"""Fault injection tests for Model Gateway transient errors, 429 backoff, 5xx, and failovers."""

from __future__ import annotations

import asyncio
from typing import Any, Dict, List

import httpx

from src.runtime.core.config import (
    ModelRoleConfig,
    RuntimeConfig,
    RuntimeLimits,
    RuntimeObservabilityConfig,
    RuntimePricing,
    RuntimeStoragePaths,
)
from src.runtime.gateway.adapters import ProviderAdapter
from src.runtime.gateway.client import ModelGatewayClient


class FaultyMockAdapter(ProviderAdapter):
    def __init__(self, responses: List[Any]):
        super().__init__("faulty_provider")
        self.responses = list(responses)
        self.call_count = 0

    async def execute_call(
        self,
        model: str,
        messages: List[Dict[str, str]],
        temperature: float = 0.0,
        timeout_seconds: int = 30,
        response_format: Any = None,
    ) -> Dict[str, Any]:
        self.call_count += 1
        if not self.responses:
            raise IOError("No more fault injection responses configured")
        curr = self.responses.pop(0)
        if isinstance(curr, Exception):
            raise curr
        return curr


def create_fault_test_config() -> RuntimeConfig:
    return RuntimeConfig(
        config_version="1.0.0",
        paths=RuntimeStoragePaths(),
        roles={
            "runtime_primary": ModelRoleConfig(
                role_config_version="1.0.0",
                provider="groq",
                model="llama-3.1-8b-instant",
                endpoint_url="https://api.groq.com/openai/v1",
                timeout_seconds=2.0,
                max_retries=3,
                parameters={"temperature": 0.0},
            ),
            "runtime_fallback": ModelRoleConfig(
                role_config_version="1.0.0",
                provider="deepseek",
                model="deepseek-chat",
                endpoint_url="https://api.deepseek.com/v1",
                timeout_seconds=2.0,
                max_retries=3,
                parameters={"temperature": 0.0},
            ),
        },
        prompts={},
        ecp={},
        limits=RuntimeLimits(),
        pricing=RuntimePricing(),
        langfuse=RuntimeObservabilityConfig(),
        sqlite_busy_timeout_ms=2000,
        raw_config_bytes_sha256="abc",
    )


def test_gateway_fault_http_429_rate_limit_and_fallback():
    async def _test():
        config = create_fault_test_config()
        client = ModelGatewayClient(config)

        # Primary repeatedly throws 429
        req = httpx.Request("POST", "https://api.groq.com/openai/v1/chat/completions")
        resp_429 = httpx.Response(429, request=req)
        primary_mock = FaultyMockAdapter(
            [
                httpx.HTTPStatusError("Rate limit exceeded", request=req, response=resp_429),
                httpx.HTTPStatusError("Rate limit exceeded", request=req, response=resp_429),
                httpx.HTTPStatusError("Rate limit exceeded", request=req, response=resp_429),
            ]
        )

        # Fallback recovers successfully
        fallback_mock = FaultyMockAdapter(
            [
                {
                    "choices": [{"message": {"content": '{"status": "recovered_by_fallback"}'}}],
                    "usage": {"prompt_tokens": 50, "completion_tokens": 10},
                }
            ]
        )

        client.register_adapter("groq", primary_mock)
        client.register_adapter("deepseek", fallback_mock)

        resp = await client.execute_structured_call(
            messages=[{"role": "user", "content": "test"}],
            schema_dict={"type": "object"},
        )
        assert resp.status == "success"
        assert resp.effective_role == "runtime_fallback"
        assert resp.used_fallback is True
        assert resp.content_json == {"status": "recovered_by_fallback"}
        assert primary_mock.call_count == 3
        assert fallback_mock.call_count == 1

    asyncio.run(_test())


def test_gateway_fault_http_500_server_error_and_fallback():
    async def _test():
        config = create_fault_test_config()
        client = ModelGatewayClient(config)

        req = httpx.Request("POST", "https://api.groq.com/openai/v1/chat/completions")
        resp_500 = httpx.Response(500, request=req)
        primary_mock = FaultyMockAdapter(
            [
                httpx.HTTPStatusError("Internal Server Error", request=req, response=resp_500),
                httpx.HTTPStatusError("Internal Server Error", request=req, response=resp_500),
                httpx.HTTPStatusError("Internal Server Error", request=req, response=resp_500),
            ]
        )

        fallback_mock = FaultyMockAdapter(
            [
                {
                    "choices": [{"message": {"content": '{"status": "recovered_from_500"}'}}],
                    "usage": {"prompt_tokens": 60, "completion_tokens": 15},
                }
            ]
        )

        client.register_adapter("groq", primary_mock)
        client.register_adapter("deepseek", fallback_mock)

        resp = await client.execute_structured_call(
            messages=[{"role": "user", "content": "test"}],
            schema_dict={"type": "object"},
        )
        assert resp.status == "success"
        assert resp.effective_role == "runtime_fallback"
        assert resp.used_fallback is True
        assert resp.content_json == {"status": "recovered_from_500"}

    asyncio.run(_test())