fenix/app/src/main/java/org/mozilla/fenix/library/history/HistoryView.kt

/* 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 org.mozilla.fenix.library.history

import android.graphics.PorterDuff
import android.graphics.PorterDuffColorFilter
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageButton
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.Toolbar
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.core.content.ContextCompat
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.SimpleItemAnimator
import kotlinx.android.extensions.LayoutContainer
import kotlinx.android.synthetic.main.component_history.view.*
import mozilla.components.support.base.feature.BackHandler
import org.mozilla.fenix.R
import org.mozilla.fenix.ext.asActivity
import org.mozilla.fenix.ext.getColorResFromAttr

/**
 * Interface for the HistoryViewInteractor. This interface is implemented by objects that want
 * to respond to user interaction on the HistoryView
 */
interface HistoryViewInteractor {
    /**
     * Called when a user taps a history item
     */
    fun onItemPress(item: HistoryItem)

    /**
     * Called when a user long clicks a user
     */
    fun onItemLongPress(item: HistoryItem)

    /**
     * Called on backpressed to exit edit mode
     */
    fun onBackPressed(): Boolean

    /**
     * Called when the mode is switched so we can invalidate the menu
     */
    fun onModeSwitched()

    /**
     * Called when delete all is tapped
     */
    fun onDeleteAll()

    /**
     * Called when one history item is deleted
     * @param item the history item to delete
     */
    fun onDeleteOne(item: HistoryItem)

    /**
     * Called when multiple history items are deleted
     * @param items the history items to delete
     */
    fun onDeleteSome(items: Set<HistoryItem>)
}

/**
 * View that contains and configures the History List
 */
class HistoryView(
    private val container: ViewGroup,
    val interactor: HistoryInteractor
) : LayoutContainer, BackHandler {

    val view: ConstraintLayout = LayoutInflater.from(container.context)
        .inflate(R.layout.component_history, container, true)
        .findViewById(R.id.history_wrapper)

    override val containerView: View?
        get() = container

    val historyAdapter: HistoryAdapter
    private var items: List<HistoryItem> = listOf()
    private val context = container.context
    var mode: HistoryState.Mode = HistoryState.Mode.Normal
        private set
    private val activity = context?.asActivity()
    private val layoutManager = LinearLayoutManager(container.context)
    init {
        historyAdapter = HistoryAdapter(interactor)

        view.history_list.apply {
            layoutManager = this@HistoryView.layoutManager
            adapter = historyAdapter
            (itemAnimator as SimpleItemAnimator).supportsChangeAnimations = false
        }
    }

    fun update(state: HistoryState) {
        view.progress_bar.visibility =
            if (state.mode is HistoryState.Mode.Deleting) View.VISIBLE else View.GONE

        if (state.mode != mode) {
            interactor.onModeSwitched()
            historyAdapter.updateMode(state.mode)

            val oldMode = mode
            if (oldMode is HistoryState.Mode.Editing) {
                oldMode.selectedItems.forEach {
                    historyAdapter.notifyItemChanged(it.id)
                }
            }
        }

        (state.mode as? HistoryState.Mode.Editing)?.also {
            val oldMode = (mode as? HistoryState.Mode.Editing)
            val unselectedItems = oldMode?.selectedItems?.minus(it.selectedItems) ?: setOf()

            it.selectedItems.union(unselectedItems).forEach { item ->
                historyAdapter.notifyItemChanged(item.id)
            }
        }

        items = state.items
        when (val mode = state.mode) {
            is HistoryState.Mode.Normal -> setUIForNormalMode()
            is HistoryState.Mode.Editing -> setUIForSelectingMode(mode.selectedItems.size)
        }

        mode = state.mode
    }

    private fun setUIForSelectingMode(selectedItemSize: Int) {
        activity?.title =
            context.getString(R.string.history_multi_select_title, selectedItemSize)
        setToolbarColors(
            R.color.white_color,
            context!!.getColorResFromAttr(R.attr.accentHighContrast)
        )
    }

    private fun setUIForNormalMode() {
        activity?.title = context.getString(R.string.library_history)
//        history_list?.isVisible = !isEmpty
//        history_empty_view.isVisible = isEmpty
        setToolbarColors(
            context!!.getColorResFromAttr(R.attr.primaryText),
            context.getColorResFromAttr(R.attr.foundation)
        )
    }

    private fun setToolbarColors(foreground: Int, background: Int) {
        val toolbar = (activity as AppCompatActivity).findViewById<Toolbar>(R.id.navigationToolbar)
        val colorFilter = PorterDuffColorFilter(
            ContextCompat.getColor(context, foreground),
            PorterDuff.Mode.SRC_IN
        )
        toolbar.setBackgroundColor(ContextCompat.getColor(context, background))
        toolbar.setTitleTextColor(ContextCompat.getColor(context, foreground))

        themeToolbar(
            toolbar, foreground,
            background, colorFilter
        )
    }

    private fun themeToolbar(
        toolbar: Toolbar,
        textColor: Int,
        backgroundColor: Int,
        colorFilter: PorterDuffColorFilter? = null
    ) {
        toolbar.setTitleTextColor(ContextCompat.getColor(context!!, textColor))
        toolbar.setBackgroundColor(ContextCompat.getColor(context, backgroundColor))

        if (colorFilter == null) {
            return
        }

        toolbar.overflowIcon?.colorFilter = colorFilter
        (0 until toolbar.childCount).forEach {
            when (val item = toolbar.getChildAt(it)) {
                is ImageButton -> item.drawable.colorFilter = colorFilter
            }
        }
    }

    override fun onBackPressed(): Boolean {
        return interactor.onBackPressed()
    }
}