import os
import re
import argparse
import tempfile
import tarfile
import zipfile

import gitlab


class Gitlab(object):
    JOB_NAME_PATTERN = re.compile(r"(\w+)(\s+(\d+)/(\d+))?")

    def __init__(self, project_id=None):
        config_data_from_env = os.getenv("PYTHON_GITLAB_CONFIG")
        if config_data_from_env:
            # prefer to load config from env variable
            with tempfile.NamedTemporaryFile("w", delete=False) as temp_file:
                temp_file.write(config_data_from_env)
            config_files = [temp_file.name]
        else:
            # otherwise try to use config file at local filesystem
            config_files = None
        self.gitlab_inst = gitlab.Gitlab.from_config(config_files=config_files)
        self.gitlab_inst.auth()
        if project_id:
            self.project = self.gitlab_inst.projects.get(project_id)
        else:
            self.project = None

    def get_project_id(self, name, namespace=None):
        """
        search project ID by name

        :param name: project name
        :param namespace: namespace to match when we have multiple project with same name
        :return: project ID
        """
        projects = self.gitlab_inst.projects.list(search=name)
        res = []
        for project in projects:
            if namespace is None:
                if len(projects) == 1:
                    res.append(project.id)
                    break

            if project.namespace["path"] == namespace:
                if project.name == name:
                    res.insert(0, project.id)
                else:
                    res.append(project.id)

        if not res:
            raise ValueError("Can't find project")
        return res[0]

    def download_artifacts(self, job_id, destination):
        """
        download full job artifacts and extract to destination.

        :param job_id: Gitlab CI job ID
        :param destination: extract artifacts to path.
        """
        job = self.project.jobs.get(job_id)

        with tempfile.NamedTemporaryFile(delete=False) as temp_file:
            job.artifacts(streamed=True, action=temp_file.write)

        with zipfile.ZipFile(temp_file.name, "r") as archive_file:
            archive_file.extractall(destination)

    def download_artifact(self, job_id, artifact_path, destination=None):
        """
        download specific path of job artifacts and extract to destination.

        :param job_id: Gitlab CI job ID
        :param artifact_path: list of path in artifacts (relative path to artifact root path)
        :param destination: destination of artifact. Do not save to file if destination is None
        :return: A list of artifact file raw data.
        """
        job = self.project.jobs.get(job_id)

        raw_data_list = []

        for a_path in artifact_path:
            try:
                data = job.artifact(a_path)
            except gitlab.GitlabGetError as e:
                print("Failed to download '{}' form job {}".format(a_path, job_id))
                raise e
            raw_data_list.append(data)
            if destination:
                file_path = os.path.join(destination, a_path)
                try:
                    os.makedirs(os.path.dirname(file_path))
                except OSError:
                    # already exists
                    pass
                with open(file_path, "wb") as f:
                    f.write(data)

        return raw_data_list

    def find_job_id(self, job_name, pipeline_id=None, job_status="success"):
        """
        Get Job ID from job name of specific pipeline

        :param job_name: job name
        :param pipeline_id: If None, will get pipeline id from CI pre-defined variable.
        :param job_status: status of job. One pipeline could have multiple jobs with same name after retry.
                           job_status is used to filter these jobs.
        :return: a list of job IDs (parallel job will generate multiple jobs)
        """
        job_id_list = []
        if pipeline_id is None:
            pipeline_id = os.getenv("CI_PIPELINE_ID")
        pipeline = self.project.pipelines.get(pipeline_id)
        jobs = pipeline.jobs.list(all=True)
        for job in jobs:
            match = self.JOB_NAME_PATTERN.match(job.name)
            if match:
                if match.group(1) == job_name and job.status == job_status:
                    job_id_list.append({"id": job.id, "parallel_num": match.group(3)})
        return job_id_list

    def download_archive(self, ref, destination, project_id=None):
        """
        Download archive of certain commit of a repository and extract to destination path

        :param ref: commit or branch name
        :param destination: destination path of extracted archive file
        :param project_id: download project of current instance if project_id is None
        :return: root path name of archive file
        """
        if project_id is None:
            project = self.project
        else:
            project = self.gitlab_inst.projects.get(project_id)

        with tempfile.NamedTemporaryFile(delete=False) as temp_file:
            try:
                project.repository_archive(sha=ref, streamed=True, action=temp_file.write)
            except gitlab.GitlabGetError as e:
                print("Failed to archive from project {}".format(project_id))
                raise e

        print("archive size: {:.03f}MB".format(float(os.path.getsize(temp_file.name)) / (1024 * 1024)))

        with tarfile.open(temp_file.name, "r") as archive_file:
            root_name = archive_file.getnames()[0]
            archive_file.extractall(destination)

        return os.path.join(os.path.realpath(destination), root_name)


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument("action")
    parser.add_argument("project_id", type=int)
    parser.add_argument("--pipeline_id", "-i", type=int, default=None)
    parser.add_argument("--ref", "-r", default="master")
    parser.add_argument("--job_id", "-j", type=int, default=None)
    parser.add_argument("--job_name", "-n", default=None)
    parser.add_argument("--project_name", "-m", default=None)
    parser.add_argument("--destination", "-d", default=None)
    parser.add_argument("--artifact_path", "-a", nargs="*", default=None)
    args = parser.parse_args()

    gitlab_inst = Gitlab(args.project_id)
    if args.action == "download_artifacts":
        gitlab_inst.download_artifacts(args.job_id, args.destination)
    if args.action == "download_artifact":
        gitlab_inst.download_artifact(args.job_id, args.artifact_path, args.destination)
    elif args.action == "find_job_id":
        job_ids = gitlab_inst.find_job_id(args.job_name, args.pipeline_id)
        print(";".join([",".join([str(j["id"]), j["parallel_num"]]) for j in job_ids]))
    elif args.action == "download_archive":
        gitlab_inst.download_archive(args.ref, args.destination)
    elif args.action == "get_project_id":
        ret = gitlab_inst.get_project_id(args.project_name)
        print("project id: {}".format(ret))
