package main

import (
	"context"
	"fmt"
	"log"
	"os"
	"os/signal"
	"strings"
	"syscall"
	"time"

	"github.com/urfave/cli/v2"

	"code.t-juice.club/torjus/labmcp/internal/database"
	"code.t-juice.club/torjus/labmcp/internal/mcp"
	"code.t-juice.club/torjus/labmcp/internal/nixos"
	"code.t-juice.club/torjus/labmcp/internal/packages"
)

const (
	defaultDatabase = "sqlite://nixpkgs-search.db"
	version         = "0.4.0"
)

func main() {
	app := &cli.App{
		Name:    "nixpkgs-search",
		Usage:   "Search nixpkgs options and packages",
		Version: version,
		Flags: []cli.Flag{
			&cli.StringFlag{
				Name:    "database",
				Aliases: []string{"d"},
				Usage:   "Database connection string (postgres://... or sqlite://...)",
				EnvVars: []string{"NIXPKGS_SEARCH_DATABASE"},
				Value:   defaultDatabase,
			},
		},
		Commands: []*cli.Command{
			optionsCommand(),
			packagesCommand(),
			indexCommand(),
			listCommand(),
			deleteCommand(),
		},
	}

	if err := app.Run(os.Args); err != nil {
		log.Fatal(err)
	}
}

// optionsCommand returns the options subcommand.
func optionsCommand() *cli.Command {
	return &cli.Command{
		Name:  "options",
		Usage: "NixOS options commands",
		Subcommands: []*cli.Command{
			{
				Name:  "serve",
				Usage: "Run MCP server for NixOS options",
				Flags: serveFlags(),
				Action: func(c *cli.Context) error {
					return runOptionsServe(c)
				},
			},
			{
				Name:      "search",
				Usage:     "Search for options",
				ArgsUsage: "<query>",
				Flags: []cli.Flag{
					&cli.StringFlag{
						Name:    "revision",
						Aliases: []string{"r"},
						Usage:   "Revision to search (default: most recent)",
					},
					&cli.IntFlag{
						Name:    "limit",
						Aliases: []string{"n"},
						Usage:   "Maximum number of results",
						Value:   20,
					},
				},
				Action: func(c *cli.Context) error {
					if c.NArg() < 1 {
						return fmt.Errorf("query argument required")
					}
					return runOptionsSearch(c, c.Args().First())
				},
			},
			{
				Name:      "get",
				Usage:     "Get details for a specific option",
				ArgsUsage: "<option-name>",
				Flags: []cli.Flag{
					&cli.StringFlag{
						Name:    "revision",
						Aliases: []string{"r"},
						Usage:   "Revision to search (default: most recent)",
					},
				},
				Action: func(c *cli.Context) error {
					if c.NArg() < 1 {
						return fmt.Errorf("option name required")
					}
					return runOptionsGet(c, c.Args().First())
				},
			},
		},
	}
}

// packagesCommand returns the packages subcommand.
func packagesCommand() *cli.Command {
	return &cli.Command{
		Name:  "packages",
		Usage: "Nix packages commands",
		Subcommands: []*cli.Command{
			{
				Name:  "serve",
				Usage: "Run MCP server for Nix packages",
				Flags: serveFlags(),
				Action: func(c *cli.Context) error {
					return runPackagesServe(c)
				},
			},
			{
				Name:      "search",
				Usage:     "Search for packages",
				ArgsUsage: "<query>",
				Flags: []cli.Flag{
					&cli.StringFlag{
						Name:    "revision",
						Aliases: []string{"r"},
						Usage:   "Revision to search (default: most recent)",
					},
					&cli.IntFlag{
						Name:    "limit",
						Aliases: []string{"n"},
						Usage:   "Maximum number of results",
						Value:   20,
					},
					&cli.BoolFlag{
						Name:  "broken",
						Usage: "Include broken packages only",
					},
					&cli.BoolFlag{
						Name:  "unfree",
						Usage: "Include unfree packages only",
					},
				},
				Action: func(c *cli.Context) error {
					if c.NArg() < 1 {
						return fmt.Errorf("query argument required")
					}
					return runPackagesSearch(c, c.Args().First())
				},
			},
			{
				Name:      "get",
				Usage:     "Get details for a specific package",
				ArgsUsage: "<attr-path>",
				Flags: []cli.Flag{
					&cli.StringFlag{
						Name:    "revision",
						Aliases: []string{"r"},
						Usage:   "Revision to search (default: most recent)",
					},
				},
				Action: func(c *cli.Context) error {
					if c.NArg() < 1 {
						return fmt.Errorf("attr path required")
					}
					return runPackagesGet(c, c.Args().First())
				},
			},
		},
	}
}

// indexCommand returns the index command (indexes both options and packages).
func indexCommand() *cli.Command {
	return &cli.Command{
		Name:      "index",
		Usage:     "Index a nixpkgs revision (options and packages)",
		ArgsUsage: "<revision>",
		Flags: []cli.Flag{
			&cli.BoolFlag{
				Name:  "no-files",
				Usage: "Skip indexing file contents",
			},
			&cli.BoolFlag{
				Name:  "no-packages",
				Usage: "Skip indexing packages (options only)",
			},
			&cli.BoolFlag{
				Name:  "no-options",
				Usage: "Skip indexing options (packages only)",
			},
			&cli.BoolFlag{
				Name:    "force",
				Aliases: []string{"f"},
				Usage:   "Force re-indexing even if revision already exists",
			},
		},
		Action: func(c *cli.Context) error {
			if c.NArg() < 1 {
				return fmt.Errorf("revision argument required")
			}
			return runIndex(c, c.Args().First())
		},
	}
}

// listCommand returns the list command.
func listCommand() *cli.Command {
	return &cli.Command{
		Name:  "list",
		Usage: "List indexed revisions",
		Action: func(c *cli.Context) error {
			return runList(c)
		},
	}
}

// deleteCommand returns the delete command.
func deleteCommand() *cli.Command {
	return &cli.Command{
		Name:      "delete",
		Usage:     "Delete an indexed revision",
		ArgsUsage: "<revision>",
		Action: func(c *cli.Context) error {
			if c.NArg() < 1 {
				return fmt.Errorf("revision argument required")
			}
			return runDelete(c, c.Args().First())
		},
	}
}

// serveFlags returns common flags for serve commands.
func serveFlags() []cli.Flag {
	return []cli.Flag{
		&cli.StringFlag{
			Name:    "transport",
			Aliases: []string{"t"},
			Usage:   "Transport type: 'stdio' or 'http'",
			Value:   "stdio",
		},
		&cli.StringFlag{
			Name:  "http-address",
			Usage: "HTTP listen address",
			Value: "127.0.0.1:8080",
		},
		&cli.StringFlag{
			Name:  "http-endpoint",
			Usage: "HTTP endpoint path",
			Value: "/mcp",
		},
		&cli.StringSliceFlag{
			Name:  "allowed-origins",
			Usage: "Allowed Origin headers for CORS (can be specified multiple times)",
		},
		&cli.StringFlag{
			Name:  "tls-cert",
			Usage: "TLS certificate file",
		},
		&cli.StringFlag{
			Name:  "tls-key",
			Usage: "TLS key file",
		},
		&cli.DurationFlag{
			Name:  "session-ttl",
			Usage: "Session TTL for HTTP transport",
			Value: 30 * time.Minute,
		},
	}
}

// openStore opens a database store based on the connection string.
func openStore(connStr string) (database.Store, error) {
	if strings.HasPrefix(connStr, "sqlite://") {
		path := strings.TrimPrefix(connStr, "sqlite://")
		return database.NewSQLiteStore(path)
	}
	if strings.HasPrefix(connStr, "postgres://") || strings.HasPrefix(connStr, "postgresql://") {
		return database.NewPostgresStore(connStr)
	}
	// Default to SQLite with the connection string as path
	return database.NewSQLiteStore(connStr)
}

func runOptionsServe(c *cli.Context) error {
	ctx, cancel := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer cancel()

	store, err := openStore(c.String("database"))
	if err != nil {
		return fmt.Errorf("failed to open database: %w", err)
	}
	defer store.Close() //nolint:errcheck // cleanup on exit

	if err := store.Initialize(ctx); err != nil {
		return fmt.Errorf("failed to initialize database: %w", err)
	}

	logger := log.New(os.Stderr, "[mcp] ", log.LstdFlags)
	config := mcp.DefaultNixOSConfig()
	server := mcp.NewServer(store, logger, config)

	indexer := nixos.NewIndexer(store)
	pkgIndexer := packages.NewIndexer(store)
	server.RegisterHandlersWithPackages(indexer, pkgIndexer)

	transport := c.String("transport")
	switch transport {
	case "stdio":
		logger.Println("Starting NixOS options MCP server on stdio...")
		return server.Run(ctx, os.Stdin, os.Stdout)

	case "http":
		httpConfig := mcp.HTTPConfig{
			Address:        c.String("http-address"),
			Endpoint:       c.String("http-endpoint"),
			AllowedOrigins: c.StringSlice("allowed-origins"),
			SessionTTL:     c.Duration("session-ttl"),
			TLSCertFile:    c.String("tls-cert"),
			TLSKeyFile:     c.String("tls-key"),
		}
		httpTransport := mcp.NewHTTPTransport(server, httpConfig)
		return httpTransport.Run(ctx)

	default:
		return fmt.Errorf("unknown transport: %s (use 'stdio' or 'http')", transport)
	}
}

func runPackagesServe(c *cli.Context) error {
	ctx, cancel := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer cancel()

	store, err := openStore(c.String("database"))
	if err != nil {
		return fmt.Errorf("failed to open database: %w", err)
	}
	defer store.Close() //nolint:errcheck // cleanup on exit

	if err := store.Initialize(ctx); err != nil {
		return fmt.Errorf("failed to initialize database: %w", err)
	}

	logger := log.New(os.Stderr, "[mcp] ", log.LstdFlags)
	config := mcp.DefaultNixpkgsPackagesConfig()
	server := mcp.NewServer(store, logger, config)

	pkgIndexer := packages.NewIndexer(store)
	server.RegisterPackageHandlers(pkgIndexer)

	transport := c.String("transport")
	switch transport {
	case "stdio":
		logger.Println("Starting nixpkgs packages MCP server on stdio...")
		return server.Run(ctx, os.Stdin, os.Stdout)

	case "http":
		httpConfig := mcp.HTTPConfig{
			Address:        c.String("http-address"),
			Endpoint:       c.String("http-endpoint"),
			AllowedOrigins: c.StringSlice("allowed-origins"),
			SessionTTL:     c.Duration("session-ttl"),
			TLSCertFile:    c.String("tls-cert"),
			TLSKeyFile:     c.String("tls-key"),
		}
		httpTransport := mcp.NewHTTPTransport(server, httpConfig)
		return httpTransport.Run(ctx)

	default:
		return fmt.Errorf("unknown transport: %s (use 'stdio' or 'http')", transport)
	}
}

func runIndex(c *cli.Context, revision string) error {
	ctx := context.Background()

	store, err := openStore(c.String("database"))
	if err != nil {
		return fmt.Errorf("failed to open database: %w", err)
	}
	defer store.Close() //nolint:errcheck // cleanup on exit

	if err := store.Initialize(ctx); err != nil {
		return fmt.Errorf("failed to initialize database: %w", err)
	}

	indexFiles := !c.Bool("no-files")
	indexOptions := !c.Bool("no-options")
	indexPackages := !c.Bool("no-packages")
	force := c.Bool("force")

	optionsIndexer := nixos.NewIndexer(store)
	pkgIndexer := packages.NewIndexer(store)

	// Resolve revision
	ref := optionsIndexer.ResolveRevision(revision)

	fmt.Printf("Indexing revision: %s\n", revision)

	var optionCount, packageCount, fileCount int
	var rev *database.Revision

	// Index options first (creates the revision record)
	if indexOptions {
		var result *nixos.IndexResult
		if force {
			result, err = optionsIndexer.ReindexRevision(ctx, revision)
		} else {
			result, err = optionsIndexer.IndexRevision(ctx, revision)
		}
		if err != nil {
			return fmt.Errorf("options indexing failed: %w", err)
		}

		if result.AlreadyIndexed && !force {
			fmt.Printf("Revision already indexed (%d options). Use --force to re-index.\n", result.OptionCount)
			rev = result.Revision
		} else {
			optionCount = result.OptionCount
			rev = result.Revision
			fmt.Printf("Indexed %d options\n", optionCount)
		}
	} else {
		// If not indexing options, check if revision exists
		rev, err = store.GetRevision(ctx, ref)
		if err != nil {
			return fmt.Errorf("failed to get revision: %w", err)
		}
		if rev == nil {
			// Create revision record without options
			commitDate, _ := pkgIndexer.GetCommitDate(ctx, ref)
			rev = &database.Revision{
				GitHash:     ref,
				ChannelName: pkgIndexer.GetChannelName(revision),
				CommitDate:  commitDate,
			}
			if err := store.CreateRevision(ctx, rev); err != nil {
				return fmt.Errorf("failed to create revision: %w", err)
			}
		}
	}

	// Index files
	if indexFiles && rev != nil {
		fmt.Println("Indexing files...")
		fileCount, err = optionsIndexer.IndexFiles(ctx, rev.ID, rev.GitHash)
		if err != nil {
			fmt.Printf("Warning: file indexing failed: %v\n", err)
		} else {
			fmt.Printf("Indexed %d files\n", fileCount)
		}
	}

	// Index packages
	if indexPackages && rev != nil {
		fmt.Println("Indexing packages...")
		pkgResult, err := pkgIndexer.IndexPackages(ctx, rev.ID, rev.GitHash)
		if err != nil {
			fmt.Printf("Warning: package indexing failed: %v\n", err)
		} else {
			packageCount = pkgResult.PackageCount
			fmt.Printf("Indexed %d packages\n", packageCount)
		}
	}

	// Summary
	fmt.Println()
	fmt.Printf("Git hash: %s\n", rev.GitHash)
	if rev.ChannelName != "" {
		fmt.Printf("Channel: %s\n", rev.ChannelName)
	}
	if optionCount > 0 {
		fmt.Printf("Options: %d\n", optionCount)
	}
	if packageCount > 0 {
		fmt.Printf("Packages: %d\n", packageCount)
	}
	if fileCount > 0 {
		fmt.Printf("Files: %d\n", fileCount)
	}

	return nil
}

func runList(c *cli.Context) error {
	ctx := context.Background()

	store, err := openStore(c.String("database"))
	if err != nil {
		return fmt.Errorf("failed to open database: %w", err)
	}
	defer store.Close() //nolint:errcheck // cleanup on exit

	if err := store.Initialize(ctx); err != nil {
		return fmt.Errorf("failed to initialize database: %w", err)
	}

	revisions, err := store.ListRevisions(ctx)
	if err != nil {
		return fmt.Errorf("failed to list revisions: %w", err)
	}

	if len(revisions) == 0 {
		fmt.Println("No revisions indexed.")
		fmt.Println("Use 'nixpkgs-search index <revision>' to index a nixpkgs version.")
		return nil
	}

	fmt.Printf("Indexed revisions (%d):\n\n", len(revisions))
	for _, rev := range revisions {
		fmt.Printf("  %s", rev.GitHash[:12])
		if rev.ChannelName != "" {
			fmt.Printf(" (%s)", rev.ChannelName)
		}
		fmt.Printf("\n    Options: %d, Packages: %d, Indexed: %s\n",
			rev.OptionCount, rev.PackageCount, rev.IndexedAt.Format("2006-01-02 15:04"))
	}

	return nil
}

func runDelete(c *cli.Context, revision string) error {
	ctx := context.Background()

	store, err := openStore(c.String("database"))
	if err != nil {
		return fmt.Errorf("failed to open database: %w", err)
	}
	defer store.Close() //nolint:errcheck // cleanup on exit

	if err := store.Initialize(ctx); err != nil {
		return fmt.Errorf("failed to initialize database: %w", err)
	}

	// Find revision
	rev, err := store.GetRevision(ctx, revision)
	if err != nil {
		return fmt.Errorf("failed to get revision: %w", err)
	}
	if rev == nil {
		rev, err = store.GetRevisionByChannel(ctx, revision)
		if err != nil {
			return fmt.Errorf("failed to get revision: %w", err)
		}
	}

	if rev == nil {
		return fmt.Errorf("revision '%s' not found", revision)
	}

	if err := store.DeleteRevision(ctx, rev.ID); err != nil {
		return fmt.Errorf("failed to delete revision: %w", err)
	}

	fmt.Printf("Deleted revision %s\n", rev.GitHash)
	return nil
}

// Options search and get functions
func runOptionsSearch(c *cli.Context, query string) error {
	ctx := context.Background()

	store, err := openStore(c.String("database"))
	if err != nil {
		return fmt.Errorf("failed to open database: %w", err)
	}
	defer store.Close() //nolint:errcheck // cleanup on exit

	if err := store.Initialize(ctx); err != nil {
		return fmt.Errorf("failed to initialize database: %w", err)
	}

	rev, err := resolveRevision(ctx, store, c.String("revision"))
	if err != nil {
		return err
	}
	if rev == nil {
		return fmt.Errorf("no indexed revision found")
	}

	filters := database.SearchFilters{
		Limit: c.Int("limit"),
	}

	options, err := store.SearchOptions(ctx, rev.ID, query, filters)
	if err != nil {
		return fmt.Errorf("search failed: %w", err)
	}

	if len(options) == 0 {
		fmt.Printf("No options found matching '%s'\n", query)
		return nil
	}

	fmt.Printf("Found %d options matching '%s':\n\n", len(options), query)
	for _, opt := range options {
		fmt.Printf("  %s\n", opt.Name)
		fmt.Printf("    Type: %s\n", opt.Type)
		if opt.Description != "" {
			desc := opt.Description
			if len(desc) > 100 {
				desc = desc[:100] + "..."
			}
			fmt.Printf("    %s\n", desc)
		}
		fmt.Println()
	}

	return nil
}

func runOptionsGet(c *cli.Context, name string) error {
	ctx := context.Background()

	store, err := openStore(c.String("database"))
	if err != nil {
		return fmt.Errorf("failed to open database: %w", err)
	}
	defer store.Close() //nolint:errcheck // cleanup on exit

	if err := store.Initialize(ctx); err != nil {
		return fmt.Errorf("failed to initialize database: %w", err)
	}

	rev, err := resolveRevision(ctx, store, c.String("revision"))
	if err != nil {
		return err
	}
	if rev == nil {
		return fmt.Errorf("no indexed revision found")
	}

	opt, err := store.GetOption(ctx, rev.ID, name)
	if err != nil {
		return fmt.Errorf("failed to get option: %w", err)
	}
	if opt == nil {
		return fmt.Errorf("option '%s' not found", name)
	}

	fmt.Printf("%s\n", opt.Name)
	fmt.Printf("  Type: %s\n", opt.Type)
	if opt.Description != "" {
		fmt.Printf("  Description: %s\n", opt.Description)
	}
	if opt.DefaultValue != "" && opt.DefaultValue != "null" {
		fmt.Printf("  Default: %s\n", opt.DefaultValue)
	}
	if opt.Example != "" && opt.Example != "null" {
		fmt.Printf("  Example: %s\n", opt.Example)
	}
	if opt.ReadOnly {
		fmt.Println("  Read-only: yes")
	}

	// Get declarations
	declarations, err := store.GetDeclarations(ctx, opt.ID)
	if err == nil && len(declarations) > 0 {
		fmt.Println("  Declared in:")
		for _, decl := range declarations {
			if decl.Line > 0 {
				fmt.Printf("    - %s:%d\n", decl.FilePath, decl.Line)
			} else {
				fmt.Printf("    - %s\n", decl.FilePath)
			}
		}
	}

	// Get children
	children, err := store.GetChildren(ctx, rev.ID, opt.Name)
	if err == nil && len(children) > 0 {
		fmt.Println("  Sub-options:")
		for _, child := range children {
			shortName := child.Name
			if strings.HasPrefix(child.Name, opt.Name+".") {
				shortName = child.Name[len(opt.Name)+1:]
			}
			fmt.Printf("    - %s (%s)\n", shortName, child.Type)
		}
	}

	return nil
}

// Packages search and get functions
func runPackagesSearch(c *cli.Context, query string) error {
	ctx := context.Background()

	store, err := openStore(c.String("database"))
	if err != nil {
		return fmt.Errorf("failed to open database: %w", err)
	}
	defer store.Close() //nolint:errcheck // cleanup on exit

	if err := store.Initialize(ctx); err != nil {
		return fmt.Errorf("failed to initialize database: %w", err)
	}

	rev, err := resolveRevision(ctx, store, c.String("revision"))
	if err != nil {
		return err
	}
	if rev == nil {
		return fmt.Errorf("no indexed revision found")
	}

	filters := database.PackageSearchFilters{
		Limit: c.Int("limit"),
	}

	if c.IsSet("broken") {
		broken := c.Bool("broken")
		filters.Broken = &broken
	}
	if c.IsSet("unfree") {
		unfree := c.Bool("unfree")
		filters.Unfree = &unfree
	}

	pkgs, err := store.SearchPackages(ctx, rev.ID, query, filters)
	if err != nil {
		return fmt.Errorf("search failed: %w", err)
	}

	if len(pkgs) == 0 {
		fmt.Printf("No packages found matching '%s'\n", query)
		return nil
	}

	fmt.Printf("Found %d packages matching '%s':\n\n", len(pkgs), query)
	for _, pkg := range pkgs {
		fmt.Printf("  %s\n", pkg.AttrPath)
		fmt.Printf("    Name: %s", pkg.Pname)
		if pkg.Version != "" {
			fmt.Printf(" %s", pkg.Version)
		}
		fmt.Println()
		if pkg.Description != "" {
			desc := pkg.Description
			if len(desc) > 100 {
				desc = desc[:100] + "..."
			}
			fmt.Printf("    %s\n", desc)
		}
		if pkg.Broken || pkg.Unfree || pkg.Insecure {
			var flags []string
			if pkg.Broken {
				flags = append(flags, "broken")
			}
			if pkg.Unfree {
				flags = append(flags, "unfree")
			}
			if pkg.Insecure {
				flags = append(flags, "insecure")
			}
			fmt.Printf("    Flags: %s\n", strings.Join(flags, ", "))
		}
		fmt.Println()
	}

	return nil
}

func runPackagesGet(c *cli.Context, attrPath string) error {
	ctx := context.Background()

	store, err := openStore(c.String("database"))
	if err != nil {
		return fmt.Errorf("failed to open database: %w", err)
	}
	defer store.Close() //nolint:errcheck // cleanup on exit

	if err := store.Initialize(ctx); err != nil {
		return fmt.Errorf("failed to initialize database: %w", err)
	}

	rev, err := resolveRevision(ctx, store, c.String("revision"))
	if err != nil {
		return err
	}
	if rev == nil {
		return fmt.Errorf("no indexed revision found")
	}

	pkg, err := store.GetPackage(ctx, rev.ID, attrPath)
	if err != nil {
		return fmt.Errorf("failed to get package: %w", err)
	}
	if pkg == nil {
		return fmt.Errorf("package '%s' not found", attrPath)
	}

	fmt.Printf("%s\n", pkg.AttrPath)
	fmt.Printf("  Name: %s\n", pkg.Pname)
	if pkg.Version != "" {
		fmt.Printf("  Version: %s\n", pkg.Version)
	}
	if pkg.Description != "" {
		fmt.Printf("  Description: %s\n", pkg.Description)
	}
	if pkg.Homepage != "" {
		fmt.Printf("  Homepage: %s\n", pkg.Homepage)
	}
	if pkg.License != "" && pkg.License != "[]" {
		fmt.Printf("  License: %s\n", pkg.License)
	}
	if pkg.Maintainers != "" && pkg.Maintainers != "[]" {
		fmt.Printf("  Maintainers: %s\n", pkg.Maintainers)
	}

	// Status flags
	if pkg.Broken || pkg.Unfree || pkg.Insecure {
		fmt.Println("  Status:")
		if pkg.Broken {
			fmt.Println("    - broken")
		}
		if pkg.Unfree {
			fmt.Println("    - unfree")
		}
		if pkg.Insecure {
			fmt.Println("    - insecure")
		}
	}

	return nil
}

// resolveRevision finds a revision by hash or channel, or returns the most recent.
func resolveRevision(ctx context.Context, store database.Store, revisionArg string) (*database.Revision, error) {
	if revisionArg != "" {
		rev, err := store.GetRevision(ctx, revisionArg)
		if err != nil {
			return nil, fmt.Errorf("failed to get revision: %w", err)
		}
		if rev != nil {
			return rev, nil
		}
		rev, err = store.GetRevisionByChannel(ctx, revisionArg)
		if err != nil {
			return nil, fmt.Errorf("failed to get revision: %w", err)
		}
		return rev, nil
	}

	// Return most recent
	revisions, err := store.ListRevisions(ctx)
	if err != nil {
		return nil, fmt.Errorf("failed to list revisions: %w", err)
	}
	if len(revisions) > 0 {
		return revisions[0], nil
	}
	return nil, nil
}