package loader

import (
	"fmt"
	"io"

	"git.ecogood.org/andreas.schroepfer/excelConverter/pkg/ecalc"
	"git.ecogood.org/andreas.schroepfer/excelConverter/pkg/set"
	"github.com/360EntSecGroup-Skylar/excelize/v2"
)

// XLSX reads the data out of the reader. If conf is nil
// the default configuration is used.
func XLSX(r io.Reader, conf *Conf) (*ecalc.Ecalc, error) {
	eBalance := &ecalc.Ecalc{}
	var errs []error

	if conf == nil {
		conf = DefaultConf()
	}
	xFile, err := excelize.OpenReader(r)
	if err != nil {
		return nil, fmt.Errorf("XLSX.OpenReader: %w", err)
	}
	for _, v := range conf.Values {
		cellValue, err := xFile.GetCellValue(
			xFile.GetSheetName(v.Sheet),
			v.Cell,
		)
		if err != nil {
			errs = append(errs, err)
		}
		switch v.Struct {
		case "CompanyFacts":
			set.Field(&eBalance.CompanyFacts, v.Field, cellValue)
		}
	}
	for _, a := range conf.Areas {
		switch a.Struct {
		case "SupplyFraction":
			for r := a.StartRow; r <= a.EndRow; r++ {
				sf := ecalc.SupplyFraction{}
				for _, c := range a.Cols {
					cellValue, err := xFile.GetCellValue(
						xFile.GetSheetName(a.Sheet),
						fmt.Sprintf("%s%d", c.Col, r),
					)
					if err != nil {
						errs = append(errs, err)
					}
					set.Field(&sf, c.Field, cellValue)
				}
				eBalance.CompanyFacts.SupplyFractions =
					append(
						eBalance.CompanyFacts.SupplyFractions,
						sf)
			}
		case "EmployeesFraction":
			for r := a.StartRow; r <= a.EndRow; r++ {
				ef := ecalc.EmployeesFraction{}
				for _, c := range a.Cols {
					cellValue, err := xFile.GetCellValue(
						xFile.GetSheetName(a.Sheet),
						fmt.Sprintf("%s%d", c.Col, r),
					)
					if err != nil {
						errs = append(errs, err)
					}
					set.Field(&ef, c.Field, cellValue)
				}
				eBalance.CompanyFacts.EmployeesFractions =
					append(
						eBalance.CompanyFacts.EmployeesFractions,
						ef)
			}
		case "IndustrySector":
			for r := a.StartRow; r <= a.EndRow; r++ {
				is := ecalc.IndustrySector{}
				for _, c := range a.Cols {
					cellValue, err := xFile.GetCellValue(
						xFile.GetSheetName(a.Sheet),
						fmt.Sprintf("%s%d", c.Col, r),
					)
					if err != nil {
						errs = append(errs, err)
					}
					set.Field(&is, c.Field, cellValue)
				}
				eBalance.CompanyFacts.IndustrySectors =
					append(
						eBalance.CompanyFacts.IndustrySectors,
						is)
			}
		}

	}
	// TODO: error handling of errs
	return eBalance, nil
}