#!/usr/bin/python
# -*- coding: utf-8 -*-
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

try:
    import atexit
    import cmd
    import clint
    import codecs
    import json
    import logging
    import os
    import pdb
    import shlex
    import sys
    import time
    import types

    from clint.textui import colored
    from ConfigParser import ConfigParser, SafeConfigParser
    from urllib2 import HTTPError, URLError
    from httplib import BadStatusLine

    from prettytable import PrettyTable
    from common import __version__, config_file, config_fields
    from common import grammar, precached_verbs
    from marvin.cloudstackConnection import cloudConnection
    from marvin.cloudstackException import cloudstackAPIException
    from marvin.cloudstackAPI import *
    from marvin import cloudstackAPI
except ImportError, e:
    print "Import error in %s : %s" % (__name__, e)
    import sys
    sys.exit()

# Fix autocompletion issue, can be put in .pythonstartup
try:
    import readline
except ImportError, e:
    print "Module readline not found, autocompletions will fail", e
else:
    import rlcompleter
    if 'libedit' in readline.__doc__:
        readline.parse_and_bind("bind ^I rl_complete")
    else:
        readline.parse_and_bind("tab: complete")

log_fmt = '%(asctime)s - %(filename)s:%(lineno)s - [%(levelname)s] %(message)s'
logger = logging.getLogger(__name__)
completions = cloudstackAPI.__all__


class CloudMonkeyShell(cmd.Cmd, object):
    intro = ("☁ Apache CloudStack 🐵 cloudmonkey " + __version__ +
             ". Type help or ? to list commands.\n")
    ruler = "="
    config_file = config_file
    config_fields = config_fields
    grammar = grammar
    # datastructure {'verb': {cmd': ['api', [params], doc, required=[]]}}
    cache_verbs = precached_verbs

    def __init__(self):
        if os.path.exists(self.config_file):
            config = self.read_config()
        else:
            for key in self.config_fields.keys():
                setattr(self, key, self.config_fields[key])
            config = self.write_config()
            print "Welcome! Using `set` configure the necessary settings:"
            print " ".join(sorted(self.config_fields.keys()))
            print "Config file:", self.config_file
            print "For debugging, tail -f", self.log_file, "\n"

        for key in self.config_fields.keys():
            try:
                setattr(self, key, config.get('CLI', key))
                self.config_fields[key] = config.get('CLI', key)
            except Exception:
                print "Please fix `%s` config in %s" % (key, self.config_file)
                sys.exit()

        self.prompt = self.prompt.strip() + " "  # Cosmetic fix for prompt
        logging.basicConfig(filename=self.log_file,
                            level=logging.DEBUG, format=log_fmt)
        logger.debug("Loaded config fields:\n%s" % self.config_fields)

        cmd.Cmd.__init__(self)
        # Update config if config_file does not exist
        if not os.path.exists(self.config_file):
            config = self.write_config()

        # Enable history support
        try:
            if os.path.exists(self.history_file):
                readline.read_history_file(self.history_file)
            atexit.register(readline.write_history_file, self.history_file)
        except IOError:
            print("Error: history support")

    def read_config(self):
        config = ConfigParser()
        try:
            with open(self.config_file, 'r') as cfg:
                config.readfp(cfg)
        except IOError, e:
            self.print_shell("Error: config_file not found", e)
        return config

    def write_config(self):
        config = ConfigParser()
        config.add_section('CLI')
        for key in self.config_fields.keys():
            config.set('CLI', key, getattr(self, key))
        with open(self.config_file, 'w') as cfg:
            config.write(cfg)
        return config

    def emptyline(self):
        pass

    def cmdloop(self, intro=None):
        print self.intro
        while True:
            try:
                super(CloudMonkeyShell, self).cmdloop(intro="")
                self.postloop()
            except KeyboardInterrupt:
                print("^C")

    def print_shell(self, *args):
        try:
            for arg in args:
                arg = str(arg)
                if isinstance(type(args), types.NoneType):
                    continue
                if self.color == 'true':
                    if str(arg).count(self.ruler) == len(str(arg)):
                        print colored.green(arg),
                    elif 'Error' in arg:
                        print colored.red(arg),
                    elif ":\n=" in arg:
                        print colored.red(arg),
                    elif ':' in arg:
                        print colored.blue(arg),
                    elif 'type' in arg:
                        print colored.green(arg),
                    elif 'state' in arg or 'count' in arg:
                        print colored.magenta(arg),
                    elif 'id =' in arg:
                        print colored.yellow(arg),
                    elif 'name =' in arg:
                        print colored.cyan(arg),
                    else:
                        print arg,
                else:
                    print arg,
            print
        except Exception, e:
            print colored.red("Error: "), e

    def print_result(self, result, result_filter=None):
        if result is None or len(result) == 0:
            return

        def printer_helper(printer, toprow):
            if printer:
                print printer
            return PrettyTable(toprow)

        def print_result_tabular(result, result_filter=None):
            toprow = None
            printer = None
            for node in result:
                if toprow != node.keys():
                    if result_filter is not None and len(result_filter) != 0:
                        commonkeys = filter(lambda x: x in node.keys(),
                                            result_filter)
                        if commonkeys != toprow:
                            toprow = commonkeys
                            printer = printer_helper(printer, toprow)
                    else:
                        toprow = node.keys()
                        printer = printer_helper(printer, toprow)
                row = map(lambda x: node[x], toprow)
                if printer and row:
                    printer.add_row(row)
            if printer:
                print printer

        def print_result_as_dict(result, result_filter=None):
            for key in sorted(result.keys(),
                              key=lambda x: x != 'id' and x != 'count' and x):
                if not (isinstance(result[key], list) or
                        isinstance(result[key], dict)):
                    self.print_shell("%s = %s" % (key, result[key]))
                else:
                    self.print_shell(key + ":\n" + len(key) * self.ruler)
                    self.print_result(result[key], result_filter)

        def print_result_as_list(result, result_filter=None):
            for node in result:
                # Tabular print if it's a list of dict and tabularize is true
                if isinstance(node, dict) and self.tabularize == 'true':
                    print_result_tabular(result, result_filter)
                    break
                self.print_result(node)
                if len(result) > 1:
                    self.print_shell(self.ruler * 80)

        if isinstance(result, dict):
            print_result_as_dict(result, result_filter)
        elif isinstance(result, list):
            print_result_as_list(result, result_filter)
        elif isinstance(result, str):
            print result
        elif not (str(result) is None):
            self.print_shell(result)

    def make_request(self, command, requests={}, isAsync=False):
        conn = cloudConnection(self.host, port=int(self.port),
                               apiKey=self.apikey, securityKey=self.secretkey,
                               asyncTimeout=self.timeout, logging=logger,
                               protocol=self.protocol, path=self.path)
        response = None
        logger.debug("====START Request====")
        logger.debug("Requesting command=%s, args=%s" % (command, requests))
        try:
            response = conn.make_request_with_auth(command, requests)
        except cloudstackAPIException, e:
            self.print_shell("API Error:", e)
        except HTTPError, e:
            self.print_shell(e)
        except (URLError, BadStatusLine), e:
            self.print_shell("Connection Error:", e)
        logger.debug("====END Request====\n")

        def process_json(response):
            try:
                response = json.loads(str(response))
            except ValueError, e:
                pass
            return response

        response = process_json(response)
        if response is None:
            return

        apiname = args.partition(' ')[0]
        verb, subject = splitverbsubject(apiname)

    def get_api_module(self, api_name, api_class_strs=[]):
        try:
            api_mod = __import__("marvin.cloudstackAPI.%s" % api_name,
                                 globals(), locals(), api_class_strs, -1)
        except ImportError, e:
            self.print_shell("Error: API not found", e)
            return None
        return api_mod

    def default(self, args):
        lexp = shlex.shlex(args.strip())
        lexp.whitespace = " "
        lexp.whitespace_split = True
        lexp.posix = True
        args = []
        while True:
            next_val = lexp.next()
            if next_val is None:
                break
            args.append(next_val)
        api_name = args[0]

        args_dict = dict(map(lambda x: [x.partition("=")[0],
                                        x.partition("=")[2]],
                             args[1:])[x] for x in range(len(args) - 1))
        field_filter = None
        if 'filter' in args_dict:
            field_filter = filter(lambda x: x is not '',
                                  map(lambda x: x.strip(),
                                      args_dict.pop('filter').split(',')))

        api_cmd_str = "%sCmd" % api_name
        api_mod = self.get_api_module(api_name, [api_cmd_str])
        if api_mod is None:
            return

        try:
            api_cmd = getattr(api_mod, api_cmd_str)
        except AttributeError, e:
            self.print_shell("Error: API attribute %s not found!" % e)
            return

        for attribute in args_dict.keys():
            setattr(api_cmd, attribute, args_dict[attribute])

        command = api_cmd()
        missing_args = filter(lambda x: x not in args_dict.keys(),
                              command.required)

        if len(missing_args) > 0:
            self.print_shell("Missing arguments:", ' '.join(missing_args))
            return

        isAsync = False
        if "isAsync" in dir(command):
            isAsync = (command.isAsync == "true")

        result = self.make_request(api_name, args_dict, isAsync)
        if result is None:
            return
        try:
            responsekeys = filter(lambda x: 'response' in x, result.keys())
            for responsekey in responsekeys:
                self.print_result(result[responsekey], field_filter)
            print
        except Exception as e:
            self.print_shell("🙈  Error on parsing and printing", e)

    def completedefault(self, text, line, begidx, endidx):
        partitions = line.partition(" ")
        verb = partitions[0]
        rline = partitions[2].partition(" ")
        subject = rline[0]
        separator = rline[1]
        params = rline[2]

        if verb not in self.grammar:
            return []

        autocompletions = []
        search_string = ""

        if separator != " ":   # Complete verb subjects
            autocompletions = self.cache_verbs[verb].keys()
            search_string = subject
        else:                  # Complete subject params
            autocompletions = map(lambda x: x + "=",
                                  self.cache_verbs[verb][subject][1])
            search_string = text

        autocompletions.append("filter=")
        return [s for s in autocompletions if s.startswith(search_string)]

    def do_api(self, args):
        """
        Make raw api calls. Syntax: api <apiName> <args>=<values>.

        Example:
        api listAccount listall=true
        """
        if len(args) > 0:
            return self.default(args)
        else:
            self.print_shell("Please use a valid syntax")

    def complete_api(self, text, line, begidx, endidx):
        mline = line.partition(" ")[2]
        offs = len(mline) - len(text)
        return [s[offs:] for s in completions if s.startswith(mline)]

    def do_set(self, args):
        """
        Set config for cloudmonkey. For example, options can be:
        host, port, apikey, secretkey, log_file, history_file
        You may also edit your ~/.cloudmonkey_config instead of using set.

        Example:
        set host 192.168.56.2
        set prompt 🐵 cloudmonkey>
        set log_file /var/log/cloudmonkey.log
        """
        args = args.strip().partition(" ")
        key, value = (args[0], args[2])
        setattr(self, key, value)  # keys and attributes should have same names
        self.prompt = self.prompt.strip() + " " # prompt fix
        self.write_config()

    def complete_set(self, text, line, begidx, endidx):
        mline = line.partition(" ")[2]
        offs = len(mline) - len(text)
        return [s[offs:] for s in self.config_fields.keys()
                if s.startswith(mline)]

    def do_shell(self, args):
        """
        Execute shell commands using shell <command> or !<command>

        Example:
        !ls
        shell ls
        !for((i=0; i<10; i++)); do cloudmonkey create user account=admin \
            email=test@test.tt firstname=user$i lastname=user$i \
            password=password username=user$i; done
        """
        os.system(args)

    def do_help(self, args):
        """
        Show help docs for various topics

        Example:
        help list
        help list users
        ?list
        ?list users
        """
        fields = args.partition(" ")
        if fields[2] == "":
            cmd.Cmd.do_help(self, args)
        else:
            verb = fields[0]
            subject = fields[2].partition(" ")[0]

            if subject in self.cache_verbs[verb]:
                self.print_shell(self.cache_verbs[verb][subject][2])
            else:
                self.print_shell("Error: no such api (%s) on %s" %
                                 (subject, verb))

    def complete_help(self, text, line, begidx, endidx):
        fields = line.partition(" ")
        subfields = fields[2].partition(" ")

        if subfields[1] != " ":
            return cmd.Cmd.complete_help(self, text, line, begidx, endidx)
        else:
            line = fields[2]
            text = subfields[2]
            return self.completedefault(text, line, begidx, endidx)

    def do_exit(self, args):
        """
        Quit CloudMonkey CLI
        """
        return self.do_quit(args)

    def do_quit(self, args):
        """
        Quit CloudMonkey CLI
        """
        self.print_shell("Bye!")
        return self.do_EOF(args)

    def do_EOF(self, args):
        """
        Quit on Ctrl+d or EOF
        """
        sys.exit()


def main():
    # Create handlers on the fly using closures
    self = CloudMonkeyShell
    global grammar
    for rule in grammar:
        def add_grammar(rule):
            def grammar_closure(self, args):
                if '|' in args:  # FIXME: Consider parsing issues
                    prog_name = sys.argv[0]
                    if '.py' in prog_name:
                        prog_name = "python " + prog_name
                    self.do_shell("%s %s %s" % (prog_name, rule, args))
                    return
                try:
                    args_partition = args.partition(" ")
                    res = self.cache_verbs[rule][args_partition[0]]
                except KeyError, e:
                    self.print_shell("Error: invalid %s api arg" % rule, e)
                    return
                if ' --help' in args or ' -h' in args:
                    self.print_shell(res[2])
                    return
                self.default(res[0] + " " + args_partition[2])
            return grammar_closure

        grammar_handler = add_grammar(rule)
        grammar_handler.__doc__ = "%ss resources" % rule.capitalize()
        grammar_handler.__name__ = 'do_' + rule
        setattr(self, grammar_handler.__name__, grammar_handler)

    shell = CloudMonkeyShell()
    if len(sys.argv) > 1:
        shell.onecmd(' '.join(sys.argv[1:]))
    else:
        shell.cmdloop()

if __name__ == "__main__":
    main()