package com.amplitude.pluginengagementreactnative

import com.amplitude.core.events.BaseEvent
import com.facebook.react.bridge.ReadableMap

/**
 * Reads an optional numeric field off a JS payload.
 *
 * [ReadableMap]'s primitive getters return unboxed values, so they throw `NoSuchKeyException`
 * when the key is absent or null — unlike `getString`/`getMap`, which are nullable and simply
 * return null. Every primitive read therefore has to be guarded.
 */
private fun ReadableMap.getLongOrNull(key: String): Long? =
    if (hasKey(key) && !isNull(key)) getDouble(key).toLong() else null

/**
 * Maps a JS event payload onto the [BaseEvent] the engagement SDK consumes.
 *
 * Returns null when the payload has no `event_type`, the one field we can't forward without.
 * Everything else is optional: events reaching the plugin have not been through the analytics
 * pipeline yet, so `event_id` in particular is routinely absent.
 */
internal fun readableMapToBaseEvent(event: ReadableMap): BaseEvent? {
    val baseEvent = BaseEvent()
    baseEvent.eventType = event.getString("event_type") ?: return null
    baseEvent.eventId = event.getLongOrNull("event_id")
    baseEvent.platform = event.getString("platform")
    baseEvent.osName = event.getString("os_name")
    baseEvent.osVersion = event.getString("os_version")
    baseEvent.eventProperties = event.getMap("event_properties")?.toHashMap()?.toMutableMap()
    baseEvent.groupProperties = event.getMap("group_properties")?.toHashMap()?.toMutableMap()
    baseEvent.groups = event.getMap("groups")?.toHashMap()?.toMutableMap()
    baseEvent.userProperties = event.getMap("user_properties")?.toHashMap()?.toMutableMap()
    return baseEvent
}