import type { SampleResponse } from "../../content/approach-survey-fixture";

export const sentimentGroup=(score:number):"positive"|"neutral"|"negative"=>
  score>.2?"positive":score<-.2?"negative":"neutral";

/** Filtering precedes every aggregation; a theme counts once per response. */
export function summarizeResponses(input:readonly SampleResponse[],area="all"){
  const records=input.filter(record=>area==="all"||record.area===area);
  const themes=new Map<string,number>();
  const sentiments={positive:0,neutral:0,negative:0};
  const contacts={meeting:0,email:0,phone:0};
  for(const record of records){
    for(const theme of new Set(record.themes))themes.set(theme,(themes.get(theme)??0)+1);
    sentiments[sentimentGroup(record.sentiment)]++;
    contacts[record.contact]++;
  }
  return {records,sentiments,contacts,themes:[...themes.entries()].sort((a,b)=>b[1]-a[1]||a[0].localeCompare(b[0]))};
}