationPermission = rememberLauncherForActivityResult(
                    ActivityResultContracts.RequestPermission(),
                ) { /* Upload works either way; this only affects the progress notification. */ }

                LaunchedEffect(Unit) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU &&
                        ContextCompat.checkSelfPermission(
                            this@MainActivity,
                            Manifest.permission.POST_NOTIFICATIONS,
                        ) != PackageManager.PERMISSION_GRANTED
                    ) {
                        notificationPermission.launch(Manifest.permission.POST_NOTIFICATIONS)
                    }
                }

                if (showSettings) {
                    SettingsScreen(
                        state = viewModel.config,
                        onBaseUrlChange = viewModel::setBaseUrl,
                        onUsernameChange = viewModel::setUsername,
                        onPasswordChange = viewModel::setPassword,
                        onSave = viewModel::saveAndTest,
                        onBack = if (viewModel.isConfigured) {
                            { showSettings = false }
                        } else {
                            null
                        },
                    )
                } else {
                    PostScreen(
                        state = viewModel.post,
                        onPickImage = {
                            picker.launch(
                                PickVisualMediaRequest(
                                    ActivityResultContracts.PickVisualMedia.ImageOnly,
                                ),
                            )
                        },
                        onCaptionChange = viewModel::setCaption,
                        onDateChange = viewModel::setDate,
                        onSubmit = viewModel::submit,
                        onReset = viewModel::clear,
                        onOpenSettings = { showSettings = true },
                        onOpenUrl = ::openUrl,
                    )
                }
            }
        }
    }

    override fun onNewIntent(intent: Intent) {
        super.onNewIntent(intent)
        setIntent(intent)
        consumeShareIntent(intent)
    }

    /** Picks up a photo handed over by the share sheet. */
    private fun consumeShareIntent(intent: Intent?) {
        if (intent?.action != Intent.ACTION_SEND) return
        val uri: Uri? = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
            intent.getParcelableExtra(Intent.EXTRA_STREAM, Uri::class.java)
        } else {
            @Suppress("DEPRECATION")
            intent.getParcelableExtra(Intent.EXTRA_STREAM)
        }
        uri?.let(viewModel::selectImage)
    }

    private fun openUrl(url: String) {
        if (url.isBlank()) return
        try {
            startActivity(Intent(Intent.ACTION_VIEW, url.toUri()))
        } catch (_: Exception) {
            Toast.makeText(this, "No browser to open $url", Toast.LENGTH_SHORT).show()
        }
    }
}