package main

import (
	"crypto/sha256"
	"fmt"
	"io"
	"os"

	"github.com/barasher/go-exiftool"
)

type File struct {
	Path   string
	SHA256 string
	Time   string
}

type Storage interface {
	Upsert(file *File) error
	LoadByPath(path string) *File
}

func NewFile(path string) *File {
	return &File{Path: path}
}

func (file *File) CalculateSHA256() error {
	f, err := os.Open(file.Path)
	if err != nil {
		return err
	}
	defer f.Close()

	h := sha256.New()
	if _, err := io.Copy(h, f); err != nil {
		return err
	}

	file.SHA256 = fmt.Sprintf("%x", h.Sum(nil))

	return nil
}

func (file *File) SetTime() error {

	et, err := exiftool.NewExiftool()
	if err != nil {
		return err
	}
	defer et.Close()

	fileInfos := et.ExtractMetadata(file.Path)

	for _, fileInfo := range fileInfos {
		if fileInfo.Err != nil {
			fmt.Printf("Error concerning %v: %v\n", fileInfo.File, fileInfo.Err)
			continue
		}

		v, ok := fileInfo.Fields["DateTimeOriginal"]
		if ok {
			t, _ := v.(string)
			file.Time = t
		}
	}

	return nil
}