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pub mod context;
pub mod function;
pub mod host;
pub mod meta;
pub mod nativizer;
pub mod object;
pub mod registry;
pub mod script;
pub mod struct_type;
pub mod transformer;
pub mod utils;

pub mod prelude {
    pub use crate::{
        context::*, function::*, host::*, nativizer::*, object::*, registry::*, script::*,
        struct_type::*, transformer::*, IntuicioStruct, IntuicioVersion, Visibility,
    };
    pub use crate::{
        define_function, define_native_struct, define_runtime_struct, function_signature,
    };
}

pub mod __internal {
    pub use memoffset::offset_of;
}

use crate::{registry::Registry, struct_type::Struct};
use serde::{Deserialize, Serialize};
use std::{cell::Cell, marker::PhantomData};

#[derive(
    Debug, Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize,
)]
pub enum Visibility {
    Private,
    Module,
    #[default]
    Public,
}

impl Visibility {
    pub fn is_visible(self, scope: Self) -> bool {
        self >= scope
    }

    pub fn is_public(&self) -> bool {
        *self == Visibility::Public
    }

    pub fn is_module(&self) -> bool {
        *self == Visibility::Module
    }

    pub fn is_private(&self) -> bool {
        *self == Visibility::Private
    }
}

pub trait IntuicioStruct {
    fn define_struct(registry: &Registry) -> Struct;
}

#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
#[repr(C)]
pub struct IntuicioVersion {
    major: usize,
    minor: usize,
    patch: usize,
}

impl IntuicioVersion {
    pub fn new(major: usize, minor: usize, patch: usize) -> Self {
        Self {
            major,
            minor,
            patch,
        }
    }

    pub fn major(&self) -> usize {
        self.major
    }

    pub fn minor(&self) -> usize {
        self.minor
    }

    pub fn patch(&self) -> usize {
        self.patch
    }

    pub fn is_compatible(&self, other: &Self) -> bool {
        self.major == other.major && self.minor == other.minor
    }
}

impl std::fmt::Display for IntuicioVersion {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}.{}.{}", self.major, self.minor, self.patch)
    }
}

impl std::fmt::Debug for IntuicioVersion {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("IntuicioVersion")
            .field("major", &self.major)
            .field("minor", &self.minor)
            .field("patch", &self.patch)
            .finish()
    }
}

#[macro_export]
macro_rules! crate_version {
    () => {{
        let major = env!("CARGO_PKG_VERSION_MAJOR", "0")
            .parse::<usize>()
            .unwrap();
        let minor = env!("CARGO_PKG_VERSION_MINOR", "0")
            .parse::<usize>()
            .unwrap();
        let patch = env!("CARGO_PKG_VERSION_PATCH", "0")
            .parse::<usize>()
            .unwrap();
        $crate::IntuicioVersion::new(major, minor, patch)
    }};
}

pub fn core_version() -> IntuicioVersion {
    crate_version!()
}

macro_rules! does_implement_trait {
    ($trait:path => $identifier:ident < $type:ident >) => {
        pub fn $identifier<$type>() -> bool {
            struct ImplementsTrait<'a, $type> {
                implements: &'a Cell<bool>,
                _marker: PhantomData<$type>,
            }

            #[allow(clippy::non_canonical_clone_impl)]
            impl<$type> Clone for ImplementsTrait<'_, $type> {
                fn clone(&self) -> Self {
                    self.implements.set(false);
                    ImplementsTrait {
                        implements: self.implements,
                        _marker: PhantomData,
                    }
                }
            }

            impl<$type: $trait> Copy for ImplementsTrait<'_, $type> {}

            let implements = Cell::new(true);
            let _ = [ImplementsTrait::<$type> {
                implements: &implements,
                _marker: PhantomData,
            }]
            .clone();
            implements.get()
        }
    };
}

does_implement_trait!(Send => is_send<T>);
does_implement_trait!(Sync => is_sync<T>);
does_implement_trait!(Copy => is_copy<T>);
does_implement_trait!(Clone => is_clone<T>);
does_implement_trait!(Sized => is_sized<T>);
does_implement_trait!(Unpin => is_unpin<T>);
does_implement_trait!(ToString => is_to_string<T>);

#[cfg(test)]
mod tests {
    use crate::Visibility;

    #[test]
    fn test_visibility() {
        assert_eq!(Visibility::Private.is_visible(Visibility::Private), true);
        assert_eq!(Visibility::Private.is_visible(Visibility::Module), false);
        assert_eq!(Visibility::Private.is_visible(Visibility::Public), false);
        assert_eq!(Visibility::Module.is_visible(Visibility::Private), true);
        assert_eq!(Visibility::Module.is_visible(Visibility::Module), true);
        assert_eq!(Visibility::Module.is_visible(Visibility::Public), false);
        assert_eq!(Visibility::Public.is_visible(Visibility::Private), true);
        assert_eq!(Visibility::Public.is_visible(Visibility::Module), true);
        assert_eq!(Visibility::Public.is_visible(Visibility::Public), true);
    }
}