/*
 *     Pupil, Hitomi.la viewer for Android
 *     Copyright (C) 2019  tom5079
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU 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 General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package xyz.quaver.pupil.ui

import android.app.Activity
import android.content.Intent
import android.graphics.drawable.Animatable
import android.net.Uri
import android.os.Bundle
import android.text.*
import android.text.style.AlignmentSpan
import android.view.KeyEvent
import android.view.MotionEvent
import android.view.View
import android.view.WindowManager
import android.view.inputmethod.EditorInfo
import android.widget.EditText
import android.widget.ImageView
import android.widget.LinearLayout
import android.widget.TextView
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity
import androidx.cardview.widget.CardView
import androidx.core.content.ContextCompat
import androidx.core.content.res.ResourcesCompat
import androidx.core.view.GravityCompat
import androidx.preference.PreferenceManager
import androidx.vectordrawable.graphics.drawable.AnimatedVectorDrawableCompat
import com.arlib.floatingsearchview.FloatingSearchView
import com.arlib.floatingsearchview.suggestions.model.SearchSuggestion
import com.arlib.floatingsearchview.util.view.SearchInputView
import com.crashlytics.android.Crashlytics
import com.google.android.material.appbar.AppBarLayout
import io.fabric.sdk.android.Fabric
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.activity_main_content.*
import kotlinx.coroutines.*
import kotlinx.serialization.list
import xyz.quaver.hitomi.GalleryBlock
import xyz.quaver.hitomi.doSearch
import xyz.quaver.hitomi.getGalleryIDsFromNozomi
import xyz.quaver.hitomi.getSuggestionsForQuery
import xyz.quaver.pupil.Pupil
import xyz.quaver.pupil.R
import xyz.quaver.pupil.adapters.GalleryBlockAdapter
import xyz.quaver.pupil.types.Tag
import xyz.quaver.pupil.types.TagSuggestion
import xyz.quaver.pupil.types.Tags
import xyz.quaver.pupil.ui.dialog.GalleryDialog
import xyz.quaver.pupil.util.*
import xyz.quaver.pupil.util.download.Cache
import xyz.quaver.pupil.util.download.DownloadWorker
import java.io.File
import java.util.*
import kotlin.collections.ArrayList
import kotlin.math.abs
import kotlin.math.ceil
import kotlin.math.min
import kotlin.math.roundToInt

class MainActivity : AppCompatActivity() {

    enum class Mode {
        SEARCH,
        HISTORY,
        DOWNLOAD,
        FAVORITE
    }
    
    enum class SortMode {
        NEWEST,
        POPULAR
    }

    private val galleries = ArrayList<GalleryBlock>()

    private var query = ""
    set(value) {
        field = value
        with(findViewById<SearchInputView>(R.id.search_bar_text)) {
            if (text.toString() != value)
                setText(query, TextView.BufferType.EDITABLE)
        }
    }

    private var mode = Mode.SEARCH
    private var sortMode = SortMode.NEWEST

    private val REQUEST_SETTINGS = 45162
    private val REQUEST_LOCK = 561

    private var galleryIDs: Deferred<List<Int>>? = null
    private var totalItems = 0
    private var loadingJob: Job? = null
    private var currentPage = 0

    private lateinit var histories: Histories
    private lateinit var favorites: Histories

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

        val lockManager = try {
            LockManager(this)
        } catch (e: Exception) {
            android.app.AlertDialog.Builder(this).apply {
                setTitle(R.string.warning)
                setMessage(R.string.lock_corrupted)
                setPositiveButton(android.R.string.ok) { _, _ ->
                    finish()
                }
            }.show()

            return
        }

        if (lockManager.isNotEmpty())
            startActivityForResult(Intent(this, LockActivity::class.java), REQUEST_LOCK)

        val preference = PreferenceManager.getDefaultSharedPreferences(this)

        if (Locale.getDefault().language == "ko") {
            if (!preference.getBoolean("https_block_alert", false)) {
                android.app.AlertDialog.Builder(this).apply {
                    setTitle(R.string.https_block_alert_title)
                    setMessage(R.string.https_block_alert)
                    setPositiveButton(android.R.string.ok) { _, _ -> }
                }.show()

                preference.edit().putBoolean("https_block_alert", true).apply()
            }
        }

        with(application as Pupil) {
            this@MainActivity.histories = histories
            this@MainActivity.favorites = favorites
        }

        setContentView(R.layout.activity_main)

        checkUpdate(this)

        initView()
    }

    override fun onBackPressed() {
        when {
            main_drawer_layout.isDrawerOpen(GravityCompat.START) -> main_drawer_layout.closeDrawer(GravityCompat.START)
            query.isNotEmpty() -> runOnUiThread {
                query = ""

                cancelFetch()
                clearGalleries()
                fetchGalleries(query, sortMode)
                loadBlocks()
            }
            else -> super.onBackPressed()
        }
    }

    override fun onDestroy() {
        super.onDestroy()

        (main_recyclerview?.adapter as? GalleryBlockAdapter)?.timer?.cancel()
    }

    override fun onResume() {
        val preferences = PreferenceManager.getDefaultSharedPreferences(this)

        if (preferences.getBoolean("security_mode", false))
            window.setFlags(
                WindowManager.LayoutParams.FLAG_SECURE,
                WindowManager.LayoutParams.FLAG_SECURE)
        else
            window.clearFlags(WindowManager.LayoutParams.FLAG_SECURE)

        super.onResume()
    }

    override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
        val preference = PreferenceManager.getDefaultSharedPreferences(this)
        val perPage = preference.getString("per_page", "25")!!.toInt()
        val maxPage = ceil(totalItems / perPage.toDouble()).roundToInt()

        return when(keyCode) {
            KeyEvent.KEYCODE_VOLUME_UP -> {
                if (currentPage > 0) {
                    runOnUiThread {
                        currentPage--

                        cancelFetch()
                        clearGalleries()
                        fetchGalleries(query, sortMode)
                        loadBlocks()
                    }
                }

                true
            }
            KeyEvent.KEYCODE_VOLUME_DOWN -> {
                if (currentPage < maxPage) {
                    runOnUiThread {
                        currentPage++

                        cancelFetch()
                        clearGalleries()
                        fetchGalleries(query, sortMode)
                        loadBlocks()
                    }
                }

                true
            }
            else -> super.onKeyDown(keyCode, event)
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        when(requestCode) {
            REQUEST_SETTINGS -> {
                runOnUiThread {
                    cancelFetch()
                    clearGalleries()
                    fetchGalleries(query, sortMode)
                    loadBlocks()
                }
            }
            REQUEST_LOCK -> {
                if (resultCode != Activity.RESULT_OK)
                    finish()
            }
        }
    }

    private fun initView() {
        var prevP1 = 0
        main_appbar_layout.addOnOffsetChangedListener(
            AppBarLayout.OnOffsetChangedListener { _, p1 ->
                main_searchview.translationY = p1.toFloat()
                main_recyclerview.scrollBy(0, prevP1 - p1)

                with(main_fab) {
                    if (prevP1 > p1)
                        hideMenuButton(true)
                    else if (prevP1 < p1)
                        showMenuButton(true)
                }

                prevP1 = p1
            }
        )

        //NavigationView
        main_nav_view.setNavigationItemSelectedListener {
            runOnUiThread {
                main_drawer_layout.closeDrawers()

                when(it.itemId) {
                    R.id.main_drawer_home -> {
                        cancelFetch()
                        clearGalleries()
                        currentPage = 0
                        query = ""
                        mode = Mode.SEARCH
                        fetchGalleries(query, sortMode)
                        loadBlocks()
                    }
                    R.id.main_drawer_history -> {
                        cancelFetch()
                        clearGalleries()
                        currentPage = 0
                        query = ""
                        mode = Mode.HISTORY
                        fetchGalleries(query, sortMode)
                        loadBlocks()
                    }
                    R.id.main_drawer_downloads -> {
                        cancelFetch()
                        clearGalleries()
                        currentPage = 0
                        query = ""
                        mode = Mode.DOWNLOAD
                        fetchGalleries(query, sortMode)
                        loadBlocks()
                    }
                    R.id.main_drawer_favorite -> {
                        cancelFetch()
                        clearGalleries()
                        currentPage = 0
                        query = ""
                        mode = Mode.FAVORITE
                        fetchGalleries(query, sortMode)
                        loadBlocks()
                    }
                    R.id.main_drawer_help -> {
                        startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.help))))
                    }
                    R.id.main_drawer_github -> {
                        startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.github))))
                    }
                    R.id.main_drawer_homepage -> {
                        startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.home_page))))
                    }
                    R.id.main_drawer_email -> {
                        startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.email))))
                    }
                    R.id.main_drawer_kakaotalk -> {
                        startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.discord))))
                    }
                }
            }

            true
        }

        with(main_fab_jump) {
            setImageResource(R.drawable.ic_jump)
            setOnClickListener {
                val preference = PreferenceManager.getDefaultSharedPreferences(context)
                val perPage = preference.getString("per_page", "25")!!.toInt()
                val editText = EditText(context)

                AlertDialog.Builder(context).apply {
                    setView(editText)
                    setTitle(R.string.main_jump_title)
                    setMessage(getString(
                        R.string.main_jump_message,
                        currentPage+1,
                        ceil(totalItems / perPage.toDouble()).roundToInt()
                    ))

                    setPositiveButton(android.R.string.ok) { _, _ ->
                        currentPage = (editText.text.toString().toIntOrNull() ?: return@setPositiveButton)-1

                        runOnUiThread {
                            cancelFetch()
                            clearGalleries()
                            loadBlocks()
                        }
                    }
                }.show()
            }
        }

        with(main_fab_id) {
            setImageResource(R.drawable.numeric)
            setOnClickListener {
                val editText = EditText(context)

                AlertDialog.Builder(context).apply {
                    setView(editText)
                    setTitle(R.string.main_open_gallery_by_id)

                    setPositiveButton(android.R.string.ok) { _, _ ->
                            val galleryID = editText.text.toString().toInt()
                            val intent = Intent(this@MainActivity, ReaderActivity::class.java).apply {
                                putExtra("galleryID", galleryID)
                            }

                            startActivity(intent)

                            histories.add(galleryID)
                    }
                }.show()
            }
        }

        setupSearchBar()
        setupRecyclerView()
        fetchGalleries(query, sortMode)
        loadBlocks()
    }

    private fun setupRecyclerView() {
        with(main_recyclerview) {
            adapter = GalleryBlockAdapter(this@MainActivity, galleries).apply {
                onChipClickedHandler.add {
                    runOnUiThread {
                        query = it.toQuery()
                        currentPage = 0

                        cancelFetch()
                        clearGalleries()
                        fetchGalleries(query, sortMode)
                        loadBlocks()
                    }
                }
                onDownloadClickedHandler = { position ->
                    val galleryID = galleries[position].id

                    if (!completeFlag.get(galleryID, false)) {
                        val worker = DownloadWorker.getInstance(context)

                        if (worker.progress.indexOfKey(galleryID) >= 0)     //download in progress
                            worker.cancel(galleryID)
                        else {
                            Cache(context).setDownloading(galleryID, true)

                            if (!worker.queue.contains(galleryID))
                                worker.queue.add(galleryID)
                        }
                    }

                    closeAllItems()
                }

                onDeleteClickedHandler = { position ->
                    val galleryID = galleries[position].id

                    CoroutineScope(Dispatchers.Default).launch {
                        DownloadWorker.getInstance(context).cancel(galleryID)

                        Cache(context).getCachedGallery(galleryID).deleteRecursively()

                        histories.remove(galleryID)

                        if (this@MainActivity.mode != Mode.SEARCH)
                            runOnUiThread {
                                cancelFetch()
                                clearGalleries()
                                fetchGalleries(query, sortMode)
                                loadBlocks()
                            }

                        completeFlag.put(galleryID, false)
                    }

                    closeAllItems()
                }
            }
            ItemClickSupport.addTo(this)
                .setOnItemClickListener { _, position, v ->
                    if (v !is CardView)
                        return@setOnItemClickListener

                    val intent = Intent(this@MainActivity, ReaderActivity::class.java)
                    val gallery = galleries[position]
                    intent.putExtra("galleryID", gallery.id)

                    //TODO: Maybe sprinkling some transitions will be nice :D
                    startActivity(intent)

                    histories.add(gallery.id)
                }.setOnItemLongClickListener { _, position, v ->

                    if (v !is CardView)
                        return@setOnItemLongClickListener true

                    val galleryID = galleries[position].id

                    GalleryDialog(
                        this@MainActivity,
                        galleryID
                    ).apply {
                        onChipClickedHandler.add {
                            runOnUiThread {
                                query = it.toQuery()
                                currentPage = 0

                                cancelFetch()
                                clearGalleries()
                                fetchGalleries(query, sortMode)
                                loadBlocks()
                            }
                            dismiss()
                        }
                    }.show()

                    true
                }

            var origin = 0f
            var target = -1
            val preferences = PreferenceManager.getDefaultSharedPreferences(context)
            val perPage = preferences.getString("per_page", "25")!!.toInt()
            setOnTouchListener { _, event ->
                when(event.action) {
                    MotionEvent.ACTION_UP -> {
                        origin = 0f

                        with(main_recyclerview.adapter as GalleryBlockAdapter) {
                            if(showPrev) {
                                showPrev = false

                                val prev = main_recyclerview.layoutManager?.getChildAt(0)

                                if (prev is LinearLayout) {
                                    val icon = prev.findViewById<ImageView>(R.id.icon_prev)
                                    prev.layoutParams.height = 1
                                    icon.layoutParams.height = 1
                                    icon.rotation = 180f
                                }

                                prev?.requestLayout()

                                notifyItemRemoved(0)
                            }

                            if(showNext) {
                                showNext = false

                                val next = main_recyclerview.layoutManager?.let {
                                    getChildAt(childCount-1)
                                }

                                if (next is LinearLayout) {
                                    val icon = next.findViewById<ImageView>(R.id.icon_next)
                                    next.layoutParams.height = 1
                                    icon.layoutParams.height = 1
                                    icon.rotation = 0f
                                }

                                next?.requestLayout()

                                notifyItemRemoved(itemCount)
                            }
                        }

                        if (target != -1) {
                            currentPage = target

                            runOnUiThread {
                                cancelFetch()
                                clearGalleries()
                                loadBlocks()
                            }

                            target = -1
                        }
                    }
                    MotionEvent.ACTION_DOWN -> origin = event.y
                    MotionEvent.ACTION_MOVE -> {
                        if (origin == 0f)
                            origin = event.y

                        val dist = event.y - origin

                        when {
                            !canScrollVertically(-1) -> {
                                //TOP

                                //Scrolling UP
                                if (dist > 0 && currentPage != 0) {
                                    with(main_recyclerview.adapter as GalleryBlockAdapter) {
                                        if(!showPrev) {
                                            showPrev = true
                                            notifyItemInserted(0)
                                        }
                                    }

                                    val prev = main_recyclerview.layoutManager?.getChildAt(0)

                                    if (prev is LinearLayout) {
                                        val icon = prev.findViewById<ImageView>(R.id.icon_prev)
                                        val text = prev.findViewById<TextView>(R.id.text_prev).apply {
                                            text = getString(R.string.main_move, currentPage)
                                        }
                                        if (dist < 360) {
                                            prev.layoutParams.height = (dist/2).roundToInt()
                                            icon.layoutParams.height = (dist/2).roundToInt()
                                            icon.rotation = dist+180
                                            text.layoutParams.width = dist.roundToInt()

                                            target = -1
                                        }
                                        else {
                                            prev.layoutParams.height = 180
                                            icon.layoutParams.height = 180
                                            icon.rotation = 180f
                                            text.layoutParams.width = LinearLayout.LayoutParams.WRAP_CONTENT

                                            target = currentPage-1
                                        }
                                    }

                                    prev?.requestLayout()

                                    return@setOnTouchListener true
                                } else {
                                    with(main_recyclerview.adapter as GalleryBlockAdapter) {
                                        if(showPrev) {
                                            showPrev = false

                                            val prev = main_recyclerview.layoutManager?.getChildAt(0)

                                            if (prev is LinearLayout) {
                                                val icon = prev.findViewById<ImageView>(R.id.icon_prev)
                                                prev.layoutParams.height = 1
                                                icon.layoutParams.height = 1
                                                icon.rotation = 180f
                                            }

                                            prev?.requestLayout()

                                            notifyItemRemoved(0)
                                        }
                                    }
                                }
                            }
                            !canScrollVertically(1) -> {
                                //BOTTOM

                                //Scrolling DOWN
                                if (dist < 0 && currentPage != ceil(totalItems.toDouble()/perPage).roundToInt()-1) {
                                    with(main_recyclerview.adapter as GalleryBlockAdapter) {
                                        if(!showNext) {
                                            showNext = true
                                            notifyItemInserted(itemCount-1)
                                        }
                                    }

                                    val next = main_recyclerview.layoutManager?.let {
                                        getChildAt(childCount-1)
                                    }

                                    val absDist = abs(dist)

                                    if (next is LinearLayout) {
                                        val icon = next.findViewById<ImageView>(R.id.icon_next)
                                        val text = next.findViewById<TextView>(R.id.text_next).apply {
                                            text = getString(R.string.main_move, currentPage+2)
                                        }

                                        if (absDist < 360) {
                                            next.layoutParams.height = (absDist/2).roundToInt()
                                            icon.layoutParams.height = (absDist/2).roundToInt()
                                            icon.rotation = -absDist
                                            text.layoutParams.width = absDist.roundToInt()

                                            target = -1
                                        } else {
                                            next.layoutParams.height = 180
                                            icon.layoutParams.height = 180
                                            icon.rotation = 0f
                                            text.layoutParams.width = LinearLayout.LayoutParams.WRAP_CONTENT

                                            target = currentPage+1
                                        }
                                    }

                                    next?.requestLayout()

                                    return@setOnTouchListener true
                                } else {
                                    with(main_recyclerview.adapter as GalleryBlockAdapter) {
                                        if(showNext) {
                                            showNext = false

                                            val next = main_recyclerview.layoutManager?.let {
                                                getChildAt(childCount-1)
                                            }

                                            if (next is LinearLayout) {
                                                val icon = next.findViewById<ImageView>(R.id.icon_next)
                                                next.layoutParams.height = 1
                                                icon.layoutParams.height = 1
                                                icon.rotation = 180f
                                            }

                                            next?.requestLayout()

                                            notifyItemRemoved(itemCount)
                                        }
                                    }
                                }
                            }
                        }
                    }
                }

                false
            }
        }
    }

    private var suggestionJob : Job? = null
    private fun setupSearchBar() {
        val searchInputView = findViewById<SearchInputView>(R.id.search_bar_text)
        //Change upper case letters to lower case
        searchInputView.addTextChangedListener(object: TextWatcher {
            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {

            }

            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {

            }

            override fun afterTextChanged(s: Editable?) {
                s ?: return

                if (s.any { it.isUpperCase() })
                    s.replace(0, s.length, s.toString().toLowerCase(Locale.getDefault()))
            }
        })
        searchInputView.imeOptions = EditorInfo.IME_FLAG_NO_EXTRACT_UI

        with(main_searchview as FloatingSearchView) {
            val favoritesFile = File(ContextCompat.getDataDir(context), "favorites_tags.json")
            val serializer = Tag.serializer().list

            if (!favoritesFile.exists()) {
                favoritesFile.createNewFile()
                favoritesFile.writeText(json.stringify(serializer, Tags(listOf())))
            }

            setOnMenuItemClickListener {
                when(it.itemId) {
                    R.id.main_menu_settings -> startActivityForResult(Intent(this@MainActivity, SettingsActivity::class.java), REQUEST_SETTINGS)
                    R.id.main_menu_sort_newest -> {
                        sortMode = SortMode.NEWEST
                        it.isChecked = true

                        runOnUiThread {
                            currentPage = 0

                            cancelFetch()
                            clearGalleries()
                            fetchGalleries(query, sortMode)
                            loadBlocks()
                        }
                    }
                    R.id.main_menu_sort_popular -> {
                        sortMode = SortMode.POPULAR
                        it.isChecked = true

                        runOnUiThread {
                            currentPage = 0

                            cancelFetch()
                            clearGalleries()
                            fetchGalleries(query, sortMode)
                            loadBlocks()
                        }
                    }
                }
            }

            setOnQueryChangeListener { _, query ->
                this@MainActivity.query = query

                suggestionJob?.cancel()

                clearSuggestions()

                if (query.isEmpty() or query.endsWith(' ')) {
                    swapSuggestions(json.parse(serializer, favoritesFile.readText()).map {
                        TagSuggestion(it.tag, -1, "", it.area ?: "tag")
                    })

                    return@setOnQueryChangeListener
                }

                val currentQuery = query.split(" ").last().replace('_', ' ')

                suggestionJob = CoroutineScope(Dispatchers.IO).launch {
                    val suggestions = ArrayList(getSuggestionsForQuery(currentQuery).map { TagSuggestion(it) })

                    suggestions.filter {
                        val tag = "${it.n}:${it.s.replace(Regex("\\s"), "_")}"
                        Tags(json.parse(serializer, favoritesFile.readText())).contains(tag)
                    }.reversed().forEach {
                        suggestions.remove(it)
                        suggestions.add(0, it)
                    }

                    withContext(Dispatchers.Main) {
                        swapSuggestions(suggestions)
                    }
                }
            }

            setOnBindSuggestionCallback { suggestionView, leftIcon, textView, item, _ ->
                item as TagSuggestion

                val tag = "${item.n}:${item.s.replace(Regex("\\s"), "_")}"

                leftIcon.setImageDrawable(
                    ResourcesCompat.getDrawable(
                        resources,
                        when(item.n) {
                            "female" -> R.drawable.ic_gender_female
                            "male" -> R.drawable.ic_gender_male
                            "language" -> R.drawable.ic_translate
                            "group" -> R.drawable.ic_account_group
                            "character" -> R.drawable.ic_account_star
                            "series" -> R.drawable.ic_book_open
                            "artist" -> R.drawable.ic_brush
                            else -> R.drawable.ic_tag
                        },
                        null)
                )

                with(suggestionView.findViewById<ImageView>(R.id.right_icon)) {

                    if (Tags(json.parse(serializer, favoritesFile.readText())).contains(tag))
                        setImageResource(R.drawable.ic_star_filled)
                    else
                        setImageResource(R.drawable.ic_star_empty)

                    visibility = View.VISIBLE
                    rotation = 0f
                    isEnabled = true

                    isClickable = true
                    setOnClickListener {
                        val favorites = Tags(json.parse(serializer, favoritesFile.readText()))

                        if (favorites.contains(tag)) {
                            setImageResource(R.drawable.ic_star_empty)
                            favorites.remove(tag)
                        }
                        else {
                            setImageDrawable(AnimatedVectorDrawableCompat.create(context,
                                R.drawable.avd_star
                            ))
                            (drawable as Animatable).start()

                            favorites.add(tag)
                        }

                        favoritesFile.writeText(json.stringify(serializer, favorites))
                    }
                }

                if (item.t == -1) {
                    textView.text = item.s
                } else {
                    val text = "${item.s}\n ${item.t}"

                    val len = text.length
                    val left = item.s.length

                    textView.text = SpannableString(text).apply {
                        val s = AlignmentSpan.Standard(Layout.Alignment.ALIGN_OPPOSITE)
                        setSpan(s, left, len, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
                        setSpan(SetLineOverlap(true), 1, len-2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
                        setSpan(SetLineOverlap(false), len-1, len, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
                    }
                }
            }

            setOnSearchListener(object : FloatingSearchView.OnSearchListener {
                override fun onSuggestionClicked(searchSuggestion: SearchSuggestion?) {
                    if (searchSuggestion !is TagSuggestion)
                        return

                    with(searchInputView.text) {
                        delete(if (lastIndexOf(' ') == -1) 0 else lastIndexOf(' ')+1, length)
                        append("${searchSuggestion.n}:${searchSuggestion.s.replace(Regex("\\s"), "_")} ")
                    }
                }

                override fun onSearchAction(currentQuery: String?) {
                    //Do search on onFocusCleared()
                }
            })

            setOnFocusChangeListener(object: FloatingSearchView.OnFocusChangeListener {
                override fun onFocus() {
                    if (query.isEmpty() or query.endsWith(' '))
                        swapSuggestions(json.parse(serializer, favoritesFile.readText()).map {
                            TagSuggestion(it.tag, -1, "", it.area ?: "tag")
                        })
                }

                override fun onFocusCleared() {
                    suggestionJob?.cancel()

                    runOnUiThread {
                        cancelFetch()
                        clearGalleries()
                        currentPage = 0
                        fetchGalleries(query, sortMode)
                        loadBlocks()
                    }
                }
            })

            attachNavigationDrawerToMenuButton(main_drawer_layout)
        }
    }

    private fun cancelFetch() {
        galleryIDs?.cancel()
        loadingJob?.cancel()
    }

    private fun clearGalleries() {
        galleries.clear()

        with(main_recyclerview.adapter as GalleryBlockAdapter?) {
            this ?: return@with

            this.completeFlag.clear()
            this.notifyDataSetChanged()
        }

        main_appbar_layout.setExpanded(true)
        main_noresult.visibility = View.INVISIBLE
        main_progressbar.show()
    }

    private fun fetchGalleries(query: String, sortMode: SortMode) {
        val preference = PreferenceManager.getDefaultSharedPreferences(this)
        val defaultQuery = preference.getString("default_query", "")!!

        galleryIDs = null

        if (galleryIDs?.isActive == true)
            return

        galleryIDs = CoroutineScope(Dispatchers.IO).async {
            when(mode) {
                Mode.SEARCH -> {
                    when {
                        query.isEmpty() and defaultQuery.isEmpty() -> {
                            when(sortMode) {
                                SortMode.POPULAR -> getGalleryIDsFromNozomi(null, "popular", "all")
                                else -> getGalleryIDsFromNozomi(null, "index", "all")
                            }.also {
                                totalItems = it.size
                            }
                        }
                        else -> doSearch("$defaultQuery $query", sortMode == SortMode.POPULAR).also {
                            totalItems = it.size
                        }
                    }
                }
                Mode.HISTORY -> {
                    when {
                        query.isEmpty() -> {
                            histories.toList().also {
                                totalItems = it.size
                            }
                        }
                        else -> {
                            val result = doSearch(query).sorted()
                            histories.filter { result.binarySearch(it) >= 0 }.also {
                                totalItems = it.size
                            }
                        }
                    }
                }
                Mode.DOWNLOAD -> {
                    val downloads = getDownloadDirectory(this@MainActivity).listFiles()?.filter { file ->
                        file.isDirectory && (file.name.toIntOrNull() != null) && File(file, ".metadata").exists()
                    }?.map {
                        it.name.toInt()
                    } ?: emptyList()

                    when {
                        query.isEmpty() -> downloads.also {
                            totalItems = it.size
                        }
                        else -> {
                            val result = doSearch(query).sorted()
                            downloads.filter { result.binarySearch(it) >= 0 }.also {
                                totalItems = it.size
                            }
                        }
                    }
                }
                Mode.FAVORITE -> {
                    when {
                        query.isEmpty() -> favorites.toList().also {
                            totalItems = it.size
                        }
                        else -> {
                            val result = doSearch(query).sorted()
                            favorites.filter { result.binarySearch(it) >= 0 }.also {
                                totalItems = it.size
                            }
                        }
                    }
                }
            }
        }
    }

    private fun loadBlocks() {
        val preference = PreferenceManager.getDefaultSharedPreferences(this)
        val perPage = preference.getString("per_page", "25")?.toInt() ?: 25

        loadingJob = CoroutineScope(Dispatchers.IO).launch {
            val galleryIDs = try {
                galleryIDs!!.await().also {
                    if (it.isEmpty())
                        throw Exception("No result")
                }
            } catch (e: Exception) {

                if (Fabric.isInitialized() && e.message != "No result")
                    Crashlytics.logException(e)

                withContext(Dispatchers.Main) {
                    main_noresult.visibility = View.VISIBLE
                    main_progressbar.hide()
                }

                return@launch
            }

            galleryIDs.slice(currentPage*perPage until min(currentPage*perPage+perPage, galleryIDs.size)).chunked(5).let { chunks ->
                for (chunk in chunks)
                    chunk.map { galleryID ->
                        async {
                            Cache(this@MainActivity).getGalleryBlock(galleryID)
                        }
                    }.forEach {
                        val galleryBlock = it.await()

                        withContext(Dispatchers.Main) {
                            main_progressbar.hide()

                            if (galleryBlock != null) {
                                galleries.add(galleryBlock)
                                main_recyclerview.adapter!!.notifyItemInserted(galleries.size - 1)
                            }
                        }
                    }
            }
        }
    }
}