export function buildMatches(pool) { const matches=[]; for(let index=0;index<pool.length;index+=2) matches.push({left:pool[index],right:pool[index+1]||null,winner:pool[index+1]?null:pool[index]}); return matches; }
export function createBracket(candidates) { return { round:1,pool:[...candidates],matches:buildMatches(candidates),eliminated:[],decisions:[],offset:0 }; }
export function chooseMatch(state,index,side) { const match=state.matches[index]; if(!match?.right||match.winner)return{state,finished:false}; const winner=side==='right'?match.right:match.left,loser=side==='right'?match.left:match.right; const matches=state.matches.map((item,i)=>i===index?{...item,winner}:item); let next={...state,matches,eliminated:[loser,...state.eliminated],decisions:[...state.decisions,{round:state.round,left_id:match.left.id,right_id:match.right.id,winner_id:winner.id}]}; if(matches.every(item=>item.winner)){const pool=matches.map(item=>item.winner);if(pool.length===1)return{state:{...next,pool},finished:true};next={...next,round:state.round+1,pool,matches:buildMatches(pool),offset:0};}return{state:next,finished:false}; }
export function firstOpenMatch(state) { return state.matches.findIndex(match=>match.right&&!match.winner); }