"""Tests for the installer: pure planning logic and the run_step executor."""

from __future__ import annotations

from pathlib import Path

import pytest

from sjaur.installer import (
    InstallStep,
    check_environment,
    plan_install,
    run_step,
)
from sjaur.errors import SjaurError


# -- plan_install (pure logic) ---------------------------------------------------


def test_plan_install_without_existing_clone(tmp_path):
    steps = plan_install("yay", tmp_path)
    assert steps == [
        InstallStep("clone", "yay"),
        InstallStep("makepkg", "yay"),
    ]


def test_plan_install_reuses_existing_clone(tmp_path):
    (tmp_path / "yay").mkdir()
    steps = plan_install("yay", tmp_path)
    assert steps == [
        InstallStep("reuse", "yay"),
        InstallStep("makepkg", "yay"),
    ]


def test_plan_install_refresh_updates_existing_clone(tmp_path):
    (tmp_path / "yay").mkdir()
    steps = plan_install("yay", tmp_path, refresh=True)
    assert steps == [
        InstallStep("update", "yay"),
        InstallStep("makepkg", "yay"),
    ]


def test_plan_install_refresh_clones_when_missing(tmp_path):
    steps = plan_install("yay", tmp_path, refresh=True)
    assert [step.kind for step in steps] == ["clone", "makepkg"]


def test_plan_install_repo_package_uses_pacman(tmp_path):
    for repository in ("core", "extra", "multilib"):
        steps = plan_install("firefox", tmp_path, repository=repository)
        assert steps == [InstallStep("pacman", "firefox")]


def test_run_step_pacman_uses_sudo_for_non_root(tmp_path, monkeypatch):
    import sjaur.installer as installer

    recorded = {}

    def fake_run(cmd, cwd=None, check=False):
        recorded["cmd"] = cmd

        class Result:
            returncode = 0

        return Result()

    monkeypatch.setattr(installer.subprocess, "run", fake_run)
    monkeypatch.setattr(installer.os, "geteuid", lambda: 1000)

    run_step(InstallStep("pacman", "firefox"), tmp_path)

    assert recorded["cmd"] == ["sudo", "pacman", "-S", "--needed", "firefox"]


def test_run_step_pacman_as_root_needs_no_sudo(tmp_path, monkeypatch):
    import sjaur.installer as installer

    recorded = {}

    def fake_run(cmd, cwd=None, check=False):
        recorded["cmd"] = cmd

        class Result:
            returncode = 0

        return Result()

    monkeypatch.setattr(installer.subprocess, "run", fake_run)
    monkeypatch.setattr(installer.os, "geteuid", lambda: 0)

    run_step(InstallStep("pacman", "firefox"), tmp_path)

    assert recorded["cmd"] == ["pacman", "-S", "--needed", "firefox"]


def test_check_environment_repo_packages_only_need_pacman(monkeypatch):
    import sjaur.installer as installer

    monkeypatch.setattr(
        installer.shutil,
        "which",
        lambda name: None if name in ("git", "makepkg") else "/usr/bin/pacman",
    )
    assert check_environment(include_build_tools=False) == []
    assert len(check_environment(include_build_tools=True)) == 2


# -- run_step (subprocess execution) ----------------------------------------------


def test_run_step_clone_creates_directory(tmp_path, monkeypatch):
    import subprocess

    import sjaur.installer as installer

    # Point the AUR URL template at a local bare repository: no network.
    source = tmp_path / "aur-mock"
    source.mkdir()
    subprocess.run(["git", "init", "-q", "--bare", str(source / "yay.git")], check=True)
    monkeypatch.setattr(installer, "AUR_GIT_URL", str(source / "{name}.git"))

    target_root = tmp_path / "builds"
    target_root.mkdir()
    run_step(InstallStep("clone", "yay"), target_root)

    assert (target_root / "yay" / ".git").is_dir()


def test_run_step_reuse_is_a_noop(tmp_path):
    (tmp_path / "whatever").mkdir()
    run_step(InstallStep("reuse", "whatever"), tmp_path)  # must not raise


def test_run_step_makepkg_without_pkgbuild_raises(tmp_path):
    (tmp_path / "pkg").mkdir()
    with pytest.raises(SjaurError) as excinfo:
        run_step(InstallStep("makepkg", "pkg"), tmp_path)
    assert "PKGBUILD" in str(excinfo.value)


def test_run_step_makepkg_failure_raises(tmp_path):
    pkg = tmp_path / "pkg"
    pkg.mkdir()
    (pkg / "PKGBUILD").write_text("pkgname=pkg\n")
    with pytest.raises(SjaurError) as excinfo:
        run_step(InstallStep("makepkg", "pkg"), tmp_path)
    assert "makepkg" in str(excinfo.value)


def test_run_step_unknown_kind_raises(tmp_path):
    with pytest.raises(SjaurError):
        run_step(InstallStep("explode", "pkg"), tmp_path)


# -- check_environment -------------------------------------------------------------


def test_check_environment_finds_basic_tools():
    # git/makepkg/pacman exist in CI-like Linux environments; if any is
    # missing the message names the tool.
    problems = check_environment()
    assert isinstance(problems, list)
    for problem in problems:
        assert "not found in PATH" in problem


def test_check_environment_reports_missing_tool(monkeypatch):
    import sjaur.installer as installer

    monkeypatch.setattr(installer.shutil, "which", lambda name: None)
    problems = check_environment()
    assert len(problems) == 3
    assert any("git" in problem for problem in problems)


def test_missing_binary_in_run_step_raises(tmp_path, monkeypatch):
    import sjaur.installer as installer

    def raise_missing(*args, **kwargs):
        raise FileNotFoundError("git")

    monkeypatch.setattr(installer.subprocess, "run", raise_missing)
    with pytest.raises(SjaurError) as excinfo:
        run_step(InstallStep("clone", "x"), tmp_path)
    assert "git" in str(excinfo.value)