import unittest,warnings
import sys,os,glob
sys.path.append(os.path.join(sys.path[0],".."))
import globals
from globals import OPTS
import debug

class openram_test(unittest.TestCase):
    """ Base unit test that we have some shared classes in. """
    
    def local_drc_check(self, w):
        tempgds = OPTS.openram_temp + "temp.gds"
        w.gds_write(tempgds)
        import verify
        self.assertFalse(verify.run_drc(w.name, tempgds))

        files = glob.glob(OPTS.openram_temp + '*')
        for f in files:
            os.remove(f)        
    
    def local_check(self, a, final_verification=False):

        tempspice = OPTS.openram_temp + "temp.sp"
        tempgds = OPTS.openram_temp + "temp.gds"

        a.sp_write(tempspice)
        a.gds_write(tempgds)

        import verify
        try:
            self.assertTrue(verify.run_drc(a.name, tempgds)==0)
        except:
            self.reset()
            self.fail("DRC failed: {}".format(a.name))

            
        try:
            self.assertTrue(verify.run_lvs(a.name, tempgds, tempspice, final_verification)==0)
        except:
            self.reset()
            self.fail("LVS mismatch: {}".format(a.name))

        self.reset()
        if OPTS.purge_temp:
            self.cleanup()

    def cleanup(self):
        """ Reset the duplicate checker and cleanup files. """
        files = glob.glob(OPTS.openram_temp + '*')
        for f in files:
            # Only remove the files
            if os.path.isfile(f):
                os.remove(f)        

    def reset(self):
        """ Reset the static duplicate name checker for unit tests """
        import design
        design.design.name_map=[]

    def isclose(self, value1,value2,error_tolerance=1e-2):
        """ This is used to compare relative values. """
        import debug
        relative_diff = abs(value1 - value2) / max(value1,value2)
        check = relative_diff <= error_tolerance
        if not check:
            self.fail("NOT CLOSE {0} {1} relative diff={2}".format(value1,value2,relative_diff))
        else:
            debug.info(2,"CLOSE {0} {1} relative diff={2}".format(value1,value2,relative_diff))

    def relative_compare(self, value1,value2,error_tolerance):
        """ This is used to compare relative values. """
        if (value1==value2): # if we don't need a relative comparison!
            return True
        return (abs(value1 - value2) / max(value1,value2) <= error_tolerance)

    def isapproxdiff(self, f1, f2, error_tolerance=0.001):
        """Compare two files.

        Arguments:
        
        f1 -- First file name
        
        f2 -- Second file name

        Return value:
        
        True if the files are the same, False otherwise.
        
        """
        import re
        import debug

        with open(f1, 'rb') as fp1, open(f2, 'rb') as fp2:
            while True:
                b1 = fp1.readline()
                b2 = fp2.readline()
                #print "b1:",b1,
                #print "b2:",b2,

                # 1. Find all of the floats using a regex
                numeric_const_pattern = r"""
                [-+]? # optional sign
                (?:
                (?: \d* \. \d+ ) # .1 .12 .123 etc 9.1 etc 98.1 etc
                |
                (?: \d+ \.? ) # 1. 12. 123. etc 1 12 123 etc
                )
                # followed by optional exponent part if desired
                (?: [Ee] [+-]? \d+ ) ?
                """
                rx = re.compile(numeric_const_pattern, re.VERBOSE)
                b1_floats=rx.findall(b1)
                b2_floats=rx.findall(b2)
                debug.info(3,"b1_floats: "+str(b1_floats))
                debug.info(3,"b2_floats: "+str(b2_floats))
        
                # 2. Remove the floats from the string
                for f in b1_floats:
                    b1=b1.replace(str(f),"",1)
                for f in b2_floats:
                    b2=b2.replace(str(f),"",1)
                #print "b1:",b1,
                #print "b2:",b2,
            
                # 3. Check if remaining string matches
                if b1 != b2:
                    self.fail("MISMATCH Line: {0}\n!=\nLine: {1}".format(b1,b2))

                # 4. Now compare that the floats match
                if len(b1_floats)!=len(b2_floats):
                    self.fail("MISMATCH Length {0} != {1}".format(len(b1_floats),len(b2_floats)))
                for (f1,f2) in zip(b1_floats,b2_floats):
                    if not self.relative_compare(float(f1),float(f2),error_tolerance):
                        self.fail("MISMATCH Float {0} != {1}".format(f1,f2))

                if not b1 and not b2:
                    return



    def isdiff(self,file1,file2):
        """ This is used to compare two files and display the diff if they are different.. """
        import debug
        import filecmp
        import difflib
        check = filecmp.cmp(file1,file2)
        if not check:
            debug.info(2,"MISMATCH {0} {1}".format(file1,file2))
            f1 = open(file1,"r")
            s1 = f1.readlines()
            f2 = open(file2,"r")
            s2 = f2.readlines()
            for line in difflib.unified_diff(s1, s2):
                debug.info(3,line)
            self.fail("MISMATCH {0} {1}".format(file1,file2))
        else:
            debug.info(2,"MATCH {0} {1}".format(file1,file2))


def header(filename, technology):
    tst = "Running Test for:"
    print "\n"
    print " ______________________________________________________________________________ "
    print "|==============================================================================|"
    print "|=========" + tst.center(60) + "=========|"
    print "|=========" + technology.center(60) + "=========|"
    print "|=========" + filename.center(60) + "=========|"
    from  globals import OPTS
    print "|=========" + OPTS.openram_temp.center(60) + "=========|"
    print "|==============================================================================|"