use crate::{analog::adc::Attenuation, peripherals::EFUSE};

#[cfg_attr(not(feature = "unstable"), allow(dead_code))]
mod fields;
#[instability::unstable]
pub use fields::*;

/// Selects which ADC we are interested in the efuse calibration data for
#[instability::unstable]
pub enum AdcCalibUnit {
    /// Select efuse calibration data for ADC1
    ADC1,
    /// Select efuse calibration data for ADC2
    ADC2,
}

/// Get status of SPI boot encryption.
#[instability::unstable]
pub fn flash_encryption() -> bool {
    !super::read_field_le::<u8>(SPI_BOOT_CRYPT_CNT)
        .count_ones()
        .is_multiple_of(2)
}

/// Get the multiplier for the timeout value of the RWDT STAGE 0 register.
#[instability::unstable]
pub fn rwdt_multiplier() -> u8 {
    super::read_field_le::<u8>(WDT_DELAY_SEL)
}

/// Get efuse block version
///
/// see <https://github.com/espressif/esp-idf/blob/dc016f5987/components/hal/efuse_hal.c#L27-L30>
#[instability::unstable]
pub fn block_version() -> (u8, u8) {
    // see <https://github.com/espressif/esp-idf/blob/dc016f5987/components/hal/esp32c3/include/hal/efuse_ll.h#L70-L78>
    // <https://github.com/espressif/esp-idf/blob/903af13e8/components/efuse/esp32c3/esp_efuse_table.csv#L163>
    // <https://github.com/espressif/esp-idf/blob/903af13e8/components/efuse/esp32c3/esp_efuse_table.csv#L173>
    (
        super::read_field_le::<u8>(BLK_VERSION_MAJOR),
        super::read_field_le::<u8>(BLK_VERSION_MINOR),
    )
}

/// Get version of RTC calibration block
///
/// see <https://github.com/espressif/esp-idf/blob/903af13e8/components/efuse/esp32c3/esp_efuse_rtc_calib.c#L12>
#[instability::unstable]
pub fn rtc_calib_version() -> u8 {
    let (major, _minor) = block_version();
    if major == 1 { 1 } else { 0 }
}

/// Get ADC initial code for specified attenuation from efuse
///
/// see <https://github.com/espressif/esp-idf/blob/903af13e8/components/efuse/esp32c3/esp_efuse_rtc_calib.c#L25>
#[instability::unstable]
pub fn rtc_calib_init_code(_unit: AdcCalibUnit, atten: Attenuation) -> Option<u16> {
    let version = rtc_calib_version();

    if version != 1 {
        return None;
    }

    // See <https://github.com/espressif/esp-idf/blob/903af13e8/components/efuse/esp32c3/esp_efuse_table.csv#L176-L179>
    let init_code: u16 = super::read_field_le(match atten {
        Attenuation::_0dB => ADC1_INIT_CODE_ATTEN0,
        Attenuation::_2p5dB => ADC1_INIT_CODE_ATTEN1,
        Attenuation::_6dB => ADC1_INIT_CODE_ATTEN2,
        Attenuation::_11dB => ADC1_INIT_CODE_ATTEN3,
    });

    Some(init_code + 1000) // version 1 logic
}

/// Get ADC reference point voltage for specified attenuation in millivolts
///
/// see <https://github.com/espressif/esp-idf/blob/903af13e8/components/efuse/esp32c3/esp_efuse_rtc_calib.c#L49>
#[instability::unstable]
pub fn rtc_calib_cal_mv(_unit: AdcCalibUnit, atten: Attenuation) -> u16 {
    match atten {
        Attenuation::_0dB => 400,
        Attenuation::_2p5dB => 550,
        Attenuation::_6dB => 750,
        Attenuation::_11dB => 1370,
    }
}

/// Get ADC reference point digital code for specified attenuation
///
/// see <https://github.com/espressif/esp-idf/blob/903af13e8/components/efuse/esp32c3/esp_efuse_rtc_calib.c#L49>
#[instability::unstable]
pub fn rtc_calib_cal_code(_unit: AdcCalibUnit, atten: Attenuation) -> Option<u16> {
    let version = rtc_calib_version();

    if version != 1 {
        return None;
    }

    // See <https://github.com/espressif/esp-idf/blob/903af13e8/components/efuse/esp32c3/esp_efuse_table.csv#L180-L183>
    let cal_code: u16 = super::read_field_le(match atten {
        Attenuation::_0dB => ADC1_CAL_VOL_ATTEN0,
        Attenuation::_2p5dB => ADC1_CAL_VOL_ATTEN1,
        Attenuation::_6dB => ADC1_CAL_VOL_ATTEN2,
        Attenuation::_11dB => ADC1_CAL_VOL_ATTEN3,
    });

    let cal_code = if cal_code & (1 << 9) != 0 {
        2000 - (cal_code & !(1 << 9))
    } else {
        2000 + cal_code
    };

    Some(cal_code)
}

/// Returns the major hardware revision
#[instability::unstable]
pub fn major_chip_version() -> u8 {
    super::read_field_le(WAFER_VERSION_MAJOR)
}

/// Returns the minor hardware revision
#[instability::unstable]
pub fn minor_chip_version() -> u8 {
    super::read_field_le::<u8>(WAFER_VERSION_MINOR_HI) << 3
        | super::read_field_le::<u8>(WAFER_VERSION_MINOR_LO)
}

#[derive(Debug, Clone, Copy, strum::FromRepr)]
#[repr(u32)]
pub(crate) enum EfuseBlock {
    Block0,
    Block1,
    Block2,
    Block3,
    Block4,
    Block5,
    Block6,
    Block7,
    Block8,
    Block9,
    Block10,
}

impl EfuseBlock {
    pub(crate) fn address(self) -> *const u32 {
        let efuse = EFUSE::regs();
        match self {
            Self::Block0 => efuse.rd_wr_dis().as_ptr(),
            Self::Block1 => efuse.rd_mac_spi_sys_0().as_ptr(),
            Self::Block2 => efuse.rd_sys_part1_data0().as_ptr(),
            Self::Block3 => efuse.rd_usr_data0().as_ptr(),
            Self::Block4 => efuse.rd_key0_data0().as_ptr(),
            Self::Block5 => efuse.rd_key1_data0().as_ptr(),
            Self::Block6 => efuse.rd_key2_data0().as_ptr(),
            Self::Block7 => efuse.rd_key3_data0().as_ptr(),
            Self::Block8 => efuse.rd_key4_data0().as_ptr(),
            Self::Block9 => efuse.rd_key5_data0().as_ptr(),
            Self::Block10 => efuse.rd_sys_part2_data0().as_ptr(),
        }
    }
}
