package main

import (
	"bytes"
	"database/sql"
	"encoding/json"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"
	"text/tabwriter"
	"time"

	"fn-registry/functions/infra"
	"fn-registry/registry"
)

func cmdVault(args []string) {
	if len(args) < 1 {
		vaultUsage()
		os.Exit(1)
	}

	switch args[0] {
	case "list":
		vaultList()
	case "search":
		vaultSearch(args[1:])
	case "index":
		vaultIndex(args[1:])
	case "info":
		vaultInfo(args[1:])
	case "layout-ensure":
		vaultLayoutEnsure(args[1:])
	case "profile":
		vaultProfile(args[1:])
	case "dedupe":
		vaultDedupe(args[1:])
	case "aggregate":
		vaultAggregate()
	case "doctor":
		vaultDoctorCmd()
	case "audit":
		vaultAudit(args[1:])
	case "help", "-h", "--help":
		vaultUsage()
	default:
		fmt.Fprintf(os.Stderr, "unknown vault subcommand: %s\n", args[0])
		vaultUsage()
		os.Exit(1)
	}
}

func vaultUsage() {
	fmt.Println(`fn vault — manage data vaults

Usage:
  fn vault list                           List declared vaults
  fn vault search <query> [--limit N] [--vault <name>] [--json]
                                          Search files in vault(s)
  fn vault index <name>                   Index a vault (scan + write)
  fn vault index --all                    Index all declared vaults
  fn vault info <name>                    Show vault summary and stats
  fn vault layout-ensure <name> [--dry-run]
                                          Ensure canonical data/knowledge layout
  fn vault profile <name>                 Profile CSV/PDF/MD files in a vault
  fn vault dedupe <name>                  Report duplicate files in a vault
  fn vault aggregate                      Aggregate all vault indexes into registry.db
  fn vault doctor                         Audit vault health (alias for fn doctor vaults)
  fn vault audit <name>                   Run full audit pipeline on a vault
  fn vault audit --all                    Run audit on all declared vaults`)
}

// --- list ---

func vaultList() {
	db := openDB()
	defer db.Close()

	vaults, err := db.AllVaults()
	if err != nil {
		fmt.Fprintf(os.Stderr, "error: %v\n", err)
		os.Exit(1)
	}

	if len(vaults) == 0 {
		fmt.Println("No vaults registered. Declare vaults in projects/*/vaults/vault.yaml and run 'fn index'.")
		return
	}

	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
	fmt.Fprintln(w, "NAME\tPROJECT\tPATH\tTAGS")
	for _, v := range vaults {
		tags := strings.Join(v.Tags, ",")
		path := v.Path
		if path == "" {
			path = "-"
		}
		proj := v.ProjectID
		if proj == "" {
			proj = "-"
		}
		fmt.Fprintf(w, "%s\t%s\t%s\t%s\n", v.Name, proj, path, tags)
	}
	w.Flush()
}

// --- search ---

func vaultSearch(args []string) {
	var query string
	var vaultName string
	var limitN int
	var jsonOut bool

	i := 0
	for i < len(args) {
		switch args[i] {
		case "--limit":
			i++
			if i >= len(args) {
				fmt.Fprintln(os.Stderr, "--limit requires a value")
				os.Exit(1)
			}
			n, err := strconv.Atoi(args[i])
			if err != nil {
				fmt.Fprintf(os.Stderr, "--limit: invalid number %q\n", args[i])
				os.Exit(1)
			}
			limitN = n
		case "--vault":
			i++
			if i >= len(args) {
				fmt.Fprintln(os.Stderr, "--vault requires a value")
				os.Exit(1)
			}
			vaultName = args[i]
		case "--json":
			jsonOut = true
		default:
			if query == "" && !strings.HasPrefix(args[i], "--") {
				query = args[i]
			}
		}
		i++
	}

	if query == "" {
		fmt.Fprintln(os.Stderr, "usage: fn vault search <query> [--limit N] [--vault <name>] [--json]")
		os.Exit(1)
	}
	if limitN <= 0 {
		limitN = 50
	}

	db := openDB()
	defer db.Close()

	// Determine which vaults to search.
	vaults, err := resolveSearchVaults(db, vaultName)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error: %v\n", err)
		os.Exit(1)
	}
	if len(vaults) == 0 {
		fmt.Fprintln(os.Stderr, "no vaults found")
		os.Exit(1)
	}

	var allHits []infra.VaultSearchHit
	for _, v := range vaults {
		if v.Path == "" {
			continue
		}
		hits, err := infra.VaultSearch(v.Path, query, limitN)
		if err != nil {
			fmt.Fprintf(os.Stderr, "warn: vault %s: %v\n", v.Name, err)
			continue
		}
		allHits = append(allHits, hits...)
	}

	if jsonOut {
		if allHits == nil {
			allHits = []infra.VaultSearchHit{}
		}
		b, err := json.MarshalIndent(allHits, "", "  ")
		if err != nil {
			fmt.Fprintf(os.Stderr, "json error: %v\n", err)
			os.Exit(1)
		}
		fmt.Println(string(b))
		return
	}

	if len(allHits) == 0 {
		fmt.Println("No results.")
		return
	}

	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
	for _, h := range allHits {
		mtime := time.Unix(h.Mtime, 0).UTC().Format("2006-01-02")
		sizeStr := formatBytes(h.Size)
		snip := truncate(h.Snippet, 50)
		fmt.Fprintf(w, "[%s]\t%s\t%s\t%s\t%s\t%s\n",
			h.VaultName, h.RelPath, sizeStr, mtime, h.Mime, snip)
	}
	w.Flush()
}

// --- index ---

func vaultIndex(args []string) {
	indexAll := false
	var name string

	for _, a := range args {
		if a == "--all" {
			indexAll = true
		} else if !strings.HasPrefix(a, "--") && name == "" {
			name = a
		}
	}

	if !indexAll && name == "" {
		fmt.Fprintln(os.Stderr, "usage: fn vault index <name> | --all")
		os.Exit(1)
	}

	db := openDB()
	defer db.Close()

	var vaults []registry.Vault
	if indexAll {
		all, err := db.AllVaults()
		if err != nil {
			fmt.Fprintf(os.Stderr, "error: %v\n", err)
			os.Exit(1)
		}
		vaults = all
	} else {
		v, err := resolveVaultByName(db, name)
		if err != nil {
			fmt.Fprintf(os.Stderr, "error: %v\n", err)
			os.Exit(1)
		}
		vaults = []registry.Vault{*v}
	}

	for _, v := range vaults {
		if v.Path == "" {
			fmt.Printf("vault %s: path not set, skipping\n", v.Name)
			continue
		}
		if err := runVaultIndex(v); err != nil {
			fmt.Fprintf(os.Stderr, "vault %s: %v\n", v.Name, err)
		}
	}
}

// runVaultIndex runs the full inventory scan + write cycle for a single vault.
func runVaultIndex(v registry.Vault) error {
	fmt.Printf("indexing %s (%s)...\n", v.Name, v.Path)

	files, err := infra.VaultInventoryScan(v.Path, v.ID, v.Name)
	if err != nil {
		return fmt.Errorf("scan: %w", err)
	}

	vaultDB, err := infra.VaultIndexOpen(v.Path)
	if err != nil {
		return fmt.Errorf("open index: %w", err)
	}
	defer vaultDB.Close()

	report, err := infra.VaultIndexWrite(vaultDB, files, true)
	if err != nil {
		return fmt.Errorf("write: %w", err)
	}

	fmt.Printf("  indexed %d files, %d inserted, %d updated, %d pruned\n",
		len(files), report.Inserted, report.Updated, report.Pruned)
	return nil
}

// --- info ---

func vaultInfo(args []string) {
	if len(args) < 1 {
		fmt.Fprintln(os.Stderr, "usage: fn vault info <name>")
		os.Exit(1)
	}
	name := args[0]

	db := openDB()
	defer db.Close()

	v, err := resolveVaultByName(db, name)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error: %v\n", err)
		os.Exit(1)
	}
	if v.Path == "" {
		fmt.Fprintf(os.Stderr, "vault %s has no path set\n", name)
		os.Exit(1)
	}

	vaultDB, err := infra.VaultIndexOpen(v.Path)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error opening vault index: %v\n", err)
		os.Exit(1)
	}
	defer vaultDB.Close()

	// Summary stats.
	var totalFiles int
	var totalSize int64
	vaultDB.QueryRow(`SELECT count(*), coalesce(sum(size),0) FROM files`).Scan(&totalFiles, &totalSize)

	var lastIndexedAt int64
	vaultDB.QueryRow(`SELECT coalesce(max(indexed_at), 0) FROM files`).Scan(&lastIndexedAt)

	lastIndexed := "-"
	if lastIndexedAt > 0 {
		lastIndexed = time.Unix(lastIndexedAt, 0).UTC().Format("2006-01-02 15:04:05")
	}

	fmt.Printf("Vault: %s (%s)\n", v.Name, v.Path)
	fmt.Printf("Files: %d  Total: %s  Last indexed: %s\n\n",
		totalFiles, formatBytes(totalSize), lastIndexed)

	// By bucket.
	bucketRows, err := vaultDB.Query(`
		SELECT bucket, sub_bucket, count(*), coalesce(sum(size),0)
		FROM files
		GROUP BY bucket, sub_bucket
		ORDER BY bucket, sub_bucket`)
	if err == nil {
		defer bucketRows.Close()
		fmt.Println("By bucket:")
		w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
		for bucketRows.Next() {
			var bucket, sub string
			var cnt int
			var sz int64
			bucketRows.Scan(&bucket, &sub, &cnt, &sz)
			key := bucket
			if sub != "" {
				key = bucket + "/" + sub
			}
			fmt.Fprintf(w, "  %s\t%d files\t%s\n", key, cnt, formatBytes(sz))
		}
		w.Flush()
		fmt.Println()
	}

	// By mime.
	mimeRows, err := vaultDB.Query(`
		SELECT mime, count(*), coalesce(sum(size),0)
		FROM files
		GROUP BY mime
		ORDER BY sum(size) DESC`)
	if err == nil {
		defer mimeRows.Close()
		fmt.Println("By mime:")
		w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
		for mimeRows.Next() {
			var mime string
			var cnt int
			var sz int64
			mimeRows.Scan(&mime, &cnt, &sz)
			if mime == "" {
				mime = "unknown"
			}
			fmt.Fprintf(w, "  %s\t%d files\t%s\n", mime, cnt, formatBytes(sz))
		}
		w.Flush()
	}
}

// --- layout-ensure ---

func vaultLayoutEnsure(args []string) {
	dryRun := false
	var name string

	for _, a := range args {
		switch a {
		case "--dry-run":
			dryRun = true
		default:
			if !strings.HasPrefix(a, "--") && name == "" {
				name = a
			}
		}
	}

	if name == "" {
		fmt.Fprintln(os.Stderr, "usage: fn vault layout-ensure <name> [--dry-run]")
		os.Exit(1)
	}

	db := openDB()
	defer db.Close()

	v, err := resolveVaultByName(db, name)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error: %v\n", err)
		os.Exit(1)
	}
	if v.Path == "" {
		fmt.Fprintf(os.Stderr, "vault %s has no path set\n", name)
		os.Exit(1)
	}

	report, err := infra.VaultLayoutEnsure(v.Path, dryRun)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error: %v\n", err)
		os.Exit(1)
	}

	prefix := ""
	if report.DryRun {
		prefix = "[dry-run] "
	}
	fmt.Printf("%sVault: %s (%s)\n", prefix, name, report.VaultPath)
	if len(report.Created) > 0 {
		fmt.Printf("%s  created:    %s\n", prefix, strings.Join(report.Created, ", "))
	}
	if len(report.Migrated) > 0 {
		fmt.Printf("%s  migrated:   %s\n", prefix, strings.Join(report.Migrated, "; "))
	}
	if len(report.AlreadyOK) > 0 {
		fmt.Printf("%s  already ok: %s\n", prefix, strings.Join(report.AlreadyOK, ", "))
	}
	if len(report.Skipped) > 0 {
		fmt.Printf("%s  skipped (unrecognized): %s\n", prefix, strings.Join(report.Skipped, ", "))
	}
	if len(report.Created) == 0 && len(report.Migrated) == 0 {
		fmt.Printf("%s  layout already canonical\n", prefix)
	}
}

// --- profile ---

// profileKind returns "csv", "pdf", "md", or "" for a file based on extension/mime.
func profileKind(ext, mime string) string {
	ext = strings.ToLower(strings.TrimPrefix(ext, "."))
	switch ext {
	case "csv":
		return "csv"
	case "pdf":
		return "pdf"
	case "md", "markdown":
		return "md"
	}
	// Fall back to mime
	if strings.Contains(mime, "csv") || strings.Contains(mime, "text/csv") {
		return "csv"
	}
	if strings.Contains(mime, "pdf") {
		return "pdf"
	}
	if strings.Contains(mime, "markdown") {
		return "md"
	}
	return ""
}

func vaultProfile(args []string) {
	if len(args) < 1 || strings.HasPrefix(args[0], "--") {
		fmt.Fprintln(os.Stderr, "usage: fn vault profile <name>")
		os.Exit(1)
	}
	name := args[0]

	db := openDB()
	defer db.Close()

	v, err := resolveVaultByName(db, name)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error: %v\n", err)
		os.Exit(1)
	}
	if v.Path == "" {
		fmt.Fprintf(os.Stderr, "vault %s has no path set\n", name)
		os.Exit(1)
	}

	vaultDB, err := infra.VaultIndexOpen(v.Path)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error opening vault index: %v\n", err)
		os.Exit(1)
	}
	defer vaultDB.Close()

	// List files with their ext and mime from vault_index.db
	type fileRow struct {
		RelPath string
		Ext     string
		Mime    string
	}
	rows, err := vaultDB.Query(`SELECT rel_path, ext, mime FROM files ORDER BY rel_path`)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error querying vault index: %v\n", err)
		os.Exit(1)
	}
	var files []fileRow
	for rows.Next() {
		var f fileRow
		if scanErr := rows.Scan(&f.RelPath, &f.Ext, &f.Mime); scanErr == nil {
			files = append(files, f)
		}
	}
	rows.Close()

	if len(files) == 0 {
		fmt.Printf("vault %s: no files in index (run 'fn vault index %s' first)\n", name, name)
		return
	}

	// Locate the Python dispatcher
	registryRoot := root()
	dispatchScript := filepath.Join(registryRoot, "python", "functions", "infra", "vault_profile_dispatch.py")
	if _, err := os.Stat(dispatchScript); os.IsNotExist(err) {
		fmt.Fprintf(os.Stderr, "error: dispatch script not found: %s\n", dispatchScript)
		os.Exit(1)
	}

	pythonBin := filepath.Join(registryRoot, "python", ".venv", "bin", "python3")
	if _, err := os.Stat(pythonBin); os.IsNotExist(err) {
		pythonBin = "python3"
	}

	pythonPath := filepath.Join(registryRoot, "python", "functions")

	var nCSV, nPDF, nMD, nSkip, nErr int
	fmt.Printf("profiling vault: %s (%s)\n", name, v.Path)

	for _, f := range files {
		kind := profileKind(f.Ext, f.Mime)
		if kind == "" {
			nSkip++
			continue
		}

		cmd := exec.Command(pythonBin, dispatchScript,
			"--vault", v.Path,
			"--rel-path", f.RelPath,
			"--kind", kind,
		)
		cmd.Env = append(os.Environ(),
			"PYTHONPATH="+pythonPath,
			"FN_REGISTRY_ROOT="+registryRoot,
		)

		var stderr bytes.Buffer
		cmd.Stderr = &stderr
		if runErr := cmd.Run(); runErr != nil {
			fmt.Fprintf(os.Stderr, "  warn: %s (%s): %v\n", f.RelPath, kind, strings.TrimSpace(stderr.String()))
			nErr++
			continue
		}

		switch kind {
		case "csv":
			nCSV++
		case "pdf":
			nPDF++
		case "md":
			nMD++
		}
	}

	fmt.Printf("  csv: %d  pdf: %d  md: %d  skipped: %d  errors: %d\n",
		nCSV, nPDF, nMD, nSkip, nErr)
}

// --- dedupe ---

func vaultDedupe(args []string) {
	if len(args) < 1 || strings.HasPrefix(args[0], "--") {
		fmt.Fprintln(os.Stderr, "usage: fn vault dedupe <name>")
		os.Exit(1)
	}
	name := args[0]

	db := openDB()
	defer db.Close()

	v, err := resolveVaultByName(db, name)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error: %v\n", err)
		os.Exit(1)
	}
	if v.Path == "" {
		fmt.Fprintf(os.Stderr, "vault %s has no path set\n", name)
		os.Exit(1)
	}

	vaultDB, err := infra.VaultIndexOpen(v.Path)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error opening vault index: %v\n", err)
		os.Exit(1)
	}
	defer vaultDB.Close()

	// Find duplicates: groups with the same sha256 hash and size > 0
	rows, err := vaultDB.Query(`
		SELECT sha256, count(*) as cnt, sum(size) as total_size, min(size) as file_size,
		       group_concat(rel_path, '|') as paths
		FROM files
		WHERE sha256 != '' AND size > 0
		GROUP BY sha256
		HAVING count(*) > 1
		ORDER BY sum(size) DESC
		LIMIT 50`)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error querying duplicates: %v\n", err)
		os.Exit(1)
	}
	defer rows.Close()

	type dupeGroup struct {
		Sha256    string
		Count     int
		TotalSize int64
		FileSize  int64
		Paths     []string
	}
	var groups []dupeGroup
	var totalWasted int64
	for rows.Next() {
		var g dupeGroup
		var pathsConcat string
		if scanErr := rows.Scan(&g.Sha256, &g.Count, &g.TotalSize, &g.FileSize, &pathsConcat); scanErr == nil {
			g.Paths = strings.Split(pathsConcat, "|")
			wasted := g.FileSize * int64(g.Count-1)
			totalWasted += wasted
			groups = append(groups, g)
		}
	}
	rows.Close()

	fmt.Printf("Vault: %s — duplicate report\n\n", name)
	if len(groups) == 0 {
		fmt.Println("  No duplicates found.")
		return
	}

	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
	fmt.Fprintln(w, "SHA256\tCOUNT\tSIZE\tWASTED\tPATHS")
	for _, g := range groups {
		sha := g.Sha256
		if len(sha) > 12 {
			sha = sha[:12] + "..."
		}
		wasted := g.FileSize * int64(g.Count-1)
		pathsStr := strings.Join(g.Paths, ", ")
		if len(pathsStr) > 60 {
			pathsStr = pathsStr[:57] + "..."
		}
		fmt.Fprintf(w, "%s\t%d\t%s\t%s\t%s\n",
			sha, g.Count, formatBytes(g.FileSize), formatBytes(wasted), pathsStr)
	}
	w.Flush()
	fmt.Printf("\nTotal wasted space: %s  (%d duplicate groups)\n",
		formatBytes(totalWasted), len(groups))
}

// --- aggregate ---

func vaultAggregate() {
	registryRoot := root()
	fmt.Println("aggregating vault indexes into registry.db...")
	report, err := infra.VaultAggregateIndex(registryRoot)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("  vaults processed: %d  skipped: %d  total files: %d\n",
		report.VaultsProcessed, report.VaultsSkipped, report.TotalFiles)
	if len(report.Errors) > 0 {
		for _, e := range report.Errors {
			fmt.Fprintf(os.Stderr, "  warn: %s\n", e)
		}
	}
}

// --- doctor (vault alias) ---

func vaultDoctorCmd() {
	registryRoot := root()
	entries, err := infra.VaultDoctor(registryRoot)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error: %v\n", err)
		os.Exit(1)
	}
	if len(entries) == 0 {
		fmt.Println("No vaults registered.")
		return
	}
	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
	fmt.Fprintln(w, "VAULT\tSTATUS\tDISK\tINDEXED\tISSUES")
	for _, e := range entries {
		issues := "-"
		if len(e.Issues) > 0 {
			issues = strings.Join(e.Issues, ", ")
		}
		fmt.Fprintf(w, "%s\t%s\t%d\t%d\t%s\n",
			e.VaultName, e.Status, e.DiskFiles, e.IndexedFiles, issues)
	}
	w.Flush()
}

// --- audit ---

func vaultAudit(args []string) {
	auditAll := false
	skipProfilers := false
	dryRunLayout := false
	var names []string

	for _, a := range args {
		switch a {
		case "--all":
			auditAll = true
		case "--skip-profilers":
			skipProfilers = true
		case "--dry-run-layout":
			dryRunLayout = true
		default:
			if !strings.HasPrefix(a, "--") {
				names = append(names, a)
			}
		}
	}

	if !auditAll && len(names) == 0 {
		fmt.Fprintln(os.Stderr, "usage: fn vault audit <name> | --all [--skip-profilers] [--dry-run-layout]")
		os.Exit(1)
	}

	db := openDB()
	defer db.Close()

	var vaults []registry.Vault
	if auditAll {
		all, err := db.AllVaults()
		if err != nil {
			fmt.Fprintf(os.Stderr, "error listing vaults: %v\n", err)
			os.Exit(1)
		}
		vaults = all
	} else {
		for _, n := range names {
			v, err := resolveVaultByName(db, n)
			if err != nil {
				fmt.Fprintf(os.Stderr, "error: %v\n", err)
				os.Exit(1)
			}
			vaults = append(vaults, *v)
		}
	}
	db.Close()

	type auditResult struct {
		Name   string
		Status string
		Errors []string
	}
	var results []auditResult

	for _, v := range vaults {
		fmt.Printf("\n=== vault: %s ===\n", v.Name)
		if v.Path == "" {
			fmt.Printf("  SKIP: no path set\n")
			results = append(results, auditResult{Name: v.Name, Status: "skip"})
			continue
		}

		var errs []string

		// Step 1: layout-ensure
		fmt.Printf("  [1/5] layout-ensure")
		if dryRunLayout {
			fmt.Printf(" (dry-run)")
		}
		fmt.Println()
		layoutReport, layoutErr := infra.VaultLayoutEnsure(v.Path, dryRunLayout)
		if layoutErr != nil {
			fmt.Printf("    ERROR: %v\n", layoutErr)
			errs = append(errs, "layout-ensure: "+layoutErr.Error())
		} else {
			if len(layoutReport.Created) > 0 {
				fmt.Printf("    created: %s\n", strings.Join(layoutReport.Created, ", "))
			}
			if len(layoutReport.Migrated) > 0 {
				fmt.Printf("    migrated: %s\n", strings.Join(layoutReport.Migrated, "; "))
			}
			if len(layoutReport.Created) == 0 && len(layoutReport.Migrated) == 0 {
				fmt.Printf("    layout ok\n")
			}
		}

		// Step 2: index
		fmt.Println("  [2/5] index")
		if indexErr := runVaultIndex(v); indexErr != nil {
			fmt.Printf("    ERROR: %v\n", indexErr)
			errs = append(errs, "index: "+indexErr.Error())
		}

		// Step 3: profile (optional)
		if !skipProfilers {
			fmt.Println("  [3/5] profile")
			runVaultProfileSubcmd(v)
		} else {
			fmt.Println("  [3/5] profile (skipped)")
		}

		// Step 4: dedupe (informational, non-fatal)
		fmt.Println("  [4/5] dedupe")
		runVaultDedupeSubcmd(v)

		// Step 5: aggregate is done once after all vaults
		fmt.Println("  [5/5] aggregate (deferred to end)")

		status := "ok"
		if len(errs) > 0 {
			status = "error"
		}
		results = append(results, auditResult{Name: v.Name, Status: status, Errors: errs})
	}

	// Final aggregate
	fmt.Println("\n=== aggregate ===")
	vaultAggregate()

	// Summary table
	fmt.Println("\n=== summary ===")
	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
	fmt.Fprintln(w, "VAULT\tSTATUS\tERRORS")
	for _, r := range results {
		errStr := "-"
		if len(r.Errors) > 0 {
			errStr = strings.Join(r.Errors, "; ")
		}
		fmt.Fprintf(w, "%s\t%s\t%s\n", r.Name, r.Status, errStr)
	}
	w.Flush()
}

// runVaultProfileSubcmd runs the profiling loop for a single vault (used by audit).
func runVaultProfileSubcmd(v registry.Vault) {
	registryRoot := root()

	vaultDB, err := infra.VaultIndexOpen(v.Path)
	if err != nil {
		fmt.Printf("    warn: cannot open vault index: %v\n", err)
		return
	}
	defer vaultDB.Close()

	rows, err := vaultDB.Query(`SELECT rel_path, ext, mime FROM files ORDER BY rel_path`)
	if err != nil {
		fmt.Printf("    warn: query failed: %v\n", err)
		return
	}
	type fileRow struct {
		RelPath string
		Ext     string
		Mime    string
	}
	var files []fileRow
	for rows.Next() {
		var f fileRow
		if scanErr := rows.Scan(&f.RelPath, &f.Ext, &f.Mime); scanErr == nil {
			files = append(files, f)
		}
	}
	rows.Close()

	if len(files) == 0 {
		fmt.Printf("    no files in index\n")
		return
	}

	dispatchScript := filepath.Join(registryRoot, "python", "functions", "infra", "vault_profile_dispatch.py")
	pythonBin := filepath.Join(registryRoot, "python", ".venv", "bin", "python3")
	if _, statErr := os.Stat(pythonBin); os.IsNotExist(statErr) {
		pythonBin = "python3"
	}
	pythonPath := filepath.Join(registryRoot, "python", "functions")

	var nCSV, nPDF, nMD, nSkip, nErr int
	for _, f := range files {
		kind := profileKind(f.Ext, f.Mime)
		if kind == "" {
			nSkip++
			continue
		}
		cmd := exec.Command(pythonBin, dispatchScript,
			"--vault", v.Path,
			"--rel-path", f.RelPath,
			"--kind", kind,
		)
		cmd.Env = append(os.Environ(),
			"PYTHONPATH="+pythonPath,
			"FN_REGISTRY_ROOT="+registryRoot,
		)
		var stderr bytes.Buffer
		cmd.Stderr = &stderr
		if runErr := cmd.Run(); runErr != nil {
			nErr++
		} else {
			switch kind {
			case "csv":
				nCSV++
			case "pdf":
				nPDF++
			case "md":
				nMD++
			}
		}
	}
	fmt.Printf("    csv: %d  pdf: %d  md: %d  skipped: %d  errors: %d\n",
		nCSV, nPDF, nMD, nSkip, nErr)
}

// runVaultDedupeSubcmd prints dedupe summary for a single vault (used by audit).
func runVaultDedupeSubcmd(v registry.Vault) {
	vaultDB, err := infra.VaultIndexOpen(v.Path)
	if err != nil {
		fmt.Printf("    warn: cannot open vault index: %v\n", err)
		return
	}
	defer vaultDB.Close()

	var dupeGroups int
	var totalWasted int64
	rows, err := vaultDB.Query(`
		SELECT count(*) as cnt, min(size) as file_size
		FROM files
		WHERE sha256 != '' AND size > 0
		GROUP BY sha256
		HAVING count(*) > 1`)
	if err != nil {
		fmt.Printf("    warn: query failed: %v\n", err)
		return
	}
	for rows.Next() {
		var cnt int
		var fileSize int64
		if scanErr := rows.Scan(&cnt, &fileSize); scanErr == nil {
			dupeGroups++
			totalWasted += fileSize * int64(cnt-1)
		}
	}
	rows.Close()

	if dupeGroups == 0 {
		fmt.Printf("    no duplicates\n")
	} else {
		fmt.Printf("    %d duplicate groups, %s wasted (run 'fn vault dedupe %s' for details)\n",
			dupeGroups, formatBytes(totalWasted), v.Name)
	}
}

// suppress unused sql import if needed
var _ = sql.ErrNoRows

// --- helpers ---

// resolveVaultByName looks up a vault by name in registry.db.
// Returns an error if not found or if name is ambiguous.
func resolveVaultByName(db *registry.DB, name string) (*registry.Vault, error) {
	// Try direct ID first.
	if v, err := db.GetVault(name); err == nil {
		return v, nil
	}

	// Search by name.
	vaults, err := db.SearchVaults(name, "")
	if err != nil {
		return nil, fmt.Errorf("search vaults: %w", err)
	}

	// Exact name match.
	var exact []registry.Vault
	for _, v := range vaults {
		if v.Name == name {
			exact = append(exact, v)
		}
	}
	if len(exact) == 1 {
		return &exact[0], nil
	}
	if len(exact) > 1 {
		ids := make([]string, len(exact))
		for i, v := range exact {
			ids[i] = v.ID
		}
		return nil, fmt.Errorf("ambiguous vault name %q: %s", name, strings.Join(ids, ", "))
	}

	// Partial match fallback.
	if len(vaults) == 1 {
		return &vaults[0], nil
	}
	if len(vaults) > 1 {
		ids := make([]string, len(vaults))
		for i, v := range vaults {
			ids[i] = v.ID
		}
		return nil, fmt.Errorf("ambiguous vault %q — use full name or ID: %s", name, strings.Join(ids, ", "))
	}

	return nil, fmt.Errorf("vault not found: %q (run 'fn index' to register vaults)", name)
}

// resolveSearchVaults returns the vault(s) to search.
// If name is non-empty, returns only that vault. Otherwise returns all vaults.
func resolveSearchVaults(db *registry.DB, name string) ([]registry.Vault, error) {
	if name != "" {
		v, err := resolveVaultByName(db, name)
		if err != nil {
			return nil, err
		}
		return []registry.Vault{*v}, nil
	}
	return db.AllVaults()
}

// formatBytes formats a byte count as a human-readable string (KB, MB, GB).
func formatBytes(b int64) string {
	switch {
	case b >= 1<<30:
		return fmt.Sprintf("%.1f GB", float64(b)/float64(1<<30))
	case b >= 1<<20:
		return fmt.Sprintf("%.1f MB", float64(b)/float64(1<<20))
	case b >= 1<<10:
		return fmt.Sprintf("%.1f KB", float64(b)/float64(1<<10))
	default:
		return fmt.Sprintf("%d B", b)
	}
}

// resolveVaultPath resolves the actual directory path for a vault,
// following symlinks if needed. Returns the resolved absolute path.
func resolveVaultPath(vaultPath string) string {
	resolved, err := filepath.EvalSymlinks(vaultPath)
	if err != nil {
		return vaultPath
	}
	return resolved
}