import pycrs




###########################
# Drawing routine for testing
def render_world(crs):
    import urllib2
    import json
    import pygeoj
    import pyagg
    import pyproj
    import random
    c = pyagg.Canvas(600,600)
    c.geographic_space()
    raw = urllib2.urlopen("https://raw.githubusercontent.com/johan/world.geo.json/master/countries.geo.json").read()
    rawdict = json.loads(raw)
    data = pygeoj.load(data=rawdict)
    proj4 = crs.to_proj4()
    fromproj = pyproj.Proj("+init=EPSG:4326")
    toproj = pyproj.Proj(proj4)

    print data.bbox
    for feat in data:
        if feat.geometry.type == "Polygon":
            feat.geometry.coordinates = [zip(*pyproj.transform(fromproj, toproj, zip(*ring)[0], zip(*ring)[1]))
                                         for ring in feat.geometry.coordinates]
        elif feat.geometry.type == "MultiPolygon":
            feat.geometry.coordinates = [
                                        [zip(*pyproj.transform(fromproj, toproj, zip(*ring)[0], zip(*ring)[1]))
                                         for ring in poly]
                                         for poly in feat.geometry.coordinates]
    data.add_all_bboxes()
    xmins, ymins, xmaxs, ymaxs = zip(*(feat.geometry.bbox for feat in data))
    bbox = (min(xmins), min(ymins), max(xmaxs), max(ymaxs))#33333, 33333) # to avoid inf bounds and no render
    # print data.bbox #PYGEOJ data.bbox doesnt update.........FIX!
    print bbox
    c.zoom_bbox(*bbox)
    for feat in data:
        try: c.draw_geojson(feat.geometry,
                            fillcolor=tuple(random.randrange(255) for _ in range(3)),
                            outlinecolor="white")
        except:
            # NOTE: feat.__geo_interface__ is one level too high maybe??
            print feat.geometry
    c.view()






###########################
# OGC WKT
print "testing ogc wkt"
crs = pycrs.parser.from_sr_code(54030)
#crs = pycrs.parser.from_sr_code(22)
print crs.to_proj4()
wkt = crs.to_ogc_wkt()
print "Original:", wkt
print "Reconstructed:", pycrs.parser.from_ogc_wkt(wkt).to_ogc_wkt()

render_world(crs)




###########################
# PROJ4
print "testing proj4"
#proj4 = "+proj=robin +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"
#proj4 = "+proj=longlat +ellps=WGS84 +datum=WGS84"
#proj4 = "+proj=aea +lat_1=24 +lat_2=31.5 +lat_0=24 +lon_0=-84 +x_0=400000 +y_0=0 +ellps=GRS80 +units=m +no_defs "
proj4 = "+proj=larr +datum=WGS84 +lon_0=0 +lat_ts=45 +x_0=0 +y_0=0 +ellps=WGS84 +units=m +no_defs"
#proj4 = "+proj=nsper +datum=WGS84 +ellps=WGS84 +lon_0=44 +lat_0=30 +h=200000000"

#crs = pycrs.parser.from_esri_code(54030)
#crs = pycrs.parser.from_sr_code(7898)
#crs = pycrs.parser.from_epsg_code(4324)
#crs = pycrs.parser.from_sr_code(6618)
crs = pycrs.parser.from_proj4(proj4)
#crs = pycrs.parser.from_ogc_wkt(wkt)

print crs.to_proj4()

render_world(crs)




###########################
# PRJ FILE
crs = pycrs.loader.from_file("testfiles/natearth.prj")
print crs