from io import StringIO

from django.core.cache import cache
from django.core.management import call_command
from django.test import TestCase, override_settings
from django.utils import timezone
from rest_framework.test import APIClient

from api_v1.models import AppVersion
from flower.app_version import APP_VERSION_CACHE_KEY


class AppVersionAPITest(TestCase):
    def setUp(self):
        cache.delete(APP_VERSION_CACHE_KEY)
        self.client = APIClient()

    def tearDown(self):
        cache.delete(APP_VERSION_CACHE_KEY)

    @override_settings(
        APP_LATEST_VERSION_MAJOR=1,
        APP_LATEST_VERSION_MINOR=2,
        APP_LATEST_VERSION_BUILD=345,
        APP_DOWNLOAD_URL="https://example.com/app.apk",
        APP_FORCE_UPDATE=True,
        APP_PUBLISH_DATE="2026-07-08",
    )
    def test_app_version_api_returns_settings_payload_without_auth(self):
        response = self.client.get("/api/app-version/")

        self.assertEqual(response.status_code, 200)
        self.assertEqual(
            response.data,
            {
                "latest_version": {
                    "major": 1,
                    "minor": 2,
                    "build": 345,
                },
                "download_url": "https://example.com/app.apk",
                "force": True,
                "publish_date": "2026-07-08",
                "message": "",
            },
        )

    def test_app_version_api_returns_current_model_version(self):
        AppVersion.objects.create(
            major=1,
            minor=0,
            build=100,
            download_url="https://example.com/old.apk",
            publish_date="2026-07-01",
            message="旧版本",
        )
        AppVersion.objects.create(
            major=2,
            minor=0,
            build=200,
            download_url="https://example.com/current.apk",
            force=True,
            publish_date="2026-07-08",
            message="请更新到最新版本",
            is_current=True,
        )

        response = self.client.get("/api/app-version/")

        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.data["latest_version"], {"major": 2, "minor": 0, "build": 200})
        self.assertEqual(response.data["download_url"], "https://example.com/current.apk")
        self.assertEqual(response.data["force"], True)
        self.assertEqual(response.data["publish_date"], "2026-07-08")
        self.assertEqual(response.data["message"], "请更新到最新版本")

    def test_app_version_api_returns_newest_model_version_when_no_current(self):
        AppVersion.objects.create(
            major=1,
            minor=0,
            build=100,
            download_url="https://example.com/old.apk",
            publish_date="2026-07-01",
        )
        AppVersion.objects.create(
            major=1,
            minor=1,
            build=110,
            download_url="https://example.com/new.apk",
            publish_date="2026-07-02",
            message="最新创建版本",
        )

        response = self.client.get("/api/app-version/")

        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.data["latest_version"], {"major": 1, "minor": 1, "build": 110})
        self.assertEqual(response.data["download_url"], "https://example.com/new.apk")
        self.assertEqual(response.data["message"], "最新创建版本")

    def test_app_version_current_flag_is_mutually_exclusive(self):
        first = AppVersion.objects.create(
            major=1,
            minor=0,
            build=100,
            download_url="https://example.com/first.apk",
            is_current=True,
        )
        second = AppVersion.objects.create(
            major=2,
            minor=0,
            build=200,
            download_url="https://example.com/second.apk",
            is_current=True,
        )

        first.refresh_from_db()
        second.refresh_from_db()
        self.assertFalse(first.is_current)
        self.assertTrue(second.is_current)

    def test_set_app_version_command_updates_cached_api_payload_with_defaults(self):
        output = StringIO()
        call_command(
            "set_app_version",
            "--major",
            "2",
            "--minor",
            "5",
            "--build",
            "1001",
            "--download-url",
            "https://example.com/latest.apk",
            stdout=output,
        )

        response = self.client.get("/api/app-version/")

        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.data["latest_version"], {"major": 2, "minor": 5, "build": 1001})
        self.assertEqual(response.data["download_url"], "https://example.com/latest.apk")
        self.assertEqual(response.data["force"], False)
        self.assertEqual(response.data["publish_date"], timezone.localdate().isoformat())
        self.assertEqual(response.data["message"], "")
        self.assertIn("'build': 1001", output.getvalue())

    def test_set_app_version_command_accepts_force_and_publish_date(self):
        output = StringIO()
        call_command(
            "set_app_version",
            "--major",
            "2",
            "--minor",
            "6",
            "--build",
            "1002",
            "--download-url",
            "https://example.com/force.apk",
            "--force",
            "--publish-date",
            "2026-07-01",
            "--message",
            "强制升级说明",
            stdout=output,
        )

        response = self.client.get("/api/app-version/")

        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.data["latest_version"], {"major": 2, "minor": 6, "build": 1002})
        self.assertEqual(response.data["download_url"], "https://example.com/force.apk")
        self.assertEqual(response.data["force"], True)
        self.assertEqual(response.data["publish_date"], "2026-07-01")
        self.assertEqual(response.data["message"], "强制升级说明")