#!/usr/bin/env python
from __future__ import print_function
import os, itertools, urllib

def get_ch_answer(query):
	return urllib.urlopen('http://127.0.0.1:8123', data=query).read()

def check_answers(query, answer):
	ch_answer = get_ch_answer(query)
	if ch_answer.strip() != answer.strip():
		print("FAIL on query:", query)
		print("Expected answer:", answer)
		print("Fetched answer :", ch_answer)
		exit(-1)

def get_values():
	values = [0, 1, -1]
	for bits in [8, 16, 32, 64]:
		values += [2**bits, 2**bits - 1]
		values += [2**(bits-1) - 1, 2**(bits-1), 2**(bits-1) + 1]
		values += [-2**(bits-1) - 1, -2**(bits-1), -2**(bits-1) + 1]
	return values

def is_valid_integer(x):
	return -2**63 <= x and x <= 2**64-1


TEST_WITH_CASTING=True
GENERATE_TEST_FILES=False

TYPES = {
	"UInt8"	: { "bits" : 8, "sign" : False, "float" : False },
	"Int8" 	: { "bits" : 8, "sign" : True, "float" : False },

	"UInt16": { "bits" : 16, "sign" : False, "float" : False },
	"Int16" : { "bits" : 16, "sign" : True, "float" : False },

	"UInt32": { "bits" : 32, "sign" : False, "float" : False },
	"Int32" : { "bits" : 32, "sign" : True, "float" : False },

	"UInt64": { "bits" : 64, "sign" : False, "float" : False },
	"Int64" : { "bits" : 64, "sign" : True, "float" : False }

	#"Float32" : { "bits" : 32, "sign" : True, "float" : True },
	#"Float64" : { "bits" : 64, "sign" : True, "float" : True }
}


def inside_range(value, type_name):
	bits = TYPES[type_name]["bits"]
	signed = TYPES[type_name]["sign"]
	is_float = TYPES[type_name]["float"]

	if is_float:
		return True

	if signed:
		return -2**(bits-1) <= value and value <= 2**(bits-1) - 1
	else:
		return 0 <= value and value <= 2**bits - 1


def test_operators(v1, v2, v1_passed, v2_passed):
	query_str = "{v1} = {v2}, {v1} != {v2}, {v1} < {v2}, {v1} <= {v2}, {v1} > {v2}, {v1} >= {v2},\t".format(v1=v1_passed, v2=v2_passed)
	query_str += "{v1} = {v2}, {v1} != {v2}, {v1} < {v2}, {v1} <= {v2}, {v1} > {v2}, {v1} >= {v2} ".format(v1=v2_passed, v2=v1_passed)

	answers = [v1 == v2, v1 != v2, v1 < v2, v1 <= v2, v1 > v2, v1 >= v2]
	answers += [v2 == v1, v2 != v1, v2 < v1, v2 <= v1, v2 > v1, v2 >= v1]

	answers_str = "\t".join([str(int(x)) for x in answers])

	return (query_str, answers_str)


VALUES = [x for x in get_values() if is_valid_integer(x)]

def test_pair(v1, v2):
	query = "SELECT {}, {}, ".format(v1, v2)
	answers = "{}\t{}\t".format(v1, v2)

	q, a = test_operators(v1, v2, str(v1), str(v2))
	query += q
	answers += a

	if TEST_WITH_CASTING:
		for t1 in TYPES.iterkeys():
			if inside_range(v1, t1):
				for t2 in TYPES.iterkeys():
					if inside_range(v2, t2):
						q, a = test_operators(v1, v2, 'to{}({})'.format(t1, v1), 'to{}({})'.format(t2, v2))
						query += ', ' + q
						answers += "\t" + a

	check_answers(query, answers)
	return query, answers


VALUES_INT = [0, -1, 1, 2**64-1, 2**63, -2**63, 2**63-1, 2**51, 2**52, 2**53-1, 2**53, 2**53+1, 2**53+2, -2**53+1, -2**53, -2**53-1, -2**53-2, 2*52, -2**52]
VALUES_FLOAT = [float(x) for x in VALUES_INT + [-0.5, 0.5, -1.5, 1.5, 2**53, 2**51 - 0.5, 2**51 + 0.5, 2**60, -2**60, -2**63 - 10000, 2**63 + 10000]]

def test_float_pair(i, f):
	f_str = ("%.9f" % f)
	query = "SELECT '{}', '{}', ".format(i, f_str)
	answers = "{}\t{}\t".format(i, f_str)

	q, a = test_operators(i, f, i, f_str)
	query += q
	answers += a

	if TEST_WITH_CASTING:
		for t1 in TYPES.iterkeys():
			if inside_range(i, t1):
				q, a = test_operators(i, f, 'to{}({})'.format(t1, i), f_str)
				query += ', ' + q
				answers += "\t" + a

	check_answers(query, answers)
	return query, answers


def main():
	if GENERATE_TEST_FILES:
		base_name = '00411_accurate_number_comparison'
		sql_file = open(base_name + '.sql', 'wt')
		ref_file = open(base_name + '.reference', 'wt')

	for (v1, v2) in itertools.combinations(VALUES, 2):
		q, a = test_pair(v1, v2)
		if GENERATE_TEST_FILES:
			sql_file.write(q + ";\n")
			ref_file.write(a + "\n")

	for (i, f) in itertools.product(VALUES_INT, VALUES_FLOAT):
		q, a = test_float_pair(i, f)
		if GENERATE_TEST_FILES:
			sql_file.write(q + ";\n")
			ref_file.write(a + "\n")

	print("PASSED")


if __name__ == "__main__":
	main()