// ingestion/internal/wiki/log.go
package wiki

import (
	"fmt"
	"github.com/mathiasbq/hyperguild/ingestion/internal/brainfs"
	"strings"
)

// AppendLog appends one ingestion record to brain/log.md.
func AppendLog(brainDir, source string, pages, warnings []string, date string) error {
	var sb strings.Builder
	fmt.Fprintf(&sb, "## %s — ingest\n\n", date)
	fmt.Fprintf(&sb, "- **Source:** %s\n", source)
	if len(pages) > 0 {
		sb.WriteString("- **Pages written:**\n")
		for _, p := range pages {
			fmt.Fprintf(&sb, "  - %s\n", p)
		}
	}
	if len(warnings) > 0 {
		sb.WriteString("- **Warnings:**\n")
		for _, w := range warnings {
			fmt.Fprintf(&sb, "  - %s\n", w)
		}
	}
	sb.WriteString("\n")

	// Appended through the brain root, never through a symlink (#158).
	bfs, err := brainfs.Open(brainDir)
	if err != nil {
		return fmt.Errorf("open brain: %w", err)
	}
	defer func() { _ = bfs.Close() }()
	if err := bfs.AppendRegular("log.md", []byte(sb.String())); err != nil {
		return fmt.Errorf("write log: %w", err)
	}
	return nil
}