package extract

import (
	"os"

	log "github.com/sirupsen/logrus"
	"github.com/xuri/excelize/v2"
)

// 卫星时间起点 北京时间 2000-01-01 20:00:00
var (
	ReferenceTime2000 = 946728000
)

func (e *Extractor) ExtractAux(auxfile, xlsxfile string) ([]*AuxFrameHead, []*AuxFocalBox, []*AuxPlatform, error) {
	log.Println("extract aux data from", auxfile, "to", xlsxfile)
	os.Remove(xlsxfile)
	if err := createAuxXlsx(xlsxfile); err != nil {
		return nil, nil, nil, err
	}

	f, err := excelize.OpenFile(xlsxfile)
	if err != nil {
		return nil, nil, nil, err
	}

	defer f.Close()

	data, err := os.ReadFile(auxfile)
	if err != nil {
		log.Println("read aux data from", auxfile, "error:", err.Error())
		return nil, nil, nil, err
	}

	var afh []*AuxFrameHead
	var afb []*AuxFocalBox
	var aps []*AuxPlatform

	row := 2
	col := 1
	for i := 0; i < len(data); i += 24 + 128 + 512 {
		if i+24+128+512 > len(data) {
			break
		}
		var head AuxFrameHead
		head.Decode(data[i : i+24])
		l0, _ := head.SaveXlsx(f, col, row)
		afh = append(afh, &head)

		var box AuxFocalBox
		box.Decode(data[i+24 : i+24+128])
		l1, _ := box.SaveXlsx(f, col+l0, row)
		afb = append(afb, &box)

		var plat AuxPlatform
		plat.Decode(data[i+24+128 : i+24+128+512])
		plat.SaveXlsx(f, col+l0+l1, row)
		aps = append(aps, &plat)

		row++
	}

	err = f.Save()
	return afh, afb, aps, err
}