//go:build !(js && wasm)

// Package acl implements the "orly acl" subcommand for ACL server operations.
package acl

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"time"

	"go-simpler.org/env"
	"lol.mleku.dev"
	"lol.mleku.dev/chk"
	"lol.mleku.dev/log"

	"next.orly.dev/pkg/acl"
	"next.orly.dev/pkg/acl/server"
	"next.orly.dev/pkg/database"
	databasegrpc "next.orly.dev/pkg/database/grpc"
)

// Config holds the ACL server configuration.
type Config struct {
	// Listen is the gRPC server listen address
	Listen string `env:"ORLY_ACL_LISTEN" default:"127.0.0.1:50052" usage:"gRPC server listen address"`

	// LogLevel is the logging level
	LogLevel string `env:"ORLY_ACL_LOG_LEVEL" default:"info" usage:"log level (trace, debug, info, warn, error)"`

	// Database configuration
	DBType       string `env:"ORLY_ACL_DB_TYPE" default:"grpc" usage:"database type: badger or grpc"`
	GRPCDBServer string `env:"ORLY_ACL_GRPC_DB_SERVER" usage:"gRPC database server address (when DB_TYPE=grpc)"`
	DataDir      string `env:"ORLY_DATA_DIR" usage:"database data directory (when DB_TYPE=badger)"`

	// Badger configuration (when DB_TYPE=badger)
	BlockCacheMB        int           `env:"ORLY_DB_BLOCK_CACHE_MB" default:"256" usage:"block cache size in MB"`
	IndexCacheMB        int           `env:"ORLY_DB_INDEX_CACHE_MB" default:"128" usage:"index cache size in MB"`
	ZSTDLevel           int           `env:"ORLY_DB_ZSTD_LEVEL" default:"3" usage:"ZSTD compression level"`
	QueryCacheSizeMB    int           `env:"ORLY_DB_QUERY_CACHE_SIZE_MB" default:"64" usage:"query cache size in MB"`
	QueryCacheMaxAge    time.Duration `env:"ORLY_DB_QUERY_CACHE_MAX_AGE" default:"5m" usage:"query cache max age"`
	QueryCacheDisabled  bool          `env:"ORLY_DB_QUERY_CACHE_DISABLED" default:"false" usage:"disable query cache"`
	SerialCachePubkeys  int           `env:"ORLY_SERIAL_CACHE_PUBKEYS" default:"100000" usage:"serial cache pubkeys capacity"`
	SerialCacheEventIds int           `env:"ORLY_SERIAL_CACHE_EVENT_IDS" default:"500000" usage:"serial cache event IDs capacity"`

	// ACL configuration
	Owners          string `env:"ORLY_OWNERS" usage:"comma-separated list of owner npubs"`
	Admins          string `env:"ORLY_ADMINS" usage:"comma-separated list of admin npubs"`
	BootstrapRelays string `env:"ORLY_BOOTSTRAP_RELAYS" usage:"comma-separated list of bootstrap relays"`
	RelayAddresses  string `env:"ORLY_RELAY_ADDRESSES" usage:"comma-separated list of relay addresses (self)"`

	// Follows ACL configuration
	FollowListFrequency     time.Duration `env:"ORLY_FOLLOW_LIST_FREQUENCY" default:"1h" usage:"follow list sync frequency"`
	FollowsThrottleEnabled  bool          `env:"ORLY_FOLLOWS_THROTTLE_ENABLED" default:"false" usage:"enable progressive throttle for non-followed users"`
	FollowsThrottlePerEvent time.Duration `env:"ORLY_FOLLOWS_THROTTLE_PER_EVENT" default:"25ms" usage:"throttle delay increment per event"`
	FollowsThrottleMaxDelay time.Duration `env:"ORLY_FOLLOWS_THROTTLE_MAX_DELAY" default:"60s" usage:"maximum throttle delay"`
}

// Run executes the acl subcommand.
func Run(args []string) {
	var driver string
	var listDrivers bool
	var showHelp bool

	for i := 0; i < len(args); i++ {
		arg := args[i]

		if strings.HasPrefix(arg, "--driver=") {
			driver = strings.TrimPrefix(arg, "--driver=")
		} else if arg == "--driver" && i+1 < len(args) {
			driver = args[i+1]
			i++
		} else if arg == "--list-drivers" || arg == "-l" {
			listDrivers = true
		} else if arg == "--help" || arg == "-h" {
			showHelp = true
		}
	}

	if showHelp {
		printACLHelp()
		return
	}

	if listDrivers {
		drivers := acl.ListDriversWithInfo()
		if len(drivers) == 0 {
			fmt.Println("No ACL drivers available.")
			fmt.Println("Build with appropriate tags to include drivers.")
			return
		}
		fmt.Println("Available ACL drivers:")
		for _, d := range drivers {
			fmt.Printf("  %-10s - %s\n", d.Name, d.Description)
		}
		return
	}

	if driver == "" {
		// Check if any driver is registered
		drivers := acl.ListDrivers()
		if len(drivers) == 0 {
			fmt.Fprintln(os.Stderr, "error: no ACL drivers available")
			os.Exit(1)
		}
		if len(drivers) == 1 {
			// Use the only available driver
			driver = drivers[0]
			log.I.F("using default ACL driver: %s", driver)
		} else {
			fmt.Fprintln(os.Stderr, "error: --driver required (multiple drivers available)")
			fmt.Fprintf(os.Stderr, "available: %s\n", strings.Join(drivers, ", "))
			os.Exit(1)
		}
	}

	// Check if driver is available
	if !acl.HasDriver(driver) {
		fmt.Fprintf(os.Stderr, "error: ACL driver %q not available\n", driver)
		fmt.Fprintf(os.Stderr, "available: %s\n", strings.Join(acl.ListDrivers(), ", "))
		os.Exit(1)
	}

	runACLServer(driver)
}

func runACLServer(driver string) {
	cfg := loadConfig()

	// Set log level
	lol.SetLogLevel(cfg.LogLevel)
	log.I.F("orly acl --driver=%s starting with log level: %s", driver, cfg.LogLevel)

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	// Initialize database (direct Badger or gRPC client)
	var db database.Database
	var err error
	var ownsDB bool

	if cfg.DBType == "grpc" {
		// Use gRPC database client
		log.I.F("connecting to gRPC database server at %s", cfg.GRPCDBServer)
		db, err = databasegrpc.New(ctx, &databasegrpc.ClientConfig{
			ServerAddress:  cfg.GRPCDBServer,
			ConnectTimeout: 30 * time.Second,
		})
		if chk.E(err) {
			log.E.F("failed to connect to gRPC database: %v", err)
			os.Exit(1)
		}
		ownsDB = false // gRPC client doesn't own the database
	} else {
		// Use direct Badger database
		dbCfg := &database.DatabaseConfig{
			DataDir:             cfg.DataDir,
			LogLevel:            cfg.LogLevel,
			BlockCacheMB:        cfg.BlockCacheMB,
			IndexCacheMB:        cfg.IndexCacheMB,
			QueryCacheSizeMB:    cfg.QueryCacheSizeMB,
			QueryCacheMaxAge:    cfg.QueryCacheMaxAge,
			QueryCacheDisabled:  cfg.QueryCacheDisabled,
			SerialCachePubkeys:  cfg.SerialCachePubkeys,
			SerialCacheEventIds: cfg.SerialCacheEventIds,
			ZSTDLevel:           cfg.ZSTDLevel,
		}

		log.I.F("initializing Badger database at %s", cfg.DataDir)
		db, err = database.NewWithConfig(ctx, cancel, dbCfg)
		if chk.E(err) {
			log.E.F("failed to initialize database: %v", err)
			os.Exit(1)
		}
		ownsDB = true
	}

	// Wait for database to be ready
	log.I.F("waiting for database to be ready...")
	<-db.Ready()
	log.I.F("database ready")

	// Create server config
	serverCfg := &server.Config{
		Listen:                  cfg.Listen,
		ACLMode:                 driver, // Use the driver name as the ACL mode
		LogLevel:                cfg.LogLevel,
		Owners:                  splitList(cfg.Owners),
		Admins:                  splitList(cfg.Admins),
		BootstrapRelays:         splitList(cfg.BootstrapRelays),
		RelayAddresses:          splitList(cfg.RelayAddresses),
		FollowListFrequency:     cfg.FollowListFrequency,
		FollowsThrottleEnabled:  cfg.FollowsThrottleEnabled,
		FollowsThrottlePerEvent: cfg.FollowsThrottlePerEvent,
		FollowsThrottleMaxDelay: cfg.FollowsThrottleMaxDelay,
	}

	// Create and configure server
	srv := server.New(db, serverCfg, ownsDB)
	if err := srv.ConfigureACL(ctx); chk.E(err) {
		log.E.F("failed to configure ACL: %v", err)
		os.Exit(1)
	}

	// Start server
	if err := srv.ListenAndServe(ctx, cancel); err != nil {
		log.E.F("gRPC server error: %v", err)
	}
}

func loadConfig() *Config {
	cfg := &Config{}
	if err := env.Load(cfg, nil); chk.E(err) {
		log.E.F("failed to load config: %v", err)
		os.Exit(1)
	}

	// Set default data directory if not specified
	if cfg.DataDir == "" {
		home, err := os.UserHomeDir()
		if chk.E(err) {
			log.E.F("failed to get home directory: %v", err)
			os.Exit(1)
		}
		cfg.DataDir = filepath.Join(home, ".local", "share", "ORLY")
	}

	// Ensure data directory exists (for badger mode)
	if cfg.DBType == "badger" {
		if err := os.MkdirAll(cfg.DataDir, 0700); chk.E(err) {
			log.E.F("failed to create data directory %s: %v", cfg.DataDir, err)
			os.Exit(1)
		}
	}

	return cfg
}

func splitList(s string) []string {
	if s == "" {
		return nil
	}
	return strings.Split(s, ",")
}

func printACLHelp() {
	fmt.Println(`orly acl - ACL server operations

Usage:
  orly acl --driver=NAME [options]

Options:
  --driver=NAME      Select ACL driver (follows, managed, curating)
  --list-drivers     List available ACL drivers
  --help, -h         Show this help message

Drivers:
  follows    Whitelist based on admin follow lists
  managed    NIP-86 fine-grained access control
  curating   Rate-limited trust tier system

Environment variables:
  ORLY_ACL_LISTEN               gRPC server listen address (default: 127.0.0.1:50052)
  ORLY_ACL_LOG_LEVEL            Logging level
  ORLY_ACL_DB_TYPE              Database type: badger or grpc
  ORLY_ACL_GRPC_DB_SERVER       gRPC database server address (when DB_TYPE=grpc)
  ORLY_DATA_DIR                 Database data directory (when DB_TYPE=badger)
  ORLY_OWNERS                   Comma-separated owner npubs
  ORLY_ADMINS                   Comma-separated admin npubs
  ORLY_BOOTSTRAP_RELAYS         Comma-separated bootstrap relays
  ORLY_FOLLOW_LIST_FREQUENCY    Follow list sync frequency (default: 1h)

Examples:
  orly acl --driver=follows     Run follows ACL server
  orly acl --driver=managed     Run managed ACL server (NIP-86)
  orly acl --list-drivers       List available drivers`)
}