use std::{fs::File, io::{BufWriter, Write}};

use crate::ppm_writer::PPMWriter;

/*
* [3]
*/
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Vec3 {
    pub x: f32,
    pub y: f32,
    pub z: f32,
}
pub type Point = Vec3;
pub type Color = Vec3;

/*
fn: P(t) = t*b
*/
#[derive(Debug)]
pub struct Ray {
    pub point: Point,
    pub direction: Vec3,
}

pub struct HitRecord {
    pub t: f32,
    // pub p: Vec3,
    pub normal: Vec3,
    pub front_face: bool,
}

pub struct Camera<'a> {
    pub image_width: i32,
    pub image_height: i32,
    pub aspect_ratio: f32,
    pub viewport_width: f32,
    pub viewport_height: f32,
    pub camera_center: Point,
    pub focal_length: Vec3,
    pub viewport_u: Vec3,
    pub viewport_v: Vec3,
    pub viewport_u_delta: Vec3,
    pub viewport_v_delta: Vec3,
    pub viewport_top_left_pixel_center: Vec3,

    // sample times
    pub sample_times: i8,
    pub reflect_depth: i8,

    // writer
    pub ppm_file_writer: &'a mut PPMWriter<BufWriter<File>>
}

/*
/////////////
// for test
/////////////
*/
pub struct Sphere {
    pub center: Point,
    pub radius: f32,
}