#!/usr/bin/env python
# coding: utf-8

# This file is part of Supysonic.
#
# Supysonic is a Python implementation of the Subsonic server API.
# Copyright (C) 2013, 2014  Alban 'spl0k' Féron
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import sys, cmd, argparse, getpass, time
from supysonic import config

from supysonic.db import get_store, Folder, User
from supysonic.managers.folder import FolderManager
from supysonic.managers.user import UserManager
from supysonic.scanner import Scanner

class CLIParser(argparse.ArgumentParser):
	def error(self, message):
		self.print_usage(sys.stderr)
		raise RuntimeError(message)

class CLI(cmd.Cmd):
	prompt = "supysonic> "

	def _make_do(self, command):
		def method(obj, line):
			try:
				args = getattr(obj, command + '_parser').parse_args(line.split())
			except RuntimeError, e:
				print >>sys.stderr, e
				return

			if hasattr(obj.__class__, command + '_subparsers'):
				try:
					func = getattr(obj, '{}_{}'.format(command, args.action))
				except AttributeError:
					return obj.default(line)
				return func(** { key: vars(args)[key] for key in vars(args) if key != 'action' })
			else:
				try:
					func = getattr(obj, command)
				except AttributeError:
					return obj.default(line)
				return func(**vars(args))

		return method

	def __init__(self, store):
		cmd.Cmd.__init__(self)

		# Generate do_* and help_* methods
		for parser_name in filter(lambda attr: attr.endswith('_parser') and '_' not in attr[:-7], dir(self.__class__)):
			command = parser_name[:-7]

			if not hasattr(self.__class__, 'do_' + command):
				setattr(self.__class__, 'do_' + command, self._make_do(command))

			if hasattr(self.__class__, 'do_' + command) and not hasattr(self.__class__, 'help_' + command):
				setattr(self.__class__, 'help_' + command, getattr(self.__class__, parser_name).print_help)
			if hasattr(self.__class__, command + '_subparsers'):
				for action, subparser in getattr(self.__class__, command + '_subparsers').choices.iteritems():
					setattr(self, 'help_{} {}'.format(command, action), subparser.print_help)

		self.__store = store

	def do_EOF(self, line):
		return True

	do_exit = do_EOF

	def default(self, line):
		print 'Unknown command %s' % line.split()[0]
		self.do_help(None)

	def postloop(self):
		print

	def completedefault(self, text, line, begidx, endidx):
		command = line.split()[0]
		parsers = getattr(self.__class__, command + '_subparsers', None)
		if not parsers:
			return []

		num_words = len(line[len(command):begidx].split())
		if num_words == 0:
			return [ a for a in parsers.choices.keys() if a.startswith(text) ]
		return []

	folder_parser = CLIParser(prog = 'folder', add_help = False)
	folder_subparsers = folder_parser.add_subparsers(dest = 'action')
	folder_subparsers.add_parser('list', help = 'Lists folders', add_help = False)
	folder_add_parser = folder_subparsers.add_parser('add', help = 'Adds a folder', add_help = False)
	folder_add_parser.add_argument('name', help = 'Name of the folder to add')
	folder_add_parser.add_argument('path', help = 'Path to the directory pointed by the folder')
	folder_del_parser = folder_subparsers.add_parser('delete', help = 'Deletes a folder', add_help = False)
	folder_del_parser.add_argument('name', help = 'Name of the folder to delete')
	folder_scan_parser = folder_subparsers.add_parser('scan', help = 'Run a scan on specified folders', add_help = False)
	folder_scan_parser.add_argument('folders', metavar = 'folder', nargs = '*', help = 'Folder(s) to be scanned. If ommitted, all folders are scanned')
	folder_scan_parser.add_argument('-f', '--force', action = 'store_true', help = "Force scan of already know files even if they haven't changed")

	def folder_list(self):
		print 'Name\t\tPath\n----\t\t----'
		print '\n'.join('{0: <16}{1}'.format(f.name, f.path) for f in self.__store.find(Folder, Folder.root == True))

	def folder_add(self, name, path):
		ret = FolderManager.add(self.__store, name, path)
		if ret != FolderManager.SUCCESS:
			print FolderManager.error_str(ret)
		else:
			print "Folder '{}' added".format(name)

	def folder_delete(self, name):
		ret = FolderManager.delete_by_name(self.__store, name)
		if ret != FolderManager.SUCCESS:
			print FolderManager.error_str(ret)
		else:
			print "Deleted folder '{}'".format(name)

	def folder_scan(self, folders, force):

		class TimedProgressDisplay:
			def __init__(self, name, interval = 5):
				self.__name = name
				self.__interval = interval
				self.__last_display = 0
				self.__last_len = 0

			def __call__(self, scanned, total):
				if time.time() - self.__last_display > self.__interval or scanned == total:
					if not self.__last_len:
						sys.stdout.write("Scanning '{0}': ".format(self.__name))

					progress = "{0}% ({1}/{2})".format((scanned * 100) / total, scanned, total)
					sys.stdout.write('\b' * self.__last_len)
					sys.stdout.write(progress)
					sys.stdout.flush()

					self.__last_len = len(progress)
					self.__last_display = time.time()

		scanner = Scanner(self.__store, force)
		if folders:
			folders = map(lambda n: self.__store.find(Folder, Folder.name == n, Folder.root == True).one() or n, folders)
			if any(map(lambda f: isinstance(f, basestring), folders)):
				print "No such folder(s): " + ' '.join(f for f in folders if isinstance(f, basestring))
			for folder in filter(lambda f: isinstance(f, Folder), folders):
				scanner.scan(folder, TimedProgressDisplay(folder.name))
		else:
			for folder in self.__store.find(Folder, Folder.root == True):
				scanner.scan(folder, TimedProgressDisplay(folder.name))

		scanner.finish()
		added, deleted = scanner.stats()
		self.__store.commit()

		print
		print "Scanning done"
		print 'Added: %i artists, %i albums, %i tracks' % (added[0], added[1], added[2])
		print 'Deleted: %i artists, %i albums, %i tracks' % (deleted[0], deleted[1], deleted[2])

	user_parser = CLIParser(prog = 'user', add_help = False)
	user_subparsers = user_parser.add_subparsers(dest = 'action')
	user_subparsers.add_parser('list', help = 'List users', add_help = False)
	user_add_parser = user_subparsers.add_parser('add', help = 'Adds a user', add_help = False)
	user_add_parser.add_argument('name', help = 'Name/login of the user to add')
	user_add_parser.add_argument('-a', '--admin', action = 'store_true', help = 'Give admin rights to the new user')
	user_add_parser.add_argument('-p', '--password', help = "Specifies the user's password")
	user_add_parser.add_argument('-e', '--email', default = '', help = "Sets the user's email address")
	user_del_parser = user_subparsers.add_parser('delete', help = 'Deletes a user', add_help = False)
	user_del_parser.add_argument('name', help = 'Name/login of the user to delete')
	user_admin_parser = user_subparsers.add_parser('setadmin', help = 'Enable/disable admin rights for a user', add_help = False)
	user_admin_parser.add_argument('name', help = 'Name/login of the user to grant/revoke admin rights')
	user_admin_parser.add_argument('--off', action = 'store_true', help = 'Revoke admin rights if present, grant them otherwise')
	user_pass_parser = user_subparsers.add_parser('changepass', help = "Changes a user's password", add_help = False)
	user_pass_parser.add_argument('name', help = 'Name/login of the user to which change the password')
	user_pass_parser.add_argument('password', nargs = '?', help = 'New password')

	def user_list(self):
		print 'Name\t\tAdmin\tEmail\n----\t\t-----\t-----'
		print '\n'.join('{0: <16}{1}\t{2}'.format(u.name, '*' if u.admin else '', u.mail) for u in self.__store.find(User))

	def user_add(self, name, admin, password, email):
		if not password:
			password = getpass.getpass()
			confirm  = getpass.getpass('Confirm password: ')
			if password != confirm:
				print >>sys.stderr, "Passwords don't match"
				return
		status = UserManager.add(self.__store, name, password, email, admin)
		if status != UserManager.SUCCESS:
			print >>sys.stderr, UserManager.error_str(status)

	def user_delete(self, name):
		user = self.__store.find(User, User.name == name).one()
		if not user:
			print >>sys.stderr, 'No such user'
		else:
			self.__store.remove(user)
			self.__store.commit()
			print "User '{}' deleted".format(name)

	def user_setadmin(self, name, off):
		user = self.__store.find(User, User.name == name).one()
		if not user:
			print >>sys.stderr, 'No such user'
		else:
			user.admin = not off
			self.__store.commit()
			print "{0} '{1}' admin rights".format('Revoked' if off else 'Granted', name)

	def user_changepass(self, name, password):
		if not password:
			password = getpass.getpass()
			confirm  = getpass.getpass('Confirm password: ')
			if password != confirm:
				print >>sys.stderr, "Passwords don't match"
				return
		status = UserManager.change_password2(self.__store, name, password)
		if status != UserManager.SUCCESS:
			print >>sys.stderr, UserManager.error_str(status)
		else:
			print "Successfully changed '{}' password".format(name)

if __name__ == "__main__":
	if not config.check():
		sys.exit(1)

	cli = CLI(get_store(config.get('base', 'database_uri')))
	if len(sys.argv) > 1:
		cli.onecmd(' '.join(sys.argv[1:]))
	else:
		cli.cmdloop()