use crate::post::{Post, Summary, Tweet, Weibo};

mod post;

fn create_one<'a>(
    switch: bool,
    username: &'a str,
    title: String,
    content: String,
) -> Box<dyn Summary + 'a> {
    let post = Post::new(title, username, content);
    if switch {
        Box::new(Weibo::new(username, post))
    } else {
        Box::new(Tweet::new(username, post))
    }
}

fn main() {
    let username = "xfy";
    let test = create_one(
        true,
        username,
        String::from("test"),
        String::from("Hello world"),
    );

    println!("{}", test.summarize())
}

pub struct Weibo<'a> {
    username: &'a str,
    post: Post<'a>,
}

impl<'a> Weibo<'a> {
    pub fn new(username: &'a str, post: Post<'a>) -> Self {
        Self { username, post }
    }
}

pub struct Tweet<'a> {
    username: &'a str,
    post: Post<'a>,
}

impl<'a> Tweet<'a> {
    pub fn new(username: &'a str, post: Post<'a>) -> Self {
        Self { username, post }
    }
}

pub struct Post<'a> {
    title: String,
    author: &'a str,
    content: String,
}

impl<'a> Post<'a> {
    pub fn new(title: String, author: &'a str, content: String) -> Self {
        Self {
            title,
            author,
            content,
        }
    }
}

pub trait Summary {
    fn summarize(&self) -> String;
}

impl<'a> Summary for Weibo<'a> {
    fn summarize(&self) -> String {
        format!("Post {}, author is {}", self.post.title, self.username)
    }
}
impl<'a> Summary for Tweet<'a> {
    fn summarize(&self) -> String {
        format!("Post {}, author is {}", self.post.title, self.username)
    }
}