#!/usr/bin/env python
from string import *

import commands
import getopt
import os
import sys


def Usage(mesg):
    print mesg + os.linesep

    print "Usage: " + os.linesep

    print "Mode 1. Compare output of 'lame1' and 'lame2':"
    print "./lametest.py  [options] options_file  input.wav lame1 lame2" + os.linesep

    print "Mode 2. Compare output of lame1 with reference solutions:"
    print "./lametest.py [options] options_file input.wav lame1" + os.linesep

    print "Mode 3. Generate reference solutions using lame1:"
    print "./lametest.py -m options_file input.wav lame1" + os.linesep

    print "options: "
    print "   -w   convert mp3's to wav's before comparison"

    sys.exit(0)


#
# compare two files, return # bytes which differ and the
# number of bytes in larger file
#
def fdiff(name1, name2):
    cmd = "cmp -l " + name1 + " " + name2 + " | wc -l"
    # XXX either
    #    use a combination of os.popen + read
    # or
    #    write owen cmp+wc function
    # to replace commands.getoutput
    out = commands.getoutput(cmd)
    out = split(out, "\n")
    out = out[-1]
    if find(out, "No") == -1:
        diff = atof(out)

        status = os.access(name1, os.R_OK)
        if 1 != status:
            size1 = 0
        else:
            size1 = os.path.getsize(name1)
        size2 = os.path.getsize(name2)
        diff = diff + abs(size1 - size2)
        size = max(size1, size2)
    else:
        diff = -1
        size = 0
    return (diff, size)

#
# compare two files, return # bytes which differ and the
# number of bytes in larger file
#


def compare(name1, name2, decode):
    if decode:
        print "converting mp3 to wav for comparison..."
        # XXX shouldn't we use lame1 instead of a hardcoded lame?
        os.system("lame --quiet --mp3input --decode " + name1)
        os.system("lame --quiet --mp3input --decode " + name2)
        name1 = name1 + ".wav"
        name2 = name2 + ".wav"

    rcode = 0
    diff, size = fdiff(name1, name2)
    if diff == 0:
        print "output identical:  diff=%i  total=%i" % (diff, size)
        rcode = 1
    elif diff > 0:
        print "output different: diff=%i  total=%i  %2.0f%%" % \
            (diff, size, 100 * float(diff) / size)
    else:
        print "Error comparing files:"
        print "File 1: " + name1
        print "File 2: " + name2

    return rcode


#
# main program
#
try:
    optlist, args = getopt.getopt(sys.argv[1:], 'wm')
except getopt.error, val:
    Usage('ERROR: ' + val)

decode = 0
lame2 = "none"
for opt in optlist:
    if opt[0] == '-w':
        decode = 1
    elif opt[0] == '-m':
        lame2 = "makeref"
        print os.linesep + "Generating reference output"


if len(args) < 3:
    Usage("Not enough arguments.")
if len(args) > 4:
    Usage("Too many arguments.")

if lame2 == "makeref":
    if len(args) != 3:
        Usage("Too many arguments for -r/-m mode.")
else:
    if len(args) == 3:
        lame2 = "ref"

# populate variables from args and normalize & expand path
if len(args) >= 3:
    options_file = os.path.normpath(os.path.expanduser(args[0]))
    input_file = os.path.normpath(os.path.expanduser(args[1]))
    lame1 = os.path.normpath(os.path.expanduser(args[2]))
if len(args) >= 4:
    lame2 = os.path.normpath(os.path.expanduser(args[3]))

# check readability of options_file
status = os.access(options_file, os.R_OK)
if status != 1:
    Usage(options_file + " not readable")

# check readability of input_file
status = os.access(input_file, os.R_OK)
if status != 1:
    Usage(input_file + " not readable")


# generate searchlist of directories
path = split(os.environ['PATH'], os.pathsep)
path.append(os.curdir)

# init indicator vars
lame1_ok = 0
lame2_ok = 0

# check for executable lame1
for x in path:
    status = os.access(os.path.join(x, lame1), os.X_OK)
    if status == 1:
        lame1_ok = 1
        break
if lame1_ok != 1:
    Usage(lame1 + " is not executable")

if not (lame2 == "ref" or lame2 == "makeref"):
    # check for executable lame2
    for x in path:
        status = os.access(os.path.join(x, lame2), os.X_OK)
        if status == 1:
            lame2_ok = 1
            break
    if lame2_ok != 1:
        Usage(lame2 + " is not executable")


tmp = split(options_file, os.sep)
tmp = tmp[-1]
basename = replace(input_file, ".wav", "")
basename = basename + "." + tmp


num_ok = 0
n = 0
foptions = open(options_file)
line = rstrip(foptions.readline())
while line:
    n = n + 1
    name1 = basename + "." + str(n) + ".mp3"
    name2 = basename + "." + str(n) + "ref.mp3"

    print      # empty line

    if lame2 == 'ref':
        cmd = "rm -f " + name1
        os.system(cmd)
        cmd = lame1 + " --quiet " + line + " " + input_file + " " + name1
        print "executable:      ", lame1
        print "options:         ", line
        print "input:           ", input_file
        print "reference output:", name2
        print cmd
        os.system(cmd)
        num_ok = num_ok + compare(name1, name2, decode)
    elif lame2 == 'makeref':
        cmd = "rm -f " + name2
        os.system(cmd)
        print "executable: ", lame1
        print "options:    ", line
        print "input:      ", input_file
        print "output:     ", name2
        cmd = lame1 + " --quiet " + line + " " + input_file + " " + name2
        os.system(cmd)
    else:
        cmd = "rm -f " + name1
        os.system(cmd)
        cmd = "rm -f " + name2
        os.system(cmd)
        print "executable:  ", lame1
        print "executable2: ", lame2
        print "options:     ", line
        print "input:       ", input_file
        cmd1 = lame1 + " --quiet " + line + " " + input_file + " " + name1
        cmd2 = lame2 + " --quiet " + line + " " + input_file + " " + name2
        os.system(cmd1)
        os.system(cmd2)
        num_ok = num_ok + compare(name1, name2, decode)

    line = rstrip(foptions.readline())

foptions.close()

if lame2 != 'makeref':
    print os.linesep + "Number of tests which passed: ", num_ok
    print "Number of tests which failed: ", n - num_ok