pragma solidity ^0.5.11;
pragma experimental ABIEncoderV2;
import "./erc721.sol";
import "./notebook.sol";
import "./ownable.sol";
contract AUAS_notebook is notebook, Ownable{
    uint fee_per_ch = 0.000001 ether;

    function withdraw() public payable onlyOwner returns(address){
         address payable _owner;
         _owner=owner();
         _owner.transfer(address(this).balance);
        // _owner.transfer(msg.value);
        // msg.sender.transfer(msg.value)
        return address(this);
    }
    function _createNote(string memory words) private{
        uint id = Note.push(note(words,msg.sender))-1;
        noteCount[msg.sender] = noteCount[msg.sender]+1;
        note2address[id] = msg.sender;
        emit WriteNote(words);
    }
    function createNote(string memory words) public payable{
        require(msg.value>=fee_per_ch*bytes(words).length);
        withdraw();
        _createNote(words);
    }

    function getAllNotes() external view returns(string[] memory){
        uint total_notes = noteCount[msg.sender];
        string[] memory ret_note = new string[](total_notes);
        uint c = 0;
        for(uint i=0;i<Note.length;i++){
            if (msg.sender==note2address[i]){
                ret_note[c]=Note[i].message;
                c++;
            }
        }
        return ret_note;
    }
}