use crate as git;
use git_next_config as config;

mod commit {
    use super::*;

    #[test]
    fn should_return_sha() {
        let sha = given::a_commit_sha();
        let commit = given::a_commit_with_sha(&sha);

        assert_eq!(commit.sha(), &sha);
    }
    #[test]
    fn should_return_message() {
        let message = given::a_commit_message();
        let commit = given::a_commit_with_message(&message);

        assert_eq!(commit.message(), &message);
    }
    #[test]
    fn should_convert_from_push() {
        let sha = given::a_commit_sha();
        let message = given::a_commit_message();
        let push = given::a_webhook_push(&sha, &message);
        let commit = git::Commit::from(push);

        let expected = git::Commit::new(
            git::commit::Sha::new(sha.to_string()),
            git::commit::Message::new(message.to_string()),
        );

        assert_eq!(commit, expected);
    }
}
mod generation {
    use crate::Generation;

    #[test]
    fn should_increment() {
        let mut g = Generation::new();
        assert_eq!(g.to_string(), "0");

        g.inc();

        assert_eq!(g.to_string(), "1");
    }
}
mod gitref {
    use crate::{commit, Commit, GitRef};
    #[test]
    fn should_convert_from_commit() {
        let commit = Commit::new(
            commit::Sha::new("sha".to_string()),
            commit::Message::new("message".to_string()),
        );
        let gitref = GitRef::from(commit);

        assert_eq!(gitref.to_string(), "sha");
    }
}
mod gitremote {
    use git_next_config::{Hostname, RepoPath};

    use crate::GitRemote;

    #[test]
    fn should_return_hostname() {
        let host = Hostname::new("localhost".to_string());
        let repo_path = RepoPath::new("kemitix/git-next".to_string());
        let gr = GitRemote::new(host.clone(), repo_path);

        assert_eq!(gr.host(), &host);
    }
    #[test]
    fn should_return_repo_path() {
        let host = Hostname::new("localhost".to_string());
        let repo_path = RepoPath::new("kemitix/git-next".to_string());
        let gr = GitRemote::new(host, repo_path.clone());

        assert_eq!(gr.repo_path(), &repo_path);
    }
}
mod push {
    use super::*;
    use crate::GitRef;

    #[test]
    fn force_no_should_display() {
        assert_eq!(git::push::Force::No.to_string(), "fast-forward")
    }

    #[test]
    fn force_from_should_display() {
        let sha = given::a_name();
        let commit = given::a_commit_with_sha(&git::commit::Sha::new(sha.clone()));
        assert_eq!(
            git::push::Force::From(GitRef::from(commit)).to_string(),
            format!("force-if-from:{sha}")
        )
    }

    mod reset {
        use super::*;
        use crate::{tests::given, OpenRepository};
        use assert2::let_assert;

        #[test]
        fn should_perform_a_fetch_then_push() {
            let fs = given::a_filesystem();
            let (mock_open_repository, gitdir, mock_repository) = given::an_open_repository(&fs);
            let open_repository: OpenRepository = mock_open_repository.into();
            let repo_details = given::repo_details(&fs);
            let branch_name = &repo_details.branch;
            let commit = given::a_commit();
            let gitref = GitRef::from(commit);
            let_assert!(
                Ok(_) = git::push::reset(
                    &open_repository,
                    &repo_details,
                    branch_name,
                    &gitref,
                    &git::push::Force::No
                )
            );
            let_assert!(Some(mock_open_repository) = mock_repository.get(&gitdir));
            let operations = mock_open_repository.operations();
            let forge_alias = repo_details.forge.forge_alias();
            let repo_alias = &repo_details.repo_alias;
            let to_commit = gitref;
            let force = "fast-forward";
            assert_eq!(
                operations,
                vec![format!("fetch"), format!("push fa:{forge_alias} ra:{repo_alias} bn:{branch_name} tc:{to_commit} f:{force}")]
            );
        }
    }
}
mod repo_details {

    use std::{collections::BTreeMap, path::PathBuf};

    use git_next_config::{
        ForgeAlias, ForgeConfig, ForgeType, GitDir, Hostname, RepoAlias, RepoPath, ServerRepoConfig,
    };
    use secrecy::ExposeSecret;

    use crate::{Generation, GitRemote, RepoDetails};

    #[test]
    fn should_return_origin() {
        let rd = RepoDetails::new(
            Generation::new(),
            &RepoAlias::new("foo"),
            &ServerRepoConfig::new(
                "repo".to_string(),
                "branch".to_string(),
                None,
                None,
                None,
                None,
            ),
            &ForgeAlias::new("default".to_string()),
            &ForgeConfig::new(
                ForgeType::MockForge,
                "host".to_string(),
                "user".to_string(),
                "token".to_string(),
                BTreeMap::new(),
            ),
            GitDir::from(PathBuf::default().join("foo")),
        );

        assert_eq!(
            rd.origin().expose_secret(),
            "https://user:token@host/repo.git"
        );
    }
    #[test]
    fn should_return_git_remote() {
        let rd = RepoDetails::new(
            Generation::new(),
            &RepoAlias::new("foo"),
            &ServerRepoConfig::new(
                "user/repo".to_string(),
                "branch".to_string(),
                None,
                None,
                None,
                None,
            ),
            &ForgeAlias::new("default".to_string()),
            &ForgeConfig::new(
                ForgeType::MockForge,
                "host".to_string(),
                "user".to_string(),
                "token".to_string(),
                BTreeMap::new(),
            ),
            GitDir::from(PathBuf::default().join("foo")),
        );

        assert_eq!(
            rd.git_remote(),
            GitRemote::new(
                Hostname::new("host".to_string()),
                RepoPath::new("user/repo".to_string())
            )
        );
    }
}
pub mod given {
    use std::path::PathBuf;

    //
    use crate::{
        self as git,
        repository::{MockOpenRepository, MockRepository},
        tests::given,
    };
    use config::{
        BranchName, ForgeAlias, ForgeConfig, ForgeType, GitDir, RepoAlias, RepoBranches,
        RepoConfig, ServerRepoConfig,
    };
    use git_next_config as config;

    use crate::RepoDetails;

    pub fn repo_branches() -> RepoBranches {
        RepoBranches::new(
            format!("main-{}", a_name()),
            format!("next-{}", a_name()),
            format!("dev-{}", a_name()),
        )
    }

    pub fn a_forge_alias() -> ForgeAlias {
        ForgeAlias::new(a_name())
    }

    pub fn a_repo_alias() -> RepoAlias {
        RepoAlias::new(a_name())
    }

    pub fn a_pathbuf() -> PathBuf {
        PathBuf::from(given::a_name())
    }

    pub fn a_name() -> String {
        use rand::Rng;
        use std::iter;

        fn generate(len: usize) -> String {
            const CHARSET: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
            let mut rng = rand::thread_rng();
            let one_char = || CHARSET[rng.gen_range(0..CHARSET.len())] as char;
            iter::repeat_with(one_char).take(len).collect()
        }
        generate(5)
    }

    pub fn a_branch_name() -> BranchName {
        BranchName::new(a_name())
    }

    pub fn a_git_dir(fs: &kxio::fs::FileSystem) -> GitDir {
        let dir_name = a_name();
        let dir = fs.base().join(dir_name);
        GitDir::new(dir)
    }

    pub fn a_forge_config() -> ForgeConfig {
        ForgeConfig::new(
            ForgeType::MockForge,
            a_name(),
            a_name(),
            a_name(),
            Default::default(), // no repos
        )
    }

    pub fn a_server_repo_config() -> ServerRepoConfig {
        let main = a_branch_name().unwrap();
        let next = a_branch_name().unwrap();
        let dev = a_branch_name().unwrap();
        ServerRepoConfig::new(
            format!("{}/{}", a_name(), a_name()),
            main.clone(),
            None,
            Some(main),
            Some(next),
            Some(dev),
        )
    }

    pub fn a_repo_config() -> RepoConfig {
        RepoConfig::new(given::repo_branches(), config::RepoConfigSource::Repo)
    }

    pub fn a_commit() -> git::Commit {
        git::Commit::new(a_commit_sha(), a_commit_message())
    }

    pub fn a_commit_with_message(message: &git::commit::Message) -> git::Commit {
        git::Commit::new(a_commit_sha(), message.to_owned())
    }

    pub fn a_commit_with_sha(sha: &git::commit::Sha) -> git::Commit {
        git::Commit::new(sha.to_owned(), a_commit_message())
    }

    pub fn a_commit_message() -> git::commit::Message {
        git::commit::Message::new(a_name())
    }

    pub fn a_commit_sha() -> git::commit::Sha {
        git::commit::Sha::new(a_name())
    }

    pub fn a_webhook_push(
        sha: &git::commit::Sha,
        message: &git::commit::Message,
    ) -> config::webhook::Push {
        let branch = a_branch_name();
        config::webhook::Push::new(branch, sha.to_string(), message.to_string())
    }

    pub fn a_filesystem() -> kxio::fs::FileSystem {
        kxio::fs::temp().unwrap_or_else(|e| panic!("{}", e))
    }

    pub fn repo_details(fs: &kxio::fs::FileSystem) -> git::RepoDetails {
        let generation = git::Generation::new();
        let repo_alias = a_repo_alias();
        let server_repo_config = a_server_repo_config();
        let forge_alias = a_forge_alias();
        let forge_config = a_forge_config();
        let gitdir = a_git_dir(fs);
        RepoDetails::new(
            generation,
            &repo_alias,
            &server_repo_config,
            &forge_alias,
            &forge_config,
            gitdir,
        )
    }

    pub fn an_open_repository(
        fs: &kxio::fs::FileSystem,
    ) -> (MockOpenRepository, GitDir, MockRepository) {
        let mut mock = git::repository::mock();
        let gitdir = a_git_dir(fs);
        let or = mock.given_can_be_opened(&gitdir);
        (or, gitdir, mock)
    }
}
pub mod then {
    use std::path::{Path, PathBuf};

    type TestResult = Result<(), Box<dyn std::error::Error>>;

    use super::*;

    pub fn commit_named_file_to_branch(
        file_name: &Path,
        contents: &str,
        fs: &kxio::fs::FileSystem,
        gitdir: &config::GitDir,
        branch_name: &config::BranchName,
    ) -> TestResult {
        // git checkout ${branch_name}
        git_checkout_new_branch(branch_name, gitdir)?;
        // echo ${word} > file-${word}
        let pathbuf = PathBuf::from(gitdir);
        let file = fs.base().join(pathbuf).join(file_name);
        #[allow(clippy::expect_used)]
        fs.file_write(&file, contents)?;
        // git add ${file}
        git_add_file(gitdir, &file)?;
        // git commit -m"Added ${file}"
        git_commit(gitdir, &file)?;

        then::push_branch(fs, gitdir, branch_name)?;

        Ok(())
    }

    pub fn create_a_commit_on_branch(
        fs: &kxio::fs::FileSystem,
        gitdir: &config::GitDir,
        branch_name: &config::BranchName,
    ) -> TestResult {
        // git checkout ${branch_name}
        git_checkout_new_branch(branch_name, gitdir)?;
        // echo ${word} > file-${word}
        let word = given::a_name();
        let pathbuf = PathBuf::from(gitdir);
        let file = fs.base().join(pathbuf).join(&word);
        fs.file_write(&file, &word)?;
        // git add ${file}
        git_add_file(gitdir, &file)?;
        // git commit -m"Added ${file}"
        git_commit(gitdir, &file)?;

        then::push_branch(fs, gitdir, branch_name)?;

        Ok(())
    }

    fn push_branch(
        fs: &kxio::fs::FileSystem,
        gitdir: &config::GitDir,
        branch_name: &config::BranchName,
    ) -> TestResult {
        let gitrefs = fs
            .base()
            .join(gitdir.to_path_buf())
            .join(".git")
            .join("refs");
        let local_branch = gitrefs.join("heads").join(branch_name.to_string().as_str());
        let origin_heads = gitrefs.join("remotes").join("origin");
        let remote_branch = origin_heads.join(branch_name.to_string().as_str());
        let contents = fs.file_read_to_string(&local_branch)?;
        fs.dir_create_all(&origin_heads)?;
        fs.file_write(&remote_branch, &contents)?;
        Ok(())
    }

    pub fn git_checkout_new_branch(
        branch_name: &git_next_config::BranchName,
        gitdir: &git_next_config::GitDir,
    ) -> TestResult {
        exec(
            format!("git checkout -b {}", branch_name),
            std::process::Command::new("/usr/bin/git")
                .current_dir(gitdir.to_path_buf())
                .args(["checkout", "-b", branch_name.to_string().as_str()])
                .output(),
        )?;
        Ok(())
    }

    pub fn git_switch(
        branch_name: &git_next_config::BranchName,
        gitdir: &git_next_config::GitDir,
    ) -> TestResult {
        exec(
            format!("git switch {}", branch_name),
            std::process::Command::new("/usr/bin/git")
                .current_dir(gitdir.to_path_buf())
                .args(["switch", branch_name.to_string().as_str()])
                .output(),
        )
    }

    fn exec(label: String, output: Result<std::process::Output, std::io::Error>) -> TestResult {
        eprintln!("== {label}");
        match output {
            Ok(output) => {
                eprintln!(
                    "\nstdout:\n{}",
                    String::from_utf8_lossy(output.stdout.as_slice())
                );
                eprintln!(
                    "\nstderr:\n{}",
                    String::from_utf8_lossy(output.stderr.as_slice())
                );
                eprintln!("=============================");
                Ok(())
            }
            Err(err) => {
                eprintln!("ERROR: {err:#?}");
                Ok(Err(err)?)
            }
        }
    }

    fn git_add_file(gitdir: &git_next_config::GitDir, file: &Path) -> TestResult {
        exec(
            format!("git add {file:?}"),
            std::process::Command::new("/usr/bin/git")
                .current_dir(gitdir.to_path_buf())
                .args(["add", file.display().to_string().as_str()])
                .output(),
        )
    }

    fn git_commit(gitdir: &git_next_config::GitDir, file: &Path) -> TestResult {
        exec(
            format!(r#"git commit -m"Added {file:?}""#),
            std::process::Command::new("/usr/bin/git")
                .current_dir(gitdir.to_path_buf())
                .args([
                    "commit",
                    format!(r#"-m"Added {}"#, file.display().to_string().as_str()).as_str(),
                ])
                .output(),
        )
    }

    pub fn git_log_all(gitdir: &config::GitDir) -> TestResult {
        exec(
            "git log --all --oneline --decorate --graph".to_string(),
            std::process::Command::new("/usr/bin/git")
                .current_dir(gitdir.to_path_buf())
                .args(["log", "--all", "--oneline", "--decorate", "--graph"])
                .output(),
        )
    }

    pub fn get_sha_for_branch(
        fs: &kxio::fs::FileSystem,
        gitdir: &git_next_config::GitDir,
        branch_name: &git_next_config::BranchName,
    ) -> Result<git::commit::Sha, Box<dyn std::error::Error>> {
        let main_ref = fs
            .base()
            .join(gitdir.to_path_buf())
            .join(".git")
            .join("refs")
            .join("heads")
            .join(branch_name.to_string().as_str());
        let sha = fs.file_read_to_string(&main_ref)?;
        Ok(git::commit::Sha::new(sha.trim().to_string()))
    }
}