use crate::macros::wrap_functions;
use crate::{
    containers::ByteSlice,
    macros::{wrap_clone, wrap_free, wrap_methods},
    mem::{heap_move_nonnull, heap_move_ok, heap_move_some, heap_remove},
};
use servicepoint::{
    Cp437Grid, Cp437GridCommand, DataRef, Grid, Origin, Packet,
};
use std::ptr::NonNull;

wrap_functions!(sp_cp437_grid;

    /// Creates a new [Cp437Grid] with the specified dimensions.
    ///
    /// returns: [Cp437Grid] initialized to 0.
    fn new(
        width: usize,
        height: usize,
    ) -> NonNull<Cp437Grid> {
        heap_move_nonnull(Cp437Grid::new(width, height))
    }

    /// Loads a [Cp437Grid] with the specified dimensions from the provided data.
    fn load(
        width: usize,
        height: usize,
        data: ByteSlice,
    ) -> *mut Cp437Grid {
        let data = unsafe { data.as_slice() };
        heap_move_some(Cp437Grid::load(width, height, data))
    }

    /// Creates a [Cp437GridCommand] and immediately turns that into a [Packet].
    ///
    /// The provided [Cp437Grid] gets consumed.
    ///
    /// Returns NULL in case of an error.
    fn into_packet(
        grid: NonNull<Cp437Grid>,
        x: usize,
        y: usize,
    ) -> *mut Packet {
        let grid = unsafe { heap_remove(grid) };
        heap_move_ok(Packet::try_from(Cp437GridCommand {
            grid,
            origin: Origin::new(x, y),
        }))
    }

);

wrap_clone!(sp_cp437_grid::Cp437Grid);
wrap_free!(sp_cp437_grid::Cp437Grid);

wrap_methods!(
    sp_cp437_grid::Cp437Grid;
    /// Gets the current value at the specified position.
    ///
    /// # Arguments
    ///
    /// - `x` and `y`: position of the cell to read
    ///
    /// # Panics
    ///
    /// - when accessing `x` or `y` out of bounds
    ref fn get(x: usize, y: usize) -> u8;

    /// Sets the value at the specified position.
    ///
    /// # Arguments
    ///
    /// - `x` and `y`: position of the cell
    /// - `value`: the value to write to the cell
    ///
    /// returns: old value of the cell
    ///
    /// # Panics
    ///
    /// - when accessing `x` or `y` out of bounds
    mut fn set(x: usize, y: usize, value: u8);

    /// Sets the value of all cells in the grid.
    ///
    /// # Arguments
    ///
    /// - `cp437_grid`: instance to write to
    /// - `value`: the value to set all cells to
    mut fn fill(value: u8);

    /// Gets the width of the grid.
    ref fn width() -> usize;

    /// Gets the height of the grid.
    ref fn height() -> usize;

    /// Gets an unsafe reference to the data of the grid.
    ///
    /// The returned memory is valid for the lifetime of the instance.
    mut fn data_ref_mut() -> ByteSlice {
        return(slice) { unsafe { ByteSlice::from_slice(slice) } };
    };
);