// lldap-export exports the LLDAP directory as a canonical YAML snapshot
// for use with the validator and migration tools.
package main

import (
	"context"
	"flag"
	"fmt"
	"os"

	"keycape/internal/adapters/lldap"
	"keycape/internal/migration/lldapexport"
	"keycape/internal/server/telemetry"
	"keycape/internal/validator"

	"github.com/rs/zerolog"
)

func main() {
	// Flags.
	url := flag.String("url", "ldap://localhost:389", "LLDAP server URL (ldap:// or ldaps://)")
	bindDN := flag.String("bind-dn", "", "Service account bind DN (required)")
	bindPW := flag.String("bind-pw", "", "Service account password (required)")
	baseDN := flag.String("base-dn", "", "LDAP search base DN (required)")
	output := flag.String("output", "canonical-export.yaml", "Output file path")
	tlsSkip := flag.Bool("tls-skip-verify", false, "Skip TLS certificate verification (dev only)")
	flag.Parse()

	if *bindDN == "" || *baseDN == "" {
		fmt.Fprintln(os.Stderr, "lldap-export: --bind-dn and --base-dn are required")
		flag.Usage()
		os.Exit(1)
	}

	log := zerolog.New(os.Stderr).With().Timestamp().Logger()
	emitter := telemetry.NewLogEmitter(log)

	cfg := lldap.Config{
		URL:           *url,
		BindDN:        *bindDN,
		BindPW:        *bindPW,
		BaseDN:        *baseDN,
		TLSSkipVerify: *tlsSkip,
	}

	repo := lldap.New(cfg)
	exp := lldapexport.New(repo, validator.ModeProvisioning, emitter)

	result, err := exp.Export(context.Background(), *output)
	if err != nil {
		fmt.Fprintf(os.Stderr, "lldap-export: export failed: %v\n", err)
		os.Exit(1)
	}

	fmt.Fprintf(os.Stdout, "Exported %d users, %d groups to %s (group enumeration: %s)\n",
		len(result.Users), len(result.Groups), *output, result.GroupEnumeration)

	if result.GroupEnumeration != lldapexport.EnumerationDirectory {
		fmt.Fprintln(os.Stderr,
			"lldap-export: groups were derived from user memberships; groups with no members are absent")
	}

	if len(result.IncompatibilityReport) > 0 {
		fmt.Fprintln(os.Stderr, "Incompatibility report:")
		for _, item := range result.IncompatibilityReport {
			fmt.Fprintln(os.Stderr, "  -", item)
		}
		os.Exit(2) // partial success: exported with warnings
	}
}