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use std::ops::RangeInclusive;
use std::hash::{Hash, Hasher};
use std::fmt::{Debug, Display, Formatter};

use osiris_data::data::identification::Identifier;

pub const REGISTERS_IN_BANK: usize = 65536;

#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd)]
pub struct RegisterId(u16);

impl RegisterId {
    pub const fn new(raw: u16) -> Self { Self(raw) }
    pub const fn to_u16(&self) -> u16 { self.0 }
}

impl Hash for RegisterId {
    fn hash<H: Hasher>(&self, state: &mut H) {
        state.write_usize(self.to_usize());
    }
}

impl Identifier for RegisterId {
    fn to_usize(&self) -> usize { self.0 as usize }
}

#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd)]
pub struct RegisterRange {
    pub start: RegisterId,
    pub end: RegisterId,
}

impl RegisterRange {
    pub fn new(start: RegisterId, end: RegisterId) -> Self {
        if end < start {
            panic!("End of a range cannot be lower to its start.")
        }
        Self { start, end }
    }

    pub fn from_u32(data: u32) -> Self {
        Self {
            start: RegisterId((data >> 16) as u16),
            end: RegisterId(data as u16),
        }
    }
    pub fn to_usize_range(&self) -> RangeInclusive<usize> { self.start.to_usize()..=self.end.to_usize() }
    pub fn to_u32(&self) -> u32 { (self.start.to_u16() as u32) << 16 | self.end.to_u16() as u32 }

    #[allow(clippy::len_without_is_empty)]
    pub fn len(&self) -> usize { self.end.to_usize() - self.start.to_usize() }
}

impl Display for RegisterRange {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "[{:04x}:{:04x}]", self.start.to_u16(), self.end.to_u16())
    }
}
#[derive(Copy, Clone, Debug)]
pub struct CpuConfiguration {
    /// Real frequency is `self.frequency x1.073741`
    pub frequency: usize,
}

impl CpuConfiguration {
    /// ~64.42 Hz
    pub const DEFAULT_FREQUENCY: usize = 60;
}

impl Default for CpuConfiguration {
    /// See : [CpuConfiguration::DEFAULT_FREQUENCY]
    fn default() -> Self {
        CpuConfiguration {
            frequency: Self::DEFAULT_FREQUENCY,
        }
    }
}

pub mod integral;
pub mod floating_point;
pub mod state;