package app.myzel394.alibi.ui.components.WelcomeScreen.pages

import android.Manifest
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
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.layout.width
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.verticalScroll
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.automirrored.filled.InsertDriveFile
import androidx.compose.material.icons.filled.ChevronLeft
import androidx.compose.material.icons.filled.ChevronRight
import androidx.compose.material.icons.filled.Folder
import androidx.compose.material3.AlertDialog
import androidx.compose.material3.Button
import androidx.compose.material3.ButtonDefaults
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
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.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import app.myzel394.alibi.R
import app.myzel394.alibi.db.AppSettings
import app.myzel394.alibi.helpers.BatchesFolder
import app.myzel394.alibi.helpers.VideoBatchesFolder
import app.myzel394.alibi.ui.BIG_PRIMARY_BUTTON_SIZE
import app.myzel394.alibi.ui.RECORDER_MEDIA_SELECTED_VALUE
import app.myzel394.alibi.ui.SUPPORTS_SCOPED_STORAGE
import app.myzel394.alibi.ui.components.WelcomeScreen.atoms.SaveFolderSelection
import app.myzel394.alibi.ui.components.atoms.PermissionRequester
import app.myzel394.alibi.ui.utils.rememberFolderSelectorDialog

@Composable
fun SaveFolderPage(
    onBack: () -> Unit,
    onContinue: (saveFolder: String?) -> Unit,
    appSettings: AppSettings,
) {
    var saveFolder by rememberSaveable { mutableStateOf<String?>(null) }

    val context = LocalContext.current

    val isLowOnStorage: Boolean = remember(appSettings.maxDuration) {
        val availableBytes = VideoBatchesFolder.viaInternalFolder(context).getAvailableBytes()

        if (availableBytes == null) {
            return@remember false
        }

        val bytesPerMinute = BatchesFolder.requiredBytesForOneMinuteOfRecording(appSettings)
        val requiredBytes = appSettings.maxDuration / 1000 / 60 * bytesPerMinute

        // Allow for a 10% margin of error
        availableBytes < requiredBytes
    }

    LaunchedEffect(isLowOnStorage, appSettings.maxDuration) {
        if (isLowOnStorage) {
            if (saveFolder == null) {
                saveFolder = RECORDER_MEDIA_SELECTED_VALUE
            }
        } else {
            saveFolder = null
        }
    }

    Column(
        modifier = Modifier
            .fillMaxSize()
            .verticalScroll(rememberScrollState()),
        verticalArrangement = Arrangement.SpaceBetween,
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        Spacer(modifier = Modifier.height(40.dp))
        Column(
            modifier = Modifier
                .padding(horizontal = 32.dp),
            verticalArrangement = Arrangement.Center,
            horizontalAlignment = Alignment.CenterHorizontally,
        ) {
            Icon(
                Icons.AutoMirrored.Filled.InsertDriveFile,
                contentDescription = null,
                tint = MaterialTheme.colorScheme.tertiary,
                modifier = Modifier.size(128.dp),
            )
            Spacer(modifier = Modifier.height(32.dp))
            Text(
                stringResource(R.string.ui_welcome_saveFolder_title),
                style = MaterialTheme.typography.titleLarge,
            )
            Spacer(modifier = Modifier.height(16.dp))
            Text(
                stringResource(R.string.ui_welcome_saveFolder_message),
                fontStyle = MaterialTheme.typography.bodySmall.fontStyle,
                fontSize = MaterialTheme.typography.bodySmall.fontSize,
                color = MaterialTheme.typography.bodySmall.color,
            )
        }
        Spacer(modifier = Modifier.height(40.dp))
        Box(
            modifier = Modifier
                .widthIn(max = 400.dp)
                .padding(horizontal = 16.dp)
        ) {
            SaveFolderSelection(
                saveFolder = saveFolder,
                isLowOnStorage = isLowOnStorage,
                onSaveFolderChange = { saveFolder = it },
            )
        }
        Spacer(modifier = Modifier.height(40.dp))
        Row(
            verticalAlignment = Alignment.CenterVertically,
            modifier = Modifier
                .fillMaxWidth()
                .padding(16.dp),
            horizontalArrangement = Arrangement.spacedBy(16.dp),
        ) {
            IconButton(
                onClick = onBack,
                modifier = Modifier
                    .size(BIG_PRIMARY_BUTTON_SIZE),
            ) {
                Icon(
                    Icons.Default.ChevronLeft,
                    contentDescription = null,
                )
            }
            PermissionRequester(
                permission = Manifest.permission.WRITE_EXTERNAL_STORAGE,
                icon = Icons.AutoMirrored.Filled.InsertDriveFile,
                onPermissionAvailable = { onContinue(saveFolder) },
            ) { requestWritePermission ->
                val selectFolder = rememberFolderSelectorDialog { folder ->
                    if (folder == null) {
                        return@rememberFolderSelectorDialog
                    }

                    onContinue(saveFolder)
                }
                var showCustomFolderHint by rememberSaveable { mutableStateOf(false) }

                if (showCustomFolderHint) {
                    _CustomFolderDialog(
                        onAbort = { showCustomFolderHint = false },
                        onOk = {
                            showCustomFolderHint = false
                            selectFolder()
                        },
                    )
                }

                Button(
                    onClick = {
                        when (saveFolder) {
                            null -> onContinue(saveFolder)
                            RECORDER_MEDIA_SELECTED_VALUE -> {
                                if (SUPPORTS_SCOPED_STORAGE) {
                                    onContinue(saveFolder)
                                } else {
                                    requestWritePermission()
                                }
                            }

                            else -> {
                                showCustomFolderHint = true
                            }
                        }
                    },
                    enabled = if (saveFolder == null) !isLowOnStorage else true,
                    modifier = Modifier
                        .fillMaxWidth()
                        .height(BIG_PRIMARY_BUTTON_SIZE),
                    contentPadding = ButtonDefaults.ButtonWithIconContentPadding,
                ) {
                    Icon(
                        Icons.Default.ChevronRight,
                        contentDescription = null,
                        modifier = Modifier.size(ButtonDefaults.IconSize)
                    )
                    Spacer(modifier = Modifier.width(ButtonDefaults.IconSpacing))
                    Text(stringResource(R.string.continue_label))
                }
            }
        }
    }
}

@Composable
fun _CustomFolderDialog(
    onAbort: () -> Unit,
    onOk: () -> Unit,
) {
    AlertDialog(
        onDismissRequest = onAbort,
        icon = {
            Icon(
                Icons.Default.Folder,
                contentDescription = null,
            )
        },
        title = {
            Text(stringResource(R.string.ui_welcome_saveFolder_customFolder_title))
        },
        text = {
            Text(stringResource(R.string.ui_welcome_saveFolder_customFolder_message))
        },
        dismissButton = {
            TextButton(
                onClick = onAbort,
                contentPadding = ButtonDefaults.TextButtonContentPadding,
                colors = ButtonDefaults.textButtonColors(),
            ) {
                Text(stringResource(R.string.dialog_close_cancel_label))
            }
        },
        confirmButton = {
            Button(
                onClick = onOk,
            ) {
                Text(stringResource(R.string.dialog_close_neutral_label))
            }
        }
    )

}