package models

import (
	"crypto/md5"
	"encoding/json"
	"fmt"
	"strings"
	"time"
)

type ImageEditSession struct {
	GUID         string               `json:"guid"`
	SiteID       int64                `json:"siteId"`
	UserID       int64                `json:"userId"`
	BaseUploadID int64                `json:"baseUploadId"`
	ImageExt     string               `json:"imageExt"`
	CreatedAt    time.Time            `json:"createdAt"`
	UpdatedAt    time.Time            `json:"updatedAt"`
	Processors   []ImageEditProcessor `json:"processors"`
}

func (ieh ImageEditSession) PreviewURL() string {
	return fmt.Sprintf("/sites/%v/imageedit/%v/preview/%v", ieh.SiteID, ieh.GUID, ieh.Processors[len(ieh.Processors)-1].VersionID)
}

func (ieh *ImageEditSession) RecalcVersionIDs() {
	for i, p := range ieh.Processors {
		if i == 0 {
			p.SetVersionID("")
		} else {
			p.SetVersionID(ieh.Processors[i-1].VersionID)
		}

		ieh.Processors[i] = p
	}
}

type ImageEditProcessor struct {
	ID    string          `json:"id"`
	Type  string          `json:"type"`
	Props json.RawMessage `json:"props"`

	// VersionID is a unique hash of the particular processor. This includes the version ID of the previous processor,
	// thereby causing a change of one processor to affect the version IDs of processors down the line.
	VersionID string `json:"versionId"`
}

func (ieh *ImageEditProcessor) SetVersionID(previousVersionID string) {
	var sb strings.Builder
	sb.WriteString(ieh.ID)
	sb.WriteString("-")
	sb.WriteString(previousVersionID)
	sb.WriteString("-")
	sb.WriteString(ieh.Type)
	sb.WriteString("-")
	sb.WriteString(string(ieh.Props))
	ieh.VersionID = fmt.Sprintf("%x", md5.Sum([]byte(sb.String())))
}

type CopyUploadProps struct {
	UploadID int64 `json:"uploadId"`
}