package com.topjohnwu.magisk.ui.settings

import android.content.SharedPreferences
import android.os.Build
import android.os.Bundle
import android.os.Environment
import android.view.LayoutInflater
import android.widget.EditText
import android.widget.Toast
import androidx.appcompat.app.AlertDialog
import androidx.databinding.DataBindingUtil
import androidx.preference.ListPreference
import androidx.preference.Preference
import androidx.preference.PreferenceCategory
import androidx.preference.SwitchPreferenceCompat
import com.topjohnwu.magisk.*
import com.topjohnwu.magisk.base.BasePreferenceFragment
import com.topjohnwu.magisk.data.database.RepoDao
import com.topjohnwu.magisk.databinding.CustomDownloadDialogBinding
import com.topjohnwu.magisk.databinding.DialogCustomNameBinding
import com.topjohnwu.magisk.extensions.subscribeK
import com.topjohnwu.magisk.extensions.toLangTag
import com.topjohnwu.magisk.model.download.DownloadService
import com.topjohnwu.magisk.model.entity.internal.Configuration
import com.topjohnwu.magisk.model.entity.internal.DownloadSubject
import com.topjohnwu.magisk.model.observer.Observer
import com.topjohnwu.magisk.utils.*
import com.topjohnwu.magisk.view.dialogs.FingerprintAuthDialog
import com.topjohnwu.superuser.Shell
import io.reactivex.Completable
import org.koin.android.ext.android.inject
import java.io.File

class SettingsFragment : BasePreferenceFragment() {

    private val repoDB: RepoDao by inject()

    private lateinit var updateChannel: ListPreference
    private lateinit var autoRes: ListPreference
    private lateinit var suNotification: ListPreference
    private lateinit var requestTimeout: ListPreference
    private lateinit var rootConfig: ListPreference
    private lateinit var multiuserConfig: ListPreference
    private lateinit var nsConfig: ListPreference

    override fun onStart() {
        super.onStart()
        setHasOptionsMenu(true)
        requireActivity().setTitle(R.string.settings)
    }

    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
        preferenceManager.setStorageDeviceProtected()
        setPreferencesFromResource(R.xml.app_settings, rootKey)

        // Get preferences
        updateChannel = findPreference(Config.Key.UPDATE_CHANNEL)!!
        rootConfig = findPreference(Config.Key.ROOT_ACCESS)!!
        autoRes = findPreference(Config.Key.SU_AUTO_RESPONSE)!!
        requestTimeout = findPreference(Config.Key.SU_REQUEST_TIMEOUT)!!
        suNotification = findPreference(Config.Key.SU_NOTIFICATION)!!
        multiuserConfig = findPreference(Config.Key.SU_MULTIUSER_MODE)!!
        nsConfig = findPreference(Config.Key.SU_MNT_NS)!!
        val reauth = findPreference<SwitchPreferenceCompat>(Config.Key.SU_REAUTH)!!
        val fingerprint = findPreference<SwitchPreferenceCompat>(Config.Key.SU_FINGERPRINT)!!
        val generalCatagory = findPreference<PreferenceCategory>("general")!!
        val magiskCategory = findPreference<PreferenceCategory>("magisk")!!
        val suCategory = findPreference<PreferenceCategory>("superuser")!!
        val hideManager = findPreference<Preference>("hide")!!
        val restoreManager = findPreference<Preference>("restore")!!

        // Remove/Disable entries

        // Only show canary channels if user is already on canary channel
        // or the user have already chosen canary channel
        if (!Utils.isCanary && Config.updateChannel < Config.Value.CANARY_CHANNEL) {
            // Remove the last 2 entries
            val entries = updateChannel.entries
            updateChannel.entries = entries.copyOf(entries.size - 2)
        }

        // Remove dangerous settings in secondary user
        if (Const.USER_ID > 0) {
            suCategory.removePreference(multiuserConfig)
        }

        // Remove re-authentication option on Android O, it will not work
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            suCategory.removePreference(reauth)
        }

        // Disable fingerprint option if not possible
        if (!FingerprintHelper.canUseFingerprint()) {
            fingerprint.isEnabled = false
            fingerprint.isChecked = false
            fingerprint.setSummary(R.string.disable_fingerprint)
        }

        if (Const.USER_ID == 0 && Info.isConnected.value && Shell.rootAccess()) {
            if (activity.packageName == BuildConfig.APPLICATION_ID) {
                generalCatagory.removePreference(restoreManager)
                hideManager.setOnPreferenceClickListener {
                    showManagerNameDialog {
                        PatchAPK.hideManager(requireContext(), it)
                    }
                    true
                }
            } else {
                generalCatagory.removePreference(hideManager)
                restoreManager.setOnPreferenceClickListener {
                    DownloadService(requireContext()) {
                        subject = DownloadSubject.Manager(Configuration.APK.Restore)
                    }
                    true
                }
            }
        } else {
            // Remove if not primary user, no connection, or no root
            generalCatagory.removePreference(restoreManager)
            generalCatagory.removePreference(hideManager)
        }

        if (!Utils.showSuperUser()) {
            preferenceScreen.removePreference(suCategory)
        }

        if (!Shell.rootAccess()) {
            preferenceScreen.removePreference(magiskCategory)
            generalCatagory.removePreference(hideManager)
        }

        findPreference<Preference>("clear")?.setOnPreferenceClickListener {
            Completable.fromAction { repoDB.clear() }.subscribeK {
                Utils.toast(R.string.repo_cache_cleared, Toast.LENGTH_SHORT)
            }
            true
        }
        findPreference<Preference>("hosts")?.setOnPreferenceClickListener {
            Shell.su("add_hosts_module").submit {
                Utils.toast(R.string.settings_hosts_toast, Toast.LENGTH_SHORT)
            }
            true
        }

        findPreference<Preference>(Config.Key.DOWNLOAD_PATH)?.apply {
            summary = Config.downloadPath
        }?.setOnPreferenceClickListener { preference ->
            activity.withExternalRW {
                onSuccess {
                    showDownloadDialog {
                        Config.downloadPath = it
                        preference.summary = it
                    }
                }
            }
            true
        }

        updateChannel.setOnPreferenceChangeListener { _, value ->
            val channel = Integer.parseInt(value as String)
            val previous = Config.updateChannel

            if (channel == Config.Value.CUSTOM_CHANNEL) {
                showUrlDialog(Config.customChannelUrl, {
                    Config.updateChannel = previous
                }, {
                    Config.customChannelUrl = it
                })
            }
            true
        }

        setLocalePreference(findPreference(Config.Key.LOCALE)!!)

        setSummary()
    }

    override fun onSharedPreferenceChanged(prefs: SharedPreferences, key: String) {
        fun getStrInt() = prefs.getString(key, null)?.toInt() ?: 0

        when (key) {
            Config.Key.ROOT_ACCESS -> Config.rootMode = getStrInt()
            Config.Key.SU_MULTIUSER_MODE -> Config.suMultiuserMode = getStrInt()
            Config.Key.SU_MNT_NS -> Config.suMntNamespaceMode = getStrInt()
            Config.Key.DARK_THEME -> requireActivity().recreate()
            Config.Key.COREONLY -> {
                if (prefs.getBoolean(key, false)) {
                    runCatching {
                        Const.MAGISK_DISABLE_FILE.createNewFile()
                    }
                } else {
                    Const.MAGISK_DISABLE_FILE.delete()
                }
                Utils.toast(R.string.settings_reboot_toast, Toast.LENGTH_LONG)
            }
            Config.Key.MAGISKHIDE -> if (prefs.getBoolean(key, false)) {
                Shell.su("magiskhide --enable").submit()
            } else {
                Shell.su("magiskhide --disable").submit()
            }
            Config.Key.LOCALE -> {
                ResourceMgr.reload()
                activity.recreate()
            }
            Config.Key.CHECK_UPDATES -> Utils.scheduleUpdateCheck(activity)
        }
        setSummary(key)
    }

    override fun onPreferenceTreeClick(preference: Preference): Boolean {
        when (preference.key) {
            Config.Key.SU_FINGERPRINT -> {
                val checked = (preference as SwitchPreferenceCompat).isChecked
                preference.isChecked = !checked
                FingerprintAuthDialog(requireActivity()) {
                    preference.isChecked = checked
                    Config.suFingerprint = checked
                }.show()
            }
        }
        return true
    }

    private fun setLocalePreference(lp: ListPreference) {
        lp.isEnabled = false
        availableLocales.map {
            val names = mutableListOf<String>()
            val values = mutableListOf<String>()

            names.add(
                ResourceMgr.getString(defaultLocale, R.string.system_default)
            )
            values.add("")

            it.forEach { locale ->
                names.add(locale.getDisplayName(locale))
                values.add(locale.toLangTag())
            }

            Pair(names.toTypedArray(), values.toTypedArray())
        }.subscribeK { (names, values) ->
            lp.isEnabled = true
            lp.entries = names
            lp.entryValues = values
            lp.summary = currentLocale.getDisplayName(currentLocale)
        }
    }

    private fun setSummary(key: String) {
        when (key) {
            Config.Key.ROOT_ACCESS -> rootConfig.summary = resources
                .getStringArray(R.array.su_access)[Config.rootMode]
            Config.Key.SU_MULTIUSER_MODE -> multiuserConfig.summary = resources
                .getStringArray(R.array.multiuser_summary)[Config.suMultiuserMode]
            Config.Key.SU_MNT_NS -> nsConfig.summary = resources
                .getStringArray(R.array.namespace_summary)[Config.suMntNamespaceMode]
            Config.Key.UPDATE_CHANNEL -> {
                var ch = Config.updateChannel
                ch = if (ch < 0) Config.Value.STABLE_CHANNEL else ch
                updateChannel.summary = resources
                    .getStringArray(R.array.update_channel)[ch]
            }
            Config.Key.SU_AUTO_RESPONSE -> autoRes.summary = resources
                .getStringArray(R.array.auto_response)[Config.suAutoReponse]
            Config.Key.SU_NOTIFICATION -> suNotification.summary = resources
                .getStringArray(R.array.su_notification)[Config.suNotification]
            Config.Key.SU_REQUEST_TIMEOUT -> requestTimeout.summary =
                getString(R.string.request_timeout_summary, Config.suDefaultTimeout)
        }
    }

    private fun setSummary() {
        setSummary(Config.Key.ROOT_ACCESS)
        setSummary(Config.Key.SU_MULTIUSER_MODE)
        setSummary(Config.Key.SU_MNT_NS)
        setSummary(Config.Key.UPDATE_CHANNEL)
        setSummary(Config.Key.SU_AUTO_RESPONSE)
        setSummary(Config.Key.SU_NOTIFICATION)
        setSummary(Config.Key.SU_REQUEST_TIMEOUT)
    }

    private inline fun showUrlDialog(
        initialValue: String,
        crossinline onCancel: () -> Unit = {},
        crossinline onSuccess: (String) -> Unit
    ) {
        val v = LayoutInflater
            .from(requireActivity())
            .inflate(R.layout.custom_channel_dialog, null)

        val url = v.findViewById<EditText>(R.id.custom_url).apply {
            setText(initialValue)
        }

        AlertDialog.Builder(requireActivity())
            .setTitle(R.string.settings_update_custom)
            .setView(v)
            .setPositiveButton(R.string.ok) { _, _ -> onSuccess(url.text.toString()) }
            .setNegativeButton(R.string.close) { _, _ -> onCancel() }
            .setOnCancelListener { onCancel() }
            .show()
    }

    inner class DownloadDialogData(initialValue: String) {
        val text = KObservableField(initialValue)
        val path = Observer(text) {
            File(Environment.getExternalStorageDirectory(), text.value).absolutePath
        }
    }

    private inline fun showDownloadDialog(
        initialValue: String = Config.downloadPath,
        crossinline onSuccess: (String) -> Unit
    ) {
        val data = DownloadDialogData(initialValue)
        val binding: CustomDownloadDialogBinding = DataBindingUtil
            .inflate(layoutInflater, R.layout.custom_download_dialog, null, false)
        binding.also { it.data = data }

        AlertDialog.Builder(requireActivity())
            .setTitle(R.string.settings_download_path_title)
            .setView(binding.root)
            .setPositiveButton(R.string.ok) { _, _ ->
                Utils.ensureDownloadPath(data.text.value)?.let { onSuccess(data.text.value) }
                    ?: Utils.toast(R.string.settings_download_path_error, Toast.LENGTH_SHORT)
            }
            .setNegativeButton(R.string.close, null)
            .show()
    }

    private inline fun showManagerNameDialog(
        crossinline onSuccess: (String) -> Unit
    ) {
        val data = ManagerNameData()
        val view = DialogCustomNameBinding
            .inflate(LayoutInflater.from(requireContext()))
            .also { it.data = data }

        AlertDialog.Builder(requireActivity())
            .setTitle(R.string.settings_app_name)
            .setView(view.root)
            .setPositiveButton(R.string.ok) { _, _ ->
                if (view.dialogNameInput.error.isNullOrBlank()) {
                    onSuccess(data.name.value)
                }
            }
            .setNegativeButton(R.string.close, null)
            .show()
    }

    inner class ManagerNameData {
        val name = KObservableField(resources.getString(R.string.re_app_name))
    }
}
