/*
 * Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */
package com.wireguard.android.databinding

import android.text.InputFilter
import android.view.LayoutInflater
import android.view.View
import android.widget.EditText
import android.widget.LinearLayout
import android.widget.TextView
import androidx.databinding.BindingAdapter
import androidx.databinding.DataBindingUtil
import androidx.databinding.ObservableList
import androidx.databinding.ViewDataBinding
import androidx.databinding.adapters.ListenerUtil
import androidx.fragment.app.Fragment
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.wireguard.android.BR
import com.wireguard.android.R
import com.wireguard.android.databinding.ObservableKeyedRecyclerViewAdapter.RowConfigurationHandler
import com.wireguard.android.widget.ToggleSwitch
import com.wireguard.android.widget.ToggleSwitch.OnBeforeCheckedChangeListener
import com.wireguard.config.Attribute
import com.wireguard.config.InetNetwork
import java.net.InetAddress
import java.util.Optional

/**
 * Static methods for use by generated code in the Android data binding library.
 */
object BindingAdapters {
    @JvmStatic
    @BindingAdapter("checked")
    fun setChecked(view: ToggleSwitch, checked: Boolean) {
        view.setCheckedInternal(checked)
    }

    @JvmStatic
    @BindingAdapter("filter")
    fun setFilter(view: TextView, filter: InputFilter) {
        view.filters = arrayOf(filter)
    }

    @JvmStatic
    @BindingAdapter("items", "layout", "fragment")
    fun <E> setItems(view: LinearLayout,
                     oldList: ObservableList<E>?, oldLayoutId: Int, @Suppress("UNUSED_PARAMETER") oldFragment: Fragment?,
                     newList: ObservableList<E>?, newLayoutId: Int, newFragment: Fragment?) {
        if (oldList === newList && oldLayoutId == newLayoutId)
            return
        var listener: ItemChangeListener<E>? = ListenerUtil.getListener(view, R.id.item_change_listener)
        // If the layout changes, any existing listener must be replaced.
        if (listener != null && oldList != null && oldLayoutId != newLayoutId) {
            listener.setList(null)
            listener = null
            // Stop tracking the old listener.
            ListenerUtil.trackListener<Any?>(view, null, R.id.item_change_listener)
        }
        // Avoid adding a listener when there is no new list or layout.
        if (newList == null || newLayoutId == 0)
            return
        if (listener == null) {
            listener = ItemChangeListener(view, newLayoutId, newFragment)
            ListenerUtil.trackListener(view, listener, R.id.item_change_listener)
        }
        // Either the list changed, or this is an entirely new listener because the layout changed.
        listener.setList(newList)
    }

    @JvmStatic
    @BindingAdapter("items", "layout")
    fun <E> setItems(view: LinearLayout,
                     oldList: Iterable<E>?, oldLayoutId: Int,
                     newList: Iterable<E>?, newLayoutId: Int) {
        if (oldList === newList && oldLayoutId == newLayoutId)
            return
        view.removeAllViews()
        if (newList == null)
            return
        val layoutInflater = LayoutInflater.from(view.context)
        for (item in newList) {
            val binding = DataBindingUtil.inflate<ViewDataBinding>(layoutInflater, newLayoutId, view, false)
            binding.setVariable(BR.collection, newList)
            binding.setVariable(BR.item, item)
            binding.executePendingBindings()
            view.addView(binding.root)
        }
    }

    @JvmStatic
    @BindingAdapter(requireAll = false, value = ["items", "layout", "configurationHandler"])
    fun <K, E : Keyed<out K>> setItems(view: RecyclerView,
                                       oldList: ObservableKeyedArrayList<K, E>?, oldLayoutId: Int,
                                       @Suppress("UNUSED_PARAMETER") oldRowConfigurationHandler: RowConfigurationHandler<*, *>?,
                                       newList: ObservableKeyedArrayList<K, E>?, newLayoutId: Int,
                                       newRowConfigurationHandler: RowConfigurationHandler<*, *>?) {
        if (view.layoutManager == null)
            view.layoutManager = LinearLayoutManager(view.context, RecyclerView.VERTICAL, false)
        if (oldList === newList && oldLayoutId == newLayoutId)
            return
        // The ListAdapter interface is not generic, so this cannot be checked.
        @Suppress("UNCHECKED_CAST") var adapter = view.adapter as? ObservableKeyedRecyclerViewAdapter<K, E>?
        // If the layout changes, any existing adapter must be replaced.
        if (adapter != null && oldList != null && oldLayoutId != newLayoutId) {
            adapter.setList(null)
            adapter = null
        }
        // Avoid setting an adapter when there is no new list or layout.
        if (newList == null || newLayoutId == 0)
            return
        if (adapter == null) {
            adapter = ObservableKeyedRecyclerViewAdapter(view.context, newLayoutId, newList)
            view.adapter = adapter
        }
        adapter.setRowConfigurationHandler(newRowConfigurationHandler)
        // Either the list changed, or this is an entirely new listener because the layout changed.
        adapter.setList(newList)
    }

    @JvmStatic
    @BindingAdapter("onBeforeCheckedChanged")
    fun setOnBeforeCheckedChanged(view: ToggleSwitch,
                                  listener: OnBeforeCheckedChangeListener?) {
        view.setOnBeforeCheckedChangeListener(listener)
    }

    @JvmStatic
    @BindingAdapter("onFocusChange")
    fun setOnFocusChange(view: EditText,
                         listener: View.OnFocusChangeListener?) {
        view.setOnFocusChangeListener(listener)
    }

    @JvmStatic
    @BindingAdapter("android:text")
    fun setOptionalText(view: TextView, text: Optional<*>?) {
        view.text = text?.map { it.toString() }?.orElse("") ?: ""
    }

    @JvmStatic
    @BindingAdapter("android:text")
    fun setInetNetworkSetText(view: TextView, networks: Iterable<InetNetwork?>?) {
        view.text = if (networks != null) Attribute.join(networks) else ""
    }

    @JvmStatic
    @BindingAdapter("android:text")
    fun setInetAddressSetText(view: TextView, addresses: Iterable<InetAddress?>?) {
        view.text = if (addresses != null) Attribute.join(addresses.map { it?.hostAddress }) else ""
    }

    @JvmStatic
    fun tryParseInt(s: String?): Int {
        if (s == null)
            return 0
        return try {
            Integer.parseInt(s)
        } catch (_: Throwable) {
            0
        }
    }
}