package deb822

import (
	"fmt"
	"html/template"
	"io"
	"log"
	"os"
	"regexp"
	"strings"
)

type Package struct {
	Name            string
	Version         string
	Description     string
	LongDescription string
	Depends         []string
	Maintainer      string
	Filename        string
}

var regexpRemove = regexp.MustCompile("(DEVUAN/|DEBIAN/|[0-9]+:)")

var regexpDots = regexp.MustCompilePOSIX("(^[[:blank:]]+.[[:blank:]]*$)")

func NewPackage(s Stanza) (Package, error) {

	var p Package

	if s["Package"] == "" || s["Version"] == "" {
		return p, fmt.Errorf("empty package")
	}

	p.Name = s["Package"]
	p.Version = regexpRemove.ReplaceAllString(s["Version"], "")
	descr := strings.SplitN(s["Description"], "\n", 2)
	p.Description = descr[0]
	if len(descr) > 1 {
		p.LongDescription = regexpDots.ReplaceAllString(descr[1], "")
	}
	p.Maintainer = s["Maintainer"]
	p.Depends = strings.Split(s["Depends"], ",")

	return p, nil

}

func PrintPackage(p Package, templ string, out io.Writer) {

	t, err := template.New("webpage").Parse(templ)

	if err != nil {
		log.Fatal("Error in template")
	}

	t.Execute(out, p)
}

/*Stanza2HtmlPage Render the html webpage of a package and save it in the
/* corresponding "pool" directory.
*/
func Stanza2HtmlPage(s Stanza, templ string, baseDir string) error {

	fname := s["Filename"]
	if fname == "" {
		return fmt.Errorf("No Filename provided")
	}
	p, err := NewPackage(s)
	if err != nil {
		log.Fatal("empty package!!!")
	}
	nameVersion := fmt.Sprintf("%s_%s", p.Name, p.Version)
	fmt.Printf("  nameVersion: %s\n", nameVersion)
	fmt.Printf("  baseDir: %s\n", baseDir)

	fname = regexpRemove.ReplaceAllString(fname, "")
	fmt.Printf("  fname: %s\n", fname)

	/// FIXME!!!! ERROR IN DETECTION OF PACKAGE NAME!!!!
	dirName := fmt.Sprintf("%s/%s", baseDir, strings.Split(fname, nameVersion)[0])

	err = os.MkdirAll(dirName, 0755)
	if err == nil {
		fmt.Printf("  dirName: %s\n  Package: %s\n  Version: %s\n", dirName, p.Name, p.Version)
		htmlFile := fmt.Sprintf("%s%s_%s.html", dirName, p.Name, p.Version)
		fmt.Printf("Creating file: %s\n---------\n", htmlFile)
		if f, err := os.Open(htmlFile); err == nil {
			f.Close()
			fmt.Printf("File %s exists -- skipping\n", htmlFile)
			return err
		}
		file, err := os.Create(htmlFile)
		if err != nil {
			err = fmt.Errorf("Error creating file: %s", err)
			return err
		} else {
			PrintPackage(p, templ, file)
			file.Close()
			return nil
		}
	} else {
		err = fmt.Errorf("Error creating path: %s", err)
		return err
	}

	return nil
}