"""
Test for Bug #65 fix: OperationalError (1366) Incorrect string value for emoji in prompt.

Verifies that GenerationRecord.prompt can store 4-byte UTF-8 characters (emoji).
"""

import os
import sys
import django

# Setup Django
sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'backend'))
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'config.settings')
os.environ.setdefault('TESTING', 'true')
django.setup()

from django.test import TestCase
from django.contrib.auth import get_user_model
from apps.generation.models import GenerationRecord

User = get_user_model()


class Bug65EmojiPromptTest(TestCase):
    """Test that prompts with emoji characters can be saved to the database."""

    def setUp(self):
        self.user = User.objects.create_user(
            username='testuser_bug65',
            email='bug65@test.com',
            password='testpass123',
        )

    def test_prompt_with_emoji_saves_successfully(self):
        """Bug #65: prompt containing 🔊 (4-byte UTF-8) should not raise OperationalError."""
        emoji_prompt = '🔊 这是一个包含emoji的提示词 🎬🎥✨'
        record = GenerationRecord.objects.create(
            user=self.user,
            prompt=emoji_prompt,
            mode='universal',
            model='seedance_2.0',
            aspect_ratio='16:9',
            duration=5,
        )
        record.refresh_from_db()
        self.assertEqual(record.prompt, emoji_prompt)

    def test_prompt_with_mixed_unicode(self):
        """Prompt with mixed CJK + emoji + ASCII should save correctly."""
        mixed_prompt = '🔊 大象在草原上奔跑 🐘 — cinematic 4K, slow-motion 🎬'
        record = GenerationRecord.objects.create(
            user=self.user,
            prompt=mixed_prompt,
            mode='universal',
            model='seedance_2.0',
            aspect_ratio='16:9',
            duration=5,
        )
        record.refresh_from_db()
        self.assertEqual(record.prompt, mixed_prompt)

    def test_prompt_with_only_basic_text(self):
        """Ensure basic text still works after the charset change."""
        basic_prompt = '一只猫在跑步'
        record = GenerationRecord.objects.create(
            user=self.user,
            prompt=basic_prompt,
            mode='universal',
            model='seedance_2.0',
            aspect_ratio='16:9',
            duration=5,
        )
        record.refresh_from_db()
        self.assertEqual(record.prompt, basic_prompt)

    def test_settings_mysql_charset(self):
        """Verify MySQL OPTIONS includes utf8mb4 charset and SET NAMES utf8mb4."""
        from django.conf import settings
        # Only check if MySQL config is present (prod uses MySQL, test uses SQLite)
        db_config = settings.DATABASES.get('default', {})
        if db_config.get('ENGINE', '').endswith('mysql'):
            options = db_config.get('OPTIONS', {})
            self.assertEqual(options.get('charset'), 'utf8mb4')
            self.assertIn('SET NAMES utf8mb4', options.get('init_command', ''))