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use crate::asm;

pub struct MicroBenchState {
    sum: u64,
    count: u64,
}

impl MicroBenchState {
    #[inline(always)]
    pub const fn new() -> Self {
        Self { sum: 0, count: 0 }
    }
}

impl Default for MicroBenchState {
    #[inline(always)]
    fn default() -> Self {
        Self::new()
    }
}

pub unsafe trait MicroBenchConfig {
    const PRINT_INTERVAL: u64;
    const TIMESTAMP_FUNC: fn() -> u64;
}

#[cfg(feature = "precise_microbench")]
pub const DEFAULT_TIMESTAMP_FUNC: fn() -> u64 = asm::rdtsc_precise;
#[cfg(not(feature = "precise_microbench"))]
pub const DEFAULT_TIMESTAMP_FUNC: fn() -> u64 = asm::rdtsc_arch;

pub const DEFAULT_PRINT_INTERVAL: u64 = 100_000;

#[derive(Debug, Hash, PartialEq, Eq, PartialOrd, Ord, Copy, Clone)]
pub struct DefaultMicroBenchConfig {}
unsafe impl MicroBenchConfig for DefaultMicroBenchConfig {
    const PRINT_INTERVAL: u64 = DEFAULT_PRINT_INTERVAL;
    const TIMESTAMP_FUNC: fn() -> u64 = DEFAULT_TIMESTAMP_FUNC;
}

pub struct MicroBenchImpl<Config: MicroBenchConfig> {
    state: &'static mut MicroBenchState,
    msg: &'static str,
    line: u32,
    _typeholder: ::core::marker::PhantomData<Config>,
    start_at: u64,
}

impl<Config: MicroBenchConfig> MicroBenchImpl<Config> {
    #[inline(always)]
    pub fn new(state: &'static mut MicroBenchState, msg: &'static str, line: u32) -> Self {
        Self {
            state,
            msg,
            line,
            _typeholder: ::core::marker::PhantomData {},
            start_at: Config::TIMESTAMP_FUNC(),
        }
    }
}

impl<Config: MicroBenchConfig> Drop for MicroBenchImpl<Config> {
    #[inline(always)]
    fn drop(&mut self) {
        let diff = Config::TIMESTAMP_FUNC().wrapping_sub(self.start_at);
        self.state.sum = self.state.sum.wrapping_add(diff);
        self.state.count = self.state.count.wrapping_add(1);

        if self.state.count == Config::PRINT_INTERVAL {
            if self.line != 0 {
                println!(
                    "Avg cycle: {} at {}:{}",
                    self.state.sum as f64 / Config::PRINT_INTERVAL as f64,
                    self.msg,
                    self.line
                );
            } else {
                println!(
                    "Avg cycle: {} at {}",
                    self.state.sum as f64 / Config::PRINT_INTERVAL as f64,
                    self.msg
                );
            }
            *self.state = MicroBenchState { count: 0, sum: 0 };
        }
    }
}

#[macro_export]
macro_rules! DO_MICROBENCH {
    () => {
        let __microbench;
        unsafe {
            static mut __benchmark_state: $crate::microbench::MicroBenchState =
                $crate::microbench::MicroBenchState::new();
            __microbench = $crate::microbench::MicroBenchImpl::<
                $crate::microbench::DefaultMicroBenchConfig,
            >::new(&mut __benchmark_state, file!(), line!());
        }
    };
    ($name: expr) => {
        DO_MICROBENCH!($name, $crate::microbench::DEFAULT_PRINT_INTERVAL);
    };
    ($name: expr, $interval: expr) => {
        DO_MICROBENCH!($name, $interval, $crate::microbench::DEFAULT_TIMESTAMP_FUNC);
    };
    ($name: expr, $interval: expr, $timestamp: expr) => {
        let __microbench;
        unsafe {
            static mut __benchmark_state: $crate::microbench::MicroBenchState =
                $crate::microbench::MicroBenchState::new();
            struct __temp_config {}
            unsafe impl $crate::microbench::MicroBenchConfig for __temp_config {
                const PRINT_INTERVAL: u64 = $interval;
                const TIMESTAMP_FUNC: fn() -> u64 = $timestamp;
            }
            __microbench = $crate::microbench::MicroBenchImpl::<__temp_config>::new(
                &mut __benchmark_state,
                $name,
                0,
            );
        }
    };
}

#[macro_export]
macro_rules! DO_MICROBENCH_WITH_NAME {
    ($name: expr) => {
        DO_MICROBENCH!($name);
    };
}

#[macro_export]
macro_rules! DO_MICROBENCH_WITH_NAME_INTERVAL {
    ($name: expr, $interval: expr) => {
        DO_MICROBENCH!($name, $interval);
    };
}