PixelDroid-App-Android/app/src/main/java/com/h/pixeldroid/searchDiscover/SearchDiscoverFragment.kt

package com.h.pixeldroid.searchDiscover

import android.app.SearchManager
import android.content.Context
import android.content.Intent
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.annotation.StringRes
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.h.pixeldroid.R
import com.h.pixeldroid.databinding.FragmentSearchBinding
import com.h.pixeldroid.profile.ProfilePostViewHolder
import com.h.pixeldroid.utils.api.PixelfedAPI
import com.h.pixeldroid.utils.api.objects.Status
import com.h.pixeldroid.posts.PostActivity
import com.h.pixeldroid.utils.BaseFragment
import com.h.pixeldroid.utils.ImageConverter
import com.h.pixeldroid.utils.bindingLifecycleAware
import retrofit2.HttpException
import java.io.IOException

/**
 * This fragment lets you search and use Pixelfed's Discover feature
 */

class SearchDiscoverFragment : BaseFragment() {
    private lateinit var api: PixelfedAPI
    private lateinit var recycler : RecyclerView
    private lateinit var adapter : DiscoverRecyclerViewAdapter

    var binding: FragmentSearchBinding by bindingLifecycleAware()

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

        // Configure the search widget (see https://developer.android.com/guide/topics/search/search-dialog#ConfiguringWidget)
        val searchManager = requireActivity().getSystemService(Context.SEARCH_SERVICE) as SearchManager
        binding.search.apply {
            setSearchableInfo(searchManager.getSearchableInfo(requireActivity().componentName))
            isSubmitButtonEnabled = true
        }

        // Set posts RecyclerView as a grid with 3 columns
        recycler = binding.discoverList
        recycler.layoutManager = GridLayoutManager(requireContext(), 3)
        adapter = DiscoverRecyclerViewAdapter()
        recycler.adapter = adapter

        return binding.root
    }

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

        api = apiHolder.api ?: apiHolder.setToCurrentUser()

        getDiscover()

        binding.discoverRefreshLayout.setOnRefreshListener {
            getDiscover()
        }
    }

    fun showError(@StringRes errorText: Int = R.string.loading_toast, show: Boolean = true){
        binding.motionLayout.apply {
            if(show){
                transitionToEnd()
            } else {
                transitionToStart()
            }
        }
        binding.discoverRefreshLayout.isRefreshing = false
        binding.discoverProgressBar.visibility = View.GONE
    }


    private fun getDiscover() {
        lifecycleScope.launchWhenCreated {
            try {
                val discoverPosts = api.discover()
                adapter.addPosts(discoverPosts.posts)
                showError(show = false)
            } catch (exception: IOException) {
                showError()
            } catch (exception: HttpException) {
                showError()
            }
        }
    }

    /**
     * [RecyclerView.Adapter] that can display a list of [Status]s' thumbnails for the discover view
     */
    class DiscoverRecyclerViewAdapter: RecyclerView.Adapter<ProfilePostViewHolder>() {
        private val posts: ArrayList<Status> = ArrayList()

        fun addPosts(newPosts : List<Status>) {
            posts.clear()
            posts.addAll(newPosts)
            notifyDataSetChanged()
        }

        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ProfilePostViewHolder {
            val view = LayoutInflater.from(parent.context)
                .inflate(R.layout.fragment_profile_posts, parent, false)
            return ProfilePostViewHolder(view)
        }

        override fun onBindViewHolder(holder: ProfilePostViewHolder, position: Int) {
            val post = posts[position]
            if(post.media_attachments?.size ?: 0 > 1) {
                holder.albumIcon.visibility = View.VISIBLE
            } else {
                holder.albumIcon.visibility = View.GONE
            }
            ImageConverter.setSquareImageFromURL(holder.postView, post.media_attachments?.firstOrNull()?.preview_url, holder.postPreview, post.media_attachments?.firstOrNull()?.blurhash)
            holder.postPreview.setOnClickListener {
                val intent = Intent(holder.postView.context, PostActivity::class.java)
                intent.putExtra(Status.POST_TAG, post)
                holder.postView.context.startActivity(intent)
            }
        }

        override fun getItemCount(): Int = posts.size
    }
}