package rules

import (
	"context"
	"fmt"
)

// HostnameRule matches URLs based on hostname/domain
type HostnameRule struct {
	Hostname  string           `json:"hostname"`             // Pattern like "example.com" or "*.github.com"
	Archivers []ArchiverConfig `json:"extractors,omitempty"` // Optional: only present on root rules, can be null for child rules (JSON tag kept for backward compatibility)
}

// Matches evaluates if the URL metadata matches the hostname pattern
func (r *HostnameRule) Matches(ctx context.Context, metadata *URLMetadata) ([]ArchiverConfig, error) {
	if r.Hostname == "" {
		return nil, nil
	}

	// Compare domain with pattern
	if matchesPattern(r.Hostname, metadata.Domain) {
		// Return empty slice if Archivers is nil (for child rules in AND/OR)
		if r.Archivers == nil {
			return []ArchiverConfig{}, nil
		}
		return r.Archivers, nil
	}

	return nil, nil
}

// IsValid validates that the rule is properly defined
func (r *HostnameRule) IsValid() error {
	if r.Hostname == "" {
		return fmt.Errorf("hostname rule: matches field is required")
	}
	return nil
}