package com.github.libretube

import android.Manifest
import android.content.ContentResolver
import android.content.Context
import android.content.Intent
import android.content.SharedPreferences
import android.content.pm.PackageManager
import android.net.Uri
import android.os.Build
import android.os.Bundle
import android.text.TextUtils
import android.util.Log
import android.widget.Toast
import androidx.activity.result.ActivityResultLauncher
import androidx.activity.result.contract.ActivityResultContracts
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.app.AppCompatDelegate
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import androidx.fragment.app.Fragment
import androidx.lifecycle.lifecycleScope
import androidx.preference.ListPreference
import androidx.preference.Preference
import androidx.preference.PreferenceFragmentCompat
import androidx.preference.PreferenceManager
import org.json.JSONObject
import org.json.JSONTokener
import retrofit2.HttpException
import java.io.IOException
import java.io.InputStream
import java.util.zip.ZipEntry
import java.util.zip.ZipInputStream

class SettingsActivity : AppCompatActivity(),
    SharedPreferences.OnSharedPreferenceChangeListener{

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_settings)
        if (savedInstanceState == null) {
            supportFragmentManager
                .beginTransaction()
                .replace(R.id.settings, SettingsFragment())
                .commit()
        }
        supportActionBar?.setDisplayHomeAsUpEnabled(true)

        PreferenceManager.getDefaultSharedPreferences(this)
            .registerOnSharedPreferenceChangeListener(this)

    }

    override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {

    }


    class SettingsFragment : PreferenceFragmentCompat() {
        val TAG = "Settings"

        companion object {
            lateinit var getContent: ActivityResultLauncher<String>
        }

        override fun onCreate(savedInstanceState: Bundle?) {
            getContent = registerForActivityResult(ActivityResultContracts.GetContent()) { uri: Uri? ->

                if (uri != null) {
                    try {
                        // Open a specific media item using ParcelFileDescriptor.
                        val resolver: ContentResolver =
                            requireActivity()
                                .contentResolver

                        // "rw" for read-and-write;
                        // "rwt" for truncating or overwriting existing file contents.
                        //val readOnlyMode = "r"
                        // uri - I have got from onActivityResult
                        val type = resolver.getType(uri)

                        var inputStream: InputStream? = resolver.openInputStream(uri)
                        val channels = ArrayList<String>()
                        if(type == "application/json"){
                            val json = inputStream?.bufferedReader()?.readLines()?.get(0)
                            val jsonObject = JSONTokener(json).nextValue() as JSONObject
                            Log.e(TAG,jsonObject.getJSONArray("subscriptions").toString())
                            for (i in 0 until jsonObject.getJSONArray("subscriptions").length()) {
                                var url = jsonObject.getJSONArray("subscriptions").getJSONObject(i).getString("url")
                                url = url.replace("https://www.youtube.com/channel/","")
                                Log.e(TAG,url)
                                channels.add(url)
                            }
                        }else {
                            if (type == "application/zip") {
                                val zis = ZipInputStream(inputStream)
                                var entry: ZipEntry? = zis.nextEntry
                                while (entry != null) {
                                    if (entry.name.endsWith(".csv")) {
                                        inputStream = zis
                                        break
                                    }
                                    entry = zis.nextEntry
                                }
                            }

                            inputStream?.bufferedReader()?.readLines()?.forEach {
                                if (it.isNotBlank()) {
                                    val channelId = it.substringBefore(",")
                                    if (channelId.length == 24)
                                        channels.add(channelId)
                                }
                            }
                        }
                        inputStream?.close()

                        subscribe(channels)
                    } catch (e: Exception) {
                        Log.e(TAG, e.toString())
                        Toast.makeText(
                            context,
                            R.string.error,
                            Toast.LENGTH_SHORT
                        ).show()
                    }
                }


            }
            super.onCreate(savedInstanceState)
        }

        override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
            setPreferencesFromResource(R.xml.settings, rootKey)
            val instance = findPreference<ListPreference>("instance")
            fetchInstance()
            instance?.setOnPreferenceChangeListener { _, newValue ->
                RetrofitInstance.url = newValue.toString()
                RetrofitInstance.lazyMgr.reset()
                val sharedPref = context?.getSharedPreferences("token", Context.MODE_PRIVATE)
                if (sharedPref?.getString("token", "") != "") {
                    with(sharedPref!!.edit()) {
                        putString("token", "")
                        apply()
                    }
                    Toast.makeText(context, R.string.loggedout, Toast.LENGTH_SHORT).show()
                }
                true
            }

            val login = findPreference<Preference>("login_register")
            login?.setOnPreferenceClickListener {
                val newFragment = LoginDialog()
                newFragment.show(childFragmentManager, "Login")
                true
            }

            val importFromYt = findPreference<Preference>("import_from_yt")
            importFromYt?.setOnPreferenceClickListener {
                val sharedPref = context?.getSharedPreferences("token", Context.MODE_PRIVATE)
                val token = sharedPref?.getString("token", "")!!
                //check StorageAccess
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
                    Log.d("myz", "" + Build.VERSION.SDK_INT)
                    if (ContextCompat.checkSelfPermission(
                            this.requireContext(),
                            Manifest.permission.READ_EXTERNAL_STORAGE
                        )
                        != PackageManager.PERMISSION_GRANTED
                    ) {
                        ActivityCompat.requestPermissions(
                            this.requireActivity(), arrayOf(
                                Manifest.permission.READ_EXTERNAL_STORAGE,
                                Manifest.permission.MANAGE_EXTERNAL_STORAGE
                            ), 1
                        ) //permission request code is just an int
                    } else if (token != "") {
                        getContent.launch("*/*")
                    } else {
                        Toast.makeText(context, R.string.login_first, Toast.LENGTH_SHORT).show()
                    }
                } else {
                    if (ActivityCompat.checkSelfPermission(
                            requireContext(),
                            Manifest.permission.READ_EXTERNAL_STORAGE
                        ) != PackageManager.PERMISSION_GRANTED || ActivityCompat.checkSelfPermission(
                            requireContext(),
                            Manifest.permission.WRITE_EXTERNAL_STORAGE
                        ) != PackageManager.PERMISSION_GRANTED
                    ) {
                        ActivityCompat.requestPermissions(
                            this.requireActivity(),
                            arrayOf(
                                Manifest.permission.READ_EXTERNAL_STORAGE,
                                Manifest.permission.WRITE_EXTERNAL_STORAGE
                            ),
                            1
                        )
                    } else if (token != "") {
                        getContent.launch("*/*")
                    } else {
                        Toast.makeText(context, R.string.login_first, Toast.LENGTH_SHORT).show()
                    }
                }
                true
            }

            val themeToggle = findPreference<ListPreference>("theme_togglee")
            themeToggle?.setOnPreferenceChangeListener { _, newValue ->
                when (newValue.toString()) {
                    "A" -> AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
                    "L" -> AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
                    "D" -> AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
                }
                true
            }

            val changeLanguage = findPreference<ListPreference>("language")
            changeLanguage?.setOnPreferenceChangeListener { _, _ ->
                val refresh = Intent(context, MainActivity::class.java)
                startActivity(refresh)
                true
            }

            val about = findPreference<Preference>("about")
            about?.setOnPreferenceClickListener {
                val uri = Uri.parse("https://libre-tube.github.io/")
                val intent = Intent(Intent.ACTION_VIEW).setData(uri)
                startActivity(intent)
                true
            }
        }

        private fun fetchInstance() {
            lifecycleScope.launchWhenCreated {
                val response = try {
                    RetrofitInstance.api.getInstances("https://instances.tokhmi.xyz/")
                } catch (e: IOException) {
                    println(e)
                    Log.e("settings", "IOException, you might not have internet connection")
                    return@launchWhenCreated
                } catch (e: HttpException) {
                    Log.e("settings", "HttpException, unexpected response $e")
                    return@launchWhenCreated
                } catch (e: Exception) {
                    Log.e("settings", e.toString())
                    return@launchWhenCreated
                }
                val listEntries: MutableList<String> = ArrayList()
                val listEntryValues: MutableList<String> = ArrayList()
                for (item in response) {
                    listEntries.add(item.name!!)
                    listEntryValues.add(item.api_url!!)
                }
                val entries = listEntries.toTypedArray<CharSequence>()
                val entryValues = listEntryValues.toTypedArray<CharSequence>()
                runOnUiThread {
                    val instance = findPreference<ListPreference>("instance")
                    instance?.entries = entries
                    instance?.entryValues = entryValues
                    instance?.summaryProvider =
                        Preference.SummaryProvider<ListPreference> { preference ->
                            val text = preference.entry
                            if (TextUtils.isEmpty(text)) {
                                "kavin.rocks (Official)"
                            } else {
                                text
                            }
                        }
                }
            }
        }

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


        private fun subscribe(channels: List<String>) {
            fun run() {
                lifecycleScope.launchWhenCreated {
                    val response = try {
                        val sharedPref = context?.getSharedPreferences("token", Context.MODE_PRIVATE)
                        RetrofitInstance.api.importSubscriptions(
                            false,
                            sharedPref?.getString("token", "")!!,
                            channels
                        )
                    } catch (e: IOException) {
                        Log.e(TAG, "IOException, you might not have internet connection")
                        return@launchWhenCreated
                    } catch (e: HttpException) {
                        Log.e(TAG, "HttpException, unexpected response$e")
                        return@launchWhenCreated
                    }
                    if (response.message == "ok") {
                        Toast.makeText(
                            context,
                            R.string.importsuccess,
                            Toast.LENGTH_SHORT
                        ).show()
                    }
                }
            }
            run()
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        PreferenceManager.getDefaultSharedPreferences(this)
            .unregisterOnSharedPreferenceChangeListener(this)
    }
}