/*
 * Copyright (C) 2023 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.network

import android.content.Context
import android.telephony.SubscriptionInfo
import android.telephony.SubscriptionManager
import android.telephony.TelephonyManager
import android.telephony.UiccCardInfo
import android.telephony.UiccSlotInfo
import android.util.Log
import com.android.settings.spa.network.setAutomaticData
import com.android.settings.spa.network.setDefaultData
import com.android.settings.spa.network.setDefaultSms
import com.android.settings.spa.network.setDefaultVoice
import com.android.settingslib.utils.ThreadUtils
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext


private const val TAG = "SimOnboardingService"
private const val INVALID = SubscriptionManager.INVALID_SUBSCRIPTION_ID

class SimOnboardingService {
    var subscriptionManager:SubscriptionManager? = null
    var telephonyManager:TelephonyManager? = null

    var targetSubId: Int = INVALID
    var targetSubInfo: SubscriptionInfo? = null
    var availableSubInfoList: List<SubscriptionInfo> = listOf()
    var activeSubInfoList: List<SubscriptionInfo> = listOf()
    var slotInfoList: List<UiccSlotInfo> = listOf()
    var uiccCardInfoList: List<UiccCardInfo> = listOf()
    var targetPrimarySimCalls: Int = SubscriptionManager.INVALID_SUBSCRIPTION_ID
    var targetPrimarySimTexts: Int = SubscriptionManager.INVALID_SUBSCRIPTION_ID
    var targetPrimarySimMobileData: Int = SubscriptionManager.INVALID_SUBSCRIPTION_ID
    var targetPrimarySimAutoDataSwitch: Boolean = false
    var targetNonDds: Int = SubscriptionManager.INVALID_SUBSCRIPTION_ID
        get() {
            if(targetPrimarySimMobileData == SubscriptionManager.INVALID_SUBSCRIPTION_ID) {
                Log.w(TAG, "No DDS")
                return SubscriptionManager.INVALID_SUBSCRIPTION_ID
            }
            return userSelectedSubInfoList
                .filter { info -> info.subscriptionId != targetPrimarySimMobileData }
                .map { it.subscriptionId }
                .firstOrNull() ?: SubscriptionManager.INVALID_SUBSCRIPTION_ID
        }
    var callback: (Int) -> Unit = {}

    var isMultipleEnabledProfilesSupported: Boolean = false
        get() {
            if (uiccCardInfoList.isEmpty()) {
                Log.w(TAG, "UICC cards info list is empty.")
                return false
            }
            return  uiccCardInfoList.any { it.isMultipleEnabledProfilesSupported }
        }
    var isRemovableSimEnabled: Boolean = false
        get() {
            if(slotInfoList.isEmpty()) {
                Log.w(TAG, "UICC Slot info list is empty.")
                return false
            }
            return UiccSlotUtil.isRemovableSimEnabled(slotInfoList)
        }

    var doesTargetSimHaveEsimOperation = false
        get() {
            return targetSubInfo?.isEmbedded ?: false
        }

    var isUsableTargetSubscriptionId = false
        get() {
            return SubscriptionManager.isUsableSubscriptionId(targetSubId)
        }
    var getActiveModemCount = 0
        get() {
            return telephonyManager?.getActiveModemCount() ?: 0
        }

    var renameMutableMap : MutableMap<Int, String> = mutableMapOf()
    var userSelectedSubInfoList : MutableList<SubscriptionInfo> = mutableListOf()

    var isSimSelectionFinished = false
        get() {
            return getActiveModemCount != 0 && userSelectedSubInfoList.size == getActiveModemCount
        }

    var isAllOfSlotAssigned = false
        get() {
            if(getActiveModemCount == 0){
                Log.e(TAG, "isAllOfSlotAssigned: getActiveModemCount is 0")
                return true
            }
            return getActiveModemCount != 0 && activeSubInfoList.size == getActiveModemCount
        }

    fun isValid(): Boolean {
        return targetSubId != INVALID
            && targetSubInfo != null
            && activeSubInfoList.isNotEmpty()
            && slotInfoList.isNotEmpty()
    }

    fun clear() {
        targetSubId = -1
        targetSubInfo = null
        availableSubInfoList = listOf()
        activeSubInfoList = listOf()
        slotInfoList = listOf()
        uiccCardInfoList = listOf()
        targetPrimarySimCalls = -1
        targetPrimarySimTexts = -1
        targetPrimarySimMobileData = -1
        clearUserRecord()
    }

    fun clearUserRecord(){
        renameMutableMap.clear()
        userSelectedSubInfoList.clear()
    }

    fun initData(inputTargetSubId:Int,context: Context, callback: (Int) -> Unit) {
        this.callback = callback
        targetSubId = inputTargetSubId
        subscriptionManager = context.getSystemService(SubscriptionManager::class.java)
        telephonyManager = context.getSystemService(TelephonyManager::class.java)
        Log.d(
            TAG, "startInit: targetSubId:$targetSubId"
        )
        ThreadUtils.postOnBackgroundThread {
            activeSubInfoList = SubscriptionUtil.getActiveSubscriptions(subscriptionManager)
            availableSubInfoList = SubscriptionUtil.getAvailableSubscriptions(context)
            targetSubInfo =
                availableSubInfoList.find { subInfo -> subInfo.subscriptionId == targetSubId }
            targetSubInfo?.let { userSelectedSubInfoList.add(it) }
            Log.d(
                TAG, "targetSubId: $targetSubId" + ", targetSubInfo: $targetSubInfo" +
                    ". activeSubInfoList: $activeSubInfoList"
            )
            slotInfoList = telephonyManager?.uiccSlotsInfo?.toList() ?: listOf()
            Log.d(TAG, "slotInfoList: $slotInfoList.")
            uiccCardInfoList = telephonyManager?.uiccCardsInfo!!
            Log.d(TAG, "uiccCardInfoList: $uiccCardInfoList")

            targetPrimarySimCalls = SubscriptionManager.getDefaultVoiceSubscriptionId()
            targetPrimarySimTexts = SubscriptionManager.getDefaultSmsSubscriptionId()
            targetPrimarySimMobileData = SubscriptionManager.getDefaultDataSubscriptionId()
            Log.d(
                TAG,"doesTargetSimHaveEsimOperation: $doesTargetSimHaveEsimOperation" +
                    ", isRemovableSimEnabled: $isRemovableSimEnabled" +
                    ", isMultipleEnabledProfilesSupported: $isMultipleEnabledProfilesSupported" +
                    ", targetPrimarySimCalls: $targetPrimarySimCalls" +
                    ", targetPrimarySimTexts: $targetPrimarySimTexts" +
                    ", targetPrimarySimMobileData: $targetPrimarySimMobileData")
        }
    }

    /**
     * Return the subscriptionInfo list which has
     * the target subscriptionInfo + active subscriptionInfo.
     */
    fun getSelectableSubscriptionInfoList(): List<SubscriptionInfo> {
        var list: MutableList<SubscriptionInfo> = mutableListOf()
        list.addAll(activeSubInfoList)
        if (!list.contains(targetSubInfo)) {
            targetSubInfo?.let { list.add(it) }
        }

        return list.toList()
    }

    /**
     * Return the user selected SubscriptionInfo list.
     */
    fun getSelectedSubscriptionInfoList(): List<SubscriptionInfo> {
        if (userSelectedSubInfoList.isEmpty()){
            Log.d(TAG, "userSelectedSubInfoList is empty")
            return activeSubInfoList
        }
        return userSelectedSubInfoList.toList()
    }

    fun addItemForRenaming(subInfo: SubscriptionInfo, newName: String) {
        if (subInfo.displayName == newName) {
            return
        }
        renameMutableMap[subInfo.subscriptionId] = newName
        Log.d(
            TAG,
            "renameMutableMap add ${subInfo.subscriptionId} & $newName into: $renameMutableMap"
        )
    }

    fun getSubscriptionInfoDisplayName(subInfo: SubscriptionInfo): String {
        return renameMutableMap[subInfo.subscriptionId] ?: subInfo.displayName.toString()
    }

    fun addCurrentItemForSelectedSim(){
        userSelectedSubInfoList.addAll(activeSubInfoList)
    }

    fun addItemForSelectedSim(selectedSubInfo: SubscriptionInfo) {
        userSelectedSubInfoList.add(selectedSubInfo)
    }

    fun removeItemForSelectedSim(selectedSubInfo: SubscriptionInfo) {
        if (userSelectedSubInfoList.contains(selectedSubInfo)) {
            userSelectedSubInfoList.remove(selectedSubInfo)
        }
    }

    /**
     * Return the subscriptionInfo which will be removed in the slot during the sim onboarding.
     * If return Null, then no subscriptionInfo will be removed in the slot.
     */
    fun getRemovedSim():SubscriptionInfo?{
        return activeSubInfoList.find { !userSelectedSubInfoList.contains(it) }
    }

    fun handleTogglePsimAction() {
        val canDisablePhysicalSubscription =
            subscriptionManager?.canDisablePhysicalSubscription() == true
        if (targetSubInfo != null && canDisablePhysicalSubscription) {
            // TODO: to support disable case.
            subscriptionManager?.setUiccApplicationsEnabled(
                    targetSubInfo!!.subscriptionId, /*enabled=*/true)
        } else {
            Log.i(TAG, "The device does not support toggling pSIM. It is enough to just "
                    + "enable the removable slot."
            )
        }
    }

    fun startActivatingSim(){
        // TODO: start to activate sim
        callback(SimOnboardingActivity.CALLBACK_FINISH)
    }

    suspend fun startSetupName() {
        withContext(Dispatchers.Default) {
            renameMutableMap.forEach {
                subscriptionManager?.setDisplayName(
                    it.value, it.key,
                    SubscriptionManager.NAME_SOURCE_USER_INPUT
                )
            }
            // next action is SETUP_PRIMARY_SIM
            callback(SimOnboardingActivity.CALLBACK_SETUP_PRIMARY_SIM)
        }
    }

    suspend fun startSetupPrimarySim(context: Context) {
        withContext(Dispatchers.Default) {
            setDefaultVoice(subscriptionManager,targetPrimarySimCalls)
            setDefaultSms(subscriptionManager,targetPrimarySimTexts)
            setDefaultData(
                context,
                subscriptionManager,
                null,
                targetPrimarySimMobileData
            )

            var nonDds = targetNonDds
            Log.d(
                TAG,
                "setAutomaticData: targetNonDds: $nonDds," +
                    " targetPrimarySimAutoDataSwitch: $targetPrimarySimAutoDataSwitch"
            )
            if (nonDds != SubscriptionManager.INVALID_SUBSCRIPTION_ID) {
                val telephonyManagerForNonDds: TelephonyManager? =
                    context.getSystemService(TelephonyManager::class.java)
                        ?.createForSubscriptionId(nonDds)
                setAutomaticData(telephonyManagerForNonDds, targetPrimarySimAutoDataSwitch)
            }

            // no next action, send finish
            callback(SimOnboardingActivity.CALLBACK_FINISH)
        }
    }
}