// Copyright (C) 2023-2099 The crate authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published by the
// Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
// for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

mod forgejo;
mod gitlab;
mod types;

pub use crate::hooks::forgejo::ForgejoHook;
#[allow(deprecated)]
pub use crate::hooks::gitlab::GitlabHook;
pub use crate::hooks::types::Hook;
use crate::hooks::types::{IssueAction, MergeRequestAction, WikiAction};

pub fn format_hook(hook: &Hook) -> Option<String> {
	Some(match hook {
		Hook::Push(push) if push.object_kind == "tag_push" => {
			let ref_ = push.ref_.strip_prefix("refs/tags/").unwrap_or("?!");
			format!(
				"[{}] {} pushed tag {}.",
				push.repository.name, push.pusher.name, ref_
			)
		}
		Hook::Push(push) => {
			if push.commits.len() == 0 {
				// Ignore: Branch got deleted
				return None;
			}
			let mut text = format!(
				"[{}] {} pushed {} commits to {}",
				push.repository.name,
				push.pusher.name,
				push.commits.len(),
				push.ref_,
			);
			// Display max 3 commits
			for commit in push.commits.clone().into_iter().take(3) {
				match commit.message.lines().nth(0) {
					Some(subject) => {
						text = format!("{}\n• {} <{}>", text, subject, commit.url);
					}
					None => {}
				}
			}
			text
		}
		Hook::Issue(issue) => {
			let action = match issue.action {
				Some(IssueAction::Update) => return None,
				Some(IssueAction::Open) => "opened",
				Some(IssueAction::Close) => "closed",
				Some(IssueAction::Reopen) => "reopened",
				None => return None,
			};
			format!(
				"[{}] {} {} issue {}: {}{}",
				issue.repository.name,
				issue.author.name,
				action,
				issue.id,
				issue.title,
				issue
					.url
					.as_ref()
					.map(|url| format!(" <{}>", url))
					.unwrap_or("".to_owned())
			)
		}
		Hook::MergeRequest(merge_req) => {
			let action = match merge_req.action {
				Some(MergeRequestAction::Update) => return None,
				Some(MergeRequestAction::Open) => "opened",
				Some(MergeRequestAction::Close) => "closed",
				Some(MergeRequestAction::Reopen) => "reopened",
				Some(MergeRequestAction::Merge) => "merged",
				None => return None,
				_ => {
					log::warn!("Unsupported merge request action: {:?}", merge_req.action);
					return None;
				}
			};
			format!(
				"[{}] {} {} merge request {}: {}{}",
				merge_req.repository.name,
				merge_req.author.name,
				action,
				merge_req.id,
				merge_req.title,
				merge_req
					.url
					.as_ref()
					.map(|url| format!(" <{}>", url))
					.unwrap_or("".to_owned())
			)
		}
		Hook::Note(note) => {
			if note.snippet {
				return None;
			}
			if let Some(commit) = &note.commit {
				format!(
					"[{}] {} commented on commit {:?} <{}>",
					note.repository.name, note.author.name, commit.ref_, commit.url,
				)
			} else if let Some(issue) = &note.issue {
				format!(
					"[{}] {} commented on issue {}: {} <{}>",
					note.repository.name, note.author.name, issue.id, issue.title, note.url,
				)
			} else if let Some(mr) = &note.merge_request {
				format!(
					"[{}] {} commented on merge request {}: {} <{}>",
					note.repository.name, note.author.name, mr.id, mr.title, note.url,
				)
			} else {
				unreachable!()
			}
		}
		Hook::Wiki(page) => {
			let action = match page.action {
				WikiAction::Update => "updated",
				WikiAction::Create => "created",
			};
			format!(
				"[{}] {} {} wiki page {} <{}>",
				page.repository.name, page.author.name, action, page.title, page.url,
			)
		}
	})
}