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use pivotal_tracker::{
	client::Client,
	story::{GetStoryOptions, Story, StoryID},
};
use slug::slugify;
use std::error::Error;

pub struct RunOptions<'a> {
	pub client: &'a Client,
	pub story_id: &'a String,
}

pub async fn run(options: RunOptions<'_>) -> Result<(), Box<dyn Error>> {
	let RunOptions { story_id, client } = options;
	let story_id = story_id
		.parse::<StoryID>()
		.expect(&format!("Invalid story ID in {story_id}"));

	eprintln!("Getting story...");

	let story = client
		.get_story(GetStoryOptions { id: story_id })
		.await
		.expect("Failed to get story");

	eprintln!("Generating branch name...");

	let branch_name = branch_name(&story);

	println!("{branch_name}");

	Ok(())
}

pub fn branch_name(story: &Story) -> String {
	let story_slug = slugify(story.name.trim());
	let mut story_name_words = story_slug.split('-').collect::<Vec<_>>();
	let mut branch_name_parts = vec![
		format!("{}/{}", story.story_type, story_name_words.remove(0)),
		format!("#{}", story.id),
	];

	loop {
		if story_name_words.is_empty() {
			break;
		}

		let branch_length =
			branch_name_parts.iter().fold(0, |acc, x| acc + x.len())
				+ branch_name_parts.len()
				- 1;

		if branch_length + story_name_words[0].len() + 1 > 50 {
			break;
		}

		branch_name_parts.insert(
			branch_name_parts.len() - 1,
			story_name_words.remove(0).into(),
		);
	}

	branch_name_parts.join("-")
}