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use crate::expect_args;
use crate::frame::FrameKind;
use crate::invokable::Invoke;
use crate::invokable::Return;
use crate::primitives::PrimitiveFn;
use crate::universe::Universe;
use crate::value::Value;

/// Primitives for the **Block** and **Block1** class.
pub mod block1 {
    use super::*;

    pub static INSTANCE_PRIMITIVES: &[(&str, PrimitiveFn, bool)] = &[
        ("value", self::value, true),
        ("restart", self::restart, false),
    ];
    pub static CLASS_PRIMITIVES: &[(&str, PrimitiveFn, bool)] = &[];

    fn value(universe: &mut Universe, args: Vec<Value>) -> Return {
        const SIGNATURE: &str = "Block1>>#value";

        let block_args = args.clone();
        expect_args!(SIGNATURE, args, [
            Value::Block(block) => block,
        ]);

        universe.with_frame(
            FrameKind::Block {
                block: block.clone(),
            },
            |universe| block.invoke(universe, block_args),
        )
    }

    fn restart(_: &mut Universe, args: Vec<Value>) -> Return {
        const SIGNATURE: &str = "Block>>#restart";

        expect_args!(SIGNATURE, args, [Value::Block(_)]);

        Return::Restart
    }

    /// Search for an instance primitive matching the given signature.
    pub fn get_instance_primitive(signature: &str) -> Option<PrimitiveFn> {
        INSTANCE_PRIMITIVES
            .iter()
            .find(|it| it.0 == signature)
            .map(|it| it.1)
    }

    /// Search for a class primitive matching the given signature.
    pub fn get_class_primitive(signature: &str) -> Option<PrimitiveFn> {
        CLASS_PRIMITIVES
            .iter()
            .find(|it| it.0 == signature)
            .map(|it| it.1)
    }
}

/// Primitives for the **Block2** class.
pub mod block2 {
    use super::*;

    pub static INSTANCE_PRIMITIVES: &[(&str, PrimitiveFn, bool)] = &[("value:", self::value, true)];
    pub static CLASS_PRIMITIVES: &[(&str, PrimitiveFn, bool)] = &[];

    fn value(universe: &mut Universe, args: Vec<Value>) -> Return {
        const SIGNATURE: &str = "Block2>>#value:";

        let block_args = args.clone();
        expect_args!(SIGNATURE, args, [
            Value::Block(block) => block,
            _,
        ]);

        universe.with_frame(
            FrameKind::Block {
                block: block.clone(),
            },
            |universe| block.invoke(universe, block_args),
        )
    }

    /// Search for an instance primitive matching the given signature.
    pub fn get_instance_primitive(signature: &str) -> Option<PrimitiveFn> {
        INSTANCE_PRIMITIVES
            .iter()
            .find(|it| it.0 == signature)
            .map(|it| it.1)
    }

    /// Search for a class primitive matching the given signature.
    pub fn get_class_primitive(signature: &str) -> Option<PrimitiveFn> {
        CLASS_PRIMITIVES
            .iter()
            .find(|it| it.0 == signature)
            .map(|it| it.1)
    }
}

/// Primitives for the **Block3** class.
pub mod block3 {
    use super::*;

    pub static INSTANCE_PRIMITIVES: &[(&str, PrimitiveFn, bool)] =
        &[("value:with:", self::value_with, true)];
    pub static CLASS_PRIMITIVES: &[(&str, PrimitiveFn, bool)] = &[];

    fn value_with(universe: &mut Universe, args: Vec<Value>) -> Return {
        const SIGNATURE: &str = "Block3>>#value:with:";

        let block_args = args.clone();
        expect_args!(SIGNATURE, args, [
            Value::Block(block) => block,
            _,
            _,
        ]);

        universe.with_frame(
            FrameKind::Block {
                block: block.clone(),
            },
            |universe| block.invoke(universe, block_args),
        )
    }

    /// Search for an instance primitive matching the given signature.
    pub fn get_instance_primitive(signature: &str) -> Option<PrimitiveFn> {
        INSTANCE_PRIMITIVES
            .iter()
            .find(|it| it.0 == signature)
            .map(|it| it.1)
    }

    /// Search for a class primitive matching the given signature.
    pub fn get_class_primitive(signature: &str) -> Option<PrimitiveFn> {
        CLASS_PRIMITIVES
            .iter()
            .find(|it| it.0 == signature)
            .map(|it| it.1)
    }
}