/*
 * 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.
 */

/*
 * The sample smart contract for documentation topic:
 * Writing Your First Blockchain Application
 */

package main

/* Imports
 * 4 utility libraries for formatting, handling bytes, reading and writing JSON, and string manipulation
 * 2 specific Hyperledger Fabric specific libraries for Smart Contracts
 */
import (
	"bytes"
	"encoding/json"
	"fmt"
	"strconv"

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

// Define the Smart Contract structure
type SmartContract struct {
}

type Car struct {
	Make   string `json:"make"`
	Model  string `json:"model"`
	Colour string `json:"colour"`
	Owner  string `json:"owner"`l
}

type User struct {
	User_id   string `json:"user_id"`
	User_name   string `json:"user_name"`
	Description_user  string `json:"description_user"`
	User_Disponibility string `json:"user_disponibility"`
	Skills_user Skills `json:"skills_user"`
	Trainings_user Trainings `json:"trainings_user"`
}



type Skills struct {
	Skill_id string `json:"skill_id"`
	Skill_Name   string `json:"skill_name"`
	Skill_Level  string `json:"skill_level"`
}

type Trainings struct {
	Training_id   string `json:"training_id"`
	Training_name   string `json:"training_name"`
}

// Define the car structure, with 4 properties.  Structure tags are used by encoding/json library
type Project struct {
	Title   string `json:"title"`
	Description  string `json:"description"`
	Startdate string `json:"startdate"`
	Enddate  string `json:"enddate"`
	Skills_needed string `json:"skillsneeded"`
	Trainings_needed string `json:"trainingsneeded"`
	State string `json:"state"`

}



/*
 * The Init method is called when the Smart Contract "fabcar" is instantiated by the blockchain network
 * Best practice is to have any Ledger initialization in separate function -- see initLedger()
 */
func (s *SmartContract) Init(APIstub shim.ChaincodeStubInterface) sc.Response {
	return shim.Success(nil)
}

/*
 * The Invoke method is called as a result of an application request to run the Smart Contract "fabcar"
 * The calling application program has also specified the particular smart contract function to be called, with arguments
 */
func (s *SmartContract) Invoke(APIstub shim.ChaincodeStubInterface) sc.Response {

	// Retrieve the requested Smart Contract function and arguments
	function, args := APIstub.GetFunctionAndParameters()
	// Route to the appropriate handler function to interact with the ledger appropriately
	if function == "queryCar" {
		return s.queryCar(APIstub, args)
	} else if function == "initLedger" {
		return s.initLedger(APIstub)
	} else if function == "createCar" {
		return s.createCar(APIstub, args)
	} else if function == "queryAllCars" {
		return s.queryAllCars(APIstub)
	} else if function == "changeCarOwner" {
		return s.changeCarOwner(APIstub, args)
	} else if function == "queryAllProjects" {
		return s.queryAllProjects(APIstub)
	} else if function == "validAcceptance" {
		return s.validAcceptance(APIstub, args)
	} else if function == "createProject" {
		return s.createProject(APIstub, args)
	} else if function == "terminate" {
		return s.terminate(APIstub, args)
	} else if function == "validCreation" {
		return s.validCreation(APIstub, args)
	} else if function == "accept" {
		return s.accept(APIstub, args)
	} else if function == "createSkill" {
		return s.accept(APIstub, args)
	}


	return shim.Error("Invalid Smart Contract function name.")
}

func (s *SmartContract) queryCar(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

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

	carAsBytes, _ := APIstub.GetState(args[0])
	return shim.Success(carAsBytes)
}

func (s *SmartContract) initLedger(APIstub shim.ChaincodeStubInterface) sc.Response {
	/* cars := []Car{
		Car{Make: "Toyota", Model: "Prius", Colour: "blue", Owner: "Tomoko"},
		Car{Make: "Ford", Model: "Mustang", Colour: "red", Owner: "Brad"},
		Car{Make: "Hyundai", Model: "Tucson", Colour: "green", Owner: "Jin Soo"},
		Car{Make: "Volkswagen", Model: "Passat", Colour: "yellow", Owner: "Max"},
		Car{Make: "Tesla", Model: "S", Colour: "black", Owner: "Adriana"},
		Car{Make: "Peugeot", Model: "205", Colour: "purple", Owner: "Michel"},
		Car{Make: "Chery", Model: "S22L", Colour: "white", Owner: "Aarav"},
		Car{Make: "Fiat", Model: "Punto", Colour: "violet", Owner: "Pari"},
		Car{Make: "Tata", Model: "Nano", Colour: "indigo", Owner: "Valeria"},
		Car{Make: "Holden", Model: "Barina", Colour: "brown", Owner: "Shotaro"},
	}

	i := 0
	for i < len(cars) {
		fmt.Println("i is ", i)
		carAsBytes, _ := json.Marshal(cars[i])
		APIstub.PutState("CAR"+strconv.Itoa(i), carAsBytes)
		fmt.Println("Added", cars[i])
		i = i + 1
	}

	*/







	project := []Project{Project{Title: "titre", Description: "descriptionprojet", Startdate: "01/10/18", Enddate: "02/10/18", Skills_needed: "angular", Trainings_needed: "Polytechnique", State: "en cours"}}



	i := 0
	for i < len(project) {
		fmt.Println("i is ", i)
		projectAsBytes, _ := json.Marshal(project[i])
		APIstub.PutState("PROJECT"+strconv.Itoa(i), projectAsBytes)
		fmt.Println("Added", project[i])
		i = i + 1
	}



	return shim.Success(nil)
}

func (s *SmartContract) createCar(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

	if len(args) != 5 {
		return shim.Error("Incorrect number of arguments. Expecting 5")
	}

	var car = Car{Make: args[1], Model: args[2], Colour: args[3], Owner: args[4]}

	carAsBytes, _ := json.Marshal(car)
	APIstub.PutState(args[0], carAsBytes)

	return shim.Success(nil)
}


func (s *SmartContract) createProject(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

	if len(args) != 8 {
		return shim.Error("Incorrect number of arguments. Expecting 8")
	}

	var project = User{Title: args[1], Description: args[2], Startdate: args[3], Enddate: args[4], Skills_needed: args[5], Trainings_needed: args[6], State: args[7]}

	projectAsBytes, _ := json.Marshal(project)
	APIstub.PutState(args[0], projectAsBytes)

	return shim.Success(nil)
}


func (s *SmartContract) createUser(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {



	if len(args) != 8 {
		return shim.Error("Incorrect number of arguments. Expecting 8")
	}

	var user = Project{Title: args[1], Description: args[2], Startdate: args[3], Enddate: args[4], Skills_needed: args[5], Trainings_needed: args[6], State: args[7]}

	projectAsBytes, _ := json.Marshal(project)
	APIstub.PutState(args[0], projectAsBytes)

	return shim.Success(nil)
}



func (s *SmartContract) createSkill(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

	if len(args) != 6 {
		return shim.Error("Incorrect number of arguments. Expecting 5")
	}



	var skill = Skills{Name: args[1], Level: args[2], Projects_skill: args[3], OwnedBy: args[4], State_Skills: args[5]}

	SkillsAsBytes, _ := json.Marshal(skill)
	APIstub.PutState(args[0], SkillsAsBytes)

	return shim.Success(nil)
}

func (s *SmartContract) createSkill(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

	if len(args) != 6 {
		return shim.Error("Incorrect number of arguments. Expecting 5")
	}



	var skill = Skills{Name: args[1], Level: args[2], Projects_skill: args[3], OwnedBy: args[4], State_Skills: args[5]}

	SkillsAsBytes, _ := json.Marshal(skill)
	APIstub.PutState(args[0], SkillsAsBytes)

	return shim.Success(nil)
}

func (s *SmartContract) queryAllProjects(APIstub shim.ChaincodeStubInterface) sc.Response {

	startKey := "PROJECT0"
	endKey := "PROJECT999"

	resultsIterator, err := APIstub.GetStateByRange(startKey, endKey)
	if err != nil {
		return shim.Error(err.Error())
	}
	defer resultsIterator.Close()

	// buffer is a JSON array containing QueryResults
	var buffer bytes.Buffer
	buffer.WriteString("[")

	bArrayMemberAlreadyWritten := false
	for resultsIterator.HasNext() {
		queryResponse, err := resultsIterator.Next()
		if err != nil {
			return shim.Error(err.Error())
		}
		// Add a comma before array members, suppress it for the first array member
		if bArrayMemberAlreadyWritten == true {
			buffer.WriteString(",")
		}
		buffer.WriteString("{\"Key\":")
		buffer.WriteString("\"")
		buffer.WriteString(queryResponse.Key)
		buffer.WriteString("\"")

		buffer.WriteString(", \"Record\":")
		// Record is a JSON object, so we write as-is
		buffer.WriteString(string(queryResponse.Value))
		buffer.WriteString("}")
		bArrayMemberAlreadyWritten = true
	}
	buffer.WriteString("]")

	fmt.Printf("- queryAllCars:\n%s\n", buffer.String())

	return shim.Success(buffer.Bytes())
}



func (s *SmartContract) queryAllCars(APIstub shim.ChaincodeStubInterface) sc.Response {

	startKey := "CAR0"
	endKey := "CAR999"

	resultsIterator, err := APIstub.GetStateByRange(startKey, endKey)
	if err != nil {
		return shim.Error(err.Error())
	}
	defer resultsIterator.Close()

	// buffer is a JSON array containing QueryResults
	var buffer bytes.Buffer
	buffer.WriteString("[")

	bArrayMemberAlreadyWritten := false
	for resultsIterator.HasNext() {
		queryResponse, err := resultsIterator.Next()
		if err != nil {
			return shim.Error(err.Error())
		}
		// Add a comma before array members, suppress it for the first array member
		if bArrayMemberAlreadyWritten == true {
			buffer.WriteString(",")
		}
		buffer.WriteString("{\"Key\":")
		buffer.WriteString("\"")
		buffer.WriteString(queryResponse.Key)
		buffer.WriteString("\"")

		buffer.WriteString(", \"Record\":")
		// Record is a JSON object, so we write as-is
		buffer.WriteString(string(queryResponse.Value))
		buffer.WriteString("}")
		bArrayMemberAlreadyWritten = true
	}
	buffer.WriteString("]")

	fmt.Printf("- queryAllCars:\n%s\n", buffer.String())

	return shim.Success(buffer.Bytes())
}

func (s *SmartContract) changeCarOwner(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

	if len(args) != 2 {
		return shim.Error("Incorrect number of arguments. Expecting 2")
	}

	carAsBytes, _ := APIstub.GetState(args[0])
	car := Car{}

	json.Unmarshal(carAsBytes, &car)
	car.Owner = args[1]

	carAsBytes, _ = json.Marshal(car)
	APIstub.PutState(args[0], carAsBytes)

	return shim.Success(nil)
}

func (s *SmartContract) validCreation(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

	if len(args) != 2 {
		return shim.Error("Incorrect number of arguments. Expecting 2")
	}

	projectAsBytes, _ := APIstub.GetState(args[0])
	project := Project{}

	json.Unmarshal(projectAsBytes, &project)
	project.State = args[1]

	projectAsBytes, _ = json.Marshal(project)
	APIstub.PutState(args[0], projectAsBytes)

	return shim.Success(nil)
}

func (s *SmartContract) accept(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

	if len(args) != 2 {
		return shim.Error("Incorrect number of arguments. Expecting 2")
	}

	projectAsBytes, _ := APIstub.GetState(args[0])
	project := Project{}

	json.Unmarshal(projectAsBytes, &project)
	project.State = args[1]

	projectAsBytes, _ = json.Marshal(project)
	APIstub.PutState(args[0], projectAsBytes)

	return shim.Success(nil)
}

func (s *SmartContract) validAcceptance(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

	if len(args) != 2 {
		return shim.Error("Incorrect number of arguments. Expecting 2")
	}

	projectAsBytes, _ := APIstub.GetState(args[0])
	project := Project{}

	json.Unmarshal(projectAsBytes, &project)
	project.State = args[1]

	projectAsBytes, _ = json.Marshal(project)
	APIstub.PutState(args[0], projectAsBytes)

	return shim.Success(nil)
}


func (s *SmartContract) terminate(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

	if len(args) != 2 {
		return shim.Error("Incorrect number of arguments. Expecting 2")
	}

	projectAsBytes, _ := APIstub.GetState(args[0])
	project := Project{}

	json.Unmarshal(projectAsBytes, &project)
	project.State = args[1]

	projectAsBytes, _ = json.Marshal(project)
	APIstub.PutState(args[0], projectAsBytes)

	return shim.Success(nil)
}




// The main function is only relevant in unit test mode. Only included here for completeness.
func main() {

	// Create a new Smart Contract
	err := shim.Start(new(SmartContract))
	if err != nil {
		fmt.Printf("Error creating new Smart Contract: %s", err)
	}
}