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

import (
	"fmt"
	"os"
	"path/filepath"
	"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")

	logPath := filepath.Join(brainDir, "log.md")
	f, err := os.OpenFile(logPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o644)
	if err != nil {
		return fmt.Errorf("open log: %w", err)
	}
	if _, err = f.WriteString(sb.String()); err != nil {
		f.Close() //nolint:errcheck
		return fmt.Errorf("write log: %w", err)
	}
	return f.Close()
}