package weather

import (
	"encoding/json"
	"io"
	"math"
	"net/http"
	"strconv"
)

func inflect(d float64) string {
	n := math.Abs(d) // убираем минус
	deg := int(n)
	deg = deg % 100   // две последние цифры
	n1 := int(n) % 10 // последняя цифра

	form := ""

	if deg > 10 && deg < 20 {
		form = "градусов"
	} else if n1 > 1 && n1 < 5 {
		form = "градуса"
	} else if n1 == 1 {
		form = "градус"
	} else {
		form = "градусов"
	}

	return form
}

func cond(deg int) string {
	f := ""
	if deg < 0 {
		f = " мороза"
	} else if deg >= 1 {
		f = " тепла"
	}

	return f
}

type Weather struct {
	City string `json:"name"`
	Main struct {
		Temp float32 `json:"temp"`
	} `json:"main"`
	Weather []struct {
		Description string `json:"description"`
	} `json:"weather"`
}

func getWeather(city string) *Weather {
	geo := map[string]string{
		"VLG": "472757",
		"KUM": "539221",
	}
	weatherString := "http://api.openweathermap.org/data/2.5/weather?id=" + geo[city] + "&lang=ru&appid=6f9d925282c57d29a95977d346e2d528&units=metric"
	resp, _ := http.Get(weatherString)

	body, _ := io.ReadAll(resp.Body)

	var weather Weather
	json.Unmarshal(body, &weather)

	return &weather
}

func CompilationWeatherString(city string) string {
	geo := ""
	if city == "KUM" {
		geo = "станице кум*ылженской"
	} else if city == "VLG" {
		geo = "городе волгоград"
	}
	weatherStruct := getWeather(city)

	deg := int(math.Abs(float64(weatherStruct.Main.Temp)))
	degForm := inflect(float64(weatherStruct.Main.Temp))
	condition := cond(deg)

	return "Сейчас в " + geo + " " + strconv.Itoa(deg) + " " + degForm + condition + weatherStruct.Weather[0].Description
}