package alert

import (
	"context"
	"os"
	"strconv"
	"time"

	"git.dev.m-and-m.ovh/mderasse/tesla/api"

	log "github.com/sirupsen/logrus"
)

var apiClient *api.Client
var alert = 0

// Init will initialize telegram bot.
func Init(alertChan chan api.Availability) {
	log.Info("Starting alert ticker")

	var err error
	apiClient, err = api.NewClient()
	if err != nil {
		log.Fatalf("Fail to instantiate the HTTP Client. Error: %s", err.Error())
	}

	priceAlertStr := os.Getenv("PRICE_ALERT")
	if priceAlertStr != "" {
		PriceAlert, err = strconv.ParseInt(priceAlertStr, 10, 64)
		if err != nil {
			log.Fatalf("invalid configuration. PRICE_ALERT environement variable should be an integer.")
		}
	}

	// define an interval and the ticker for this interval
	interval := time.Duration(5) * time.Second
	// create a new Ticker
	tk := time.NewTicker(interval)

	resetAlert := 0
	for range tk.C {
		if alert > 10 {
			alert = 0
			resetAlert = 10
			continue
		}

		if resetAlert != 0 {
			resetAlert--
			continue
		}

		checkPrice(alertChan)
	}
}

func checkPrice(alertChan chan api.Availability) {
	log.Info("Ticker - Checking price")

	availabilities, err := apiClient.GetAvailabilities(context.Background(), &api.AvailabilityParams{
		Query: carFilter,
		Count: 1,
	})
	if err != nil {
		log.Warnf("Fail to contact API. Error: %s", err.Error())
		return
	}

	if availabilities.Results[0].Price < PriceAlert {
		log.Info("Launching an alert !")
		alertChan <- availabilities.Results[0]
		alert++
	}
}