# MicroPython SSD1306 OLED driver, I2C and SPI interfaces
from micropython import const
import time
import framebuf
import sys

currentBoard = ""
if(sys.platform == "esp8266"):
    currentBoard = "esp8266"
elif(sys.platform == "esp32"):
    currentBoard = "esp32"
elif(sys.platform == "pyboard"):
    currentBoard = "pyboard"
    import pyb
# register definitions
SET_CONTRAST = const(0x81)
SET_ENTIRE_ON = const(0xa4)
SET_NORM_INV = const(0xa6)
SET_DISP = const(0xae)
SET_MEM_ADDR = const(0x20)
SET_COL_ADDR = const(0x21)
SET_PAGE_ADDR = const(0x22)
SET_DISP_START_LINE = const(0x40)
SET_SEG_REMAP = const(0xa0)
SET_MUX_RATIO = const(0xa8)
SET_COM_OUT_DIR = const(0xc0)
SET_DISP_OFFSET = const(0xd3)
SET_COM_PIN_CFG = const(0xda)
SET_DISP_CLK_DIV = const(0xd5)
SET_PRECHARGE = const(0xd9)
SET_VCOM_DESEL = const(0xdb)
SET_CHARGE_PUMP = const(0x8d)


class SSD1306:
    def __init__(self, width, height, external_vcc):
        self.width = width
        self.height = height
        self.external_vcc = external_vcc
        self.pages = self.height // 8
        self.buffer = bytearray(self.pages * self.width)
        self.framebuf = framebuf.FrameBuffer(
            self.buffer, self.width, self.height, framebuf.MVLSB)
        self.poweron()
        self.init_display()

    def init_display(self):
        for cmd in (
            SET_DISP | 0x00,  # off
            # address setting
            SET_MEM_ADDR, 0x00,  # horizontal
            # resolution and layout
            SET_DISP_START_LINE | 0x00,
            SET_SEG_REMAP | 0x01,  # column addr 127 mapped to SEG0
            SET_MUX_RATIO, self.height - 1,
            SET_COM_OUT_DIR | 0x08,  # scan from COM[N] to COM0
            SET_DISP_OFFSET, 0x00,
            SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12,
            # timing and driving scheme
            SET_DISP_CLK_DIV, 0x80,
            SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1,
            SET_VCOM_DESEL, 0x30,  # 0.83*Vcc
            # display
            SET_CONTRAST, 0xff,  # maximum
            SET_ENTIRE_ON,  # output follows RAM contents
            SET_NORM_INV,  # not inverted
            # charge pump
            SET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,
                SET_DISP | 0x01):  # on
            self.write_cmd(cmd)
        self.fill(0)
        self.show()

    def poweroff(self):
        self.write_cmd(SET_DISP | 0x00)

    def contrast(self, contrast):
        self.write_cmd(SET_CONTRAST)
        self.write_cmd(contrast)

    def invert(self, invert):
        self.write_cmd(SET_NORM_INV | (invert & 1))

    def show(self):
        x0 = 0
        x1 = self.width - 1
        if self.width == 64:
            # displays with width of 64 pixels are shifted by 32
            x0 += 32
            x1 += 32
        self.write_cmd(SET_COL_ADDR)
        self.write_cmd(x0)
        self.write_cmd(x1)
        self.write_cmd(SET_PAGE_ADDR)
        self.write_cmd(0)
        self.write_cmd(self.pages - 1)
        self.write_data(self.buffer)

    def fill(self, col):
        self.framebuf.fill(col)

    def pixel(self, x, y, col):
        self.framebuf.pixel(x, y, col)

    def scroll(self, dx, dy):
        self.framebuf.scroll(dx, dy)

    def text(self, string, x, y, col=1):
        self.framebuf.text(string, x, y, col)

    def hline(self, x, y, w, col):
        self.framebuf.hline(x, y, w, col)

    def vline(self, x, y, h, col):
        self.framebuf.vline(x, y, h, col)

    def line(self, x1, y1, x2, y2, col):
        self.framebuf.line(x1, y1, x2, y2, col)

    def rect(self, x, y, w, h, col):
        self.framebuf.rect(x, y, w, h, col)

    def fill_rect(self, x, y, w, h, col):
        self.framebuf.fill_rect(x, y, w, h, col)

    def blit(self, fbuf, x, y):
        self.framebuf.blit(fbuf, x, y)


class SSD1306_I2C(SSD1306):
    def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False):
        self.i2c = i2c
        self.addr = addr
        self.temp = bytearray(2)
        super().__init__(width, height, external_vcc)

    def write_cmd(self, cmd):
        self.temp[0] = 0x80  # Co=1, D/C#=0
        self.temp[1] = cmd
        # IF SYS  :
        global currentBoard
        if currentBoard == "esp8266" or currentBoard == "esp32":
            self.i2c.writeto(self.addr, self.temp)
        elif currentBoard == "pyboard":
            self.i2c.send(self.temp, self.addr)
        # ELSE:

    def write_data(self, buf):
        self.temp[0] = self.addr << 1
        self.temp[1] = 0x40  # Co=0, D/C#=1
        global currentBoard
        if currentBoard == "esp8266" or currentBoard == "esp32":
            self.i2c.start()
            self.i2c.write(self.temp)
            self.i2c.write(buf)
            self.i2c.stop()
        elif currentBoard == "pyboard":
            # self.i2c.send(self.temp,self.addr)
            # self.i2c.send(buf,self.addr)
            self.i2c.mem_write(buf, self.addr, 0x40)

    def poweron(self):
        pass


class SSD1306_SPI(SSD1306):
    def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):
        self.rate = 10 * 1024 * 1024
        dc.init(dc.OUT, value=0)
        res.init(res.OUT, value=0)
        cs.init(cs.OUT, value=1)
        self.spi = spi
        self.dc = dc
        self.res = res
        self.cs = cs
        super().__init__(width, height, external_vcc)

    def write_cmd(self, cmd):
        global currentBoard
        if currentBoard == "esp8266" or currentBoard == "esp32":
            self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        elif currentBoard == "pyboard":
            self.spi.init(mode=pyb.SPI.MASTER,
                          baudrate=self.rate, polarity=0, phase=0)
        self.cs.high()
        self.dc.low()
        self.cs.low()
        global currentBoard
        if currentBoard == "esp8266" or currentBoard == "esp32":
            self.spi.write(bytearray([cmd]))
        elif currentBoard == "pyboard":
            self.spi.send(bytearray([cmd]))
        self.cs.high()

    def write_data(self, buf):
        global currentBoard
        if currentBoard == "esp8266" or currentBoard == "esp32":
            self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        elif currentBoard == "pyboard":
            self.spi.init(mode=pyb.SPI.MASTER,
                          baudrate=self.rate, polarity=0, phase=0)
        self.cs.high()
        self.dc.high()
        self.cs.low()
        global currentBoard
        if currentBoard == "esp8266" or currentBoard == "esp32":
            self.spi.write(buf)
        elif currentBoard == "pyboard":
            self.spi.send(buf)
        self.cs.high()

    def poweron(self):
        self.res.high()
        time.sleep_ms(1)
        self.res.low()
        time.sleep_ms(10)
        self.res.high()
