#!/usr/bin/env python
#
# Copyright (C) 2014  Antonio Ospite <ao2@ao2.it>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import sys
from array import array
import wx
from wx.lib.pubsub import setuparg1
from wx.lib.pubsub import pub


class Canvas:

    def __init__(self, width, height, internal_radius, scale=10):
        self.width = width
        self.height = height
        self.scale = scale

        self.internal_radius = float(internal_radius * scale)
        self.external_radius = float(height + internal_radius) * scale

        self.radius = float(height * scale)

        self.ring_width = self.radius / height
        self.sector_width = 360. / width

        self.Reset()

    def Reset(self):
        self.pixels_array = array('B', [0] * self.width * self.height * 3)
        self.last_pixel = None

    def toCartesian(self, r, theta):
        x = int(theta / self.sector_width)
        y = int(r / self.ring_width) - int(self.internal_radius / self.scale)
        return (x, y)

    def toPolar(self, x, y):
        r = y * self.ring_width + self.internal_radius
        theta = x * self.sector_width
        return (r, theta)

    def setPixelColor(self, r, theta, color):
        if r < self.internal_radius or r > self.external_radius:
            print "invalid coordinates (r: %f)" % r
            return

        x, y = self.toCartesian(r, theta)

        self.last_pixel = (x, y)

        offset = y * self.width * 3 + x * 3
        self.pixels_array[offset + 0] = color[0]
        self.pixels_array[offset + 1] = color[1]
        self.pixels_array[offset + 2] = color[2]

        # now tell anyone who cares that the value has been changed
        pub.sendMessage("NEW PIXEL", self.last_pixel)

    def getPixelColor(self, x, y):
        offset = y * self.width * 3 + x * 3
        color = [self.pixels_array[offset + i] for i in range(0, 3)]
        return tuple(color)

    def getColors(self):
        colors = set()
        for x in range(self.width):
            for y in range(self.height):
                colors.add(self.getPixelColor(x, y))
        return list(colors)

    # The code below has been copied from the C implementation in PatternPaint:
    # https://github.com/Blinkinlabs/PatternPaint
    def saveAsAnimation(self, filename):
        output_file = open(filename, "w")

        colors = self.getColors()

        output_file.write("const PROGMEM prog_uint8_t animationData[]  = {\n")

        output_file.write("// Length of the color table - 1, in bytes. length: 1 byte\n")
        output_file.write("   %d,\n" % (len(colors) - 1))

        output_file.write("// Color table section. Each entry is 3 bytes. length: %d bytes\n" % (len(colors) * 3))

        color_map = {}
        for i, c in enumerate(colors):
            output_file.write(" %3d, %3d, %3d,\n" % (c[0], c[1], c[2]))
            color_map[c] = i

        output_file.write("// Pixel runs section. Each pixel run is 2 bytes. length: -1 bytes\n")

        for x in range(self.width):
            run_count = 0
            for y in range(self.height):
                new_color = color_map[self.getPixelColor(x, y)]
                if run_count == 0:
                    current_color = new_color

                if current_color != new_color:
                    output_file.write(" %3d, %3d,\n" % (run_count, current_color))
                    run_count = 1
                    current_color = new_color
                else:
                    run_count += 1

            output_file.write(" %3d, %3d,\n" % (run_count, current_color))

        output_file.write("};\n\n")

        output_file.write("#define NUM_FRAMES %d\n" % self.width)
        output_file.write("#define NUM_LEDS %d\n" % self.height)
        output_file.write("Animation animation(NUM_FRAMES, animationData, NUM_LEDS);\n")
        output_file.close()