package engine

import (
    "github.com/huichen/wukong/types"
)

type rankerAddDocRequest struct {
    docId  uint64
    fields interface{}
}

type rankerRankRequest struct {
    docs                []types.IndexedDocument
    options             types.RankOptions
    rankerReturnChannel chan rankerReturnRequest
    countDocsOnly       bool
}

type rankerReturnRequest struct {
    docs    types.ScoredDocuments
    numDocs int
}

type rankerRemoveDocRequest struct {
    docId uint64
}

func (engine *Engine) rankerAddDocWorker(shard int) {
    for {
        request := <-engine.rankerAddDocChannels[shard]
        engine.rankers[shard].AddDoc(request.docId, request.fields)
    }
}

func (engine *Engine) rankerRankWorker(shard int) {
    for {
        request := <-engine.rankerRankChannels[shard]
        if request.options.MaxOutputs != 0 {
            request.options.MaxOutputs += request.options.OutputOffset
        }
        request.options.OutputOffset = 0
        outputDocs, numDocs := engine.rankers[shard].Rank(request.docs, request.options, request.countDocsOnly)
        request.rankerReturnChannel <- rankerReturnRequest{docs: outputDocs, numDocs: numDocs}
    }
}

func (engine *Engine) rankerRemoveDocWorker(shard int) {
    for {
        request := <-engine.rankerRemoveDocChannels[shard]
        engine.rankers[shard].RemoveDoc(request.docId)
    }
}