package config

import (
	"encoding/json"
	"os/user"
	"path/filepath"
	"sync"
)

const DefaultConfigTemplate = `
###############################################################################
###                         Planetmint                                      ###
###############################################################################

[planetmint]

asset-registry-endpoint = "{{ .PlmntConfig.AssetRegistryEndpoint }}"
token-denom = "{{ .PlmntConfig.TokenDenom }}"
stake-denom = "{{ .PlmntConfig.StakeDenom }}"
fee-denom = "{{ .PlmntConfig.FeeDenom }}"
config-root-dir = "{{ .PlmntConfig.ConfigRootDir }}"
pop-epochs = {{ .PlmntConfig.PoPEpochs }}
rpc-host = "{{ .PlmntConfig.RPCHost }}"
rpc-port = {{ .PlmntConfig.RPCPort }}
rpc-user = "{{ .PlmntConfig.RPCUser }}"
rpc-password = "{{ .PlmntConfig.RPCPassword }}"
mint-address = "{{ .PlmntConfig.MintAddress }}"
issuance-service-dir = {{ .PlmntConfig.IssuanceServiceDir }}
`

// Config defines Planetmint's top level configuration
type Config struct {
	AssetRegistryEndpoint string `mapstructure:"asset-registry-endpoint " json:"asset-registry-endpoint "`
	TokenDenom            string `mapstructure:"token-denom" json:"token-denom"`
	StakeDenom            string `mapstructure:"stake-denom" json:"stake-denom"`
	FeeDenom              string `mapstructure:"fee-denom" json:"fee-denom"`
	ConfigRootDir         string `mapstructure:"config-root-dir" json:"config-root-dir"`
	PoPEpochs             int    `mapstructure:"pop-epochs" json:"pop-epochs"`
	RPCHost               string `mapstructure:"rpc-host" json:"rpc-host"`
	RPCPort               int    `mapstructure:"rpc-port" json:"rpc-port"`
	RPCUser               string `mapstructure:"rpc-user" json:"rpc-user"`
	RPCPassword           string `mapstructure:"rpc-password" json:"rpc-password"`
	IssuanceServiceDir    string `mapstructure:"issuance-service-dir" json:"issuance-service-dir"`
	MintAddress           string `mapstructure:"mint-address" json:"mint-address"`
}

// cosmos-sdk wide global singleton
var (
	plmntConfig *Config
	initConfig  sync.Once
)

// DefaultConfig returns planetmint's default configuration.
func DefaultConfig() *Config {
	currentUser, err := user.Current()
	if err != nil {
		panic(err)
	}

	return &Config{
		AssetRegistryEndpoint: "https://assets.rddl.io/register_asset",
		TokenDenom:            "plmnt",
		StakeDenom:            "plmntstake",
		FeeDenom:              "plmnt",
		ConfigRootDir:         filepath.Join(currentUser.HomeDir, ".planetmint-go"),
		PoPEpochs:             24, // 24 CometBFT epochs of 5s equate 120s
		RPCHost:               "localhost",
		RPCPort:               18884,
		RPCUser:               "user",
		RPCPassword:           "password",
		IssuanceServiceDir:    "/opt/issuer_service",
		MintAddress:           "default",
	}
}

// GetConfig returns the config instance for the SDK.
func GetConfig() *Config {
	initConfig.Do(func() {
		plmntConfig = DefaultConfig()
	})
	return plmntConfig
}

// SetWatchmenConfig sets Planetmint's configuration
func (config *Config) SetPlanetmintConfig(planetmintconfig interface{}) {
	jsonConfig, err := json.Marshal(planetmintconfig)
	if err != nil {
		panic(err)
	}
	err = json.Unmarshal(jsonConfig, &config)
	if err != nil {
		panic(err)
	}
}