etesync-android/app/src/main/java/com/etesync/syncadapter/ui/etebase/ListEntriesFragment.kt

package com.etesync.syncadapter.ui.etebase

import android.content.Context
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.*
import androidx.fragment.app.ListFragment
import androidx.fragment.app.activityViewModels
import androidx.fragment.app.commit
import com.etesync.syncadapter.CachedCollection
import com.etesync.syncadapter.CachedItem
import com.etesync.syncadapter.Constants
import com.etesync.syncadapter.R
import java.text.SimpleDateFormat
import java.util.concurrent.Future

class ListEntriesFragment : ListFragment(), AdapterView.OnItemClickListener {
    private val collectionModel: CollectionViewModel by activityViewModels()
    private val itemsModel: ItemsViewModel by activityViewModels()
    private var asyncTask: Future<Unit>? = null

    private var emptyTextView: TextView? = null

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val view = inflater.inflate(R.layout.journal_viewer_list, container, false)

        //This is instead of setEmptyText() function because of Google bug
        //See: https://code.google.com/p/android/issues/detail?id=21742
        emptyTextView = view.findViewById<View>(android.R.id.empty) as TextView

        return view
    }

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

        collectionModel.observe(this) { col ->
            itemsModel.observe(this) {
                val entries = it.sortedByDescending { item ->
                    item.meta.mtime ?: 0
                }
                val listAdapter = EntriesListAdapter(requireContext(), col)
                setListAdapter(listAdapter)

                listAdapter.addAll(entries)

                emptyTextView!!.text = getString(R.string.journal_entries_list_empty)
            }
        }

        listView.onItemClickListener = this
    }

    override fun onDestroyView() {
        super.onDestroyView()
        if (asyncTask != null)
            asyncTask!!.cancel(true)
    }

    override fun onItemClick(parent: AdapterView<*>, view: View, position: Int, id: Long) {
        val item = listAdapter?.getItem(position) as CachedItem
        activity?.supportFragmentManager?.commit {
            replace(R.id.fragment_container, CollectionItemFragment(item))
            addToBackStack(EditCollectionFragment::class.java.name)
        }
    }

    internal inner class EntriesListAdapter(context: Context, val cachedCollection: CachedCollection) : ArrayAdapter<CachedItem>(context, R.layout.journal_viewer_list_item) {

        override fun getView(position: Int, _v: View?, parent: ViewGroup): View {
            var v = _v
            if (v == null)
                v = LayoutInflater.from(context).inflate(R.layout.journal_viewer_list_item, parent, false)!!

            val item = getItem(position)

            setItemView(v, cachedCollection.meta.collectionType, item)

            /* FIXME: handle entry error:
            val entryError = data.select(EntryErrorEntity::class.java).where(EntryErrorEntity.ENTRY.eq(entryEntity)).limit(1).get().firstOrNull()
            if (entryError != null) {
                val errorIcon = v.findViewById<View>(R.id.error) as ImageView
                errorIcon.visibility = View.VISIBLE
            }
             */

            return v
        }
    }

    companion object {
        private val dateFormatter = SimpleDateFormat()
        private fun getLine(content: String?, prefix: String): String? {
            var content: String? = content ?: return null

            val start = content!!.indexOf(prefix)
            if (start >= 0) {
                val end = content.indexOf("\n", start)
                content = content.substring(start + prefix.length, end)
            } else {
                content = null
            }
            return content
        }

        fun setItemView(v: View, collectionType: String, item: CachedItem) {

            var tv = v.findViewById<View>(R.id.title) as TextView

            // FIXME: hacky way to make it show sensible info
            val prefix: String = when (collectionType) {
                Constants.ETEBASE_TYPE_CALENDAR, Constants.ETEBASE_TYPE_TASKS -> {
                    "SUMMARY:"
                }
                Constants.ETEBASE_TYPE_ADDRESS_BOOK -> {
                    "FN:"
                }
                else -> {
                    ""
                }
            }

            val fullContent = item.content
            var content = getLine(fullContent, prefix)
            content = content ?: "Not found"
            tv.text = content

            tv = v.findViewById<View>(R.id.description) as TextView
            // FIXME: Don't use a hard-coded string
            content = "Modified: ${dateFormatter.format(item.meta.mtime ?: 0)}"
            tv.text = content

            val action = v.findViewById<View>(R.id.action) as ImageView
            if (item.item.isDeleted) {
                action.setImageResource(R.drawable.action_delete)
            } else {
                action.setImageResource(R.drawable.action_change)
            }
        }
    }
}