package com.geeksville.meshutil

import android.Manifest
import android.bluetooth.*
import android.content.Context
import android.content.Intent
import android.content.pm.PackageManager
import android.os.Bundle
import android.os.Handler
import android.util.Log
import com.google.android.material.snackbar.Snackbar
import androidx.appcompat.app.AppCompatActivity
import android.view.Menu
import android.view.MenuItem
import android.widget.Toast
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import com.geeksville.android.Logging

import kotlinx.android.synthetic.main.activity_main.*
import java.util.*


class MainActivity : AppCompatActivity(), Logging {

    companion object {
        const val REQUEST_ENABLE_BT = 10
        const val DID_REQUEST_PERM = 11
    }

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

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

        val perms = arrayOf(Manifest.permission.ACCESS_FINE_LOCATION,
            Manifest.permission.ACCESS_BACKGROUND_LOCATION,
            Manifest.permission.BLUETOOTH,
            Manifest.permission.BLUETOOTH_ADMIN,
            Manifest.permission.WAKE_LOCK)

        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 onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setSupportActionBar(toolbar)

        fab.setOnClickListener { _ ->
            /* Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                .setAction("Action", null).show() */

            // test crash reporting
            // logAssert(false)
            // throw NotImplementedError("I like crap")

            if(bluetoothAdapter != null) {
                SoftwareUpdateService.enqueueWork(this, SoftwareUpdateService.scanDevicesIntent)
            }
        }

        // 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()
    }

    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)
        }
    }
}