/* 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.search

import android.content.DialogInterface
import android.content.Intent
import android.net.Uri
import android.os.Build
import android.text.SpannableString
import androidx.annotation.VisibleForTesting
import androidx.appcompat.app.AlertDialog
import androidx.navigation.NavController
import mozilla.components.browser.state.search.SearchEngine
import mozilla.components.browser.state.state.selectedOrDefaultSearchEngine
import mozilla.components.browser.state.store.BrowserStore
import mozilla.components.concept.engine.EngineSession.LoadUrlFlags
import mozilla.components.feature.tabs.TabsUseCases
import mozilla.components.support.ktx.kotlin.isUrl
import mozilla.components.ui.widgets.withCenterAlignedButtons
import org.mozilla.fenix.BrowserDirection
import org.mozilla.fenix.GleanMetrics.Events
import org.mozilla.fenix.GleanMetrics.SearchShortcuts
import org.mozilla.fenix.GleanMetrics.UnifiedSearch
import org.mozilla.fenix.HomeActivity
import org.mozilla.fenix.R
import org.mozilla.fenix.components.Core
import org.mozilla.fenix.components.metrics.MetricsUtils
import org.mozilla.fenix.crashes.CrashListActivity
import org.mozilla.fenix.ext.application
import org.mozilla.fenix.ext.navigateSafe
import org.mozilla.fenix.ext.settings
import org.mozilla.fenix.ext.telemetryName
import org.mozilla.fenix.search.awesomebar.AwesomeBarView.Companion.GOOGLE_SEARCH_ENGINE_NAME
import org.mozilla.fenix.search.toolbar.SearchSelectorInteractor
import org.mozilla.fenix.search.toolbar.SearchSelectorMenu
import org.mozilla.fenix.settings.SupportUtils
import org.mozilla.fenix.utils.Settings

/**
 * An interface that handles the view manipulation of the Search, triggered by the Interactor
 */
@Suppress("TooManyFunctions")
interface SearchController {
    fun handleUrlCommitted(url: String, fromHomeScreen: Boolean = false)
    fun handleEditingCancelled()
    fun handleTextChanged(text: String)
    fun handleUrlTapped(url: String, flags: LoadUrlFlags = LoadUrlFlags.none())
    fun handleSearchTermsTapped(searchTerms: String)
    fun handleSearchShortcutEngineSelected(searchEngine: SearchEngine)
    fun handleClickSearchEngineSettings()
    fun handleExistingSessionSelected(tabId: String)
    fun handleSearchShortcutsButtonClicked()
    fun handleCameraPermissionsNeeded()
    fun handleSearchEngineSuggestionClicked(searchEngine: SearchEngine)

    /**
     * @see [SearchSelectorInteractor.onMenuItemTapped]
     */
    fun handleMenuItemTapped(item: SearchSelectorMenu.Item)
}

@Suppress("TooManyFunctions", "LongParameterList")
class SearchDialogController(
    private val activity: HomeActivity,
    private val store: BrowserStore,
    private val tabsUseCases: TabsUseCases,
    private val fragmentStore: SearchFragmentStore,
    private val navController: NavController,
    private val settings: Settings,
    private val dismissDialog: () -> Unit,
    private val clearToolbarFocus: () -> Unit,
    private val focusToolbar: () -> Unit,
    private val clearToolbar: () -> Unit,
    private val dismissDialogAndGoBack: () -> Unit,
) : SearchController {

    override fun handleUrlCommitted(url: String, fromHomeScreen: Boolean) {
        // Do not load URL if application search engine is selected.
        if (fragmentStore.state.searchEngineSource.searchEngine?.type == SearchEngine.Type.APPLICATION) {
            return
        }

        when (url) {
            "about:crashes" -> {
                // The list of past crashes can be accessed via "settings > about", but desktop and
                // fennec users may be used to navigating to "about:crashes". So we intercept this here
                // and open the crash list activity instead.
                activity.startActivity(Intent(activity, CrashListActivity::class.java))
            }
            "about:addons" -> {
                val directions =
                    SearchDialogFragmentDirections.actionGlobalAddonsManagementFragment()
                navController.navigateSafe(R.id.searchDialogFragment, directions)
            }
            "moz://a" -> openSearchOrUrl(
                SupportUtils.getMozillaPageUrl(SupportUtils.MozillaPage.MANIFESTO),
                fromHomeScreen,
            )
            else ->
                if (url.isNotBlank()) {
                    openSearchOrUrl(url, fromHomeScreen)
                }
        }
        dismissDialog()
    }

    private fun openSearchOrUrl(url: String, fromHomeScreen: Boolean) {
        clearToolbarFocus()

        val searchEngine = fragmentStore.state.searchEngineSource.searchEngine
        val isDefaultEngine = searchEngine == fragmentStore.state.defaultEngine
        val additionalHeaders = getAdditionalHeaders(searchEngine)
        val flags = if (additionalHeaders.isNullOrEmpty()) {
            LoadUrlFlags.none()
        } else {
            LoadUrlFlags.select(LoadUrlFlags.ALLOW_ADDITIONAL_HEADERS)
        }

        activity.openToBrowserAndLoad(
            searchTermOrURL = url,
            newTab = fragmentStore.state.tabId == null,
            from = BrowserDirection.FromSearchDialog,
            engine = searchEngine,
            forceSearch = !isDefaultEngine,
            flags = flags,
            requestDesktopMode = fromHomeScreen && activity.settings().openNextTabInDesktopMode,
            additionalHeaders = additionalHeaders,
        )

        if (url.isUrl() || searchEngine == null) {
            Events.enteredUrl.record(Events.EnteredUrlExtra(autocomplete = false))
        } else {
            val searchAccessPoint = when (fragmentStore.state.searchAccessPoint) {
                MetricsUtils.Source.NONE -> MetricsUtils.Source.ACTION
                else -> fragmentStore.state.searchAccessPoint
            }

            MetricsUtils.recordSearchMetrics(
                searchEngine,
                isDefaultEngine,
                searchAccessPoint,
            )
        }
    }

    override fun handleEditingCancelled() {
        clearToolbarFocus()
        dismissDialogAndGoBack()
    }

    override fun handleTextChanged(text: String) {
        // Display the search shortcuts on each entry of the search fragment (see #5308)
        val textMatchesCurrentUrl = fragmentStore.state.url == text
        val textMatchesCurrentSearch = fragmentStore.state.searchTerms == text

        fragmentStore.dispatch(SearchFragmentAction.UpdateQuery(text))
        fragmentStore.dispatch(
            SearchFragmentAction.ShowSearchShortcutEnginePicker(
                !settings.showUnifiedSearchFeature &&
                    (textMatchesCurrentUrl || textMatchesCurrentSearch || text.isEmpty()) &&
                    settings.shouldShowSearchShortcuts,
            ),
        )
        fragmentStore.dispatch(
            SearchFragmentAction.AllowSearchSuggestionsInPrivateModePrompt(
                text.isNotEmpty() &&
                    activity.browsingModeManager.mode.isPrivate &&
                    !settings.shouldShowSearchSuggestionsInPrivate &&
                    !settings.showSearchSuggestionsInPrivateOnboardingFinished,
            ),
        )
    }

    override fun handleUrlTapped(url: String, flags: LoadUrlFlags) {
        clearToolbarFocus()

        activity.openToBrowserAndLoad(
            searchTermOrURL = url,
            newTab = fragmentStore.state.tabId == null,
            from = BrowserDirection.FromSearchDialog,
            flags = flags,
        )

        Events.enteredUrl.record(Events.EnteredUrlExtra(autocomplete = false))
    }

    override fun handleSearchTermsTapped(searchTerms: String) {
        clearToolbarFocus()

        val searchEngine = fragmentStore.state.searchEngineSource.searchEngine
        val additionalHeaders = getAdditionalHeaders(searchEngine)
        val flags = if (additionalHeaders.isNullOrEmpty()) {
            LoadUrlFlags.none()
        } else {
            LoadUrlFlags.select(LoadUrlFlags.ALLOW_ADDITIONAL_HEADERS)
        }

        activity.openToBrowserAndLoad(
            searchTermOrURL = searchTerms,
            newTab = fragmentStore.state.tabId == null,
            from = BrowserDirection.FromSearchDialog,
            engine = searchEngine,
            forceSearch = true,
            flags = flags,
            additionalHeaders = additionalHeaders,
        )

        val searchAccessPoint = when (fragmentStore.state.searchAccessPoint) {
            MetricsUtils.Source.NONE -> MetricsUtils.Source.SUGGESTION
            else -> fragmentStore.state.searchAccessPoint
        }

        if (searchEngine != null) {
            MetricsUtils.recordSearchMetrics(
                searchEngine,
                searchEngine == store.state.search.selectedOrDefaultSearchEngine,
                searchAccessPoint,
            )
        }
    }

    override fun handleSearchShortcutEngineSelected(searchEngine: SearchEngine) {
        focusToolbar()

        when {
            searchEngine.type == SearchEngine.Type.APPLICATION && searchEngine.id == Core.HISTORY_SEARCH_ENGINE_ID -> {
                fragmentStore.dispatch(SearchFragmentAction.SearchHistoryEngineSelected(searchEngine))
            }
            searchEngine.type == SearchEngine.Type.APPLICATION &&
                searchEngine.id == Core.BOOKMARKS_SEARCH_ENGINE_ID -> {
                fragmentStore.dispatch(SearchFragmentAction.SearchBookmarksEngineSelected(searchEngine))
            }
            searchEngine.type == SearchEngine.Type.APPLICATION && searchEngine.id == Core.TABS_SEARCH_ENGINE_ID -> {
                fragmentStore.dispatch(SearchFragmentAction.SearchTabsEngineSelected(searchEngine))
            }
            searchEngine == store.state.search.selectedOrDefaultSearchEngine -> {
                fragmentStore.dispatch(
                    SearchFragmentAction.SearchDefaultEngineSelected(
                        engine = searchEngine,
                        browsingMode = activity.browsingModeManager.mode,
                        settings = settings,
                    ),
                )
            }
            else -> {
                fragmentStore.dispatch(
                    SearchFragmentAction.SearchShortcutEngineSelected(
                        engine = searchEngine,
                        browsingMode = activity.browsingModeManager.mode,
                        settings = settings,
                    ),
                )
            }
        }

        if (settings.showUnifiedSearchFeature) {
            UnifiedSearch.engineSelected.record(UnifiedSearch.EngineSelectedExtra(searchEngine.telemetryName()))
        } else {
            SearchShortcuts.selected.record(SearchShortcuts.SelectedExtra(searchEngine.telemetryName()))
        }
    }

    override fun handleSearchShortcutsButtonClicked() {
        val isOpen = fragmentStore.state.showSearchShortcuts
        fragmentStore.dispatch(SearchFragmentAction.ShowSearchShortcutEnginePicker(!isOpen))
    }

    override fun handleClickSearchEngineSettings() {
        clearToolbarFocus()
        val directions = SearchDialogFragmentDirections.actionGlobalSearchEngineFragment()
        navController.navigateSafe(R.id.searchDialogFragment, directions)
    }

    override fun handleExistingSessionSelected(tabId: String) {
        clearToolbarFocus()

        tabsUseCases.selectTab(tabId)

        activity.openToBrowser(
            from = BrowserDirection.FromSearchDialog,
        )
    }

    /**
     * Creates and shows an [AlertDialog] when camera permissions are needed.
     *
     * In versions above M, [AlertDialog.BUTTON_POSITIVE] takes the user to the app settings. This
     * intent only exists in M and above. Below M, [AlertDialog.BUTTON_POSITIVE] routes to a SUMO
     * help page to find the app settings.
     *
     * [AlertDialog.BUTTON_NEGATIVE] dismisses the dialog.
     */
    override fun handleCameraPermissionsNeeded() {
        val dialog = buildDialog()
        dialog.show()
    }

    override fun handleSearchEngineSuggestionClicked(searchEngine: SearchEngine) {
        clearToolbar()
        handleSearchShortcutEngineSelected(searchEngine)
    }

    override fun handleMenuItemTapped(item: SearchSelectorMenu.Item) {
        when (item) {
            SearchSelectorMenu.Item.SearchSettings -> handleClickSearchEngineSettings()
            is SearchSelectorMenu.Item.SearchEngine -> handleSearchShortcutEngineSelected(item.searchEngine)
        }
    }

    @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
    fun buildDialog(): AlertDialog.Builder {
        return AlertDialog.Builder(activity).apply {
            val spannableText = SpannableString(
                activity.resources.getString(R.string.camera_permissions_needed_message),
            )
            setMessage(spannableText)
            setNegativeButton(R.string.camera_permissions_needed_negative_button_text) { _, _ ->
                dismissDialog()
            }
            setPositiveButton(R.string.camera_permissions_needed_positive_button_text) {
                    dialog: DialogInterface, _ ->
                val intent: Intent = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
                } else {
                    SupportUtils.createCustomTabIntent(
                        activity,
                        SupportUtils.getSumoURLForTopic(
                            activity,
                            SupportUtils.SumoTopic.QR_CAMERA_ACCESS,
                        ),
                    )
                }
                val uri = Uri.fromParts("package", activity.packageName, null)
                intent.data = uri
                dialog.cancel()
                activity.startActivity(intent)
            }
            create().withCenterAlignedButtons()
        }
    }

    private fun getAdditionalHeaders(searchEngine: SearchEngine?): Map<String, String>? {
        if (searchEngine?.name != GOOGLE_SEARCH_ENGINE_NAME) {
            return null
        }

        val value = if (activity.applicationContext.application.isDeviceRamAboveThreshold) {
            "1"
        } else {
            "0"
        }

        return mapOf(
            "X-Search-Subdivision" to value,
        )
    }
}