SDPTeam15/PolyEvents

package com.github.sdpteam15.polyevents.model.database.remote.adapter


import com.github.sdpteam15.polyevents.helper.HelperFunctions
import com.github.sdpteam15.polyevents.helper.HelperFunctions.toInt
import com.github.sdpteam15.polyevents.helper.HelperFunctions.toLocalDateTime
import com.github.sdpteam15.polyevents.model.database.remote.DatabaseConstant.EventConstant.*
import com.github.sdpteam15.polyevents.model.entity.Event
import com.github.sdpteam15.polyevents.model.entity.Item

/**
 * A class for converting between event entities in our code and
 * documents in the Firebase database. Not unlike the conversion to
 * DTO (Data transfer object) concept.
 *
 * Note: The event icon should probably be stored in Google cloud storage, but this has not yet been
 * done.
 *
 * IMPORTANT: This should be updated whenever we add, remove or update fields of Event.
 */
@Suppress("UNCHECKED_CAST")
object EventAdapter : AdapterInterface<Event> {
    override fun toDocumentWithoutNull(element: Event): HashMap<String, Any?> =
        hashMapOf(
            EVENT_NAME.value to element.eventName,
            EVENT_ORGANIZER.value to element.organizer,
            EVENT_ZONE_ID.value to element.zoneId,
            EVENT_ZONE_NAME.value to element.zoneName,
            EVENT_DESCRIPTION.value to element.description,
            // LocalDateTime instances can be directly stored to the database without need of conversion
            // UPDATE: LocalDateTime will not be stored as a Timestamp instance, instead it will be
            // stored as a hashmap representing the LocalDateTime instance
            EVENT_START_TIME.value to HelperFunctions.localDateTimeToDate(element.startTime),
            EVENT_END_TIME.value to HelperFunctions.localDateTimeToDate(element.endTime),
            EVENT_INVENTORY.value to element.inventory,
            EVENT_TAGS.value to element.tags.toList(),
            EVENT_MAX_SLOTS.value to element.getMaxNumberOfSlots(),
            EVENT_LIMITED.value to element.isLimitedEvent(),
            EVENT_PARTICIPANTS.value to element.getParticipants().toList()
        )

    override fun fromDocument(document: Map<String, Any?>, id: String): Event {
        return Event(
            eventId = id,
            eventName = document[EVENT_NAME.value] as String?,
            organizer = document[EVENT_ORGANIZER.value] as String?,
            zoneName = document[EVENT_ZONE_NAME.value] as String?,
            zoneId = document[EVENT_ZONE_ID.value] as String?,
            description = document[EVENT_DESCRIPTION.value] as String?,
            startTime = document[EVENT_START_TIME.value].toLocalDateTime(),
            endTime = document[EVENT_END_TIME.value].toLocalDateTime(),
            inventory = (document[EVENT_INVENTORY.value] as List<Item>).toMutableList(),
            tags = (document[EVENT_TAGS.value] as List<String>).toMutableList(),
            limitedEvent = document[EVENT_LIMITED.value] as Boolean,
            maxNumberOfSlots = document[EVENT_MAX_SLOTS.value].toInt(),
            participants = (document[EVENT_PARTICIPANTS.value] as List<String>).toMutableSet()
        )
    }
}