# SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
# SPDX-License-Identifier: Apache-2.0

import io
import typing as t
from contextlib import redirect_stdout
from pathlib import Path

import pytest
from _pytest.config import ExitCode
from idf_py_actions.constants import PREVIEW_TARGETS as TOOLS_PREVIEW_TARGETS
from idf_py_actions.constants import SUPPORTED_TARGETS as TOOLS_SUPPORTED_TARGETS
from pytest_embedded.utils import to_list

from .constants import CollectMode, PytestCase
from .plugin import IdfPytestEmbedded


def get_pytest_files(paths: t.List[str]) -> t.List[str]:
    # this is a workaround to solve pytest collector super slow issue
    # benchmark with
    # - time pytest -m esp32 --collect-only
    #   user=15.57s system=1.35s cpu=95% total=17.741
    # - time { find -name 'pytest_*.py'; } | xargs pytest -m esp32 --collect-only
    #   user=0.11s system=0.63s cpu=36% total=2.044
    #   user=1.76s system=0.22s cpu=43% total=4.539
    # use glob.glob would also save a bunch of time
    pytest_scripts: t.Set[str] = set()
    for p in paths:
        path = Path(p)
        pytest_scripts.update(str(_p) for _p in path.glob('**/pytest_*.py') if 'managed_components' not in _p.parts)

    return list(pytest_scripts)


def get_pytest_cases(
    paths: t.Union[str, t.List[str]],
    target: str = CollectMode.ALL,
    marker_expr: t.Optional[str] = None,
    filter_expr: t.Optional[str] = None,
) -> t.List[PytestCase]:
    """
    For single-dut test cases, `target` could be
    - [TARGET], e.g. `esp32`, to get the test cases for the given target
    - or `single_all`, to get all single-dut test cases

    For multi-dut test cases, `target` could be
    - [TARGET,[TARGET...]], e.g. `esp32,esp32s2`, to get the test cases for the given targets
    - or `multi_all`, to get all multi-dut test cases

    :param paths: paths to search for pytest scripts
    :param target: target to get test cases for, detailed above
    :param marker_expr: pytest marker expression, `-m`
    :param filter_expr: pytest filter expression, `-k`
    :return: list of test cases
    """
    paths = to_list(paths)

    cases: t.List[PytestCase] = []
    pytest_scripts = get_pytest_files(paths)  # type: ignore
    if not pytest_scripts:
        print(f'WARNING: no pytest scripts found for target {target} under paths {", ".join(paths)}')
        return cases

    def _get_pytest_cases(_target: str, _single_target_duplicate_mode: bool = False) -> t.List[PytestCase]:
        collector = IdfPytestEmbedded(_target, single_target_duplicate_mode=_single_target_duplicate_mode)

        with io.StringIO() as buf:
            with redirect_stdout(buf):
                cmd = ['--collect-only', *pytest_scripts, '--target', _target, '-q']
                if marker_expr:
                    cmd.extend(['-m', marker_expr])
                if filter_expr:
                    cmd.extend(['-k', filter_expr])
                res = pytest.main(cmd, plugins=[collector])

            if res.value != ExitCode.OK:
                if res.value == ExitCode.NO_TESTS_COLLECTED:
                    print(f'WARNING: no pytest app found for target {_target} under paths {", ".join(paths)}')
                else:
                    print(buf.getvalue())
                    raise RuntimeError(
                        f'pytest collection failed at {", ".join(paths)} with command \"{" ".join(cmd)}\"'
                    )

        return collector.cases  # type: ignore

    if target == CollectMode.ALL:
        targets = TOOLS_SUPPORTED_TARGETS + TOOLS_PREVIEW_TARGETS + [CollectMode.MULTI_ALL_WITH_PARAM]
    else:
        targets = [target]

    for _target in targets:
        if target == CollectMode.ALL:
            cases.extend(_get_pytest_cases(_target, _single_target_duplicate_mode=True))
        else:
            cases.extend(_get_pytest_cases(_target))

    return sorted(cases, key=lambda x: (x.path, x.name, str(x.targets)))