/* 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.browser.engine.gecko.selection

import android.app.Activity
import android.content.Context
import android.view.MenuItem
import androidx.annotation.VisibleForTesting
import mozilla.components.concept.engine.selection.SelectionActionDelegate
import org.mozilla.geckoview.BasicSelectionActionDelegate

/**
 * An adapter between the GV [BasicSelectionActionDelegate] and a generic [SelectionActionDelegate].
 *
 * @param customDelegate handles as much of this logic as possible.
 */
open class GeckoSelectionActionDelegate(
    activity: Activity,
    @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
    internal val customDelegate: SelectionActionDelegate
) : BasicSelectionActionDelegate(activity) {

    companion object {
        /**
         * @returns a [GeckoSelectionActionDelegate] if [customDelegate] is non-null and [context]
         * is an instance of [Activity]. Otherwise, returns null.
         */
        fun maybeCreate(context: Context, customDelegate: SelectionActionDelegate?): GeckoSelectionActionDelegate? {
            return if (context is Activity && customDelegate != null) {
                GeckoSelectionActionDelegate(context, customDelegate)
            } else {
                null
            }
        }
    }

    override fun getAllActions(): Array<String> {
        return customDelegate.sortedActions(super.getAllActions() + customDelegate.getAllActions())
    }

    override fun isActionAvailable(id: String): Boolean {
        val selectedText = mSelection?.text

        val customActionIsAvailable = !selectedText.isNullOrEmpty() &&
        customDelegate.isActionAvailable(id, selectedText)

        return customActionIsAvailable ||
            super.isActionAvailable(id)
    }

    override fun prepareAction(id: String, item: MenuItem) {
        val title = customDelegate.getActionTitle(id)
            ?: return super.prepareAction(id, item)

        item.title = title
    }

    override fun performAction(id: String, item: MenuItem): Boolean {
        val selectedText = mSelection?.text ?: return super.performAction(id, item)

        return customDelegate.performAction(id, selectedText) || super.performAction(id, item)
    }
}
