from re import sub
import gzip
try:
    from StringIO import StringIO
except ImportError:
    from io import StringIO
import uu
import re
import types
from .PyPolyBoRi import *
AUTO = "auto"
SINGLE = "single"


#def ref_file_name(f):
#    name=re.sub("data/","",f)
#    name=sub(r"\.py","",name)
#    l=name.split("/")[:-1]
def reencode_blocks(block_str):
    return str(block_str).replace(",", "_")


def parse_blocks(block_str, data):
    if block_str == AUTO:
        #print "block starts:",data.block_start_hints
        return data.block_start_hints
    if block_str == SINGLE:
        return []
    return [int(i) for i in block_str.split(",")]


def load_ref_raw(s):
    s = sub("data/", "", s)
    s = sub(r"data\.", "", s)
    s = sub(r"\.py", "", s)
    s = sub(r"\.", "/", s)

    ref_file = "ref/" + s + ".ref"
     #print "loading:", ref_file
    res_f = open(ref_file)
    res = res_f.read()
    res_f.close()
    return res


def load_ref(s, ordering="lp", blocks=SINGLE):
    return load_ref_gz_uu(s, ordering, blocks)


def ordering_suffix(o, blocks=None):
    if o == "lp":
        return ""
    else:
        if re.match("block", o):
            return "." + o + "_" + reencode_blocks(blocks)
        else:
            return "." + o


def number_of_declared_vars(data):
    try:
        return data.number_of_declared_vars
    except:
        return data.r.ngens()


def load_ref_gz_uu(s, o, b):
    s = sub("data/", "", s)
    s = sub(r"data\.", "", s)
    s = sub(r"\.py", "", s)
    s = sub(r"\.", "/", s)

    ref_file = "ref/" + s + ordering_suffix(o, b) + ".ref.gz.uu"
    #print "loading:", ref_file
    res = StringIO()
    uu.decode(ref_file, res)
    res = res.getvalue()
    res = StringIO(res)
    res = gzip.GzipFile(fileobj=res, mode="r").read()
    res = res.replace(" ", "")
    #res_f=open(ref_file)
    #res=res_f.read()
    #res_f.close()
    #print "returning"
    return res

#def load_ref(s):
#    return load_ref_raw(s)

def convert_refs(ref_file_orig):
    content = open(ref_file_orig).read()
    #buf=StringIO(content)
    buf_out = StringIO()
    #
    zipped = gzip.GzipFile(filename=ref_file_orig, mode="w", fileobj=buf_out)
    zipped.write(content)
    zipped.close()
    val = buf_out.getvalue()
    out = open(ref_file_orig + ".gz.uu", "w")
    #print val
    uu.encode(out_file=out, in_file=StringIO(val))
    out.close()


def my_import(name, globals=None, locals=None):
    if globals is None:
        globals = {}
    if locals is None:
        locals = {}
    #print name
    #print locals, globals
    mod = __import__(name)
    #print dir(mod)
    components = name.split('.')
    for comp in components[1:]:
        mod = getattr(mod, comp)
    return mod


def dyn_generate(content, name):
    module = types.ModuleType(name)
    import_header = """from .PyPolyBoRi import Variable,Monomial, Polynomial, Ring, OrderCode
from itertools import chain
from .blocks import AlternatingBlock,Block,AdderBlock,if_then,HigherOrderBlock,declare_ring as orig_declare_ring,declare_block_scheme,MacroBlock\n
def declare_ring(blocks, context=None):
  if context is None:
    context=globals()
  return orig_declare_ring(blocks,context)
"""
    exec(import_header + content, module.__dict__)
    if hasattr(module, "ideal"):
        module.ideal = [Polynomial(p) for p in module.ideal]
    return module


def clean_data(data):
    r = data.r
    for a in dir(data):
        if a != "r":
            delattr(data, a)


    #del data.r
    #del r
def load_data(file_name, base_dir="./"):
    in_file = file_name
    #in_file=sub(r"\.py$","",in_file)
    #in_file=sub(r"/",".", in_file)
    #if not re.match("^data",in_file):
    #    in_file="data."+in_file
    #def x(i):
    #    return Monomial(Variable(i))
    if not re.match("^data", in_file):
        in_file = "data/" + in_file
    in_file = sub(r".py$", "", in_file)
    module_name = sub("/", r"\.", in_file)
    in_file = sub(r"\.", "/", in_file)
    in_file = in_file + ".py"
    #print in_file
    in_file = open(base_dir + in_file).read()

    #print in_file
    #return my_import(in_file)
    return dyn_generate(in_file, "pb_data")


def load_file(file_name):

    in_file = file_name

    in_file = open(in_file).read()

    return dyn_generate(in_file, "pb_data")
