// Take a look at the license at the top of the repository in the LICENSE file.

use crate::sys::cpu::{self, Cpu, Query};
use crate::CpuRefreshKind;

use std::mem::zeroed;

use winapi::um::sysinfoapi::{GetSystemInfo, SYSTEM_INFO};

pub(crate) struct KeyHandler {
    pub unique_id: String,
}

impl KeyHandler {
    pub fn new(unique_id: String) -> KeyHandler {
        KeyHandler { unique_id }
    }
}

pub(crate) fn init_cpus(refresh_kind: CpuRefreshKind) -> (Vec<Cpu>, String, String) {
    unsafe {
        let mut sys_info: SYSTEM_INFO = zeroed();
        GetSystemInfo(&mut sys_info);
        let (vendor_id, brand) = cpu::get_vendor_id_and_brand(&sys_info);
        let nb_cpus = sys_info.dwNumberOfProcessors as usize;
        let frequencies = if refresh_kind.frequency() {
            cpu::get_frequencies(nb_cpus)
        } else {
            vec![0; nb_cpus]
        };
        let mut ret = Vec::with_capacity(nb_cpus + 1);
        for (nb, frequency) in frequencies.iter().enumerate() {
            ret.push(Cpu::new_with_values(
                format!("CPU {}", nb + 1),
                vendor_id.clone(),
                brand.clone(),
                *frequency,
            ));
        }
        (ret, vendor_id, brand)
    }
}

pub(crate) fn add_english_counter(
    s: String,
    query: &mut Query,
    keys: &mut Option<KeyHandler>,
    counter_name: String,
) {
    let mut full = s.encode_utf16().collect::<Vec<_>>();
    full.push(0);
    if query.add_english_counter(&counter_name, full) {
        *keys = Some(KeyHandler::new(counter_name));
    }
}