// Notes implements a data structure for reasoning about and rendering
// markdown notes
package notes

import (
	"bytes"
	"fmt"
	"log"
	"os"
	"path/filepath"

	"gitea.gwairfelin.com/max/gonotes/internal/conf"
	"github.com/yuin/goldmark"
)

// Note is the central data structure.  It can be Saved, Rendered and Loaded
// using the Save, Render and LoadNote functions.
type Note struct {
	Title        string
	BodyRendered string
	Body         []byte
}

func fmtPath(path string) string {
	return fmt.Sprintf("%s.%s", path, conf.Conf.Extension)
}

// Save a note to a path derived from the title
func (n *Note) Save() error {
	filename := filepath.Join(conf.Conf.NotesDir, fmtPath(n.Title))
	return os.WriteFile(filename, n.Body, 0600)
}

// Render the markdown content of the note to HTML
func (n *Note) Render() {
	var buf bytes.Buffer
	err := goldmark.Convert(n.Body, &buf)
	if err != nil {
		log.Fatal(err)
	}
	n.BodyRendered = buf.String()
}

// Load a note from the disk. The path is derived from the title
func LoadNote(title string) (*Note, error) {
	filename := filepath.Join(conf.Conf.NotesDir, fmtPath(title))
	body, err := os.ReadFile(filename)
	if err != nil {
		return nil, err
	}
	return &Note{Title: title, Body: body}, nil
}