#!/usr/bin/python

import unittest
import math

#import logging
#logging.basicConfig(level = logging.DEBUG)

from gi.repository import Vips 
from vips8 import vips

unsigned_formats = [Vips.BandFormat.UCHAR, 
                    Vips.BandFormat.USHORT, 
                    Vips.BandFormat.UINT] 
signed_formats = [Vips.BandFormat.CHAR, 
                  Vips.BandFormat.SHORT, 
                  Vips.BandFormat.INT] 
float_formats = [Vips.BandFormat.FLOAT, 
                 Vips.BandFormat.DOUBLE]
complex_formats = [Vips.BandFormat.COMPLEX, 
                   Vips.BandFormat.DPCOMPLEX] 
int_formats = unsigned_formats + signed_formats
noncomplex_formats = int_formats + float_formats
all_formats = int_formats + float_formats + complex_formats

# an expanding zip ... if either of the args is not a list, duplicate it down
# the other
def zip_expand(x, y):
    if isinstance(x, list) and isinstance(y, list):
        return zip(x, y)
    elif isinstance(x, list):
        return [[i, y] for i in x]
    elif isinstance(y, list):
        return [[x, j] for j in y]
    else:
        return [[x, y]]

class TestConversion(unittest.TestCase):
    # test a pair of things which can be lists for approx. equality
    def assertAlmostEqualObjects(self, a, b, places = 4, msg = ''):
        #print 'assertAlmostEqualObjects %s = %s' % (a, b)
        for x, y in zip_expand(a, b):
            self.assertAlmostEqual(x, y, places = places, msg = msg)

    # run a function on an image and on a single pixel, the results 
    # should match 
    def run_cmp(self, message, im, x, y, fn):
        a = im.getpoint(x, y)
        v1 = fn(a)
        im2 = fn(im)
        v2 = im2.getpoint(x, y)
        self.assertAlmostEqualObjects(v1, v2, msg = message)

    # run a function on a pair of images and on a pair of pixels, the results 
    # should match 
    def run_cmp2(self, message, left, right, x, y, fn):
        a = left.getpoint(x, y)
        b = right.getpoint(x, y)
        v1 = fn(a, b)
        after = fn(left, right)
        v2 = after.getpoint(x, y)
        self.assertAlmostEqualObjects(v1, v2, msg = message)

    # run a function on a pair of images
    # 50,50 and 10,10 should have different values on the test image
    def run_test2(self, message, left, right, fn):
        self.run_cmp2(message, left, right, 50, 50, fn)
        self.run_cmp2(message, left, right, 10, 10, fn)

    # run a function on an image, 
    # 50,50 and 10,10 should have different values on the test image
    def run_testunary(self, message, im, fn):
        self.run_cmp(message, im, 50, 50, fn)
        self.run_cmp(message, im, 10, 10, fn)

    def run_unary(self, images, fn, fmt = all_formats):
        [self.run_testunary(fn.func_name + ' image', x.cast(y), fn)
         for x in images for y in fmt]

    def setUp(self):
        im = Vips.Image.mask_ideal(100, 100, 0.5, reject = True, optical = True)
        self.colour = im * [1, 2, 3] + [2, 3, 4]
        self.mono = self.colour.extract_band(1)
        self.all_images = [self.mono, self.colour]

    def test_band_and(self):
        def band_and(x):
            if isinstance(x, Vips.Image):
                return x.bandbool(Vips.OperationBoolean.AND)
            else:
                return [reduce(lambda a, b: int(a) & int(b), x)]

        self.run_unary([self.colour], band_and, fmt = int_formats)

    def test_band_or(self):
        def band_or(x):
            if isinstance(x, Vips.Image):
                return x.bandbool(Vips.OperationBoolean.OR)
            else:
                return [reduce(lambda a, b: int(a) | int(b), x)]

        self.run_unary([self.colour], band_or, fmt = int_formats)

    def test_band_eor(self):
        def band_eor(x):
            if isinstance(x, Vips.Image):
                return x.bandbool(Vips.OperationBoolean.EOR)
            else:
                return [reduce(lambda a, b: int(a) ^ int(b), x)]

        self.run_unary([self.colour], band_eor, fmt = int_formats)

if __name__ == '__main__':
    unittest.main()