package com.geeksville.mesh

// import kotlinx.android.synthetic.main.tabs.*
import android.Manifest
import android.bluetooth.BluetoothAdapter
import android.bluetooth.BluetoothManager
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.content.pm.PackageManager
import android.net.Uri
import android.os.Build
import android.os.Bundle
import android.view.*
import android.widget.FrameLayout
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.Composable
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import androidx.fragment.app.Fragment
import androidx.ui.core.setContent
import androidx.viewpager2.adapter.FragmentStateAdapter
import androidx.viewpager2.widget.ViewPager2
import com.geeksville.android.GeeksvilleApplication
import com.geeksville.android.Logging
import com.geeksville.android.ServiceClient
import com.geeksville.mesh.model.MessagesState
import com.geeksville.mesh.model.NodeDB
import com.geeksville.mesh.model.TextMessage
import com.geeksville.mesh.model.UIState
import com.geeksville.mesh.service.*
import com.geeksville.mesh.ui.*
import com.geeksville.util.Exceptions
import com.geeksville.util.exceptionReporter
import com.google.android.gms.auth.api.signin.GoogleSignIn
import com.google.android.gms.auth.api.signin.GoogleSignInAccount
import com.google.android.gms.tasks.Task
import com.google.android.material.tabs.TabLayout
import com.google.android.material.tabs.TabLayoutMediator
import java.nio.charset.Charset

/*
UI design

material setup instructions: https://material.io/develop/android/docs/getting-started/
dark theme (or use system eventually) https://material.io/develop/android/theming/dark/

NavDrawer is a standard draw which can be dragged in from the left or the menu icon inside the app
title.

Fragments:

SettingsFragment shows "Settings"
  username
  shortname
  bluetooth pairing list
  (eventually misc device settings that are not channel related)

Channel fragment "Channel"
  qr code, copy link button
  ch number
  misc other settings
  (eventually a way of choosing between past channels)

ChatFragment "Messages"
  a text box to enter new texts
  a scrolling list of rows.  each row is a text and a sender info layout

NodeListFragment "Users"
  a node info row for every node

ViewModels:

  BTScanModel starts/stops bt scan and provides list of devices (manages entire scan lifecycle)

  MeshModel contains: (manages entire service relationship)
  current received texts
  current radio macaddr
  current node infos (updated dynamically)

eventually use bottom navigation bar to switch between, Members, Chat, Channel, Settings. https://material.io/develop/android/components/bottom-navigation-view/
  use numbers of # chat messages and # of members in the badges.

(per this recommendation to not use top tabs: https://ux.stackexchange.com/questions/102439/android-ux-when-to-use-bottom-navigation-and-when-to-use-tabs )


eventually:
  make a custom theme: https://github.com/material-components/material-components-android/tree/master/material-theme-builder
*/

val utf8 = Charset.forName("UTF-8")

fun androidx.fragment.app.Fragment.setComposable(
    id: Int,
    content: @Composable() () -> Unit
): View? =
    context?.let {
        FrameLayout(it).apply {
            this.id =
                id // Compose requires a unique ID for the containing view to make savedInstanceState work

            layoutParams = ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
            )
            setContent(content)
        }
    }

/**
 * A fragment that represents a current 'screen' in our app.
 *
 * Useful for tracking analytics
 */
open class ScreenFragment(private val screenName: String) : Fragment() {
    override fun onResume() {
        super.onResume()
        GeeksvilleApplication.analytics.sendScreenView(screenName)
    }

    override fun onPause() {
        GeeksvilleApplication.analytics.endScreenView()
        super.onPause()
    }
}

class ComposeFragment(screenName: String, id: Int, private val content: @Composable() () -> Unit) :
    ScreenFragment(screenName),
    Logging {
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? =
        setComposable(id, content)
}


class MainActivity : AppCompatActivity(), Logging,
    ActivityCompat.OnRequestPermissionsResultCallback {

    companion object {
        const val REQUEST_ENABLE_BT = 10
        const val DID_REQUEST_PERM = 11
        const val RC_SIGN_IN = 12 // google signin completed
    }


    private val bluetoothAdapter: BluetoothAdapter? by lazy(LazyThreadSafetyMode.NONE) {
        val bluetoothManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
        bluetoothManager.adapter
    }

    /*
            <!--             Screen.messages -> MessagesContent()
            Screen.settings -> SettingsContent()
            Screen.users -> UsersContent()
            Screen.channel -> ChannelContent(UIState.getChannel())
            Screen.map -> MapContent() -->

        /--
        <com.google.android.material.tabs.TabItem
            android:icon="@drawable/ic_twotone_message_24"
            android:text="Messages"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content" />

        <com.google.android.material.tabs.TabItem
            android:icon="@drawable/ic_twotone_settings_applications_24"
            android:text="Settings"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content" />  -->
 */
    data class TabInfo(val text: String, val icon: Int, val content: Fragment)

    // private val tabIndexes = generateSequence(0) { it + 1 } FIXME, instead do withIndex or zip? to get the ids below, also stop duplicating strings
    private val tabInfos = arrayOf(
        TabInfo(
            "Messages",
            R.drawable.ic_twotone_message_24,
            ComposeFragment("Messages", 1) { MessagesContent() }),
        TabInfo(
            "Settings",
            R.drawable.ic_twotone_settings_applications_24,
            ComposeFragment("Settings", 2) { SettingsContent() }),
        TabInfo(
            "Users",
            R.drawable.ic_twotone_people_24,
            ComposeFragment("Users", 3) { UsersContent() }),
        TabInfo(
            "Channel",
            R.drawable.ic_twotone_contactless_24,
            ComposeFragment("Channel", 4) { ChannelContent(UIState.getChannel()) }),
        TabInfo(
            "Map",
            R.drawable.ic_twotone_map_24,
            ComposeFragment("Map", 5) { MapContent() })
    )

    private
    val tabsAdapter = object : FragmentStateAdapter(this) {

        override fun getItemCount(): Int = tabInfos.size

        override fun createFragment(position: Int): Fragment {
            // Return a NEW fragment instance in createFragment(int)
            /*
            fragment.arguments = Bundle().apply {
                // Our object is just an integer :-P
                putInt(ARG_OBJECT, position + 1)
            } */
            return tabInfos[position].content
        }
    }

    private fun requestPermission() {
        debug("Checking permissions")

        val perms = mutableListOf(
            Manifest.permission.ACCESS_COARSE_LOCATION,
            Manifest.permission.ACCESS_FINE_LOCATION,
            Manifest.permission.BLUETOOTH,
            Manifest.permission.BLUETOOTH_ADMIN,
            Manifest.permission.WAKE_LOCK,
            Manifest.permission.WRITE_EXTERNAL_STORAGE
        )

        if (Build.VERSION.SDK_INT >= 29) // only added later
            perms.add(Manifest.permission.ACCESS_BACKGROUND_LOCATION)

        val missingPerms = perms.filter {
            ContextCompat.checkSelfPermission(
                this,
                it
            ) != PackageManager.PERMISSION_GRANTED
        }
        if (missingPerms.isNotEmpty()) {
            missingPerms.forEach {
                // Permission is not granted
                // Should we show an explanation?
                if (ActivityCompat.shouldShowRequestPermissionRationale(this, it)) {
                    // FIXME
                    // Show an explanation to the user *asynchronously* -- don't block
                    // this thread waiting for the user's response! After the user
                    // sees the explanation, try again to request the permission.
                }
            }

            // Ask for all the missing perms
            ActivityCompat.requestPermissions(
                this,
                missingPerms.toTypedArray(),
                DID_REQUEST_PERM
            )

            // DID_REQUEST_PERM is an
            // app-defined int constant. The callback method gets the
            // result of the request.
        } else {
            // Permission has already been granted
        }
    }


    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
    }


    private fun sendTestPackets() {
        exceptionReporter {
            val m = UIState.meshService!!

            // Do some test operations
            val testPayload = "hello world".toByteArray()
            m.sendData(
                "+16508675310",
                testPayload,
                MeshProtos.Data.Type.SIGNAL_OPAQUE_VALUE
            )
            m.sendData(
                "+16508675310",
                testPayload,
                MeshProtos.Data.Type.CLEAR_TEXT_VALUE
            )
        }
    }


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

        val prefs = UIState.getPreferences(this)
        UIState.ownerName = prefs.getString("owner", "")!!
        UIState.meshService = null
        UIState.savedInstanceState = savedInstanceState

        // Ensures Bluetooth is available on the device and it is enabled. If not,
        // displays a dialog requesting user permission to enable Bluetooth.
        if (bluetoothAdapter != null) {
            bluetoothAdapter!!.takeIf { !it.isEnabled }?.apply {
                val enableBtIntent = Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)
                startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT)
            }
        } else {
            Toast.makeText(
                this,
                "Error - this app requires bluetooth",
                Toast.LENGTH_LONG
            )
                .show()
        }

        requestPermission()


        /*  not yet working
        // Configure sign-in to request the user's ID, email address, and basic
// profile. ID and basic profile are included in DEFAULT_SIGN_IN.
        // Configure sign-in to request the user's ID, email address, and basic
// profile. ID and basic profile are included in DEFAULT_SIGN_IN.
        val gso =
            GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .build()

        // Build a GoogleSignInClient with the options specified by gso.
        UIState.googleSignInClient = GoogleSignIn.getClient(this, gso);

         */

        // Handle any intent
        handleIntent(intent)

        /* setContent {
            MeshApp()
        } */
        setContentView(R.layout.activity_main)

        val tab_layout = findViewById<TabLayout>(R.id.tab_layout)
        val pager = findViewById<ViewPager2>(R.id.pager)
        pager.adapter = tabsAdapter
        TabLayoutMediator(tab_layout, pager) { tab, position ->
            tab.text = tabInfos[position].text
            tab.icon = getDrawable(tabInfos[position].icon)
        }.attach()
    }


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

    /// Handle any itents that were passed into us
    private fun handleIntent(intent: Intent) {
        val appLinkAction = intent.action
        val appLinkData: Uri? = intent.data

        UIState.requestedChannelUrl = null // assume none

        // Were we asked to open one our channel URLs?
        if (Intent.ACTION_VIEW == appLinkAction) {
            debug("Asked to open a channel URL - FIXME, ask user if they want to switch to that channel.  If so send the config to the radio")
            UIState.requestedChannelUrl = appLinkData
        }
    }

    override fun onDestroy() {
        unregisterMeshReceiver()
        UIState.meshService =
            null // When our activity goes away make sure we don't keep a ptr around to the service
        super.onDestroy()
    }

    /**
     * Dispatch incoming result to the correct fragment.
     */
    override fun onActivityResult(
        requestCode: Int,
        resultCode: Int,
        data: Intent?
    ) {
        super.onActivityResult(requestCode, resultCode, data)

        // Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);
        // Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            // The Task returned from this call is always completed, no need to attach
            // a listener.
            val task: Task<GoogleSignInAccount> =
                GoogleSignIn.getSignedInAccountFromIntent(data)
            handleSignInResult(task)
        }
    }

    private fun handleSignInResult(completedTask: Task<GoogleSignInAccount>) {
        /*
        try {
            val account = completedTask.getResult(ApiException::class.java)
            // Signed in successfully, show authenticated UI.
            //updateUI(account)
        } catch (e: ApiException) { // The ApiException status code indicates the detailed failure reason.
// Please refer to the GoogleSignInStatusCodes class reference for more information.
            warn("signInResult:failed code=" + e.statusCode)
            //updateUI(null)
        } */
    }

    private
    var receiverRegistered = false

    private fun registerMeshReceiver() {
        logAssert(!receiverRegistered)
        val filter = IntentFilter()
        filter.addAction(MeshService.ACTION_MESH_CONNECTED)
        filter.addAction(MeshService.ACTION_NODE_CHANGE)
        filter.addAction(MeshService.ACTION_RECEIVED_DATA)
        registerReceiver(meshServiceReceiver, filter)
        receiverRegistered = true;
    }

    private fun unregisterMeshReceiver() {
        if (receiverRegistered) {
            receiverRegistered = false
            unregisterReceiver(meshServiceReceiver)
        }
    }

    /// Read the config bytes from the radio so we can show them in our GUI, the radio's copy is ground truth
    private fun readRadioConfig() {
        val bytes = UIState.meshService!!.radioConfig

        val config = MeshProtos.RadioConfig.parseFrom(bytes)
        UIState.setRadioConfig(this, config)

        debug("Read config from radio")
    }

    /// Called when we gain/lose a connection to our mesh radio
    private fun onMeshConnectionChanged(connected: MeshService.ConnectionState) {
        UIState.isConnected.value = connected
        debug("connchange ${UIState.isConnected.value}")
        if (connected == MeshService.ConnectionState.CONNECTED) {
            // always get the current radio config when we connect
            readRadioConfig()

            // everytime the radio reconnects, we slam in our current owner data, the radio is smart enough to only broadcast if needed
            UIState.setOwner(this)

            val m = UIState.meshService!!

            // Pull down our real node ID
            NodeDB.myId.value = m.myId

            // Update our nodeinfos based on data from the device
            NodeDB.nodes.clear()
            NodeDB.nodes.putAll(
                m.nodes.map
                {
                    it.user?.id!! to it
                }
            )
        }
    }

    override fun dispatchTouchEvent(ev: MotionEvent?): Boolean {
        return try {
            super.dispatchTouchEvent(ev)
        } catch (ex: Throwable) {
            Exceptions.report(
                ex,
                "dispatchTouchEvent"
            ) // hide this Compose error from the user but report to the mothership
            false
        }
    }

    private
    val meshServiceReceiver = object : BroadcastReceiver() {

        override fun onReceive(context: Context, intent: Intent) =
            exceptionReporter {
                debug("Received from mesh service $intent")

                when (intent.action) {
                    MeshService.ACTION_NODE_CHANGE -> {
                        val info: NodeInfo =
                            intent.getParcelableExtra(EXTRA_NODEINFO)!!
                        debug("UI nodechange $info")

                        // We only care about nodes that have user info
                        info.user?.id?.let {
                            NodeDB.nodes[it] = info
                        }
                    }

                    MeshService.ACTION_RECEIVED_DATA -> {
                        debug("TODO rxdata")
                        val sender =
                            intent.getStringExtra(EXTRA_SENDER)!!
                        val payload =
                            intent.getByteArrayExtra(EXTRA_PAYLOAD)!!
                        val typ = intent.getIntExtra(EXTRA_TYP, -1)

                        when (typ) {
                            MeshProtos.Data.Type.CLEAR_TEXT_VALUE -> {
                                // FIXME - use the real time from the packet
                                // FIXME - don't just slam in a new list each time, it probably causes extra drawing.  Figure out how to be Compose smarter...
                                val msg = TextMessage(
                                    sender,
                                    payload.toString(utf8)
                                )

                                MessagesState.addMessage(msg)
                            }
                            else -> TODO()
                        }
                    }
                    MeshService.ACTION_MESH_CONNECTED -> {
                        val connected =
                            MeshService.ConnectionState.valueOf(
                                intent.getStringExtra(
                                    EXTRA_CONNECTED
                                )!!
                            )
                        onMeshConnectionChanged(connected)
                    }
                    else -> TODO()
                }
            }
    }


    private
    val mesh = object :
        ServiceClient<com.geeksville.mesh.IMeshService>({
            com.geeksville.mesh.IMeshService.Stub.asInterface(it)
        }) {
        override fun onConnected(service: com.geeksville.mesh.IMeshService) {
            UIState.meshService = service

            // We don't start listening for packets until after we are connected to the service
            registerMeshReceiver()

            // We won't receive a notify for the initial state of connection, so we force an update here
            val connectionState =
                MeshService.ConnectionState.valueOf(service.connectionState())
            onMeshConnectionChanged(connectionState)

            debug("connected to mesh service, isConnected=${UIState.isConnected.value}")
        }

        override fun onDisconnected() {
            unregisterMeshReceiver()
            UIState.meshService = null
        }
    }

    private fun bindMeshService() {
        debug("Binding to mesh service!")
        // we bind using the well known name, to make sure 3rd party apps could also
        if (UIState.meshService != null)
            Exceptions.reportError("meshService was supposed to be null, ignoring (but reporting a bug)")

        MeshService.startService(this)?.let { intent ->
            // ALSO bind so we can use the api
            mesh.connect(this, intent, Context.BIND_AUTO_CREATE)
        }
    }

    private fun unbindMeshService() {
        // If we have received the service, and hence registered with
        // it, then now is the time to unregister.
        // if we never connected, do nothing
        debug("Unbinding from mesh service!")
        mesh.close()
        UIState.meshService = null
    }

    override fun onStop() {
        ScanState.stopScan()
        unregisterMeshReceiver() // No point in receiving updates while the GUI is gone, we'll get them when the user launches the activity
        unbindMeshService()

        super.onStop()
    }

    override fun onStart() {
        super.onStart()

        bindMeshService()

        val bonded =
            RadioInterfaceService.getBondedDeviceAddress(this) != null
        /* FIXME - not yet working
        if (!bonded)
            AppStatus.currentScreen = Screen.settings
        */
    }

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        // Inflate the menu; this adds items to the action bar if it is present.
        menuInflater.inflate(R.menu.menu_main, menu)
        return true
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        return when (item.itemId) {
            R.id.action_settings -> true
            else -> super.onOptionsItemSelected(item)
        }
    }
}