import math
import cairo

from typing import Iterable, List

from hexagram.pattern import HexagonPattern
from hexagram.gauge   import Gauge
from hexagram.dial    import Dial
from hexagram.speedo  import Speedo
from hexagram.tacho   import Tacho
from hexagram.fuel    import FuelGauge
from hexagram.thermo  import ThermoGauge

class ShiftIndicator(Gauge):
    __slots__ = 'x', 'y', 'rpm_min', 'rpm_redline', 'rpm_max',

    LIGHT_WIDTH   = 48
    LIGHT_HEIGHT  = 12
    LIGHT_SPACING =  8
    LIGHT_LOW     =  0.25

    LIGHT_COLORS = (
        (0.0, 1.0, 0.0),
        (0.6, 1.0, 0.0),
        (1.0, 1.0, 0.0),
        (1.0, 0.6, 0.0),
        (1.0, 0.0, 0.0),
    )

    LIGHT_LEVELS = (
        (0, 8),
        (1, 7),
        (2, 6),
        (3, 5),
        (4,),
    )

    def __init__(self, x: float, y: float, rpm_min: float, rpm_redline: float, rpm_max: float):
        self.value       = 0
        self.x           = x
        self.y           = y
        self.rpm_min     = rpm_min
        self.rpm_redline = rpm_redline
        self.rpm_max     = rpm_max

    def draw_level(self, cr: cairo.Context, level: int, on: bool=False):
        r = self.LIGHT_COLORS[level][0]
        g = self.LIGHT_COLORS[level][1]
        b = self.LIGHT_COLORS[level][2]

        if not on:
            r *= self.LIGHT_LOW
            g *= self.LIGHT_LOW
            b *= self.LIGHT_LOW

        cr.set_source_rgb(r, g, b)

        for i in self.LIGHT_LEVELS[level]:
            x = i * (self.LIGHT_WIDTH + self.LIGHT_SPACING)

            cr.rectangle(self.x + x,
                            self.y,
                            self.LIGHT_WIDTH,
                            self.LIGHT_HEIGHT)

            cr.fill()

    def draw_bg(self, cr: cairo.Context):
        for level in range(0, len(self.LIGHT_LEVELS)):
            self.draw_level(cr, level)

    def draw_fg(self, cr: cairo.Context):
        if self.value < self.rpm_min:
            return

        level = math.ceil((self.value - self.rpm_min) / self.rpm_redline)

        for l in range(0, len(self.LIGHT_LEVELS)):
            self.draw_level(cr, level, l >= level)

class Odometer(Gauge):
    __slots__ = 'x', 'y',

    def __init__(self, x: float, y: float):
        self.value = 0
        self.x     = x
        self.y     = y

    def draw_bg(self, cr: cairo.Context):
        pass

    def draw_fg(self, cr: cairo.Context):
        cr.set_source_rgb(1, 1, 1)
        cr.select_font_face("Muli",
                            cairo.FontSlant.NORMAL,
                            cairo.FontWeight.BOLD)

        cr.set_font_size(24)

        cr.move_to(self.x, self.y)
        cr.show_text("%d mi" % self.value)

class AmbientTemp(Gauge):
    __slots__ = 'x', 'y',

    def __init__(self, x: float, y: float):
        self.value = 0
        self.x     = x
        self.y     = y

    def draw_bg(self, cr: cairo.Context):
        pass

    def draw_fg(self, cr: cairo.Context):
        cr.set_source_rgb(1, 1, 1)
        cr.select_font_face("Muli",
                            cairo.FontSlant.NORMAL,
                            cairo.FontWeight.BOLD)

        cr.set_font_size(24)

        cr.move_to(self.x, self.y)
        cr.show_text("%.1f°C" % self.value)

class Clock(Gauge):
    __slots__ = 'x', 'y',

    def __init__(self, x: float, y: float):
        self.value = 0
        self.x     = x
        self.y     = y

    def draw_bg(self, cr: cairo.Context):
        pass

    def draw_fg(self, cr: cairo.Context):
        cr.set_source_rgb(1, 1, 1)
        cr.select_font_face("Muli",
                            cairo.FontSlant.NORMAL,
                            cairo.FontWeight.BOLD)

        cr.set_font_size(24)

        cr.move_to(self.x, self.y)
        cr.show_text("%d:%02d" % (
            (self.value - (self.value % 60)) / 60,
             self.value % 60
        ))

class Cluster():
    __slots__ = 'gauges', 'speedo', 'fuel', 'tacho', 'thermo', 'odo', \
                'ambient', 'clock'

    WIDTH  = 1280
    HEIGHT =  480

    SHIFT_INDICATOR_X = 392
    SHIFT_INDICATOR_Y =  24

    def __init__(self, rpm_min: float, rpm_redline: float, rpm_max: float):
        self.gauges: List[Gauge] = list()

        self.speedo = Speedo(self.HEIGHT / 2,
                             self.HEIGHT / 2,
                             self.HEIGHT / 2,
                             200.0)

        self.fuel = FuelGauge(self.HEIGHT / 2,
                              self.HEIGHT / 2,
                              self.HEIGHT / 2)

        self.tacho = Tacho(self.WIDTH - self.HEIGHT / 2,
                           self.HEIGHT / 2,
                           self.HEIGHT / 2,
                           8000)

        self.thermo = ThermoGauge(self.WIDTH - self.HEIGHT / 2,
                                  self.HEIGHT / 2,
                                  self.HEIGHT / 2)

        self.odo     = Odometer(0.8 * self.HEIGHT, self.HEIGHT - 16)
        self.ambient = AmbientTemp(self.WIDTH - self.HEIGHT, self.HEIGHT - 16)
        self.clock   = Clock(self.WIDTH / 2 - 32, self.HEIGHT - 16)

        self.gauges.append(self.speedo)
        self.gauges.append(self.fuel)
        self.gauges.append(self.tacho)
        self.gauges.append(self.thermo)
        self.gauges.append(self.odo)
        self.gauges.append(self.ambient)
        self.gauges.append(self.clock)

        self.gauges.append(ShiftIndicator(self.SHIFT_INDICATOR_X,
                                          self.SHIFT_INDICATOR_Y,
                                          rpm_min,
                                          rpm_redline,
                                          rpm_max))

    def draw_bg(self, cr: cairo.Context):
        cr.set_source_rgb(0.1, 0.1, 0.1)
        cr.rectangle(0, 0, self.WIDTH, self.HEIGHT)
        cr.fill()

        cr.rectangle(0, 0, self.WIDTH, self.HEIGHT)

        pattern = HexagonPattern()
        pattern.fill(cr)

        # Top dark area
        cr.set_source_rgba(0, 0, 0, 0.5)
        cr.rectangle(0, 0, self.WIDTH, 64)
        cr.fill()

        cr.set_source_rgba(1, 1, 1, 0.25)
        cr.move_to(0, 64)
        cr.line_to(self.WIDTH, 64)
        cr.stroke()

        # Bottom dark area
        cr.set_source_rgba(0, 0, 0, 0.5)
        cr.rectangle(0, self.HEIGHT - 52, self.WIDTH, 52)
        cr.fill()

        cr.set_source_rgba(1, 1, 1, 0.25)
        cr.move_to(0, self.HEIGHT - 52)
        cr.line_to(self.WIDTH, self.HEIGHT - 52)
        cr.stroke()

        for gauge in self.gauges:
            gauge.draw_bg(cr)

    def draw_fg(self, cr: cairo.Context):
        for gauge in self.gauges:
            fn = getattr(gauge, 'draw_fg', None)

            if fn is not None:
                fn(cr)