/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package config

import (
	"fmt"
	"net/url"
	"strconv"
	"time"
)

import (
	"github.com/creasty/defaults"

	gxstrings "github.com/dubbogo/gost/strings"
)

import (
	"dubbo.apache.org/dubbo-go/v3/cluster/directory"
	"dubbo.apache.org/dubbo-go/v3/common"
	"dubbo.apache.org/dubbo-go/v3/common/constant"
	"dubbo.apache.org/dubbo-go/v3/common/extension"
	"dubbo.apache.org/dubbo-go/v3/common/proxy"
	"dubbo.apache.org/dubbo-go/v3/config/generic"
	"dubbo.apache.org/dubbo-go/v3/protocol"
	"dubbo.apache.org/dubbo-go/v3/protocol/protocolwrapper"
)

// ReferenceConfig is the configuration of service consumer
type ReferenceConfig struct {
	pxy            *proxy.Proxy
	id             string
	InterfaceName  string            `required:"true"  yaml:"interface"  json:"interface,omitempty" property:"interface"`
	Check          *bool             `default:"false" yaml:"check"  json:"check,omitempty" property:"check"`
	URL            string            `yaml:"url"  json:"url,omitempty" property:"url"`
	Filter         string            `yaml:"filter" json:"filter,omitempty" property:"filter"`
	Protocol       string            `default:"dubbo"  yaml:"protocol"  json:"protocol,omitempty" property:"protocol"`
	Registry       []string          `yaml:"registry"  json:"registry,omitempty"  property:"registry"`
	Cluster        string            `yaml:"cluster"  json:"cluster,omitempty" property:"cluster"`
	Loadbalance    string            `yaml:"loadbalance"  json:"loadbalance,omitempty" property:"loadbalance"`
	Retries        string            `yaml:"retries"  json:"retries,omitempty" property:"retries"`
	Group          string            `yaml:"group"  json:"group,omitempty" property:"group"`
	Version        string            `yaml:"version"  json:"version,omitempty" property:"version"`
	Serialization  string            `yaml:"serialization" json:"serialization" property:"serialization"`
	ProvidedBy     string            `yaml:"provided_by"  json:"provided_by,omitempty" property:"provided_by"`
	Methods        []*MethodConfig   `yaml:"methods"  json:"methods,omitempty" property:"methods"`
	Async          bool              `yaml:"async"  json:"async,omitempty" property:"async"`
	Params         map[string]string `yaml:"params"  json:"params,omitempty" property:"params"`
	invoker        protocol.Invoker
	urls           []*common.URL
	Generic        string `yaml:"generic"  json:"generic,omitempty" property:"generic"`
	Sticky         bool   `yaml:"sticky"   json:"sticky,omitempty" property:"sticky"`
	RequestTimeout string `yaml:"timeout"  json:"timeout,omitempty" property:"timeout"`
	ForceTag       bool   `yaml:"force.tag"  json:"force.tag,omitempty" property:"force.tag"`

	rootConfig   *RootConfig
	metaDataType string
}

// nolint
func (rc *ReferenceConfig) Prefix() string {
	return constant.ReferenceConfigPrefix + rc.InterfaceName + "."
}

func (rc *ReferenceConfig) Init(root *RootConfig) error {
	for _, method := range rc.Methods {
		if err := method.Init(); err != nil {
			return err
		}
	}
	if err := defaults.Set(rc); err != nil {
		return err
	}
	rc.rootConfig = root
	if root.Application != nil {
		rc.metaDataType = root.Application.MetadataType
	}
	rc.Registry = translateRegistryIds(rc.Registry)
	if len(rc.Registry) <= 0 {
		rc.Registry = root.Consumer.Registry
	}
	return verify(rc)
}

// Refer ...
func (rc *ReferenceConfig) Refer(srv interface{}) {
	cfgURL := common.NewURLWithOptions(
		common.WithPath(rc.InterfaceName),
		common.WithProtocol(rc.Protocol),
		common.WithParams(rc.getURLMap()),
		common.WithParamsValue(constant.BEAN_NAME_KEY, rc.id),
		common.WithParamsValue(constant.METADATATYPE_KEY, rc.metaDataType),
	)
	SetConsumerServiceByInterfaceName(rc.InterfaceName, srv)
	if rc.ForceTag {
		cfgURL.AddParam(constant.ForceUseTag, "true")
	}
	rc.postProcessConfig(cfgURL)
	if rc.URL != "" {
		// 1. user specified URL, could be peer-to-peer address, or register center's address.
		urlStrings := gxstrings.RegSplit(rc.URL, "\\s*[;]+\\s*")
		for _, urlStr := range urlStrings {
			serviceURL, err := common.NewURL(urlStr)
			if err != nil {
				panic(fmt.Sprintf("url configuration error,  please check your configuration, user specified URL %v refer error, error message is %v ", urlStr, err.Error()))
			}
			if serviceURL.Protocol == constant.REGISTRY_PROTOCOL {
				serviceURL.SubURL = cfgURL
				rc.urls = append(rc.urls, serviceURL)
			} else {
				if serviceURL.Path == "" {
					serviceURL.Path = "/" + rc.InterfaceName
				}
				// merge url need to do
				newURL := common.MergeURL(serviceURL, cfgURL)
				rc.urls = append(rc.urls, newURL)
			}
		}
	} else {
		// 2. assemble SubURL from register center's configuration mode
		rc.urls = loadRegistries(rc.Registry, rc.rootConfig.Registries, common.CONSUMER)

		// set url to regURLs
		for _, regURL := range rc.urls {
			regURL.SubURL = cfgURL
		}
	}

	if len(rc.urls) == 1 {
		if rc.urls[0].Protocol == constant.SERVICE_REGISTRY_PROTOCOL {
			rc.invoker = extension.GetProtocol("registry").Refer(rc.urls[0])
		} else {
			rc.invoker = extension.GetProtocol(rc.urls[0].Protocol).Refer(rc.urls[0])
		}

		// c.URL != "" is direct call
		if rc.URL != "" {
			//filter
			rc.invoker = protocolwrapper.BuildInvokerChain(rc.invoker, constant.REFERENCE_FILTER_KEY)

			// cluster
			invokers := make([]protocol.Invoker, 0, len(rc.urls))
			invokers = append(invokers, rc.invoker)
			// TODO(decouple from directory, config should not depend on directory module)
			var hitClu string
			// not a registry url, must be direct invoke.
			hitClu = constant.FAILOVER_CLUSTER_NAME
			if len(invokers) > 0 {
				u := invokers[0].GetURL()
				if nil != &u {
					hitClu = u.GetParam(constant.CLUSTER_KEY, constant.ZONEAWARE_CLUSTER_NAME)
				}
			}

			cluster := extension.GetCluster(hitClu)
			// If 'zone-aware' policy select, the invoker wrap sequence would be:
			// ZoneAwareClusterInvoker(StaticDirectory) ->
			// FailoverClusterInvoker(RegistryDirectory, routing happens here) -> Invoker
			rc.invoker = cluster.Join(directory.NewStaticDirectory(invokers))
		}
	} else {
		invokers := make([]protocol.Invoker, 0, len(rc.urls))
		var regURL *common.URL
		for _, u := range rc.urls {
			var invoker protocol.Invoker
			if u.Protocol == constant.SERVICE_REGISTRY_PROTOCOL {
				invoker = extension.GetProtocol("registry").Refer(u)
			} else {
				invoker = extension.GetProtocol(u.Protocol).Refer(u)
			}

			// c.URL != "" is direct call
			if rc.URL != "" {
				//filter
				invoker = protocolwrapper.BuildInvokerChain(invoker, constant.REFERENCE_FILTER_KEY)
			}
			invokers = append(invokers, invoker)
			if u.Protocol == constant.REGISTRY_PROTOCOL {
				regURL = u
			}
		}

		// TODO(decouple from directory, config should not depend on directory module)
		var hitClu string
		if regURL != nil {
			// for multi-subscription scenario, use 'zone-aware' policy by default
			hitClu = constant.ZONEAWARE_CLUSTER_NAME
		} else {
			// not a registry url, must be direct invoke.
			hitClu = constant.FAILOVER_CLUSTER_NAME
			if len(invokers) > 0 {
				u := invokers[0].GetURL()
				if nil != &u {
					hitClu = u.GetParam(constant.CLUSTER_KEY, constant.ZONEAWARE_CLUSTER_NAME)
				}
			}
		}

		cluster := extension.GetCluster(hitClu)
		// If 'zone-aware' policy select, the invoker wrap sequence would be:
		// ZoneAwareClusterInvoker(StaticDirectory) ->
		// FailoverClusterInvoker(RegistryDirectory, routing happens here) -> Invoker
		rc.invoker = cluster.Join(directory.NewStaticDirectory(invokers))
	}
	// publish consumer's metadata
	publishServiceDefinition(cfgURL)
	// create proxy
	if rc.Async {
		callback := GetCallback(rc.id)
		rc.pxy = extension.GetProxyFactory(rc.rootConfig.Consumer.ProxyFactory).GetAsyncProxy(rc.invoker, callback, cfgURL)
	} else {
		rc.pxy = extension.GetProxyFactory(rc.rootConfig.Consumer.ProxyFactory).GetProxy(rc.invoker, cfgURL)
	}
}

// Implement
// @v is service provider implemented RPCService
func (rc *ReferenceConfig) Implement(v common.RPCService) {
	rc.pxy.Implement(v)
}

// GetRPCService gets RPCService from proxy
func (rc *ReferenceConfig) GetRPCService() common.RPCService {
	return rc.pxy.Get()
}

// GetProxy gets proxy
func (rc *ReferenceConfig) GetProxy() *proxy.Proxy {
	return rc.pxy
}

func (rc *ReferenceConfig) getURLMap() url.Values {
	urlMap := url.Values{}
	// first set user params
	for k, v := range rc.Params {
		urlMap.Set(k, v)
	}
	urlMap.Set(constant.INTERFACE_KEY, rc.InterfaceName)
	urlMap.Set(constant.TIMESTAMP_KEY, strconv.FormatInt(time.Now().Unix(), 10))
	urlMap.Set(constant.CLUSTER_KEY, rc.Cluster)
	urlMap.Set(constant.LOADBALANCE_KEY, rc.Loadbalance)
	urlMap.Set(constant.RETRIES_KEY, rc.Retries)
	urlMap.Set(constant.GROUP_KEY, rc.Group)
	urlMap.Set(constant.VERSION_KEY, rc.Version)
	urlMap.Set(constant.GENERIC_KEY, rc.Generic)
	urlMap.Set(constant.ROLE_KEY, strconv.Itoa(common.CONSUMER))
	urlMap.Set(constant.PROVIDED_BY, rc.ProvidedBy)
	urlMap.Set(constant.SERIALIZATION_KEY, rc.Serialization)

	urlMap.Set(constant.RELEASE_KEY, "dubbo-golang-"+constant.Version)
	urlMap.Set(constant.SIDE_KEY, (common.RoleType(common.CONSUMER)).Role())

	if len(rc.RequestTimeout) != 0 {
		urlMap.Set(constant.TIMEOUT_KEY, rc.RequestTimeout)
	}
	// getty invoke async or sync
	urlMap.Set(constant.ASYNC_KEY, strconv.FormatBool(rc.Async))
	urlMap.Set(constant.STICKY_KEY, strconv.FormatBool(rc.Sticky))

	// applicationConfig info
	urlMap.Set(constant.APPLICATION_KEY, rc.rootConfig.Application.Name)
	urlMap.Set(constant.ORGANIZATION_KEY, rc.rootConfig.Application.Organization)
	urlMap.Set(constant.NAME_KEY, rc.rootConfig.Application.Name)
	urlMap.Set(constant.MODULE_KEY, rc.rootConfig.Application.Module)
	urlMap.Set(constant.APP_VERSION_KEY, rc.rootConfig.Application.Version)
	urlMap.Set(constant.OWNER_KEY, rc.rootConfig.Application.Owner)
	urlMap.Set(constant.ENVIRONMENT_KEY, rc.rootConfig.Application.Environment)

	// filter
	defaultReferenceFilter := constant.DEFAULT_REFERENCE_FILTERS
	if rc.Generic != "" {
		defaultReferenceFilter = constant.GENERIC_REFERENCE_FILTERS + "," + defaultReferenceFilter
	}
	urlMap.Set(constant.REFERENCE_FILTER_KEY, mergeValue(rc.rootConfig.Consumer.Filter, "", defaultReferenceFilter))

	for _, v := range rc.Methods {
		urlMap.Set("methods."+v.Name+"."+constant.LOADBALANCE_KEY, v.LoadBalance)
		urlMap.Set("methods."+v.Name+"."+constant.RETRIES_KEY, v.Retries)
		urlMap.Set("methods."+v.Name+"."+constant.STICKY_KEY, strconv.FormatBool(v.Sticky))
		if len(v.RequestTimeout) != 0 {
			urlMap.Set("methods."+v.Name+"."+constant.TIMEOUT_KEY, v.RequestTimeout)
		}
	}

	return urlMap
}

// GenericLoad ...
func (rc *ReferenceConfig) GenericLoad(id string) {
	genericService := generic.NewGenericService(rc.id)
	SetConsumerService(genericService)
	rc.id = id
	rc.Refer(genericService)
	rc.Implement(genericService)
}

// GetInvoker get invoker from ReferenceConfig
func (rc *ReferenceConfig) GetInvoker() protocol.Invoker {
	return rc.invoker
}

// postProcessConfig asks registered ConfigPostProcessor to post-process the current ReferenceConfig.
func (rc *ReferenceConfig) postProcessConfig(url *common.URL) {
	for _, p := range extension.GetConfigPostProcessors() {
		p.PostProcessReferenceConfig(url)
	}
}

//////////////////////////////////// reference config api

// ReferenceConfigOpt is consumer's reference config
type ReferenceConfigOpt func(config *ReferenceConfig) *ReferenceConfig

// NewReferenceConfig The only way to get a new ReferenceConfig
func NewReferenceConfigWithID(id string) *ReferenceConfig {
	return &ReferenceConfig{id: id}
}

// NewEmptyReferenceConfig returns empty ReferenceConfig
func NewEmptyReferenceConfig() *ReferenceConfig {
	newReferenceConfig := NewReferenceConfigWithID("")
	newReferenceConfig.Methods = make([]*MethodConfig, 0, 8)
	newReferenceConfig.Params = make(map[string]string, 8)
	return newReferenceConfig
}

// NewReferenceConfig returns ReferenceConfig with given @opts
func NewReferenceConfig(opts ...ReferenceConfigOpt) *ReferenceConfig {
	newReferenceConfig := NewEmptyReferenceConfig()
	for _, v := range opts {
		v(newReferenceConfig)
	}
	return newReferenceConfig
}

// WithReferenceRegistry returns ReferenceConfigOpt with given registryKey: @registry
func WithReferenceRegistry(registryKeys ...string) ReferenceConfigOpt {
	return func(config *ReferenceConfig) *ReferenceConfig {
		config.Registry = registryKeys
		return config
	}
}

// WithReferenceProtocolName returns ReferenceConfigOpt with given protocolName: @protocol
func WithReferenceProtocolName(protocol string) ReferenceConfigOpt {
	return func(config *ReferenceConfig) *ReferenceConfig {
		config.Protocol = protocol
		return config
	}
}

// WithReferenceInterface returns ReferenceConfigOpt with given @interfaceName
func WithReferenceInterface(interfaceName string) ReferenceConfigOpt {
	return func(config *ReferenceConfig) *ReferenceConfig {
		config.InterfaceName = interfaceName
		return config
	}
}

// WithReferenceCluster returns ReferenceConfigOpt with given cluster name: @cluster
func WithReferenceCluster(cluster string) ReferenceConfigOpt {
	return func(config *ReferenceConfig) *ReferenceConfig {
		config.Cluster = cluster
		return config
	}
}

// WithReferenceMethod returns ReferenceConfigOpt with given @method, @retries, and load balance: @lb
func WithReferenceMethod(methodName, retries, lb string) ReferenceConfigOpt {
	return func(config *ReferenceConfig) *ReferenceConfig {
		config.Methods = append(config.Methods, &MethodConfig{
			Name:        methodName,
			Retries:     retries,
			LoadBalance: lb,
		})
		return config
	}
}