@startuml
'https://plantuml.com/sequence-diagram

title: Undelegate

msgServer -> keeper : Undelegate(delAddr, valAddr, tokenAmount)

keeper -> keeper : calculate number of shares the tokenAmount represents

alt wrong denom
    msgServer <-- keeper : error
end

group Unbond(delAddr, valAddr, shares)
    keeper -> keeper: BeforeDelegationSharesModified hook
    alt no such delegation
        keeper --> msgServer : error
    end
    alt not enough shares
        keeper --> msgServer : error
    end
    alt delegator is the operator of the validator\nand validator is not already jailed\nand unbonding would put self-delegation under min threshold
                keeper -> keeper : jail the validator, but proceed with unbonding
                note left : Default min delegation threshold : 1 share
    end

    database store

    alt complete unbonding, all shares removed
        keeper -> store : remove delegation object
    else there are still shares delegated (not a complete undbonding)
        keeper -> store : update delegation object
        keeper -> keeper : AfterDelegationModified hook
    end

    keeper -> store : update validator power index
    keeper -> store : update validator information (including token amount)

    alt validator status is "unbonded" and it has no more tokens
       keeper -> store : delete the validator
       note right : otherwise, do this in EndBlock once validator is unbonded
    end
end

alt validator is bonded
    keeper -> bankKeeper : send tokens from bonded pool to not bonded pool
end

msgServer -> msgServer : emit event : EventTypeUnbond(delAddr, valAddr, tokenAmount, completion time)

@enduml