package com.grameenphone.chitchatsdk.base

import android.content.Context
import android.graphics.Color
import android.graphics.drawable.ColorDrawable
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.appcompat.app.AlertDialog
import androidx.lifecycle.Observer
import androidx.lifecycle.ViewModelProviders
import com.google.android.material.dialog.MaterialAlertDialogBuilder
import com.grameenphone.chitchatsdk.R
import com.grameenphone.chitchatsdk.utils.ServiceLocator
import java.lang.Math.max
import java.lang.reflect.ParameterizedType

abstract class BaseFragment<vm : BaseViewModel> : Fragment() {

    lateinit var viewModel : vm
    private var loaderRequest = 0

    private val loaderDialog: AlertDialog by lazy {

        val builder = MaterialAlertDialogBuilder(context)
        val dialogView = LayoutInflater.from(context).inflate(R.layout.cc_dialog_loader, activity?.findViewById(android.R.id.content), false)
        builder.setView(dialogView)
        builder.setCancelable(false)
        return@lazy builder.create().apply {
            window?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
        }
    }

    abstract fun setLayout() : Int

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(setLayout(), container, false)
    }

    override fun onAttach(context: Context) {
        super.onAttach(context)

        ServiceLocator.initialize(context.applicationContext)

        viewModel = ViewModelProviders.of(this).get(setViewModel())
    }

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

        viewModel.showLoader.observe(this, Observer {
            if (it) showLoader()
            else hideLoader()
        })

        viewModel.toastMessage.observe(this, Observer {
            showShortToast(it)
        })
    }

    private fun setViewModel() : Class<vm> {

        val type = (javaClass.genericSuperclass as ParameterizedType).actualTypeArguments[0]  // index of 0 means first argument of Base class param

        return type as Class<vm>
    }

    private fun showLoader() {
        activity?.runOnUiThread {
            if (!loaderDialog.isShowing) {
                loaderDialog.show()
                loaderRequest++
            }
        }
    }

    private fun hideLoader() {
        activity?.runOnUiThread {
            loaderRequest = max(0, loaderRequest-1)
            if (loaderDialog.isShowing && loaderRequest==0)
                loaderDialog.dismiss()
        }
    }

    fun showShortToast(message: String) {
        Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
    }

    fun showLongToast(message: String) {
        Toast.makeText(context, message, Toast.LENGTH_LONG).show()
    }

}