/*
Copyright IBM Corp. 2016 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 main


import (
	"fmt"
	"strconv"

	"github.com/hyperledger/fabric/core/chaincode/shim"
	pb "github.com/hyperledger/fabric/protos/peer"
)

var logger = shim.NewLogger("example_cc2")

// SimpleChaincode example simple Chaincode implementation
type SimpleChaincode struct {
}

// Re-initialize one of the parties' asset holdings
func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response  {

	logger.Info("########### example_cc2 Init ###########")

	_, args := stub.GetFunctionAndParameters()
	var A string    // Entities
	var Aval int // Asset holdings
	var err error

	// Initialize the chaincode
	A = args[0]
	Aval, err = strconv.Atoi(args[1])
	if err != nil {
		return shim.Error("Expecting integer value for asset holding")
	}
	logger.Info("Aval = %d\n", Aval)

	// Write the state to the ledger
	err = stub.PutState(A, []byte(strconv.Itoa(Aval)))
	if err != nil {
		return shim.Error(err.Error())
	}

	return shim.Success(nil)
}

// Transaction makes payment of X units from A to B
func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
	logger.Info("########### example_cc1 Invoke ###########")

	function, args := stub.GetFunctionAndParameters()

	if function == "query" {
		// queries an entity state
		return t.query(stub, args)
	}

	logger.Errorf("Unknown action: %s, check the first argument, must be 'query'", args[0])
	return shim.Error(fmt.Sprintf("Unknown action: %s, check the first argument, must be 'query'", args[0]))
}

// Query callback representing the query of a chaincode
func (t *SimpleChaincode) query(stub shim.ChaincodeStubInterface, args []string) pb.Response {

	var A string // Entities
	var err error

	if len(args) != 1 {
		return shim.Error("Incorrect number of arguments. Expecting name of the person to query")
	}

	A = args[0]

	// Get the state from the ledger
	Avalbytes, err := stub.GetState(A)
	if err != nil {
		jsonResp := "{\"Error\":\"Failed to get state for " + A + "\"}"
		return shim.Error(jsonResp)
	}

	if Avalbytes == nil {
		jsonResp := "{\"Error\":\"Nil amount for " + A + "\"}"
		return shim.Error(jsonResp)
	}

	jsonResp := "{\"Name\":\"" + A + "\",\"Amount\":\"" + string(Avalbytes) + "\"}"
	logger.Infof("Query Response:%s\n", jsonResp)
	return shim.Success(Avalbytes)
}

func main() {
	err := shim.Start(new(SimpleChaincode))
	if err != nil {
		logger.Errorf("Error starting Simple chaincode: %s", err)
	}
}