/* 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.components.toolbar

import android.content.Context
import androidx.annotation.ColorRes
import androidx.annotation.VisibleForTesting
import androidx.core.content.ContextCompat.getColor
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.lifecycleScope
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.collect
import kotlinx.coroutines.flow.mapNotNull
import kotlinx.coroutines.launch
import mozilla.components.browser.menu.BrowserMenuHighlight
import mozilla.components.browser.menu.WebExtensionBrowserMenuBuilder
import mozilla.components.browser.menu.item.BrowserMenuDivider
import mozilla.components.browser.menu.item.BrowserMenuHighlightableItem
import mozilla.components.browser.menu.item.BrowserMenuImageSwitch
import mozilla.components.browser.menu.item.BrowserMenuImageText
import mozilla.components.browser.menu.item.BrowserMenuItemToolbar
import mozilla.components.browser.menu.item.WebExtensionPlaceholderMenuItem
import mozilla.components.browser.state.selector.findTab
import mozilla.components.browser.state.selector.selectedTab
import mozilla.components.browser.state.state.TabSessionState
import mozilla.components.browser.state.store.BrowserStore
import mozilla.components.concept.storage.BookmarksStorage
import mozilla.components.feature.webcompat.reporter.WebCompatReporterFeature
import mozilla.components.lib.state.ext.flowScoped
import mozilla.components.support.ktx.android.content.getColorFromAttr
import mozilla.components.support.ktx.kotlinx.coroutines.flow.ifAnyChanged
import org.mozilla.fenix.FeatureFlags
import org.mozilla.fenix.HomeActivity
import org.mozilla.fenix.R
import org.mozilla.fenix.browser.browsingmode.BrowsingMode
import org.mozilla.fenix.ext.asActivity
import org.mozilla.fenix.ext.components
import org.mozilla.fenix.ext.settings
import org.mozilla.fenix.theme.ThemeManager

/**
 * Builds the toolbar object used with the 3-dot menu in the browser fragment.
 * @param store reference to the application's [BrowserStore].
 * @param hasAccountProblem If true, there was a problem signing into the Firefox account.
 * @param shouldReverseItems If true, reverse the menu items.
 * @param onItemTapped Called when a menu item is tapped.
 * @param lifecycleOwner View lifecycle owner used to determine when to cancel UI jobs.
 * @param bookmarksStorage Used to check if a page is bookmarked.
 */
@Suppress("LargeClass", "LongParameterList")
@ExperimentalCoroutinesApi
class DefaultToolbarMenu(
    private val context: Context,
    private val store: BrowserStore,
    hasAccountProblem: Boolean = false,
    shouldReverseItems: Boolean,
    private val onItemTapped: (ToolbarMenu.Item) -> Unit = {},
    private val lifecycleOwner: LifecycleOwner,
    private val bookmarksStorage: BookmarksStorage,
    val isPinningSupported: Boolean
) : ToolbarMenu {

    private var currentUrlIsBookmarked = false
    private var isBookmarkedJob: Job? = null

    private val selectedSession: TabSessionState? get() = store.state.selectedTab

    override val menuBuilder by lazy {
        WebExtensionBrowserMenuBuilder(
            items =
                if (FeatureFlags.toolbarMenuFeature) {
                    newCoreMenuItems
                } else {
                    oldCoreMenuItems
                },
            endOfMenuAlwaysVisible = !shouldReverseItems,
            store = store,
            webExtIconTintColorResource = primaryTextColor(),
            onAddonsManagerTapped = {
                onItemTapped.invoke(ToolbarMenu.Item.AddonsManager)
            },
            appendExtensionSubMenuAtStart = !shouldReverseItems
        )
    }

    override val menuToolbar by lazy {
        val back = BrowserMenuItemToolbar.TwoStateButton(
            primaryImageResource = mozilla.components.ui.icons.R.drawable.mozac_ic_back,
            primaryContentDescription = context.getString(R.string.browser_menu_back),
            primaryImageTintResource = primaryTextColor(),
            isInPrimaryState = {
                selectedSession?.content?.canGoBack ?: true
            },
            secondaryImageTintResource = ThemeManager.resolveAttribute(R.attr.disabled, context),
            disableInSecondaryState = true,
            longClickListener = { onItemTapped.invoke(ToolbarMenu.Item.Back(viewHistory = true)) }
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.Back(viewHistory = false))
        }

        val forward = BrowserMenuItemToolbar.TwoStateButton(
            primaryImageResource = mozilla.components.ui.icons.R.drawable.mozac_ic_forward,
            primaryContentDescription = context.getString(R.string.browser_menu_forward),
            primaryImageTintResource = primaryTextColor(),
            isInPrimaryState = {
                selectedSession?.content?.canGoForward ?: true
            },
            secondaryImageTintResource = ThemeManager.resolveAttribute(R.attr.disabled, context),
            disableInSecondaryState = true,
            longClickListener = { onItemTapped.invoke(ToolbarMenu.Item.Forward(viewHistory = true)) }
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.Forward(viewHistory = false))
        }

        val refresh = BrowserMenuItemToolbar.TwoStateButton(
            primaryImageResource = mozilla.components.ui.icons.R.drawable.mozac_ic_refresh,
            primaryContentDescription = context.getString(R.string.browser_menu_refresh),
            primaryImageTintResource = primaryTextColor(),
            isInPrimaryState = {
                selectedSession?.content?.loading == false
            },
            secondaryImageResource = mozilla.components.ui.icons.R.drawable.mozac_ic_stop,
            secondaryContentDescription = context.getString(R.string.browser_menu_stop),
            secondaryImageTintResource = primaryTextColor(),
            disableInSecondaryState = false,
            longClickListener = { onItemTapped.invoke(ToolbarMenu.Item.Reload(bypassCache = true)) }
        ) {
            if (selectedSession?.content?.loading == true) {
                onItemTapped.invoke(ToolbarMenu.Item.Stop)
            } else {
                onItemTapped.invoke(ToolbarMenu.Item.Reload(bypassCache = false))
            }
        }

        val share = BrowserMenuItemToolbar.Button(
            imageResource = R.drawable.ic_share_filled,
            contentDescription = context.getString(R.string.browser_menu_share),
            iconTintColorResource = primaryTextColor(),
            listener = {
                onItemTapped.invoke(ToolbarMenu.Item.Share)
            }
        )

        registerForIsBookmarkedUpdates()

        val bookmark = BrowserMenuItemToolbar.TwoStateButton(
            primaryImageResource = R.drawable.ic_bookmark_filled,
            primaryContentDescription = context.getString(R.string.browser_menu_edit_bookmark),
            primaryImageTintResource = primaryTextColor(),
            // TwoStateButton.isInPrimaryState must be synchronous, and checking bookmark state is
            // relatively slow. The best we can do here is periodically compute and cache a new "is
            // bookmarked" state, and use that whenever the menu has been opened.
            isInPrimaryState = { currentUrlIsBookmarked },
            secondaryImageResource = R.drawable.ic_bookmark_outline,
            secondaryContentDescription = context.getString(R.string.browser_menu_bookmark),
            secondaryImageTintResource = primaryTextColor(),
            disableInSecondaryState = false
        ) {
            if (!currentUrlIsBookmarked) currentUrlIsBookmarked = true
            onItemTapped.invoke(ToolbarMenu.Item.Bookmark)
        }

        BrowserMenuItemToolbar(listOf(back, forward, bookmark, share, refresh))
    }

    // Predicates that need to be repeatedly called as the session changes
    private fun canAddToHomescreen(): Boolean =
        selectedSession != null && isPinningSupported &&
                !context.components.useCases.webAppUseCases.isInstallable()

    private fun canInstall(): Boolean =
        selectedSession != null && isPinningSupported &&
                context.components.useCases.webAppUseCases.isInstallable()

    private fun shouldShowOpenInApp(): Boolean = selectedSession?.let { session ->
        val appLink = context.components.useCases.appLinksUseCases.appLinkRedirect
        appLink(session.content.url).hasExternalApp()
    } ?: false

    private fun shouldShowReaderAppearance(): Boolean = selectedSession?.let {
        store.state.findTab(it.id)?.readerState?.active
    } ?: false
    // End of predicates //

    private val oldCoreMenuItems by lazy {
        val settings = BrowserMenuHighlightableItem(
            label = context.getString(R.string.browser_menu_settings),
            startImageResource = R.drawable.ic_settings,
            iconTintColorResource = if (hasAccountProblem)
                ThemeManager.resolveAttribute(R.attr.syncDisconnected, context) else
                primaryTextColor(),
            textColorResource = if (hasAccountProblem)
                ThemeManager.resolveAttribute(R.attr.primaryText, context) else
                primaryTextColor(),
            highlight = BrowserMenuHighlight.HighPriority(
                endImageResource = R.drawable.ic_sync_disconnected,
                backgroundTint = context.getColorFromAttr(R.attr.syncDisconnectedBackground),
                canPropagate = false
            ),
            isHighlighted = { hasAccountProblem }
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.Settings)
        }

        val desktopMode = BrowserMenuImageSwitch(
            imageResource = R.drawable.ic_desktop,
            label = context.getString(R.string.browser_menu_desktop_site),
            initialState = {
                selectedSession?.content?.desktopMode ?: false
            }
        ) { checked ->
            onItemTapped.invoke(ToolbarMenu.Item.RequestDesktop(checked))
        }

        val addToTopSites = BrowserMenuImageText(
            label = context.getString(R.string.browser_menu_add_to_top_sites),
            imageResource = R.drawable.ic_top_sites,
            iconTintColorResource = primaryTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.AddToTopSites)
        }

        val addToHomescreen = BrowserMenuImageText(
            label = context.getString(R.string.browser_menu_add_to_homescreen),
            imageResource = R.drawable.ic_add_to_homescreen,
            iconTintColorResource = primaryTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.AddToHomeScreen)
        }

        val syncedTabs = BrowserMenuImageText(
            label = context.getString(R.string.synced_tabs),
            imageResource = R.drawable.ic_synced_tabs,
            iconTintColorResource = primaryTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.SyncedTabs)
        }

        val installToHomescreen = BrowserMenuHighlightableItem(
            label = context.getString(R.string.browser_menu_install_on_homescreen),
            startImageResource = R.drawable.ic_add_to_homescreen,
            iconTintColorResource = primaryTextColor(),
            highlight = BrowserMenuHighlight.LowPriority(
                label = context.getString(R.string.browser_menu_install_on_homescreen),
                notificationTint = getColor(context, R.color.whats_new_notification_color)
            ),
            isHighlighted = {
                !context.settings().installPwaOpened
            }
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.InstallToHomeScreen)
        }

        val findInPage = BrowserMenuImageText(
            label = context.getString(R.string.browser_menu_find_in_page),
            imageResource = R.drawable.mozac_ic_search,
            iconTintColorResource = primaryTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.FindInPage)
        }

        val reportSiteIssuePlaceholder = WebExtensionPlaceholderMenuItem(
            id = WebCompatReporterFeature.WEBCOMPAT_REPORTER_EXTENSION_ID
        )

        val saveToCollection = BrowserMenuImageText(
            label = context.getString(R.string.browser_menu_save_to_collection_2),
            imageResource = R.drawable.ic_tab_collection,
            iconTintColorResource = primaryTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.SaveToCollection)
        }

        val deleteDataOnQuit = BrowserMenuImageText(
            label = context.getString(R.string.delete_browsing_data_on_quit_action),
            imageResource = R.drawable.ic_exit,
            iconTintColorResource = primaryTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.Quit)
        }

        val readerAppearance = BrowserMenuImageText(
            label = context.getString(R.string.browser_menu_read_appearance),
            imageResource = R.drawable.ic_readermode_appearance,
            iconTintColorResource = primaryTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.ReaderModeAppearance)
        }

        val openInApp = BrowserMenuHighlightableItem(
            label = context.getString(R.string.browser_menu_open_app_link),
            startImageResource = R.drawable.ic_open_in_app,
            iconTintColorResource = primaryTextColor(),
            highlight = BrowserMenuHighlight.LowPriority(
                label = context.getString(R.string.browser_menu_open_app_link),
                notificationTint = getColor(context, R.color.whats_new_notification_color)
            ),
            isHighlighted = { !context.settings().openInAppOpened }
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.OpenInApp)
        }

        val historyItem = BrowserMenuImageText(
            context.getString(R.string.library_history),
            R.drawable.ic_history,
            primaryTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.History)
        }

        val bookmarksItem = BrowserMenuImageText(
            context.getString(R.string.library_bookmarks),
            R.drawable.ic_bookmark_filled,
            primaryTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.Bookmarks)
        }

        val downloadsItem = BrowserMenuImageText(
            context.getString(R.string.library_downloads),
            R.drawable.ic_download,
            primaryTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.Downloads)
        }

        // Predicates that are called once, during screen init
        val shouldShowSaveToCollection = (context.asActivity() as? HomeActivity)
            ?.browsingModeManager?.mode == BrowsingMode.Normal
        val shouldDeleteDataOnQuit = context.components.settings
            .shouldDeleteBrowsingDataOnQuit

        val menuItems = listOfNotNull(
            downloadsItem,
            historyItem,
            bookmarksItem,
            syncedTabs,
            settings,
            if (shouldDeleteDataOnQuit) deleteDataOnQuit else null,
            BrowserMenuDivider(),
            reportSiteIssuePlaceholder,
            findInPage,
            addToTopSites,
            addToHomescreen.apply { visible = ::canAddToHomescreen },
            installToHomescreen.apply { visible = ::canInstall },
            if (shouldShowSaveToCollection) saveToCollection else null,
            desktopMode,
            openInApp.apply { visible = ::shouldShowOpenInApp },
            readerAppearance.apply { visible = ::shouldShowReaderAppearance },
            BrowserMenuDivider(),
            menuToolbar
        )

        if (shouldReverseItems) {
            menuItems.reversed()
        } else {
            menuItems
        }
    }

    private val newCoreMenuItems by lazy {
        val newTabItem = BrowserMenuImageText(
            context.getString(R.string.library_new_tab),
            R.drawable.ic_bookmark_filled,
            disabledTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.NewTab)
        }

        val bookmarksItem = BrowserMenuImageText(
            context.getString(R.string.library_bookmarks),
            R.drawable.ic_bookmark_filled,
            disabledTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.Bookmarks)
        }

        val historyItem = BrowserMenuImageText(
            context.getString(R.string.library_history),
            R.drawable.ic_history,
            disabledTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.History)
        }

        val downloadsItem = BrowserMenuImageText(
            context.getString(R.string.library_downloads),
            R.drawable.ic_download,
            disabledTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.Downloads)
        }

        val extensionsItem = BrowserMenuImageText(
            context.getString(R.string.browser_menu_extensions),
            R.drawable.ic_addons_extensions,
            disabledTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.AddonsManager)
        }

        val syncedTabsItem = BrowserMenuImageText(
            context.getString(R.string.library_synced_tabs),
            R.drawable.ic_synced_tabs,
            disabledTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.SyncedTabs)
        }

        val findInPageItem = BrowserMenuImageText(
            label = context.getString(R.string.browser_menu_find_in_page),
            imageResource = R.drawable.mozac_ic_search,
            iconTintColorResource = disabledTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.FindInPage)
        }

        val desktopSiteItem = BrowserMenuImageSwitch(
            imageResource = R.drawable.ic_desktop,
            label = context.getString(R.string.browser_menu_desktop_site),
            initialState = {
                selectedSession?.content?.desktopMode ?: false
            }
        ) { checked ->
            onItemTapped.invoke(ToolbarMenu.Item.RequestDesktop(checked))
        }

        val addToHomeScreenItem = BrowserMenuImageText(
            label = context.getString(R.string.browser_menu_add_to_homescreen),
            imageResource = R.drawable.ic_add_to_homescreen,
            iconTintColorResource = disabledTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.AddToHomeScreen)
        }

        val addToTopSitesItem = BrowserMenuImageText(
            label = context.getString(R.string.browser_menu_add_to_top_sites),
            imageResource = R.drawable.ic_top_sites,
            iconTintColorResource = disabledTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.AddToTopSites)
        }

        val saveToCollectionItem = BrowserMenuImageText(
            label = context.getString(R.string.browser_menu_save_to_collection_2),
            imageResource = R.drawable.ic_tab_collection,
            iconTintColorResource = disabledTextColor()
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.SaveToCollection)
        }

        val settingsItem = BrowserMenuHighlightableItem(
            label = context.getString(R.string.browser_menu_settings),
            startImageResource = R.drawable.ic_settings,
            iconTintColorResource = disabledTextColor(),
            textColorResource = if (hasAccountProblem)
                ThemeManager.resolveAttribute(R.attr.primaryText, context) else
                primaryTextColor(),
            highlight = BrowserMenuHighlight.HighPriority(
                endImageResource = R.drawable.ic_sync_disconnected,
                backgroundTint = context.getColorFromAttr(R.attr.syncDisconnectedBackground),
                canPropagate = false
            ),
            isHighlighted = { hasAccountProblem }
        ) {
            onItemTapped.invoke(ToolbarMenu.Item.Settings)
        }

        val menuItems = listOfNotNull(
            newTabItem,
            BrowserMenuDivider(),
            bookmarksItem,
            historyItem,
            downloadsItem,
            extensionsItem,
            syncedTabsItem,
            BrowserMenuDivider(),
            findInPageItem,
            desktopSiteItem,
            BrowserMenuDivider(),
            addToHomeScreenItem.apply { visible = ::canAddToHomescreen },
            addToTopSitesItem,
            saveToCollectionItem,
            BrowserMenuDivider(),
            settingsItem,
            BrowserMenuDivider(),
            menuToolbar
        )

        menuItems
    }

    @ColorRes
    @VisibleForTesting
    internal fun primaryTextColor() = ThemeManager.resolveAttribute(R.attr.primaryText, context)

    @ColorRes
    @VisibleForTesting
    internal fun disabledTextColor() = R.color.toolbar_menu_transparent

    @VisibleForTesting
    internal fun registerForIsBookmarkedUpdates() {
        store.flowScoped(lifecycleOwner) { flow ->
            flow.mapNotNull { state -> state.selectedTab }
                .ifAnyChanged { tab ->
                    arrayOf(
                        tab.id,
                        tab.content.url
                    )
                }
                .collect {
                    currentUrlIsBookmarked = false
                    updateCurrentUrlIsBookmarked(it.content.url)
                }
        }
    }

    @VisibleForTesting
    internal fun updateCurrentUrlIsBookmarked(newUrl: String) {
        isBookmarkedJob?.cancel()
        isBookmarkedJob = lifecycleOwner.lifecycleScope.launch {
            currentUrlIsBookmarked = bookmarksStorage
                .getBookmarksWithUrl(newUrl)
                .any { it.url == newUrl }
        }
    }
}