/* 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 android.view.LayoutInflater
import android.widget.EditText
import androidx.annotation.VisibleForTesting
import androidx.appcompat.app.AlertDialog
import androidx.navigation.NavController
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import mozilla.components.browser.state.selector.getNormalOrPrivateTabs
import mozilla.components.browser.state.state.availableSearchEngines
import mozilla.components.browser.state.state.searchEngines
import mozilla.components.browser.state.state.selectedOrDefaultSearchEngine
import mozilla.components.browser.state.store.BrowserStore
import mozilla.components.concept.engine.Engine
import mozilla.components.concept.engine.prompt.ShareData
import mozilla.components.feature.session.SessionUseCases
import mozilla.components.feature.tab.collections.TabCollection
import mozilla.components.feature.tab.collections.ext.invoke
import mozilla.components.feature.tabs.TabsUseCases
import mozilla.components.feature.top.sites.TopSite
import mozilla.components.support.ktx.android.view.showKeyboard
import mozilla.components.support.ktx.kotlin.isUrl
import org.mozilla.fenix.BrowserDirection
import org.mozilla.fenix.FeatureFlags
import org.mozilla.fenix.HomeActivity
import org.mozilla.fenix.R
import org.mozilla.fenix.browser.BrowserFragmentDirections
import org.mozilla.fenix.browser.browsingmode.BrowsingMode
import org.mozilla.fenix.collections.SaveCollectionStep
import org.mozilla.fenix.components.TabCollectionStorage
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.openSetDefaultBrowserOption
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.HomeFragmentState
import org.mozilla.fenix.home.HomeFragmentStore
import org.mozilla.fenix.home.Mode
import org.mozilla.fenix.settings.SupportUtils
import org.mozilla.fenix.settings.SupportUtils.SumoTopic.PRIVATE_BROWSING_MYTHS
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.onRenameTopSiteClicked]
     */
    fun handleRenameTopSiteClicked(topSite: TopSite)

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

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

    /**
     * @see [TopSiteInteractor.onSelectTopSite]
     */
    fun handleSelectTopSite(url: String, type: TopSite.Type)

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

    /**
     * @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()

    /**
     * @see [CollectionInteractor.onCollectionMenuOpened] and [TopSiteInteractor.onTopSiteMenuOpened]
     */
    fun handleMenuOpened()

    /**
     * @see [ExperimentCardInteractor.onSetDefaultBrowserClicked]
     */
    fun handleSetDefaultBrowser()

    /**
     * @see [ExperimentCardInteractor.onCloseExperimentCardClicked]
     */
    fun handleCloseExperimentCard()

    /**
     * @see [TabSessionInteractor.onPrivateModeButtonClicked]
     */
    fun handlePrivateModeButtonClicked(newMode: BrowsingMode, userHasBeenOnboarded: Boolean)

    /**
     * @see [CustomizeHomeIteractor.openCustomizeHomePage]
     */
    fun handleCustomizeHomeTapped()

    /**
     * @see [OnboardingInteractor.showOnboardingDialog]
     */
    fun handleShowOnboardingDialog()

    /**
     * @see [SessionControlInteractor.reportSessionMetrics]
     */
    fun handleReportSessionMetrics(state: HomeFragmentState)
}

@Suppress("TooManyFunctions", "LargeClass")
class DefaultSessionControlController(
    private val activity: HomeActivity,
    private val settings: Settings,
    private val engine: Engine,
    private val metrics: MetricController,
    private val store: BrowserStore,
    private val tabCollectionStorage: TabCollectionStorage,
    private val addTabUseCase: TabsUseCases.AddNewTabUseCase,
    private val restoreUseCase: TabsUseCases.RestoreUseCase,
    private val reloadUrlUseCase: SessionUseCases.ReloadUrlUseCase,
    private val selectTabUseCase: TabsUseCases.SelectTabUseCase,
    private val fragmentStore: HomeFragmentStore,
    private val navController: NavController,
    private val viewLifecycleScope: CoroutineScope,
    private val hideOnboarding: () -> Unit,
    private val registerCollectionStorageObserver: () -> Unit,
    private val removeCollectionWithUndo: (tabCollection: TabCollection) -> Unit,
    private val showTabTray: () -> Unit
) : SessionControlController {

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

    override fun handleMenuOpened() {
        dismissSearchDialogIfDisplayed()
    }

    override fun handleCollectionOpenTabClicked(tab: ComponentTab) {
        dismissSearchDialogIfDisplayed()

        restoreUseCase.invoke(
            activity,
            engine,
            tab,
            onTabRestored = {
                activity.openToBrowser(BrowserDirection.FromHome)
                selectTabUseCase.invoke(it)
                reloadUrlUseCase.invoke(it)
            },
            onFailure = {
                activity.openToBrowserAndLoad(
                    searchTermOrURL = tab.url,
                    newTab = true,
                    from = BrowserDirection.FromHome
                )
            }
        )

        metrics.track(Event.CollectionTabRestored)
    }

    override fun handleCollectionOpenTabsTapped(collection: TabCollection) {
        restoreUseCase.invoke(
            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) {
            removeCollectionWithUndo(collection)
        } else {
            viewLifecycleScope.launch {
                tabCollectionStorage.removeTabFromCollection(collection, tab)
            }
        }
    }

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

    override fun handleDeleteCollectionTapped(collection: TabCollection) {
        removeCollectionWithUndo(collection)
    }

    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() {
        dismissSearchDialogIfDisplayed()
        activity.openToBrowserAndLoad(
            searchTermOrURL = SupportUtils.getGenericSumoURLForTopic(PRIVATE_BROWSING_MYTHS),
            newTab = true,
            from = BrowserDirection.FromHome
        )
    }

    override fun handleRenameTopSiteClicked(topSite: TopSite) {
        activity.let {
            val customLayout =
                LayoutInflater.from(it).inflate(R.layout.top_sites_rename_dialog, null)
            val topSiteLabelEditText: EditText =
                customLayout.findViewById(R.id.top_site_title)
            topSiteLabelEditText.setText(topSite.title)

            AlertDialog.Builder(it).apply {
                setTitle(R.string.rename_top_site)
                setView(customLayout)
                setPositiveButton(R.string.top_sites_rename_dialog_ok) { dialog, _ ->
                    viewLifecycleScope.launch(Dispatchers.IO) {
                        with(activity.components.useCases.topSitesUseCase) {
                            updateTopSites(
                                topSite,
                                topSiteLabelEditText.text.toString(),
                                topSite.url
                            )
                        }
                    }
                    dialog.dismiss()
                }
                setNegativeButton(R.string.top_sites_rename_dialog_cancel) { dialog, _ ->
                    dialog.cancel()
                }
            }.show().also {
                topSiteLabelEditText.setSelection(0, topSiteLabelEditText.text.length)
                topSiteLabelEditText.showKeyboard()
            }
        }
    }

    override fun handleRemoveTopSiteClicked(topSite: TopSite) {
        metrics.track(Event.TopSiteRemoved)
        when (topSite.url) {
            SupportUtils.POCKET_TRENDING_URL -> metrics.track(Event.PocketTopSiteRemoved)
            SupportUtils.GOOGLE_URL -> metrics.track(Event.GoogleTopSiteRemoved)
            SupportUtils.BAIDU_URL -> metrics.track(Event.BaiduTopSiteRemoved)
        }

        viewLifecycleScope.launch(Dispatchers.IO) {
            with(activity.components.useCases.topSitesUseCase) {
                removeTopSites(topSite)
            }
        }
    }

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

    override fun handleSelectTopSite(url: String, type: TopSite.Type) {
        dismissSearchDialogIfDisplayed()

        metrics.track(Event.TopSiteOpenInNewTab)

        when (type) {
            TopSite.Type.DEFAULT -> metrics.track(Event.TopSiteOpenDefault)
            TopSite.Type.FRECENT -> metrics.track(Event.TopSiteOpenFrecent)
            TopSite.Type.PINNED -> metrics.track(Event.TopSiteOpenPinned)
        }

        if (url == SupportUtils.GOOGLE_URL) {
            metrics.track(Event.TopSiteOpenGoogle)
        }

        if (url == SupportUtils.BAIDU_URL) {
            metrics.track(Event.TopSiteOpenBaidu)
        }

        if (url == SupportUtils.POCKET_TRENDING_URL) {
            metrics.track(Event.PocketTopSiteClicked)
        }

        val availableEngines = getAvailableSearchEngines()

        val searchAccessPoint = Event.PerformedSearch.SearchAccessPoint.TOPSITE
        val event =
            availableEngines.firstOrNull {
                engine ->
                engine.resultUrls.firstOrNull { it.contains(url) } != null
            }?.let {
                searchEngine ->
                searchAccessPoint.let { sap ->
                    MetricsUtils.createSearchEvent(searchEngine, store, sap)
                }
            }
        event?.let { activity.metrics.track(it) }

        val tabId = addTabUseCase.invoke(
            url = appendSearchAttributionToUrlIfNeeded(url),
            selectTab = true,
            startLoading = true
        )

        if (settings.openNextTabInDesktopMode) {
            activity.handleRequestDesktopMode(tabId)
        }
        activity.openToBrowser(BrowserDirection.FromHome)
    }

    @VisibleForTesting
    internal fun getAvailableSearchEngines() =
        activity.components.core.store.state.search.searchEngines +
            activity.components.core.store.state.search.availableSearchEngines

    /**
     * Append a search attribution query to any provided search engine URL based on the
     * user's current region.
     */
    private fun appendSearchAttributionToUrlIfNeeded(url: String): String {
        if (url == SupportUtils.GOOGLE_URL) {
            store.state.search.region?.let { region ->
                return when (region.current) {
                    "US" -> SupportUtils.GOOGLE_US_URL
                    else -> SupportUtils.GOOGLE_XX_URL
                }
            }
        }

        return url
    }

    private fun dismissSearchDialogIfDisplayed() {
        if (navController.currentDestination?.id == R.id.searchDialogFragment) {
            navController.navigateUp()
        }
    }

    override fun handleStartBrowsingClicked() {
        hideOnboarding()
    }

    override fun handleCustomizeHomeTapped() {
        val directions = HomeFragmentDirections.actionGlobalHomeSettingsFragment()
        navController.nav(R.id.homeFragment, directions)
        metrics.track(Event.HomeScreenCustomizedHomeClicked)
    }

    override fun handleShowOnboardingDialog() {
        if (FeatureFlags.showHomeOnboarding) {
            navController.nav(
                R.id.homeFragment,
                HomeFragmentDirections.actionGlobalHomeOnboardingDialog()
            )
        }
    }

    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.actionGlobalTabsTrayFragment(
            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 = store.state
            .getNormalOrPrivateTabs(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) {
        val searchEngine = store.state.search.selectedOrDefaultSearchEngine

        activity.openToBrowserAndLoad(
            searchTermOrURL = clipboardText,
            newTab = true,
            from = BrowserDirection.FromHome,
            engine = searchEngine
        )

        val event = if (clipboardText.isUrl() || searchEngine == null) {
            Event.EnteredUrl(false)
        } else {
            val searchAccessPoint = Event.PerformedSearch.SearchAccessPoint.ACTION
            searchAccessPoint.let { sap ->
                MetricsUtils.createSearchEvent(
                    searchEngine,
                    store,
                    sap
                )
            }
        }

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

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

    override fun handleSetDefaultBrowser() {
        settings.userDismissedExperimentCard = true
        metrics.track(Event.SetDefaultBrowserNewTabClicked)
        activity.openSetDefaultBrowserOption()
    }

    override fun handleCloseExperimentCard() {
        settings.userDismissedExperimentCard = true
        metrics.track(Event.CloseExperimentCardClicked)
        fragmentStore.dispatch(HomeFragmentAction.RemoveSetDefaultBrowserCard)
    }

    override fun handlePrivateModeButtonClicked(
        newMode: BrowsingMode,
        userHasBeenOnboarded: Boolean
    ) {
        if (newMode == BrowsingMode.Private) {
            activity.settings().incrementNumTimesPrivateModeOpened()
        }

        if (userHasBeenOnboarded) {
            fragmentStore.dispatch(
                HomeFragmentAction.ModeChange(Mode.fromBrowsingMode(newMode))
            )

            if (navController.currentDestination?.id == R.id.searchDialogFragment) {
                navController.navigate(
                    BrowserFragmentDirections.actionGlobalSearchDialog(
                        sessionId = null
                    )
                )
            }
        }
    }

    override fun handleReportSessionMetrics(state: HomeFragmentState) {
        metrics.track(
            if (state.recentTabs.isEmpty()) Event.RecentTabsSectionIsNotVisible
            else Event.RecentTabsSectionIsVisible
        )
    }
}