diagram.plantuml

@startuml project-funding
Title: Project Funding via Smart Contract

Participant "Admin" as A
Participant "SmartContract" as SC
Participant "Investor" as I

A -> SC: createProject(projectId, fundingGoal)
activate SC
    SC -> SC: Project(id, fundingGoal, currentAmount, owner, isClosed)
    SC --> A: Event: ProjectCreated
deactivate SC

I -> SC: contribute(projectId)
activate SC
    SC -> SC: check(!isClosed)
    SC -> SC: check(contribution <= fundingGoal - currentAmount)
    alt contribution <= fundingGoal - currentAmount
        SC -> SC: currentAmount += contribution
        SC --> I: Event: ContributionMade
        alt currentAmount == fundingGoal
            SC -> SC: closeProject(projectId)
            SC --> I: Event: FullyFunded
        end
    else
        SC --> I: Error: "Contribution exceeds funding goal"
    end
deactivate SC

I -> SC: getProjectTotalAmount(projectId)
activate SC
    SC --> I: return currentAmount
deactivate SC
A -> SC: setFundingGoal(projectId, newFundingGoal)
activate SC
    SC -> SC: check(newFundingGoal >= currentAmount)
    alt newFundingGoal >= currentAmount
        SC -> SC: fundingGoal = newFundingGoal
        SC --> A: Event: FundingGoalUpdated
    else
        SC --> A: Error: "New funding goal cannot be less than the amount already raised"
    end
deactivate SC

A -> SC: closeProject(projectId)
activate SC
    SC -> SC: check(!isClosed)
    SC -> SC: isClosed = true
    SC --> A: Event: Closed
deactivate SC

A -> SC: withdrawFunds(projectId)
activate SC
    SC -> SC: check(currentAmount >= fundingGoal)
    SC -> SC: check(currentAmount <= SC.balance)
    SC -> SC: isClosed = true
    SC -> SC: owner.transfer(currentAmount)
    SC -> SC: currentAmount = 0
    SC --> A: Event: FundsWithdrawn
deactivate SC

@enduml