import subprocess
from dataclasses import dataclass
from unittest.mock import MagicMock

import pytest

from poetry_slam.build_tool import BuildError, BuildTool


def result_factory(out: bytes = b"", err: bytes = b"", code: int = 0):
    @dataclass
    class returnval:
        stdout: bytes = out
        stderr: bytes = err
        returncode: int = code

    return MagicMock(spec=subprocess, **{"run.return_value": returnval()})


@pytest.mark.parametrize(
    "out, err, returncode, exception_type",
    [
        (b"", b"", 0, None),
        (b"", b"some error", 1, BuildError),
    ],
)
def test_slam(monkeypatch, out, err, returncode, exception_type):
    monkeypatch.setattr("poetry_slam.build_tool.subprocess", result_factory(out, err, returncode))
    try:
        assert BuildTool().build() == returncode
    except exception_type:
        pass


def test_format(monkeypatch):
    monkeypatch.setattr("poetry_slam.build_tool.subprocess", result_factory())
    assert BuildTool().auto_format() == 0


def test_install(monkeypatch):
    monkeypatch.setattr("poetry_slam.build_tool.subprocess", result_factory())
    assert BuildTool().install() == 0


def test_test(monkeypatch):
    monkeypatch.setattr("poetry_slam.build_tool.subprocess", result_factory(out=b"out", err=b"err", code=0))
    assert BuildTool(verbose=True).test([]) == 0


def test_run_hook_executes_script(monkeypatch, tmp_path):
    """Hook script exists and is executable — it should be run."""
    hooks_dir = tmp_path / ".slam" / "hooks"
    hooks_dir.mkdir(parents=True)
    hook = hooks_dir / "pre_build"
    hook.write_text("#!/bin/sh\nexit 0\n")
    hook.chmod(0o755)

    mock_sub = result_factory()
    monkeypatch.setattr("poetry_slam.build_tool.subprocess", mock_sub)
    bt = BuildTool(project_root=tmp_path)
    bt.run_hook("pre_build")
    mock_sub.run.assert_called_once()


def test_run_hook_skips_missing(monkeypatch, tmp_path):
    """No hook script — run_hook should do nothing."""
    mock_sub = result_factory()
    monkeypatch.setattr("poetry_slam.build_tool.subprocess", mock_sub)
    bt = BuildTool(project_root=tmp_path)
    bt.run_hook("pre_build")
    mock_sub.run.assert_not_called()


def test_run_hook_non_executable_raises(monkeypatch, tmp_path):
    """Hook script exists but is not executable — should raise BuildError."""
    hooks_dir = tmp_path / ".slam" / "hooks"
    hooks_dir.mkdir(parents=True)
    hook = hooks_dir / "pre_build"
    hook.write_text("#!/bin/sh\nexit 0\n")
    hook.chmod(0o644)

    monkeypatch.setattr("poetry_slam.build_tool.subprocess", result_factory(err=b"permission denied", code=126))
    bt = BuildTool(project_root=tmp_path)
    with pytest.raises(BuildError):
        bt.run_hook("pre_build")


def test_run_hook_raises_on_failure(monkeypatch, tmp_path):
    """Hook script fails — should raise BuildError."""
    hooks_dir = tmp_path / ".slam" / "hooks"
    hooks_dir.mkdir(parents=True)
    hook = hooks_dir / "pre_build"
    hook.write_text("#!/bin/sh\nexit 1\n")
    hook.chmod(0o755)

    monkeypatch.setattr("poetry_slam.build_tool.subprocess", result_factory(err=b"hook failed", code=1))
    bt = BuildTool(project_root=tmp_path)
    with pytest.raises(BuildError):
        bt.run_hook("pre_build")


def test_build_runs_hooks(monkeypatch, tmp_path):
    """Build pipeline should call run_hook for each stage."""
    mock_sub = result_factory()
    monkeypatch.setattr("poetry_slam.build_tool.subprocess", mock_sub)
    bt = BuildTool(project_root=tmp_path)

    hook_calls = []
    original_run_hook = bt.run_hook

    def tracking_run_hook(stage):
        hook_calls.append(stage)
        original_run_hook(stage)

    bt.run_hook = tracking_run_hook
    bt.build()

    assert hook_calls == [
        "pre_format",
        "post_format",
        "pre_install",
        "post_install",
        "pre_test",
        "post_test",
        "pre_build",
        "post_build",
    ]


def test_hooks_dir_property(tmp_path):
    """hooks_dir should point to .slam/hooks/ under project_root."""
    bt = BuildTool(project_root=tmp_path)
    assert bt.hooks_dir == tmp_path / ".slam" / "hooks"