#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
    Blockstack
    ~~~~~
    copyright: (c) 2014-2015 by Halfmoon Labs, Inc.
    copyright: (c) 2016 by Blockstack.org

    This file is part of Blockstack

    Blockstack is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Blockstack is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    You should have received a copy of the GNU General Public License
    along with Blockstack. If not, see <http://www.gnu.org/licenses/>.
"""

from ..nameset import NAMEREC_FIELDS

# consensus hash fields (ORDER MATTERS!) 
FIELDS = NAMEREC_FIELDS + [
    'name_hash',            # hash(name)
    'consensus_hash',       # consensus hash when this operation was sent
    'keep_data'             # whether or not to keep the profile data associated with the name when transferred
]

def get_transfer_recipient_from_outputs( outputs ):
    """
    Given the outputs from a name transfer operation,
    find the recipient's script hex.
    
    By construction, it will be the first non-OP_RETURN 
    output (i.e. the second output).

    This also applies to a NAME_IMPORT.
    """
    
    ret = None
    for output in outputs:
       
        output_script = output['scriptPubKey']
        output_asm = output_script.get('asm')
        output_hex = output_script.get('hex')
        output_addresses = output_script.get('addresses')
        
        if output_asm[0:9] != 'OP_RETURN' and output_hex:
            
            ret = output_hex
            break
            
    if ret is None:
       raise Exception("No recipients found")
    
    return ret