import importlib.util
import json
import os
import sys
import tempfile
import types
import unittest
from pathlib import Path

MODULE_PATH = Path(__file__).with_name("main.py")


class FakeDB:
    storages = {}

    def create_storage(self, name, purpose=None):
        self.storages.setdefault(name, {})

    def set(self, storage, key, value):
        self.storages.setdefault(storage, {})[key] = value

    def get(self, storage, key):
        return self.storages.get(storage, {}).get(key)

    def list_items(self, storage):
        return list(self.storages.get(storage, {}).keys())

    def delete_item(self, storage, key):
        self.storages.get(storage, {}).pop(key, None)


class ContactApiTests(unittest.TestCase):
    def setUp(self):
        FakeDB.storages = {}
        self.temp_dir = tempfile.TemporaryDirectory()
        self.rate_limit_file = os.path.join(self.temp_dir.name, "ratelimit.json")
        os.environ["LUNAS_KEY"] = "topsecret"
        self.module = self._load_module()
        self.module.RATE_LIMIT_FILE = self.rate_limit_file

    def tearDown(self):
        self.temp_dir.cleanup()
        os.environ.pop("LUNAS_KEY", None)
        sys.modules.pop("contact_api_main_under_test", None)
        sys.modules.pop("_db_com", None)

    def _load_module(self):
        fake_db_module = types.ModuleType("_db_com")
        fake_db_module.database = FakeDB
        sys.modules["_db_com"] = fake_db_module

        spec = importlib.util.spec_from_file_location("contact_api_main_under_test", MODULE_PATH)
        module = importlib.util.module_from_spec(spec)
        assert spec.loader is not None
        spec.loader.exec_module(module)
        return module

    def _res(self, response):
        return response["_res"]

    def test_submit_message_persists_record(self):
        response = self.module.main(
            {
                "method": "POST",
                "headers": {"origin": "https://luna.reversed.dev", "user-agent": "pytest"},
                "body": json.dumps(
                    {
                        "username": "Space",
                        "email": "space@example.com",
                        "message": "Hello Luna, this is a valid test message.",
                    }
                ),
            }
        )

        self.assertEqual(response["_code"], 201)
        payload = self._res(response)
        self.assertTrue(payload["ok"])
        stored = FakeDB.storages["portfolio_contact_messages"][payload["id"]]
        record = json.loads(stored)
        self.assertEqual(record["username"], "Space")
        self.assertFalse(record["seen"])

    def test_new_route_requires_key(self):
        response = self.module.main({"method": "GET", "route": "new", "headers": {}})
        self.assertEqual(response["_code"], 401)
        self.assertFalse(self._res(response)["ok"])

    def test_new_seen_and_delete_flow(self):
        created = self.module.main(
            {
                "method": "POST",
                "headers": {"origin": "https://luna.reversed.dev"},
                "body": json.dumps(
                    {
                        "username": "Space",
                        "email": "space@example.com",
                        "message": "Hello Luna, this should show up in the admin inbox.",
                    }
                ),
            }
        )
        message_id = self._res(created)["id"]

        auth_headers = {"x-lunas-key": "topsecret", "origin": "https://luna.reversed.dev"}
        listed = self.module.main({"method": "GET", "route": "new", "headers": auth_headers})
        self.assertEqual(listed["_code"], 200)
        self.assertEqual(self._res(listed)["count"], 1)
        self.assertEqual(self._res(listed)["messages"][0]["id"], message_id)

        seen = self.module.main(
            {
                "method": "POST",
                "route": "seen",
                "headers": auth_headers,
                "body": json.dumps({"id": message_id}),
            }
        )
        self.assertEqual(seen["_code"], 200)
        self.assertEqual(self._res(seen)["updated"], [message_id])

        listed_after_seen = self.module.main({"method": "GET", "route": "new", "headers": auth_headers})
        self.assertEqual(self._res(listed_after_seen)["count"], 0)

        deleted = self.module.main(
            {
                "method": "POST",
                "route": "delete",
                "headers": auth_headers,
                "body": json.dumps({"id": message_id}),
            }
        )
        self.assertEqual(deleted["_code"], 200)
        self.assertEqual(self._res(deleted)["deleted"], [message_id])

    def test_rate_limit_returns_retry_after(self):
        payload = {
            "username": "Space",
            "email": "space@example.com",
            "message": "Hello Luna, this message is long enough to pass validation.",
        }
        args = {
            "method": "POST",
            "headers": {"x-forwarded-for": "1.2.3.4", "origin": "https://luna.reversed.dev"},
            "body": json.dumps(payload),
        }

        for _ in range(self.module.RATE_LIMIT_MAX_REQUESTS):
            response = self.module.main(args)
            self.assertEqual(response["_code"], 201)

        limited = self.module.main(args)
        self.assertEqual(limited["_code"], 429)
        self.assertIn("Retry-After", limited["_headers"])


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