package actions

import (
	"bytes"
	"crypto/rand"
	"encoding/hex"
	"log"
	"regexp"

	"tomatentum.net/svg-templater/internal/database"
	"tomatentum.net/svg-templater/pkg/svg"
)

func Create(svgbuf []byte) (svg.TemplateData, error) {
	data := svg.TemplateData{Id: generateId(), TemplateKeys: nil}
	populateKeys(&data, svgbuf)

	_, err := svg.Storage.Create(data.Id, bytes.NewReader(svgbuf))
	if err != nil {
		return svg.TemplateData{}, err
	}

	if err := database.InsertSVG(&data); err != nil {
		return svg.TemplateData{}, err
	}

	return data, nil
}

func populateKeys(data *svg.TemplateData, svgblob []byte) {
	regex := regexp.MustCompile(svg.KeyRegex)
	result := regex.FindAllSubmatch(svgblob, -1)
	templateKeys := make([]string, len(result))

	for i, matches := range result {
		varname := matches[1] // first capture group
		templateKeys[i] = string(varname)
	}
	data.TemplateKeys = templateKeys
	log.Println("Found keys:\n", templateKeys)
}

func generateId() string {
	token := make([]byte, 16)
	if _, err := rand.Read(token); err != nil {
		log.Fatal("Failed to generate Token:\n", err)
		return ""
	}
	return hex.EncodeToString(token)
}