from kivy.uix.widget import Widget
from kivy.properties import AliasProperty, BooleanProperty, \
                            ListProperty, StringProperty
from kivy.uix.behaviors import ButtonBehavior

from .action import Action
from . import debug_print
import time
from transitions.extensions import HierarchicalMachine as Machine

class Key(ButtonBehavior, Widget):
    STATES = [
        'initial',
        'configuring',
        'configured',
        'loading',
        'failed',
        {
            'name': 'loaded',
            'children': ['no_config', 'no_actions', 'running']
        }
    ]

    TRANSITIONS = [
        {
            'trigger': 'configure',
            'source': 'initial',
            'dest': 'configuring'
        },
        {
            'trigger': 'fail',
            'source': 'configuring',
            'dest': 'failed',
            'after': 'key_loaded_callback'
        },
        {
            'trigger': 'success',
            'source': 'configuring',
            'dest': 'configured',
            'after': 'load'
        },
        {
            'trigger': 'no_config',
            'source': 'configuring',
            'dest': 'loaded_no_config',
            'after': 'key_loaded_callback'
        },
        {
            'trigger': 'load',
            'source': 'configured',
            'dest': 'loading'
        },
        {
            'trigger': 'fail',
            'source': 'loading',
            'dest': 'failed',
            'after': 'key_loaded_callback'
        },
        {
            'trigger': 'success',
            'source': 'loading',
            'dest': 'loaded',
            'after': 'key_loaded_callback'
        },
        {
            'trigger': 'no_actions',
            'source': 'loading',
            'dest': 'loaded_no_actions',
            'after': 'key_loaded_callback'
        },
        {
            'trigger': 'reload',
            'source': ['loaded','failed'],
            'dest': 'configuring',
            'after': 'key_loaded_callback'
        },
        {
            'trigger': 'run',
            'source': 'loaded',
            'dest': 'loaded_running',
            'after': 'finish',
            # if a child, like loaded_no_actions, has no transitions, then it is
            # bubbled to the parent, and we don't want that.
            'conditions': ['is_loaded']
        },
        {
            'trigger': 'finish',
            'source': 'loaded_running',
            'dest': 'loaded'
        }
    ]

    key_sym = StringProperty(None)
    custom_color = ListProperty([0, 1, 0])
    description_title = StringProperty("")
    description = ListProperty([])
    state = StringProperty("")

    def get_alias_color(self):
        if self.is_loaded_inactive():
            return [1, 1, 1, 1]
        elif self.is_loaded(allow_substates=True):
            return [*self.custom_color, 1]
        elif self.is_failed():
            return [0, 0, 0, 1]
        else:
            return [*self.custom_color, 100/255]
    def set_alias_color(self):
        pass

    color = AliasProperty(get_alias_color, set_alias_color,
            bind=['state', 'custom_color'])

    def __init__(self, **kwargs):
        self.actions = []
        Machine(model=self, states=self.STATES,
                transitions=self.TRANSITIONS, initial='initial',
                ignore_invalid_triggers=True, queued=True)
        super(Key, self).__init__(**kwargs)

    # Kivy events
    def on_key_sym(self, key, key_sym):
        if key_sym != "":
            self.configure()

    def on_press(self):
        self.list_actions()

    # Machine states / events
    def is_loaded_or_failed(self):
        return self.is_loaded(allow_substates=True) or self.is_failed()

    def is_loaded_inactive(self):
        return self.is_loaded_no_config() or self.is_loaded_no_actions()

    def on_enter_configuring(self):
        if self.key_sym in self.parent.key_config:
            self.config = self.parent.key_config[self.key_sym]

            self.actions = []
            for key_action in self.config['actions']:
                self.add_action(key_action[0], **key_action[1])

            if 'description' in self.config['properties']:
                self.set_description(self.config['properties']['description'])
            if 'color' in self.config['properties']:
                self.set_color(self.config['properties']['color'])
            self.success()
        else:
            self.no_config()

    def on_enter_loading(self):
        if len(self.actions) > 0:
            for action in self.actions:
                action.load()
        else:
            self.no_actions()

    def on_enter_loaded_running(self, modifiers):
        self.parent.parent.ids['KeyList'].append(self.key_sym)
        debug_print("running actions for {}".format(self.key_sym))
        start_time = time.time()
        self.parent.start_running(self, start_time)
        action_number = 0
        for self.current_action in self.actions:
            if self.parent.keep_running(self, start_time):
                self.list_actions(action_number=action_number + 0.5)
                self.current_action.run()
                action_number += 1
                self.list_actions(action_number=action_number)

        self.parent.finished_running(self, start_time)

    # This one cannot be in the Machine state since it would be queued to run
    # *after* the loop is ended...
    def interrupt(self):
        self.current_action.interrupt()

    # Callbacks
    def key_loaded_callback(self):
        self.parent.key_loaded_callback()

    def callback_action_ready(self, action, success):
        if not success:
            self.fail()
        elif all(action.is_loaded_or_failed() for action in self.actions):
            self.success()

    # Setters
    def set_description(self, description):
        if description[0] is not None:
            self.description_title = str(description[0])
        self.description = []
        for desc in description[1 :]:
            if desc is None:
                self.description.append("")
            else:
                self.description.append(str(desc).replace(" ", " "))

    def set_color(self, color):
        color = [x / 255 for x in color]
        self.custom_color = color

    # Actions handling
    def add_action(self, action_name, **arguments):
        self.actions.append(Action(action_name, self, **arguments))

    def list_actions(self, action_number=0):
        self.parent.parent.ids['ActionList'].update_list(self, action_number)