package im.angry.openeuicc.ui

import android.content.Intent
import android.net.Uri
import android.os.Build
import android.os.Bundle
import android.provider.Settings
import android.widget.Toast
import androidx.lifecycle.lifecycleScope
import androidx.preference.CheckBoxPreference
import androidx.preference.ListPreference
import androidx.preference.Preference
import androidx.preference.PreferenceCategory
import androidx.preference.PreferenceFragmentCompat
import im.angry.openeuicc.common.R
import im.angry.openeuicc.util.PreferenceFlowWrapper
import im.angry.openeuicc.util.preferenceRepository
import im.angry.openeuicc.util.selfAppVersion
import im.angry.openeuicc.util.setupRootViewInsets
import kotlinx.coroutines.flow.collect
import kotlinx.coroutines.flow.onEach
import kotlinx.coroutines.launch

open class SettingsFragment : PreferenceFragmentCompat() {
    private lateinit var developerPref: PreferenceCategory

    // Hidden developer options switch
    private var numClicks = 0
    private var lastClickTimestamp = -1L
    private var lastToast: Toast? = null

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

        developerPref = requirePreference("pref_developer")

        // Show / hide developer preference based on whether it is enabled
        lifecycleScope.launch {
            preferenceRepository.developerOptionsEnabledFlow
                .onEach(developerPref::setVisible)
                .collect()
        }

        requirePreference<Preference>("pref_info_app_version").apply {
            summary = requireContext().selfAppVersion

            // Enable developer options when this is clicked for 7 times
            setOnPreferenceClickListener(::onAppVersionClicked)
        }

        requirePreference<Preference>("pref_advanced_language").apply {
            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU) return@apply
            isVisible = true
            intent = Intent(Settings.ACTION_APP_LOCALE_SETTINGS).apply {
                data = Uri.fromParts("package", requireContext().packageName, null)
            }
        }

        requirePreference<Preference>("pref_advanced_logs").apply {
            intent = Intent(requireContext(), LogsActivity::class.java)
        }

        requirePreference<CheckBoxPreference>("pref_notifications_download")
            .bindBooleanFlow(preferenceRepository.notificationDownloadFlow)

        requirePreference<CheckBoxPreference>("pref_notifications_delete")
            .bindBooleanFlow(preferenceRepository.notificationDeleteFlow)

        requirePreference<CheckBoxPreference>("pref_notifications_switch")
            .bindBooleanFlow(preferenceRepository.notificationSwitchFlow)

        requirePreference<CheckBoxPreference>("pref_advanced_disable_safeguard_removable_esim")
            .bindBooleanFlow(preferenceRepository.disableSafeguardFlow)

        requirePreference<CheckBoxPreference>("pref_advanced_verbose_logging")
            .bindBooleanFlow(preferenceRepository.verboseLoggingFlow)

        requirePreference<CheckBoxPreference>("pref_developer_unfiltered_profile_list")
            .bindBooleanFlow(preferenceRepository.unfilteredProfileListFlow)

        requirePreference<CheckBoxPreference>("pref_developer_ignore_tls_certificate")
            .bindBooleanFlow(preferenceRepository.ignoreTLSCertificateFlow)

        requirePreference<CheckBoxPreference>("pref_developer_refresh_after_switch")
            .bindBooleanFlow(preferenceRepository.refreshAfterSwitchFlow)

        requirePreference<ListPreference>("pref_developer_es10x_mss")
            .bindIntFlow(preferenceRepository.es10xMssFlow, 63)

        requirePreference<Preference>("pref_developer_isdr_aid_list").apply {
            intent = Intent(requireContext(), IsdrAidListActivity::class.java)
        }
    }

    protected fun <T : Preference> requirePreference(key: CharSequence) =
        findPreference<T>(key)!!

    override fun onStart() {
        super.onStart()
        setupRootViewInsets(requireView().requireViewById(R.id.recycler_view))
    }

    @Suppress("UNUSED_PARAMETER")
    private fun onAppVersionClicked(pref: Preference): Boolean {
        if (developerPref.isVisible) return false

        val now = System.currentTimeMillis()
        numClicks = if (now - lastClickTimestamp >= 1000) 1 else numClicks + 1
        lastClickTimestamp = now

        lifecycleScope.launch {
            preferenceRepository.developerOptionsEnabledFlow.updatePreference(numClicks >= 7)
        }

        val toastText = when {
            numClicks == 7 -> getString(R.string.developer_options_enabled)
            numClicks > 1 -> getString(R.string.developer_options_steps, 7 - numClicks)
            else -> return true
        }

        lastToast?.cancel()
        lastToast = Toast.makeText(requireContext(), toastText, Toast.LENGTH_SHORT)
        lastToast!!.show()
        return true
    }

    protected fun CheckBoxPreference.bindBooleanFlow(flow: PreferenceFlowWrapper<Boolean>) {
        lifecycleScope.launch {
            flow.collect(::setChecked)
        }

        setOnPreferenceChangeListener { _, newValue ->
            lifecycleScope.launch {
                flow.updatePreference(newValue as Boolean)
            }
            true
        }
    }

    private fun ListPreference.bindIntFlow(flow: PreferenceFlowWrapper<Int>, defaultValue: Int) {
        lifecycleScope.launch {
            flow.collect { value = it.toString() }
        }

        setOnPreferenceChangeListener { _, newValue ->
            lifecycleScope.launch {
                flow.updatePreference((newValue as String).toIntOrNull() ?: defaultValue)
            }
            true
        }
    }

    protected fun mergePreferenceOverlay(overlayKey: String, targetKey: String) {
        val overlayCat = requirePreference<PreferenceCategory>(overlayKey)
        val targetCat = requirePreference<PreferenceCategory>(targetKey)

        val prefs = buildList {
            for (i in 0..<overlayCat.preferenceCount) {
                add(overlayCat.getPreference(i))
            }
        }

        prefs.forEach {
            overlayCat.removePreference(it)
            targetCat.addPreference(it)
        }

        overlayCat.parent?.removePreference(overlayCat)
    }
}