# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""Tests for the case directory: creation, manifest round trip, atomic saves."""

import json
import pathlib
import tempfile
import unittest

from abusectl import case


class TestCaseCreation(unittest.TestCase):
    def setUp(self):
        self._tmp = tempfile.TemporaryDirectory()
        self.root = pathlib.Path(self._tmp.name)

    def tearDown(self):
        self._tmp.cleanup()

    def test_a_case_holds_the_source_and_a_manifest(self):
        created = case.create(self.root, b"From: <a@b.example.invalid>\r\n\r\nhi")
        self.assertTrue((created.path / "source.eml").is_file())
        self.assertTrue((created.path / "manifest.json").is_file())

    def test_the_source_is_stored_byte_for_byte(self):
        raw = b"From: <a@b.example.invalid>\r\n\r\nhi\r\n"
        created = case.create(self.root, raw)
        self.assertEqual((created.path / "source.eml").read_bytes(), raw)

    def test_the_manifest_carries_a_format_version(self):
        created = case.create(self.root, b"x")
        manifest = json.loads((created.path / "manifest.json").read_text())
        self.assertEqual(manifest["format"], case.FORMAT_VERSION)

    def test_two_cases_do_not_collide(self):
        a = case.create(self.root, b"one")
        b = case.create(self.root, b"two")
        self.assertNotEqual(a.path, b.path)

    def test_a_case_id_is_filesystem_safe(self):
        created = case.create(self.root, b"x")
        self.assertRegex(created.path.name, r"^\d{4}-\d{2}-\d{2}-[0-9a-f]{4}$")

    def test_a_manifest_round_trips(self):
        created = case.create(self.root, b"x")
        manifest = case.load(created.path)
        manifest["iocs"] = [{"id": "ioc-1", "type": "ipv4", "value": "203.0.113.1"}]
        case.save(created.path, manifest)
        self.assertEqual(case.load(created.path)["iocs"][0]["value"], "203.0.113.1")

    def test_saving_leaves_no_temporary_file_behind(self):
        # The manifest is written atomically, temp file plus rename, because a
        # half-written manifest during a review is a corrupted evidence record.
        created = case.create(self.root, b"x")
        case.save(created.path, case.load(created.path))
        leftovers = [p.name for p in created.path.iterdir() if p.suffix == ".tmp"]
        self.assertEqual(leftovers, [])

    def test_an_unknown_manifest_format_is_refused(self):
        # A newer writer may mean fields this build would silently drop on the
        # next save, so refusing is correct rather than cautious.
        created = case.create(self.root, b"x")
        manifest = case.load(created.path)
        manifest["format"] = case.FORMAT_VERSION + 1
        (created.path / "manifest.json").write_text(json.dumps(manifest))
        with self.assertRaises(ValueError):
            case.load(created.path)

    def test_a_failed_save_leaves_the_existing_manifest_intact(self):
        # An evidence record must not be destroyed by a write that fails.
        created = case.create(self.root, b"x")
        good = case.load(created.path)
        good["iocs"] = [{"id": "ioc-1"}]
        case.save(created.path, good)

        class Unserialisable:
            pass

        with self.assertRaises(TypeError):
            case.save(created.path, {"format": case.FORMAT_VERSION,
                                     "bad": Unserialisable()})

        self.assertEqual(case.load(created.path)["iocs"], [{"id": "ioc-1"}])
        leftovers = [p.name for p in created.path.iterdir() if p.suffix == ".tmp"]
        self.assertEqual(leftovers, [])


if __name__ == "__main__":
    unittest.main()