refactor: Align with Go conventions and improve maintainability

Renames the `OriginalUrl` field to `OriginalURL` across media models to adhere to Go's common initialisms convention. The `json` tag is unchanged to maintain API compatibility.

Introduces constants for exporter formats (e.g., `FormatMarkdown`, `FormatDocx`) to eliminate the use of magic strings, enhancing type safety and making the code easier to maintain.

Additionally, this commit includes several minor code quality improvements:
- Wraps file-writing errors in exporters to provide more context.
- Removes redundant package-level comments from test files.
- Applies various minor linting fixes throughout the codebase.

internal/config/config_test.go

@@ -1,4 +1,3 @@
-// Package config_test provides tests for the config package.
 package config
 
 import (

internal/exporters/bench_test.go

@@ -1,4 +1,3 @@
-// Package exporters_test provides benchmarks for all exporters.
 package exporters
 
 import (

internal/exporters/docx.go

@@ -69,7 +69,7 @@ func (e *DocxExporter) Export(course *models.Course, outputPath string) error {
 
 	// Ensure output directory exists and add .docx extension
 	if !strings.HasSuffix(strings.ToLower(outputPath), ".docx") {
-		outputPath = outputPath + ".docx"
+		outputPath += ".docx"
 	}
 
 	// Create the file
@@ -198,5 +198,5 @@ func (e *DocxExporter) exportSubItem(doc *docx.Docx, subItem *models.SubItem) {
 // Returns:
 //   - A string representing the supported format ("docx")
 func (e *DocxExporter) SupportedFormat() string {
-	return "docx"
+	return FormatDocx
 }

internal/exporters/docx_test.go

@@ -1,4 +1,3 @@
-// Package exporters_test provides tests for the docx exporter.
 package exporters
 
 import (
@@ -331,7 +330,7 @@ func TestDocxExporter_ComplexCourse(t *testing.T) {
 									Caption: "<p>Watch this introductory video</p>",
 									Media: &models.Media{
 										Video: &models.VideoMedia{
-											OriginalUrl: "https://example.com/intro.mp4",
+											OriginalURL: "https://example.com/intro.mp4",
 											Duration:    300,
 										},
 									},
@@ -359,7 +358,7 @@ func TestDocxExporter_ComplexCourse(t *testing.T) {
 									Caption: "<p>Course overview diagram</p>",
 									Media: &models.Media{
 										Image: &models.ImageMedia{
-											OriginalUrl: "https://example.com/overview.png",
+											OriginalURL: "https://example.com/overview.png",
 										},
 									},
 								},

internal/exporters/factory.go

@@ -1,5 +1,3 @@
-// Package exporters provides implementations of the Exporter interface
-// for converting Articulate Rise courses into various file formats.
 package exporters
 
 import (
@@ -10,6 +8,13 @@ import (
 	"github.com/kjanat/articulate-parser/internal/services"
 )
 
+// Format constants for supported export formats.
+const (
+	FormatMarkdown = "markdown"
+	FormatDocx     = "docx"
+	FormatHTML     = "html"
+)
+
 // Factory implements the ExporterFactory interface.
 // It creates appropriate exporter instances based on the requested format.
 type Factory struct {
@@ -36,11 +41,11 @@ func NewFactory(htmlCleaner *services.HTMLCleaner) interfaces.ExporterFactory {
 // Format strings are case-insensitive (e.g., "markdown", "DOCX").
 func (f *Factory) CreateExporter(format string) (interfaces.Exporter, error) {
 	switch strings.ToLower(format) {
-	case "markdown", "md":
+	case FormatMarkdown, "md":
 		return NewMarkdownExporter(f.htmlCleaner), nil
-	case "docx", "word":
+	case FormatDocx, "word":
 		return NewDocxExporter(f.htmlCleaner), nil
-	case "html", "htm":
+	case FormatHTML, "htm":
 		return NewHTMLExporter(f.htmlCleaner), nil
 	default:
 		return nil, fmt.Errorf("unsupported export format: %s", format)
@@ -50,5 +55,5 @@ func (f *Factory) CreateExporter(format string) (interfaces.Exporter, error) {
 // SupportedFormats returns a list of all supported export formats,
 // including both primary format names and their aliases.
 func (f *Factory) SupportedFormats() []string {
-	return []string{"markdown", "md", "docx", "word", "html", "htm"}
+	return []string{FormatMarkdown, "md", FormatDocx, "word", FormatHTML, "htm"}
 }

internal/exporters/factory_test.go

@@ -1,4 +1,3 @@
-// Package exporters_test provides tests for the exporter factory.
 package exporters
 
 import (

internal/exporters/html.go

@@ -1,5 +1,3 @@
-// Package exporters provides implementations of the Exporter interface
-// for converting Articulate Rise courses into various file formats.
 package exporters
 
 import (
@@ -112,7 +110,10 @@ func (e *HTMLExporter) Export(course *models.Course, outputPath string) error {
 	buf.WriteString("</html>\n")
 
 	// #nosec G306 - 0644 is appropriate for export files that should be readable by others
-	return os.WriteFile(outputPath, buf.Bytes(), 0o644)
+	if err := os.WriteFile(outputPath, buf.Bytes(), 0o644); err != nil {
+		return fmt.Errorf("failed to write HTML file: %w", err)
+	}
+	return nil
 }
 
 // SupportedFormat returns the format name this exporter supports
@@ -121,7 +122,7 @@ func (e *HTMLExporter) Export(course *models.Course, outputPath string) error {
 // Returns:
 //   - A string representing the supported format ("html")
 func (e *HTMLExporter) SupportedFormat() string {
-	return "html"
+	return FormatHTML
 }
 
 // getDefaultCSS returns basic CSS styling for the HTML document.
@@ -390,7 +391,7 @@ func (e *HTMLExporter) processMultimediaItem(buf *bytes.Buffer, item models.Item
 		if subItem.Media != nil {
 			if subItem.Media.Video != nil {
 				buf.WriteString("            <div class=\"media-info\">\n")
-				fmt.Fprintf(buf, "                <p><strong>Video:</strong> %s</p>\n", html.EscapeString(subItem.Media.Video.OriginalUrl))
+				fmt.Fprintf(buf, "                <p><strong>Video:</strong> %s</p>\n", html.EscapeString(subItem.Media.Video.OriginalURL))
 				if subItem.Media.Video.Duration > 0 {
 					fmt.Fprintf(buf, "                <p><strong>Duration:</strong> %d seconds</p>\n", subItem.Media.Video.Duration)
 				}
@@ -411,7 +412,7 @@ func (e *HTMLExporter) processImageItem(buf *bytes.Buffer, item models.Item) {
 	for _, subItem := range item.Items {
 		if subItem.Media != nil && subItem.Media.Image != nil {
 			buf.WriteString("            <div class=\"media-info\">\n")
-			fmt.Fprintf(buf, "                <p><strong>Image:</strong> %s</p>\n", html.EscapeString(subItem.Media.Image.OriginalUrl))
+			fmt.Fprintf(buf, "                <p><strong>Image:</strong> %s</p>\n", html.EscapeString(subItem.Media.Image.OriginalURL))
 			buf.WriteString("            </div>\n")
 		}
 		if subItem.Caption != "" {

internal/exporters/html_test.go

@@ -1,4 +1,3 @@
-// Package exporters_test provides tests for the html exporter.
 package exporters
 
 import (
@@ -270,7 +269,7 @@ func TestHTMLExporter_ProcessMultimediaItem(t *testing.T) {
 				Title: "<p>Video Title</p>",
 				Media: &models.Media{
 					Video: &models.VideoMedia{
-						OriginalUrl: "https://example.com/video.mp4",
+						OriginalURL: "https://example.com/video.mp4",
 						Duration:    120,
 					},
 				},
@@ -315,7 +314,7 @@ func TestHTMLExporter_ProcessImageItem(t *testing.T) {
 			{
 				Media: &models.Media{
 					Image: &models.ImageMedia{
-						OriginalUrl: "https://example.com/image.png",
+						OriginalURL: "https://example.com/image.png",
 					},
 				},
 				Caption: "<p>Image caption</p>",

internal/exporters/markdown.go

@@ -1,5 +1,3 @@
-// Package exporters provides implementations of the Exporter interface
-// for converting Articulate Rise courses into various file formats.
 package exporters
 
 import (
@@ -82,12 +80,15 @@ func (e *MarkdownExporter) Export(course *models.Course, outputPath string) erro
 	}
 
 	// #nosec G306 - 0644 is appropriate for export files that should be readable by others
-	return os.WriteFile(outputPath, buf.Bytes(), 0o644)
+	if err := os.WriteFile(outputPath, buf.Bytes(), 0o644); err != nil {
+		return fmt.Errorf("failed to write markdown file: %w", err)
+	}
+	return nil
 }
 
 // SupportedFormat returns "markdown".
 func (e *MarkdownExporter) SupportedFormat() string {
-	return "markdown"
+	return FormatMarkdown
 }
 
 // processItemToMarkdown converts a course item into Markdown format.
@@ -170,7 +171,7 @@ func (e *MarkdownExporter) processMediaSubItem(buf *bytes.Buffer, subItem models
 // processVideoMedia processes video media content.
 func (e *MarkdownExporter) processVideoMedia(buf *bytes.Buffer, media *models.Media) {
 	if media.Video != nil {
-		fmt.Fprintf(buf, "**Video**: %s\n", media.Video.OriginalUrl)
+		fmt.Fprintf(buf, "**Video**: %s\n", media.Video.OriginalURL)
 		if media.Video.Duration > 0 {
 			fmt.Fprintf(buf, "**Duration**: %d seconds\n", media.Video.Duration)
 		}
@@ -180,7 +181,7 @@ func (e *MarkdownExporter) processVideoMedia(buf *bytes.Buffer, media *models.Me
 // processImageMedia processes image media content.
 func (e *MarkdownExporter) processImageMedia(buf *bytes.Buffer, media *models.Media) {
 	if media.Image != nil {
-		fmt.Fprintf(buf, "**Image**: %s\n", media.Image.OriginalUrl)
+		fmt.Fprintf(buf, "**Image**: %s\n", media.Image.OriginalURL)
 	}
 }
 
@@ -189,7 +190,7 @@ func (e *MarkdownExporter) processImageItem(buf *bytes.Buffer, item models.Item,
 	fmt.Fprintf(buf, "%s Image\n\n", headingPrefix)
 	for _, subItem := range item.Items {
 		if subItem.Media != nil && subItem.Media.Image != nil {
-			fmt.Fprintf(buf, "**Image**: %s\n", subItem.Media.Image.OriginalUrl)
+			fmt.Fprintf(buf, "**Image**: %s\n", subItem.Media.Image.OriginalURL)
 		}
 		if subItem.Caption != "" {
 			caption := e.htmlCleaner.CleanHTML(subItem.Caption)

internal/exporters/markdown_test.go

@@ -1,4 +1,3 @@
-// Package exporters_test provides tests for the markdown exporter.
 package exporters
 
 import (
@@ -188,7 +187,7 @@ func TestMarkdownExporter_ProcessMultimediaItem(t *testing.T) {
 			{
 				Media: &models.Media{
 					Video: &models.VideoMedia{
-						OriginalUrl: "https://example.com/video.mp4",
+						OriginalURL: "https://example.com/video.mp4",
 						Duration:    120,
 					},
 				},
@@ -227,7 +226,7 @@ func TestMarkdownExporter_ProcessImageItem(t *testing.T) {
 			{
 				Media: &models.Media{
 					Image: &models.ImageMedia{
-						OriginalUrl: "https://example.com/image.jpg",
+						OriginalURL: "https://example.com/image.jpg",
 					},
 				},
 				Caption: "<p>Image caption</p>",
@@ -372,7 +371,7 @@ func TestMarkdownExporter_ProcessVideoMedia(t *testing.T) {
 	var buf bytes.Buffer
 	media := &models.Media{
 		Video: &models.VideoMedia{
-			OriginalUrl: "https://example.com/video.mp4",
+			OriginalURL: "https://example.com/video.mp4",
 			Duration:    300,
 		},
 	}
@@ -397,7 +396,7 @@ func TestMarkdownExporter_ProcessImageMedia(t *testing.T) {
 	var buf bytes.Buffer
 	media := &models.Media{
 		Image: &models.ImageMedia{
-			OriginalUrl: "https://example.com/image.jpg",
+			OriginalURL: "https://example.com/image.jpg",
 		},
 	}
 

internal/interfaces/exporter.go

@@ -1,5 +1,3 @@
-// Package interfaces provides the core contracts for the articulate-parser application.
-// It defines interfaces for parsing and exporting Articulate Rise courses.
 package interfaces
 
 import "github.com/kjanat/articulate-parser/internal/models"

internal/interfaces/logger.go

@@ -1,5 +1,3 @@
-// Package interfaces provides the core contracts for the articulate-parser application.
-// It defines interfaces for parsing and exporting Articulate Rise courses.
 package interfaces
 
 import "context"

internal/models/lesson.go

@@ -1,5 +1,3 @@
-// Package models defines the data structures representing Articulate Rise courses.
-// These structures closely match the JSON format used by Articulate Rise.
 package models
 
 // Lesson represents a single lesson or section within an Articulate Rise course.

internal/models/media.go

@@ -1,5 +1,3 @@
-// Package models defines the data structures representing Articulate Rise courses.
-// These structures closely match the JSON format used by Articulate Rise.
 package models
 
 // Media represents a media element that can be either an image or a video.
@@ -23,8 +21,8 @@ type ImageMedia struct {
 	Height int `json:"height,omitempty"`
 	// CrushedKey is the identifier for a compressed version of the image
 	CrushedKey string `json:"crushedKey,omitempty"`
-	// OriginalUrl is the URL to the full-resolution image
+	// OriginalURL is the URL to the full-resolution image
-	OriginalUrl string `json:"originalUrl"`
+	OriginalURL string `json:"originalUrl"`
 	// UseCrushedKey indicates whether to use the compressed version
 	UseCrushedKey bool `json:"useCrushedKey,omitempty"`
 }
@@ -45,6 +43,6 @@ type VideoMedia struct {
 	InputKey string `json:"inputKey,omitempty"`
 	// Thumbnail is the URL to a smaller preview image
 	Thumbnail string `json:"thumbnail,omitempty"`
-	// OriginalUrl is the URL to the source video file
+	// OriginalURL is the URL to the source video file
-	OriginalUrl string `json:"originalUrl"`
+	OriginalURL string `json:"originalUrl"`
 }

internal/models/models_test.go

@@ -1,4 +1,3 @@
-// Package models_test provides tests for the data models.
 package models
 
 import (
@@ -98,7 +97,7 @@ func TestCourseInfo_JSONMarshalUnmarshal(t *testing.T) {
 				Type:        "jpg",
 				Width:       800,
 				Height:      600,
-				OriginalUrl: "https://example.com/image.jpg",
+				OriginalURL: "https://example.com/image.jpg",
 			},
 		},
 	}
@@ -149,7 +148,7 @@ func TestLesson_JSONMarshalUnmarshal(t *testing.T) {
 								URL:         "https://example.com/video.mp4",
 								Type:        "mp4",
 								Duration:    120,
-								OriginalUrl: "https://example.com/video.mp4",
+								OriginalURL: "https://example.com/video.mp4",
 							},
 						},
 					},
@@ -244,7 +243,7 @@ func TestSubItem_JSONMarshalUnmarshal(t *testing.T) {
 				Type:          "png",
 				Width:         400,
 				Height:        300,
-				OriginalUrl:   "https://example.com/subitem.png",
+				OriginalURL:   "https://example.com/subitem.png",
 				CrushedKey:    "crushed-123",
 				UseCrushedKey: true,
 			},
@@ -305,7 +304,7 @@ func TestMedia_JSONMarshalUnmarshal(t *testing.T) {
 			Type:          "jpeg",
 			Width:         1200,
 			Height:        800,
-			OriginalUrl:   "https://example.com/media.jpg",
+			OriginalURL:   "https://example.com/media.jpg",
 			CrushedKey:    "crushed-media",
 			UseCrushedKey: false,
 		},
@@ -336,7 +335,7 @@ func TestMedia_JSONMarshalUnmarshal(t *testing.T) {
 			Poster:      "https://example.com/poster.jpg",
 			Thumbnail:   "https://example.com/thumb.jpg",
 			InputKey:    "input-123",
-			OriginalUrl: "https://example.com/original.mp4",
+			OriginalURL: "https://example.com/original.mp4",
 		},
 	}
 
@@ -363,7 +362,7 @@ func TestImageMedia_JSONMarshalUnmarshal(t *testing.T) {
 		Type:          "gif",
 		Width:         640,
 		Height:        480,
-		OriginalUrl:   "https://example.com/image.gif",
+		OriginalURL:   "https://example.com/image.gif",
 		CrushedKey:    "crushed-gif",
 		UseCrushedKey: true,
 	}
@@ -397,7 +396,7 @@ func TestVideoMedia_JSONMarshalUnmarshal(t *testing.T) {
 		Poster:      "https://example.com/poster.jpg",
 		Thumbnail:   "https://example.com/thumbnail.jpg",
 		InputKey:    "upload-456",
-		OriginalUrl: "https://example.com/original.webm",
+		OriginalURL: "https://example.com/original.webm",
 	}
 
 	// Marshal to JSON

internal/services/app_test.go

@@ -1,4 +1,3 @@
-// Package services_test provides tests for the services package.
 package services
 
 import (
@@ -217,11 +216,9 @@ func TestApp_ProcessCourseFromFile(t *testing.T) {
 				if !contains(err.Error(), tt.expectedError) {
 					t.Errorf("Expected error containing '%s', got '%s'", tt.expectedError, err.Error())
 				}
-			} else {
+			} else if err != nil {
-				if err != nil {
 				t.Errorf("Expected no error, got: %v", err)
 			}
-			}
 		})
 	}
 }
@@ -298,11 +295,9 @@ func TestApp_ProcessCourseFromURI(t *testing.T) {
 				if !contains(err.Error(), tt.expectedError) {
 					t.Errorf("Expected error containing '%s', got '%s'", tt.expectedError, err.Error())
 				}
-			} else {
+			} else if err != nil {
-				if err != nil {
 				t.Errorf("Expected no error, got: %v", err)
 			}
-			}
 		})
 	}
 }
@@ -335,7 +330,7 @@ func TestApp_SupportedFormats(t *testing.T) {
 // contains checks if a string contains a substring.
 func contains(s, substr string) bool {
 	return len(s) >= len(substr) &&
-		(len(substr) == 0 ||
+		(substr == "" ||
 			s == substr ||
 			(len(s) > len(substr) &&
 				(s[:len(substr)] == substr ||

internal/services/html_cleaner.go

@@ -1,5 +1,3 @@
-// Package services provides the core functionality for the articulate-parser application.
-// It implements the interfaces defined in the interfaces package.
 package services
 
 import (

internal/services/html_cleaner_test.go

@@ -1,4 +1,3 @@
-// Package services_test provides tests for the HTML cleaner service.
 package services
 
 import (

internal/services/logger.go

@@ -1,4 +1,3 @@
-// Package services provides the core functionality for the articulate-parser application.
 package services
 
 import (

internal/services/logger_bench_test.go

@@ -1,4 +1,3 @@
-// Package services_test provides benchmarks for the logger implementations.
 package services
 
 import (

internal/services/parser.go

@@ -1,5 +1,3 @@
-// Package services provides the core functionality for the articulate-parser application.
-// It implements the interfaces defined in the interfaces package.
 package services
 
 import (

internal/services/parser_bench_test.go

@@ -1,4 +1,3 @@
-// Package services_test provides benchmarks for the parser service.
 package services
 
 import (

internal/services/parser_context_test.go

@@ -1,4 +1,3 @@
-// Package services_test provides context-aware tests for the parser service.
 package services
 
 import (

internal/services/parser_test.go

@@ -1,4 +1,3 @@
-// Package services_test provides tests for the parser service.
 package services
 
 import (

main_test.go

@@ -1,4 +1,3 @@
-// Package main_test provides tests for the main package utility functions.
 package main
 
 import (