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use std::{fmt::Display, marker::PhantomData};

use crossterm::style::StyledContent;

use crate::prelude::*;

/// A macro to simplify rendering lots of items at once.
/// The Buffer can be anything that implements AsMut<Buffer>
/**
`Example`
```rust, no_run
use crate::prelude::*;

// Create a window
let window = Window::init()?;

// Render This works! and Another Element! To the window's buffer
render!(
    window, [
        (16, 16) => "This works!",
        (0, 0) => "Another Element!"
    ]
)
```
*/
#[macro_export]
macro_rules! render {
    ($buffer:expr, [$($loc:expr => $render:expr),* $(,)?]) => {
        $(
            $render.render($loc, $buffer.as_mut());
        )*
    };
}

/// The main system that will render an element at a location to the buffer.
pub trait Render {
    fn render(&self, loc: Vec2, buffer: &mut Buffer);
}

/* --------------- Implementations --------------- */
impl Render for char {
    fn render(&self, loc: Vec2, buffer: &mut Buffer) {
        buffer.set(loc, *self)
    }
}

impl Render for &str {
    fn render(&self, mut loc: Vec2, buffer: &mut Buffer) {
        let base_x = loc.x;
        for line in self.split('\n') {
            for chr in line.trim().chars().collect::<Vec<char>>() {
                buffer.set(loc, chr);
                loc.x += 1;
            }
            loc.y += 1;
            loc.x = base_x;
        }
    }
}

/// A Render type that doesn't get split. It purely renders the one item to the screen.
/// Useful for multi-character emojis.
pub struct CharString<D: Display, F: Into<StyledContent<D>> + Clone> {
    pub text: F,
    marker: PhantomData<D>,
}

impl<D: Display, F: Into<StyledContent<D>> + Clone> CharString<D, F> {
    pub fn new(text: F) -> Self {
        Self {
            text,
            marker: PhantomData {},
        }
    }
}

impl<D: Display, F: Into<StyledContent<D>> + Clone> Render for CharString<D, F> {
    fn render(&self, loc: Vec2, buffer: &mut Buffer) {
        render!(buffer, [loc => Cell::style(self.text.clone().into())]);
    }
}

impl Render for String {
    fn render(&self, loc: Vec2, buffer: &mut Buffer) {
        render!(buffer, [loc => self.as_str()]);
    }
}

impl Render for Vec<String> {
    fn render(&self, loc: Vec2, buffer: &mut Buffer) {
        render!(buffer, [loc => self.join("\n")]);
    }
}

impl Render for Vec<&str> {
    fn render(&self, loc: Vec2, buffer: &mut Buffer) {
        render!(buffer, [loc => self.join("\n")]);
    }
}

impl<D: Display> Render for StyledContent<D> {
    fn render(&self, mut loc: Vec2, buffer: &mut Buffer) {
        let base_x = loc.x;
        for line in format!("{}", self.content()).split('\n') {
            for char in line.trim().chars().collect::<Vec<char>>() {
                buffer.set(loc, StyledContent::new(*self.style(), char));
                loc.x += 1;
            }
            loc.y += 1;
            loc.x = base_x;
        }
    }
}