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    /*
     * Copyright (C) 2022  Aravinth Manivannan <realaravinth@batsense.net>
     *
     * 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/>.
     */
    #[cfg(test)]
    use std::println as info;
    #[cfg(test)]
    use std::println as error;
    #[cfg(test)]
    use std::println as debug;

    use git2::{build::CheckoutBuilder, BranchType, Direction, Oid, Remote, Repository};
    use serde::Deserialize;
    use serde::Serialize;
    #[cfg(not(test))]
    use tracing::{debug, error, info};
    use uuid::Uuid;

    use crate::db::Site;
    use crate::errors::*;
    use crate::settings::Settings;
    use crate::utils::get_website_path;

    #[derive(Debug, Clone, Eq, PartialEq, Serialize, Deserialize)]
    pub struct Page {
        pub secret: String,
        pub repo: String,
        pub path: String,
        pub branch: String,
        pub domain: String,
        pub pub_id: Uuid,
    }

    impl Page {
        pub fn from_site(settings: &Settings, s: Site) -> Self {
            Self {
                secret: s.site_secret,
                repo: s.repo_url,
                path: get_website_path(settings, &s.hostname)
                    .to_str()
                    .unwrap()
                    .to_owned(),
                domain: s.hostname,
                branch: s.branch,
                pub_id: s.pub_id,
            }
        }
        pub fn open_repo(&self) -> ServiceResult<Repository> {
            Ok(Repository::open(&self.path)?)
        }

        fn create_repo(&self) -> ServiceResult<Repository> {
            let repo = self.open_repo();

            let repo = if let Ok(repo) = repo {
                repo
            } else {
                info!("Cloning repository {} at {}", self.repo, self.path);
                Repository::clone(&self.repo, &self.path)?;
                Repository::open(&self.path)?
            };

            self._fetch_remote_branch(&repo, &self.branch)?;
            self.deploy_branch(&repo).unwrap();

            Ok(repo)
        }

        pub fn deploy_branch(&self, repo: &Repository) -> ServiceResult<()> {
            let mut checkout_options = CheckoutBuilder::default();
            checkout_options
                .allow_conflicts(true)
                .conflict_style_merge(true)
                .force();

            let refname = format!("refs/heads/{}", self.branch);

            repo.set_head(&refname).unwrap();
            repo.checkout_head(Some(&mut checkout_options)).unwrap();

            info!("Deploying branch {}", self.branch);
            Ok(())
        }

        fn fetch<'a>(
            &self,
            repo: &'a git2::Repository,
            branch: &str,
        ) -> ServiceResult<git2::AnnotatedCommit<'a>> {
            let mut remote = repo.find_remote("origin")?;
            info!("Fetching {} for repo", remote.name().unwrap());
            remote.fetch(&[branch], None, None)?;
            let fetch_head = repo.find_reference("FETCH_HEAD")?;
            Ok(repo.reference_to_annotated_commit(&fetch_head)?)
        }

        fn merge<'a>(
            &self,
            repo: &'a Repository,
            fetch_commit: git2::AnnotatedCommit<'a>,
            branch: &str,
        ) -> ServiceResult<()> {
            // 1. do a merge analysis
            let analysis = repo.merge_analysis(&[&fetch_commit])?;

            // 2. Do the appropriate merge
            if analysis.0.is_fast_forward() {
                debug!("Doing a fast forward");
                // do a fast forward
                let refname = format!("refs/heads/{}", branch);
                match repo.find_reference(&refname) {
                    Ok(mut r) => {
                        debug!("fast forwarding");
                        Self::fast_forward(repo, &mut r, &fetch_commit).unwrap();
                    }
                    Err(_) => {
                        // The branch doesn't exist so just set the reference to the
                        // commit directly. Usually this is because you are pulling
                        // into an empty repository.
                        error!("Error in find ref");
                        repo.reference(
                            &refname,
                            fetch_commit.id(),
                            true,
                            &format!("Setting {} to {}", branch, fetch_commit.id()),
                        )
                        .unwrap();
                        repo.set_head(&refname).unwrap();
                        repo.checkout_head(Some(
                            git2::build::CheckoutBuilder::default()
                                .allow_conflicts(true)
                                .conflict_style_merge(true)
                                .force(),
                        ))
                        .unwrap();
                    }
                };
            } else if analysis.0.is_normal() {
                // do a normal merge
                // expects repo.head to point to the branch when is going to receive merges
                let head_commit = repo
                    .reference_to_annotated_commit(&repo.head().unwrap())
                    .unwrap();
                Self::normal_merge(repo, &head_commit, &fetch_commit).unwrap();
            } else {
                info!("Nothing to do...");
            }
            Ok(())
        }

        fn _fetch_remote_branch(&self, repo: &Repository, branch: &str) -> ServiceResult<()> {
            let mut remote = Self::get_deploy_remote(repo)?;
            remote.connect(Direction::Fetch)?;
            info!("Updating repository {}", self.repo);
            let remote_branch_name = format!("origin/{branch}");
            remote.fetch(&[&remote_branch_name], None, None)?;
            remote.disconnect()?;
            let branch = repo.find_branch(&remote_branch_name, BranchType::Remote)?;
            let commit = branch.get().peel_to_commit()?;
            if repo.find_branch(&self.branch, BranchType::Local).is_err() {
                repo.branch(&self.branch, &commit, true)?;
            }
            Ok(())
        }

        fn normal_merge(
            repo: &Repository,
            local: &git2::AnnotatedCommit,
            remote: &git2::AnnotatedCommit,
        ) -> Result<(), git2::Error> {
            let local_tree = repo.find_commit(local.id())?.tree().unwrap();
            let remote_tree = repo.find_commit(remote.id())?.tree().unwrap();
            debug!("{} {}", local.id(), remote.id());
            let ancestor = repo
                .find_commit(repo.merge_base(local.id(), remote.id()).unwrap())
                .unwrap()
                .tree()
                .unwrap();
            let mut idx = repo
                .merge_trees(&ancestor, &local_tree, &remote_tree, None)
                .unwrap();

            if idx.has_conflicts() {
                debug!("Merge conflicts detected...");
                repo.checkout_index(Some(&mut idx), None)?;
                return Ok(());
            }
            let result_tree = repo.find_tree(idx.write_tree_to(repo)?)?;
            // now create the merge commit
            let msg = format!("Merge: {} into {}", remote.id(), local.id());
            let sig = repo.signature()?;
            let local_commit = repo.find_commit(local.id())?;
            let remote_commit = repo.find_commit(remote.id())?;
            // Do our merge commit and set current branch head to that commit.
            let _merge_commit = repo.commit(
                Some("HEAD"),
                &sig,
                &sig,
                &msg,
                &result_tree,
                &[&local_commit, &remote_commit],
            )?;
            // Set working tree to match head.
            repo.checkout_head(None)?;
            Ok(())
        }

        fn fast_forward(
            repo: &Repository,
            lb: &mut git2::Reference,
            rc: &git2::AnnotatedCommit,
        ) -> ServiceResult<()> {
            let name = match lb.name() {
                Some(s) => s.to_string(),
                None => String::from_utf8_lossy(lb.name_bytes()).to_string(),
            };
            let msg = format!("Fast-Forward: Setting {} to id: {}", name, rc.id());
            debug!("{}", msg);
            lb.set_target(rc.id(), &msg)?;
            repo.set_head(&name)?;
            repo.checkout_head(Some(git2::build::CheckoutBuilder::default().force()))?;
            Ok(())
        }

        pub fn update(&self, branch: &str) -> ServiceResult<()> {
            let repo = self.create_repo()?;
            let fetch_commit = self.fetch(&repo, branch)?;
            self.merge(&repo, fetch_commit, branch)?;
            Ok(())
        }

        pub fn get_deploy_branch(&self, repo: &Repository) -> ServiceResult<String> {
            let branch = repo.find_branch(&self.branch, BranchType::Local)?;
            if branch.is_head() {
                Ok(self.branch.clone())
            } else {
                Err(ServiceError::BranchNotFound(self.branch.clone()))
            }
        }

        pub fn get_deploy_commit(repo: &Repository) -> ServiceResult<Oid> {
            let head = repo.head()?;
            let commit = head.peel_to_commit()?;
            Ok(commit.id())
        }

        pub fn get_deploy_remote(repo: &Repository) -> ServiceResult<Remote> {
            Ok(repo.find_remote("origin")?)
        }
    }

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

        use git2::Repository;
        use mktemp::Temp;

        use crate::tests;

        #[actix_rt::test]
        async fn pages_works() {
            let tmp_dir = Temp::new_dir().unwrap();
            assert!(tmp_dir.exists(), "tmp directory successully created");
            let mut page = Page {
                secret: String::default(),
                repo: tests::REPO_URL.into(),
                path: tmp_dir.to_str().unwrap().to_string(),
                branch: tests::BRANCH.to_string(),
                domain: "mcaptcha.org".into(),
                pub_id: Uuid::new_v4(),
            };

            assert!(
                Repository::open(tmp_dir.as_path()).is_err(),
                "repository doesn't exist yet"
            );

            let repo = page.create_repo().unwrap();
            assert!(!repo.is_bare(), "repository isn't bare");
            page.create_repo().unwrap();
            assert!(
                Repository::open(tmp_dir.as_path()).is_ok(),
                "repository exists yet"
            );

            let gh_pages = page.get_deploy_branch(&repo).unwrap();
            assert_eq!(gh_pages, "gh-pages");
            page.branch = "master".to_string();
            page.update(&page.branch).unwrap();
            let master = page.get_deploy_branch(&repo).unwrap();
            assert_eq!(master, "master");

            assert_eq!(
                Page::get_deploy_remote(&repo).unwrap().url().unwrap(),
                page.repo
            );
        }
    }