#!/usr/bin/env python

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

import json
import logging
import types

DEFAULT_HOST = 'pithos.dev.grnet.gr'
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]

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>[/<object>]]'
    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):
        params = {'limit':self.limit, 'marker':self.marker}
        headers = {'IF_MODIFIED_SINCE':self.if_modified_since,
                   'IF_UNMODIFIED_SINCE':self.if_unmodified_since}
        l = self.client.list_containers(self.detail, params, headers)
        print_list(l)

    def list_objects(self, container):
        params = {'limit':self.limit, 'marker':self.marker,
                  'prefix':self.prefix, 'delimiter':self.delimiter,
                  'path':self.path, 'meta':self.meta}
        headers = {'IF_MODIFIED_SINCE':self.if_modified_since,
                   'IF_UNMODIFIED_SINCE':self.if_unmodified_since}
        l = self.client.list_objects(container, self.detail, params, headers)
        print_list(l)

@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()
        if meta == None:
            print 'Entity does not exist'
        else:
            print_dict(meta, header=None)

@cli_command('create')
class CreateContainer(Command):
    syntax = '<container> [key=val] [...]'
    description = 'create a container'
    
    def execute(self, container, *args):
        headers = {}
        for arg in args:
            key, sep, val = arg.partition('=')
            headers['X_CONTAINER_META_%s' %key.strip().upper()] = val.strip()
        ret = self.client.create_container(container, headers)
        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 add_options(self, parser):
        parser.add_option('-l', action='store_true', dest='detail',
                          default=False, help='show detailed output')
        parser.add_option('--range', action='store', dest='range',
                          default=None, help='show range of data')
        parser.add_option('--if-match', action='store', dest='if-match',
                          default=None, help='show output if ETags match')
        parser.add_option('--if-none-match', action='store',
                          dest='if-none-match', default=None,
                          help='show output if ETags don\'t match')
        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')
        parser.add_option('-f', action='store', type='str',
                          dest='file', default=None,
                          help='save output in file')

    def execute(self, path):
        headers = {}
        if self.range:
            headers['RANGE'] = 'bytes=%s' %self.range
        attrs = ['if-match', 'if-none-match', 'if-modified-since',
                 'if-unmodified-since']
        attrs = [a for a in attrs if getattr(self, a)]
        for a in attrs:
            headers[a.replace('-', '_').upper()] = getattr(self, a)
        container, sep, object = path.partition('/')
        data = self.client.retrieve_object(container, object, self.detail,
                                          headers)
        if self.file:
            if self.detail:
                f = self.file and open(self.file, 'w') or stdout
                data = json.loads(data)
                print_dict(data, f=f)
            else:
                fw = open(self.file, 'w')
                fw.write(data)
                fw.close()
        else:
            print data

@cli_command('put')
class PutObject(Command):
    syntax = '<container>/<object> <path> [key=val] [...]'
    description = 'create/override object with path contents or standard input'

    def add_options(self, parser):
        parser.add_option('--chunked', action='store_true', dest='chunked',
                          default=False, help='set chunked transfer mode')
        parser.add_option('--etag', action='store', dest='etag',
                          default=None, help='check written data')
        parser.add_option('--content-encoding', action='store',
                          dest='content-encoding', default=None,
                          help='provide the object MIME content type')
        parser.add_option('--content-disposition', action='store', type='str',
                          dest='content-disposition', default=None,
                          help='provide the presentation style of the object')
        parser.add_option('--manifest', action='store', type='str',
                          dest='manifest', default=None,
                          help='use for large file support')

    def execute(self, path, srcpath, *args):
        headers = {}
        if self.manifest:
            headers['X_OBJECT_MANIFEST'] = self.manifest
            
        attrs = ['etag', 'content-encoding', 'content-disposition']
        attrs = [a for a in attrs if getattr(self, a)]
        for a in attrs:
            headers[a.replace('-', '_').upper()] = getattr(self, a)
        
        #prepare user defined meta
        for arg in args:
            key, sep, val = arg.partition('=')
            headers['X_OBJECT_META_%s' %key.strip().upper()] = val.strip()
        
        container, sep, object = path.partition('/')
        
        f = srcpath != '-' and open(srcpath) or stdin
        chunked = (self.chunked or f == stdin) and True or False
        self.client.create_object(container, object, f, chunked=chunked,
                                  headers=headers)
        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
        if path.find('=') != -1:
            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)

@cli_command('update')
class UpdateObject(Command):
    syntax = '<container>/<object> path [key=val] [...]'
    description = 'update object metadata/data'
    
    def add_options(self, parser):
        parser.add_option('-a', action='store_true', dest='append',
                          default=None, help='append data')
        parser.add_option('--start', action='store',
                          dest='start',
                          default=None, help='range of data to be updated')
        parser.add_option('--range', action='store', dest='content-range',
                          default=None, help='range of data to be updated')
        parser.add_option('--chunked', action='store_true', dest='chunked',
                          default=False, help='set chunked transfer mode')
        parser.add_option('--content-encoding', action='store',
                          dest='content-encoding', default=None,
                          help='provide the object MIME content type')
        parser.add_option('--content-disposition', action='store', type='str',
                          dest='content-disposition', default=None,
                          help='provide the presentation style of the object')
        parser.add_option('--manifest', action='store', type='str',
                          dest='manifest', default=None,
                          help='use for large file support')

    def execute(self, path, srcpath, *args):
        headers = {}
        if self.manifest:
            headers['X_OBJECT_MANIFEST'] = self.manifest
        
        if self.append:
            headers['CONTENT_RANGE'] = 'bytes */*'
        elif self.start:
            headers['CONTENT_RANGE'] = 'bytes %s-/*' % self.first-byte-pos
        
        attrs = ['content-encoding', 'content-disposition']
        attrs = [a for a in attrs if getattr(self, a)]
        for a in attrs:
            headers[a.replace('-', '_').upper()] = getattr(self, a)
        
        #prepare user defined meta
        for arg in args:
            key, sep, val = arg.partition('=')
            headers['X_OBJECT_META_%s' %key.strip().upper()] = val.strip()
        
        container, sep, object = path.partition('/')
        
        f = srcpath != '-' and open(srcpath) or stdin
        chunked = (self.chunked or f == stdin) and True or False
        self.client.update_object(container, object, f, chunked=chunked,
                                  headers=headers)
        f.close()

@cli_command('move', 'mv')
class MoveObject(Command):
    syntax = '<src container>/<src object> [<dst container>/]<dst object>'
    description = 'moves 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.move_object(src_container, src_object, dst_container,
                                dst_object)

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 print_dict(d, header='name', f=stdout):
    header = header in d and header or 'subdir'
    if header and header in d:
        f.write('%s\n' %d.pop(header))
    for key, val in sorted(d.items()):
        f.write('%s: %s\n' % (key.rjust(15), val))

def print_list(l, verbose=False, f=stdout):
    for elem in l:
        #if it's empty string continue
        if not elem:
            continue
        if type(elem) == types.DictionaryType:
            print_dict(elem, f=f)
        elif type(elem) == types.StringType:
            if not verbose:
                elem = elem.split('Traceback')[0]
            f.write('%s\n' % elem)
        else:
            f.write('%s\n' % elem)

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()