# addons/itsulu_blog_publisher/tests/test_llm_router.py
"""
Tests for services/llm_router.py
Behaviour: route LLM calls to the correct provider, record token usage,
           raise UserError on unknown or misconfigured providers.

RED PHASE — all tests here FAIL until llm_router and provider services exist.
"""
import json
from unittest.mock import patch, MagicMock
from odoo.tests import TransactionCase, tagged
from odoo.exceptions import UserError
from .factories import BlogPublisherFactory


def _make_mock_llm_response(tokens_used=800):
    """Create a mock LLM response with valid JSON structure."""
    response_json = {
        "title": "Test Blog Post",
        "body_html": "<h1>Test</h1><p>Content here.</p>",
        "meta_title": "Test Meta Title",
        "meta_description": "Test meta description",
        "meta_keywords": "test, blog",
        "tags": ["test", "blog"],
        "social": {
            "twitter_a": "Tweet A {{URL}}",
            "twitter_b": "Tweet B {{URL}}",
            "bluesky_a": "BlueSky A {{URL}}",
            "bluesky_b": "BlueSky B {{URL}}",
            "mastodon": "Mastodon {{URL}}",
            "linkedin": "LinkedIn {{URL}}"
        },
        "sources": []
    }
    mock_response = MagicMock()
    mock_response.text = json.dumps(response_json)
    mock_response.tokens_used = tokens_used
    return mock_response


@tagged('post_install', '-at_install', 'itsulu_blog_publisher', 'llm_router')
class TestLLMRouterProviderDispatch(TransactionCase):
    """Verify that the LLM router dispatches to the correct backend provider."""

    @classmethod
    def setUpClass(cls):
        super().setUpClass()
        cls.factory = BlogPublisherFactory(cls.env)
        # Store a known-valid stub API key in ir.config_parameter
        cls.env['ir.config_parameter'].sudo().set_param(
            'itsulu_blog_publisher.anthropic_api_key', 'sk-ant-test-key'
        )
        cls.env['ir.config_parameter'].sudo().set_param(
            'itsulu_blog_publisher.openai_api_key', 'sk-openai-test-key'
        )
        cls.env['ir.config_parameter'].sudo().set_param(
            'itsulu_blog_publisher.gemini_api_key', 'gemini-test-key'
        )
        cls.env['ir.config_parameter'].sudo().set_param(
            'itsulu_blog_publisher.ollama_base_url', 'http://localhost:11434'
        )

    # --- Provider dispatch ---

    def test_anthropic_provider_calls_anthropic_endpoint(self):
        """
        1. Behaviour: router with provider='anthropic' calls AnthropicProvider.generate()
        2. ARRANGE: router instantiated with provider='anthropic'
        3. ACT: router.generate(prompt='Write a blog post about AI')
        4. ASSERT: AnthropicProvider.generate was called once; result is non-empty string
        5. FAIL reason: LLMRouter class does not exist yet
        """
        # ARRANGE
        from odoo.addons.itsulu_blog_publisher.services.llm_router import LLMRouter
        mock_response = _make_mock_llm_response(tokens_used=800)

        with patch(
            'odoo.addons.itsulu_blog_publisher.services.anthropic_provider'
            '.AnthropicProvider.generate',
            return_value=mock_response,
        ) as mock_generate:
            # ACT
            router = LLMRouter(self.env, provider='anthropic', model='claude-sonnet-4-20250514')
            result = router.generate(topic='Write a blog post about AI trends')

        # ASSERT
        mock_generate.assert_called_once()
        self.assertTrue(result.body_html, "Router must return non-empty body_html from Anthropic")

    def test_openai_provider_calls_openai_endpoint(self):
        """Router with provider='openai' delegates to OpenAIProvider.generate()."""
        from odoo.addons.itsulu_blog_publisher.services.llm_router import LLMRouter
        mock_response = _make_mock_llm_response(tokens_used=600)

        with patch(
            'odoo.addons.itsulu_blog_publisher.services.openai_provider'
            '.OpenAIProvider.generate',
            return_value=mock_response,
        ) as mock_generate:
            router = LLMRouter(self.env, provider='openai', model='gpt-4o')
            result = router.generate(topic='Write a blog post about cloud computing')

        mock_generate.assert_called_once()
        self.assertTrue(result.body_html)

    def test_gemini_provider_calls_gemini_endpoint(self):
        """Router with provider='gemini' delegates to GeminiProvider.generate()."""
        from odoo.addons.itsulu_blog_publisher.services.llm_router import LLMRouter
        mock_response = _make_mock_llm_response(tokens_used=700)

        with patch(
            'odoo.addons.itsulu_blog_publisher.services.gemini_provider'
            '.GeminiProvider.generate',
            return_value=mock_response,
        ) as mock_generate:
            router = LLMRouter(self.env, provider='gemini', model='gemini-2.0-flash')
            result = router.generate(topic='Write a blog post about automation')

        mock_generate.assert_called_once()
        self.assertTrue(result.body_html)

    def test_ollama_provider_calls_local_api_endpoint(self):
        """Router with provider='ollama' delegates to OllamaProvider.generate()."""
        from odoo.addons.itsulu_blog_publisher.services.llm_router import LLMRouter
        mock_response = _make_mock_llm_response(tokens_used=500)

        with patch(
            'odoo.addons.itsulu_blog_publisher.services.ollama_provider'
            '.OllamaProvider.generate',
            return_value=mock_response,
        ) as mock_generate:
            router = LLMRouter(self.env, provider='ollama', model='mistral')
            result = router.generate(topic='Write a blog post about open source AI')

        mock_generate.assert_called_once()
        self.assertTrue(result.body_html)

    def test_unknown_provider_raises_user_error(self):
        """
        Router with unrecognised provider must raise UserError immediately,
        before any network call is made.
        """
        from odoo.addons.itsulu_blog_publisher.services.llm_router import LLMRouter

        with self.assertRaises(UserError) as ctx:
            router = LLMRouter(self.env, provider='unknown_provider', model='some-model')
            router.generate(topic='This should fail')

        self.assertIn('not configured', str(ctx.exception).lower())

    def test_missing_api_key_raises_user_error(self):
        """Router raises UserError when required API key param is absent."""
        from odoo.addons.itsulu_blog_publisher.services.llm_router import LLMRouter
        # Remove the key
        self.env['ir.config_parameter'].sudo().set_param(
            'itsulu_blog_publisher.anthropic_api_key', ''
        )
        with self.assertRaises(UserError) as ctx:
            router = LLMRouter(self.env, provider='anthropic', model='claude-sonnet-4-20250514')
            router.generate(topic='Fail fast')

        self.assertIn('api key', str(ctx.exception).lower())
        # Restore for other tests
        self.env['ir.config_parameter'].sudo().set_param(
            'itsulu_blog_publisher.anthropic_api_key', 'sk-ant-test-key'
        )


@tagged('post_install', '-at_install', 'itsulu_blog_publisher', 'llm_router')
class TestLLMRouterTokenLogging(TransactionCase):
    """Verify that token usage is captured from provider responses."""

    @classmethod
    def setUpClass(cls):
        super().setUpClass()
        cls.factory = BlogPublisherFactory(cls.env)
        cls.env['ir.config_parameter'].sudo().set_param(
            'itsulu_blog_publisher.anthropic_api_key', 'sk-ant-test-key'
        )

    def test_router_response_includes_tokens_used(self):
        """
        The LLMResponse object returned by router.generate() must expose
        tokens_used as a positive integer when the API returns usage data.
        """
        from odoo.addons.itsulu_blog_publisher.services.llm_router import LLMRouter
        mock_response = _make_mock_llm_response(tokens_used=1234)

        with patch(
            'odoo.addons.itsulu_blog_publisher.services.anthropic_provider'
            '.AnthropicProvider.generate',
            return_value=mock_response,
        ):
            router = LLMRouter(self.env, provider='anthropic', model='claude-sonnet-4-20250514')
            result = router.generate(topic='Token test')

        self.assertGreater(result.tokens_used, 0)
        self.assertEqual(result.tokens_used, 1234)