# -*- coding: utf-8 -*-
"""
Tests für Network Retry-Mechanismen.
"""

import asyncio
import pytest
from datetime import datetime

from trixy_core.network.retry import (
    NetworkRetry,
    RetryConfig,
    RetryStrategy,
    RetryStats,
    RetryContext,
    RetryPolicy,
    RetryableError,
    NonRetryableError,
    with_retry,
    AGGRESSIVE_RETRY,
    CONSERVATIVE_RETRY,
    FAST_FAIL_RETRY,
)


class TestRetryConfig:
    """Tests für RetryConfig."""

    def test_default_config(self):
        """Testet Standard-Konfiguration."""
        config = RetryConfig()
        assert config.max_attempts == 3
        assert config.strategy == RetryStrategy.EXPONENTIAL
        assert config.base_delay == 1.0
        assert config.max_delay == 60.0

    def test_custom_config(self):
        """Testet benutzerdefinierte Konfiguration."""
        config = RetryConfig(
            max_attempts=5,
            strategy=RetryStrategy.LINEAR,
            base_delay=2.0,
            jitter=0.2,
        )
        assert config.max_attempts == 5
        assert config.strategy == RetryStrategy.LINEAR
        assert config.base_delay == 2.0
        assert config.jitter == 0.2


class TestRetryContext:
    """Tests für RetryContext."""

    def test_context_creation(self):
        """Testet Context-Erstellung."""
        ctx = RetryContext(attempt=1, max_attempts=5)
        assert ctx.attempt == 1
        assert ctx.max_attempts == 5
        assert ctx.should_retry is True
        assert ctx.remaining_attempts == 4

    def test_is_last_attempt(self):
        """Testet letzter Versuch."""
        ctx = RetryContext(attempt=5, max_attempts=5)
        assert ctx.is_last_attempt is True

        ctx2 = RetryContext(attempt=3, max_attempts=5)
        assert ctx2.is_last_attempt is False

    def test_abort(self):
        """Testet Abbruch."""
        ctx = RetryContext(attempt=1, max_attempts=5)
        ctx.abort()
        assert ctx.should_retry is False

    def test_set_next_delay(self):
        """Testet benutzerdefinierte Verzögerung."""
        ctx = RetryContext(attempt=1, max_attempts=5)
        ctx.set_next_delay(5.0)
        assert ctx.next_delay == 5.0


class TestNetworkRetry:
    """Tests für NetworkRetry."""

    @pytest.fixture
    def retry(self):
        """Erstellt NetworkRetry-Instanz."""
        config = RetryConfig(
            max_attempts=3,
            base_delay=0.01,  # Schnelle Tests
            jitter=0.0,
        )
        return NetworkRetry(config=config)

    @pytest.mark.asyncio
    async def test_successful_operation(self, retry):
        """Testet erfolgreiche Operation."""
        call_count = 0

        async def operation():
            nonlocal call_count
            call_count += 1
            return "success"

        result = await retry.execute(operation)
        assert result == "success"
        assert call_count == 1
        assert retry.stats.successful_attempts == 1

    @pytest.mark.asyncio
    async def test_retry_on_failure(self, retry):
        """Testet Retry bei Fehler."""
        call_count = 0

        async def operation():
            nonlocal call_count
            call_count += 1
            if call_count < 3:
                raise ValueError("Fehler")
            return "success"

        result = await retry.execute(operation)
        assert result == "success"
        assert call_count == 3
        assert retry.stats.total_attempts == 3

    @pytest.mark.asyncio
    async def test_max_attempts_exceeded(self, retry):
        """Testet Überschreitung der maximalen Versuche."""
        async def operation():
            raise ValueError("Dauerhafter Fehler")

        with pytest.raises(ValueError):
            await retry.execute(operation)

        assert retry.stats.total_attempts == 3
        assert retry.stats.failed_attempts == 1

    @pytest.mark.asyncio
    async def test_non_retryable_error(self, retry):
        """Testet NonRetryableError."""
        call_count = 0

        async def operation():
            nonlocal call_count
            call_count += 1
            raise NonRetryableError("Kein Retry")

        with pytest.raises(NonRetryableError):
            await retry.execute(operation)

        assert call_count == 1  # Kein Retry

    @pytest.mark.asyncio
    async def test_retryable_error(self):
        """Testet RetryableError."""
        config = RetryConfig(
            max_attempts=3,
            base_delay=0.01,
            non_retryable_exceptions=(ValueError,),
        )
        retry = NetworkRetry(config=config)

        call_count = 0

        async def operation():
            nonlocal call_count
            call_count += 1
            if call_count < 3:
                raise RetryableError("Retry bitte")
            return "success"

        result = await retry.execute(operation)
        assert result == "success"
        assert call_count == 3

    @pytest.mark.asyncio
    async def test_exponential_backoff(self):
        """Testet exponentielles Backoff."""
        config = RetryConfig(
            max_attempts=4,
            strategy=RetryStrategy.EXPONENTIAL,
            base_delay=0.01,
            multiplier=2.0,
            jitter=0.0,
        )
        retry = NetworkRetry(config=config)

        delays = []

        async def operation():
            if retry.stats.total_attempts < 3:
                raise ValueError("Fehler")
            return "success"

        # Backoff: 0.01, 0.02, 0.04
        await retry.execute(operation)
        assert retry.stats.total_attempts == 3

    @pytest.mark.asyncio
    async def test_linear_backoff(self):
        """Testet lineares Backoff."""
        config = RetryConfig(
            max_attempts=4,
            strategy=RetryStrategy.LINEAR,
            base_delay=0.01,
            jitter=0.0,
        )
        retry = NetworkRetry(config=config)

        async def operation():
            if retry.stats.total_attempts < 3:
                raise ValueError("Fehler")
            return "success"

        # Linear: 0.01, 0.02, 0.03
        await retry.execute(operation)
        assert retry.stats.total_attempts == 3

    @pytest.mark.asyncio
    async def test_constant_backoff(self):
        """Testet konstantes Backoff."""
        config = RetryConfig(
            max_attempts=3,
            strategy=RetryStrategy.CONSTANT,
            base_delay=0.01,
            jitter=0.0,
        )
        retry = NetworkRetry(config=config)

        async def operation():
            if retry.stats.total_attempts < 2:
                raise ValueError("Fehler")
            return "success"

        await retry.execute(operation)
        assert retry.stats.total_attempts == 2

    @pytest.mark.asyncio
    async def test_max_delay_limit(self):
        """Testet maximale Verzögerung."""
        config = RetryConfig(
            max_attempts=5,
            strategy=RetryStrategy.EXPONENTIAL,
            base_delay=1.0,
            max_delay=0.05,
            multiplier=10.0,
            jitter=0.0,
        )
        retry = NetworkRetry(config=config)

        # Verzögerung sollte auf max_delay begrenzt sein
        ctx = RetryContext(attempt=3, max_attempts=5)
        delay = retry._calculate_delay(3, ctx)
        assert delay <= config.max_delay

    def test_reset_stats(self, retry):
        """Testet Stats-Reset."""
        retry.stats.total_attempts = 10
        retry.stats.successful_attempts = 5
        retry.reset_stats()
        assert retry.stats.total_attempts == 0
        assert retry.stats.successful_attempts == 0


class TestWithRetryDecorator:
    """Tests für @with_retry Decorator."""

    @pytest.mark.asyncio
    async def test_decorator_success(self):
        """Testet erfolgreichen Decorator."""
        call_count = 0

        @with_retry(max_attempts=3, base_delay=0.01)
        async def operation():
            nonlocal call_count
            call_count += 1
            return "success"

        result = await operation()
        assert result == "success"
        assert call_count == 1

    @pytest.mark.asyncio
    async def test_decorator_retry(self):
        """Testet Decorator mit Retry."""
        call_count = 0

        @with_retry(max_attempts=3, base_delay=0.01)
        async def operation():
            nonlocal call_count
            call_count += 1
            if call_count < 3:
                raise ValueError("Fehler")
            return "success"

        result = await operation()
        assert result == "success"
        assert call_count == 3

    @pytest.mark.asyncio
    async def test_decorator_failure(self):
        """Testet Decorator mit Fehlschlag."""
        @with_retry(max_attempts=2, base_delay=0.01)
        async def operation():
            raise ValueError("Dauerhafter Fehler")

        with pytest.raises(ValueError):
            await operation()


class TestRetryPolicy:
    """Tests für RetryPolicy."""

    @pytest.fixture
    def policy(self):
        """Erstellt RetryPolicy."""
        config = RetryConfig(
            max_attempts=3,
            base_delay=0.01,
        )
        return RetryPolicy("test_policy", config)

    @pytest.mark.asyncio
    async def test_policy_execute(self, policy):
        """Testet Policy-Ausführung."""
        async def operation():
            return "success"

        result = await policy.execute(operation, "test_op")
        assert result == "success"

    @pytest.mark.asyncio
    async def test_policy_stats(self, policy):
        """Testet Policy-Statistiken."""
        async def operation():
            return "success"

        await policy.execute(operation, "op1")
        await policy.execute(operation, "op2")

        stats = policy.get_stats()
        assert "op1" in stats
        assert "op2" in stats

    @pytest.mark.asyncio
    async def test_policy_single_stats(self, policy):
        """Testet einzelne Policy-Statistik."""
        async def operation():
            return "success"

        await policy.execute(operation, "test_op")

        stats = policy.get_stats("test_op")
        assert stats.successful_attempts == 1


class TestPredefinedPolicies:
    """Tests für vordefinierte Policies."""

    def test_aggressive_retry(self):
        """Testet aggressive Retry-Config."""
        assert AGGRESSIVE_RETRY.max_attempts == 10
        assert AGGRESSIVE_RETRY.strategy == RetryStrategy.EXPONENTIAL

    def test_conservative_retry(self):
        """Testet konservative Retry-Config."""
        assert CONSERVATIVE_RETRY.max_attempts == 3
        assert CONSERVATIVE_RETRY.strategy == RetryStrategy.LINEAR

    def test_fast_fail_retry(self):
        """Testet Fast-Fail Retry-Config."""
        assert FAST_FAIL_RETRY.max_attempts == 2
        assert FAST_FAIL_RETRY.strategy == RetryStrategy.CONSTANT