export default class ESP32C3ROM {
  static CHIP_NAME = "ESP32-C3";
  static IMAGE_CHIP_ID = 5;
  static EFUSE_BASE = 0x60008800;
  static MAC_EFUSE_REG = this.EFUSE_BASE + 0x044;
  static UART_CLKDIV_REG = 0x3ff40014;
  static UART_CLKDIV_MASK = 0xfffff;
  static UART_DATE_REG_ADDR = 0x6000007c;

  static FLASH_WRITE_SIZE = 0x400;
  static BOOTLOADER_FLASH_OFFSET = 0x1000;

  static FLASH_SIZES = {
    "1MB": 0x00,
    "2MB": 0x10,
    "4MB": 0x20,
    "8MB": 0x30,
    "16MB": 0x40,
  };

  static SPI_REG_BASE = 0x60002000;
  static SPI_USR_OFFS = 0x18;
  static SPI_USR1_OFFS = 0x1c;
  static SPI_USR2_OFFS = 0x20;
  static SPI_MOSI_DLEN_OFFS = 0x24;
  static SPI_MISO_DLEN_OFFS = 0x28;
  static SPI_W0_OFFS = 0x58;

  static TEXT_START = 0x40380000;
  static ENTRY = 0x403805c8;
  static DATA_START = 0x3fc96ba8;
  static ROM_DATA = "DEDIPw==";
  static ROM_TEXT =
    "" +
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  static get_pkg_version = async (loader) => {
    var num_word = 3;
    var block1_addr = this.EFUSE_BASE + 0x044;
    var addr = block1_addr + 4 * num_word;
    var word3 = await loader.read_reg({ addr: addr });
    var pkg_version = (word3 >> 21) & 0x07;
    return pkg_version;
  };

  static get_chip_revision = async (loader) => {
    var block1_addr = this.EFUSE_BASE + 0x044;
    var num_word = 3;
    var pos = 18;
    var addr = block1_addr + 4 * num_word;
    var ret = ((await loader.read_reg({ addr: addr })) & (0x7 << pos)) >> pos;
    return ret;
  };

  static get_chip_description = async (loader) => {
    var desc;
    var pkg_ver = await this.get_pkg_version(loader);
    if (pkg_ver === 0) {
      desc = "ESP32-C3";
    } else {
      desc = "unknown ESP32-C3";
    }
    var chip_rev = await this.get_chip_revision(loader);
    desc += " (revision " + chip_rev + ")";
    return desc;
  };

  static get_chip_features = async (loader) => {
    return ["Wi-Fi"];
  };

  static get_crystal_freq = async (loader) => {
    return 40;
  };

  static _d2h(d) {
    var h = (+d).toString(16);
    return h.length === 1 ? "0" + h : h;
  }

  static read_mac = async (loader) => {
    var mac0 = await loader.read_reg({ addr: this.MAC_EFUSE_REG });
    mac0 = mac0 >>> 0;
    var mac1 = await loader.read_reg({ addr: this.MAC_EFUSE_REG + 4 });
    mac1 = (mac1 >>> 0) & 0x0000ffff;
    var mac = new Uint8Array(6);
    mac[0] = (mac1 >> 8) & 0xff;
    mac[1] = mac1 & 0xff;
    mac[2] = (mac0 >> 24) & 0xff;
    mac[3] = (mac0 >> 16) & 0xff;
    mac[4] = (mac0 >> 8) & 0xff;
    mac[5] = mac0 & 0xff;

    return (
      this._d2h(mac[0]) +
      ":" +
      this._d2h(mac[1]) +
      ":" +
      this._d2h(mac[2]) +
      ":" +
      this._d2h(mac[3]) +
      ":" +
      this._d2h(mac[4]) +
      ":" +
      this._d2h(mac[5])
    );
  };

  static get_erase_size = function (offset, size) {
    return size;
  };
}