pragma solidity ^0.4.0;

contract CrowdFunding{
    
    // 捐赠者 
    struct funder{
        address funderAddress;
        uint money;  // 捐赠的钱
    }
    
    // 需求者
    struct needer{
        address neederAddress;
        uint goal;    // 目标募集金额
        uint amount;  // 已募集到的金额 
        uint funderAccount;  // 捐赠者数量
        mapping(uint => funder) funderMap;
    }
    
    uint neederAmount;   // 需求者数量
    mapping(uint => needer) neederMap;  
    
    // new一个需求者(一个众筹)
    function NewCrowd(address _neederAddress, uint _goal){
        neederAmount++;
        neederMap[neederAmount]= needer(_neederAddress, _goal, 0, 0);
        
    }
    
    // 捐赠者捐赠
    function donation(address _address, uint _neederId) payable{  // 传递捐赠者的地址和id
        needer storage _needer = neederMap[_neederId];    // 传入需求者的Id
        _needer.amount += msg.value;   // 将捐赠者捐赠的金额加到需求者已募捐到的金额上
        _needer.funderAccount++;       // 捐赠者个数加一(未考虑捐赠者的id是否重复)
        _needer.funderMap[_needer.funderAccount] = funder(_address, msg.value);  //(看不懂)
    }
    
    // 判断募捐是否完成
    function isComplete(uint _neederAmount){
        needer storage _needer = neederMap[_neederAmount];    // 传入需求者的Id
        
        if(_needer.amount >= _needer.goal){  //判断募捐的金额是否达到目标募捐金额 
            _needer.neederAddress.transfer(_needer.amount);  // 讲金额转移到需求者的地址上
        }
    }
    
    // 测试函数
    function test() view returns(uint, uint, uint){
        return (neederMap[1].goal, neederMap[1].amount, neederMap[1].funderAccount);
    }
}