package mx.trackermap.TrackerMap.android.map

import android.content.Intent
import android.os.Bundle
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.core.text.HtmlCompat
import androidx.fragment.app.Fragment
import androidx.fragment.app.viewModels
import kotlin.time.ExperimentalTime
import kotlinx.coroutines.DelicateCoroutinesApi
import mx.trackermap.TrackerMap.android.R
import mx.trackermap.TrackerMap.android.databinding.UnitMapFragmentBinding
import mx.trackermap.TrackerMap.android.details.DetailsActivity
import mx.trackermap.TrackerMap.android.shared.MarkerTransformations
import mx.trackermap.TrackerMap.android.shared.UnitRenderData
import mx.trackermap.TrackerMap.android.units.UnitsViewModel
import mx.trackermap.TrackerMap.client.models.MapLayer
import mx.trackermap.TrackerMap.client.models.UnitInformation

@DelicateCoroutinesApi
@ExperimentalTime
class UnitMapFragment : Fragment() {

    private val unitsViewModel: UnitsViewModel by viewModels(
        ownerProducer = { requireActivity() }
    )

    private var _binding: UnitMapFragmentBinding? = null
    private val binding get() = _binding!!
    private lateinit var unitsMapFragment: MapFragment

    private var shouldCenter = true

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

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

        initializeMap()
    }

    override fun onResume() {
        super.onResume()

        setupObservers()
    }

    override fun onPause() {
        super.onPause()

        removeObservers()
    }

    private fun initializeMap() {
        shouldCenter = true
        unitsMapFragment = childFragmentManager.findFragmentById(R.id.unitsMap) as MapFragment
        unitsMapFragment.markerCallback = unitsViewModel::selectUnitWith

        val layer = MapLayer.defaultLayer
        binding.attributionText.text = HtmlCompat.fromHtml(layer.attribution, 0)
    }

    private fun setupObservers() {
        Log.d("UnitMapFragment", "setupObservers()")

        unitsViewModel.units.observe(viewLifecycleOwner) { units ->
            Log.d("UnitMapFragment", "Available units: $units")
            unitsMapFragment.display(
                units.mapNotNull(MarkerTransformations::unitToMarker).toTypedArray(),
                isReport = false,
                center = shouldCenter
            )
            if (units.isNotEmpty()) {
                shouldCenter = false
            }
        }

        unitsViewModel.selectedUnit.observe(viewLifecycleOwner) { selectedUnit ->
            Log.d("UnitMapFragment", "Selected Unit: $selectedUnit")

            binding.mapUnitCard.visibility = if (selectedUnit == null) View.GONE else View.VISIBLE

            selectedUnit?.let { unit ->
                if (unit.position == null || unit.position!!.latitude == null || unit.position!!.longitude == null) {
                    return@let
                }

                UnitRenderData.render(
                    UnitRenderData.UnitRenderViewHolder(
                        unitName = binding.unitName,
                        statusIcon = binding.statusIcon,
                        engineStopIcon = binding.engineStopIcon,
                        gridLayout = binding.gridLayout,
                        detailsButton = binding.detailsButton,
                        reportsButton = binding.reportsButton,
                        commandsButton = binding.commandsButton
                    ), binding.mapUnitCard.context, unit, this::itemAction
                )

                unitsMapFragment.focusOn(unit.position!!.latitude!!, unit.position!!.longitude!!)
            }
        }

        unitsViewModel.mapLayerType.observe(viewLifecycleOwner) { type ->
            Log.d("UnitMapFragment", "Loading layer!")
            unitsMapFragment.updateLayer(type)
            unitsViewModel.selectedUnit.value?.let {
                unitsMapFragment.focusOn(it.position!!.latitude!!, it.position!!.longitude!!)
            }
            val layer = MapLayer.layers[type]!!
            binding.attributionText.text = HtmlCompat.fromHtml(layer.attribution, 0)
        }

        unitsViewModel.geofences.observe(viewLifecycleOwner) { geofences ->
            unitsMapFragment.displayGeofences(geofences.values.toTypedArray())
        }
    }

    private fun removeObservers() {
        Log.d("UnitMapFragment", "removeObservers()")
        unitsViewModel.units.removeObservers(viewLifecycleOwner)
        unitsViewModel.selectedUnit.removeObservers(viewLifecycleOwner)
        unitsViewModel.mapLayerType.removeObservers(viewLifecycleOwner)
        unitsViewModel.geofences.removeObservers(viewLifecycleOwner)
    }

    private fun itemAction(unit: UnitInformation, action: UnitRenderData.Action) {
        when (action) {
            UnitRenderData.Action.DETAILS,
            UnitRenderData.Action.REPORTS,
            UnitRenderData.Action.COMMANDS -> {
                Log.d("UnitMapFragment", "Action: $action - Unit: $unit")
                val activity = requireActivity()
                val intent = Intent(activity.applicationContext, DetailsActivity::class.java)
                intent.putExtra(DetailsActivity.DEVICE_ID_EXTRA, unit.device.id)
                intent.putExtra(DetailsActivity.DEVICE_NAME_EXTRA, unit.device.name)
                intent.putExtra(DetailsActivity.DEVICE_CATEGORY_EXTRA, unit.device.category)
                intent.putExtra(DetailsActivity.ACTION_EXTRA, action)
                startActivity(intent)
            }
            UnitRenderData.Action.CLICK -> {
                unitsViewModel.selectUnit(unit)
            }
        }
    }

}