#!/usr/bin/env python

from getpass import getuser
from optparse import OptionParser
from os.path import basename
from sys import argv, exit, stdin
from pithos.lib.client import Client, Fault

import json
import logging

DEFAULT_HOST = '127.0.0.1:8000'
DEFAULT_API = 'v1'

_cli_commands = {}

def cli_command(*args):
    def decorator(cls):
        cls.commands = args
        for name in args:
            _cli_commands[name] = cls
        return cls
    return decorator

def class_for_cli_command(name):
    return _cli_commands[name]

def print_dict(d, header='name'):
    if header:
        print d.pop(header)
    for key, val in sorted(d.items()):
        print '%s: %s' % (key.rjust(15), val)


class Command(object):
    def __init__(self, argv):
        parser = OptionParser()
        parser.add_option('--host', dest='host', metavar='HOST', default=DEFAULT_HOST,
                            help='use server HOST')
        parser.add_option('--user', dest='user', metavar='USERNAME', default=getuser(),
                            help='use account USERNAME')
        parser.add_option('--api', dest='api', metavar='API', default=DEFAULT_API,
                            help='use api API')
        parser.add_option('-v', action='store_true', dest='verbose', default=False,
                            help='use verbose output')
        parser.add_option('-d', action='store_true', dest='debug', default=False,
                            help='use debug output')
        self.add_options(parser)
        options, args = parser.parse_args(argv)
        
        # Add options to self
        for opt in parser.option_list:
            key = opt.dest
            if key:
                val = getattr(options, key)
                setattr(self, key, val)
        
        self.client = Client(self.host, self.user, self.api, self.verbose, self.debug)
        
        self.parser = parser
        self.args = args
    
    def add_options(self, parser):
        pass

    def execute(self, *args):
        pass


@cli_command('list', 'ls')
class List(Command):
    syntax = '[container]'
    description = 'list containers or objects'
    
    def add_options(self, parser):
        parser.add_option('-l', action='store_true', dest='detail',
                          default=False, help='show detailed output')
        parser.add_option('-n', action='store', type='int', dest='limit',
                          default=1000, help='show limited output')
        parser.add_option('--marker', action='store', type='str',
                          dest='marker', default=None,
                          help='show output greater then marker')
        parser.add_option('--prefix', action='store', type='str',
                          dest='prefix', default=None,
                          help='show output starting with prefix')
        parser.add_option('--delimiter', action='store', type='str',
                          dest='delimiter', default=None,
                          help='show output up to the delimiter')
        parser.add_option('--path', action='store', type='str',
                          dest='path', default=None,
                          help='show output starting with prefix up to /')
        parser.add_option('--meta', action='store', type='str',
                          dest='meta', default=None,
                          help='show output having the specified meta keys')
        parser.add_option('--if-modified-since', action='store', type='str',
                          dest='if_modified_since', default=None,
                          help='show output if modified since then')
        parser.add_option('--if-unmodified-since', action='store', type='str',
                          dest='if_unmodified_since', default=None,
                          help='show output if not modified since then')
        
    def execute(self, container=None):
        if container:
            self.list_objects(container)
        else:
            self.list_containers()
    
    def list_containers(self):
        l = self.client.list_containers(self.detail, self.limit, self.marker,
                                        self.if_modified_since,
                                        self.if_unmodified_since)
        if self.detail:
            for container in l:
                print_dict(container)
                print
        else:
            if self.verbose:
                print l
            else:
                print l.split('Traceback')[0]

    def list_objects(self, container):
        l = self.client.list_objects(container, self.detail, self.limit,
                                        self.marker, self.prefix,
                                        self.delimiter, self.path,
                                        self.meta,
                                        self.if_modified_since,
                                        self.if_unmodified_since)
        if self.detail:
            for obj in l:
                print_dict(obj)
                print
        else:
            if self.verbose:
                print l
            else:
                print l.split('Traceback')[0]

@cli_command('meta')
class Meta(Command):
    syntax = '[<container>[/<object>]]'
    description = 'get the metadata of an account, a container or an object'

    def execute(self, path=''):
        container, sep, object = path.partition('/')
        if object:
            meta = self.client.retrieve_object_metadata(container, object)
        elif container:
            meta = self.client.retrieve_container_metadata(container)
        else:
            meta = self.client.account_metadata()
        print_dict(meta, header=None)


@cli_command('create')
class CreateContainer(Command):
    syntax = '<container>'
    description = 'create a container'
    
    def execute(self, container):
        ret = self.client.create_container(container)
        if not ret:
            print 'Container already exists'


@cli_command('delete', 'rm')
class Delete(Command):
    syntax = '<container>[/<object>]'
    description = 'delete a container or an object'
    
    def execute(self, path):
        container, sep, object = path.partition('/')
        if object:
            self.client.delete_object(container, object)
        else:
            self.client.delete_container(container)


@cli_command('get')
class GetObject(Command):
    syntax = '<container>/<object>'
    description = 'get the data of an object'
    
    def execute(self, path):
        container, sep, object = path.partition('/')
        print self.client.retrieve_object(container, object)


@cli_command('put')
class PutObject(Command):
    syntax = '<container>/<object> <path>'
    description = 'create or update an object with contents of path'

    def execute(self, path, srcpath):
        container, sep, object = path.partition('/')
        f = open(srcpath) if srcpath != '-' else stdin
        data = f.read()
        self.client.create_object(container, object, data)
        f.close()


@cli_command('copy', 'cp')
class CopyObject(Command):
    syntax = '<src container>/<src object> [<dst container>/]<dst object>'
    description = 'copies an object to a different location'
    
    def execute(self, src, dst):
        src_container, sep, src_object = src.partition('/')
        dst_container, sep, dst_object = dst.partition('/')
        if not sep:
            dst_container = src_container
            dst_object = dst
        self.client.copy_object(src_container, src_object, dst_container, dst_object)

@cli_command('set')
class SetMeta(Command):
    syntax = '[<container>[/<object>]] key=val [key=val] [...]'
    description = 'set metadata'
    
    def execute(self, path, *args):
        #in case of account fix the args
        print path
        if path.find('='):
            args = list(args)
            args.append(path)
            args = tuple(args)
            path = ''
        meta = {}
        for arg in args:
            key, sep, val = arg.partition('=')
            meta[key.strip()] = val.strip()
        container, sep, object = path.partition('/')
        if object:
            self.client.update_object_metadata(container, object, **meta)
        elif container:
            self.client.update_container_metadata(container, **meta)
        else:
            self.client.update_account_metadata(**meta)

def print_usage():
    cmd = Command([])
    parser = cmd.parser
    parser.usage = '%prog <command> [options]'
    parser.print_help()
    
    commands = []
    for cls in set(_cli_commands.values()):
        name = ', '.join(cls.commands)
        description = getattr(cls, 'description', '')
        commands.append('  %s %s' % (name.ljust(12), description))
    print '\nCommands:\n' + '\n'.join(sorted(commands))



def main():
    try:
        name = argv[1]
        cls = class_for_cli_command(name)
    except (IndexError, KeyError):
        print_usage()
        exit(1)

    cmd = cls(argv[2:])
    
    try:
        cmd.execute(*cmd.args)
    except TypeError:
        cmd.parser.usage = '%%prog %s [options] %s' % (name, cmd.syntax)
        cmd.parser.print_help()
        exit(1)
    except Fault, f:
        print f.data


if __name__ == '__main__':
    main()