/* 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.home.sessioncontrol

import androidx.navigation.NavController
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import mozilla.components.browser.session.SessionManager
import mozilla.components.concept.engine.Engine
import mozilla.components.concept.engine.prompt.ShareData
import mozilla.components.feature.tab.collections.TabCollection
import mozilla.components.feature.tab.collections.ext.restore
import mozilla.components.feature.tabs.TabsUseCases
import mozilla.components.feature.top.sites.TopSite
import mozilla.components.support.ktx.kotlin.isUrl
import org.mozilla.fenix.BrowserDirection
import org.mozilla.fenix.HomeActivity
import org.mozilla.fenix.R
import org.mozilla.fenix.browser.browsingmode.BrowsingMode
import org.mozilla.fenix.collections.SaveCollectionStep
import org.mozilla.fenix.components.TabCollectionStorage
import org.mozilla.fenix.components.TopSiteStorage
import org.mozilla.fenix.components.metrics.Event
import org.mozilla.fenix.components.metrics.MetricController
import org.mozilla.fenix.components.metrics.MetricsUtils
import org.mozilla.fenix.components.tips.Tip
import org.mozilla.fenix.ext.components
import org.mozilla.fenix.ext.metrics
import org.mozilla.fenix.ext.nav
import org.mozilla.fenix.ext.sessionsOfType
import org.mozilla.fenix.ext.settings
import org.mozilla.fenix.home.HomeFragment
import org.mozilla.fenix.home.HomeFragmentAction
import org.mozilla.fenix.home.HomeFragmentDirections
import org.mozilla.fenix.home.HomeFragmentStore
import org.mozilla.fenix.settings.SupportUtils
import org.mozilla.fenix.utils.Settings
import mozilla.components.feature.tab.collections.Tab as ComponentTab

/**
 * [HomeFragment] controller. An interface that handles the view manipulation of the Tabs triggered
 * by the Interactor.
 */
@Suppress("TooManyFunctions")
interface SessionControlController {
    /**
     * @see [CollectionInteractor.onCollectionAddTabTapped]
     */
    fun handleCollectionAddTabTapped(collection: TabCollection)

    /**
     * @see [CollectionInteractor.onCollectionOpenTabClicked]
     */
    fun handleCollectionOpenTabClicked(tab: ComponentTab)

    /**
     * @see [CollectionInteractor.onCollectionOpenTabsTapped]
     */
    fun handleCollectionOpenTabsTapped(collection: TabCollection)

    /**
     * @see [CollectionInteractor.onCollectionRemoveTab]
     */
    fun handleCollectionRemoveTab(collection: TabCollection, tab: ComponentTab, wasSwiped: Boolean)

    /**
     * @see [CollectionInteractor.onCollectionShareTabsClicked]
     */
    fun handleCollectionShareTabsClicked(collection: TabCollection)

    /**
     * @see [CollectionInteractor.onDeleteCollectionTapped]
     */
    fun handleDeleteCollectionTapped(collection: TabCollection)

    /**
     * @see [TopSiteInteractor.onOpenInPrivateTabClicked]
     */
    fun handleOpenInPrivateTabClicked(topSite: TopSite)

    /**
     * @see [TabSessionInteractor.onPrivateBrowsingLearnMoreClicked]
     */
    fun handlePrivateBrowsingLearnMoreClicked()

    /**
     * @see [TopSiteInteractor.onRemoveTopSiteClicked]
     */
    fun handleRemoveTopSiteClicked(topSite: TopSite)

    /**
     * @see [CollectionInteractor.onRenameCollectionTapped]
     */
    fun handleRenameCollectionTapped(collection: TabCollection)

    /**
     * @see [TopSiteInteractor.onSelectTopSite]
     */
    fun handleSelectTopSite(url: String, isDefault: Boolean)

    /**
     * @see [OnboardingInteractor.onStartBrowsingClicked]
     */
    fun handleStartBrowsingClicked()

    /**
     * @see [OnboardingInteractor.onOpenSettingsClicked]
     */
    fun handleOpenSettingsClicked()

    /**
     * @see [OnboardingInteractor.onWhatsNewGetAnswersClicked]
     */
    fun handleWhatsNewGetAnswersClicked()

    /**
     * @see [OnboardingInteractor.onReadPrivacyNoticeClicked]
     */
    fun handleReadPrivacyNoticeClicked()

    /**
     * @see [CollectionInteractor.onToggleCollectionExpanded]
     */
    fun handleToggleCollectionExpanded(collection: TabCollection, expand: Boolean)

    /**
     * @see [TipInteractor.onCloseTip]
     */
    fun handleCloseTip(tip: Tip)

    /**
     * @see [ToolbarInteractor.onPasteAndGo]
     */
    fun handlePasteAndGo(clipboardText: String)

    /**
     * @see [ToolbarInteractor.onPaste]
     */
    fun handlePaste(clipboardText: String)

    /**
     * @see [CollectionInteractor.onAddTabsToCollectionTapped]
     */
    fun handleCreateCollection()

    /**
     * @see [CollectionInteractor.onRemoveCollectionsPlaceholder]
     */
    fun handleRemoveCollectionsPlaceholder()
}

@Suppress("TooManyFunctions", "LargeClass")
class DefaultSessionControlController(
    private val activity: HomeActivity,
    private val settings: Settings,
    private val engine: Engine,
    private val metrics: MetricController,
    private val sessionManager: SessionManager,
    private val tabCollectionStorage: TabCollectionStorage,
    private val topSiteStorage: TopSiteStorage,
    private val addTabUseCase: TabsUseCases.AddNewTabUseCase,
    private val fragmentStore: HomeFragmentStore,
    private val navController: NavController,
    private val viewLifecycleScope: CoroutineScope,
    private val hideOnboarding: () -> Unit,
    private val registerCollectionStorageObserver: () -> Unit,
    private val showDeleteCollectionPrompt: (
        tabCollection: TabCollection,
        title: String?,
        message: String,
        wasSwiped: Boolean,
        handleSwipedItemDeletionCancel: () -> Unit
    ) -> Unit,
    private val showTabTray: () -> Unit,
    private val handleSwipedItemDeletionCancel: () -> Unit
) : SessionControlController {

    override fun handleCollectionAddTabTapped(collection: TabCollection) {
        metrics.track(Event.CollectionAddTabPressed)
        showCollectionCreationFragment(
            step = SaveCollectionStep.SelectTabs,
            selectedTabCollectionId = collection.id
        )
    }

    override fun handleCollectionOpenTabClicked(tab: ComponentTab) {
        sessionManager.restore(
            activity,
            engine,
            tab,
            onTabRestored = {
                activity.openToBrowser(BrowserDirection.FromHome)
            },
            onFailure = {
                activity.openToBrowserAndLoad(
                    searchTermOrURL = tab.url,
                    newTab = true,
                    from = BrowserDirection.FromHome
                )
            }
        )

        metrics.track(Event.CollectionTabRestored)
    }

    override fun handleCollectionOpenTabsTapped(collection: TabCollection) {
        sessionManager.restore(
            activity,
            engine,
            collection,
            onFailure = { url ->
                addTabUseCase.invoke(url)
            }
        )

        showTabTray()
        metrics.track(Event.CollectionAllTabsRestored)
    }

    override fun handleCollectionRemoveTab(
        collection: TabCollection,
        tab: ComponentTab,
        wasSwiped: Boolean
    ) {
        metrics.track(Event.CollectionTabRemoved)

        if (collection.tabs.size == 1) {
            val title = activity.resources.getString(
                R.string.delete_tab_and_collection_dialog_title,
                collection.title
            )
            val message =
                activity.resources.getString(R.string.delete_tab_and_collection_dialog_message)
            showDeleteCollectionPrompt(
                collection,
                title,
                message,
                wasSwiped,
                handleSwipedItemDeletionCancel
            )
        } else {
            viewLifecycleScope.launch(Dispatchers.IO) {
                tabCollectionStorage.removeTabFromCollection(collection, tab)
            }
        }
    }

    override fun handleCollectionShareTabsClicked(collection: TabCollection) {
        showShareFragment(
            collection.title,
            collection.tabs.map { ShareData(url = it.url, title = it.title) }
        )
        metrics.track(Event.CollectionShared)
    }

    override fun handleDeleteCollectionTapped(collection: TabCollection) {
        val message =
            activity.resources.getString(R.string.tab_collection_dialog_message, collection.title)
        showDeleteCollectionPrompt(collection, null, message, false, handleSwipedItemDeletionCancel)
    }

    override fun handleOpenInPrivateTabClicked(topSite: TopSite) {
        metrics.track(Event.TopSiteOpenInPrivateTab)
        with(activity) {
            browsingModeManager.mode = BrowsingMode.Private
            openToBrowserAndLoad(
                searchTermOrURL = topSite.url,
                newTab = true,
                from = BrowserDirection.FromHome
            )
        }
    }

    override fun handlePrivateBrowsingLearnMoreClicked() {
        activity.openToBrowserAndLoad(
            searchTermOrURL = SupportUtils.getGenericSumoURLForTopic
                (SupportUtils.SumoTopic.PRIVATE_BROWSING_MYTHS),
            newTab = true,
            from = BrowserDirection.FromHome
        )
    }

    override fun handleRemoveTopSiteClicked(topSite: TopSite) {
        metrics.track(Event.TopSiteRemoved)
        if (topSite.url == SupportUtils.POCKET_TRENDING_URL) {
            metrics.track(Event.PocketTopSiteRemoved)
        }

        viewLifecycleScope.launch(Dispatchers.IO) {
            topSiteStorage.removeTopSite(topSite)
        }
    }

    override fun handleRenameCollectionTapped(collection: TabCollection) {
        showCollectionCreationFragment(
            step = SaveCollectionStep.RenameCollection,
            selectedTabCollectionId = collection.id
        )
        metrics.track(Event.CollectionRenamePressed)
    }

    override fun handleSelectTopSite(url: String, isDefault: Boolean) {
        metrics.track(Event.TopSiteOpenInNewTab)
        if (isDefault) {
            metrics.track(Event.TopSiteOpenDefault)
        }
        if (url == SupportUtils.POCKET_TRENDING_URL) {
            metrics.track(Event.PocketTopSiteClicked)
        }
        addTabUseCase.invoke(
            url = url,
            selectTab = true,
            startLoading = true
        )
        activity.openToBrowser(BrowserDirection.FromHome)
    }

    override fun handleStartBrowsingClicked() {
        hideOnboarding()
    }

    override fun handleOpenSettingsClicked() {
        val directions = HomeFragmentDirections.actionGlobalPrivateBrowsingFragment()
        navController.nav(R.id.homeFragment, directions)
    }

    override fun handleWhatsNewGetAnswersClicked() {
        activity.openToBrowserAndLoad(
            searchTermOrURL = SupportUtils.getWhatsNewUrl(activity),
            newTab = true,
            from = BrowserDirection.FromHome
        )
    }

    override fun handleReadPrivacyNoticeClicked() {
        activity.openToBrowserAndLoad(
            searchTermOrURL = SupportUtils.getMozillaPageUrl(SupportUtils.MozillaPage.PRIVATE_NOTICE),
            newTab = true,
            from = BrowserDirection.FromHome
        )
    }

    override fun handleToggleCollectionExpanded(collection: TabCollection, expand: Boolean) {
        fragmentStore.dispatch(HomeFragmentAction.CollectionExpanded(collection, expand))
    }

    override fun handleCloseTip(tip: Tip) {
        fragmentStore.dispatch(HomeFragmentAction.RemoveTip(tip))
    }

    private fun showTabTrayCollectionCreation() {
        val directions = HomeFragmentDirections.actionGlobalTabTrayDialogFragment(
            enterMultiselect = true
        )
        navController.nav(R.id.homeFragment, directions)
    }

    private fun showCollectionCreationFragment(
        step: SaveCollectionStep,
        selectedTabIds: Array<String>? = null,
        selectedTabCollectionId: Long? = null
    ) {
        if (navController.currentDestination?.id == R.id.collectionCreationFragment) return

        // Only register the observer right before moving to collection creation
        registerCollectionStorageObserver()

        val tabIds = sessionManager
            .sessionsOfType(private = activity.browsingModeManager.mode.isPrivate)
            .map { session -> session.id }
            .toList()
            .toTypedArray()
        val directions = HomeFragmentDirections.actionGlobalCollectionCreationFragment(
            tabIds = tabIds,
            saveCollectionStep = step,
            selectedTabIds = selectedTabIds,
            selectedTabCollectionId = selectedTabCollectionId ?: -1
        )
        navController.nav(R.id.homeFragment, directions)
    }

    override fun handleCreateCollection() {
        showTabTrayCollectionCreation()
    }

    override fun handleRemoveCollectionsPlaceholder() {
        settings.showCollectionsPlaceholderOnHome = false
        fragmentStore.dispatch(HomeFragmentAction.RemoveCollectionsPlaceholder)
    }

    private fun showShareFragment(shareSubject: String, data: List<ShareData>) {
        val directions = HomeFragmentDirections.actionGlobalShareFragment(
            shareSubject = shareSubject,
            data = data.toTypedArray()
        )
        navController.nav(R.id.homeFragment, directions)
    }

    override fun handlePasteAndGo(clipboardText: String) {
        activity.openToBrowserAndLoad(
            searchTermOrURL = clipboardText,
            newTab = true,
            from = BrowserDirection.FromHome,
            engine = activity.components.search.provider.getDefaultEngine(activity)
        )

        val event = if (clipboardText.isUrl()) {
            Event.EnteredUrl(false)
        } else {
            val searchAccessPoint = Event.PerformedSearch.SearchAccessPoint.ACTION
            activity.settings().incrementActiveSearchCount()
            searchAccessPoint.let { sap ->
                MetricsUtils.createSearchEvent(
                    activity.components.search.provider.getDefaultEngine(activity),
                    activity,
                    sap
                )
            }
        }

        event?.let { activity.metrics.track(it) }
    }

    override fun handlePaste(clipboardText: String) {
        val directions = HomeFragmentDirections.actionGlobalSearch(
            sessionId = null,
            pastedText = clipboardText
        )
        navController.nav(R.id.homeFragment, directions)
    }
}