amethyst/app/src/main/java/com/vitorpamplona/amethyst/ui/actions/UploadFromGallery.kt

package com.vitorpamplona.amethyst.ui.navigation

import android.net.Uri
import androidx.activity.compose.rememberLauncherForActivityResult
import androidx.activity.result.contract.ActivityResultContracts
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.padding
import androidx.compose.material.Button
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.SideEffect
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
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import com.google.accompanist.permissions.ExperimentalPermissionsApi
import com.google.accompanist.permissions.isGranted
import com.google.accompanist.permissions.rememberPermissionState
import com.google.accompanist.permissions.shouldShowRationale

@OptIn(ExperimentalPermissionsApi::class)
@Composable
fun UploadFromGallery(onImageChosen: (Uri) -> Unit) {
    val cameraPermissionState = rememberPermissionState(
        android.Manifest.permission.READ_MEDIA_IMAGES
    )

    if (cameraPermissionState.status.isGranted) {
        var showGallerySelect by remember { mutableStateOf(false) }
        if (showGallerySelect) {
            GallerySelect(
                onImageUri = { uri ->
                    showGallerySelect = false
                    if (uri != null)
                        onImageChosen(uri)
                }
            )
        } else {
            Box() {
                Button(
                    modifier = Modifier
                        .align(Alignment.TopCenter)
                        .padding(4.dp),
                    onClick = {
                        showGallerySelect = true
                    }
                ) {
                    Text("Add Image from Gallery")
                }
            }
        }
    } else {
        Column {
            Button(onClick = { cameraPermissionState.launchPermissionRequest() }) {
                Text("Add Image from Gallery")
            }
        }
    }
}


@Composable
fun GallerySelect(
    onImageUri: (Uri?) -> Unit = { }
) {
    val launcher = rememberLauncherForActivityResult(
        contract = ActivityResultContracts.GetContent(),
        onResult = { uri: Uri? ->
            onImageUri(uri)
        }
    )

    @Composable
    fun LaunchGallery() {
        SideEffect {
            launcher.launch("image/*")
        }
    }

    LaunchGallery()
}