package eu.kanade.tachiyomi

import android.annotation.SuppressLint
import android.app.ActivityManager
import android.app.Application
import android.app.PendingIntent
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.os.Build
import android.os.Looper
import android.webkit.WebView
import androidx.appcompat.app.AppCompatDelegate
import androidx.core.app.NotificationManagerCompat
import androidx.core.content.getSystemService
import androidx.lifecycle.DefaultLifecycleObserver
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.ProcessLifecycleOwner
import androidx.lifecycle.lifecycleScope
import coil.ImageLoader
import coil.ImageLoaderFactory
import coil.decode.GifDecoder
import coil.decode.ImageDecoderDecoder
import coil.disk.DiskCache
import coil.util.DebugLogger
import eu.kanade.tachiyomi.data.coil.MangaCoverFetcher
import eu.kanade.tachiyomi.data.coil.MangaCoverKeyer
import eu.kanade.tachiyomi.data.coil.TachiyomiImageDecoder
import eu.kanade.tachiyomi.data.notification.Notifications
import eu.kanade.tachiyomi.data.preference.PreferenceValues
import eu.kanade.tachiyomi.data.preference.PreferencesHelper
import eu.kanade.tachiyomi.network.NetworkHelper
import eu.kanade.tachiyomi.ui.base.delegate.SecureActivityDelegate
import eu.kanade.tachiyomi.util.preference.asImmediateFlow
import eu.kanade.tachiyomi.util.system.AuthenticatorUtil
import eu.kanade.tachiyomi.util.system.WebViewUtil
import eu.kanade.tachiyomi.util.system.animatorDurationScale
import eu.kanade.tachiyomi.util.system.logcat
import eu.kanade.tachiyomi.util.system.notification
import kotlinx.coroutines.flow.launchIn
import kotlinx.coroutines.flow.onEach
import logcat.AndroidLogcatLogger
import logcat.LogPriority
import logcat.LogcatLogger
import org.acra.config.httpSender
import org.acra.ktx.initAcra
import org.acra.sender.HttpSender
import org.conscrypt.Conscrypt
import uy.kohesive.injekt.Injekt
import uy.kohesive.injekt.api.get
import uy.kohesive.injekt.injectLazy
import java.security.Security

open class App : Application(), DefaultLifecycleObserver, ImageLoaderFactory {

    private val preferences: PreferencesHelper by injectLazy()

    private val disableIncognitoReceiver = DisableIncognitoReceiver()

    @SuppressLint("LaunchActivityFromNotification")
    override fun onCreate() {
        super<Application>.onCreate()

        // TLS 1.3 support for Android < 10
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
            Security.insertProviderAt(Conscrypt.newProvider(), 1)
        }

        // Avoid potential crashes
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            val process = getProcessName()
            if (packageName != process) WebView.setDataDirectorySuffix(process)
        }

        Injekt.importModule(AppModule(this))

        setupAcra()
        setupNotificationChannels()

        ProcessLifecycleOwner.get().lifecycle.addObserver(this)

        // Show notification to disable Incognito Mode when it's enabled
        preferences.incognitoMode().asFlow()
            .onEach { enabled ->
                val notificationManager = NotificationManagerCompat.from(this)
                if (enabled) {
                    disableIncognitoReceiver.register()
                    val notification = notification(Notifications.CHANNEL_INCOGNITO_MODE) {
                        setContentTitle(getString(R.string.pref_incognito_mode))
                        setContentText(getString(R.string.notification_incognito_text))
                        setSmallIcon(R.drawable.ic_glasses_24dp)
                        setOngoing(true)

                        val pendingIntent = PendingIntent.getBroadcast(
                            this@App,
                            0,
                            Intent(ACTION_DISABLE_INCOGNITO_MODE),
                            PendingIntent.FLAG_ONE_SHOT,
                        )
                        setContentIntent(pendingIntent)
                    }
                    notificationManager.notify(Notifications.ID_INCOGNITO_MODE, notification)
                } else {
                    disableIncognitoReceiver.unregister()
                    notificationManager.cancel(Notifications.ID_INCOGNITO_MODE)
                }
            }
            .launchIn(ProcessLifecycleOwner.get().lifecycleScope)

        preferences.themeMode()
            .asImmediateFlow {
                AppCompatDelegate.setDefaultNightMode(
                    when (it) {
                        PreferenceValues.ThemeMode.light -> AppCompatDelegate.MODE_NIGHT_NO
                        PreferenceValues.ThemeMode.dark -> AppCompatDelegate.MODE_NIGHT_YES
                        PreferenceValues.ThemeMode.system -> AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
                    },
                )
            }.launchIn(ProcessLifecycleOwner.get().lifecycleScope)

        if (!LogcatLogger.isInstalled && preferences.verboseLogging()) {
            LogcatLogger.install(AndroidLogcatLogger(LogPriority.VERBOSE))
        }
    }

    override fun newImageLoader(): ImageLoader {
        return ImageLoader.Builder(this).apply {
            val callFactoryInit = { Injekt.get<NetworkHelper>().client }
            val diskCacheInit = { CoilDiskCache.get(this@App) }
            components {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
                    add(ImageDecoderDecoder.Factory())
                } else {
                    add(GifDecoder.Factory())
                }
                add(TachiyomiImageDecoder.Factory())
                add(MangaCoverFetcher.Factory(lazy(callFactoryInit), lazy(diskCacheInit)))
                add(MangaCoverKeyer())
            }
            callFactory(callFactoryInit)
            diskCache(diskCacheInit)
            crossfade((300 * this@App.animatorDurationScale).toInt())
            allowRgb565(getSystemService<ActivityManager>()!!.isLowRamDevice)
            if (preferences.verboseLogging()) logger(DebugLogger())
        }.build()
    }

    override fun onStop(owner: LifecycleOwner) {
        if (!AuthenticatorUtil.isAuthenticating && preferences.lockAppAfter().get() >= 0) {
            SecureActivityDelegate.locked = true
        }
    }

    override fun getPackageName(): String {
        // This causes freezes in Android 6/7 for some reason
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            try {
                // Override the value passed as X-Requested-With in WebView requests
                val stackTrace = Looper.getMainLooper().thread.stackTrace
                val chromiumElement = stackTrace.find {
                    it.className.equals("org.chromium.base.BuildInfo",
                        ignoreCase = true)
                }
                if (chromiumElement?.methodName.equals("getAll", ignoreCase = true)) {
                    return WebViewUtil.SPOOF_PACKAGE_NAME
                }
            } catch (e: Exception) {
            }
        }
        return super.getPackageName()
    }

    protected open fun setupAcra() {
        if (BuildConfig.FLAVOR != "dev") {
            initAcra {
                buildConfigClass = BuildConfig::class.java
                excludeMatchingSharedPreferencesKeys = listOf(".*username.*", ".*password.*", ".*token.*")

                httpSender {
                    uri = BuildConfig.ACRA_URI
                    httpMethod = HttpSender.Method.PUT
                }
            }
        }
    }

    protected open fun setupNotificationChannels() {
        try {
            Notifications.createChannels(this)
        } catch (e: Exception) {
            logcat(LogPriority.ERROR, e) { "Failed to modify notification channels" }
        }
    }

    private inner class DisableIncognitoReceiver : BroadcastReceiver() {
        private var registered = false

        override fun onReceive(context: Context, intent: Intent) {
            preferences.incognitoMode().set(false)
        }

        fun register() {
            if (!registered) {
                registerReceiver(this, IntentFilter(ACTION_DISABLE_INCOGNITO_MODE))
                registered = true
            }
        }

        fun unregister() {
            if (registered) {
                unregisterReceiver(this)
                registered = false
            }
        }
    }
}

private const val ACTION_DISABLE_INCOGNITO_MODE = "tachi.action.DISABLE_INCOGNITO_MODE"

/**
 * Direct copy of Coil's internal SingletonDiskCache so that [MangaCoverFetcher] can access it.
 */
internal object CoilDiskCache {

    private const val FOLDER_NAME = "image_cache"
    private var instance: DiskCache? = null

    @Synchronized
    fun get(context: Context): DiskCache {
        return instance ?: run {
            val safeCacheDir = context.cacheDir.apply { mkdirs() }
            // Create the singleton disk cache instance.
            DiskCache.Builder()
                .directory(safeCacheDir.resolve(FOLDER_NAME))
                .build()
                .also { instance = it }
        }
    }
}