#!/usr/bin/env python
import sys
import os
import optparse
import subprocess
import re
from pip.log import logger
from pip.baseparser import parser
from pip.exceptions import InstallationError
from pip.basecommand import command_dict, load_command, load_all_commands
from pip.vcs import vcs, get_src_requirement, import_vcs_support

def autocomplete():
    """Command and option completion for the main option parser (and options)
    and its subcommands (and options).

    Enable by sourcing one of the completion shell scripts (bash or zsh).
    """
    # Don't complete if user hasn't sourced bash_completion file.
    if not os.environ.has_key('PIP_AUTO_COMPLETE'):
        return
    cwords = os.environ['COMP_WORDS'].split()[1:]
    cword = int(os.environ['COMP_CWORD'])
    try:
        current = cwords[cword-1]
    except IndexError:
        current = ''
    load_all_commands()
    subcommands = [cmd for cmd, cls in command_dict.items() if not cls.hidden]
    options = []
    # subcommand
    if cword == 1:
        # show options of main parser only when necessary
        if current.startswith('-') or current.startswith('--'):
            subcommands += [opt.get_opt_string()
                            for opt in parser.option_list
                            if opt.help != optparse.SUPPRESS_HELP]
        print ' '.join(filter(lambda x: x.startswith(current), subcommands))
    # subcommand options
    # special case: the 'help' subcommand has no options
    elif cwords[0] in subcommands and cwords[0] != 'help':
        subcommand = command_dict.get(cwords[0])
        options += [(opt.get_opt_string(), opt.nargs)
                    for opt in subcommand.parser.option_list
                    if opt.help != optparse.SUPPRESS_HELP]
        # filter out previously specified options from available options
        prev_opts = [x.split('=')[0] for x in cwords[1:cword-1]]
        options = filter(lambda (x, v): x not in prev_opts, options)
        # filter options by current input
        options = [(k, v) for k, v in options if k.startswith(current)]
        for option in options:
            opt_label = option[0]
            # append '=' to options which require args
            if option[1]:
                opt_label += '='
            print opt_label
    sys.exit(1)

def main(initial_args=None):
    if initial_args is None:
        initial_args = sys.argv[1:]
    autocomplete()
    options, args = parser.parse_args(initial_args)
    if options.help and not args:
        args = ['help']
    if not args:
        parser.error('You must give a command (use "pip help" see a list of commands)')
    command = args[0].lower()
    load_command(command)
    ## FIXME: search for a command match?
    if command not in command_dict:
        parser.error('No command by the name %(script)s %(arg)s\n  (maybe you meant "%(script)s install %(arg)s")'
                     % dict(script=os.path.basename(sys.argv[0]), arg=command))
    command = command_dict[command]
    return command.main(initial_args, args[1:], options)


############################################################
## Writing freeze files


class FrozenRequirement(object):

    def __init__(self, name, req, editable, comments=()):
        self.name = name
        self.req = req
        self.editable = editable
        self.comments = comments

    _rev_re = re.compile(r'-r(\d+)$')
    _date_re = re.compile(r'-(20\d\d\d\d\d\d)$')

    @classmethod
    def from_dist(cls, dist, dependency_links, find_tags=False):
        location = os.path.normcase(os.path.abspath(dist.location))
        comments = []
        if vcs.get_backend_name(location):
            editable = True
            req = get_src_requirement(dist, location, find_tags)
            if req is None:
                logger.warn('Could not determine repository location of %s' % location)
                comments.append('## !! Could not determine repository location')
                req = dist.as_requirement()
                editable = False
        else:
            editable = False
            req = dist.as_requirement()
            specs = req.specs
            assert len(specs) == 1 and specs[0][0] == '=='
            version = specs[0][1]
            ver_match = cls._rev_re.search(version)
            date_match = cls._date_re.search(version)
            if ver_match or date_match:
                svn_backend = vcs.get_backend('svn')
                if svn_backend:
                    svn_location = svn_backend(
                        ).get_location(dist, dependency_links)
                if not svn_location:
                    logger.warn(
                        'Warning: cannot find svn location for %s' % req)
                    comments.append('## FIXME: could not find svn URL in dependency_links for this package:')
                else:
                    comments.append('# Installing as editable to satisfy requirement %s:' % req)
                    if ver_match:
                        rev = ver_match.group(1)
                    else:
                        rev = '{%s}' % date_match.group(1)
                    editable = True
                    req = 'svn+%s@%s#egg=%s' % (svn_location, rev, cls.egg_name(dist))
        return cls(dist.project_name, req, editable, comments)

    @staticmethod
    def egg_name(dist):
        name = dist.egg_name()
        match = re.search(r'-py\d\.\d$', name)
        if match:
            name = name[:match.start()]
        return name

    def __str__(self):
        req = self.req
        if self.editable:
            req = '-e %s' % req
        return '\n'.join(list(self.comments)+[str(req)])+'\n'

############################################################
## Requirement files


def call_subprocess(cmd, show_stdout=True,
                    filter_stdout=None, cwd=None,
                    raise_on_returncode=True,
                    command_level=logger.DEBUG, command_desc=None,
                    extra_environ=None):
    if command_desc is None:
        cmd_parts = []
        for part in cmd:
            if ' ' in part or '\n' in part or '"' in part or "'" in part:
                part = '"%s"' % part.replace('"', '\\"')
            cmd_parts.append(part)
        command_desc = ' '.join(cmd_parts)
    if show_stdout:
        stdout = None
    else:
        stdout = subprocess.PIPE
    logger.log(command_level, "Running command %s" % command_desc)
    env = os.environ.copy()
    if extra_environ:
        env.update(extra_environ)
    try:
        proc = subprocess.Popen(
            cmd, stderr=subprocess.STDOUT, stdin=None, stdout=stdout,
            cwd=cwd, env=env)
    except Exception, e:
        logger.fatal(
            "Error %s while executing command %s" % (e, command_desc))
        raise
    all_output = []
    if stdout is not None:
        stdout = proc.stdout
        while 1:
            line = stdout.readline()
            if not line:
                break
            line = line.rstrip()
            all_output.append(line + '\n')
            if filter_stdout:
                level = filter_stdout(line)
                if isinstance(level, tuple):
                    level, line = level
                logger.log(level, line)
                if not logger.stdout_level_matches(level):
                    logger.show_progress()
            else:
                logger.info(line)
    else:
        returned_stdout, returned_stderr = proc.communicate()
        all_output = [returned_stdout or '']
    proc.wait()
    if proc.returncode:
        if raise_on_returncode:
            if all_output:
                logger.notify('Complete output from command %s:' % command_desc)
                logger.notify('\n'.join(all_output) + '\n----------------------------------------')
            raise InstallationError(
                "Command %s failed with error code %s"
                % (command_desc, proc.returncode))
        else:
            logger.warn(
                "Command %s had error code %s"
                % (command_desc, proc.returncode))
    if stdout is not None:
        return ''.join(all_output)

import_vcs_support()

if __name__ == '__main__':
    exit = main()
    if exit:
        sys.exit(exit)