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//! Provides a Rust wrapper around Cuda's device.

use super::api::{Driver, DriverFFI};
use crate::hardware::{HardwareType, IHardware};
use byteorder::{LittleEndian, ReadBytesExt};
use std::io::Cursor;

#[derive(Debug, Clone)]
/// Defines a Cuda Device.
///
/// [hardware]: ../../hardware/index.html
pub struct Device {
    id: isize,
    name: Option<String>,
    device_type: Option<HardwareType>,
    compute_units: Option<isize>,
}

impl Default for Device {
    fn default() -> Self {
        Device {
            id: -1,
            name: None,
            device_type: None,
            compute_units: None,
        }
    }
}

impl Device {
    /// Initializes a new Cuda device.
    pub fn from_isize(id: isize) -> Device {
        Device {
            id,
            ..Device::default()
        }
    }

    /// Initializes a new Cuda device from its C type.
    pub fn from_c(id: DriverFFI::CUdevice) -> Device {
        Device {
            id: id as isize,
            ..Device::default()
        }
    }

    /// Returns the id as its C type.
    pub fn id_c(&self) -> DriverFFI::CUdevice {
        self.id as DriverFFI::CUdevice
    }

    /// Loads the name of the device via a foreign Cuda call.
    pub fn load_name(&mut self) -> Self {
        self.name =
            match Driver::load_device_info(self, DriverFFI::CUdevice_attribute::CU_DEVICE_NAME) {
                Ok(result) => Some(result.to_string()),
                Err(_) => None,
            };
        self.clone()
    }

    /// Loads the device type via a foreign Cuda call.
    pub fn load_device_type(&mut self) -> Self {
        self.device_type = Some(HardwareType::GPU);
        self.clone()
    }

    /// Loads the compute units of the device via a foreign Cuda call.
    pub fn load_compute_units(&mut self) -> Self {
        self.compute_units = match Driver::load_device_info(
            self,
            DriverFFI::CUdevice_attribute::CU_DEVICE_ATTRIBUTE_MULTIPROCESSOR_COUNT,
        ) {
            Ok(result) => Some(result.to_isize()),
            Err(_) => None,
        };
        self.clone()
    }
}

impl IHardware for Device {
    fn id(&self) -> isize {
        self.id
    }

    fn name(&self) -> Option<String> {
        self.name.clone()
    }

    fn set_name(&mut self, name: Option<String>) -> Self {
        self.name = name;
        self.clone()
    }

    fn hardware_type(&self) -> Option<HardwareType> {
        self.device_type
    }

    fn set_hardware_type(&mut self, hardware_type: Option<HardwareType>) -> Self {
        self.device_type = hardware_type;
        self.clone()
    }

    fn compute_units(&self) -> Option<isize> {
        self.compute_units
    }

    fn set_compute_units(&mut self, compute_units: Option<isize>) -> Self {
        self.compute_units = compute_units;
        self.clone()
    }

    #[allow(missing_docs)]
    fn build(self) -> Device {
        Device {
            id: self.id(),
            name: self.name(),
            device_type: self.hardware_type(),
            compute_units: self.compute_units(),
        }
    }
}

impl PartialEq for Device {
    fn eq(&self, other: &Self) -> bool {
        self.id() == other.id()
    }
}

#[derive(Debug, Clone)]
/// Defines a generic DeviceInfo container.
///
/// Can be used to transform the info to different outputs.
pub struct DeviceInfo {
    info: Vec<u8>,
}

impl std::fmt::Display for DeviceInfo {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let msg = match String::from_utf8((*self.info).to_owned()) {
            Ok(res) => res,
            Err(e) => {
                format!("Failed to parse DeviceInfo: {}", e.to_string())
            }
        };
        write!(f, "{}", msg)
    }
}

impl DeviceInfo {
    /// Initializes a new Device Info
    pub fn new(info: Vec<u8>) -> DeviceInfo {
        DeviceInfo { info }
    }

    #[allow(missing_docs)]
    pub fn to_isize(&self) -> isize {
        let mut bytes = Cursor::new(&self.info);
        bytes.read_u32::<LittleEndian>().unwrap() as isize
    }
}