/*
 * Copyright (C) 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.settings.deviceinfo.simstatus

import android.content.Context
import android.graphics.Bitmap
import android.util.Log
import android.view.WindowManager
import android.widget.ImageView
import android.widget.TextView
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.lifecycleScope
import androidx.lifecycle.repeatOnLifecycle
import androidx.preference.Preference
import androidx.preference.PreferenceScreen
import com.android.settings.R
import com.android.settings.core.BasePreferenceController
import com.android.settings.deviceinfo.PhoneNumberUtil
import com.android.settings.network.SubscriptionUtil
import com.android.settingslib.CustomDialogPreferenceCompat
import com.android.settingslib.Utils
import com.android.settingslib.qrcode.QrCodeGenerator
import com.android.settingslib.spaprivileged.framework.common.userManager
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext

/**
 * This is to show a preference regarding EID of SIM card.
 *
 * @param preferenceKey is the key for Preference
 */
class SimEidPreferenceController(context: Context, preferenceKey: String) :
    BasePreferenceController(context, preferenceKey) {
    private var slotSimStatus: SlotSimStatus? = null
    private var eidStatus: EidStatus? = null
    private lateinit var preference: CustomDialogPreferenceCompat
    private var coroutineScope: CoroutineScope? = null
    private lateinit var eid: String

    fun init(slotSimStatus: SlotSimStatus?, eidStatus: EidStatus?) {
        this.slotSimStatus = slotSimStatus
        this.eidStatus = eidStatus
    }

    /**
     * Returns available here, if SIM hardware is visible.
     *
     * Also check [getIsAvailableAndUpdateEid] for other availability check which retrieved
     * asynchronously later.
     */
    override fun getAvailabilityStatus() =
        if (SubscriptionUtil.isSimHardwareVisible(mContext)) AVAILABLE else UNSUPPORTED_ON_DEVICE

    override fun displayPreference(screen: PreferenceScreen) {
        super.displayPreference(screen)
        preference = screen.findPreference(preferenceKey)!!
    }

    override fun onViewCreated(viewLifecycleOwner: LifecycleOwner) {
        coroutineScope = viewLifecycleOwner.lifecycleScope
        coroutineScope?.launch {
            viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
                update()
            }
        }
    }

    private suspend fun update() {
        val isAvailable = withContext(Dispatchers.Default) {
            getIsAvailableAndUpdateEid()
        }
        preference.isVisible = isAvailable
        if (isAvailable) {
            val title = withContext(Dispatchers.Default) {
                getTitle()
            }
            preference.title = title
            preference.dialogTitle = title
            preference.summary = eid
            updateDialog()
        }
    }

    private fun getIsAvailableAndUpdateEid(): Boolean {
        if (!mContext.userManager.isAdminUser || Utils.isWifiOnly(mContext)) return false
        eid = eidStatus?.eid ?: ""
        return eid.isNotEmpty()
    }

    /** Constructs title string. */
    private fun getTitle(): String {
        val slotSize = slotSimStatus?.size() ?: 0
        if (slotSize <= 1) {
            return mContext.getString(R.string.status_eid)
        }
        // Only append slot index to title when more than 1 is available
        for (idxSlot in 0 until slotSize) {
            val subInfo = slotSimStatus?.getSubscriptionInfo(idxSlot)
            if (subInfo != null && subInfo.isEmbedded) {
                return mContext.getString(R.string.eid_multi_sim, idxSlot + 1)
            }
        }
        return mContext.getString(R.string.status_eid)
    }

    private suspend fun updateDialog() {
        val dialog = preference.dialog ?: return
        dialog.window?.setFlags(
            WindowManager.LayoutParams.FLAG_SECURE,
            WindowManager.LayoutParams.FLAG_SECURE
        )
        dialog.setCanceledOnTouchOutside(false)
        val textView = dialog.requireViewById<TextView>(R.id.esim_id_value)
        textView.text = PhoneNumberUtil.expandByTts(eid)

        val qrCodeView = dialog.requireViewById<ImageView>(R.id.esim_id_qrcode)
        qrCodeView.setImageBitmap(getEidQrCode(eid))
    }

    override fun handlePreferenceTreeClick(preference: Preference): Boolean {
        if (preference.key != preferenceKey) return false
        this.preference.setOnShowListener {
            coroutineScope?.launch { updateDialog() }
        }
        return true
    }

    override fun updateNonIndexableKeys(keys: MutableList<String>) {
        if (!isAvailable() || !getIsAvailableAndUpdateEid()) {
            keys += preferenceKey
        }
    }

    companion object {
        private const val TAG = "SimEidPreferenceController"
        private const val QR_CODE_SIZE = 600

        /**
         * Gets the QR code for EID
         * @param eid is the EID string
         * @return a Bitmap of QR code
         */
        private suspend fun getEidQrCode(eid: String): Bitmap? = withContext(Dispatchers.Default) {
            try {
                QrCodeGenerator.encodeQrCode(contents = eid, size = QR_CODE_SIZE)
            } catch (exception: Exception) {
                Log.w(TAG, "Error when creating QR code width $QR_CODE_SIZE", exception)
                null
            }
        }
    }
}