package model

import (
	"encoding/json"
	"math"
	"strconv"
	"strings"
	"time"

	"airlines/pkg/airports"
)

type Sex uint8

const (
	SexUnknown Sex = 0
	SexMale    Sex = 1
	SexFemale  Sex = 2
)

func (s *Sex) UnmarshalJSON(b []byte) error {
	var raw string
	if err := json.Unmarshal(b, &raw); err == nil {
		switch strings.ToLower(strings.TrimSpace(raw)) {
		case "male":
			*s = SexMale
			return nil
		case "female":
			*s = SexFemale
			return nil
		case "", "unknown", "null":
			*s = SexUnknown
			return nil
		}
	}
	// also accept numbers in JSON
	var n int
	if err := json.Unmarshal(b, &n); err == nil {
		*s = Sex(n)
		return nil
	}
	*s = SexUnknown
	return nil
}

func TzFromAirportRecord(a airports.Airport) *time.Location {
	return TzFromOffsetHours(a.Timezone)
}

func TzFromOffsetHours(hours float64) *time.Location {
	minTotal := int(math.Round(hours * 60.0))
	sec := minTotal * 60

	name := fixedZoneNameFromMinutes(minTotal)
	return time.FixedZone(name, sec)
}

func fixedZoneNameFromMinutes(minTotal int) string {
	sign := "+"
	if minTotal < 0 {
		sign = "-"
		minTotal = -minTotal
	}
	h := minTotal / 60
	m := minTotal % 60
	return "UTC" + sign + two(h) + ":" + two(m)
}

func two(x int) string {
	if x < 10 {
		return "0" + strconv.Itoa(x)
	}
	return strconv.Itoa(x)
}