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//! Pull Commits interface

use hyper::client::connect::Connect;

use users::User;
use {unfold, Future, Github, Stream};

fn identity<T>(x: T) -> T {
    x
}

/// A structure for interfacing with a pull commits
pub struct PullCommits<C>
where
    C: Clone + Connect + 'static,
{
    github: Github<C>,
    owner: String,
    repo: String,
    number: u64,
}

impl<C: Clone + Connect + 'static> PullCommits<C> {
    #[doc(hidden)]
    pub fn new<O, R>(github: Github<C>, owner: O, repo: R, number: u64) -> Self
    where
        O: Into<String>,
        R: Into<String>,
    {
        PullCommits {
            github,
            owner: owner.into(),
            repo: repo.into(),
            number,
        }
    }

    /// list pull commits
    pub fn list(&self) -> Future<Vec<PullCommit>> {
        let uri = format!(
            "/repos/{}/{}/pulls/{}/commits",
            self.owner, self.repo, self.number
        );
        self.github.get::<Vec<PullCommit>>(&uri)
    }

    /// provides a stream over all pages of pull commits
    pub fn iter(&self) -> Stream<PullCommit> {
        unfold(
            self.github.clone(),
            self.github.get_pages(&format!(
                "/repos/{}/{}/pulls/{}/commits",
                self.owner, self.repo, self.number
            )),
            identity,
        )
    }
}

// representations

/// Representation of a pull request commit
#[derive(Debug, Deserialize)]
pub struct PullCommit {
    pub url: String,
    pub sha: String,
    pub html_url: String,
    pub comments_url: String,
    pub commit: CommitDetails,
    pub author: User,
    pub committer: User,
    pub parents: Vec<CommitRef>,
}

/// Representation of a pull request commit details
#[derive(Debug, Deserialize)]
pub struct CommitDetails {
    pub url: String,
    pub author: UserStamp,
    pub committer: Option<UserStamp>,
    pub message: String,
    pub tree: CommitRef,
    pub comment_count: u64,
}

/// Representation of a reference to a commit
#[derive(Debug, Deserialize)]
pub struct CommitRef {
    pub url: String,
    pub sha: String,
}

/// Representation of a git user
#[derive(Debug, Deserialize)]
pub struct UserStamp {
    pub name: String,
    pub email: String,
    pub date: String,
}