package pis

import (
	"fmt"
	"sort"
	"strings"

	"gopkg.in/yaml.v3"
)

// Process the YAML data to a struct
func processYaml(yamlStr string) (*[]PisData, error) {
	var pis []PisData

	// Unmarshal the YAML data into a slice of PisData
	err := yaml.Unmarshal([]byte(yamlStr), &pis)
	if err != nil {
		return nil, fmt.Errorf("failed to unmarshal YAML: %v", err)
	}

	// Perform deduplication on the entire pis slice
	err = deduplicateCodes(&pis)
	if err != nil {
		return nil, err
	}

	return &pis, nil
}

// Deduplicate data in place and return error if failed
func deduplicateCodes(pis *[]PisData) error {
	uniqueStops := make(map[string]bool)
	var dedupedPis []PisData

	for _, data := range *pis {
		stopsKey := stopsToString(data.Stops)

		// If stopsKey does not exist, add to map
		if _, exists := uniqueStops[stopsKey]; !exists {
			uniqueStops[stopsKey] = true
			dedupedPis = append(dedupedPis, data)
		}
	}

	*pis = dedupedPis
	return nil
}

func stopsToString(stops []string) string {
	sort.Strings(stops)
	return strings.Join(stops, ",")
}