package main

import (
	"time"

	"github.com/gocolly/colly"
)

func (app *App) Scrape(shops []Shop) {

	wait := make(chan bool)
	count := 0

	for _, shop := range shops {

		go app.ScrapeShop(shop, wait)
		count++

	}

	// Wait until all go routines finished
	for i := 0; i < count; i++ {
		<-wait
	}
}

func (app *App) ScrapeShop(shop Shop, wait chan bool) {
	var W []Angebot
	var err error

	// retry on error
	for i := 1; i < 4; i++ {
		W = app.ScrapeHTML(shop)

		W = sanitize_offer(W, shop, i)

		if len(W) >= 1 {
			break
		}
	}

	// if no results, return early
	if len(W) == 0 {
		wait <- true
		return

	}

	err = app.save_offer(W)
	if err != nil {
		shop.error_msg = err.Error()
		shop.Warn("Saving offers failed.")
	}
	err = app.remove_expired(W, shop)
	if err != nil {
		shop.error_msg = err.Error()
		shop.Warn("Removing expired offers failed.")
	}

	wait <- true
}

func (app *App) ScrapeHTML(shop Shop) []Angebot {

	switch shop.Name {
	case "Bottleworld":
		return app.ScrapeBottleWord(shop)
	case "MC Whisky":
		return app.ScrapeMCWhisky(shop)
	case "Rum & Co":
		return app.ScrapeRumundCo(shop)
	case "Whic":
		return app.ScrapeWhic(shop)
	case "Whisky.de":
		return app.ScrapeWhiskyde(shop)
	case "Whiskysite":
		return app.ScrapeWhiskysitenl(shop)
	case "Whisky World":
		return app.ScrapeWhiskyworld(shop)
	case "Whiskyzone":
		return app.ScrapeWhiskyzone(shop)
	case "Drankdozijn":
		return app.ScrapeDrankdozijn(shop)
	default:
		shop.Warn("No Crawler")
	}

	return []Angebot{}
}

/*
 * Sets the crawler config.
 */
func (app *App) customCollector(allowed_urls []string) *colly.Collector {
	c := colly.NewCollector(
		colly.UserAgent(app.Config.UserAgent),
		colly.AllowedDomains(allowed_urls...),
	)
	c.IgnoreRobotsTxt = app.Config.IgnoreRobotsTXT

	c.Limit(&colly.LimitRule{
		DomainGlob:  "*",
		RandomDelay: time.Duration(app.Config.Delay) * time.Second,
	})

	return c
}