package be.mygod.vpnhotspot

import android.annotation.SuppressLint
import android.app.Application
import android.content.ActivityNotFoundException
import android.content.ClipboardManager
import android.content.Context
import android.content.Intent
import android.content.res.Configuration
import android.location.LocationManager
import android.os.Build
import android.provider.Settings
import android.util.Log
import android.widget.Toast
import androidx.annotation.Size
import androidx.browser.customtabs.CustomTabColorSchemeParams
import androidx.browser.customtabs.CustomTabsIntent
import androidx.core.content.getSystemService
import androidx.preference.PreferenceManager
import be.mygod.librootkotlinx.NoShellException
import be.mygod.vpnhotspot.net.DhcpWorkaround
import be.mygod.vpnhotspot.room.AppDatabase
import be.mygod.vpnhotspot.root.RootManager
import be.mygod.vpnhotspot.util.DeviceStorageApp
import be.mygod.vpnhotspot.util.Services
import be.mygod.vpnhotspot.widget.SmartSnackbar
import com.google.firebase.analytics.ktx.ParametersBuilder
import com.google.firebase.analytics.ktx.analytics
import com.google.firebase.crashlytics.FirebaseCrashlytics
import com.google.firebase.ktx.Firebase
import com.google.firebase.ktx.initialize
import kotlinx.coroutines.DEBUG_PROPERTY_NAME
import kotlinx.coroutines.DEBUG_PROPERTY_VALUE_ON
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
import timber.log.Timber
import java.util.*

class App : Application() {
    companion object {
        @SuppressLint("StaticFieldLeak")
        lateinit var app: App
    }

    @SuppressLint("RestrictedApi")
    override fun onCreate() {
        super.onCreate()
        app = this
        deviceStorage = DeviceStorageApp(this)
        // alternative to PreferenceManager.getDefaultSharedPreferencesName(this)
        deviceStorage.moveSharedPreferencesFrom(this, PreferenceManager(this).sharedPreferencesName)
        deviceStorage.moveDatabaseFrom(this, AppDatabase.DB_NAME)
        BootReceiver.migrateIfNecessary()
        Services.init { this }

        // overhead of debug mode is minimal: https://github.com/Kotlin/kotlinx.coroutines/blob/f528898/docs/debugging.md#debug-mode
        System.setProperty(DEBUG_PROPERTY_NAME, DEBUG_PROPERTY_VALUE_ON)
        Firebase.initialize(deviceStorage)
        when (val codename = Build.VERSION.CODENAME) {
            "REL" -> { }
            else -> FirebaseCrashlytics.getInstance().apply {
                setCustomKey("codename", codename)
                setCustomKey("preview_sdk", Build.VERSION.PREVIEW_SDK_INT)
            }
        }
        Timber.plant(object : Timber.DebugTree() {
            @SuppressLint("LogNotTimber")
            override fun log(priority: Int, tag: String?, message: String, t: Throwable?) {
                if (t == null) {
                    if (priority != Log.DEBUG || BuildConfig.DEBUG) Log.println(priority, tag, message)
                    FirebaseCrashlytics.getInstance().log("${"XXVDIWEF".getOrElse(priority) { 'X' }}/$tag: $message")
                } else {
                    if (priority >= Log.WARN || priority == Log.DEBUG) {
                        Log.println(priority, tag, message)
                        Log.w(tag, message, t)
                    }
                    if (priority >= Log.INFO && t !is NoShellException) {
                        FirebaseCrashlytics.getInstance().recordException(t)
                    }
                }
            }
        })
        ServiceNotification.updateNotificationChannels()
        if (DhcpWorkaround.shouldEnable) DhcpWorkaround.enable(true)
    }

    override fun onConfigurationChanged(newConfig: Configuration) {
        super.onConfigurationChanged(newConfig)
        ServiceNotification.updateNotificationChannels()
    }

    override fun onTrimMemory(level: Int) {
        super.onTrimMemory(level)
        if (level == TRIM_MEMORY_RUNNING_CRITICAL || level >= TRIM_MEMORY_BACKGROUND) GlobalScope.launch {
            RootManager.closeExisting()
        }
    }

    /**
     * This method is used to log "expected" and well-handled errors, i.e. we care less about logs, etc.
     * logException is inappropriate sometimes because it flushes all logs that could be used to investigate other bugs.
     */
    fun logEvent(@Size(min = 1L, max = 40L) event: String, block: ParametersBuilder.() -> Unit = { }) {
        val builder = ParametersBuilder()
        builder.block()
        Timber.i(if (builder.bundle.isEmpty) event else "$event, extras: ${builder.bundle}")
        Firebase.analytics.logEvent(event, builder.bundle)
    }

    /**
     * LOH also requires location to be turned on. So does p2p for some reason. Source:
     * https://android.googlesource.com/platform/frameworks/opt/net/wifi/+/53e0284/service/java/com/android/server/wifi/WifiServiceImpl.java#1204
     * https://android.googlesource.com/platform/frameworks/opt/net/wifi/+/53e0284/service/java/com/android/server/wifi/WifiSettingsStore.java#228
     */
    inline fun <reified T> startServiceWithLocation(context: Context) {
        if (Build.VERSION.SDK_INT < 33 && location?.isLocationEnabled != true) try {
            context.startActivity(Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS))
            Toast.makeText(context, R.string.tethering_location_off, Toast.LENGTH_LONG).show()
        } catch (e: ActivityNotFoundException) {
            app.logEvent("location_settings") { param("message", e.toString()) }
            SmartSnackbar.make(R.string.tethering_location_off).show()
        } else context.startForegroundService(Intent(context, T::class.java))
    }

    lateinit var deviceStorage: Application
    val english by lazy {
        createConfigurationContext(Configuration(resources.configuration).apply {
            setLocale(Locale.ENGLISH)
        })
    }
    val pref by lazy { PreferenceManager.getDefaultSharedPreferences(deviceStorage) }
    val clipboard by lazy { getSystemService<ClipboardManager>()!! }
    val location by lazy { getSystemService<LocationManager>() }

    val hasTouch by lazy { packageManager.hasSystemFeature("android.hardware.faketouch") }
    val customTabsIntent by lazy {
        CustomTabsIntent.Builder().apply {
            setColorScheme(CustomTabsIntent.COLOR_SCHEME_SYSTEM)
            setColorSchemeParams(CustomTabsIntent.COLOR_SCHEME_LIGHT, CustomTabColorSchemeParams.Builder().apply {
                setToolbarColor(resources.getColor(R.color.light_colorPrimary, theme))
            }.build())
            setColorSchemeParams(CustomTabsIntent.COLOR_SCHEME_DARK, CustomTabColorSchemeParams.Builder().apply {
                setToolbarColor(resources.getColor(R.color.dark_colorPrimary, theme))
            }.build())
        }.build()
    }
}