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use crate::convert;
use serde::{Deserialize, Serialize};

pub mod mrkdwn;
pub mod plain;

pub use mrkdwn::Contents as Mrkdwn;
pub use plain::Contents as Plain;

pub trait ToSlackPlaintext: Sized + Into<Plain> {
    /// Convert to slack plain_text
    fn plaintext(self) -> Plain {
        self.into()
    }
}

impl<T: Into<Plain>> ToSlackPlaintext for T {}

pub trait ToSlackMarkdown: Sized + Into<Mrkdwn> {
    /// Convert to slack plain_text
    fn markdown(self) -> Mrkdwn {
        self.into()
    }
}

impl<T: Into<Mrkdwn>> ToSlackMarkdown for T {}

/// # Text Object
/// [_slack api docs 🔗_](https://api.slack.com/reference/block-kit/composition-objects#text)
///
/// An object containing some text,
/// formatted either as `plain_text`
/// or using [`mrkdwn` 🔗](https://api.slack.com/reference/surfaces/formatting),
/// our proprietary textual markup that's just different enough
/// from Markdown to frustrate you.
#[derive(Clone, Debug, Deserialize, Hash, PartialEq, Serialize)]
#[serde(tag = "type", rename_all = "snake_case")]
pub enum Text {
    Mrkdwn(mrkdwn::Contents),
    #[serde(rename = "plain_text")]
    Plain(plain::Contents),
}

impl Text {
    /// Clone the data behind a reference, then convert it into
    /// a `Text`
    ///
    /// # Arguments
    /// - `contents` - Anything that can be cloned into a type
    ///     that is convertable to a `Text` - this includes
    ///     the `Plain` and `Mrkdwn` contents structs.
    ///     Notably, this doesn't include a conversion directly
    ///     from a reference to a `String` or a `&str` - that's
    ///     because assuming which kind of text a string represents
    ///     could lead to unexpected behavior when that kind of text
    ///     isn't valid.
    pub fn copy_from<T: Into<Self> + Clone>(contents: &T) -> Self {
        contents.clone().into()
    }
}

convert!(impl From<mrkdwn::Contents> for Text => |contents| Text::Mrkdwn(contents));
convert!(impl From<plain::Contents> for Text => |contents| Text::Plain(contents));

impl AsRef<str> for Text {
    fn as_ref(&self) -> &str {
        match self {
            Self::Mrkdwn(cts) => cts.as_ref(),
            Self::Plain(cts) => cts.as_ref(),
        }
    }
}