package com.geeksville.mesh.ui

import android.bluetooth.BluetoothDevice
import android.companion.CompanionDeviceManager
import android.content.*
import android.location.LocationManager
import android.os.*
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.view.inputmethod.EditorInfo
import android.widget.*
import androidx.activity.result.contract.ActivityResultContracts
import androidx.fragment.app.activityViewModels
import com.geeksville.mesh.analytics.DataPair
import com.geeksville.mesh.android.GeeksvilleApplication
import com.geeksville.mesh.android.Logging
import com.geeksville.mesh.android.hideKeyboard
import com.geeksville.mesh.android.isGooglePlayAvailable
import com.geeksville.mesh.MainActivity
import com.geeksville.mesh.R
import com.geeksville.mesh.ConfigProtos
import com.geeksville.mesh.android.*
import com.geeksville.mesh.databinding.SettingsFragmentBinding
import com.geeksville.mesh.model.BTScanModel
import com.geeksville.mesh.model.BluetoothViewModel
import com.geeksville.mesh.model.UIViewModel
import com.geeksville.mesh.repository.radio.MockInterface
import com.geeksville.mesh.repository.usb.UsbRepository
import com.geeksville.mesh.service.MeshService
import com.geeksville.mesh.service.SoftwareUpdateService
import com.geeksville.mesh.util.exceptionToSnackbar
import com.google.android.material.dialog.MaterialAlertDialogBuilder
import com.google.android.material.snackbar.Snackbar
import dagger.hilt.android.AndroidEntryPoint
import javax.inject.Inject

object SLogging : Logging

/// Change to a new macaddr selection, updating GUI and radio
fun changeDeviceSelection(context: MainActivity, newAddr: String?) {
    // FIXME, this is a kinda yucky way to find the service
    context.model.meshService?.let { service ->
        MeshService.changeDeviceAddress(context, service, newAddr)
    }
}

@AndroidEntryPoint
class SettingsFragment : ScreenFragment("Settings"), Logging {
    private var _binding: SettingsFragmentBinding? = null

    // This property is only valid between onCreateView and onDestroyView.
    private val binding get() = _binding!!

    private val scanModel: BTScanModel by activityViewModels()
    private val bluetoothViewModel: BluetoothViewModel by activityViewModels()
    private val model: UIViewModel by activityViewModels()

    @Inject
    internal lateinit var usbRepository: UsbRepository

    private val myActivity get() = requireActivity() as MainActivity

    private fun doFirmwareUpdate() {
        model.meshService?.let { service ->

            debug("User started firmware update")
            GeeksvilleApplication.analytics.track(
                "firmware_update",
                DataPair("content_type", "start")
            )
            binding.updateFirmwareButton.isEnabled = false // Disable until things complete
            binding.updateProgressBar.visibility = View.VISIBLE
            binding.updateProgressBar.progress = 0 // start from scratch

            exceptionToSnackbar(requireView()) {
                // We rely on our broadcast receiver to show progress as this progresses
                service.startFirmwareUpdate()
            }
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        _binding = SettingsFragmentBinding.inflate(inflater, container, false)
        return binding.root
    }

    /// Set the correct update button configuration based on current progress
    private fun refreshUpdateButton(enable: Boolean) {
        debug("Reiniting the update button")
        val info = model.myNodeInfo.value
        val service = model.meshService
        if (model.isConnected() && info != null && info.shouldUpdate && info.couldUpdate && service != null) {
            binding.updateFirmwareButton.visibility = View.VISIBLE
            binding.updateFirmwareButton.text =
                getString(R.string.update_to).format(getString(R.string.short_firmware_version))

            val progress = service.updateStatus

            binding.updateFirmwareButton.isEnabled = enable &&
                (progress < 0) // if currently doing an upgrade disable button

            if (progress >= 0) {
                binding.updateProgressBar.progress = progress // update partial progress
                binding.scanStatusText.setText(R.string.updating_firmware)
                binding.updateProgressBar.visibility = View.VISIBLE
            } else
                when (progress) {
                    SoftwareUpdateService.ProgressSuccess -> {
                        GeeksvilleApplication.analytics.track(
                            "firmware_update",
                            DataPair("content_type", "success")
                        )
                        binding.scanStatusText.setText(R.string.update_successful)
                        binding.updateProgressBar.visibility = View.GONE
                    }
                    SoftwareUpdateService.ProgressNotStarted -> {
                        // Do nothing - because we don't want to overwrite the status text in this case
                        binding.updateProgressBar.visibility = View.GONE
                    }
                    else -> {
                        GeeksvilleApplication.analytics.track(
                            "firmware_update",
                            DataPair("content_type", "failure")
                        )
                        binding.scanStatusText.setText(R.string.update_failed)
                        binding.updateProgressBar.visibility = View.VISIBLE
                    }
                }
            binding.updateProgressBar.isEnabled = false

        } else {
            binding.updateFirmwareButton.visibility = View.GONE
            binding.updateProgressBar.visibility = View.GONE
        }
    }

    /**
     * Pull the latest device info from the model and into the GUI
     */
    private fun updateNodeInfo() {
        val connected = model.connectionState.value

        binding.nodeSettings.visibility = if (model.isConnected()) View.VISIBLE else View.GONE
        binding.provideLocationCheckbox.visibility = if (model.isConnected()) View.VISIBLE else View.GONE

        if (connected == MeshService.ConnectionState.DISCONNECTED)
            model.setOwner("")

        if (model.gpsDisabled) {
            model.provideLocation.value = false
            binding.provideLocationCheckbox.isChecked = false
        } else {
            binding.provideLocationCheckbox.isEnabled = isGooglePlayAvailable(requireContext())
        }

        // update the region selection from the device
        val region = model.region
        val spinner = binding.regionSpinner
        val unsetIndex = regions.indexOf(ConfigProtos.Config.LoRaConfig.RegionCode.Unset.name)
        spinner.onItemSelectedListener = null

        debug("current region is $region")
        var regionIndex = regions.indexOf(region.name)
        if (regionIndex == -1) // Not found, probably because the device has a region our app doesn't yet understand.  Punt and say Unset
            regionIndex = unsetIndex

        // We don't want to be notified of our own changes, so turn off listener while making them
        spinner.setSelection(regionIndex, false)
        spinner.onItemSelectedListener = regionSpinnerListener
        spinner.isEnabled = true

        // If actively connected possibly let the user update firmware
        refreshUpdateButton(model.isConnected())

        // Update the status string (highest priority messages first)
        val info = model.myNodeInfo.value
        val statusText = binding.scanStatusText
        when (connected) {
            MeshService.ConnectionState.CONNECTED -> {
                statusText.text = if (region.number == 0) getString(R.string.must_set_region)
                else getString(R.string.connected_to).format(info?.firmwareString ?: "unknown")
            }
            MeshService.ConnectionState.DISCONNECTED ->
                statusText.text = getString(R.string.not_connected)
            MeshService.ConnectionState.DEVICE_SLEEP ->
                statusText.text = getString(R.string.connected_sleeping)
            else -> {}
        }
    }

    private val regionSpinnerListener = object : AdapterView.OnItemSelectedListener {
        override fun onItemSelected(
            parent: AdapterView<*>,
            view: View,
            position: Int,
            id: Long
        ) {
            val item = parent.getItemAtPosition(position) as String?
            val asProto = item!!.let { ConfigProtos.Config.LoRaConfig.RegionCode.valueOf(it) }
            exceptionToSnackbar(requireView()) {
                model.region = asProto
            }
            updateNodeInfo() // We might have just changed Unset to set
        }

        override fun onNothingSelected(parent: AdapterView<*>) {
            //TODO("Not yet implemented")
        }
    }

    /// the sorted list of region names like arrayOf("US", "CN", "EU488")
    private val regions = ConfigProtos.Config.LoRaConfig.RegionCode.values().filter {
        it != ConfigProtos.Config.LoRaConfig.RegionCode.UNRECOGNIZED
    }.map {
        it.name
    }.sorted()

    private fun initCommonUI() {

        val associationResultLauncher = registerForActivityResult(
            ActivityResultContracts.StartIntentSenderForResult()
        ) {
            it.data
                ?.getParcelableExtra<BluetoothDevice>(CompanionDeviceManager.EXTRA_DEVICE)
                ?.let { device ->
                    scanModel.onSelected(
                        myActivity,
                        BTScanModel.DeviceListEntry(
                            device.name,
                            "x${device.address}",
                            device.bondState == BluetoothDevice.BOND_BONDED
                        )
                    )
                }
        }

        val requestBackgroundAndCheckLauncher =
            registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { permissions ->
                if (permissions.entries.all { it.value }) {
                    binding.provideLocationCheckbox.isChecked = true
                }
            }

        val requestLocationAndBackgroundLauncher =
            registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { permissions ->
                if (permissions.entries.all { it.value }) {
                    // Older versions of android only need Location permission
                    if (myActivity.hasBackgroundPermission()) {
                        binding.provideLocationCheckbox.isChecked = true
                    } else requestBackgroundAndCheckLauncher.launch(myActivity.getBackgroundPermissions())
                }
            }

        // init our region spinner
        val spinner = binding.regionSpinner
        val regionAdapter =
            ArrayAdapter(requireContext(), android.R.layout.simple_spinner_item, regions)
        regionAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
        spinner.adapter = regionAdapter

        bluetoothViewModel.enabled.observe(viewLifecycleOwner) { enabled ->
            if (enabled) scanModel.setupScan()
        }

        model.ownerName.observe(viewLifecycleOwner) { name ->
            binding.usernameEditText.isEnabled = !name.isNullOrEmpty()
            binding.usernameEditText.setText(name)
        }

        // Only let user edit their name or set software update while connected to a radio
        model.connectionState.observe(viewLifecycleOwner) {
            updateNodeInfo()
            updateDevicesButtons(scanModel.devices.value)
        }

        model.localConfig.observe(viewLifecycleOwner) {
            if (!model.isConnected()) {
                val configCount = it.allFields.size
                binding.scanStatusText.text = "Device config ($configCount / 7)"
            } else updateNodeInfo()
        }

        model.channels.observe(viewLifecycleOwner) {
            if (!model.isConnected()) {
                val channelCount = it?.protobuf?.settingsCount ?: 0
                binding.scanStatusText.text = "Channels ($channelCount / 8)"
            }
        }

        // Also watch myNodeInfo because it might change later
        model.myNodeInfo.observe(viewLifecycleOwner) {
            updateNodeInfo()
        }

        scanModel.devices.observe(viewLifecycleOwner) { devices ->
            updateDevicesButtons(devices)
        }

        scanModel.errorText.observe(viewLifecycleOwner) { errMsg ->
            if (errMsg != null) {
                binding.scanStatusText.text = errMsg
            }
        }

        // show the spinner when [spinner] is true
        scanModel.spinner.observe(viewLifecycleOwner) { show ->
            binding.scanProgressBar.visibility = if (show) View.VISIBLE else View.GONE
        }

        scanModel.associationRequest.observe(viewLifecycleOwner) { request ->
            request?.let {
                associationResultLauncher.launch(request)
                scanModel.clearAssociationRequest()
            }
        }

        binding.updateFirmwareButton.setOnClickListener {
            MaterialAlertDialogBuilder(requireContext())
                .setMessage("${getString(R.string.update_firmware)}?")
                .setNeutralButton(R.string.cancel) { _, _ ->
                }
                .setPositiveButton(getString(R.string.okay)) { _, _ ->
                    doFirmwareUpdate()
                }
                .show()
        }

        binding.usernameEditText.on(EditorInfo.IME_ACTION_DONE) {
            debug("did IME action")
            val n = binding.usernameEditText.text.toString().trim()
            if (n.isNotEmpty())
                model.setOwner(n)
            requireActivity().hideKeyboard()
        }

        binding.provideLocationCheckbox.setOnCheckedChangeListener { view, isChecked ->
            if (view.isPressed && isChecked) { // We want to ignore changes caused by code (as opposed to the user)
                // Don't check the box until the system setting changes
                view.isChecked = myActivity.hasBackgroundPermission()

                if (!myActivity.hasBackgroundPermission())
                    MaterialAlertDialogBuilder(requireContext())
                        .setTitle(R.string.background_required)
                        .setMessage(R.string.why_background_required)
                        .setNeutralButton(R.string.cancel) { _, _ ->
                            debug("User denied background permission")
                        }
                        .setPositiveButton(getString(R.string.accept)) { _, _ ->
                            // Make sure we have location permission (prerequisite)
                            if (!myActivity.hasLocationPermission()) {
                                requestLocationAndBackgroundLauncher.launch(myActivity.getLocationPermissions())
                            } else {
                                requestBackgroundAndCheckLauncher.launch(myActivity.getBackgroundPermissions())
                            }
                        }
                        .show()
                if (view.isChecked) {
                    debug("User changed location tracking to $isChecked")
                    model.provideLocation.value = isChecked
                    checkLocationEnabled(getString(R.string.location_disabled))
                    model.meshService?.startProvideLocation()
                }
            } else {
                model.provideLocation.value = isChecked
                model.meshService?.stopProvideLocation()
            }
        }

        val app = (requireContext().applicationContext as GeeksvilleApplication)

        // Set analytics checkbox
        binding.analyticsOkayCheckbox.isChecked = app.isAnalyticsAllowed

        binding.analyticsOkayCheckbox.setOnCheckedChangeListener { _, isChecked ->
            debug("User changed analytics to $isChecked")
            app.isAnalyticsAllowed = isChecked
            binding.reportBugButton.isEnabled = app.isAnalyticsAllowed
        }

        // report bug button only enabled if analytics is allowed
        binding.reportBugButton.isEnabled = app.isAnalyticsAllowed
        binding.reportBugButton.setOnClickListener {
            MaterialAlertDialogBuilder(requireContext())
                .setTitle(R.string.report_a_bug)
                .setMessage(getString(R.string.report_bug_text))
                .setNeutralButton(R.string.cancel) { _, _ ->
                    debug("Decided not to report a bug")
                }
                .setPositiveButton(getString(R.string.report)) { _, _ ->
                    reportError("Clicked Report A Bug")
                    Toast.makeText(requireContext(), "Bug report sent!", Toast.LENGTH_LONG).show()
                }
                .show()
        }
    }

    private fun addDeviceButton(device: BTScanModel.DeviceListEntry, enabled: Boolean) {
        val b = RadioButton(requireActivity())
        b.text = device.name
        b.id = View.generateViewId()
        b.isEnabled = enabled
        b.isChecked = device.fullAddress == scanModel.selectedNotNull
        binding.deviceRadioGroup.addView(b)

        b.setOnClickListener {
            if (!device.bonded) // If user just clicked on us, try to bond
                binding.scanStatusText.setText(R.string.starting_pairing)

            b.isChecked =
                scanModel.onSelected(myActivity, device)
        }
    }

    private fun updateDevicesButtons(devices: MutableMap<String, BTScanModel.DeviceListEntry>?) {
        // Remove the old radio buttons and repopulate
        binding.deviceRadioGroup.removeAllViews()

        if (devices == null) return

        var hasShownOurDevice = false
        devices.values.forEach { device ->
            if (device.fullAddress == scanModel.selectedNotNull)
                hasShownOurDevice = true
            addDeviceButton(device, true)
        }

        // The selected device is not in the scan; it is either offline, or it doesn't advertise
        // itself (most BLE devices don't advertise when connected).
        // Show it in the list, greyed out based on connection status.
        if (!hasShownOurDevice) {
            // Note: we pull this into a tempvar, because otherwise some other thread can change selectedAddress after our null check
            // and before use
            val curAddr = scanModel.selectedAddress
            if (curAddr != null) {
                val curDevice = scanModel.getDeviceListEntry(curAddr)
                addDeviceButton(curDevice, model.isConnected())
            }
        }

        // get rid of the warning text once at least one device is paired.
        // If we are running on an emulator, always leave this message showing so we can test the worst case layout
        val curRadio = scanModel.selectedAddress

        if (curRadio != null && !MockInterface.addressValid(requireContext(), usbRepository, "")) {
            binding.warningNotPaired.visibility = View.GONE
            // binding.scanStatusText.text = getString(R.string.current_pair).format(curRadio)
        } else if (bluetoothViewModel.enabled.value == true){
            binding.warningNotPaired.visibility = View.VISIBLE
            binding.scanStatusText.text = getString(R.string.not_paired_yet)
        }
    }

    // per https://developer.android.com/guide/topics/connectivity/bluetooth/find-ble-devices
    private fun scanLeDevice() {
        var scanning = false
        val SCAN_PERIOD: Long = 10000 // Stops scanning after 10 seconds

        if (!scanning) { // Stops scanning after a pre-defined scan period.
            Handler(Looper.getMainLooper()).postDelayed({
                scanning = false
                scanModel.stopScan()
            }, SCAN_PERIOD)
            scanning = true
            scanModel.startScan()
        } else {
            scanning = false
            scanModel.stopScan()
        }
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        initCommonUI()

        val requestPermissionAndScanLauncher =
            registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { permissions ->
                if (permissions.entries.all { it.value }) {
                    checkLocationEnabled()
                    scanLeDevice()
                } else {
                    errormsg("User denied scan permissions")
                    showSnackbar(getString(R.string.permission_missing))
                }
            }

        binding.changeRadioButton.setOnClickListener {
            debug("User clicked changeRadioButton")
            checkBTEnabled()
            if ((scanModel.hasCompanionDeviceApi)) {
                scanLeDevice()
            } else  {
                // Location is the only runtime permission for classic bluetooth scan
                if (myActivity.hasLocationPermission()) {
                    checkLocationEnabled()
                    scanLeDevice()
                } else {
                    MaterialAlertDialogBuilder(requireContext())
                        .setTitle(getString(R.string.required_permissions))
                        .setMessage(getString(R.string.permission_missing))
                        .setNeutralButton(R.string.cancel) { _, _ ->
                            warn("User bailed due to permissions")
                        }
                        .setPositiveButton(R.string.accept) { _, _ ->
                            info("requesting scan permissions")
                            requestPermissionAndScanLauncher.launch(myActivity.getLocationPermissions())
                        }
                        .show()
                }
            }
        }
    }

    // If the user has not turned on location access throw up a warning
    private fun checkLocationEnabled(
        // Default warning valid only for classic bluetooth scan
        warningReason: String = getString(R.string.location_disabled_warning)
    ) {
        val locationManager =
            myActivity.getSystemService(Context.LOCATION_SERVICE) as LocationManager
        var gpsEnabled = false

        try {
            gpsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)
        } catch (ex: Throwable) {
            debug("LocationManager GPS_PROVIDER error: ${ex.message}")
        }

        if (myActivity.hasGps() && !gpsEnabled) {
            warn("Telling user we need need location access")
            showSnackbar(warningReason)
        }
    }

    private fun checkBTEnabled(
        warningReason: String = getString(R.string.bluetooth_disabled)
    ) {
        if (bluetoothViewModel.enabled.value == false) {
            warn("Telling user bluetooth is disabled")
            Toast.makeText(requireContext(), warningReason, Toast.LENGTH_LONG).show()
        }
    }

    private val updateProgressFilter = IntentFilter(SoftwareUpdateService.ACTION_UPDATE_PROGRESS)

    private val updateProgressReceiver: BroadcastReceiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context?, intent: Intent?) {
            refreshUpdateButton(true)
        }
    }

    private fun showSnackbar(msg: String) {
        try {
            Snackbar.make(
                requireView(),
                msg,
                Snackbar.LENGTH_INDEFINITE
            )
                .apply { view.findViewById<TextView>(R.id.snackbar_text).isSingleLine = false }
                .setAction(R.string.okay) {
                    // dismiss
                }
                .show()
        } catch (ex: IllegalStateException) {
            errormsg("Snackbar couldn't find view for msgString $msg")
        }
    }

    override fun onPause() {
        super.onPause()

        requireActivity().unregisterReceiver(updateProgressReceiver)
    }

    override fun onResume() {
        super.onResume()

        scanModel.setupScan()

        // system permissions might have changed while we were away
        binding.provideLocationCheckbox.isChecked = myActivity.hasBackgroundPermission() && (model.provideLocation.value ?: false) && isGooglePlayAvailable(requireContext())

        myActivity.registerReceiver(updateProgressReceiver, updateProgressFilter)

        // Warn user if BLE device is selected but BLE disabled
        if (scanModel.selectedBluetooth) checkBTEnabled()

        // Warn user if provide location is selected but location disabled
        if (binding.provideLocationCheckbox.isChecked)
            checkLocationEnabled(getString(R.string.location_disabled))
    }
}