package data

import (
	"f1-game/internal/extend/rand"
)

var (
	monsterPoolWeightMap map[int32]*rand.Weight[*MonsterPoolRow]
)

func (p *monsterPoolConfig) OnAfterLoad(_ bool) {
	loadMap := map[int32]*rand.Weight[*MonsterPoolRow]{}

	for poolID, rows := range p.poolIDGroupIDUniMaps {
		weight := rand.NewMapWeight(rows, func(v *MonsterPoolRow) int32 {
			return v.Weight
		})
		loadMap[poolID] = weight
	}

	monsterPoolWeightMap = loadMap
}

func (p *monsterPoolConfig) RandIDList(poolID int32, num int) []int32 {
	weighter, ok := monsterPoolWeightMap[poolID]
	if !ok {
		return nil
	}

	rows := weighter.Select(num)
	if len(rows) == 0 {
		return nil
	}

	ids := make([]int32, len(rows))
	for i, row := range rows {
		ids[i] = row.GroupID
	}

	return ids
}