session-android/app/src/main/java/org/thoughtcrime/securesms/contacts/ContactSelectionListFragment.kt

package org.thoughtcrime.securesms.contacts

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.loader.app.LoaderManager
import androidx.loader.content.Loader
import androidx.recyclerview.widget.LinearLayoutManager
import network.loki.messenger.databinding.ContactSelectionListFragmentBinding
import org.session.libsession.utilities.recipients.Recipient
import org.session.libsignal.utilities.Log
import org.thoughtcrime.securesms.mms.GlideApp

class ContactSelectionListFragment : Fragment(), LoaderManager.LoaderCallbacks<List<ContactSelectionListItem>>, ContactClickListener {
    private lateinit var binding: ContactSelectionListFragmentBinding
    private var cursorFilter: String? = null
    var onContactSelectedListener: OnContactSelectedListener? = null

    val selectedContacts: List<String>
        get() = listAdapter.selectedContacts.map { it.address.serialize() }

    private val multiSelect: Boolean by lazy {
        requireActivity().intent.getBooleanExtra(MULTI_SELECT, false)
    }

    private val listAdapter by lazy {
        val result = ContactSelectionListAdapter(requireActivity(), multiSelect)
        result.glide = GlideApp.with(this)
        result.contactClickListener = this
        result
    }

    companion object {
        @JvmField val DISPLAY_MODE = "display_mode"
        @JvmField val MULTI_SELECT = "multi_select"
        @JvmField val REFRESHABLE = "refreshable"
    }

    interface OnContactSelectedListener {
        fun onContactSelected(number: String?)
        fun onContactDeselected(number: String?)
    }

    override fun onStart() {
        super.onStart()
        LoaderManager.getInstance(this).initLoader(0, null, this)
    }

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

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding.recyclerView.layoutManager = LinearLayoutManager(activity)
        binding.recyclerView.adapter = listAdapter
    }

    override fun onStop() {
        super.onStop()
        LoaderManager.getInstance(this).destroyLoader(0)
    }

    fun setQueryFilter(filter: String?) {
        cursorFilter = filter
        LoaderManager.getInstance(this).restartLoader(0, null, this)
    }

    fun resetQueryFilter() {
        setQueryFilter(null)
    }

    override fun onCreateLoader(id: Int, args: Bundle?): Loader<List<ContactSelectionListItem>> {
        return ContactSelectionListLoader(requireActivity(),
            requireActivity().intent.getIntExtra(DISPLAY_MODE, ContactsCursorLoader.DisplayMode.FLAG_ALL),
            cursorFilter)
    }

    override fun onLoadFinished(loader: Loader<List<ContactSelectionListItem>>, items: List<ContactSelectionListItem>) {
        update(items)
    }

    override fun onLoaderReset(loader: Loader<List<ContactSelectionListItem>>) {
        update(listOf())
    }

    private fun update(items: List<ContactSelectionListItem>) {
        if (activity?.isDestroyed == true) {
            Log.e(ContactSelectionListFragment::class.java.name,
                    "Received a loader callback after the fragment was detached from the activity.",
                    IllegalStateException())
            return
        }
        listAdapter.items = items
        binding.recyclerView.visibility = if (items.isEmpty()) View.GONE else View.VISIBLE
        binding.emptyStateContainer.visibility = if (items.isEmpty()) View.VISIBLE else View.GONE
    }

    override fun onContactClick(contact: Recipient) {
        listAdapter.onContactClick(contact)
    }

    override fun onContactSelected(contact: Recipient) {
        onContactSelectedListener?.onContactSelected(contact.address.serialize())
    }

    override fun onContactDeselected(contact: Recipient) {
        onContactSelectedListener?.onContactDeselected(contact.address.serialize())
    }
}