/**
 * TrackerMap
 * Copyright (C) 2021-2022  Iván Ávalos <avalos@disroot.org>, Henoch Ojeda <imhenoch@protonmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package mx.trackermap.TrackerMap.android.units

import android.content.Context
import android.content.Intent
import android.os.Build
import android.os.Bundle
import android.text.Editable
import android.text.TextWatcher
import android.util.Log
import android.view.View
import android.view.inputmethod.InputMethodManager
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.TooltipCompat
import androidx.core.widget.doAfterTextChanged
import androidx.fragment.app.commit
import kotlinx.coroutines.DelicateCoroutinesApi
import mx.trackermap.TrackerMap.android.R
import mx.trackermap.TrackerMap.android.databinding.UnitsActivityBinding
import mx.trackermap.TrackerMap.android.devices.DevicesFragment
import mx.trackermap.TrackerMap.android.map.UnitMapFragment
import mx.trackermap.TrackerMap.android.session.UserInformationActivity
import mx.trackermap.TrackerMap.android.shared.Utils
import org.koin.androidx.viewmodel.ext.android.viewModel
import java.util.*
import kotlin.time.ExperimentalTime

@DelicateCoroutinesApi
@ExperimentalTime
class UnitsActivity : AppCompatActivity() {

    private var _binding: UnitsActivityBinding? = null
    private val binding get() = _binding!!

    private val unitsViewModel: UnitsViewModel by viewModel()
    private val mapFragment: UnitMapFragment by lazy {
        UnitMapFragment()
    }
    private val devicesFragment: DevicesFragment by lazy {
        DevicesFragment()
    }

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

        _binding = UnitsActivityBinding.inflate(layoutInflater)
        setContentView(binding.root)

        setupViews()
        setupEvents()
    }

    override fun onResume() {
        super.onResume()

        setupObservers()
    }

    override fun onPause() {
        super.onPause()

        removeObservers()
    }

    override fun onDestroy() {
        super.onDestroy()
        _binding = null
    }

    private fun setupViews() {
        supportFragmentManager.commit {
            add(R.id.displayContainer, mapFragment)
            add(R.id.displayContainer, devicesFragment)
        }
        TooltipCompat.setTooltipText(binding.userButton, getString(R.string.open_profile))
        TooltipCompat.setTooltipText(binding.mapLayerToggle, getString(R.string.switch_layer))
    }

    private fun setupEvents() {
        binding.userButton.setOnClickListener {
            val intent = Intent(applicationContext, UserInformationActivity::class.java)
            startActivity(intent)
        }
        binding.displayModeToggle.setOnClickListener {
            unitsViewModel.toggleDisplayMode()
        }
        binding.mapLayerToggle.setOnClickListener {
            showLayersPopUp(it)
        }
        binding.searchInput.addTextChangedListener(object: TextWatcher {
            override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {}
            override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {}

            var timer = Timer()
            val delay = 500L // milliseconds before doing search

            override fun afterTextChanged(p0: Editable?) {
                timer.cancel()
                timer = Timer()
                timer.schedule(object: TimerTask() {
                    override fun run() {
                        Log.d("UnitsActivity", "Search changed to $p0")
                        if (unitsViewModel.unitsDisplayMode.value == UnitsViewModel.UnitsDisplayMode.MAP) {
                            unitsViewModel.setDisplayMode(UnitsViewModel.UnitsDisplayMode.LIST)
                        }
                        unitsViewModel.search(p0.toString())
                    }
                }, delay)
            }

        })
        binding.searchInputLayout.setEndIconOnClickListener {
            unfocusSearch(true)
        }
    }

    private fun showLayersPopUp(view: View) {
        Utils.showLayersPopUp(this, view) {
            unitsViewModel.setMapLayerType(it)
        }
    }

    private fun unfocusSearch(clearText: Boolean = false) {
        val manager = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            this.getSystemService(InputMethodManager::class.java)
        } else {
            this.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
        }
        manager.hideSoftInputFromWindow(binding.searchInput.windowToken, 0)
        if (clearText) {
            binding.searchInput.text?.clear()
        }
        binding.searchInput.clearFocus()
    }

    private fun setupObservers() {
        unitsViewModel.unitsDisplayMode.observe(this) { displayMode ->
            binding.displayModeToggle.setImageResource(
                when (displayMode) {
                    UnitsViewModel.UnitsDisplayMode.LIST -> R.drawable.icon_map
                    UnitsViewModel.UnitsDisplayMode.MAP -> R.drawable.icon_list
                    else -> R.drawable.icon_list
                }
            )
            binding.displayModeToggle.contentDescription = getString(
                when (displayMode) {
                    UnitsViewModel.UnitsDisplayMode.LIST -> R.string.toggle_map
                    UnitsViewModel.UnitsDisplayMode.MAP -> R.string.toggle_list
                    else -> R.string.toggle_list
                }
            )
            TooltipCompat.setTooltipText(binding.displayModeToggle,
                getString(when (displayMode) {
                    UnitsViewModel.UnitsDisplayMode.LIST -> R.string.toggle_map
                    UnitsViewModel.UnitsDisplayMode.MAP -> R.string.toggle_list
                    else -> R.string.toggle_list
                })
            )

            binding.mapLayerToggle.visibility =
                when (displayMode) {
                    UnitsViewModel.UnitsDisplayMode.LIST -> View.GONE
                    UnitsViewModel.UnitsDisplayMode.MAP -> View.VISIBLE
                    else -> View.VISIBLE
                }

            val newFragment =
                when (displayMode) {
                    UnitsViewModel.UnitsDisplayMode.LIST -> devicesFragment
                    UnitsViewModel.UnitsDisplayMode.MAP -> mapFragment
                    else -> mapFragment
                }
            val oldFragment =
                when (displayMode) {
                    UnitsViewModel.UnitsDisplayMode.LIST -> mapFragment
                    UnitsViewModel.UnitsDisplayMode.MAP -> devicesFragment
                    else -> devicesFragment
                }
            supportFragmentManager.commit {
                show(newFragment)
                hide(oldFragment)
            }
        }
        unitsViewModel.selectedUnit.observe(this) {
            unfocusSearch(clearText = true)
        }
    }

    private fun removeObservers() {
        unitsViewModel.units.removeObservers(this)
        unitsViewModel.unitsDisplayMode.removeObservers(this)
        unitsViewModel.selectedUnit.removeObservers(this)
    }

    override fun onBackPressed() {
        if (unitsViewModel.unitsDisplayMode.value == UnitsViewModel.UnitsDisplayMode.LIST) {
            unitsViewModel.setDisplayMode(UnitsViewModel.UnitsDisplayMode.MAP)
        } else {
            super.onBackPressed()
        }
    }
}