checkpoint 1

internal/parser/factory.go

@@ -0,0 +1,57 @@
+package parser
+
+import (
+	"fmt"
+	"path/filepath"
+)
+
+// NewParser creates a parser based on file extension or content
+func NewParser(filename string) (Parser, error) {
+	// First try by extension
+	ext := filepath.Ext(filename)
+	switch ext {
+	case ".fit":
+		return NewFITParser(), nil
+	case ".tcx":
+		return NewTCXParser(), nil // To be implemented
+	case ".gpx":
+		return NewGPXParser(), nil // To be implemented
+	}
+
+	// If extension doesn't match, detect by content
+	fileType, err := DetectFileTypeFromFile(filename)
+	if err != nil {
+		return nil, fmt.Errorf("failed to detect file type: %w", err)
+	}
+
+	switch fileType {
+	case FIT:
+		return NewFITParser(), nil
+	case TCX:
+		return NewTCXParser(), nil
+	case GPX:
+		return NewGPXParser(), nil
+	default:
+		return nil, fmt.Errorf("unsupported file type: %s", fileType)
+	}
+}
+
+// NewParserFromData creates a parser based on file content
+func NewParserFromData(data []byte) (Parser, error) {
+	fileType := DetectFileTypeFromData(data)
+	
+	switch fileType {
+	case FIT:
+		return NewFITParser(), nil
+	case TCX:
+		return NewTCXParser(), nil
+	case GPX:
+		return NewGPXParser(), nil
+	default:
+		return nil, fmt.Errorf("unsupported file type: %s", fileType)
+	}
+}
+
+// Placeholder implementations (will create these next)
+func NewTCXParser() Parser { return nil }
+func NewGPXParser() Parser { return nil }