package im.angry.openeuicc.ui

import android.annotation.SuppressLint
import android.content.Intent
import android.os.Bundle
import android.text.method.PasswordTransformationMethod
import android.util.Log
import android.view.LayoutInflater
import android.view.Menu
import android.view.MenuInflater
import android.view.MenuItem
import android.view.View
import android.view.ViewGroup
import android.widget.FrameLayout
import android.widget.ImageButton
import android.widget.PopupMenu
import android.widget.TextView
import android.widget.Toast
import androidx.fragment.app.Fragment
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
import com.google.android.material.floatingactionbutton.FloatingActionButton
import net.typeblog.lpac_jni.LocalProfileInfo
import im.angry.openeuicc.common.R
import im.angry.openeuicc.util.*
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.flow.first
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
import java.lang.Exception

open class EuiccManagementFragment : Fragment(), EuiccProfilesChangedListener,
    EuiccChannelFragmentMarker {
    companion object {
        const val TAG = "EuiccManagementFragment"

        fun newInstance(slotId: Int, portId: Int): EuiccManagementFragment =
            newInstanceEuicc(EuiccManagementFragment::class.java, slotId, portId)
    }

    private lateinit var swipeRefresh: SwipeRefreshLayout
    private lateinit var fab: FloatingActionButton
    private lateinit var profileList: RecyclerView

    private val adapter = EuiccProfileAdapter()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setHasOptionsMenu(true)
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        val view = inflater.inflate(R.layout.fragment_euicc, container, false)

        swipeRefresh = view.requireViewById(R.id.swipe_refresh)
        fab = view.requireViewById(R.id.fab)
        profileList = view.requireViewById(R.id.profile_list)

        return view
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        swipeRefresh.setOnRefreshListener { refresh() }
        profileList.adapter = adapter
        profileList.layoutManager =
            LinearLayoutManager(view.context, LinearLayoutManager.VERTICAL, false)

        fab.setOnClickListener {
            ProfileDownloadFragment.newInstance(slotId, portId)
                .show(childFragmentManager, ProfileDownloadFragment.TAG)
        }
    }

    override fun onStart() {
        super.onStart()
        refresh()
    }

    override fun onEuiccProfilesChanged() {
        refresh()
    }

    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
        super.onCreateOptionsMenu(menu, inflater)
        inflater.inflate(R.menu.fragment_euicc, menu)
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean =
        when (item.itemId) {
            R.id.show_notifications -> {
                Intent(requireContext(), NotificationsActivity::class.java).apply {
                    putExtra("logicalSlotId", channel.logicalSlotId)
                    startActivity(this)
                }
                true
            }
            else -> super.onOptionsItemSelected(item)
        }

    protected open suspend fun onCreateFooterViews(parent: ViewGroup): List<View> = listOf()

    @SuppressLint("NotifyDataSetChanged")
    private fun refresh() {
        swipeRefresh.isRefreshing = true

        lifecycleScope.launch {
            val profiles = withContext(Dispatchers.IO) {
                euiccChannelManager.notifyEuiccProfilesChanged(channel.logicalSlotId)
                channel.lpa.profiles
            }

            withContext(Dispatchers.Main) {
                adapter.profiles = profiles.operational
                adapter.footerViews = onCreateFooterViews(profileList)
                adapter.notifyDataSetChanged()
                swipeRefresh.isRefreshing = false
            }
        }
    }

    private fun enableOrDisableProfile(iccid: String, enable: Boolean) {
        swipeRefresh.isRefreshing = true
        fab.isEnabled = false

        lifecycleScope.launch {
            try {
                if (enable) {
                    doEnableProfile(iccid)
                } else {
                    doDisableProfile(iccid)
                }
                refresh()
                fab.isEnabled = true
            } catch (e: Exception) {
                Log.d(TAG, "Failed to enable / disable profile $iccid")
                Log.d(TAG, Log.getStackTraceString(e))
                fab.isEnabled = true
                Toast.makeText(context, R.string.toast_profile_enable_failed, Toast.LENGTH_LONG).show()
            }
        }
    }

    private suspend fun doEnableProfile(iccid: String) =
        channel.lpa.beginOperation {
            channel.lpa.enableProfile(iccid, reconnectTimeout = 15 * 1000) &&
                preferenceRepository.notificationEnableFlow.first()
        }

    private suspend fun doDisableProfile(iccid: String) =
        channel.lpa.beginOperation {
            channel.lpa.disableProfile(iccid, reconnectTimeout = 15 * 1000) &&
                preferenceRepository.notificationDisableFlow.first()
        }

    protected open fun populatePopupWithProfileActions(popup: PopupMenu, profile: LocalProfileInfo) {
        popup.inflate(R.menu.profile_options)
        if (profile.isEnabled) {
            popup.menu.findItem(R.id.enable).isVisible = false
            popup.menu.findItem(R.id.delete).isVisible = false
        }
    }

    sealed class ViewHolder(root: View) : RecyclerView.ViewHolder(root) {
        enum class Type(val value: Int) {
            PROFILE(0),
            FOOTER(1);

            companion object {
                fun fromInt(value: Int) =
                    Type.values().first { it.value == value }
            }
        }
    }

    inner class FooterViewHolder: ViewHolder(FrameLayout(requireContext())) {
        fun attach(view: View) {
            view.parent?.let { (it as ViewGroup).removeView(view) }
            (itemView as FrameLayout).addView(view)
        }

        fun detach() {
            (itemView as FrameLayout).removeAllViews()
        }
    }

    inner class ProfileViewHolder(private val root: View) : ViewHolder(root) {
        private val iccid: TextView = root.requireViewById(R.id.iccid)
        private val name: TextView = root.requireViewById(R.id.name)
        private val state: TextView = root.requireViewById(R.id.state)
        private val provider: TextView = root.requireViewById(R.id.provider)
        private val profileMenu: ImageButton = root.requireViewById(R.id.profile_menu)

        init {
            iccid.setOnClickListener {
                if (iccid.transformationMethod == null) {
                    iccid.transformationMethod = PasswordTransformationMethod.getInstance()
                } else {
                    iccid.transformationMethod = null
                }
            }

            profileMenu.setOnClickListener { showOptionsMenu() }
        }

        private lateinit var profile: LocalProfileInfo

        fun setProfile(profile: LocalProfileInfo) {
            this.profile = profile
            name.text = profile.displayName

            state.setText(
                if (profile.isEnabled) {
                    R.string.enabled
                } else {
                    R.string.disabled
                }
            )
            provider.text = profile.providerName
            iccid.text = profile.iccid
            iccid.transformationMethod = PasswordTransformationMethod.getInstance()
        }

        private fun showOptionsMenu() {
            PopupMenu(root.context, profileMenu).apply {
                setOnMenuItemClickListener(::onMenuItemClicked)
                populatePopupWithProfileActions(this, profile)
                show()
            }
        }

        private fun onMenuItemClicked(item: MenuItem): Boolean =
            when (item.itemId) {
                R.id.enable -> {
                    enableOrDisableProfile(profile.iccid, true)
                    true
                }
                R.id.disable -> {
                    enableOrDisableProfile(profile.iccid, false)
                    true
                }
                R.id.rename -> {
                    ProfileRenameFragment.newInstance(slotId, portId, profile.iccid, profile.displayName)
                        .show(childFragmentManager, ProfileRenameFragment.TAG)
                    true
                }
                R.id.delete -> {
                    ProfileDeleteFragment.newInstance(slotId, portId, profile.iccid, profile.displayName)
                        .show(childFragmentManager, ProfileDeleteFragment.TAG)
                    true
                }
                else -> false
            }
    }

    inner class EuiccProfileAdapter : RecyclerView.Adapter<ViewHolder>() {
        var profiles: List<LocalProfileInfo> = listOf()
        var footerViews: List<View> = listOf()

        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder =
            when (ViewHolder.Type.fromInt(viewType)) {
                ViewHolder.Type.PROFILE -> {
                    val view = LayoutInflater.from(parent.context).inflate(R.layout.euicc_profile, parent, false)
                    ProfileViewHolder(view)
                }
                ViewHolder.Type.FOOTER -> {
                    FooterViewHolder()
                }
            }

        override fun getItemViewType(position: Int): Int =
            when {
                position < profiles.size -> {
                    ViewHolder.Type.PROFILE.value
                }
                position >= profiles.size && position < profiles.size + footerViews.size -> {
                    ViewHolder.Type.FOOTER.value
                }
                else -> -1
            }

        override fun onBindViewHolder(holder: ViewHolder, position: Int) {
            when (holder) {
                is ProfileViewHolder -> {
                    holder.setProfile(profiles[position])
                }
                is FooterViewHolder -> {
                    holder.attach(footerViews[position - profiles.size])
                }
            }
        }

        override fun onViewRecycled(holder: ViewHolder) {
            if (holder is FooterViewHolder) {
                holder.detach()
            }
        }

        override fun getItemCount(): Int = profiles.size + footerViews.size
    }
}