package util

import (
	"bytes"
	"encoding/json"
	"log"
	"os"
	"slices"

	"gitlab.hamburg.ccc.de/ccchh/spaceapid/types"
)

// ParseTemplate parses the given file and
func ParseTemplate(file string) (resp types.SpaceAPIResponseV14) {

	// Read template file
	template, err := os.ReadFile(file)
	if err != nil {
		log.Fatalln("Failed reading file:", err)
	}

	// Parse JSON
	dec := json.NewDecoder(bytes.NewReader(template))
	dec.DisallowUnknownFields()
	err = dec.Decode(&resp)
	if err != nil {
		log.Fatalln("Could not parse SpaceAPI response template:", err)
	}

	// Check if compatible with v14
	if !slices.Contains(resp.APICompatibility, "14") {
		log.Fatalln("Provided template doesn't specify compatibility with API version 14")
	}

	return
}