import asyncio
import time
from unittest.mock import AsyncMock, patch

import pytest
from openai import APIError, RateLimitError

from src.adapters import (
    CircuitBreaker,
    CircuitBreakerError,
    LLMProviderAdapter,
    LLMRateLimitError,
    LLMTokenLimitError,
    RateLimiter,
    RuWikiAdapter,
)


class TestCircuitBreaker:

    @pytest.mark.asyncio
    async def test_successful_call(self):
        cb = CircuitBreaker(failure_threshold=3, recovery_timeout=1)

        async def test_func():
            return "success"

        result = await cb.call(test_func)
        assert result == "success"

    @pytest.mark.asyncio
    async def test_failure_accumulation(self):
        cb = CircuitBreaker(failure_threshold=2, recovery_timeout=1)

        async def failing_func():
            raise ValueError("Test error")

        with pytest.raises(ValueError):
            await cb.call(failing_func)

        with pytest.raises(ValueError):
            await cb.call(failing_func)

        with pytest.raises(CircuitBreakerError):
            await cb.call(failing_func)

    @pytest.mark.asyncio
    async def test_recovery(self):
        cb = CircuitBreaker(failure_threshold=1, recovery_timeout=0.1)

        async def failing_func():
            raise ValueError("Test error")

        async def success_func():
            return "recovered"

        with pytest.raises(ValueError):
            await cb.call(failing_func)

        with pytest.raises(CircuitBreakerError):
            await cb.call(failing_func)

        await asyncio.sleep(0.2)

        result = await cb.call(success_func)
        assert result == "recovered"


class TestRateLimiter:

    @pytest.mark.asyncio
    async def test_concurrency_limit(self):
        limiter = RateLimiter(max_concurrent=2)
        results = []

        async def test_task(task_id: int):
            async with limiter:
                results.append(f"start_{task_id}")
                await asyncio.sleep(0.1)
                results.append(f"end_{task_id}")

        tasks = [test_task(i) for i in range(3)]
        await asyncio.gather(*tasks)

        start_count = 0
        max_concurrent = 0

        for result in results:
            if result.startswith("start_"):
                start_count += 1
                max_concurrent = max(max_concurrent, start_count)
            elif result.startswith("end_"):
                start_count -= 1

        assert max_concurrent <= 2


class TestRuWikiAdapter:

    def test_extract_title_from_url(self):
        adapter = RuWikiAdapter

        title = adapter.extract_title_from_url("https://ru.wikipedia.org/wiki/Тест")
        assert title == "Тест"

        title = adapter.extract_title_from_url("https://ru.wikipedia.org/wiki/Тест_статья")
        assert title == "Тест статья"

        title = adapter.extract_title_from_url(
            "https://ru.wikipedia.org/wiki/%D0%A2%D0%B5%D1%81%D1%82"
        )
        assert title == "Тест"

    def test_extract_title_invalid_url(self):
        adapter = RuWikiAdapter

        with pytest.raises(ValueError):
            adapter.extract_title_from_url("https://example.com/invalid")

        with pytest.raises(ValueError):
            adapter.extract_title_from_url("https://ru.wikipedia.org/invalid")

    def test_clean_wikitext(self, test_config, sample_wikitext):
        """Тест очистки wiki-текста."""
        adapter = RuWikiAdapter(test_config)

        cleaned = adapter._clean_wikitext(sample_wikitext)

        assert "{{навигация" not in cleaned
        assert "[[Категория:" not in cleaned

        assert "'''Тест'''" in cleaned
        assert "== Определение ==" in cleaned

    @pytest.mark.asyncio
    async def test_health_check_success(self, test_config):
        adapter = RuWikiAdapter(test_config)

        with patch.object(adapter, "_get_client") as mock_get_client:
            mock_client = AsyncMock()
            mock_get_client.return_value = mock_client

            with patch("asyncio.to_thread") as mock_to_thread:
                mock_to_thread.return_value = {"query": {"general": {}}}

                result = await adapter.health_check()
                assert result is True

    @pytest.mark.asyncio
    async def test_health_check_failure(self, test_config):
        adapter = RuWikiAdapter(test_config)

        with patch.object(adapter, "_get_client") as mock_get_client:
            mock_get_client.side_effect = ConnectionError("Network error")

            result = await adapter.health_check()
            assert result is False


class TestLLMProviderAdapter:

    def test_count_tokens(self, test_config):
        """Тест подсчёта токенов."""
        adapter = LLMProviderAdapter(test_config)

        count = adapter.count_tokens("Hello world")
        assert count > 0

        count = adapter.count_tokens("")
        assert count == 0

    @pytest.mark.asyncio
    async def test_rpm_limiting(self, test_config):
        test_config.openai_rpm = 2
        adapter = LLMProviderAdapter(test_config)

        current_time = time.time()
        adapter.request_times = [current_time - 10, current_time - 5]

        start_time = time.time()
        await adapter._check_rpm_limit()
        elapsed = time.time() - start_time

        assert elapsed > 0.01

    @pytest.mark.asyncio
    async def test_simplify_text_token_limit_error(self, test_config):
        adapter = LLMProviderAdapter(test_config)

        long_text = "word " * 2000

        with pytest.raises(LLMTokenLimitError):
            await adapter.simplify_text("Test", long_text, "template")

    @pytest.mark.asyncio
    async def test_simplify_text_success(self, test_config, mock_openai_response):
        adapter = LLMProviderAdapter(test_config)

        with patch.object(adapter.client.chat.completions, "create") as mock_create:
            mock_create.return_value = mock_openai_response

            with patch.object(adapter, "_check_rpm_limit"):
                result = await adapter.simplify_text(
                    title="Тест",
                    wiki_text="Тестовый текст",
                    prompt_template="### role: user\n{wiki_source_text}",
                )

                simplified_text, input_tokens, output_tokens = result

                assert "Упрощённый текст для школьников" in simplified_text
                assert "###END###" not in simplified_text
                assert input_tokens > 0
                assert output_tokens > 0

    @pytest.mark.asyncio
    async def test_simplify_text_openai_error(self, test_config):
        adapter = LLMProviderAdapter(test_config)

        with patch.object(adapter.client.chat.completions, "create") as mock_create:
            mock_create.side_effect = RateLimitError(
                "Rate limit exceeded", response=None, body=None
            )

            with patch.object(adapter, "_check_rpm_limit"):
                with pytest.raises(LLMRateLimitError):
                    await adapter.simplify_text(
                        title="Тест",
                        wiki_text="Тестовый текст",
                        prompt_template="### role: user\n{wiki_source_text}",
                    )

    def test_parse_prompt_template(self, test_config):
        adapter = LLMProviderAdapter(test_config)

        template = """### role: system
Ты помощник.

### role: user
Задание: {task}"""

        messages = adapter._parse_prompt_template(template)

        assert len(messages) == 2
        assert messages[0]["role"] == "system"
        assert messages[0]["content"] == "Ты помощник."
        assert messages[1]["role"] == "user"
        assert messages[1]["content"] == "Задание: {task}"

    def test_parse_prompt_template_fallback(self, test_config):
        adapter = LLMProviderAdapter(test_config)

        template = "Обычный текст без ролей"
        messages = adapter._parse_prompt_template(template)

        assert len(messages) == 1
        assert messages[0]["role"] == "user"
        assert messages[0]["content"] == template

    @pytest.mark.asyncio
    async def test_health_check_success(self, test_config, mock_openai_response):
        adapter = LLMProviderAdapter(test_config)

        with patch.object(adapter.client.chat.completions, "create") as mock_create:
            mock_create.return_value = mock_openai_response

            result = await adapter.health_check()
            assert result is True

    @pytest.mark.asyncio
    async def test_health_check_failure(self, test_config):
        adapter = LLMProviderAdapter(test_config)

        with patch.object(adapter.client.chat.completions, "create") as mock_create:
            mock_create.side_effect = APIError("API Error", response=None, body=None)

            result = await adapter.health_check()
            assert result is False