package com.applicaster.easytracking.ivw

import com.applicaster.easytracking.ivw.Event.Companion.KET_ROOT_EVENTS
import com.google.gson.JsonDeserializer
import com.google.gson.JsonObject
import com.google.gson.annotations.SerializedName

data class Events(
    @SerializedName(KET_ROOT_EVENTS) val values: List<Event>
)

data class Screen(
    @SerializedName(KEY_EVENT) val name: String?,
    @SerializedName(KEY_CODE) val code: String?,
    @SerializedName(KEY_TRACK_ONCE) val trackOnce: Boolean?): Event()
data class Action(
    @SerializedName(KEY_EVENT) val name: String?,
    @SerializedName(KEY_CODE) val code: String?,
    @SerializedName(KEY_FROM_EVENTS) val sourceEventNames: List<String> = listOf()): Event()

sealed class Event {
    companion object {
        fun createJsonDeserializer(): JsonDeserializer<Event> = JsonDeserializer { json, typeOfT, context ->
            val event = json as JsonObject
            val name = if (event.has(KEY_EVENT)) event.get(KEY_EVENT).asString else null
            val code = if (event.has(KEY_CODE)) event.get(KEY_CODE).asString else null
            return@JsonDeserializer if (event.has(KEY_FROM_EVENTS)) {
                val sourceEventNamesJson = event.get(KEY_FROM_EVENTS).asJsonArray
                val sourceEventNames = sourceEventNamesJson.map {element ->
                    element.asString
                }
                Action(
                    name = name,
                    code = code,
                    sourceEventNames = sourceEventNames
                )
            } else {
                val trackOnce = if (event.has(KEY_TRACK_ONCE))
                    json.get(KEY_TRACK_ONCE).asBoolean
                else null
                Screen(
                    name = name,
                    code = code,
                    trackOnce = trackOnce
                )
            }
        }
        
        const val KET_ROOT_EVENTS = "events"
        const val KEY_EVENT = "event"
        const val KEY_CODE = "code"
        const val KEY_TRACK_ONCE = "track_once"
        const val KEY_FROM_EVENTS = "from_events"
    }
}