from unittest.mock import patch, MagicMock

from scripts.plan_runner import detect_tool, run_init, run_plan, extract_summary


def test_detect_tool_terragrunt(tmp_path):
    (tmp_path / "terragrunt.hcl").write_text("# tg\n")
    assert detect_tool(tmp_path) == "terragrunt"


def test_detect_tool_tofu(tmp_path):
    (tmp_path / "main.tf").write_text("# tf\n")
    assert detect_tool(tmp_path) == "tofu"


def test_extract_summary_finds_plan_line():
    output = """\
Terraform will perform the following actions:

  # aws_s3_bucket.x will be created
  + resource "aws_s3_bucket" "x" {
      bucket = "y"
    }

Plan: 1 to add, 0 to change, 0 to destroy.
"""
    assert extract_summary(output) == "1 to add, 0 to change, 0 to destroy"


def test_extract_summary_no_changes():
    output = "No changes. Your infrastructure matches the configuration.\n"
    assert extract_summary(output) == "no changes"


def test_run_init_ok(tmp_path):
    (tmp_path / "main.tf").write_text("# tf\n")
    fake = MagicMock(returncode=0, stdout="Initializing...\nok\n", stderr="")
    with patch("subprocess.run", return_value=fake) as p:
        result = run_init(tmp_path, "tofu")
    assert result.ok is True
    assert "ok" in result.stdout_tail
    p.assert_called_once()
    args = p.call_args[0][0]
    assert args[0] == "tofu"
    assert "init" in args


def test_run_init_failure_records_stderr(tmp_path):
    (tmp_path / "main.tf").write_text("# tf\n")
    fake = MagicMock(returncode=1, stdout="", stderr="provider not found\n")
    with patch("subprocess.run", return_value=fake):
        result = run_init(tmp_path, "tofu")
    assert result.ok is False
    assert "provider not found" in result.stderr_tail


def test_run_plan_streams_to_file(tmp_path):
    out_path = tmp_path / "plan.txt"
    fake = MagicMock(returncode=0,
                     stdout="Plan: 2 to add, 0 to change, 0 to destroy.\n",
                     stderr="")
    with patch("subprocess.run", return_value=fake):
        result = run_plan(tmp_path, "tofu", out_path)
    assert result.ok is True
    assert result.exit_code == 0
    assert result.summary == "2 to add, 0 to change, 0 to destroy"
    assert out_path.read_text().endswith("0 to destroy.\n")