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//! Generator implementations for crossterm crate.

mod span;
mod tag;

use crossterm::style::{ContentStyle, Print};

use crate::{
    generator::{
        helper::{flatten, CustomTagParser, GeneratorInfallible, NoopCustomTagParser},
        Generator,
    },
    parser::ItemG,
};

pub use span::Span;
pub use tag::CrosstermTagConvertor;

/// Generator for [crossterm crate][crossterm], generated result is a series of it's [Command][crossterm::Command]s.
///
/// See [docs/tui-tags.ebnf] for supported tags.
///
/// ### Show output
///
/// Execute/Queue all the commands in the buffer where you want to print the result. For example, in stdout:
///
/// ```
/// use std::io::Write;
/// use crossterm::QueueableCommand;
/// use tui_markup::{compile, generator::CrosstermCommandsGenerator};
///
/// let mut stdout = std::io::stdout();
/// let spans = compile::<CrosstermCommandsGenerator>("I have a <green green text>").unwrap();
/// for span in &spans {
///     stdout.queue(span).unwrap();
/// }
/// stdout.flush().unwrap();
/// ```
///
/// See [example/crossterm.rs] for a example code.
///
/// [docs/tui-tags.ebnf]: https://github.com/7sDream/tui-markup/blob/master/docs/tui-tags.ebnf
/// [example/crossterm.rs]: https://github.com/7sDream/tui-markup/blob/master/example/crossterm.rs
#[cfg_attr(docsrs, doc(cfg(feature = "crossterm")))]
#[derive(Debug)]
pub struct CrosstermCommandsGenerator<P = NoopCustomTagParser<ContentStyle>> {
    convertor: CrosstermTagConvertor<P>,
}

impl<P> Default for CrosstermCommandsGenerator<P> {
    fn default() -> Self {
        Self {
            convertor: CrosstermTagConvertor::<P>::default(),
        }
    }
}

impl<P> CrosstermCommandsGenerator<P> {
    /// Create a new generator, with a custom tag parser.
    pub fn new(p: P) -> Self {
        Self {
            convertor: CrosstermTagConvertor::new(p),
        }
    }
}

impl<'a, P> Generator<'a> for CrosstermCommandsGenerator<P>
where
    P: CustomTagParser<Output = ContentStyle>,
{
    type Convertor = CrosstermTagConvertor<P>;

    type Output = Vec<Span<'a>>;

    type Err = GeneratorInfallible;

    fn convertor(&mut self) -> &mut Self::Convertor {
        &mut self.convertor
    }

    fn generate(&mut self, items: Vec<Vec<ItemG<'a, Self>>>) -> Result<Self::Output, Self::Err> {
        Ok(items.into_iter().map(flatten).fold(vec![], |mut acc, line| {
            if !acc.is_empty() {
                acc.push(Span::NoStyle(Print("\n")));
            }
            acc.extend(line);
            acc
        }))
    }
}