package render

import (
	"bytes"
	"fmt"
	"os"

	"git.else-if.org/jess/cs-midi-docs/internal/content"
)

func BookMarkdown(tree *content.Node) ([]byte, error) {
	var buf bytes.Buffer
	pages := tree.Flatten()
	for i, page := range pages {
		src, err := os.ReadFile(page.FilePath)
		if err != nil {
			return nil, fmt.Errorf("read %s: %w", page.FilePath, err)
		}
		if i > 0 {
			buf.WriteString("\n\n---\n\n")
		}
		buf.Write(src)
	}
	return buf.Bytes(), nil
}

func BookHTML(tree *content.Node) ([]byte, error) {
	mdBytes, err := BookMarkdown(tree)
	if err != nil {
		return nil, err
	}
	return Markdown(mdBytes)
}