"""
Expand zipped sponge data files.

Usage:

   > python expand.py path/to/config/file

>>> import expand
"""

__author__ = "Chris Calloway"
__email__ = "cbc@chriscalloway.org"
__copyright__ = "Copyright 2010 UNC-CH Department of Marine Science"
__license__ = "GPL2"

import sys
import os
import glob
import zipfile
import shutil
import fileinput
from StringIO import StringIO

usage = "\n".join(__doc__.splitlines()[3:6])
test_path = "tests/expand"


def config_path():
    """
    Return the configuration file path from the command line.

    Supply too few arguments on command line.

    >>> save_stdout = sys.stdout
    >>> temp_stdout = StringIO()
    >>> sys.stdout = temp_stdout
    >>> sys.argv = []
    >>> _config_path = config_path()
    >>> sys.stdout = save_stdout
    >>> usage == temp_stdout.getvalue()[:-1]
    True

    Supply too many arguments on the command line.

    >>> save_stdout = sys.stdout
    >>> temp_stdout = StringIO()
    >>> sys.stdout = temp_stdout
    >>> sys.argv = ["", "", "",]
    >>> _config_path = config_path()
    >>> sys.stdout = save_stdout
    >>> usage == temp_stdout.getvalue()[:-1]
    True

    Supply non-file argument.

    >>> save_stdout = sys.stdout
    >>> temp_stdout = StringIO()
    >>> sys.stdout = temp_stdout
    >>> _config_path = os.path.join(
    ...                    os.path.dirname(
    ...                        os.path.abspath(__file__)),
    ...                    test_path)
    >>> sys.argv = ["", _config_path]
    >>> _config_path = config_path()
    >>> sys.stdout = save_stdout
    >>> usage == temp_stdout.getvalue()[:-1]
    True

    Supply nonexistent file argument.

    >>> save_stdout = sys.stdout
    >>> temp_stdout = StringIO()
    >>> sys.stdout = temp_stdout
    >>> _config_path = os.path.join(
    ...                    os.path.dirname(
    ...                        os.path.abspath(__file__)),
    ...                    test_path, "xxxxx")
    >>> sys.argv = ["", _config_path]
    >>> _config_path = config_path()
    >>> sys.stdout = save_stdout
    >>> usage == temp_stdout.getvalue()[:-1]
    True

    Supply valid config path argument.

    >>> _config_path = os.path.join(
    ...                    os.path.dirname(
    ...                        os.path.abspath(__file__)),
    ...                    test_path, "config.py")
    >>> sys.argv = ["", _config_path]
    >>> _config_path == config_path()
    True
    """

    path = None
    try:
        if len(sys.argv) == 2:
            path = sys.argv[1]
            if not os.path.exists(path):
                raise IOError(path + \
                              " does not exist.")
            elif not os.path.isfile(path):
                raise IOError(path + \
                              " is not a file.")
        else:
            raise IOError("Incorrect number of arguments supplied.")
    except IOError:
        print usage
    return path


def config(path):
    """
    Return the configuration from a file.

    Execute empty configuration.

    >>> _config_path = os.path.join(
    ...                    os.path.dirname(
    ...                        os.path.abspath(__file__)),
    ...                    test_path, "empty_config.py")
    >>> zipdir,xmldir,zipdir_pattern,zipfile_pattern,xmlfile_pattern = \
            config(_config_path)
    >>> zipdir
    >>> xmldir
    >>> zipdir_pattern
    >>> zipfile_pattern
    >>> xmlfile_pattern

    Execute nonexistent configuration.

    >>> save_stdout = sys.stdout
    >>> temp_stdout = StringIO()
    >>> sys.stdout = temp_stdout
    >>> _config_path = os.path.join(
    ...                    os.path.dirname(
    ...                        os.path.abspath(__file__)),
    ...                    test_path, "xxxxx")
    >>> zipdir,xmldir,zipdir_pattern,zipfile_pattern,xmlfile_pattern = \
            config(_config_path)
    >>> sys.stdout = save_stdout
    >>> usage == temp_stdout.getvalue()[:-1]
    True
    >>> zipdir
    >>> xmldir
    >>> zipdir_pattern
    >>> zipfile_pattern
    >>> xmlfile_pattern

    Execute bad configuration.

    >>> save_stdout = sys.stdout
    >>> temp_stdout = StringIO()
    >>> sys.stdout = temp_stdout
    >>> _config_path = os.path.join(
    ...                    os.path.dirname(
    ...                        os.path.abspath(__file__)),
    ...                    test_path, "bad_config.py")
    >>> zipdir,xmldir,zipdir_pattern,zipfile_pattern,xmlfile_pattern = \
            config(_config_path)
    >>> sys.stdout = save_stdout
    >>> usage == temp_stdout.getvalue()[:-1]
    True
    >>>
    >>> zipdir
    >>> xmldir
    >>> zipdir_pattern
    >>> zipfile_pattern
    >>> xmlfile_pattern

    Execute valid configuration.

    >>> _config_path = os.path.join(
    ...                    os.path.dirname(
    ...                        os.path.abspath(__file__)),
    ...                    test_path, "config.py")
    >>> zipdir,xmldir,zipdir_pattern,zipfile_pattern,xmlfile_pattern = \
            config(_config_path)
    >>> zipdir == os.path.join(os.path.dirname(os.path.abspath(__file__)),
    ...                        test_path, "zip")
    True
    >>> xmldir == os.path.join(os.path.dirname(os.path.abspath(__file__)),
    ...                        test_path, "xml")
    True
    >>> zipdir_pattern == "[0-9][0-9][0-9][0-9]_[0-9][0-9]"
    True
    >>> zipfile_pattern == "[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]T" \
                           "[0-9][0-9][0-9][0-9][0-9][0-9]-" \
                           "[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]T" \
                           "[0-9][0-9][0-9][0-9][0-9][0-9].zip"
    True
    >>> xmlfile_pattern == "[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]T" \
                           "[0-9][0-9][0-9][0-9][0-9][0-9].xml"
    True
    """

    namespace = {}
    namespace["zipdir"] = None
    namespace["xmldir"] = None
    namespace["zipdir_pattern"] = None
    namespace["zipfile_pattern"] = None
    namespace["xmlfile_pattern"] = None
    try:
        execfile(path, globals(), namespace)
    except IOError:
        print usage
    except SyntaxError:
        print usage
    return (namespace["zipdir"],
            namespace["xmldir"],
            namespace["zipdir_pattern"],
            namespace["zipfile_pattern"],
            namespace["xmlfile_pattern"],)


def combine(xml_subdir, xmlfile_pattern):
    """
    Combine the xml sponge data files from a subdirectory.

    Combine test subdirectory.

    >>> xmlref_path = os.path.join(
    ...                   os.path.dirname(
    ...                       os.path.abspath(__file__)),
    ...                   test_path, "xmlref")
    >>> xmlref = glob.glob(os.path.join(xmlref_path, "*"))
    >>> xmlref_path = [path for path in xmlref if os.path.isdir(path)][0]
    >>> xmltest_path = os.path.join(
    ...                    os.path.dirname(
    ...                        os.path.abspath(__file__)),
    ...                    test_path, "xmltest")
    >>> if os.path.exists(xmltest_path):
    ...     shutil.rmtree(xmltest_path)
    >>> shutil.copytree(xmlref_path, xmltest_path)
    >>> xmltest = glob.glob(os.path.join(xmltest_path, "*"))
    >>> xml_subdir = [path for path in xmltest if os.path.isdir(path)][0]
    >>> xmlfile_pattern = "[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]T" \
                          "[0-9][0-9][0-9][0-9][0-9][0-9].xml"
    >>> combine(xml_subdir, xmlfile_pattern)
    >>> ref_path = xml_subdir + os.extsep + "ref"
    >>> xml_path = xml_subdir + os.extsep + "xml"
    >>> ref_handle = open(ref_path)
    >>> xml_handle = open(xml_path)
    >>> reffile = ref_handle.read()
    >>> xmlfile = xml_handle.read()
    >>> reffile == xmlfile
    True
    >>> ref_handle.close()
    >>> xml_handle.close()
    >>> os.path.exists(xml_subdir)
    False
    """

    # Find all the xml sponge data files.
    xmlfiles = glob.glob(os.path.join(xml_subdir, xmlfile_pattern))
    xmlfiles = [xmlfile
                for xmlfile in xmlfiles
                if os.path.isfile(xmlfile)]

    # Read all the xml sponge data files.
    files = fileinput.FileInput(xmlfiles)
    header = files.readline()
    lines = [line for line in files if not files.isfirstline()]

    # Write a combined xml sponge data file.
    path = xml_subdir + os.extsep + "xml"
    handle = open(path, "w")
    handle.write(header)
    handle.write("<root>\r\n")
    handle.writelines(lines)
    handle.write("\r\n</root>")
    handle.close()

    # Remove the xml sponge data file subdirectory.
    shutil.rmtree(xml_subdir)

    return


def expand(zipdir, xmldir, zipdir_pattern, zipfile_pattern, xmlfile_pattern):
    """
    Expand zipped sponge data files.

    Expand valid tree.

    >>> _config_path = os.path.join(
    ...                    os.path.dirname(
    ...                        os.path.abspath(__file__)),
    ...                    test_path, "config.py")
    >>> zipdir,xmldir,zipdir_pattern,zipfile_pattern,xmlfile_pattern = \
            config(_config_path)
    >>> if os.path.exists(xmldir):
    ...     shutil.rmtree(xmldir)
    >>> expand(zipdir,xmldir,zipdir_pattern,zipfile_pattern,xmlfile_pattern)
    """

    # Find all the monthly directories of zipped files.
    zip_months = glob.glob(os.path.join(zipdir, zipdir_pattern))
    zip_months = [zip_month
                  for zip_month in zip_months
                  if os.path.isdir(zip_month)]

    # Create a directory for monthly XML subdirectories.
    if not os.path.exists(xmldir):
        os.mkdir(xmldir, 0755)
    elif not os.path.isdir(xmldir):
        raise IOError("XML directory name " + \
                       xmldir + \
                       " exists and is not a directory.")

    for zip_month in zip_months:
        # Create each monthly XML subdirectory.
        xml_month = os.path.join(xmldir, os.path.split(zip_month)[1])
        if not os.path.exists(xml_month):
            os.mkdir(xml_month, 0755)
        elif not os.path.isdir(xml_month):
            raise IOError("XML month subdirectory name " + \
                          xml_month + \
                          " exists and is not a directory.")

        # Find all the zip files for each month.
        zipfiles = glob.glob(os.path.join(zip_month, zipfile_pattern))
        zipfiles = [zip_file
                    for zip_file in zipfiles
                    if os.path.isfile(zip_file)]

        for zip_file in zipfiles:
            # Create an XML subdirectory for each zip file.
            xml_subdir = os.path.splitext(os.path.split(zip_file)[1])[0]
            xml_subdir = os.path.join(xml_month, xml_subdir)
            if not os.path.exists(xml_subdir):
                os.mkdir(xml_subdir, 0755)
                # Extract all the xml files in the zip file.
                archive = zipfile.ZipFile(zip_file, "r")
                archive.extractall(xml_subdir)
                combine(xml_subdir, xmlfile_pattern)
            elif not os.path.isdir(xml_subdir):
                raise IOError("XML file subdirectory name " + \
                              xml_subdir + \
                              " exists and is not a directory.")

    return

if __name__ == "__main__":
    _config_path = config_path()
    if _config_path:
        _config = config(_config_path)
        if all(_config):
            expand(*_config)