"""

Integrierte Spannungsmessung

Ideen:
  - Umschaltung Datenquelle: intern, N2K
  - Umschaltung analog / digital / Graphik
  - Historische Werte vom YD-Batteriemonitor

"""

import cairo
import math
from .page import Page

class Voltage(Page):

    avg = (1, 10, 60, 300);

    def __init__(self, pageno, cfg, boatdata):
        super().__init__(pageno, cfg, boatdata)
        self.trend = True
        self.mode = 'A'
        self.avgindex = 0
        self.buttonlabel[1] = 'AVG'
        self.buttonlabel[2] = 'MODE'
        self.buttonlabel[5] = 'TRD'
        self.lastvalue = self.bd.voltage.value

    def handle_key(self, buttonid):
        if buttonid == 1:
            if self.avgindex < len(self.avg) -1:
                self.avgindex += 1
            else:
                self.avgindex = 0
        elif buttonid == 2:
            if self.mode == 'A':
                self.mode = 'D'
            else:
                self.mode = 'A'
        elif buttonid == 5:
            self.trend = not self.trend

    def setBoatValue(self, boatvalue):
        # Einstellen welcher Wert dargestellt werden soll
        self.value1 = boatvalue

    def draw(self, ctx):
        ctx.select_font_face("Ubuntu", cairo.FontSlant.NORMAL, cairo.FontWeight.BOLD)
        if self.mode == 'A':
            self.draw_analog(ctx)
        else:
            self.draw_digital(ctx)

    def draw_analog(self, ctx):
        # TODO schönes Viertelkreis-Instrument
        # Skala von 9V bis 15V
        # d.h. 90° entsprechend unterteilen in 6 Stücke je 15°
        # Beschriftung 10, 11, 12, 13, 14

        # Datenquelle
        ctx.set_font_size(16)
        ctx.move_to(300, 40)
        ctx.show_text("Source:")
        ctx.move_to(300, 60)
        ctx.show_text("VBat")

        # Batterietyp
        ctx.move_to(300, 90)
        ctx.show_text("Type:")
        ctx.move_to(300, 110)
        ctx.show_text("AGM")

        # Glättung
        ctx.move_to(300, 140)
        ctx.show_text("Avg:")
        ctx.move_to(300, 160)
        ctx.show_text("1s")
        ctx.stroke()

        # Gleichstromsymbol
        ctx.set_font_size(32)
        ctx.move_to(20, 80)
        ctx.show_text("V")
        ctx.set_line_width(3)
        ctx.move_to(20, 86.5) # obere Linie
        ctx.line_to(40, 86.5)
        ctx.move_to(20, 91.5) # untere drei kurzen Linien
        ctx.line_to(25, 91.5)
        ctx.move_to(27, 91.5)
        ctx.line_to(33, 91.5)
        ctx.move_to(35, 91.5)
        ctx.line_to(40, 91.5)
        ctx.stroke()

        # Kreis-segment 90°

        # Rotationszentrum
        cx = 260
        cy = 270

        # Radius des Instruments
        r = 240

        ctx.set_source_rgb(*self.fgcolor)
        ctx.set_line_width(2)

        ctx.arc(cx, cy, r, math.pi, 1.5*math.pi)
        ctx.stroke()


        # Beschriftung
        ctx.set_font_size(20)
        label = {285: "10", 300: "11", 315: "12", 330: "13", 345: "14"}
        for angle in label:
            x, y = self.rotate((cx, cy), ((cx, cy - r + 30),), angle)[0]
            self.draw_text_center(ctx, x, y, label[angle])

        # grobe Skala
        p = ((cx, cy-r), (cx, cy - r + 12))
        ctx.set_line_width(2)
        for angle in label:
            line = self.rotate((cx, cy), p, angle)
            ctx.move_to(*line[0])
            ctx.line_to(*line[1])
        ctx.stroke()

        # feine Skala
        p = ((cx, cy-r), (cx, cy - r + 5))
        ctx.set_line_width(1)
        for angle in [x for x in range(273, 360, 3)]:
            if angle in label:
                continue
            line = self.rotate((cx, cy), p, angle)
            ctx.move_to(*line[0])
            ctx.line_to(*line[1])
        ctx.stroke()

        # Zeiger auf 0-Position
        val = float(self.bd.voltage.format())
        if not val:
            angle = -0.5
        elif val > 15:
            angle = 91
        elif val <= 9:
            angle = -0.5
        else:
            angle = (val - 9) * 15
        p = ((cx - 2, cy + 4),
             (cx - r + 35, cy + 2),
             (cx - r + 35, cy + 1),
             (cx - r + 5,  cy + 1),
             (cx - r + 5,  cy - 1),
             (cx - r + 35, cy - 1),
             (cx - r + 35, cy - 2),
             (cx - 2, cy - 4))
        zeiger = self.rotate((cx, cy), p, angle)

        # Zeiger zeichnen
        ctx.set_line_width(1)
        ctx.move_to(*zeiger[0])
        for point in zeiger[1:]:
            ctx.line_to(*point)
        ctx.fill()

        # Zeigerbasis 
        ctx.arc(cx, cy, 6, 0, 2*math.pi)
        ctx.set_source_rgb(*self.bgcolor)
        ctx.fill_preserve()
        ctx.set_line_width(2)
        ctx.set_source_rgb(*self.fgcolor)
        ctx.stroke()

    def draw_digital(self, ctx):
        # Name
        ctx.set_font_size(60) 
        ctx.move_to(20, 100)
        ctx.show_text("VBat")
        # Unit
        ctx.set_font_size(40)
        ctx.move_to(270, 100)
        ctx.show_text("V")
        # Battery type
        ctx.set_font_size(16)
        ctx.move_to(294, 100)
        ctx.show_text("AGM")
        # Mittelwert
        ctx.move_to(320, 84)
        ctx.show_text("Avg: {}s".format(self.avg[self.avgindex]))
        ctx.stroke()

        ctx.select_font_face("DSEG7 Classic")
        ctx.set_font_size(100)
        ctx.move_to(40, 240)
        ctx.show_text(self.bd.voltage.format())
        ctx.stroke()

        # Trendanzeige
        if self.trend and self.bd.voltage.value and self.lastvalue:
            ctx.rectangle(315, 183, 35, 4)
            ctx.fill()
            size = 11
            if self.lastvalue < self.bd.voltage.value:
                ctx.move_to(320, 174)
                ctx.line_to(320+size*2, 174)
                ctx.line_to(320+size, 174-size*2)
                ctx.line_to(320, 174)
                ctx.fill()
            elif self.lastvalue > self.bd.voltage.value:
                ctx.move_to(320, 195)
                ctx.line_to(320+size*2, 195)
                ctx.line_to(320+size, 195+size*2)
                ctx.line_to(320, 195)
                ctx.fill()

        self.lastvalue = self.bd.voltage.value