/* 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.metrics

import android.content.Context
import mozilla.components.service.glean.Glean
import mozilla.components.service.glean.private.NoExtraKeys
import mozilla.components.support.utils.Browsers
import org.mozilla.fenix.GleanMetrics.BookmarksManagement
import org.mozilla.fenix.GleanMetrics.ContextMenu
import org.mozilla.fenix.GleanMetrics.CrashReporter
import org.mozilla.fenix.GleanMetrics.CustomTab
import org.mozilla.fenix.GleanMetrics.Events
import org.mozilla.fenix.GleanMetrics.FindInPage
import org.mozilla.fenix.GleanMetrics.Metrics
import org.mozilla.fenix.GleanMetrics.Pings
import org.mozilla.fenix.GleanMetrics.QuickActionSheet
import org.mozilla.fenix.GleanMetrics.SearchDefaultEngine
import org.mozilla.fenix.ext.components
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Job
import kotlinx.coroutines.launch
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.runBlocking
import org.mozilla.fenix.GleanMetrics.QrScanner
import org.mozilla.fenix.GleanMetrics.Library

private class EventWrapper<T : Enum<T>>(
    private val recorder: ((Map<T, String>?) -> Unit),
    private val keyMapper: ((String) -> T)? = null
) {
    private val String.asCamelCase: String
        get() = this.split("_").reduceIndexed { index, acc, s ->
            if (index == 0) acc + s
            else acc + s.capitalize()
        }

    fun track(event: Event) {
        val extras = if (keyMapper != null) {
            event.extras?.mapKeys { keyMapper.invoke(it.key.asCamelCase) }
        } else {
            null
        }

        this.recorder(extras)
    }
}

private val Event.wrapper
    get() = when (this) {
        is Event.OpenedApp -> EventWrapper(
            { Events.appOpened.record(it) },
            { Events.appOpenedKeys.valueOf(it) }
        )
        is Event.SearchBarTapped -> EventWrapper(
            { Events.searchBarTapped.record(it) },
            { Events.searchBarTappedKeys.valueOf(it) }
        )
        is Event.EnteredUrl -> EventWrapper(
            { Events.enteredUrl.record(it) },
            { Events.enteredUrlKeys.valueOf(it) }
        )
        is Event.PerformedSearch -> EventWrapper(
            {
                Metrics.searchCount[this.eventSource.countLabel].add(1)
                Events.performedSearch.record(it)
            },
            { Events.performedSearchKeys.valueOf(it) }
        )
        is Event.FindInPageOpened -> EventWrapper<NoExtraKeys>(
            { FindInPage.opened.record(it) }
        )
        is Event.FindInPageClosed -> EventWrapper<NoExtraKeys>(
            { FindInPage.closed.record(it) }
        )
        is Event.FindInPageNext -> EventWrapper<NoExtraKeys>(
            { FindInPage.nextResult.record(it) }
        )
        is Event.FindInPagePrevious -> EventWrapper<NoExtraKeys>(
            { FindInPage.previousResult.record(it) }
        )
        is Event.FindInPageSearchCommitted -> EventWrapper<NoExtraKeys>(
            { FindInPage.searchedPage.record(it) }
        )
        is Event.ContextMenuItemTapped -> EventWrapper(
            { ContextMenu.itemTapped.record(it) },
            { ContextMenu.itemTappedKeys.valueOf(it) }
        )
        is Event.CrashReporterOpened -> EventWrapper<NoExtraKeys>(
            { CrashReporter.opened }
        )
        is Event.CrashReporterClosed -> EventWrapper(
            { CrashReporter.closed },
            { CrashReporter.closedKeys.valueOf(it) }
        )
        is Event.BrowserMenuItemTapped -> EventWrapper(
            { Events.browserMenuAction },
            { Events.browserMenuActionKeys.valueOf(it) }
        )
        is Event.QuickActionSheetOpened -> EventWrapper<NoExtraKeys>(
            { QuickActionSheet.opened.record(it) }
        )
        is Event.QuickActionSheetClosed -> EventWrapper<NoExtraKeys>(
            { QuickActionSheet.closed.record(it) }
        )
        is Event.QuickActionSheetShareTapped -> EventWrapper<NoExtraKeys>(
            { QuickActionSheet.shareTapped.record(it) }
        )
        is Event.QuickActionSheetBookmarkTapped -> EventWrapper<NoExtraKeys>(
            { QuickActionSheet.bookmarkTapped.record(it) }
        )
        is Event.QuickActionSheetDownloadTapped -> EventWrapper<NoExtraKeys>(
            { QuickActionSheet.downloadTapped.record(it) }
        )
        is Event.QuickActionSheetReadTapped -> EventWrapper<NoExtraKeys>(
            { QuickActionSheet.readTapped.record(it) }
        )
        is Event.OpenedBookmarkInNewTab -> EventWrapper<NoExtraKeys>(
            { BookmarksManagement.openInNewTab.record(it) }
        )
        is Event.OpenedBookmarksInNewTabs -> EventWrapper<NoExtraKeys>(
            { BookmarksManagement.openInNewTabs.record(it) }
        )
        is Event.OpenedBookmarkInPrivateTab -> EventWrapper<NoExtraKeys>(
            { BookmarksManagement.openInPrivateTab.record(it) }
        )
        is Event.OpenedBookmarksInPrivateTabs -> EventWrapper<NoExtraKeys>(
            { BookmarksManagement.openInPrivateTabs.record(it) }
        )
        is Event.EditedBookmark -> EventWrapper<NoExtraKeys>(
            { BookmarksManagement.edited.record(it) }
        )
        is Event.MovedBookmark -> EventWrapper<NoExtraKeys>(
            { BookmarksManagement.moved.record(it) }
        )
        is Event.RemoveBookmark -> EventWrapper<NoExtraKeys>(
            { BookmarksManagement.removed.record(it) }
        )
        is Event.RemoveBookmarks -> EventWrapper<NoExtraKeys>(
            { BookmarksManagement.multiRemoved.record(it) }
        )
        is Event.ShareBookmark -> EventWrapper<NoExtraKeys>(
            { BookmarksManagement.shared.record(it) }
        )
        is Event.CopyBookmark -> EventWrapper<NoExtraKeys>(
            { BookmarksManagement.copied.record(it) }
        )
        is Event.AddBookmarkFolder -> EventWrapper<NoExtraKeys>(
            { BookmarksManagement.folderAdd.record(it) }
        )
        is Event.CustomTabsMenuOpened -> EventWrapper<NoExtraKeys>(
            { CustomTab.menu.record(it) }
        )
        is Event.CustomTabsActionTapped -> EventWrapper<NoExtraKeys>(
            { CustomTab.actionButton.record(it) }
        )
        is Event.CustomTabsClosed -> EventWrapper<NoExtraKeys>(
            { CustomTab.closed.record(it) }
        )
        is Event.UriOpened -> EventWrapper<NoExtraKeys>(
            { Events.totalUriCount.add(1) }
        )
        is Event.QRScannerOpened -> EventWrapper<NoExtraKeys>(
            { QrScanner.opened.record(it) }
        )
        is Event.QRScannerPromptDisplayed -> EventWrapper<NoExtraKeys>(
            { QrScanner.promptDisplayed.record(it) }
        )
        is Event.QRScannerNavigationAllowed -> EventWrapper<NoExtraKeys>(
            { QrScanner.navigationAllowed.record(it) }
        )
        is Event.QRScannerNavigationDenied -> EventWrapper<NoExtraKeys>(
            { QrScanner.navigationDenied.record(it) }
        )
        is Event.LibraryOpened -> EventWrapper<NoExtraKeys>(
            { Library.opened.record(it) }
        )
        is Event.LibraryClosed -> EventWrapper<NoExtraKeys>(
            { Library.closed.record(it) }
        )
        is Event.LibrarySelectedItem -> EventWrapper(
            { Library.selectedItem },
            { Library.selectedItemKeys.valueOf(it) }
        )

        // Don't track other events with Glean
        else -> null
    }

class GleanMetricsService(private val context: Context) : MetricsService {
    private var initialized = false
    /*
     * We need to keep an eye on when we are done starting so that we don't
     * accidentally stop ourselves before we've ever started.
     */
    private lateinit var starter: Job

    private val activationPing = ActivationPing(context)

    override fun start() {
        Glean.setUploadEnabled(true)

        if (initialized) return
        initialized = true

        starter = CoroutineScope(Dispatchers.Default).launch {
            Glean.registerPings(Pings)
            Glean.initialize(context)

            Metrics.apply {
                defaultBrowser.set(Browsers.all(context).isDefaultBrowser)
                defaultMozBrowser.set(MozillaProductDetector.getMozillaBrowserDefault(context) ?: "")
                mozillaProducts.set(MozillaProductDetector.getInstalledMozillaProducts(context))
            }

            SearchDefaultEngine.apply {
                val defaultEngine = context
                    .components
                    .search
                    .searchEngineManager
                    .defaultSearchEngine ?: return@apply

                code.set(defaultEngine.identifier)
                name.set(defaultEngine.name)
                submissionUrl.set(defaultEngine.buildSearchUrl(""))
            }

            activationPing.checkAndSend()
        }
    }

    override fun stop() {
        /*
         * We cannot stop until we're done starting.
         */
        runBlocking { starter.join(); }
        Glean.setUploadEnabled(false)
    }

    override fun track(event: Event) {
        event.wrapper?.track(event)
    }

    override fun shouldTrack(event: Event): Boolean {
        return event.wrapper != null
    }
}