package valuate

import (
	"fmt"

	"github.com/Knetic/govaluate"
	"github.com/spf13/cast"
)

type (
	Expression = *govaluate.EvaluableExpression
)

func EvalInt32(expression Expression, args ...any) (int32, bool) {
	if expression == nil {
		return 0, false
	}

	// build parameters
	parameters := make(map[string]any)
	for i, arg := range args {
		key := fmt.Sprintf("x%d", i+1)
		parameters[key] = arg
	}

	evaluate, err := expression.Evaluate(parameters)
	if err != nil {
		return 0, false
	}

	result := cast.ToInt32(evaluate)
	return result, true
}

func EvalInt64(expression Expression, args ...any) (int64, bool) {
	if expression == nil {
		return 0, false
	}

	// build parameters
	parameters := make(map[string]any)
	for i, arg := range args {
		key := fmt.Sprintf("x%d", i+1)
		parameters[key] = arg
	}

	evaluate, err := expression.Evaluate(parameters)
	if err != nil {
		return 0, false
	}

	result := cast.ToInt64(evaluate)
	return result, true
}