# Simple Finite State Machine used to control states
import json
from scm import eval, _, GLOBAL_ENV, stringify, load
from time import perf_counter
from chat import chat
from persona import ManualIntervention
from sensors import get_sensor_value
from control import fixed_duty_wrapper
from actuators import actuators
from utils import consumption_diff, consumption_to_string, stohms

MY_GLOBAL_ENV = (
    _('make-duty-controller', 4, fixed_duty_wrapper,
      _('format-time', 1, lambda x: stohms(x.car),
        GLOBAL_ENV)))

def safe_eval(data, env, notify=True):
    try:
        return eval(data, env)
    except Exception as e:
        err = ' '.join(('evaluating:', data, ':', str(e)))
        if notify:
            chat.send_sync(err)
            return True
        return err

def load_phase(json):
    def fallback(v):
        return json.get(v, '#t')
    return Phase(
        json['name'], json['description'],
        onexit=fallback('on_exit'),
        onload=fallback('on_load'),
        nextcond=fallback('exit_condition'))

def load_recipe(json):
    return Recipe(
        json['name'], json['description'],
        json.get('controllers', ()),
        [load_phase(p) for p in json['phases']])

def load_recipes(file):
    with open(file, "r") as f:
        recipes = json.loads(f.read())
    return [load_recipe(recipe) for recipe in recipes]

def store_recipes(file, recipes):
    print(file, recipes)
    with open(file, "w") as f:
        f.write(json.dumps(recipes, indent=2))

def manual_intervention_wrapper(state):
    def wrapper(args):
        label = None
        options = None
        if len(args) > 0:
            label = stringify(args.car, quote=False)
            if len(args) > 1:
                options = tuple(
                    (stringify(o.car, quote=False), o.cdr.car)
                    for o in args.cdr.car)
        resp = state.manual.get(label, options)
        if resp[0]:
            print('REQUESTING CLIENT UPDATE')
            state.onupdate()
        return resp[1]
    return wrapper


class State():
    def __init__(self, recipe_file, onupdate=lambda: None):
        self.recipes  = load_recipes(recipe_file)
        self.recipe_file = recipe_file
        self.recipe   = None
        self.phase    = None
        self.manual   = ManualIntervention()
        self.baseenv  = (
            _('get-sensor', 1, lambda x: get_sensor_value(stringify(x.car, quote=False)),
              _('set-actuator', 2, self.set_actuator,
                _('notify', 1, lambda x: chat.send_sync(stringify(x.car, quote=False)),
                  _('hours', 1, lambda x: x.car * 60 * 60,
                    _('minutes', 1, lambda x: x.car * 60,
                      _('seconds', 1, lambda x: x.car,
                        _('manual-intervention', -1, manual_intervention_wrapper(self),
                          _('set-target', 2, self.set_target,
                            _('get-sensor-target', 1, self.get_sensor_target,
                              _('get-controller-target', 1, self.get_controller_target,
                                _('set-controller', 2, self.set_controller,
                                  _('reload-recipes', 0, lambda x: self.reloadRecipes(),
                                    MY_GLOBAL_ENV)))))))))))))
        self.env = self.baseenv
        self.envdata  = {}
        self.onupdate = onupdate

    def reloadRecipes(self):
        # chat.send_sync("Reloading recipes!")
        print("Reloading recipes!")
        self.recipes  = load_recipes(self.recipe_file)

    def getState(self):
        return {
            'phase': self.phase,
            'phase-time': int(self.phase_time()),
            'phase-consumption': consumption_to_string(self.phase_consumption()),
            'recipe-time': int(self.recipe_time()),
            'recipe-consumption': consumption_to_string(self.recipe_consumption())
        }

    def now(self):
        return perf_counter()

    def postload(self):
        if self.recipe is None:
            return
        self.phase = 0
        self.env = (
            _('recipe-name', 0, lambda _: self.recipe.name,
              _('recipe-description', 0, lambda _: self.recipe.description,
                _('recipe-consumption', 0, lambda _: self.recipe_consumption(),
                  _('recipe-time', 0, lambda _: self.recipe_time(),
                    _('time-in-this-phase', 0, lambda _: self.phase_time(),
                      _('phase-consumption', 0, lambda _: self.phase_consumption(),
                        _('phase-time', 0, lambda _: self.phase_time(),
                          self.baseenv))))))))
        self.envdata['controllers'] = {}
        for controller in self.recipe.controllers:
            name, ctrl = safe_eval(controller, self.env)
            self.envdata['controllers'][name] = ctrl
        self.envdata['sensors'] = {}
        self.envdata['recipe-start-consumption'] = self.get_total_consumption()
        self.envdata['current-recipe-loadtime'] = self.now()
        self.loadphase(self.phase)

    def recipeById(self, id):
        try:
            id = int(id)
        except:
            id = -1
        print(self.recipes)
        if id > -1 and id < len(self.recipes):
            return self.recipes[id]
        return None

    def loadByIdx(self, recipe):
        self.recipe = self.recipeById(recipe)
        self.postload()

    def stop(self):
        self.current_phase().exit(self.env)
        self.done(message='(concat "Recipe " (recipe-name) " stopped manually")')

    def loadByName(self, recipe):
        r = tuple(i for (i, r) in enumerate(self.recipes) if r.name == recipe)
        if len(r) > 0:
            self.recipe = self.recipes[r[0]]
            self.postload()

    def current_phase(self):
        if self.recipe is None:
            return None
        if self.phase >= len(self.recipe.phases) or self.phase < 0:
            return None
        return self.recipe.phases[self.phase]

    def check(self):
        return self.current_phase().satisfied_p(self.env)

    def run_step(self):
        # Update sensor values
        for sensor in self.envdata.get('sensors', ()):
            _, ctrl, target = self.envdata['sensors'][sensor]
            self.envdata['sensors'][sensor] = (get_sensor_value(sensor), ctrl, target)
        # Apply actuators
        for controller in self.envdata.get('controllers', {}).keys():
            ctrl = self.envdata['controllers'][controller]
            try:
                if ctrl.input_label not in self.envdata['sensors'].keys():
                    print(f'Missing sensor {ctrl.input_label}')
                    continue
                response = ctrl.apply(self.envdata['sensors'][ctrl.input_label][0])
                actuators[controller].enable(response)
            except Exception as e:
                print(f"UNKNOWN BUG HERE in run_step {e}")
        if self.check():
            if self.next() is None:
                return True
            print(f'Waiting for {self.current_phase().nextcond}')
        return False

    def next(self):
        self.current_phase().exit(self.env)

        if self.phase < len(self.recipe.phases) - 1:
            self.phase += 1
            phase = self.recipe.phases[self.phase]
            self.loadphase(self.phase)
            self.manual.clear()
            return phase
        self.onupdate()
        return None

    def phase_time(self, arg=None):
        start = self.envdata.get('current-phase-loadtime', 0)
        return start and self.now() - start

    def recipe_time(self, arg=None):
        start = self.envdata.get('current-recipe-loadtime', 0)
        return start and self.now() - start

    def loadphase(self, phaseidx):
        phase = self.recipe.phases[phaseidx]
        self.envdata['current-phase-loadtime'] = self.now()
        self.envdata['current-phase-start-consumption'] = self.get_total_consumption()
        resp = safe_eval(phase.onload, self.env)
        self.onupdate()
        return resp

    def done(self, message=None):
        self.envdata['recipe-done-consumption'] = self.get_total_consumption()
        self.recipe.done(self.env, message)
        # Stop all actuators
        for controller in self.envdata.get('controllers', {}).keys():
            actuators[controller].disable()
        self.recipe = None
        self.env = self.baseenv
        self.envdata = {}
        self.onupdate()

    def set_target(self, args):
        sensor, target = (stringify(args.car, quote=False), args.cdr.car)
        # We get the controller, and set it to target
        value, controller, _ = self.envdata['sensors'][sensor]
        self.envdata['sensors'][sensor] = (value, controller, target)
        self.envdata['controllers'][controller].set_target(target)
        print('setting sensor', sensor, controller, 'to target', target)

    def get_sensor_target(self, args):
        sensor = stringify(args.car, quote=False)
        if sensor not in self.envdata['sensors'].keys():
            print(f'Sensor {sensor} not found')
            return None
        _, controller, target = self.envdata['sensors'][sensor]
        if controller is None:
            print('Sensor has no associated controller')
            return None
        return target

    def get_controller_target(self, args):
        controller = stringify(args.car, quote=False)
        if controller not in self.envdata['controllers'].keys():
            print(f'Controller {controller} not found')
            return None
        return self.envdata['controllers'][controller].get_target()

    def set_controller(self, args):
        controller, sensor = (stringify(args.car, quote=False),
                          stringify(args.cdr.car, quote=False))
        self.envdata['controllers'][controller].set_input_label(sensor)
        # Value/Controller/Target
        self.envdata['sensors'][sensor] = (get_sensor_value(sensor), controller, None)
        print('linking sensor', sensor, 'to controller', controller,
              '(', self.envdata['controllers'][controller], ')')

    def set_actuator(self, args):
        actuator, value = (stringify(args.car, quote=False), args.cdr.car)
        if value:
            actuators[actuator].enable()
        else:
            actuators[actuator].disable()
        print('setting actuator', actuator, 'to value', value,
              ', remember to change it manually if stopping?')

    def get_total_consumption(self):
        return {actuator: actuators[actuator].consumption() for
                actuator in actuators.keys()}

    def phase_consumption(self):
        before = self.envdata.get('current-phase-start-consumption', {})
        after = self.get_total_consumption()
        return consumption_diff(before, after)

    def recipe_consumption(self):
        return consumption_diff(
            self.envdata.get('recipe-start-consumption', {}),
            self.get_total_consumption())


class Recipe():
    def __init__(self, name, description='',
                 controllers=(),
                 phases=[]):
        self.name = name
        self.controllers = controllers
        self.description = description
        self.phases = phases

    def getState(self, currentphase=None):
        def phasetodict(i, p):
            return {
                'name': p.name,
                'text': p.text,
                'nextcond': p.nextcond,
                'current': currentphase == i,
                # 'loaded_time': p.loaded_time,
                'onload': p.onload,
                'onexit': p.onexit,
                # 'envdata': p.envdata
            }
            
        return {
            'name': self.name,
            'description': self.description,
            'controllers': self.controllers,
            'phases': [
                phasetodict(i, p)
                for (i, p) in enumerate(self.phases)
            ],
            # 'phase': self.phase
        }

    def done(self, env, message=None):
        message = message or '''
        (concat "Recipe " (recipe-name) " completed at " (now)
        " in " (format-time (recipe-time)) ", Consumption: " (recipe-consumption))
        '''
        # 
        safe_eval(f'(notify {message})', env)

class Phase():
    def __init__(self, name, text='', nextcond='#t', onload='', onexit=''):
        self.name = name
        self.text = text
        self.nextcond = nextcond
        self.onload = onload
        self.onexit = onexit
        # self.loaded_time = None
        # self.env = env
        # self.envdata = {}

    def satisfied_p(self, env):
        return safe_eval(self.nextcond, env)

    def exit(self, env):
        value = safe_eval(self.onexit, env)
        message = '''
(notify
 (concat "Phase done in " (format-time (phase-time))
         ", with consumption: " (phase-consumption)))
        '''
        safe_eval(message, env)
        return value

    def revert(self, env):
        # Undo state changes (attuators values)
        pass