from unittest.mock import patch
from scripts.git_diff import changed_files, changed_dirs, changed_line_ranges


_DIFF = """\
diff --git a/live/prod/app/main.tf b/live/prod/app/main.tf
index abc..def 100644
--- a/live/prod/app/main.tf
+++ b/live/prod/app/main.tf
@@ -12 +12,2 @@
-  acl = "old"
+  acl = "new"
+  versioning = true
diff --git a/modules/app-role/main.tf b/modules/app-role/main.tf
index 111..222 100644
--- a/modules/app-role/main.tf
+++ b/modules/app-role/main.tf
@@ -5,0 +6,2 @@
+  name = "x"
+  assume_role_policy = "..."
diff --git a/README.md b/README.md
index 333..444 100644
--- a/README.md
+++ b/README.md
@@ -1 +1 @@
-old
+new
"""


def _fake_run(args, **kwargs):
    class R:
        returncode = 0
        stdout = _DIFF
        stderr = ""
    return R()


def test_changed_files_filters_tf_hcl():
    with patch("subprocess.run", side_effect=_fake_run):
        files = changed_files("/repo", "main", "HEAD")
    assert "live/prod/app/main.tf" in files
    assert "modules/app-role/main.tf" in files
    assert "README.md" not in files


def test_changed_dirs_dedupes():
    with patch("subprocess.run", side_effect=_fake_run):
        dirs = changed_dirs("/repo", "main", "HEAD")
    assert dirs == {"live/prod/app", "modules/app-role"}


def test_changed_line_ranges_parses_hunks():
    with patch("subprocess.run", side_effect=_fake_run):
        ranges = changed_line_ranges("/repo", "main", "HEAD",
                                     "live/prod/app/main.tf")
    assert ranges == [(12, 13)]


def test_changed_line_ranges_unknown_file():
    with patch("subprocess.run", side_effect=_fake_run):
        ranges = changed_line_ranges("/repo", "main", "HEAD", "no/such.tf")
    assert ranges == []