package ffmpeg

import (
	"encoding/csv"
	"errors"
	"io"
	"log"
	"os"
	"strconv"
	"stream-poc2/model"
)

func ReadSegmentsCSV(fname string) ([]model.Slice, error) {
	log.Println("read csv:", fname)
	f, err := os.OpenFile(fname, os.O_RDONLY, 0)
	if err != nil {
		log.Println("failed to open CSV:", err)
		return nil, err
	}
	defer func(f *os.File) {
		err := f.Close()
		if err != nil {
			log.Println("Failed to close CSV:", err)
		}
	}(f)

	r := csv.NewReader(f)
	var slices []model.Slice

	for {
		var cols []string
		cols, err = r.Read()
		if err != nil {
			if errors.Is(err, io.EOF) {
				break
			}
			log.Println("failed reading csv row", err)
			return nil, err
		}

		var startTime float64
		var endTime float64
		startTime, err = strconv.ParseFloat(cols[1], 64)
		if err != nil {
			log.Println("Failed to parse float", err)
			return nil, err
		}
		endTime, err = strconv.ParseFloat(cols[2], 64)
		if err != nil {
			log.Println("Failed to parse float", err)
			return nil, err
		}

		slices = append(slices, model.Slice{
			Name:      cols[0],
			StartTime: startTime,
			EndTime:   endTime,
		})
	}

	return slices, nil
}