package xlsx

import (
	"archive/zip"
)

// File is a high level structure providing a slice of Sheet structs
// to the user.
type File struct {
	worksheets     map[string]*zip.File
	referenceTable *RefTable
	styles         *xlsxStyles
	Sheets         []*Sheet          // sheet access by index
	Sheet          map[string]*Sheet // sheet access by name
}


// Create a new File
func NewFile() (file *File) {
	file = &File{};
	file.Sheets = make([]*Sheet, 0, 100)
	file.Sheet = make(map[string]*Sheet)
	return
}

// OpenFile() take the name of an XLSX file and returns a populated
// xlsx.File struct for it.
func OpenFile(filename string) (*File, error) {
	var f *zip.ReadCloser
	f, err := zip.OpenReader(filename)
	if err != nil {
		return nil, err
	}
	return ReadZip(f)
}

// Add a new Sheet, with the provided name, to a File
func (f *File) AddSheet(sheetName string) (sheet *Sheet) {
	sheet = &Sheet{}
	f.Sheets = append(f.Sheets, sheet)
	f.Sheet[sheetName] = sheet
	return sheet
}