package platepdf

import (
	"fmt"
	"os"

	"printer.backend/internal/model"
)

// Generate builds a PDF of the plate layout using the item's SVG template.
// Requires rsvg-convert on PATH.
func Generate(plate model.Plate, spec model.ItemSpec, itemSVGPath string, preview model.LayoutPreview) ([]byte, error) {
	if !rsvgAvailable() {
		return nil, fmt.Errorf("rsvg-convert not found in PATH (required for PDF export)")
	}

	itemSVG, err := os.ReadFile(itemSVGPath)
	if err != nil {
		return nil, fmt.Errorf("read item svg: %w", err)
	}

	composite, err := BuildCompositeSVG(plate, spec, itemSVG, preview)
	if err != nil {
		return nil, err
	}

	pdf, err := svgToPDFViaRsvg(composite, plate.WidthMM, plate.HeightMM)
	if err != nil {
		return nil, fmt.Errorf("render plate pdf: %w", err)
	}
	return pdf, nil
}