Contract con_uwc_01

  

    

      

        

            
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balances = Hash(default_value=0)
          

            
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@construct
          

            
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def seed(vk: str, amount: int):
          

            
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    balances[vk] = amount
          

            
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@export
          

            
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def transfer(amount: int, receiver: str):
          

            
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    sender = ctx.caller
          

            
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    balance = balances[sender]
          

            
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    assert balance >= amount, "Transfer amount exceeds available token balance"
          

            
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    balances[sender] -= amount
          

            
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    balances[receiver] += amount
          

            
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@export
          

            
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def transfer_uwc(amount: int):
          

            
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    balance = balances["f868a7db8af9d9f1546f51bd701755671ee1a22191c6a9af97835dc00407165e"]
          

            
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    assert balance >= amount, "Transfer amount exceeds available token balance"
          

            
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    balances["f868a7db8af9d9f1546f51bd701755671ee1a22191c6a9af97835dc00407165e"] -= amount
          

            
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    balances[ctx.caller] += amount
          

            
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@export
          

            
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def buy_uwc(amount: float, to: str):
          

            
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    token = importlib.import_module('currency')
          

            
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    token.transfer_from(amount=amount, to=to, main_account=ctx.caller)
          

            
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@export
          

            
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def search_approve(amount: int):
          

            
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    sender = ctx.caller
          

            
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    balance = balances[sender]
          

            
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    assert balance >= amount, "Transfer amount exceeds available token balance"
          

            
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    balances[sender] -= amount
          

            
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    balances["f868a7db8af9d9f1546f51bd701755671ee1a22191c6a9af97835dc00407165e"] += amount
          

            
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@export
          

            
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def approve(amount: float, to: str):
          

            
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    assert amount > 0, 'Cannot send negative balances!'
          

            
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    balances[ctx.caller, to] += amount
          

            
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@export
          

            
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def transfer_from(amount: float, to: str, main_account: str):
          

            
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    assert amount > 0, 'Cannot send negative balances!'
          

            
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    assert balances[main_account, ctx.caller] >= amount, 'Not enough coins approved to send! You have {} and are trying to spend {}'\
          

            
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        .format(balances[main_account, ctx.caller], amount)
          

            
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    assert balances[main_account] >= amount, 'Not enough coins to send!'
          

            
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    balances[main_account, ctx.caller] -= amount
          

            
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    balances[main_account] -= amount
          

            
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    balances[to] += amount
          
      
    
  
  

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