import math
import data_centre.plugin_collection
from data_centre.plugin_collection import ActionsPlugin, SequencePlugin, DisplayPlugin

class LFOModulationPlugin(ActionsPlugin,SequencePlugin,DisplayPlugin):

    MAX_LFOS = 4

    # active = True (toggle_lfo_active) to enable sending of modulation
    active = False

    # for keeping track of LFO levels
    level = [0.0]*MAX_LFOS #, 0.0, 0.0, 0.0]

    stop_flag = False
    pause_flag = False
    def __init__(self, plugin_collection):
        super().__init__(plugin_collection)

        #self.PRESET_FILE_NAME = "ShaderLoopRecordPlugin/frames.json"

        self.pc.shaders.root.after(1000, self.start_plugin)
        
    def start_plugin(self):
        self.pc.shaders.root.after(0, self.run_automation)

    # DisplayPlugin methods
    def get_display_modes(self):
        return ['LFOMODU','NAV_LFO']

    def show_plugin(self, display, display_mode):
        from tkinter import Text, END
        #super(DisplayPlugin).show_plugin(display, display_mode)
        display.display_text.insert(END, '{} \n'.format(display.body_title))
        display.display_text.insert(END, "LFOModulationPlugin ")

        display.display_text.insert(END, "ACTIVE" if self.active else "not active")

        display.display_text.insert(END, "\tSpeed: {:4.2f}% {}\n\n".format(self.speed*100, display.get_speed_indicator(self.speed/2.0, convert=False)))

        for lfo,value in enumerate(self.level):
            display.display_text.insert(END, "lfo {} level: {:4.2f}% {}\t".format(lfo,value*100,display.get_bar(value)))
            display.display_text.insert(END, "{}\t{}\n".format(self.last_lfo_status[lfo], display.get_bar(self.last_lfo_value[lfo])))
            display.display_text.insert(END, "\t%s\n" % self.formula[lfo])


    # ActionsPlugin methods
    @property
    def parserlist(self):
        return [ 
                ( r"^set_lfo_modulation_([0-3])_level$", self.set_lfo_modulation_level ),
                ( r"^toggle_lfo_active$", self.toggle_lfo_active ),
                ( r"^set_lfo_speed", self.set_lfo_speed )
                # TODO: changing formulas and LFO modes, speed
        ]

    def set_lfo_modulation_level(self, slot, value):
        self.level[slot] = value

    def set_lfo_speed(self, speed):
        self.speed = -4*(0.5-(speed))

    def toggle_lfo_active(self):
        self.active = not self.active

    # Formula handling for generating automation
    # mapping 0-3 to match the LFO 
    # TODO: save & load this to config file, make editable
    formula = [
            "f_sin",
            "f_double_cos",
            "f_invert_sin",
            #"f_invert_double_cos",
            "f_linear"
    ]

    # run the formula for the stored lfo configuration
    last_lfo_status = [None]*MAX_LFOS # for displaying status
    last_lfo_value = [None]*MAX_LFOS
    #lfo_speed = [1.0]*MAX_LFOS
    def getLFO(self, position, lfo):
        lfo_value = getattr(self,self.formula[lfo])(position, self.level[lfo])
        self.last_lfo_value[lfo] = lfo_value
        self.last_lfo_status[lfo] = "sent {:03.1f}%".format(lfo_value*100.0)
        return lfo_value

    # built-in waveshapes
    # outgoing values should be between 0 and 1!!
    # todo: more of the these, and better!
    def f_sin(self, position, level):
        #return level * (( math.sin(position*math.pi)))
        value = math.sin(position * math.pi * 2) / 2
        value *= level
        value += 0.5 # normalise to range 0 - 1

        return value

    def f_invert_sin(self, position, level):
        return 1.0 - self.f_sin(position, level)

    def f_double_cos(self, position, level):
        return self.f_sin(math.cos(position*math.pi), level)

    def f_invert_double_cos(self, position, level):
        return 1.0 - self.f_double_cos(position, level)

    def f_linear(self, position, level):
        return position * level

    # SequencePlugin methods
    def run_sequence(self, position):
        import time
        now = time.time()

        if self.pc.data.plugins is None: # not initialised yet
            return

        if not self.active: # output is disabled
            return

        for lfo in range(0,self.MAX_LFOS):
            if self.level[lfo]>0.0:
                self.pc.actions.call_method_name(
                        "modulate_param_%s_to_amount_continuous"%lfo, 
                        self.getLFO(position, lfo)
                )