package cmd

import (
	"errors"
	"io"
	"os"

	cmtcfg "github.com/cometbft/cometbft/config"
	dbm "github.com/cosmos/cosmos-db"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"

	"cosmossdk.io/client/v2/autocli"
	"cosmossdk.io/depinject"
	"cosmossdk.io/log"
	confixcmd "cosmossdk.io/tools/confix/cmd"

	"github.com/skip-mev/block-sdk/v2/tests/app"

	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/client/config"
	"github.com/cosmos/cosmos-sdk/client/debug"
	"github.com/cosmos/cosmos-sdk/client/flags"
	"github.com/cosmos/cosmos-sdk/client/keys"
	"github.com/cosmos/cosmos-sdk/client/pruning"
	"github.com/cosmos/cosmos-sdk/client/rpc"
	"github.com/cosmos/cosmos-sdk/client/snapshot"
	"github.com/cosmos/cosmos-sdk/codec"
	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
	"github.com/cosmos/cosmos-sdk/server"
	serverconfig "github.com/cosmos/cosmos-sdk/server/config"
	servertypes "github.com/cosmos/cosmos-sdk/server/types"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"
	"github.com/cosmos/cosmos-sdk/types/tx/signing"
	authcmd "github.com/cosmos/cosmos-sdk/x/auth/client/cli"
	"github.com/cosmos/cosmos-sdk/x/auth/tx"
	txmodule "github.com/cosmos/cosmos-sdk/x/auth/tx/config"
	"github.com/cosmos/cosmos-sdk/x/auth/types"
	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
	genutilcli "github.com/cosmos/cosmos-sdk/x/genutil/client/cli"
)

// NewRootCmd creates a new root command for simd. It is called once in the main function.
func NewRootCmd() *cobra.Command {
	var (
		interfaceRegistry  codectypes.InterfaceRegistry
		appCodec           codec.Codec
		txConfig           client.TxConfig
		legacyAmino        *codec.LegacyAmino
		autoCliOpts        autocli.AppOptions
		moduleBasicManager module.BasicManager
	)

	if err := depinject.Inject(depinject.Configs(app.AppConfig, depinject.Supply(log.NewNopLogger())),
		&interfaceRegistry,
		&appCodec,
		&txConfig,
		&legacyAmino,
		&autoCliOpts,
		&moduleBasicManager,
	); err != nil {
		panic(err)
	}

	initClientCtx := client.Context{}.
		WithCodec(appCodec).
		WithInterfaceRegistry(interfaceRegistry).
		WithLegacyAmino(legacyAmino).
		WithInput(os.Stdin).
		WithAccountRetriever(types.AccountRetriever{}).
		WithHomeDir(app.DefaultNodeHome).
		WithViper("") // In simapp, we don't use any prefix for env variables.

	rootCmd := &cobra.Command{
		Use:   "testappd",
		Short: "Block SDK's simulation app",
		PersistentPreRunE: func(cmd *cobra.Command, _ []string) error {
			// set the default command outputs
			cmd.SetOut(cmd.OutOrStdout())
			cmd.SetErr(cmd.ErrOrStderr())

			initClientCtx = initClientCtx.WithCmdContext(cmd.Context())
			initClientCtx, err := client.ReadPersistentCommandFlags(initClientCtx, cmd.Flags())
			if err != nil {
				return err
			}

			initClientCtx, err = config.ReadFromClientConfig(initClientCtx)
			if err != nil {
				return err
			}

			// This needs to go after ReadFromClientConfig, as that function
			// sets the RPC client needed for SIGN_MODE_TEXTUAL.
			enabledSignModes := append([]signing.SignMode{signing.SignMode_SIGN_MODE_DIRECT}, tx.DefaultSignModes...)
			txConfigOpts := tx.ConfigOptions{
				EnabledSignModes:           enabledSignModes,
				TextualCoinMetadataQueryFn: txmodule.NewGRPCCoinMetadataQueryFn(initClientCtx),
			}
			txConfigWithTextual, err := tx.NewTxConfigWithOptions(
				codec.NewProtoCodec(interfaceRegistry),
				txConfigOpts,
			)
			if err != nil {
				return err
			}
			initClientCtx = initClientCtx.WithTxConfig(txConfigWithTextual)
			if err := client.SetCmdClientContextHandler(initClientCtx, cmd); err != nil {
				return err
			}

			customAppTemplate, customAppConfig := initAppConfig()
			customCMTConfig := initCometBFTConfig()

			return server.InterceptConfigsPreRunHandler(cmd, customAppTemplate, customAppConfig, customCMTConfig)
		},
	}

	initRootCmd(rootCmd, txConfig, interfaceRegistry, appCodec, moduleBasicManager)

	if err := autoCliOpts.EnhanceRootCommand(rootCmd); err != nil {
		panic(err)
	}

	return rootCmd
}

// initCometBFTConfig helps to override default CometBFT Config values.
// return cmtcfg.DefaultConfig if no custom configuration is required for the application.
func initCometBFTConfig() *cmtcfg.Config {
	cfg := cmtcfg.DefaultConfig()

	// these values put a higher strain on node memory
	// cfg.P2P.MaxNumInboundPeers = 100
	// cfg.P2P.MaxNumOutboundPeers = 40

	return cfg
}

// initAppConfig helps to override default appConfig template and configs.
// return "", nil if no custom configuration is required for the application.
func initAppConfig() (string, interface{}) {
	// The following code snippet is just for reference.

	// WASMConfig defines configuration for the wasm module.
	type WASMConfig struct {
		// This is the maximum sdk gas (wasm and storage) that we allow for any x/wasm "smart" queries
		QueryGasLimit uint64 `mapstructure:"query_gas_limit"`

		// Address defines the gRPC-web server to listen on
		LruSize uint64 `mapstructure:"lru_size"`
	}

	type CustomAppConfig struct {
		serverconfig.Config

		WASM WASMConfig `mapstructure:"wasm"`
	}

	// Optionally allow the chain developer to overwrite the SDK's default
	// server config.
	srvCfg := serverconfig.DefaultConfig()
	// The SDK's default minimum gas price is set to "" (empty value) inside
	// app.toml. If left empty by validators, the node will halt on startup.
	// However, the chain developer can set a default app.toml value for their
	// validators here.
	//
	// In summary:
	// - if you leave srvCfg.MinGasPrices = "", all validators MUST tweak their
	//   own app.toml config,
	// - if you set srvCfg.MinGasPrices non-empty, validators CAN tweak their
	//   own app.toml to override, or use this default value.
	//
	// In simapp, we set the min gas prices to 0.
	srvCfg.MinGasPrices = "0stake"
	// srvCfg.BaseConfig.IAVLDisableFastNode = true // disable fastnode by default

	customAppConfig := CustomAppConfig{
		Config: *srvCfg,
		WASM: WASMConfig{
			LruSize:       1,
			QueryGasLimit: 300000,
		},
	}

	customAppTemplate := serverconfig.DefaultConfigTemplate + `
[wasm]
# This is the maximum sdk gas (wasm and storage) that we allow for any x/wasm "smart" queries
query_gas_limit = 300000
# This is the number of wasm vm instances we keep cached in memory for speed-up
# Warning: this is currently unstable and may lead to crashes, best to keep for 0 unless testing locally
lru_size = 0`

	return customAppTemplate, customAppConfig
}

func initRootCmd(
	rootCmd *cobra.Command,
	txConfig client.TxConfig,
	_ codectypes.InterfaceRegistry,
	_ codec.Codec,
	basicManager module.BasicManager,
) {
	cfg := sdk.GetConfig()
	cfg.Seal()

	rootCmd.AddCommand(
		genutilcli.InitCmd(basicManager, app.DefaultNodeHome),
		NewTestnetCmd(basicManager, banktypes.GenesisBalancesIterator{}),
		debug.Cmd(),
		confixcmd.ConfigCommand(),
		pruning.Cmd(newApp, app.DefaultNodeHome),
		snapshot.Cmd(newApp),
	)

	server.AddCommands(rootCmd, app.DefaultNodeHome, newApp, appExport, addModuleInitFlags)

	// add keybase, auxiliary RPC, query, genesis, and tx child commands
	rootCmd.AddCommand(
		server.StatusCommand(),
		genesisCommand(txConfig, basicManager),
		queryCommand(),
		txCommand(),
		keys.Commands(),
	)
}

func addModuleInitFlags(cmd *cobra.Command) {
	cmd.Flags().Bool(flagCrisisDummy, true, "dummy flag for crisis module")
}

// genesisCommand builds genesis-related `simd genesis` command. Users may provide application specific commands as a parameter
func genesisCommand(txConfig client.TxConfig, basicManager module.BasicManager, cmds ...*cobra.Command) *cobra.Command {
	cmd := genutilcli.Commands(txConfig, basicManager, app.DefaultNodeHome)

	for _, subCmd := range cmds {
		cmd.AddCommand(subCmd)
	}
	return cmd
}

func queryCommand() *cobra.Command {
	cmd := &cobra.Command{
		Use:                        "query",
		Aliases:                    []string{"q"},
		Short:                      "Querying subcommands",
		DisableFlagParsing:         false,
		SuggestionsMinimumDistance: 2,
		RunE:                       client.ValidateCmd,
	}

	cmd.AddCommand(
		rpc.ValidatorCommand(),
		server.QueryBlockCmd(),
		authcmd.QueryTxsByEventsCmd(),
		server.QueryBlocksCmd(),
		authcmd.QueryTxCmd(),
	)

	return cmd
}

func txCommand() *cobra.Command {
	cmd := &cobra.Command{
		Use:                        "tx",
		Short:                      "Transactions subcommands",
		DisableFlagParsing:         false,
		SuggestionsMinimumDistance: 2,
		RunE:                       client.ValidateCmd,
	}

	cmd.AddCommand(
		authcmd.GetSignCommand(),
		authcmd.GetSignBatchCommand(),
		authcmd.GetMultiSignCommand(),
		authcmd.GetMultiSignBatchCmd(),
		authcmd.GetValidateSignaturesCommand(),
		authcmd.GetBroadcastCommand(),
		authcmd.GetEncodeCommand(),
		authcmd.GetDecodeCommand(),
	)

	return cmd
}

// newApp creates the application
func newApp(
	logger log.Logger,
	db dbm.DB,
	traceStore io.Writer,
	appOpts servertypes.AppOptions,
) servertypes.Application {
	baseappOptions := server.DefaultBaseappOptions(appOpts)

	return app.New(
		logger, db, traceStore, true,
		appOpts,
		baseappOptions...,
	)
}

// appExport creates a new simapp (optionally at a given height) and exports state.
func appExport(
	logger log.Logger,
	db dbm.DB,
	traceStore io.Writer,
	height int64,
	forZeroHeight bool,
	jailAllowedAddrs []string,
	appOpts servertypes.AppOptions,
	modulesToExport []string,
) (servertypes.ExportedApp, error) {
	// this check is necessary as we use the flag in x/upgrade.
	// we can exit more gracefully by checking the flag here.
	homePath, ok := appOpts.Get(flags.FlagHome).(string)
	if !ok || homePath == "" {
		return servertypes.ExportedApp{}, errors.New("application home not set")
	}

	viperAppOpts, ok := appOpts.(*viper.Viper)
	if !ok {
		return servertypes.ExportedApp{}, errors.New("appOpts is not viper.Viper")
	}

	// overwrite the FlagInvCheckPeriod
	viperAppOpts.Set(server.FlagInvCheckPeriod, 1)
	appOpts = viperAppOpts

	var simApp *app.TestApp
	if height != -1 {
		simApp = app.New(logger, db, traceStore, false, appOpts)

		if err := simApp.LoadHeight(height); err != nil {
			return servertypes.ExportedApp{}, err
		}
	} else {
		simApp = app.New(logger, db, traceStore, true, appOpts)
	}

	return simApp.ExportAppStateAndValidators(forZeroHeight, jailAllowedAddrs, modulesToExport)
}