/* 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.share

import android.content.Context
import android.content.Intent
import android.content.Intent.ACTION_SEND
import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
import android.content.pm.ResolveInfo
import android.os.Bundle
import android.os.Parcelable
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.appcompat.app.AppCompatDialogFragment
import androidx.lifecycle.lifecycleScope
import androidx.navigation.fragment.findNavController
import kotlinx.android.parcel.Parcelize
import kotlinx.android.synthetic.main.fragment_share.view.*
import kotlinx.coroutines.Deferred
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.async
import kotlinx.coroutines.launch
import mozilla.components.concept.sync.DeviceCapability
import mozilla.components.concept.sync.DeviceType
import mozilla.components.feature.sendtab.SendTabUseCases
import mozilla.components.service.fxa.manager.FxaAccountManager
import org.mozilla.fenix.R
import org.mozilla.fenix.ext.components
import org.mozilla.fenix.ext.requireComponents
import org.mozilla.fenix.share.listadapters.AppShareOption
import org.mozilla.fenix.share.listadapters.SyncShareOption

@Suppress("TooManyFunctions")
class ShareFragment : AppCompatDialogFragment() {
    interface TabsSharedCallback {
        fun onTabsShared(tabsSize: Int)
    }

    private lateinit var shareInteractor: ShareInteractor
    private lateinit var shareCloseView: ShareCloseView
    private lateinit var shareToAccountDevicesView: ShareToAccountDevicesView
    private lateinit var shareToAppsView: ShareToAppsView
    private lateinit var appsListDeferred: Deferred<List<AppShareOption>>
    private lateinit var devicesListDeferred: Deferred<List<SyncShareOption>>

    override fun onAttach(context: Context) {
        super.onAttach(context)

        // Start preparing the data as soon as we have a valid Context
        appsListDeferred = lifecycleScope.async(Dispatchers.IO) {
            val shareIntent = Intent(ACTION_SEND).apply {
                type = "text/plain"
                flags = FLAG_ACTIVITY_NEW_TASK
            }
            val shareAppsActivities = getIntentActivities(shareIntent, context)
            buildAppsList(shareAppsActivities, context)
        }

        devicesListDeferred = lifecycleScope.async(Dispatchers.IO) {
            val fxaAccountManager = context.components.backgroundServices.accountManager
            buildDeviceList(fxaAccountManager)
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setStyle(STYLE_NO_TITLE, R.style.ShareDialogStyle)
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val view = inflater.inflate(R.layout.fragment_share, container, false)
        val args = ShareFragmentArgs.fromBundle(arguments!!)
        if (args.url == null && args.tabs.isNullOrEmpty()) {
            throw IllegalStateException("URL and tabs cannot both be null.")
        }

        val tabs = args.tabs?.toList() ?: listOf(ShareTab(args.url!!, args.title ?: ""))
        val accountManager = requireComponents.backgroundServices.accountManager

        shareInteractor = ShareInteractor(
            DefaultShareController(
                context = requireContext(),
                fragment = this,
                sharedTabs = tabs,
                navController = findNavController(),
                sendTabUseCases = SendTabUseCases(accountManager),
                dismiss = ::dismiss
            )
        )

        if (isSharingToDevicesAvailable(requireContext().applicationContext)) {
            shareToAccountDevicesView = ShareToAccountDevicesView(view.devicesShareLayout, shareInteractor)
        } else {
            view.devicesShareGroup.visibility = View.GONE
        }
        shareCloseView = ShareCloseView(view.closeSharingLayout, shareInteractor)
        shareToAppsView = ShareToAppsView(view.appsShareLayout, shareInteractor)

        return view
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        lifecycleScope.launch {
            val devicesShareOptions = devicesListDeferred.await()
            shareToAccountDevicesView.setSharetargets(devicesShareOptions)
            val appsToShareTo = appsListDeferred.await()
            shareToAppsView.setSharetargets(appsToShareTo)
        }
    }

    private fun isSharingToDevicesAvailable(context: Context) =
        !context.components.backgroundServices.accountManager.accountNeedsReauth()

    private fun getIntentActivities(shareIntent: Intent, context: Context): List<ResolveInfo>? {
        return context.packageManager.queryIntentActivities(shareIntent, 0)
    }

    private fun buildAppsList(intentActivities: List<ResolveInfo>?, context: Context): List<AppShareOption> {
        return intentActivities?.map { resolveInfo ->
            AppShareOption(
                resolveInfo.loadLabel(context.packageManager).toString(),
                resolveInfo.loadIcon(context.packageManager),
                resolveInfo.activityInfo.packageName,
                resolveInfo.activityInfo.name
            )
        } ?: emptyList()
    }

    private fun buildDeviceList(accountManager: FxaAccountManager): List<SyncShareOption> {
        val list = mutableListOf<SyncShareOption>()

        if (accountManager.authenticatedAccount() == null) {
            list.add(SyncShareOption.SignIn)
            return list
        }

        accountManager.authenticatedAccount()?.deviceConstellation()?.state()?.otherDevices?.let { devices ->
            val shareableDevices = devices.filter { it.capabilities.contains(DeviceCapability.SEND_TAB) }

            if (shareableDevices.isEmpty()) {
                list.add(SyncShareOption.AddNewDevice)
            }

            val shareOptions = shareableDevices.map {
                when (it.deviceType) {
                    DeviceType.MOBILE -> SyncShareOption.Mobile(it.displayName, it)
                    else -> SyncShareOption.Desktop(it.displayName, it)
                }
            }
            list.addAll(shareOptions)

            if (shareableDevices.size > 1) {
                list.add(SyncShareOption.SendAll(shareableDevices))
            }
        }
        return list
    }
}

@Parcelize
data class ShareTab(val url: String, val title: String) : Parcelable