package platform

import (
	_ "embed"
	"encoding/json"
	"fmt"
	"sort"
	"strings"
)

// The user-supplied fleet number registry is bundled with the API release, so
// labels and search always use the same version. VINs remain the identity key.
// Source workbook, sheet and SHA-256 are recorded alongside the imported rows.
//
//go:embed data/vehicle_numbers.json
var vehicleNumberData []byte

var vehicleNumbers = loadVehicleNumbers(vehicleNumberData)

func loadVehicleNumbers(data []byte) map[string]string {
	var source struct {
		Vehicles []struct {
			VIN    string `json:"vin"`
			Number string `json:"number"`
		} `json:"vehicles"`
	}
	if err := json.Unmarshal(data, &source); err != nil {
		panic(fmt.Errorf("invalid vehicle number registry: %w", err))
	}
	numbers := make(map[string]string, len(source.Vehicles))
	for _, row := range source.Vehicles {
		vin, number := strings.ToUpper(strings.TrimSpace(row.VIN)), strings.TrimSpace(row.Number)
		if len(vin) != 17 || number == "" || numbers[vin] != "" {
			panic("invalid or duplicate VIN in vehicle number registry")
		}
		numbers[vin] = number
	}
	return numbers
}

func vehicleNumber(vin string) string {
	return vehicleNumbers[strings.ToUpper(strings.TrimSpace(vin))]
}

func vehicleNumberVINs(keywords []string, exact bool) []string {
	vins := []string{}
	for vin, number := range vehicleNumbers {
		for _, keyword := range keywords {
			keyword = strings.ToUpper(strings.TrimSpace(keyword))
			if keyword == "" {
				continue
			}
			if exact && strings.EqualFold(number, keyword) || !exact && strings.Contains(strings.ToUpper(number), keyword) {
				vins = append(vins, vin)
				break
			}
		}
	}
	sort.Strings(vins)
	return vins
}