package de.pheerai.rcdbquery.dsl.params

import de.pheerai.rcdbquery.dataMappings.internal.RcdbParamOption
import de.pheerai.rcdbquery.dataMappings.searchType.SearchType
import de.pheerai.rcdbquery.dsl.RcdbParams

class ParamsCollector {
    private val multiParams: MutableMap<String, List<RcdbParamOption<Any>>> = mutableMapOf()
    private val singleParams: MutableMap<String, RcdbParamOption<Any>> = mutableMapOf()

    fun build() = RcdbParams(buildMulti(), buildSingle())

    /**
     * Creates the Query Params from this builder.
     * If no Search type has been set, this will default to "Coaster"
     */
    private fun buildMulti() = multiParams.apply {
        // Defaults go here, if any
    }
        .filter { it.value.isNotEmpty() }
        .mapValues { e -> e.value.map { o -> o.paramValue.toString() } }
        .let { MultiParams(it) }

    private fun buildSingle() = singleParams.apply {
        putIfAbsent(SearchType.paramKey, SearchType.COASTER)
    }
        .mapValues { e -> e.value.paramValue.toString() }
        .let { SingleParams(it) }

    operator fun set(paramName: String, options: List<RcdbParamOption<Any>>) {
        this.multiParams[paramName] = options
    }

    operator fun set(paramName: String, option: RcdbParamOption<Any>) {
        if (paramName !in singleParams && paramName !in multiParams) {
            this.singleParams[paramName] = option
        } else {
            throw ParamAlreadySetException("Parameter $paramName already set.")
        }
    }

    fun getSingle(paramName: String) = this.multiParams[paramName] ?: this.singleParams[paramName]
    fun getMulti(paramName: String) = this.multiParams[paramName]

    fun keys() = this.multiKeys().plus(singleKeys())
    private fun multiKeys() = this.multiParams.keys.toSet()
    private fun singleKeys() = this.singleParams.keys.toSet()
}