use integral_geometry::{Point, Size};

use land2d;

use landgen::{template_based::TemplatedLandGenerator, LandGenerationParameters, LandGenerator};

use lfprng::LaggedFibonacciPRNG;

use mapgen::{theme::Theme, MapGenerator};

use std::fs;

use std::{ffi::CStr, path::Path};

#[repr(C)]

pub struct GameField {

    collision: land2d::Land2D<u16>,

    pixels: land2d::Land2D<u32>,

}

#[no_mangle]

pub extern "C" fn get_game_field_parameters(

    game_field: &GameField,

    width: *mut i32,

    height: *mut i32,

) {

    unsafe {

        *width = game_field.collision.width() as i32;

        *height = game_field.collision.height() as i32;

    }

}

#[no_mangle]

pub extern "C" fn create_empty_game_field(width: u32, height: u32) -> *mut GameField {

    let game_field = Box::new(GameField {

    });

    Box::leak(game_field)

}

#[no_mangle]

pub extern "C" fn generate_templated_game_field(

    feature_size: u32,

    seed: *const i8,

    data_path: *const i8,

) -> *mut GameField {

    let data_path: &str = unsafe { CStr::from_ptr(data_path) }.to_str().unwrap();

    let data_path = Path::new(&data_path);

    let seed: &str = unsafe { CStr::from_ptr(seed) }.to_str().unwrap();

    let mut random_numbers_gen = LaggedFibonacciPRNG::new(seed.as_bytes());

    let yaml_templates =

        fs::read_to_string(data_path.join(Path::new("map_templates.yaml")).as_path())

            .expect("Error reading map templates file");

    let mut map_gen = MapGenerator::new();

    map_gen.import_yaml_templates(&yaml_templates);

    let distance_divisor = feature_size.pow(2) / 8 + 10;

    let params = LandGenerationParameters::new(0u16, 0x8000u16, distance_divisor, false, false);

    let template = map_gen

        .expect("Error reading map templates file")

        .clone();

    let landgen = TemplatedLandGenerator::new(template);

    let collision = landgen.generate_land(&params, &mut random_numbers_gen);

    let theme = Theme::load(

        data_path

            .join(Path::new("Themes"))

            .join(Path::new(theme_name))

            .as_path(),

    )

    .unwrap();

}

#[no_mangle]

pub extern "C" fn land_get(game_field: &mut GameField, x: i32, y: i32) -> u16 {

    game_field.collision.map(y, x, |p| *p)

}

#[no_mangle]

pub extern "C" fn land_set(game_field: &mut GameField, x: i32, y: i32, value: u16) {

    game_field.collision.map(y, x, |p| *p = value);

}

#[no_mangle]

pub extern "C" fn land_row(game_field: &mut GameField, row: i32) -> *mut u16 {

    game_field.collision[row as usize].as_mut_ptr()

}

#[no_mangle]

pub extern "C" fn land_fill(

    game_field: &mut GameField,

    x: i32,

    y: i32,

    border_value: u16,

    fill_value: u16,

) {

    game_field

        .collision

        .fill(Point::new(x, y), border_value, fill_value)

}

#[no_mangle]

pub extern "C" fn land_pixel_get(game_field: &mut GameField, x: i32, y: i32) -> u32 {

    game_field.pixels.map(y, x, |p| *p)

}

#[no_mangle]

pub extern "C" fn land_pixel_set(game_field: &mut GameField, x: i32, y: i32, value: u32) {

    game_field.pixels.map(y, x, |p| *p = value);

}

#[no_mangle]

pub extern "C" fn land_pixel_row(game_field: &mut GameField, row: i32) -> *mut u32 {

    game_field.pixels[row as usize].as_mut_ptr()

}

#[no_mangle]

pub extern "C" fn dispose_game_field(game_field: *mut GameField) {

    unsafe { drop(Box::from_raw(game_field)) };

}