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use criterion::measurement::{Measurement, ValueFormatter};
use criterion::Throughput;

pub struct CyclesPerByte;

fn rdtsc() -> u64 {
    #[cfg(target_arch = "x86_64")]
    unsafe {
        core::arch::x86_64::_rdtsc()
    }

    #[cfg(target_arch = "x86")]
    unsafe {
        core::arch::x86::_rdtsc()
    }
}


impl Measurement for CyclesPerByte {
    type Intermediate = u64;
    type Value = u64;

    fn start(&self) -> Self::Intermediate {
        rdtsc()
    }

    fn end(&self, i: Self::Intermediate) -> Self::Value {
        rdtsc() - i
    }

    fn add(&self, v1: &Self::Value, v2: &Self::Value) -> Self::Value {
        v1 + v2
    }

    fn zero(&self) -> Self::Value {
        0
    }

    fn to_f64(&self, value: &Self::Value) -> f64 {
        *value as f64
    }

    fn formatter(&self) -> &dyn ValueFormatter {
        &CyclesPerByteFormatter
    }
}

struct CyclesPerByteFormatter;

impl ValueFormatter for CyclesPerByteFormatter {
    fn format_value(&self, value: f64) -> String {
        format!("{:.4} cycles", value)
    }

    fn format_throughput(&self, throughput: &Throughput, value: f64) -> String {
        match throughput {
            Throughput::Bytes(b) => format!("{:.4} cpb", value / *b as f64),
            Throughput::Elements(b) => format!("{:.4} cycles/{}", value, b),
        }
    }

    fn scale_values(&self, _typical_value: f64, _values: &mut [f64]) -> &'static str {
        "cycles"
    }

    fn scale_throughputs(
        &self,
        _typical_value: f64,
        throughput: &Throughput,
        values: &mut [f64],
    ) -> &'static str {
        match throughput {
            Throughput::Bytes(n) => {
                for val in values {
                    *val /= *n as f64;
                }
                "cpb"
            }
            Throughput::Elements(n) => {
                for val in values {
                    *val /= *n as f64;
                }
                "c/e"
            }
        }
    }

    fn scale_for_machines(&self, _values: &mut [f64]) -> &'static str {
        "cycles"
    }
}