const micro = @import("microzig");

const SCREEN_HEIGHT: u16 = 64;
const SCREEN_WIDTH: u16 = 128;
const SCREEN_SIZE: u16 = SCREEN_HEIGHT * SCREEN_WIDTH / @bitSizeOf(u8);

const I2C_ADDR = 0x3C;
const Command = enum(u8) {
    SET_LOW_COLUMN = 0x00,
    SET_HIGH_COLUMN = 0x10,
    MEMORY_MODE = 0x20,
    COLUMN_ADDR = 0x21,
    PAGE_ADDR = 0x22,
    SET_START_LINE = 0x40,
    DEFAULT_ADDRESS = 0x78,
    SET_CONTRAST = 0x81,
    CHARGE_PUMP = 0x8D,
    SEG_REMAP = 0xA0,
    DISPLAY_RESUME = 0xA4,
    DISPLAY_ALL_ON = 0xA5,
    NORMAL_DISPLAY = 0xA6,
    INVERT_DISPLAY = 0xA7,
    SET_MUX = 0xA8,
    DISPLAY_OFF = 0xAE,
    DISPLAY_ON = 0xAF,
    SET_PAGE = 0xB0,
    COM_SCAN_DIR = 0xC0,
    SET_DISPLAY_OFFSET = 0xD3,
    SET_DISPLAY_CLOCK_DIV = 0xD5,
    SET_PRECHARGE = 0xD9,
    SET_COM_PINS = 0xDA,
    SET_VCOM_DESELECT = 0xDB,

    SWITCH_CAP_VCC = 0x02,
    NOP = 0xE3,
};
pub const Config = struct {
    contrast: u8 = 127,
    display_start_line: u6 = 0,
    seg_remap: bool = false,
    mux_ratio: u6 = 63, // can't go lower than 15
    com_scan_dir: bool = 0,
    display_offset: u6 = 0,
    com_pin_config: bool = 1,
    com_left_right_remap: bool = false,
    display_clock_div_ratio: u4 = 0x0,
    oscillator_freq: u4 = 0xF,
    precharge_period_1: u4 = 0x2,
    precharge_period_2: u4 = 0x2,
    vcomh_deselect_level: u2 = 0b10, // can't be 0b01
};

pub const SSD1306 = struct {
    i2c: *micro.hal.i2c.I2C,
    pub fn init(self: *SSD1306, i2c_index: usize, pins: Pins, config: Config) SSD1306 {

    }
}

pub const I2CConfig = struct {
    index: ?u1 = 0,
    scl: ?type = null,
    sda: ?type = null,
};