// Package exporters provides implementations of the Exporter interface
// for converting Articulate Rise courses into various file formats.
package exporters
import (
"bytes"
"fmt"
"html"
"os"
"strings"
"github.com/kjanat/articulate-parser/internal/interfaces"
"github.com/kjanat/articulate-parser/internal/models"
"github.com/kjanat/articulate-parser/internal/services"
"golang.org/x/text/cases"
"golang.org/x/text/language"
)
// HTMLExporter implements the Exporter interface for HTML format.
// It converts Articulate Rise course data into a structured HTML document.
type HTMLExporter struct {
// htmlCleaner is used to convert HTML content to plain text when needed
htmlCleaner *services.HTMLCleaner
}
// NewHTMLExporter creates a new HTMLExporter instance.
// It takes an HTMLCleaner to handle HTML content conversion when plain text is needed.
//
// Parameters:
// - htmlCleaner: Service for cleaning HTML content in course data
//
// Returns:
// - An implementation of the Exporter interface for HTML format
func NewHTMLExporter(htmlCleaner *services.HTMLCleaner) interfaces.Exporter {
return &HTMLExporter{
htmlCleaner: htmlCleaner,
}
}
// Export exports a course to HTML format.
// It generates a structured HTML document from the course data
// and writes it to the specified output path.
//
// Parameters:
// - course: The course data model to export
// - outputPath: The file path where the HTML content will be written
//
// Returns:
// - An error if writing to the output file fails
func (e *HTMLExporter) Export(course *models.Course, outputPath string) error {
var buf bytes.Buffer
// Write HTML document structure
buf.WriteString("\n")
buf.WriteString("\n")
buf.WriteString("\n")
buf.WriteString(" \n")
buf.WriteString(" \n")
buf.WriteString(fmt.Sprintf(" %s\n", html.EscapeString(course.Course.Title)))
buf.WriteString(" \n")
buf.WriteString("\n")
buf.WriteString("\n")
// Write course header
buf.WriteString(fmt.Sprintf(" \n %s
\n", html.EscapeString(course.Course.Title)))
if course.Course.Description != "" {
buf.WriteString(fmt.Sprintf(" %s
\n", course.Course.Description))
}
buf.WriteString(" \n\n")
// Add metadata section
buf.WriteString(" \n")
buf.WriteString(" Course Information
\n")
buf.WriteString(" \n")
buf.WriteString(fmt.Sprintf(" - Course ID: %s
\n", html.EscapeString(course.Course.ID)))
buf.WriteString(fmt.Sprintf(" - Share ID: %s
\n", html.EscapeString(course.ShareID)))
buf.WriteString(fmt.Sprintf(" - Navigation Mode: %s
\n", html.EscapeString(course.Course.NavigationMode)))
if course.Course.ExportSettings != nil {
buf.WriteString(fmt.Sprintf(" - Export Format: %s
\n", html.EscapeString(course.Course.ExportSettings.Format)))
}
buf.WriteString("
\n")
buf.WriteString(" \n\n")
// Process lessons
lessonCounter := 0
for _, lesson := range course.Course.Lessons {
if lesson.Type == "section" {
buf.WriteString(fmt.Sprintf(" \n\n", html.EscapeString(lesson.Title)))
continue
}
lessonCounter++
buf.WriteString(fmt.Sprintf(" \n Lesson %d: %s
\n", lessonCounter, html.EscapeString(lesson.Title)))
if lesson.Description != "" {
buf.WriteString(fmt.Sprintf(" %s
\n", lesson.Description))
}
// Process lesson items
for _, item := range lesson.Items {
e.processItemToHTML(&buf, item)
}
buf.WriteString(" \n\n")
}
buf.WriteString("\n")
buf.WriteString("\n")
return os.WriteFile(outputPath, buf.Bytes(), 0644)
}
// GetSupportedFormat returns the format name this exporter supports
// It indicates the file format that the HTMLExporter can generate.
//
// Returns:
// - A string representing the supported format ("html")
func (e *HTMLExporter) GetSupportedFormat() string {
return "html"
}
// getDefaultCSS returns basic CSS styling for the HTML document
func (e *HTMLExporter) getDefaultCSS() string {
return `
body {
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
line-height: 1.6;
color: #333;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background-color: #f9f9f9;
}
header {
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
color: white;
padding: 2rem;
border-radius: 10px;
margin-bottom: 2rem;
box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
header h1 {
margin: 0;
font-size: 2.5rem;
font-weight: 300;
}
.course-description {
margin-top: 1rem;
font-size: 1.1rem;
opacity: 0.9;
}
.course-info {
background: white;
padding: 1.5rem;
border-radius: 8px;
margin-bottom: 2rem;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.course-info h2 {
margin-top: 0;
color: #4a5568;
border-bottom: 2px solid #e2e8f0;
padding-bottom: 0.5rem;
}
.course-info ul {
list-style: none;
padding: 0;
}
.course-info li {
margin: 0.5rem 0;
padding: 0.5rem;
background: #f7fafc;
border-radius: 4px;
}
.course-section {
background: #4299e1;
color: white;
padding: 1.5rem;
border-radius: 8px;
margin: 2rem 0;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.course-section h2 {
margin: 0;
font-weight: 400;
}
.lesson {
background: white;
padding: 2rem;
border-radius: 8px;
margin: 2rem 0;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
border-left: 4px solid #4299e1;
}
.lesson h3 {
margin-top: 0;
color: #2d3748;
font-size: 1.5rem;
}
.lesson-description {
margin: 1rem 0;
padding: 1rem;
background: #f7fafc;
border-radius: 4px;
border-left: 3px solid #4299e1;
}
.item {
margin: 1.5rem 0;
padding: 1rem;
border-radius: 6px;
background: #fafafa;
border: 1px solid #e2e8f0;
}
.item h4 {
margin-top: 0;
color: #4a5568;
font-size: 1.2rem;
text-transform: capitalize;
}
.text-item {
background: #f0fff4;
border-left: 3px solid #48bb78;
}
.list-item {
background: #fffaf0;
border-left: 3px solid #ed8936;
}
.knowledge-check {
background: #e6fffa;
border-left: 3px solid #38b2ac;
}
.multimedia-item {
background: #faf5ff;
border-left: 3px solid #9f7aea;
}
.interactive-item {
background: #fff5f5;
border-left: 3px solid #f56565;
}
.unknown-item {
background: #f7fafc;
border-left: 3px solid #a0aec0;
}
.answers {
margin: 1rem 0;
}
.answers h5 {
margin: 0.5rem 0;
color: #4a5568;
}
.answers ol {
margin: 0.5rem 0;
padding-left: 1.5rem;
}
.answers li {
margin: 0.3rem 0;
padding: 0.3rem;
}
.correct-answer {
background: #c6f6d5;
border-radius: 3px;
font-weight: bold;
}
.correct-answer::after {
content: " ✓";
color: #38a169;
}
.feedback {
margin: 1rem 0;
padding: 1rem;
background: #edf2f7;
border-radius: 4px;
border-left: 3px solid #4299e1;
font-style: italic;
}
.media-info {
background: #edf2f7;
padding: 1rem;
border-radius: 4px;
margin: 0.5rem 0;
}
.media-info strong {
color: #4a5568;
}
hr {
border: none;
height: 2px;
background: linear-gradient(to right, #667eea, #764ba2);
margin: 2rem 0;
border-radius: 1px;
}
ul {
padding-left: 1.5rem;
}
li {
margin: 0.5rem 0;
}
`
}
// processItemToHTML converts a course item into HTML format
// and appends it to the provided buffer. It handles different item types
// with appropriate HTML formatting.
//
// Parameters:
// - buf: The buffer to write the HTML content to
// - item: The course item to process
func (e *HTMLExporter) processItemToHTML(buf *bytes.Buffer, item models.Item) {
switch strings.ToLower(item.Type) {
case "text":
e.processTextItem(buf, item)
case "list":
e.processListItem(buf, item)
case "knowledgecheck":
e.processKnowledgeCheckItem(buf, item)
case "multimedia":
e.processMultimediaItem(buf, item)
case "image":
e.processImageItem(buf, item)
case "interactive":
e.processInteractiveItem(buf, item)
case "divider":
e.processDividerItem(buf)
default:
e.processUnknownItem(buf, item)
}
}
// processTextItem handles text content with headings and paragraphs
func (e *HTMLExporter) processTextItem(buf *bytes.Buffer, item models.Item) {
buf.WriteString(" \n")
buf.WriteString("
Text Content
\n")
for _, subItem := range item.Items {
if subItem.Heading != "" {
fmt.Fprintf(buf, "
%s
\n", subItem.Heading)
}
if subItem.Paragraph != "" {
fmt.Fprintf(buf, "
%s
\n", subItem.Paragraph)
}
}
buf.WriteString("
\n")
buf.WriteString("
List
\n")
buf.WriteString("
\n")
for _, subItem := range item.Items {
if subItem.Paragraph != "" {
cleanText := e.htmlCleaner.CleanHTML(subItem.Paragraph)
fmt.Fprintf(buf, " - %s
\n", html.EscapeString(cleanText))
}
}
buf.WriteString("
\n")
buf.WriteString("
\n")
buf.WriteString("
Knowledge Check
\n")
for _, subItem := range item.Items {
if subItem.Title != "" {
fmt.Fprintf(buf, "
Question: %s
\n", subItem.Title)
}
if len(subItem.Answers) > 0 {
e.processAnswers(buf, subItem.Answers)
}
if subItem.Feedback != "" {
fmt.Fprintf(buf, "
Feedback: %s
\n", subItem.Feedback)
}
}
buf.WriteString("
\n")
buf.WriteString("
Media Content
\n")
for _, subItem := range item.Items {
if subItem.Title != "" {
fmt.Fprintf(buf, "
%s
\n", subItem.Title)
}
if subItem.Media != nil {
if subItem.Media.Video != nil {
buf.WriteString("
\n")
}
}
if subItem.Caption != "" {
fmt.Fprintf(buf, "
%s
\n", subItem.Caption)
}
}
buf.WriteString("
\n")
buf.WriteString("
Image
\n")
for _, subItem := range item.Items {
if subItem.Media != nil && subItem.Media.Image != nil {
buf.WriteString("
\n")
}
if subItem.Caption != "" {
fmt.Fprintf(buf, "
%s
\n", subItem.Caption)
}
}
buf.WriteString("
\n")
buf.WriteString("
Interactive Content
\n")
for _, subItem := range item.Items {
if subItem.Title != "" {
fmt.Fprintf(buf, "
%s
\n", subItem.Title)
}
if subItem.Paragraph != "" {
fmt.Fprintf(buf, "
%s
\n", subItem.Paragraph)
}
}
buf.WriteString("
\n\n")
}
// processUnknownItem handles unknown or unsupported item types
func (e *HTMLExporter) processUnknownItem(buf *bytes.Buffer, item models.Item) {
if len(item.Items) > 0 {
buf.WriteString(" \n")
caser := cases.Title(language.English)
fmt.Fprintf(buf, "
%s Content
\n", caser.String(item.Type))
for _, subItem := range item.Items {
e.processGenericSubItem(buf, subItem)
}
buf.WriteString(" \n\n")
}
}
// processGenericSubItem processes sub-items for unknown types
func (e *HTMLExporter) processGenericSubItem(buf *bytes.Buffer, subItem models.SubItem) {
if subItem.Title != "" {
fmt.Fprintf(buf, " %s
\n", subItem.Title)
}
if subItem.Paragraph != "" {
fmt.Fprintf(buf, " %s
\n", subItem.Paragraph)
}
}
// processAnswers processes answer choices for quiz questions
func (e *HTMLExporter) processAnswers(buf *bytes.Buffer, answers []models.Answer) {
buf.WriteString(" \n")
buf.WriteString("
Answers:
\n")
buf.WriteString("
\n")
for _, answer := range answers {
cssClass := ""
if answer.Correct {
cssClass = " class=\"correct-answer\""
}
fmt.Fprintf(buf, " %s\n", cssClass, html.EscapeString(answer.Title))
}
buf.WriteString("
\n")
buf.WriteString("