__author__  = "MetaCarta"
__copyright__ = "Copyright (c) 2006-2008 MetaCarta"
__license__ = "Clear BSD" 
__version__ = "$Id$"

import sys

class Feature (object):
    def __init__ (self, id = None, geometry = None, props = None):
        self.id         = id
        self.geometry   = geometry or {}
        self.properties = props or {}
        self.bbox       = None

    def get_bbox (self):
        minx = miny = sys.maxint
        maxx = maxy = -1 * sys.maxint
        try:
            coords = self.geometry["coordinates"]
            if self.geometry["type"] in ("Point", "Line"):
                for coord in coords:
                    if coord[0] < minx: minx = coord[0]
                    if coord[0] > maxx: maxx = coord[0]
                    if coord[1] < miny: miny = coord[1]
                    if coord[1] > maxy: maxy = coord[1]
            else:
                for ring in coords:
                    for coord in ring:
                        if coord[0] < minx: minx = coord[0]
                        if coord[0] > maxx: maxx = coord[0]
                        if coord[1] < miny: miny = coord[1]
                        if coord[1] > maxy: maxy = coord[1]
            return (minx, miny, maxx, maxy)
        except:
            raise Exception("Unable to determine bounding box for feature with geometry %s" % self.geometry)

    def to_dict (self):
        return {"id": self.id,
                "geometry": self.geometry,
                "properties": self.properties}