# This file is part of BOINC.
# http://boinc.berkeley.edu
# Copyright (C) 2016 University of California
#
# BOINC is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later version.
#
# BOINC 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with BOINC.  If not, see <http://www.gnu.org/licenses/>.


# Python bindings of the remote job submission and file management APIs

import urllib
import copy
import xml.etree.ElementTree as ET
import requests
    # you'll need to "yip install requests"

# represents an input file
#
class FILE_DESC:
    def __init__(self):
        return
    def to_xml(self):
        xml = ('<input_file>\n'
        '<mode>%s</mode>\n'
        ) %(self.mode)
        if self.mode == 'remote':
            xml += ('<url>%s</url>\n'
            '<nbytes>%f</nbytes>\n'
            '<md5>%s</md5>\n'
            ) %(self.url, self.nbytes, self.md5)
        else:
            xml += '<source>%s</source>\n' %(self.source)
        xml += '</input_file>\n'
        return xml

# represents a job
#
class JOB_DESC:
    def __init__(self):
        return
    def to_xml(self):
        xml = ('<job>\n'
        '<rsc_fpops_est>%f</rsc_fpops_est>\n'
        '<command_line>%s</command_line>\n'
        ) %(self.rsc_fpops_est, self.command_line)
        for file in self.files:
            xml += file.to_xml()
        xml += '</job>\n'
        return xml

# represents a batch description for submit() or estimate()
#
class BATCH_DESC:
    def __init__(self):
        return

    def to_xml(self, op):
        xml = ('<%s>\n'
        '<authenticator>%s</authenticator>\n'
        '<batch>\n'
        '<app_name>%s</app_name>\n'
        '<batch_name>%s</batch_name>\n'
        ) %(op, self.authenticator, self.app_name, self.batch_name)
        for job in self.jobs:
            xml += job.to_xml()
        xml += '</batch>\n</%s>\n' %(op)
        return xml

class CREATE_BATCH_REQ:
    def __init__(self):
        return
    def to_xml(self):
        xml = ('create_batch\n'
        '<authenticator>%s</authenticator>\n'
        '<app_name>%s</app_name>\n'
        '<batch_name>%s</batch_name>\n'
        '<expire_time>%f</expire_time>\n'
        '</create_batch>\n') %(self.authenticator, self.app_name, self.batch_name, self.expire_time)
        return xml

# a generic request
#
class REQUEST:
    def __init__(self):
        return

def do_http_post(req, project_url, handler='submit_rpc_handler.php'):
    url = project_url + handler
    params = urllib.urlencode({'request': req})
    f = urllib.urlopen(url, params)
    reply = f.read()
    print reply
    return ET.fromstring(reply)

########### API FUNCTIONS START HERE ###############

def abort_batch(req):
    req_xml = ('<abort_batch>\n'
    '<authenticator>%s</authenticator>\n'
    '<batch_id>%s</batch_id>\n'
    '</abort_batch>\n'
    ) %(req.authenticator, req.batch_id)
    return do_http_post(req_xml, req.project)

def abort_jobs(req):
    req_xml = ('<abort_jobs>\n'
    '<authenticator>%s</authenticator>\n'
    ) %(req.authenticator)
    for job in req.jobs:
        req_xml += '<job_name>%s</job_name>\n'%(job)
    req_xml += '</abort_jobs>\n'
    return do_http_post(req_xml, req.project)
    
def create_batch(req):
    return do_http_post(req.to_xml(), req.project)

def estimate_batch(req):
    return do_http_post(req.to_xml('estimate_batch'), req.project)

def query_batch(req):
    req_xml = ('<query_batch>\n'
    '<authenticator>%s</authenticator>\n'
    '<batch_id>%s</batch_id>\n'
    '<get_cpu_time>%d</get_cpu_time>\n'
    '</query_batch>\n'
    ) %(req.authenticator, req.batch_id, 1 if req.get_cpu_time else 0)
    return do_http_post(req_xml, req.project)

def query_batches(req):
    req_xml = ('<query_batches>\n'
    '<authenticator>%s</authenticator>\n'
    '<get_cpu_time>%d</get_cpu_time>\n'
    '</query_batches>\n'
    ) %(req.authenticator, 1 if req.get_cpu_time else 0)
    return do_http_post(req_xml, req.project)

def query_completed_job(req):
    req_xml = ('<query_completed_job>\n'
    '<authenticator>%s</authenticator>\n'
    '<job_name>%s</job_name>\n'
    '</query_completed_job>\n'
    ) %(req.authenticator, req.job_name)
    return do_http_post(req_xml, req.project)

def query_job(req):
    req_xml = ('<query_job>\n'
    '<authenticator>%s</authenticator>\n'
    '<job_id>%s</job_id>\n'
    '</query_job>\n'
    ) %(req.authenticator, req.job_id)
    return do_http_post(req_xml, req.project)

def get_output_file(req):
    auth_str = md5.new(req.authenticator+req.instance_name).digest()
    name = req.instance_name
    file_num = req.file_num
    return project_url+"/get_output.php?cmd=result_file&result_name=%s&file_num=%s&auth_str=%s"%(name, file_num, auth_str)

def get_output_files(req):
    auth_str = md5.new(req.authenticator+req.batch_id).digest()
    return project_url+"/get_output.php?cmd=batch_files&batch_id=%s&auth_str=%s"%(req.batch_id, auth_str)


def retire_batch(req):
    req_xml = ('<retire_batch>\n'
    '<authenticator>%s</authenticator>\n'
    '<batch_id>%s</batch_id>\n'
    '</retire_batch>\n'
    ) %(req.authenticator, req.batch_id)
    return do_http_post(req_xml, req.project)

def submit_batch(req):
    return do_http_post(req.to_xml('submit_batch'), req.project)


############ FILE MANAGEMENT API ##############

class QUERY_FILES_REQ:
    def __init__(self):
        return

    def to_xml(self):
        xml = ('<query_files>\n'
        '<authenticator>%s</authenticator>\n'
        '<batch_id>%d</batch_id>\n') %(self.authenticator, self.batch_id)
        for name in self.boinc_names:
            xml += '<md5>%s</md5>\n' %(name)
        xml += '</query_files>\n'
        return xml

class UPLOAD_FILES_REQ:
    def __init__(self):
        return

    def to_xml(self):
        xml = ('<upload_files>\n'
        '<authenticator>%s</authenticator>\n'
        '<batch_id>%d</batch_id>\n') %(self.authenticator, self.batch_id)
        for name in self.boinc_names:
            xml += '<md5>%s</md5>\n' %(name)
        xml += '</upload_files>\n'
        return xml

# This actually does two RPC:
# query_files() to find what files aren't already on server
# upload_files() to upload them
#
def upload_files(upload_files_req):
    query_req = QUERY_FILES_REQ()
    query_req.authenticator = upload_files_req.authenticator
    query_req.batch_id = upload_files_req.batch_id
    query_req.boinc_names = upload_files_req.boinc_names
    query_req_xml = query_req.to_xml()
    reply = do_http_post(query_req_xml, upload_files_req.project, 'job_file.php')
    if reply[0].tag == 'error':
        return reply

    absent = reply.find('absent_files').findall('file')
    #print 'query files succeeded; ',len(absent), ' files need upload'
    boinc_names = []
    local_names = []
    for n in absent:
        ind = int(n.text)
        boinc_names.append(upload_files_req.boinc_names[ind])
        local_names.append(upload_files_req.local_names[ind])
    upload_files_req.boinc_names = boinc_names
    upload_files_req.local_names = local_names

    # make a description of upoad files for "requests"
    #
    files = []
    for i in range(len(boinc_names)):
        bn = boinc_names[i]
        ln = local_names[i]
        upload_name = 'file_%d'%(i)
        files.append((upload_name, (bn, open(ln, 'rb'), 'application/octet-stream')))

    url = upload_files_req.project + '/job_file.php'
    req_xml = upload_files_req.to_xml()
    #print req_xml
    req = {'request': req_xml}
    reply = requests.post(url, data=req, files=files)
    #print "reply text: ", reply.text
    return ET.fromstring(reply.text)