package session

import (
	"fmt"
	"html"
	"os"
	"strings"
)

// ExportHTML writes the active branch as a standalone HTML document.
func (s *Store) ExportHTML(path string) error {
	msgs, err := s.Load()
	if err != nil {
		return err
	}
	var b strings.Builder
	b.WriteString("<!DOCTYPE html><html><head><meta charset=\"utf-8\"><title>")
	title := s.Name()
	if title == "" {
		title = "session"
	}
	b.WriteString(html.EscapeString(title))
	b.WriteString("</title></head><body>\n")
	for _, m := range msgs {
		fmt.Fprintf(&b, "<article data-role=\"%s\"><h2>%s</h2><pre>%s</pre></article>\n",
			html.EscapeString(string(m.Role)),
			html.EscapeString(string(m.Role)),
			html.EscapeString(m.Content))
	}
	b.WriteString("</body></html>\n")
	return os.WriteFile(path, []byte(b.String()), 0o644)
}