//! an Object Module for defining Objects
const SCR_WIDTH: u32 = 1600;
const SCR_HEIGHT: u32 = 900;

use cgmath::{Vector3, Quaternion, Rotation3, Deg, perspective, Matrix4};
use cgmath::prelude::*;
use crate::model::Model;
use crate::camera::Camera;
use glow::HasContext;

pub struct Input {
    pub Accel: bool,
    pub Decel: bool,
    pub Left: bool,
    pub Right: bool
}

impl Default for Input {
    fn default() -> Input {
        Input {
            Accel: false,
            Decel: false,
            Left: false,
            Right: false
        }
    }
}
pub struct Transform {
    pub Position: Vector3<f32>,
    pub Rotation: Quaternion<f32>,
    pub Velocity: Vector3<f32>,
    pub Scale: f32,
}

impl Default for Transform {
    fn default() -> Transform
        {
            Transform {
                Position: Vector3::<f32>::new(0.0, 0.0, 0.0),
                Rotation: Quaternion::from_angle_y(cgmath::Deg(0.0)),
                Velocity: Vector3::<f32>::new(0.0, 0.0, 0.0),
                Scale: 0.2,
            }

        }

}

impl Transform {
    pub fn setPos(&mut self, input: Vector3<f32>)
        {
            self.Position = input;
        }
}

pub struct Player {
    pub Transform: Transform,
    pub Model: Model
}

impl Player {
    pub fn new(gl: std::sync::Arc<glow::Context>) -> Self {
        Player {
            Transform: Transform::default(),
            Model: Model::new("resources/models/TestCarModel/CarW4.obj", gl),
        }
    }

    pub fn update(&mut self, input: &Input)
        {
            if input.Accel {
                self.forward(0.01);
            }
            if input.Decel {
                self.forward(-0.01)
            }

            if input.Left {
                self.turn(1.5)
            }
            if input.Right {
                self.turn(-1.5)
            }

            self.Transform.Position += self.Transform.Velocity;
            self.Transform.Rotation = self.Transform.Rotation.normalize();
        }
    pub fn forward(&mut self, amount: f32)
        {
            let forward = self.Transform.Rotation.rotate_vector(cgmath::Vector3::unit_z());
            let distance = forward * amount;
            self.Transform.Position += distance;

        }

    pub fn turn(&mut self, amount: f32)
        {
            let up = Vector3::<f32>::unit_y();
            let delta_rotation = Quaternion::from_axis_angle(up, cgmath::Deg(amount));
            self.Transform.Rotation = self.Transform.Rotation * delta_rotation;
        }
    pub fn Draw(&self, shader: &crate::shader::shader, camera: &Camera)
        {
            shader.Use();

            let translation = cgmath::Matrix4::from_translation(self.Transform.Position);
            let rotation = cgmath::Matrix4::from(self.Transform.Rotation);
            let scale = cgmath::Matrix4::from_scale(self.Transform.Scale);
            let model = translation * rotation * scale;

            let projection = cgmath::perspective(cgmath::Deg(camera.Zoom), SCR_WIDTH as f32 /SCR_HEIGHT as f32, 0.1, 100.0 );
            let view = camera.GetViewMatrix();
            shader.setMat4("projection", &projection);
            shader.setMat4("view", &view);

            shader.setMat4("model", &model);

            self.Model.Draw(shader);
        }
}

pub struct plane {
    pub texture: glow::NativeTexture,
    pub VAO: glow::VertexArray,

    VBO: glow::Buffer,
    EBO: glow::Buffer,
}

impl plane {
    pub fn new(gl: std::sync::Arc<glow::Context>) -> plane
    {
        let vertices: [f32; 20] = [
            10.5, 10.5, 0.0, 1.0, 1.0,
            10.5, -10.5, 0.0, 1.0, 0.0,
            -10.5, -10.5, 0.0, 0.0, 0.0,
            -10.5, 10.5, 0.0, 0.0, 1.0
        ];
        let indices: [u32; 6] = [
            0, 1, 3,
            1, 2, 3
        ];
        unsafe {
            let VAO = gl.create_vertex_array().unwrap();
            let VBO = gl.create_buffer().unwrap();
            let EBO = gl.create_buffer().unwrap();

            gl.bind_vertex_array(Some(VAO));

            gl.bind_buffer(glow::ARRAY_BUFFER, Some(VBO));
            let data = core::slice::from_raw_parts(
                vertices.as_ptr() as *const u8,
                vertices.len() * core::mem::size_of::<f32>(),
            );
            gl.named_buffer_data_u8_slice(VBO, data, glow::STATIC_DRAW);

            gl.bind_buffer(glow::ELEMENT_ARRAY_BUFFER, Some(EBO));
            let data = core::slice::from_raw_parts(
                indices.as_ptr() as *const u8,
                indices.len() * core::mem::size_of::<u32>(),
            );
            gl.named_buffer_data_u8_slice(EBO, data, glow::STATIC_DRAW);

            let stride = 5 * core::mem::size_of::<f32>() as i32;
            gl.enable_vertex_attrib_array(0);
            gl.vertex_attrib_pointer_f32(0, 3, glow::FLOAT, false, stride, 0);

            gl.enable_vertex_attrib_array(1);
            gl.vertex_attrib_pointer_f32(1, 2, glow::FLOAT, false, stride, (3 * core::mem::size_of::<f32>()) as i32 );

            gl.bind_vertex_array(None);

             plane {
                texture: crate::model::TextureFromFile("texture.jpg", "resources", gl.clone()),
                VAO,
                VBO,
                EBO
            }
        }
    }

    pub fn draw(&self, shader: &crate::shader::shader, camera: &Camera)
        {
            unsafe {
                shader.Use();


                let model = cgmath::Matrix4::from_angle_x(cgmath::Deg(-90.0));
                let projection = cgmath::perspective(cgmath::Deg(camera.Zoom), SCR_WIDTH as f32 /SCR_HEIGHT as f32, 0.1, 100.0);
                let view = camera.GetViewMatrix();

                shader.setMat4("model", &model);
                shader.setMat4("view", &view);
                shader.setMat4("projection", &projection);
                shader.setFloat("tile_size", 0.5);
                shader.setFloat("scroll_speed", 10.0);
                let camera_direction = (camera.Position - cgmath::Point3::new(0.0, 0.0, 0.0));
                shader.setVector3("camera_position", camera_direction);

                shader.gl.bind_texture(glow::TEXTURE_2D, Some(self.texture));
                shader.gl.bind_vertex_array(Some(self.VAO));

                shader.gl.draw_elements(glow::TRIANGLES, 6, glow::UNSIGNED_INT, 0);
                shader.gl.bind_vertex_array(None);

                shader.gl.active_texture(glow::TEXTURE0);
            }
        }
}