package renderer
import (
	"log"
	"project.hechon.fr/internal/config"
	"project.hechon.fr/internal/models"
	"html/template"
	"gopkg.in/yaml.v3"
	"os"
	"path"
	"strconv"
	"fmt"
)

func ExtractChapter(cfg *config.Cfg, chapterNum int) (error){
	
	fileName := path.Join(cfg.YamlPath, cfg.Book.Name + strconv.Itoa(chapterNum) + ".yaml")
	file, err := os.Open(fileName)
	if err != nil {
		log.Printf("can’t open %v: %v", fileName, err)
		 return err
	}

	var yamlData models.Yaml 
	if err = yaml.NewDecoder(file).Decode(&yamlData) ; err != nil{
		return err
	}

	log.Printf("%v", yamlData)

	if len(yamlData.PoeticLines) == 0 || len(yamlData.PoeticLines[0].Cola) == 0 {
		return fmt.Errorf("no data in %v", fileName) 
	}

	var psalm models.Psalm
	var currentStrophe models.Strophe

	for i, poeticLine := range yamlData.PoeticLines{
		log.Printf("first line: %v - %v - %v", poeticLine.Who, poeticLine.To, poeticLine.Of)
		if i == 0 {
			currentStrophe = models.Strophe{
				Who: yamlData.PoeticLines[0].Who,
				To: yamlData.PoeticLines[0].To,
				Of: yamlData.PoeticLines[0].Of,
			}
		}
	
		if poeticLine.Who  == currentStrophe.Who && 
	   	   poeticLine.To == currentStrophe.To &&
	   	   poeticLine.Of == currentStrophe.Of {
		   	currentStrophe.Colas = append(currentStrophe.Colas, poeticLine.Cola)
		}else{
			psalm.Strophes = append(psalm.Strophes, currentStrophe)
			currentStrophe = models.Strophe{
        		Who:   poeticLine.Who,
        		To:    poeticLine.To,
        		Of:    poeticLine.Of,
        		Colas: [][]models.Colon{poeticLine.Cola},
			} 
		}

	}

	psalm.Strophes = append(psalm.Strophes, currentStrophe)
	log.Printf("====== %v %v========", psalm.Strophes, chapterNum)

	tmpl := template.Must(template.ParseFiles( "internal/models/index.html", "internal/models/psalm.html"))
	outputFileName := path.Join(cfg.HtmlPath, cfg.Book.Name + strconv.Itoa(chapterNum) + ".html")
	
	outputFile, err := os.Create(outputFileName)
	if err!= nil {
		return fmt.Errorf("can’t create %v", outputFileName)
	}
	defer outputFile.Close()

	
	tmpl.Execute(outputFile, psalm.Strophes)
	log.Printf("%v", psalm)
	return nil



}