/*
Copyright IBM Corp. 2017 All Rights Reserved.

Licensed 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"

	"github.com/hyperledger/fabric/common/config/msp"
	cb "github.com/hyperledger/fabric/protos/common"
)

// ConsortiumProtos holds the config protos for the consortium config
type ConsortiumProtos struct {
	ChannelCreationPolicy *cb.Policy
}

// ConsortiumGroup stores the set of Consortium
type ConsortiumGroup struct {
	*Proposer
	*ConsortiumConfig

	mspConfig *msp.MSPConfigHandler
}

// NewConsortiumGroup creates a new *ConsortiumGroup
func NewConsortiumGroup(mspConfig *msp.MSPConfigHandler) *ConsortiumGroup {
	cg := &ConsortiumGroup{
		mspConfig: mspConfig,
	}
	cg.Proposer = NewProposer(cg)
	return cg
}

// NewGroup returns a Consortium instance
func (cg *ConsortiumGroup) NewGroup(name string) (ValueProposer, error) {
	return NewOrganizationGroup(name, cg.mspConfig), nil
}

// Allocate returns the resources for a new config proposal
func (cg *ConsortiumGroup) Allocate() Values {
	return NewConsortiumConfig(cg)
}

// BeginValueProposals calls through to Proposer after calling into the MSP config Handler
func (cg *ConsortiumGroup) BeginValueProposals(tx interface{}, groups []string) (ValueDeserializer, []ValueProposer, error) {
	return cg.Proposer.BeginValueProposals(tx, groups)
}

// PreCommit intercepts the precommit request and commits the MSP config handler before calling the underlying proposer
func (cg *ConsortiumGroup) PreCommit(tx interface{}) error {
	return cg.Proposer.PreCommit(tx)
}

// RollbackProposals intercepts the rollback request and commits the MSP config handler before calling the underlying proposer
func (cg *ConsortiumGroup) RollbackProposals(tx interface{}) {
	cg.Proposer.RollbackProposals(tx)
}

// CommitProposals intercepts the commit request and commits the MSP config handler before calling the underlying proposer
func (cg *ConsortiumGroup) CommitProposals(tx interface{}) {
	cg.Proposer.CommitProposals(tx)
}

// ConsortiumConfig holds the consoritums configuration information
type ConsortiumConfig struct {
	*standardValues
	protos *ConsortiumProtos
	orgs   map[string]*OrganizationGroup

	consortiumGroup *ConsortiumGroup
}

// NewConsortiumConfig creates a new instance of the consoritums config
func NewConsortiumConfig(cg *ConsortiumGroup) *ConsortiumConfig {
	cc := &ConsortiumConfig{
		protos:          &ConsortiumProtos{},
		orgs:            make(map[string]*OrganizationGroup),
		consortiumGroup: cg,
	}
	var err error
	cc.standardValues, err = NewStandardValues(cc.protos)
	if err != nil {
		logger.Panicf("Programming error: %s", err)
	}
	return cc
}

// Organizations returns the set of organizations in the consortium
func (cc *ConsortiumConfig) Organizations() map[string]*OrganizationGroup {
	return cc.orgs
}

// CreationPolicy returns the policy structure used to validate
// the channel creation
func (cc *ConsortiumConfig) ChannelCreationPolicy() *cb.Policy {
	return cc.protos.ChannelCreationPolicy
}

// Commit commits the ConsortiumConfig
func (cc *ConsortiumConfig) Commit() {
	cc.consortiumGroup.ConsortiumConfig = cc
}

// Validate builds the Consortium map
func (cc *ConsortiumConfig) Validate(tx interface{}, groups map[string]ValueProposer) error {
	var ok bool
	for key, group := range groups {
		cc.orgs[key], ok = group.(*OrganizationGroup)
		if !ok {
			return fmt.Errorf("Unexpected group type: %T", group)
		}
	}
	return nil
}