/// All possible errors in this crate
#[derive(Debug)]
pub enum Error<E> {
    /// I²C bus error
    I2C(E),
    /// Invalid setting for the current configuration
    InvalidSetting,
    /// Error occured during self-test
    SelfTestError,
}

/// Measurement resolution
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Resolution {
    /// 8-bit resolution.
    Low,
    /// 12-bit/14-bit resolution.
    High,
}

/// KXCJ9-1008 G scale (up to +/-8g)
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum GScale8 {
    /// Range: +/-2g
    G2,
    /// Range: +/-4g
    G4,
    /// Range: +/-8g
    G8,
    /// Range: +/-8g Full Power (selects 14-bit resolution)
    G8FP,
}

/// KXCJ9-1018 G scale (up to +/-16g)
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum GScale16 {
    /// Range: +/-4g
    G4,
    /// Range: +/-8g
    G8,
    /// Range: +/-16g
    G16,
    /// Range: +/-16g Full Power (selects 14-bit resolution)
    G16FP,
}

/// Output data rate
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum OutputDataRate {
    /// 0.781 Hz
    Hz0_781,
    /// 1.563 Hz
    Hz1_563,
    /// 3.125 Hz
    Hz3_125,
    /// 6.25 Hz
    Hz6_25,
    /// 12.5 Hz
    Hz12_5,
    /// 25 Hz
    Hz25,
    /// 50 Hz (default)
    Hz50,
    /// 100 Hz
    Hz100,
    /// 200 Hz
    Hz200,
    /// 400 Hz (Forces device into full power mode)
    Hz400,
    /// 800 Hz (Forces device into full power mode)
    Hz800,
    /// 1600 Hz (Forces device into full power mode)
    Hz1600,
}

/// Acceleration measurement scaled to configured G range
#[derive(Debug, Default, Clone)]
pub struct Measurement {
    /// X-axis acceleration.
    pub x: f32,
    /// Y-axis acceleration.
    pub y: f32,
    /// Z-axis acceleration.
    pub z: f32,
}

/// Unscaled acceleration measurement
#[derive(Debug, Default, Clone, PartialEq)]
pub struct UnscaledMeasurement {
    /// X-axis acceleration.
    pub x: i16,
    /// Y-axis acceleration.
    pub y: i16,
    /// Z-axis acceleration.
    pub z: i16,
}

/// Interrupt source information
#[derive(Debug, Default, Clone, PartialEq)]
pub struct InterruptInfo {
    /// New acceleration data is available
    pub data_ready: bool,
    /// Wake-up motion detected
    pub wake_up: bool,
    /// Wake-up X-axis negative direction motion detected
    pub wake_up_x_negative: bool,
    /// Wake-up X-axis positive direction motion detected
    pub wake_up_x_positive: bool,
    /// Wake-up Y-axis negative direction motion detected
    pub wake_up_y_negative: bool,
    /// Wake-up Y-axis positive direction motion detected
    pub wake_up_y_positive: bool,
    /// Wake-up Z-axis negative direction motion detected
    pub wake_up_z_negative: bool,
    /// Wake-up Z-axis positive direction motion detected
    pub wake_up_z_positive: bool,
}

/// Wake-up interrupt configuration
#[derive(Debug, Clone, Copy)]
pub struct WakeUpInterruptConfig {
    /// Motion that triggers the wake-up interrupt.
    pub trigger_motion: WakeUpTriggerMotion,
    /// Data rate used for checking on the wake-up motion.
    pub data_rate: WakeUpOutputDataRate,
    /// Number of faults necessary to trigger a wake-up interrupt.
    ///
    /// Each count accounts for a delay of `1/data_rate`.
    /// The minimum value is 1. Configuring with `fault_count = 0`
    /// will return an `Error::InvalidSetting`.
    pub fault_count: u8,
    /// Wake-up acceleration change threshold in G.
    ///
    /// This will be scaled internally and has a maximum of 8g for
    /// the KXCJ9-1008 and KCXJB devices and 16g for the KXCJ9-1018 device.
    /// This value must be positive and the comparison is done
    /// for each axis separately (including negative axes)
    pub threshold: f32,
}

impl Default for WakeUpInterruptConfig {
    fn default() -> Self {
        WakeUpInterruptConfig {
            trigger_motion: WakeUpTriggerMotion::default(),
            data_rate: WakeUpOutputDataRate::default(),
            fault_count: 1,
            threshold: 0.5,
        }
    }
}

/// Wake-up interrupt trigger motion
#[derive(Debug, Clone, Copy)]
pub struct WakeUpTriggerMotion {
    /// Enable wake-up interrupt on X-axis negative direction motion detected
    pub x_negative: bool,
    /// Enable wake-up interrupt on X-axis positive direction motion detected
    pub x_positive: bool,
    /// Enable wake-up interrupt on Y-axis negative direction motion detected
    pub y_negative: bool,
    /// Enable wake-up interrupt on Y-axis positive direction motion detected
    pub y_positive: bool,
    /// Enable wake-up interrupt on Z-axis negative direction motion detected
    pub z_negative: bool,
    /// Enable wake-up interrupt on Z-axis positive direction motion detected
    pub z_positive: bool,
}

impl Default for WakeUpTriggerMotion {
    fn default() -> Self {
        WakeUpTriggerMotion {
            x_negative: true,
            x_positive: true,
            y_negative: true,
            y_positive: true,
            z_negative: true,
            z_positive: true,
        }
    }
}

/// Output data rate for wake-up motion detection
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum WakeUpOutputDataRate {
    /// 0.781 Hz (default)
    Hz0_781,
    /// 1.563 Hz
    Hz1_563,
    /// 3.125 Hz
    Hz3_125,
    /// 6.25 Hz
    Hz6_25,
    /// 12.5 Hz
    Hz12_5,
    /// 25 Hz
    Hz25,
    /// 50 Hz
    Hz50,
    /// 100 Hz
    Hz100,
}

impl Default for WakeUpOutputDataRate {
    fn default() -> Self {
        WakeUpOutputDataRate::Hz0_781
    }
}

/// Physical interrupt pin polarity
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum InterruptPinPolarity {
    /// Low state when active
    ActiveLow,
    /// High state when active (default)
    ActiveHigh,
}

/// Physical interrupt pin latching behavior
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum InterruptPinLatching {
    /// Interrupt pin will transmit a single pulse with a period
    /// of `0.03ms - 0.05ms` when triggered.
    NonLatching,
    /// Interrupt pin stays active until cleared with `clear_interrupts()`. (default)
    Latching,
}

/// Possible slave addresses
#[derive(Debug, Clone, Copy)]
pub enum SlaveAddr {
    /// Default slave address
    Default,
    /// Alternative slave address providing bit value for A0
    Alternative(bool),
}

impl Default for SlaveAddr {
    /// Default slave address
    fn default() -> Self {
        SlaveAddr::Default
    }
}

impl SlaveAddr {
    pub(crate) fn addr(self, default: u8) -> u8 {
        match self {
            SlaveAddr::Default => default,
            SlaveAddr::Alternative(a0) => default | a0 as u8,
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use DEVICE_BASE_ADDRESS as BASE_ADDR;

    #[test]
    fn can_get_default_address() {
        let addr = SlaveAddr::default();
        assert_eq!(BASE_ADDR, addr.addr(BASE_ADDR));
    }

    #[test]
    fn can_generate_alternative_addresses() {
        assert_eq!(0b000_1110, SlaveAddr::Alternative(false).addr(BASE_ADDR));
        assert_eq!(0b000_1111, SlaveAddr::Alternative(true).addr(BASE_ADDR));
    }
}