import ckanapi #https://github.com/open-data/ckanapi
import errno, os, shutil, sys, glob
from pprint import pprint 
from email.mime.text import MIMEText
from subprocess import Popen, PIPE
import tempfile
from zipfile import ZipFile
import urllib
import fileinput
import json
import psycopg2
import requests
 
geoserver_addr = "http://localhost:8080/geoserver/"
geoserver_user = "admin"
geoserver_passwd = "geoserver"
email_addr = "maxious@lambdacomplex.org"
shp2pgsql = "/usr/lib/postgresql/9.2/bin/shp2pgsql"
omitted_orgs = []
 
def email(subject, body):
        msg = MIMEText(body)
        msg["From"] = "ckan@localhost"
        msg["To"] = email_addr
        msg["Subject"] = subject
        # Send the message via our own SMTP server, but don't include the
        # envelope header.
        s = smtplib.SMTP('localhost')
        s.sendmail(msg["From"], [msg["To"]], msg.as_string())
        s.quit()
 
def success(msg):
        print "Completed!"
#       email("geodata success",msg)
        sys.exit(errno.EACCES)
 
def failure(msg):
        print "ERROR -"+msg
#       email("geodata error",str(sys.argv)+msg)
        sys.exit(errno.EACCES)
 
def get_cursor(db_settings):
 
        # Connect to an existing database
        try:
            conn = psycopg2.connect(dbname=db_settings['dbname'], user=db_settings['user'], password=db_settings['password'], host=db_settings['host'])
        except:
            failure("I am unable to connect to the database.")
        # Open a cursor to perform database operations
        cur = conn.cursor()
        conn.set_isolation_level(0)
        # Execute a command: this creates a new table
        #cur.execute("create extension postgis")
        return (cur,conn)
 
def psql_load(proc):
        (cur,conn) = get_cursor(db_settings)
        sql = ""
        for line in iter(proc.stdout.readline,''):
            sql += line
            if sql.endswith(';'):
                cur.execute(sql)
                sql = ""
        if sql != "":
                cur.execute(sql)
        cur.close()
        conn.close()
 
if len(sys.argv) != 5:
        print "spatial ingester. command line: postgis_url api_url api_key dataset_id"
        sys.exit(errno.EACCES)
else:
        (path, db_settings_json, api_url, api_key, dataset_id) = sys.argv
        db_settings = json.loads(db_settings_json)
 
ckan = ckanapi.RemoteCKAN(address=api_url, apikey=api_key)
dataset = ckan.action.package_show(id=dataset_id)
print "loaded dataset"+dataset['name']
#pprint(dataset)
if dataset['owner_org'] in omitted_orgs:
        print(dataset.owner_org + " in omitted_orgs")
        sys.exit(0);
 
ows_resources = []
kml_resources = []
shp_resources = []
data_modified_date = None
for resource in dataset['resources']:
        if "wms" in resource['format'] or "wfs" in resource['format']:
                if geoserver_addr not in resource['url'] :
                        failure(dataset['id']+" already has geo api");
                else:
                        ows_resources += [resource]
                
        if "kml" in resource['format']:
                kml_resources += [resource]
        if "shp" in resource['format']:
                shp_resources += [resource]
 
if len(shp_resources) == 0:
        print "No geodata format files detected"
        sys.exit(0);
 
#if geoserver api link does not exist or api link is out of date with data, continue
if len(ows_resources) > 0 and data_modified_date <= wms_resources[0]['last_modified']:
        print "Already up to date"
        sys.exit(0);
 
#email("geodata processing started for "+dataset['id'], str(sys.argv))
msg = ""
#download resource to tmpfile
 
#check filesize limit
 
(cur,conn) = get_cursor(db_settings)
table_name = dataset['id'].replace("-","_")
cur.execute("DROP TABLE IF EXISTS "+table_name)
cur.close()
conn.close()
 
tempdir = tempfile.mkdtemp(dataset['id'])
os.chdir(tempdir)
print tempdir+" created"
#load esri shapefiles
if len(shp_resources) > 0:
        print "using SHP file "+shp_resources[0]['url']
        (filepath,headers) = urllib.urlretrieve(shp_resources[0]['url'], "input.zip" )
        print "shp downlaoded"
        with ZipFile(filepath, 'r') as myzip:
                myzip.extractall()
        print "shp unziped"
        shpfiles = glob.glob("*.[sS][hH][pP]")
        prjfiles = glob.glob("*.[pP][rR][jJ]")
        if len(shpfiles) == 0:
                failure("no shp files found in zip "+shp_resources[0]['url'])
        print "converting to pgsql "+shpfiles[0]
        process = Popen([shp2pgsql,shpfiles[0], table_name], stdout=PIPE, stderr=PIPE)
        psql_load(process)
        if len(prjfiles) > 0:
                nativeCRS = open(prjfiles[0], 'r').read()
#else:
#       print "using KML file "+kml_resources[0]['url']
#       #if kml ogr2ogr http://gis.stackexchange.com/questions/33102/how-to-import-kml-file-with-custom-data-to-postgres-postgis-database
#       (filepath,headers) = urllib.urlretrieve(kml_resources[0]['url'], "input.kml")
 
 
#load bounding boxes
(cur,conn) = get_cursor(db_settings)
cur.execute('SELECT ST_Extent(geom) as box,ST_AsGeoJSON(ST_Extent(geom)) as geojson from '+table_name)
(bbox,bgjson) = cur.fetchone()
cur.close()
conn.close()
print bbox
 
 
#create geoserver dataset http://boundlessgeo.com/2012/10/adding-layers-to-geoserver-using-the-rest-api/
# name workspace after dataset
workspace = dataset['name']
ws = requests.post(geoserver_addr+'rest/workspaces', data=json.dumps({'workspace': {'name': workspace} }), headers={'Content-type': 'application/json'}, auth=('admin', 'geoserver'))
pprint(ws)
#echo ws.status_code
#echo ws.text
 
datastore = dataset['name']+'ds'
dsdata =json.dumps({'dataStore':{'name':datastore,
        'connectionParameters' : {
                 'host':db_settings['host'],
     'port':5432,
     'database': db_settings['dbname'],
     'schema':'public',
     'user':db_settings['user'],
     'passwd':db_settings['password'],
     'dbtype':'postgis'
 
                }}})
#print dsdata
r = requests.post(geoserver_addr+'rest/workspaces/'+workspace+'/datastores', data=dsdata, headers={'Content-type': 'application/json'}, auth=('admin', 'geoserver'))
pprint(r)
#echo r.status_code
#echo r.text
 
# name layer after resource title
ftdata = {'featureType':{'name':table_name, 'title': resource['name']}}
if nativeCRS != None:
        ftdata['featureType']['nativeCRS'] = nativeCRS
else:
        (minx,miny, maxx, maxy) = bbox.replace("BOX","").replace("(","").replace(")","").replace(","," ").split(" ")
        bbox_obj = { 'minx': minx,'maxx': maxx,'miny': miny,'maxy': maxy }
        ftdata['featureType']['nativeBoundingBox'] = bbox_obj
        ftdata['featureType']['latLonBoundingBox'] = bbox_obj
        ftdata['featureType']['srs'] = "EPSG:4326"
ftdata = json.dumps(ftdata)
r = requests.post(geoserver_addr+'rest/workspaces/'+workspace+'/datastores/'+datastore+"/featuretypes", data= ftdata, headers={'Content-Type': 'application/json'}, auth=('admin', 'geoserver'))
pprint(r)
 
#generate wms/wfs api links, kml, png resources and add to package
print bgjson
dataset['spatial'] = bgjson
# ckan.action.resource_update(id=resource['id'],url=resource['url'],name=resource['name'],     last_modified=datetime.now().isoformat())
#/geodatasetws/wms
#/geodatasetws/wfs
#http://cloudnine.lambdacomplex.org:8080/geoserver/tiger/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=tiger:tiger_roads&outputFormat=application/json
#http://cloudnine.lambdacomplex.org:8080/geoserver/tiger/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=tiger:tiger_roads&outputFormat=csv
 
#delete tempdir
shutil.rmtree(tempdir)
success(msg)