package com.github.libretube

import android.content.Context
import android.content.DialogInterface
import android.os.Bundle
import android.text.Editable
import android.text.TextWatcher
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.view.WindowManager
import android.view.inputmethod.EditorInfo
import android.view.inputmethod.InputMethodManager
import android.widget.*
import android.widget.TextView.*
import androidx.appcompat.app.AlertDialog
import androidx.fragment.app.Fragment
import androidx.lifecycle.lifecycleScope
import androidx.preference.PreferenceManager
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.github.libretube.adapters.SearchAdapter
import com.github.libretube.adapters.SearchHistoryAdapter
import java.io.IOException
import com.google.android.material.dialog.MaterialAlertDialogBuilder
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import retrofit2.HttpException

class SearchFragment : Fragment() {
    private val TAG = "SearchFragment"
    private var selectedFilter = 0
    private var apiSearchFilter = "all"
    private var nextPage: String? = null
    private lateinit var searchRecView: RecyclerView
    private var searchAdapter: SearchAdapter? = null
    private var isLoading: Boolean = true

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

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_search, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        searchRecView = view.findViewById<RecyclerView>(R.id.search_recycler)

        val autoTextView = view.findViewById<AutoCompleteTextView>(R.id.autoCompleteTextView)

        val historyRecycler = view.findViewById<RecyclerView>(R.id.history_recycler)

        val filterImageView = view.findViewById<ImageView>(R.id.filterMenu_imageView)

        var tempSelectedItem = 0

        filterImageView.setOnClickListener {
            val filterOptions = arrayOf(
                getString(R.string.all),
                getString(R.string.videos),
                getString(R.string.channels),
                getString(R.string.playlists),
                getString(R.string.music_songs),
                getString(R.string.music_videos),
                getString(R.string.music_albums),
                getString(R.string.music_playlists)
            )

            MaterialAlertDialogBuilder(view.context)
                .setTitle(getString(R.string.choose_filter))
                .setSingleChoiceItems(
                    filterOptions, selectedFilter,
                    DialogInterface.OnClickListener {
                            _, id ->
                        tempSelectedItem = id
                    }
                )
                .setPositiveButton(
                    getString(R.string.okay),
                    DialogInterface.OnClickListener { _, _ ->
                        selectedFilter = tempSelectedItem
                        apiSearchFilter = when (selectedFilter) {
                            0 -> "all"
                            1 -> "videos"
                            2 -> "channels"
                            3 -> "playlists"
                            4 -> "music_songs"
                            5 -> "music_videos"
                            6 -> "music_albums"
                            7 -> "music_playlists"
                            else -> "all"
                        }
                        fetchSearch(autoTextView.text.toString())
                    }
                )
                .setNegativeButton(getString(R.string.cancel), null)
                .create()
                .show()
        }

        // show search history

        searchRecView.visibility = GONE
        historyRecycler.visibility = VISIBLE

        historyRecycler.layoutManager = LinearLayoutManager(view.context)

        var historylist = getHistory()
        if (historylist.isNotEmpty()) {
            historyRecycler.adapter =
                SearchHistoryAdapter(requireContext(), historylist, autoTextView)
        }

        searchRecView.layoutManager = GridLayoutManager(view.context, 1)
        autoTextView.requestFocus()
        val imm =
            requireContext().getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
        imm.showSoftInput(autoTextView, InputMethodManager.SHOW_IMPLICIT)
        autoTextView.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) {
                if (s!! != "") {
                    searchRecView.visibility = VISIBLE
                    historyRecycler.visibility = GONE
                    searchRecView.adapter = null

                    searchRecView.viewTreeObserver
                        .addOnScrollChangedListener {
                            if (!searchRecView.canScrollVertically(1)) {
                                fetchNextSearchItems(autoTextView.text.toString())
                            }
                        }

                    GlobalScope.launch {
                        fetchSuggestions(s.toString(), autoTextView)
                        delay(1000)
                        val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(requireContext())
                        if (sharedPreferences.getBoolean("search_history_toggle", true)) addtohistory(s.toString())
                        fetchSearch(s.toString())
                    }
                }
            }

            override fun afterTextChanged(s: Editable?) {
                if (s!!.isEmpty()) {
                    searchRecView.visibility = GONE
                    historyRecycler.visibility = VISIBLE
                    var historylist = getHistory()
                    if (historylist.isNotEmpty()) {
                        historyRecycler.adapter =
                            SearchHistoryAdapter(requireContext(), historylist, autoTextView)
                    }
                }
            }
        })
        autoTextView.setOnEditorActionListener(
            OnEditorActionListener { _, actionId, _ ->
                if (actionId == EditorInfo.IME_ACTION_SEARCH) {
                    hideKeyboard()
                    autoTextView.dismissDropDown()
                    return@OnEditorActionListener true
                }
                false
            }
        )
        autoTextView.setOnItemClickListener { _, _, _, _ ->
            hideKeyboard()
        }
    }

    private fun fetchSuggestions(query: String, autoTextView: AutoCompleteTextView) {
        lifecycleScope.launchWhenCreated {
            val response = try {
                RetrofitInstance.api.getSuggestions(query)
            } catch (e: IOException) {
                println(e)
                Log.e(TAG, "IOException, you might not have internet connection")
                return@launchWhenCreated
            } catch (e: HttpException) {
                Log.e(TAG, "HttpException, unexpected response")
                return@launchWhenCreated
            }
            val adapter = ArrayAdapter(requireContext(), android.R.layout.simple_list_item_1, response)
            autoTextView.setAdapter(adapter)
        }
    }
    private fun fetchSearch(query: String) {
        lifecycleScope.launchWhenCreated {
            val response = try {
                RetrofitInstance.api.getSearchResults(query, apiSearchFilter)
            } catch (e: IOException) {
                println(e)
                Log.e(TAG, "IOException, you might not have internet connection $e")
                return@launchWhenCreated
            } catch (e: HttpException) {
                Log.e(TAG, "HttpException, unexpected response")
                return@launchWhenCreated
            }
            nextPage = response.nextpage
            if (response.items!!.isNotEmpty()) {
                runOnUiThread {
                    searchAdapter = SearchAdapter(response.items)
                    searchRecView.adapter = searchAdapter
                }
            }
            isLoading = false
        }
    }

    private fun fetchNextSearchItems(query: String) {
        lifecycleScope.launchWhenCreated {
            if (!isLoading) {
                isLoading = true
                val response = try {
                    RetrofitInstance.api.getSearchResultsNextPage(query, apiSearchFilter, nextPage!!)
                } catch (e: IOException) {
                    println(e)
                    Log.e(TAG, "IOException, you might not have internet connection")
                    return@launchWhenCreated
                } catch (e: HttpException) {
                    Log.e(TAG, "HttpException, unexpected response," + e.response())
                    return@launchWhenCreated
                }
                nextPage = response.nextpage
                searchAdapter?.updateItems(response.items!!)
                isLoading = false
            }
        }
    }

    private fun Fragment?.runOnUiThread(action: () -> Unit) {
        this ?: return
        if (!isAdded) return // Fragment not attached to an Activity
        activity?.runOnUiThread(action)
    }

    override fun onResume() {
        super.onResume()
        requireActivity().window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN)
    }

    override fun onStop() {
        super.onStop()
        hideKeyboard()
    }

    private fun addtohistory(query: String) {
        val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(requireContext())

        var historyList = getHistory()

        if (historyList.size != 0 && query == historyList.get(historyList.size - 1)) {
            return
        } else if (query == "") {
            return
        } else {
            historyList = historyList + query
        }

        if (historyList.size > 10) {
            historyList = historyList.takeLast(10)
        }

        var set: Set<String> = HashSet(historyList)

        sharedPreferences.edit().putStringSet("search_history", set)
            .apply()
    }

    private fun getHistory(): List<String> {
        try {
            val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(requireContext())
            val set: Set<String> = sharedPreferences.getStringSet("search_history", HashSet())!!
            return set.toList()
        } catch (e: Exception) {
            return emptyList()
        }
    }
}