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April 15, 2023 17:17
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| //SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.0; | |
| contract CropsSupplyChain{ | |
| //Define variable for tracking crop batch | |
| struct CropBatch{ | |
| string origin; | |
| string cropType; | |
| uint256 quantity; | |
| uint256 dateProduced; | |
| address producer; | |
| address[] handlers; | |
| address distributor; | |
| bool isCertified; | |
| } | |
| //Define variables for tracking certifications | |
| struct Certification{ | |
| address certifier; | |
| string standard; | |
| string result; | |
| uint256 dateCertified; | |
| } | |
| //batch ids to crops batach information | |
| mapping(uint256 => CropBatch) public cropsBatches; | |
| //mapping for batch ids to array of certification | |
| mapping(uint256 => Certification[]) public certifications; | |
| //counter for genreating batch ids | |
| uint256 public batchCounter = 0; | |
| //event for when new crop batch is created | |
| event CropBatchCreated(uint256 batchId, | |
| string origin, | |
| string cropType, | |
| uint256 quantity, | |
| uint256 dateProduced, | |
| address producer | |
| ); | |
| //event when crop batch is certified | |
| event CropBatchCertified(uint256 batchId, | |
| address certifier, | |
| string standard, | |
| string result, | |
| uint256 dateCertified); | |
| //function to created crop batch | |
| function createCropBatch(string memory _origin, | |
| string memory _cropType, | |
| uint256 _quantity, | |
| uint256 _dateProduced | |
| ) | |
| public { | |
| batchCounter++; | |
| CropBatch storage newBatch = cropsBatches[batchCounter]; | |
| newBatch.origin = _origin; | |
| newBatch.cropType = _cropType; | |
| newBatch.quantity = _quantity; | |
| newBatch.dateProduced = _dateProduced; | |
| newBatch.producer = msg.sender; | |
| emit CropBatchCreated(batchCounter,_origin,_cropType,_quantity,_dateProduced,msg.sender); | |
| } | |
| //function for adding a handler to crop batch | |
| function addHandler(uint256 _batchId,address _hanlder) public{ | |
| CropBatch storage batch = cropsBatches[_batchId]; | |
| require(batch.producer == msg.sender || batch.distributor==msg.sender || batch.handlers[batch.handlers.length-1]== msg.sender,"Only Producer,distributor and current handler can add a handler"); | |
| batch.handlers.push(_hanlder); | |
| } | |
| //function to certifyin a crop batch | |
| function certifyCropBatch(uint256 _batchId,string memory _standard,string memory _result ) | |
| public{ | |
| CropBatch storage batch = cropsBatches[_batchId]; | |
| require(batch.isCertified == false,"Batch is already certified"); | |
| require(batch.distributor == msg.sender,"Only distributor can certify a batch "); | |
| certifications[_batchId].push(Certification(msg.sender,_standard,_result,block.timestamp)); | |
| batch.isCertified = true; | |
| emit CropBatchCertified(_batchId,msg.sender,_standard,_result,block.timestamp); | |
| } | |
| //function for getting the certifications for a crop | |
| function getCropBatchCertifications(uint256 _batchId) public view returns(Certification[] memory){ | |
| return certifications[_batchId]; | |
| } | |
| } |
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