package cmd

import (
	"errors"
	"io"

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

	"cosmossdk.io/log"
	"cosmossdk.io/simapp"
	confixcmd "cosmossdk.io/tools/confix/cmd"

	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/client/debug"
	"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/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"
	authcmd "github.com/cosmos/cosmos-sdk/x/auth/client/cli"
	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
	genutilcli "github.com/cosmos/cosmos-sdk/x/genutil/client/cli"
)

// 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.

	// CustomConfig defines an arbitrary custom config to extend app.toml.
	// If you don't need it, you can remove it.
	// If you wish to add fields that correspond to flags that aren't in the SDK server config,
	// this custom config can as well help.
	type CustomConfig struct {
		CustomField string `mapstructure:"custom-field"`
	}

	type CustomAppConfig struct {
		serverconfig.Config `mapstructure:",squash"`

		Custom CustomConfig `mapstructure:"custom"`
	}

	// 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

	// Now we set the custom config default values.
	customAppConfig := CustomAppConfig{
		Config: *srvCfg,
		Custom: CustomConfig{
			CustomField: "anything",
		},
	}

	// The default SDK app template is defined in serverconfig.DefaultConfigTemplate.
	// We append the custom config template to the default one.
	// And we set the default config to the custom app template.
	customAppTemplate := serverconfig.DefaultConfigTemplate + `
[custom]
# That field will be parsed by server.InterceptConfigsPreRunHandler and held by viper.
# Do not forget to add quotes around the value if it is a string.
custom-field = "{{ .Custom.CustomField }}"`

	return customAppTemplate, customAppConfig
}

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

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

	server.AddCommandsWithStartCmdOptions(rootCmd, simapp.DefaultNodeHome, newApp, appExport, server.StartCmdOptions{
		AddFlags: func(startCmd *cobra.Command) {
		},
	})

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

// 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, simapp.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.WaitTxCmd(),
		server.QueryBlockCmd(),
		authcmd.QueryTxsByEventsCmd(),
		server.QueryBlocksCmd(),
		authcmd.QueryTxCmd(),
		server.QueryBlockResultsCmd(),
	)

	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(),
		authcmd.GetSimulateCmd(),
	)

	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 simapp.NewSimApp(
		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) {
	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 *simapp.SimApp
	if height != -1 {
		simApp = simapp.NewSimApp(logger, db, traceStore, false, appOpts)

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

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