package table

import (
	"fmt"

	"git.tuxpa.in/a/card_id/common/data"
	"lukechampine.com/frand"
)

// a table is a collection of results

type Table struct {
	raw data.Results

	TotalProbability float64
}

func New(r data.Results) *Table {
	out := &Table{}
	out.raw = r

	for _, v := range out.raw {
		out.TotalProbability = out.TotalProbability + v.Rate
	}

	return out
}

func (t *Table) RandomResult() data.Result {
	selector := frand.Float64() * t.TotalProbability
	sofar := 0.0
	for _, v := range t.raw {
		sofar = sofar + v.Rate
		if sofar >= selector-0.000000001 {
			return v
		}
	}
	return data.Result{
		Name: fmt.Sprintf("please report this bug: %v", selector),
		Rate: selector,
	}
}