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#![cfg(not(tarpaulin_include))]

use std::path::Path;

use lazy_static::lazy_static;

use crate::{testutil::JAN_2021_EPOCH, Repository};

lazy_static! {
	static ref DEFAULT_COMMIT_OPTIONS: CreateCommitOptions = CreateCommitOptions::default();
}

/// Options for creating a new commit.
#[derive(Debug)]
#[allow(clippy::module_name_repetitions)]
pub struct CreateCommitOptions {
	author_name: String,
	author_email: String,
	author_time: Option<i64>,
	committer_name: Option<String>,
	committer_email: Option<String>,
	committer_time: i64,
	head_name: String,
	message: String,
}

impl CreateCommitOptions {
	/// Create a new instance.
	#[inline]
	#[must_use]
	pub fn new() -> Self {
		Self::default()
	}

	/// Set the author name and related email address.
	#[inline]
	pub fn author(&mut self, name: &str) -> &mut Self {
		self.author_name = String::from(name);
		self.author_email = format!("{}@example.com", name.to_lowercase());
		self
	}

	/// Set the author name.
	#[inline]
	pub fn author_name(&mut self, name: &str) -> &mut Self {
		self.author_name = String::from(name);
		self
	}

	/// Set the author email address.
	#[inline]
	pub fn author_email(&mut self, email: &str) -> &mut Self {
		self.author_email = String::from(email);
		self
	}

	/// Set the authored commit time.
	#[inline]
	pub fn author_time(&mut self, time: i64) -> &mut Self {
		self.author_time = Some(time);
		self
	}

	/// Set the committer name and related email address.
	#[inline]
	pub fn committer(&mut self, name: &str) -> &mut Self {
		self.committer_name = Some(String::from(name));
		self.committer_email = Some(format!("{}@example.com", name.to_lowercase()));
		self
	}

	/// Set the committer name.
	#[inline]
	pub fn committer_name(&mut self, name: &str) -> &mut Self {
		self.committer_name = Some(String::from(name));
		self
	}

	/// Set the committer email.
	#[inline]
	pub fn committer_email(&mut self, email: &str) -> &mut Self {
		self.committer_email = Some(String::from(email));
		self
	}

	/// Set the committed commit time.
	#[inline]
	pub fn commit_time(&mut self, time: i64) -> &mut Self {
		self.committer_time = time;
		self
	}

	/// Set the head name.
	#[inline]
	pub fn head_name(&mut self, name: &str) -> &mut Self {
		self.head_name = String::from(name);
		self
	}

	/// Set the commit message.
	#[inline]
	pub fn message(&mut self, message: &str) -> &mut Self {
		self.message = String::from(message);
		self
	}
}

impl Default for CreateCommitOptions {
	#[inline]
	fn default() -> Self {
		Self {
			author_name: String::from("Author"),
			author_email: String::from("author@example.com"),
			author_time: None,
			committer_name: None,
			committer_email: None,
			committer_time: JAN_2021_EPOCH,
			head_name: String::from("main"),
			message: String::from("title\n\nbody"),
		}
	}
}

/// Add a path to the working index.
#[inline]
pub fn add_path_to_index(repo: &Repository, path: &Path) {
	repo.add_path_to_index(path).expect("Unable to add path to index");
}

/// Remove a path to the working index.
#[inline]
pub fn remove_path_from_index(repo: &Repository, path: &Path) {
	repo.remove_path_from_index(path)
		.expect("Unable to remove path from index");
}

/// Create a commit based on the provided options. If `options` is not provided, will create a
/// commit using the default options. This function does not add modified or new files to the stage
/// before creating a commit.
#[inline]
pub fn create_commit(repository: &Repository, options: Option<&CreateCommitOptions>) {
	let opts = options.unwrap_or(&DEFAULT_COMMIT_OPTIONS);
	let author_sig = git2::Signature::new(
		opts.author_name.as_str(),
		opts.author_email.as_str(),
		&git2::Time::new(opts.author_time.unwrap_or(opts.committer_time), 0),
	)
	.expect("Unable to create author signature");
	let committer_sig = git2::Signature::new(
		opts.committer_name.as_ref().unwrap_or(&opts.author_name).as_str(),
		opts.committer_email.as_ref().unwrap_or(&opts.author_email).as_str(),
		&git2::Time::new(opts.committer_time, 0),
	)
	.expect("Unable to create comitter signature");
	let ref_name = format!("refs/heads/{}", opts.head_name);

	repository
		.create_commit_on_index(ref_name.as_str(), &author_sig, &committer_sig, opts.message.as_str())
		.expect("Unable to create commit");
}