package com.geeksville.mesh

import android.Manifest
import android.bluetooth.BluetoothAdapter
import android.bluetooth.BluetoothManager
import android.content.*
import android.content.pm.PackageManager
import android.os.Build
import android.os.Bundle
import android.os.IBinder
import android.view.Menu
import android.view.MenuItem
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import androidx.ui.core.setContent
import com.geeksville.android.Logging
import com.geeksville.mesh.service.*
import com.geeksville.mesh.ui.MeshApp
import com.geeksville.mesh.ui.TextMessage
import com.geeksville.mesh.ui.UIState
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.auth.api.signin.GoogleSignInOptions
import com.google.android.gms.common.api.ApiException
import com.google.android.gms.tasks.Task
import java.nio.charset.Charset
import java.util.*


/*
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
  username
  shortname
  bluetooth pairing list
  (eventually misc device settings that are not channel related)

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

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

NodeListFragment
  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
*/

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

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

    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 setOwner() {
        // Note: we are careful to not set a new unique ID
        meshService!!.setOwner(null, "Kevin Xter", "kx")
    }

    private fun sendTestPackets() {
        exceptionReporter {
            val m = 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)

        setContent {
            MeshApp()
        }

        // 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()

        // 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);
    }

    override fun onDestroy() {
        unregisterMeshReceiver()
        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)

    }

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

    /// Called when we gain/lose a connection to our mesh radio
    private fun onMeshConnectionChanged(connected: Boolean) {
        UIState.isConnected.value = connected
        debug("connchange ${UIState.isConnected.value}")
        if (connected) {
            // everytime the radio reconnects, we slam in our current owner data
            setOwner()
        }
    }

    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 {
                        val newnodes = UIState.nodes.value.toMutableMap()
                        newnodes[it] = info
                        UIState.nodes.value = newnodes
                    }
                }

                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
                            val modded = UIState.messages.value.toMutableList()
                            modded.add(TextMessage(Date(), sender, payload.toString(utf8)))
                            UIState.messages.value = modded
                        }
                        else -> TODO()
                    }
                }
                MeshService.ACTION_MESH_CONNECTED -> {
                    val connected = intent.getBooleanExtra(EXTRA_CONNECTED, false)
                    onMeshConnectionChanged(connected)
                }
                else -> TODO()
            }
        }
    }

    private var meshService: IMeshService? = null
    private var isBound = false

    private var serviceConnection = object : ServiceConnection {
        override fun onServiceConnected(name: ComponentName, service: IBinder) =
            exceptionReporter {
                val m = IMeshService.Stub.asInterface(service)
                meshService = m

                // 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
                onMeshConnectionChanged(m.isConnected)

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

                // make some placeholder nodeinfos
                UIState.nodes.value =
                    m.nodes.toList().map {
                        it.user?.id!! to it
                    }.toMap()
            }

        override fun onServiceDisconnected(name: ComponentName) {
            warn("The mesh service has disconnected")
            unregisterMeshReceiver()
            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
        logAssert(meshService == null)

        val intent = MeshService.startService(this)
        if (intent != null) {
            // ALSO bind so we can use the api
            logAssert(bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE))
            isBound = true;
        }
    }

    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!")
        if (isBound)
            unbindService(serviceConnection)
        meshService = null
    }

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

        super.onPause()
    }

    override fun onResume() {
        super.onResume()

        bindMeshService()
    }

    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)
        }
    }
}