import os

import numpy as np
import numpy.ma as ma
from pylru import lrudecorator
import rasterio

from ..rasterset import Raster
from ..simpleexpr import SimpleExpr
from .. import utils

REFERENCE_YEAR = 2000

class Hyde(object):
  def __init__(self, year):
    self._year = year
    return

  @property
  def year(self):
    return self._year

  @property
  def syms(self):
    return ['grumps', 'hpd_ref', 'hpd_proj']

  def eval(self, df):
    div = ma.where(df['hpd_ref'] == 0, 1, df['hpd_ref'])
    return ma.where(df['hpd_ref'] == 0,
                    df['hpd_proj'],
                    df['grumps'] * df['hpd_proj'] / div)

@lrudecorator(10)
def years():
  with rasterio.open('netcdf:%s/luh2/hyde.nc:popd' % utils.outdir()) as ds:
    return tuple(map(lambda idx: int(ds.tags(idx)['NETCDF_DIM_time']),
                     ds.indexes))

def raster(version, year):
  if year not in years(version):
    raise RuntimeError('year (%d) not present in HYDE dataset)' % year)
  return {'hpd':
          Raster('hpd', 'netcdf:%s/luh2/hyde.nc:popd' % utils.outdir(),
                 band=years().index(year))}

def scale_grumps(year):
  rasters = {}
  if year not in years():
    raise RuntimeError('year %d not available in HYDE projection' % year)
  ref_band = years().index(REFERENCE_YEAR)
  year_band = years().index(year)
  rasters['grumps'] = Raster('grumps', '%s/luh2/gluds00ag.tif' % utils.outdir())
  rasters['hpd_ref'] = Raster('hpd_ref',
                              'netcdf:%s/luh2/hyde.nc:popd' % utils.outdir(),
                              band=ref_band + 1)
  rasters['hpd_proj'] = Raster('hpd_proj',
                               'netcdf:%s/luh2/hyde.nc:popd' % utils.outdir(),
                               band=year_band + 1)
  rasters['hpd'] = Hyde(year)
  return rasters

@@ -128,44 +128,8 @@
 ter%0A
-from ..simpleexpr import SimpleExpr%0A
 from

Remove simpleexpr from the import list