package model

import (
	"errors"

	"gitea.tecamino.com/paadi/pdfmerge/internal/pdf/common"
	"gitea.tecamino.com/paadi/pdfmerge/internal/pdf/core"
)

func getNumberAsFloat(obj core.PdfObject) (float64, error) {
	if fObj, ok := obj.(*core.PdfObjectFloat); ok {
		return float64(*fObj), nil
	}

	if iObj, ok := obj.(*core.PdfObjectInteger); ok {
		return float64(*iObj), nil
	}

	return 0, errors.New("not a number")
}

func isNullObject(obj core.PdfObject) bool {
	if _, isNull := obj.(*core.PdfObjectNull); isNull {
		return true
	} else {
		return false
	}
}

// Convert a list of pdf objects representing floats or integers to a slice of float64 values.
func getNumbersAsFloat(objects []core.PdfObject) ([]float64, error) {
	floats := []float64{}
	for _, obj := range objects {
		val, err := getNumberAsFloat(obj)
		if err != nil {
			return nil, err
		}
		floats = append(floats, val)

	}
	return floats, nil
}

// Cases where expecting an integer, but some implementations actually
// store the number in a floating point format.
func getNumberAsInt64(obj core.PdfObject) (int64, error) {
	if iObj, ok := obj.(*core.PdfObjectInteger); ok {
		return int64(*iObj), nil
	}

	if fObj, ok := obj.(*core.PdfObjectFloat); ok {
		common.Log.Debug("Number expected as integer was stored as float (type casting used)")
		return int64(*fObj), nil
	}

	return 0, errors.New("not a number")
}