package image

import (
	"errors"
	"io"
	"sort"
	"time"
)

var ErrImageNotFound = errors.New("image not found")
var ErrImageTypeNotAllowed = errors.New("the file must be a PNG, JPEG, WEBP, or SVG image")
var ErrImageTooLarge = errors.New("the file exceeds the maximum upload size")

const MaxImageSize int64 = 10485760

var allowedContentTypes = map[string]bool{
	"image/png":     true,
	"image/jpeg":    true,
	"image/webp":    true,
	"image/svg+xml": true,
}

func IsAllowedContentType(contentType string) bool {
	return allowedContentTypes[contentType]
}

func AllowedContentTypes() []string {
	types := make([]string, 0, len(allowedContentTypes))
	for contentType := range allowedContentTypes {
		types = append(types, contentType)
	}
	sort.Strings(types)
	return types
}

type ImageInput struct {
	Content     io.Reader
	Filename    string
	Size        int64
	ContentType string
}

type Image struct {
	ID        uint32    `json:"id"`
	Path      string    `json:"path"`
	ArticleID uint32    `json:"article_id"`
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
}