/*
 * https://docs.espressif.com/projects/esp-idf/en/v5.3.2/esp32/api-reference/peripherals/lcd/index.html#functional-overview
 *
 * Implementing the interface draw to an LCD using various interface modes.
 * I2C interface mode is SSD1306
 * SPI interface mode is ST7789
 * I80 interface mode is NT35510 or ST7789
 *
 * Actually, I think any driver can be used with any interface mode
 * Along with additional third party drivers via the component manager
 * https://github.com/espressif/esp-idf/tree/0d6099ec533c4b647fb7a7b0b8942bc7aeb82f90/examples/peripherals/lcd/spi_lcd_touch#spi-lcd-and-touch-panel-example
 */

#ifndef SSD1306_H
#define SSD1306_H

#include <esp_lcd_panel_ssd1306.h>

#include "panel_device.h"

// According to SSD1306 datasheet
// https://www.digikey.com/en/products/detail/winstar-display/WEA012864DWPP3N00003/20533255
// Bit number used to represent command and parameter
#define SCREEN_WIDTH           128  // OLED display width, in pixels.
#define SCREEN_HEIGHT          64  // OLED display height, in pixels.
#define LCD_H_RES              SCREEN_WIDTH
#define LCD_V_RES              SCREEN_HEIGHT
#define I2C_HW_ADDR            0x3C
#define LCD_PIXEL_CLOCK_HZ     (400 * 1000)
#define LCD_CMD_BITS           8
#define LCD_PARAM_BITS         8

class SSD1306 : public IPanelDevice {
public:
  // Constructors allow overriding ssd1306 config.
  explicit SSD1306(I2C &i2c) :
      SSD1306(i2c, {.height = SCREEN_HEIGHT}) { }

  SSD1306(I2C &i2c,
          esp_lcd_panel_ssd1306_config_t config,
          int width = SCREEN_WIDTH,
          int height = SCREEN_HEIGHT
  );

  virtual ~SSD1306() = default;

  void *vendor_config() override
  {
    return &ssd1306_config_;
  }

  // The configuration structure specific to the SSD1306.
  esp_lcd_panel_ssd1306_config_t ssd1306_config_;

  // For LV_COLOR_FORMAT_I1 we need an extra buffer to hold the converted data.
  static uint8_t oled_buffer_[LCD_H_RES * LCD_V_RES / 8];

private:
  void init_panel(esp_lcd_panel_dev_config_t &config,
                  esp_lcd_panel_io_handle_t io,
                  esp_lcd_panel_handle_t &panel) override
  {
    ESP_ERROR_CHECK(esp_lcd_new_panel_ssd1306(io, &config, &panel));
  }
};

#endif // SSD1306_H