/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package mozilla.components.feature.prompts.dialog

import android.annotation.SuppressLint
import android.app.Dialog
import android.content.DialogInterface
import android.os.Bundle
import android.os.Parcelable
import android.view.LayoutInflater
import android.view.View
import androidx.annotation.VisibleForTesting
import androidx.annotation.VisibleForTesting.PRIVATE
import androidx.appcompat.app.AlertDialog
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import mozilla.components.concept.engine.prompt.Choice
import mozilla.components.feature.prompts.R

private const val KEY_CHOICES = "KEY_CHOICES"
private const val KEY_DIALOG_TYPE = "KEY_DIALOG_TYPE"

/**
 * [android.support.v4.app.DialogFragment] implementation to display choice(options,optgroup and menu)
 * web content in native dialogs.
 */
internal class ChoiceDialogFragment : PromptDialogFragment() {

    @VisibleForTesting
    internal val choices: Array<Choice> by lazy {
        safeArguments.getParcelableArray(KEY_CHOICES)!!.toArrayOfChoices()
    }

    @VisibleForTesting
    internal val dialogType: Int by lazy { safeArguments.getInt(KEY_DIALOG_TYPE) }

    internal val isSingleChoice get() = dialogType == SINGLE_CHOICE_DIALOG_TYPE

    internal val isMenuChoice get() = dialogType == MENU_CHOICE_DIALOG_TYPE

    internal val mapSelectChoice by lazy { HashMap<Choice, Choice>() }

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        return when (dialogType) {
            SINGLE_CHOICE_DIALOG_TYPE -> createSingleChoiceDialog()
            MULTIPLE_CHOICE_DIALOG_TYPE -> createMultipleChoiceDialog()
            MENU_CHOICE_DIALOG_TYPE -> createSingleChoiceDialog()
            else -> throw IllegalArgumentException(" $dialogType is not a valid choice dialog type")
        }
    }

    companion object {
        fun newInstance(
            choices: Array<Choice>,
            sessionId: String,
            dialogType: Int
        ): ChoiceDialogFragment {
            val fragment = ChoiceDialogFragment()
            val arguments = fragment.arguments ?: Bundle()

            with(arguments) {
                putParcelableArray(KEY_CHOICES, choices)
                putString(KEY_SESSION_ID, sessionId)
                putInt(KEY_DIALOG_TYPE, dialogType)
            }

            fragment.arguments = arguments

            return fragment
        }

        const val SINGLE_CHOICE_DIALOG_TYPE = 0
        const val MULTIPLE_CHOICE_DIALOG_TYPE = 1
        const val MENU_CHOICE_DIALOG_TYPE = 2
    }

    @SuppressLint("InflateParams")
    internal fun createDialogContentView(inflater: LayoutInflater): View {
        val index = choices.indexOfFirst { it.selected }
        val view = inflater.inflate(R.layout.mozac_feature_choice_dialogs, null)
        view.findViewById<RecyclerView>(R.id.recyclerView).apply {
            layoutManager = LinearLayoutManager(context, RecyclerView.VERTICAL, false).also {
                it.scrollToPosition(index)
            }
            adapter = ChoiceAdapter(this@ChoiceDialogFragment, inflater)
        }
        return view
    }

    fun onSelect(selectedChoice: Choice) {
        feature?.onConfirm(sessionId, selectedChoice)
        dismiss()
    }

    override fun onCancel(dialog: DialogInterface) {
        super.onCancel(dialog)
        feature?.onCancel(sessionId)
    }

    private fun createSingleChoiceDialog(): AlertDialog {
        val builder = AlertDialog.Builder(requireContext())
        val inflater = LayoutInflater.from(requireContext())
        val view = createDialogContentView(inflater)

        return builder.setView(view)
            .setOnDismissListener {
                feature?.onCancel(sessionId)
            }.create()
    }

    private fun createMultipleChoiceDialog(): AlertDialog {
        val builder = AlertDialog.Builder(requireContext())
        val inflater = LayoutInflater.from(requireContext())
        val view = createDialogContentView(inflater)

        return builder.setView(view)
            .setNegativeButton(R.string.mozac_feature_prompts_cancel) { _, _ ->
                feature?.onCancel(sessionId)
            }
            .setPositiveButton(R.string.mozac_feature_prompts_ok) { _, _ ->
                feature?.onConfirm(sessionId, mapSelectChoice.keys.toTypedArray())
            }.setOnDismissListener {
                feature?.onCancel(sessionId)
            }.create()
    }
}

@Suppress("UNCHECKED_CAST")
@VisibleForTesting(otherwise = PRIVATE)
internal fun Array<Parcelable>.toArrayOfChoices(): Array<Choice> {
    return if (this.isArrayOf<Choice>()) {
        this as Array<Choice>
    } else {
        Array(this.size) { index ->
            this[index] as Choice
        }
    }
}
