package cif

import (
	"strconv"

	"git.fjla.uk/owlboard/go-types/pkg/database"
	"git.fjla.uk/owlboard/go-types/pkg/upstreamApi"
	"git.fjla.uk/owlboard/timetable-mgr/helpers"
	"git.fjla.uk/owlboard/timetable-mgr/log"
	"go.uber.org/zap"
)

func ConvertServiceType(input *upstreamApi.JsonScheduleV1, vstp bool) (*database.Service, error) {
	output := database.Service{
		//TransactionType:   input.TransactionType,
		StpIndicator:      input.CifStpIndicator,
		Operator:          input.AtocCode,
		TrainUid:          input.CifTrainUid,
		Headcode:          input.ScheduleSegment.SignallingId,
		PowerType:         input.ScheduleSegment.CifPowerType,
		PlanSpeed:         parseSpeed(&input.ScheduleSegment.CifSpeed),
		ScheduleStartDate: ParseCifDate(&input.ScheduleStartDate, "start"),
		ScheduleEndDate:   ParseCifDate(&input.ScheduleEndDate, "end"),
		ServiceDetail:     generateServiceDetail(&input.ScheduleSegment.CifTrainClass, &input.ScheduleSegment.SignallingId, &input.ScheduleSegment.CifCateringCode, &input.ScheduleSegment.CifSleepers, vstp),
		DaysRun:           parseDaysRun(&input.ScheduleDaysRun),
		Stops:             parseStops(&input.ScheduleSegment.ScheduleLocation),
	}

	return &output, nil
}

// Converts CifSpeed input string to an int32, automatically corrects VSTP speeds which are not actual speed values
func parseSpeed(CIFSpeed *string) int32 {
	if CIFSpeed == nil {
		return 0
	}
	if *CIFSpeed == "" {
		return int32(0)
	}
	actualSpeed, exists := helpers.SpeedMap[*CIFSpeed]
	if !exists {
		actualSpeed = *CIFSpeed
	}

	speed, err := strconv.ParseInt(actualSpeed, 10, 32)
	if err != nil {
		log.Warn("Unable to parse speed", zap.String("input-value", *CIFSpeed))
		return int32(0)
	}
	return int32(speed)
}

// Not tested
func parseStops(input *[]upstreamApi.CifScheduleLocation) []database.Stop {
	output := make([]database.Stop, 0, len(*input))

	for _, item := range *input {
		stop := database.Stop{
			PublicDeparture: item.PublicDeparture,
			PublicArrival:   item.PublicArrival,
			WttDeparture:    item.Departure,
			WttArrival:      item.Arrival,
			Pass:            item.Pass,
			Platform:        item.Platform,
			ArrLine:         item.Path,
			DepLine:         item.Line,
			Tiploc:          item.TiplocCode,
			IsPublic:        isPublic(&item),
		}

		output = append(output, stop)
	}

	return output
}

// Ascertains whether a given location is a public stop or not
func isPublic(input *upstreamApi.CifScheduleLocation) bool {
	if input.PublicArrival == "" && input.PublicDeparture == "" {
		return false
	}
	return true
}

// Generates a ServiceDetail struct based on the input
func generateServiceDetail(
	cifTrainClass, signallingId,
	cateringCode, sleepers *string,
	vstp bool,
) database.ServiceDetail {
	return database.ServiceDetail{
		FirstClass: hasFirstClass(cifTrainClass, signallingId),
		Catering:   hasCatering(cateringCode),
		Sleeper:    hasSleeper(sleepers),
		Vstp:       vstp,
	}
}

// Ascertains whether the service offers first class
func hasFirstClass(input, signallingId *string) bool {
	if input == nil || signallingId == nil {
		return false
	}

	// Handle non passenger headcodes and ensure first class is not shown as available
	firstChar := (*signallingId)[0]
	if firstChar == '3' || firstChar == '4' || firstChar == '5' || firstChar == '6' || firstChar == '7' || firstChar == '8' || firstChar == '0' {
		return false
	}

	return *input != "S"
}

// Ascertains whether the service offers catering
func hasCatering(input *string) bool {
	if input == nil {
		return false
	}
	return *input != ""
}

// Ascertains whether the service offers sleeping berths
func hasSleeper(input *string) bool {
	if input == nil {
		return false
	}
	return *input != ""
}