package fetcher

import(
	"project.hechon.fr/internal/config"
	"log"
	"net/http"
	"github.com/PuerkitoBio/goquery"
	"strconv"
	"strings"
	"fmt"
)

func FetchChapter(cfg *config.Cfg , searchedChapter string) ( error){

	url := "https://www.biblegateway.com/passage/?search=" + cfg.Book.Name + "%20" + searchedChapter +"&version=" + cfg.Book.Version

	res, err := http.Get(url)
	if err != nil {
		log.Printf("can’t get %s : %v\n", url, err)
		return err
	}

	defer res.Body.Close()
	if res.StatusCode != http.StatusOK {
		log.Printf("error %v\n", res.Status)
		return err
	}

	doc, err := goquery.NewDocumentFromReader(res.Body)
	if err != nil {
		log.Printf("error reading the http response: %v\n", err)
		return  err
	}

	chapterNum, err := strconv.Atoi(searchedChapter)
	if err != nil{
		log.Printf("searched chapter %v is not a valid number - %v", searchedChapter, err)	
	}

	chapterText := config.Chapter{
		Number: chapterNum,
			}

	replacer := strings.NewReplacer(
				"L'Éternel", "YAHWEH",
				"l'Éternel", "YAHWEH",
				"Éternel", "YAHWEH",
			)

	 doc.Find(".verse > span").Each(func(i int, s *goquery.Selection){
	/**********************************************************************************/
	/**** verses are marked by an .verse class. Inside the text is in a span and  *****/
	/****    begin either by the chapter number (first verse), or by the verse    *****/
	/****    (the other verses). With that the code is straight forward.          *****/
	/**********************************************************************************/
		rawText := s.Text()
		verse:= ""
		if i == 0 {
			verse, _ = strings.CutPrefix(rawText, searchedChapter )
		}else{

			verse, _ = strings.CutPrefix(rawText, strconv.Itoa(i+1))
		}
		verse = replacer.Replace(verse)
		chapterText.Verses = append(chapterText.Verses, strings.TrimSpace(verse))
	})

	chapterText = StripAlternativeVersification(chapterText)
	cfg.Book.Chapters = append(cfg.Book.Chapters, chapterText)
	
	err= SaveChapter(*cfg, &chapterText)
	if err != nil{
		log.Printf("Error saving chapter %v in yaml format.", chapterNum)
		return fmt.Errorf("Error saving chapter %v in yaml format.", chapterNum)
	}


	return   nil
}


func FetchBook (cfg *config.Cfg)  error{

	chapterNum, exist :=  cfg.BookList[cfg.Book.Name]

	if !exist {
		log.Printf("%v is not a Bible book or has not been inserted yet.", cfg.Book.Name)
		return fmt.Errorf("%v is not a Bible book or has not been inserted yet.", cfg.Book.Name)
	}

	for i:= 1 ; i <= chapterNum ; i++{
		err := FetchChapter(cfg, strconv.Itoa(i)) 
		if err != nil {
			log.Printf("Warning : chapter %v has not been fetched: %v", i, err)
			continue
		}
	}
	return nil

}