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//! Load .crocotile maps into memory.
#![deny(missing_docs)]

extern crate base64;
extern crate failure;
extern crate serde;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;

mod map;

pub use map::*;

use failure::Error;
use std::fs::File;

/// Loads the supplied .crocotile file
///
/// Loads the supplied file, parses it, and returns a `MapData` containing
/// configuration and all the models within the map.
///
/// # Panics
/// No panics should occur with this library - if you find one, please raise a
/// GitHub issue for it.
///
/// # Errors
/// Errors are wrapped using the `failure` crate. If you need to interop with
/// code that doesn't presently use `failure`, wrap the errors in a `Compat`.
///
/// # Examples
///
/// Loading a file:
///
/// ```
/// use dot_crocotile::*;
///
/// let map = load("src/resources/green.crocotile").unwrap();
/// assert_eq!(16, map.config.tilesize_x);
/// assert_eq!(1, map.model.len());
/// ```
pub fn load(filename: &str) -> Result<MapData, Error> {
    let f = File::open(filename)?;
    let map: MapData = serde_json::from_reader(f)?;
    Ok(map)
}

/// Loads the supplied byte slice into a `MapData`.
///
/// Parses the supplied byte slice and returns a `MapData` containing
/// configuration and all the models within the map.
///
/// # Panics
/// No panics should occur with this library - if you find one, please raise a
/// GitHub issue for it.
///
/// # Errors
/// Errors are wrapped using the `failure` crate. If you need to interop with
/// code that doesn't presently use `failure`, wrap the errors in a `Compat`.
///
/// # Examples
///
/// Loading a byte slice:
///
/// ```
/// use dot_crocotile::*;
///
/// let bytes = include_bytes!("resources/green.crocotile").to_vec();
/// let map = load_from_bytes(&bytes).unwrap();
/// assert_eq!(16, map.config.tilesize_x);
/// assert_eq!(1, map.model.len());
/// ```
pub fn load_from_bytes(bytes: &[u8]) -> Result<MapData, Error> {
    let map: MapData = serde_json::from_slice(bytes)?;
    Ok(map)
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::io::ErrorKind;

    #[test]
    fn trying_to_load_a_missing_file_fails() {
        let error: Error =
            load("src/resources/file_not_found.crocotile").expect_err("Should have IO error here");
        let io_error: &std::io::Error = error.downcast_ref().expect("Incorrect error type");
        assert_eq!(ErrorKind::NotFound, io_error.kind());
    }

    #[test]
    fn trying_to_load_an_unparseable_file_fails() {
        let error: Error =
            load("src/resources/unparseable.crocotile").expect_err("Should have Parse error here");
        let serde_error: &serde_json::Error = error.downcast_ref().expect("Incorrect error type");
        assert!(serde_error.is_syntax());
    }

    #[test]
    fn trying_to_parse_a_valid_file_succeeds() {
        let actual = load("src/resources/green.crocotile").expect("Should successfully load");
        let expected_image = include_bytes!("resources/green.png").to_vec();
        assert_eq!(16, actual.config.tilesize_x);
        assert_eq!(16, actual.config.tilesize_y);
        assert_eq!(expected_image, actual.config.skybox.unwrap());
        assert_eq!(1, actual.model.len());

        let model = &actual.model[0];
        assert_eq!(expected_image, model.texture);
        assert_eq!(27, model.object.len());

        let object = &model.object[0];
        assert_eq!(-0.5, object.position.x);
        assert_eq!(0.5, object.position.y);
        assert_eq!(0.0, object.position.z);
        assert_eq!(4, object.vertices.len());
        assert_eq!(2, object.faces.len());
        assert_eq!(2, object.uvs.len());

        let vertice = &object.vertices[0];
        assert_eq!(-0.5, vertice.x);
        assert_eq!(-0.5, vertice.y);
        assert_eq!(0.0, vertice.z);

        let face = &object.faces[0];
        assert_eq!(0, face[0]);
        assert_eq!(2, face[1]);
        assert_eq!(1, face[2]);

        let uv = &object.uvs[0];
        assert_eq!(0.0, uv[0].x);
        assert_eq!(0.9375, uv[0].y);
        assert_eq!(0.0625, uv[1].x);
        assert_eq!(1.0, uv[1].y);
        assert_eq!(0.0, uv[2].x);
        assert_eq!(1.0, uv[2].y);
    }
}