import copy
import importlib.util
from pathlib import Path
from typing import List

from praktika import Workflow

from . import Job
from .settings import Settings
from .utils import Utils


def _get_workflows(name=None, file=None) -> List[Workflow.Config]:
    """
    Gets user's workflow configs
    """
    res = []

    directory = Path(Settings.WORKFLOWS_DIRECTORY)
    for py_file in directory.glob("*.py"):
        if file and file not in str(py_file):
            continue
        module_name = py_file.name.removeprefix(".py")
        spec = importlib.util.spec_from_file_location(
            module_name, f"{Settings.WORKFLOWS_DIRECTORY}/{module_name}"
        )
        assert spec
        foo = importlib.util.module_from_spec(spec)
        assert spec.loader
        spec.loader.exec_module(foo)
        try:
            for workflow in foo.WORKFLOWS:
                if name:
                    if name == workflow.name:
                        print(f"Read workflow [{name}] config from [{module_name}]")
                        res = [workflow]
                        break
                    else:
                        continue
                else:
                    res += foo.WORKFLOWS
                    print(f"Read workflow configs from [{module_name}]")
        except Exception as e:
            print(
                f"WARNING: Failed to add WORKFLOWS config from [{module_name}], exception [{e}]"
            )
    if not res:
        Utils.raise_with_error(f"Failed to find workflow [{name or file}]")

    for workflow in res:
        # add native jobs
        _update_workflow_with_native_jobs(workflow)
        # fill in artifact properties, e.g. _provided_by
        _update_workflow_artifacts(workflow)
    return res


def _update_workflow_artifacts(workflow):
    artifact_job = {}
    for job in workflow.jobs:
        for artifact_name in job.provides:
            artifact_job[artifact_name] = job.name
    for artifact in workflow.artifacts:
        artifact._provided_by = artifact_job[artifact.name]


def _update_workflow_with_native_jobs(workflow):
    if workflow.dockers:
        from .native_jobs import _docker_build_job

        print(f"Enable native job [{_docker_build_job.name}] for [{workflow.name}]")
        aux_job = copy.deepcopy(_docker_build_job)
        if workflow.enable_cache:
            print(f"Add automatic digest config for [{aux_job.name}] job")
            docker_digest_config = Job.CacheDigestConfig()
            for docker_config in workflow.dockers:
                docker_digest_config.include_paths.append(docker_config.path)
            aux_job.digest_config = docker_digest_config

        workflow.jobs.insert(0, aux_job)
        for job in workflow.jobs[1:]:
            if not job.requires:
                job.requires = []
            job.requires.append(aux_job.name)

    if (
        workflow.enable_cache
        or workflow.enable_report
        or workflow.enable_merge_ready_status
    ):
        from .native_jobs import _workflow_config_job

        print(f"Enable native job [{_workflow_config_job.name}] for [{workflow.name}]")
        aux_job = copy.deepcopy(_workflow_config_job)
        workflow.jobs.insert(0, aux_job)
        for job in workflow.jobs[1:]:
            if not job.requires:
                job.requires = []
            job.requires.append(aux_job.name)

    if workflow.enable_merge_ready_status:
        from .native_jobs import _final_job

        print(f"Enable native job [{_final_job.name}] for [{workflow.name}]")
        aux_job = copy.deepcopy(_final_job)
        for job in workflow.jobs:
            aux_job.requires.append(job.name)
        workflow.jobs.append(aux_job)