/*
Copyright IBM Corp. All Rights Reserved.

SPDX-License-Identifier: Apache-2.0
*/

package genesisconfig

import (
	"encoding/json"
	"fmt"
	"path/filepath"
	"sync"
	"time"

	"github.com/hyperledger/fabric-protos-go/orderer/etcdraft"
	"github.com/hyperledger/fabric/common/flogging"
	"github.com/hyperledger/fabric/common/viperutil"
	cf "github.com/hyperledger/fabric/core/config"
	"github.com/hyperledger/fabric/msp"
	"github.com/spf13/viper"
)

const (
	// The type key for etcd based RAFT consensus.
	EtcdRaft = "etcdraft"
)

var logger = flogging.MustGetLogger("common.tools.configtxgen.localconfig")

const (
	// SampleInsecureSoloProfile references the sample profile which does not
	// include any MSPs and uses solo for ordering.
	SampleInsecureSoloProfile = "SampleInsecureSolo"
	// SampleDevModeSoloProfile references the sample profile which requires
	// only basic membership for admin privileges and uses solo for ordering.
	SampleDevModeSoloProfile = "SampleDevModeSolo"
	// SampleSingleMSPSoloProfile references the sample profile which includes
	// only the sample MSP and uses solo for ordering.
	SampleSingleMSPSoloProfile = "SampleSingleMSPSolo"

	// SampleInsecureKafkaProfile references the sample profile which does not
	// include any MSPs and uses Kafka for ordering.
	SampleInsecureKafkaProfile = "SampleInsecureKafka"
	// SampleDevModeKafkaProfile references the sample profile which requires only
	// basic membership for admin privileges and uses Kafka for ordering.
	SampleDevModeKafkaProfile = "SampleDevModeKafka"
	// SampleSingleMSPKafkaProfile references the sample profile which includes
	// only the sample MSP and uses Kafka for ordering.
	SampleSingleMSPKafkaProfile = "SampleSingleMSPKafka"

	// SampleDevModeEtcdRaftProfile references the sample profile used for testing
	// the etcd/raft-based ordering service.
	SampleDevModeEtcdRaftProfile = "SampleDevModeEtcdRaft"

	// SampleSingleMSPChannelProfile references the sample profile which
	// includes only the sample MSP and is used to create a channel
	SampleSingleMSPChannelProfile = "SampleSingleMSPChannel"

	// SampleConsortiumName is the sample consortium from the
	// sample configtx.yaml
	SampleConsortiumName = "SampleConsortium"
	// SampleOrgName is the name of the sample org in the sample profiles
	SampleOrgName = "SampleOrg"

	// AdminRoleAdminPrincipal is set as AdminRole to cause the MSP role of
	// type Admin to be used as the admin principal default
	AdminRoleAdminPrincipal = "Role.ADMIN"
)

// TopLevel consists of the structs used by the configtxgen tool.
type TopLevel struct {
	Profiles      map[string]*Profile        `yaml:"Profiles"`
	Organizations []*Organization            `yaml:"Organizations"`
	Channel       *Profile                   `yaml:"Channel"`
	Application   *Application               `yaml:"Application"`
	Orderer       *Orderer                   `yaml:"Orderer"`
	Capabilities  map[string]map[string]bool `yaml:"Capabilities"`
}

// Profile encodes orderer/application configuration combinations for the
// configtxgen tool.
type Profile struct {
	Consortium   string                 `yaml:"Consortium"`
	Application  *Application           `yaml:"Application"`
	Orderer      *Orderer               `yaml:"Orderer"`
	Consortiums  map[string]*Consortium `yaml:"Consortiums"`
	Capabilities map[string]bool        `yaml:"Capabilities"`
	Policies     map[string]*Policy     `yaml:"Policies"`
}

// Policy encodes a channel config policy
type Policy struct {
	Type string `yaml:"Type"`
	Rule string `yaml:"Rule"`
}

// Consortium represents a group of organizations which may create channels
// with each other
type Consortium struct {
	Organizations []*Organization `yaml:"Organizations"`
}

// Application encodes the application-level configuration needed in config
// transactions.
type Application struct {
	Organizations []*Organization    `yaml:"Organizations"`
	Capabilities  map[string]bool    `yaml:"Capabilities"`
	Policies      map[string]*Policy `yaml:"Policies"`
	ACLs          map[string]string  `yaml:"ACLs"`
}

// Organization encodes the organization-level configuration needed in
// config transactions.
type Organization struct {
	Name     string             `yaml:"Name"`
	ID       string             `yaml:"ID"`
	MSPDir   string             `yaml:"MSPDir"`
	MSPType  string             `yaml:"MSPType"`
	Policies map[string]*Policy `yaml:"Policies"`

	// Note: Viper deserialization does not seem to care for
	// embedding of types, so we use one organization struct
	// for both orderers and applications.
	AnchorPeers      []*AnchorPeer `yaml:"AnchorPeers"`
	OrdererEndpoints []string      `yaml:"OrdererEndpoints"`

	// AdminPrincipal is deprecated and may be removed in a future release
	// it was used for modifying the default policy generation, but policies
	// may now be specified explicitly so it is redundant and unnecessary
	AdminPrincipal string `yaml:"AdminPrincipal"`

	// SkipAsForeign indicates that this org definition is actually unknown to this
	// instance of the tool, so, parsing of this org's parameters should be ignored.
	SkipAsForeign bool
}

// AnchorPeer encodes the necessary fields to identify an anchor peer.
type AnchorPeer struct {
	Host string `yaml:"Host"`
	Port int    `yaml:"Port"`
}

// Orderer contains configuration associated to a channel.
type Orderer struct {
	OrdererType   string                   `yaml:"OrdererType"`
	Addresses     []string                 `yaml:"Addresses"`
	BatchTimeout  time.Duration            `yaml:"BatchTimeout"`
	BatchSize     BatchSize                `yaml:"BatchSize"`
	Kafka         Kafka                    `yaml:"Kafka"`
	EtcdRaft      *etcdraft.ConfigMetadata `yaml:"EtcdRaft"`
	Organizations []*Organization          `yaml:"Organizations"`
	MaxChannels   uint64                   `yaml:"MaxChannels"`
	Capabilities  map[string]bool          `yaml:"Capabilities"`
	Policies      map[string]*Policy       `yaml:"Policies"`
}

// BatchSize contains configuration affecting the size of batches.
type BatchSize struct {
	MaxMessageCount   uint32 `yaml:"MaxMessageCount"`
	AbsoluteMaxBytes  uint32 `yaml:"AbsoluteMaxBytes"`
	PreferredMaxBytes uint32 `yaml:"PreferredMaxBytes"`
}

// Kafka contains configuration for the Kafka-based orderer.
type Kafka struct {
	Brokers []string `yaml:"Brokers"`
}

var genesisDefaults = TopLevel{
	Orderer: &Orderer{
		OrdererType:  "solo",
		BatchTimeout: 2 * time.Second,
		BatchSize: BatchSize{
			MaxMessageCount:   500,
			AbsoluteMaxBytes:  10 * 1024 * 1024,
			PreferredMaxBytes: 2 * 1024 * 1024,
		},
		Kafka: Kafka{
			Brokers: []string{"127.0.0.1:9092"},
		},
		EtcdRaft: &etcdraft.ConfigMetadata{
			Options: &etcdraft.Options{
				TickInterval:         "500ms",
				ElectionTick:         10,
				HeartbeatTick:        1,
				MaxInflightBlocks:    5,
				SnapshotIntervalSize: 16 * 1024 * 1024, // 16 MB
			},
		},
	},
}

// LoadTopLevel simply loads the configtx.yaml file into the structs above and
// completes their initialization. Config paths may optionally be provided and
// will be used in place of the FABRIC_CFG_PATH env variable.
//
// Note, for environment overrides to work properly within a profile, Load
// should be used instead.
func LoadTopLevel(configPaths ...string) *TopLevel {
	config := viper.New()
	if len(configPaths) > 0 {
		for _, p := range configPaths {
			config.AddConfigPath(p)
		}
		config.SetConfigName("configtx")
	} else {
		cf.InitViper(config, "configtx")
	}

	err := config.ReadInConfig()
	if err != nil {
		logger.Panicf("Error reading configuration: %s", err)
	}
	logger.Debugf("Using config file: %s", config.ConfigFileUsed())

	uconf, err := cache.load(config, config.ConfigFileUsed())
	if err != nil {
		logger.Panicf("failed to load configCache: %s", err)
	}
	uconf.completeInitialization(filepath.Dir(config.ConfigFileUsed()))
	logger.Infof("Loaded configuration: %s", config.ConfigFileUsed())

	return uconf
}

// Load returns the orderer/application config combination that corresponds to
// a given profile. Config paths may optionally be provided and will be used
// in place of the FABRIC_CFG_PATH env variable.
func Load(profile string, configPaths ...string) *Profile {
	config := viper.New()
	if len(configPaths) > 0 {
		for _, p := range configPaths {
			config.AddConfigPath(p)
		}
		config.SetConfigName("configtx")
	} else {
		cf.InitViper(config, "configtx")
	}

	err := config.ReadInConfig()
	if err != nil {
		logger.Panicf("Error reading configuration: %s", err)
	}
	logger.Debugf("Using config file: %s", config.ConfigFileUsed())

	uconf, err := cache.load(config, config.ConfigFileUsed())
	if err != nil {
		logger.Panicf("Error loading config from config cache: %s", err)
	}

	result, ok := uconf.Profiles[profile]
	if !ok {
		logger.Panicf("Could not find profile: %s", profile)
	}

	result.completeInitialization(filepath.Dir(config.ConfigFileUsed()))

	logger.Infof("Loaded configuration: %s", config.ConfigFileUsed())

	return result
}

func (t *TopLevel) completeInitialization(configDir string) {
	for _, org := range t.Organizations {
		org.completeInitialization(configDir)
	}

	if t.Orderer != nil {
		t.Orderer.completeInitialization(configDir)
	}
}

func (p *Profile) completeInitialization(configDir string) {
	if p.Application != nil {
		for _, org := range p.Application.Organizations {
			org.completeInitialization(configDir)
		}
	}

	if p.Consortiums != nil {
		for _, consortium := range p.Consortiums {
			for _, org := range consortium.Organizations {
				org.completeInitialization(configDir)
			}
		}
	}

	if p.Orderer != nil {
		for _, org := range p.Orderer.Organizations {
			org.completeInitialization(configDir)
		}
		// Some profiles will not define orderer parameters
		p.Orderer.completeInitialization(configDir)
	}
}

func (org *Organization) completeInitialization(configDir string) {
	// set the MSP type; if none is specified we assume BCCSP
	if org.MSPType == "" {
		org.MSPType = msp.ProviderTypeToString(msp.FABRIC)
	}

	if org.AdminPrincipal == "" {
		org.AdminPrincipal = AdminRoleAdminPrincipal
	}
	translatePaths(configDir, org)
}

func (ord *Orderer) completeInitialization(configDir string) {
loop:
	for {
		switch {
		case ord.OrdererType == "":
			logger.Infof("Orderer.OrdererType unset, setting to %v", genesisDefaults.Orderer.OrdererType)
			ord.OrdererType = genesisDefaults.Orderer.OrdererType
		case ord.BatchTimeout == 0:
			logger.Infof("Orderer.BatchTimeout unset, setting to %s", genesisDefaults.Orderer.BatchTimeout)
			ord.BatchTimeout = genesisDefaults.Orderer.BatchTimeout
		case ord.BatchSize.MaxMessageCount == 0:
			logger.Infof("Orderer.BatchSize.MaxMessageCount unset, setting to %v", genesisDefaults.Orderer.BatchSize.MaxMessageCount)
			ord.BatchSize.MaxMessageCount = genesisDefaults.Orderer.BatchSize.MaxMessageCount
		case ord.BatchSize.AbsoluteMaxBytes == 0:
			logger.Infof("Orderer.BatchSize.AbsoluteMaxBytes unset, setting to %v", genesisDefaults.Orderer.BatchSize.AbsoluteMaxBytes)
			ord.BatchSize.AbsoluteMaxBytes = genesisDefaults.Orderer.BatchSize.AbsoluteMaxBytes
		case ord.BatchSize.PreferredMaxBytes == 0:
			logger.Infof("Orderer.BatchSize.PreferredMaxBytes unset, setting to %v", genesisDefaults.Orderer.BatchSize.PreferredMaxBytes)
			ord.BatchSize.PreferredMaxBytes = genesisDefaults.Orderer.BatchSize.PreferredMaxBytes
		default:
			break loop
		}
	}

	logger.Infof("orderer type: %s", ord.OrdererType)
	// Additional, consensus type-dependent initialization goes here
	// Also using this to panic on unknown orderer type.
	switch ord.OrdererType {
	case "solo":
		// nothing to be done here
	case "kafka":
		if ord.Kafka.Brokers == nil {
			logger.Infof("Orderer.Kafka unset, setting to %v", genesisDefaults.Orderer.Kafka.Brokers)
			ord.Kafka.Brokers = genesisDefaults.Orderer.Kafka.Brokers
		}
	case EtcdRaft:
		if ord.EtcdRaft == nil {
			logger.Panicf("%s configuration missing", EtcdRaft)
		}
		if ord.EtcdRaft.Options == nil {
			logger.Infof("Orderer.EtcdRaft.Options unset, setting to %v", genesisDefaults.Orderer.EtcdRaft.Options)
			ord.EtcdRaft.Options = genesisDefaults.Orderer.EtcdRaft.Options
		}
	second_loop:
		for {
			switch {
			case ord.EtcdRaft.Options.TickInterval == "":
				logger.Infof("Orderer.EtcdRaft.Options.TickInterval unset, setting to %v", genesisDefaults.Orderer.EtcdRaft.Options.TickInterval)
				ord.EtcdRaft.Options.TickInterval = genesisDefaults.Orderer.EtcdRaft.Options.TickInterval

			case ord.EtcdRaft.Options.ElectionTick == 0:
				logger.Infof("Orderer.EtcdRaft.Options.ElectionTick unset, setting to %v", genesisDefaults.Orderer.EtcdRaft.Options.ElectionTick)
				ord.EtcdRaft.Options.ElectionTick = genesisDefaults.Orderer.EtcdRaft.Options.ElectionTick

			case ord.EtcdRaft.Options.HeartbeatTick == 0:
				logger.Infof("Orderer.EtcdRaft.Options.HeartbeatTick unset, setting to %v", genesisDefaults.Orderer.EtcdRaft.Options.HeartbeatTick)
				ord.EtcdRaft.Options.HeartbeatTick = genesisDefaults.Orderer.EtcdRaft.Options.HeartbeatTick

			case ord.EtcdRaft.Options.MaxInflightBlocks == 0:
				logger.Infof("Orderer.EtcdRaft.Options.MaxInflightBlocks unset, setting to %v", genesisDefaults.Orderer.EtcdRaft.Options.MaxInflightBlocks)
				ord.EtcdRaft.Options.MaxInflightBlocks = genesisDefaults.Orderer.EtcdRaft.Options.MaxInflightBlocks

			case ord.EtcdRaft.Options.SnapshotIntervalSize == 0:
				logger.Infof("Orderer.EtcdRaft.Options.SnapshotIntervalSize unset, setting to %v", genesisDefaults.Orderer.EtcdRaft.Options.SnapshotIntervalSize)
				ord.EtcdRaft.Options.SnapshotIntervalSize = genesisDefaults.Orderer.EtcdRaft.Options.SnapshotIntervalSize

			case len(ord.EtcdRaft.Consenters) == 0:
				logger.Panicf("%s configuration did not specify any consenter", EtcdRaft)

			default:
				break second_loop
			}
		}

		if _, err := time.ParseDuration(ord.EtcdRaft.Options.TickInterval); err != nil {
			logger.Panicf("Etcdraft TickInterval (%s) must be in time duration format", ord.EtcdRaft.Options.TickInterval)
		}

		// validate the specified members for Options
		if ord.EtcdRaft.Options.ElectionTick <= ord.EtcdRaft.Options.HeartbeatTick {
			logger.Panicf("election tick must be greater than heartbeat tick")
		}

		for _, c := range ord.EtcdRaft.GetConsenters() {
			if c.Host == "" {
				logger.Panicf("consenter info in %s configuration did not specify host", EtcdRaft)
			}
			if c.Port == 0 {
				logger.Panicf("consenter info in %s configuration did not specify port", EtcdRaft)
			}
			if c.ClientTlsCert == nil {
				logger.Panicf("consenter info in %s configuration did not specify client TLS cert", EtcdRaft)
			}
			if c.ServerTlsCert == nil {
				logger.Panicf("consenter info in %s configuration did not specify server TLS cert", EtcdRaft)
			}
			clientCertPath := string(c.GetClientTlsCert())
			cf.TranslatePathInPlace(configDir, &clientCertPath)
			c.ClientTlsCert = []byte(clientCertPath)
			serverCertPath := string(c.GetServerTlsCert())
			cf.TranslatePathInPlace(configDir, &serverCertPath)
			c.ServerTlsCert = []byte(serverCertPath)
		}
	default:
		logger.Panicf("unknown orderer type: %s", ord.OrdererType)
	}
}

func translatePaths(configDir string, org *Organization) {
	cf.TranslatePathInPlace(configDir, &org.MSPDir)
}

// configCache stores marshalled bytes of config structures that produced from
// EnhancedExactUnmarshal. Cache key is the path of the configuration file that was used.
type configCache struct {
	mutex sync.Mutex
	cache map[string][]byte
}

var cache = &configCache{
	cache: make(map[string][]byte),
}

// load loads the TopLevel config structure from configCache.
// if not successful, it unmarshal a config file, and populate configCache
// with marshaled TopLevel struct.
func (c *configCache) load(config *viper.Viper, configPath string) (*TopLevel, error) {
	c.mutex.Lock()
	defer c.mutex.Unlock()

	conf := &TopLevel{}
	serializedConf, ok := c.cache[configPath]
	logger.Debug("Loading configuration from cache :%v", ok)
	if !ok {
		err := viperutil.EnhancedExactUnmarshal(config, conf)
		if err != nil {
			return nil, fmt.Errorf("Error unmarshaling config into struct: %s", err)
		}

		serializedConf, err = json.Marshal(conf)
		if err != nil {
			return nil, err
		}
		c.cache[configPath] = serializedConf
	}

	err := json.Unmarshal(serializedConf, conf)
	if err != nil {
		return nil, err
	}
	return conf, nil
}
