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use std::slice::Iter;

use crate::{comment::Comment, fragment::Fragment};

/// A collection of comments from a [`CommitMessage`]
#[derive(Debug, PartialEq, Clone, Default)]
pub struct Comments {
    comments: Vec<Comment>,
}

impl Comments {
    /// Iterate over the [`Comment`] in the [`Comments`]
    ///
    /// # Examples
    ///
    /// ```
    /// use mit_commit::{Comment, Comments};
    ///
    /// let trailers = Comments::from(vec![
    ///     Comment::from("# Comment 1"),
    ///     Comment::from("# Comment 2"),
    ///     Comment::from("# Comment 3"),
    /// ]);
    /// let mut iterator = trailers.iter();
    ///
    /// assert_eq!(iterator.next(), Some(&Comment::from("# Comment 1")));
    /// assert_eq!(iterator.next(), Some(&Comment::from("# Comment 2")));
    /// assert_eq!(iterator.next(), Some(&Comment::from("# Comment 3")));
    /// assert_eq!(iterator.next(), None);
    /// ```
    #[must_use]
    pub fn iter(&self) -> Iter<'_, Comment> {
        self.comments.iter()
    }
}

impl IntoIterator for Comments {
    type IntoIter = std::vec::IntoIter<Comment>;
    type Item = Comment;

    /// Iterate over the [`Comment`] in the [`Comments`]
    ///
    /// # Examples
    ///
    /// ```
    /// use mit_commit::{Comment, Comments};
    ///
    /// let trailers = Comments::from(vec![
    ///     Comment::from("# Comment 1"),
    ///     Comment::from("# Comment 2"),
    ///     Comment::from("# Comment 3"),
    /// ]);
    /// let mut iterator = trailers.into_iter();
    ///
    /// assert_eq!(iterator.next(), Some(Comment::from("# Comment 1")));
    /// assert_eq!(iterator.next(), Some(Comment::from("# Comment 2")));
    /// assert_eq!(iterator.next(), Some(Comment::from("# Comment 3")));
    /// assert_eq!(iterator.next(), None);
    /// ```
    fn into_iter(self) -> Self::IntoIter {
        self.comments.into_iter()
    }
}

impl From<Vec<Comment>> for Comments {
    fn from(comments: Vec<Comment>) -> Self {
        Self { comments }
    }
}

impl From<Comments> for String {
    fn from(comments: Comments) -> Self {
        comments
            .comments
            .into_iter()
            .map(Self::from)
            .collect::<Vec<_>>()
            .join("\n\n")
    }
}

impl From<Vec<Fragment>> for Comments {
    fn from(ast: Vec<Fragment>) -> Self {
        ast.iter()
            .filter_map(|values| {
                if let Fragment::Comment(comment) = values {
                    Some(comment.clone())
                } else {
                    None
                }
            })
            .collect::<Vec<Comment>>()
            .into()
    }
}

#[cfg(test)]
mod tests {
    use indoc::indoc;

    use super::Comments;
    use crate::{body::Body, comment::Comment, fragment::Fragment};

    #[test]
    fn implements_iterator() {
        use crate::{Comment, Comments};
        let trailers = Comments::from(vec![
            Comment::from("# Comment 1"),
            Comment::from("# Comment 2"),
            Comment::from("# Comment 3"),
        ]);
        let mut iterator = trailers.iter();

        assert_eq!(iterator.next(), Some(&Comment::from("# Comment 1")));
        assert_eq!(iterator.next(), Some(&Comment::from("# Comment 2")));
        assert_eq!(iterator.next(), Some(&Comment::from("# Comment 3")));
        assert_eq!(iterator.next(), None);
    }

    #[test]
    fn it_can_give_me_it_as_a_string() {
        let comments = Comments::from(vec![
            Comment::from("# Message Body"),
            Comment::from("# Another Message Body"),
        ]);

        assert_eq!(
            String::from(comments),
            String::from(indoc!(
                "
                # Message Body

                # Another Message Body"
            ))
        );
    }

    #[test]
    fn it_can_create_itself_from_an_ast() {
        let comments = Comments::from(vec![
            Fragment::Comment(Comment::from("# Message Body")),
            Fragment::Body(Body::from("Some body content")),
            Fragment::Comment(Comment::from("# Another Message Body")),
        ]);

        assert_eq!(
            comments,
            Comments::from(vec![
                Comment::from("# Message Body"),
                Comment::from("# Another Message Body"),
            ])
        );
    }
}