from octopart import enum
import octopart

def part_search(q, start = 0, limit = False, fields={}, include=[]):
    p = {'q': q, 'start': 0}
    if limit:
      p['limit'] = limit

    for field, data in fields.iteritems():
      if data is not None and data['q']:
        p['filter[fields][' + field + '][]'] = data['q']
#        key = 'filter[fields][' + field + '][]'
#        if not key in p:
#          p[key] = arr = []
#        else:
#          arr = p[key]
#        arr.append(data['q'])
      pass

    if len(include) > 0:
      p['include[]'] = include


#    p['spec_drilldown[include]'] = 'true'

    json = octopart.get('/parts/search', p)
    return octopart.SearchResponse(json)

PackageType = enum('through_hole', 'smd')

class ResistorSearch():
    def __init__(self):
        self.params = {}
        self.fields = ['package_type', 'case', 'resistance', 'tolerance', 'seller']

    def has_key(self, key):
      try:
          self.fields.index(key)
      except ValueError:
          raise Exception('Invalid key for search: ' + key)

    def __setitem__(self, key, item):
        self.has_key(key)
        self.params[key] = item

    def __getitem__(self, key):
        self.has_key(key)
        return self.params[key]

#    lifecycle_status
# specs.resistance_tolerance.value
def resistor_search(search):
    q = ''

    categories = octopart.category_search('Resistors')
    categories = filter(lambda c: c.name == 'Resistors', categories)
    if len(categories) == 0:
        raise Exception("Could not find category for resistors")
    category = categories[0]

    fields = {}
#        'specs.case_package.value': {'q': '1206'},
    fields['category_uids'] = {'q': category.uid}
    fields['specs.resistance.value'] = {'q': search['resistance']}

    # case_package is broken (always returns 0 hits), but it is usually in the description
    if search['case'] is not None:
      q += ' ' + search['case']

#    if package_type == PackageType.smd:
#        fields['specs.case_package.value'] = {'q': '1210'}

    seller = search['seller']
    if seller is not None:
        sellers = octopart.seller_search(search['seller'])
        if len(sellers) == 0:
            raise Exception('Could not find seller: ' + seller)
        fields['offers.seller.name'] = {'q': sellers[0].name}

    res = octopart.part_search(q, limit=100, fields=fields)
    return res