"""
Shared fixtures and helpers for proxy tests.

This module provides reusable utilities for creating proxy test clients
with database and Redis cache configuration.
"""
import asyncio
import os
import tempfile
from typing import Dict, Optional

import pytest
import yaml
from fastapi.testclient import TestClient


def build_cache_config(enable_cache: bool = True) -> Optional[Dict]:
    """
    Build Redis cache configuration from environment variables.
    
    Args:
        enable_cache: Whether to enable cache (default: True)
    
    Returns:
        dict: Cache configuration dict with 'cache' and 'cache_params' keys, or None
    """
    if not enable_cache:
        return None
    
    redis_host = os.getenv("REDIS_HOST")
    if not redis_host:
        return None
    
    redis_port = os.getenv("REDIS_PORT", "6379")
    cache_params = {
        "type": "redis",
        "host": redis_host,
        "port": int(redis_port) if redis_port.isdigit() else redis_port,
    }
    
    redis_password = os.getenv("REDIS_PASSWORD")
    if redis_password:
        cache_params["password"] = redis_password
    
    return {
        "cache": True,
        "cache_params": cache_params
    }


def build_minimal_proxy_config(database_url: Optional[str] = None, **init_options) -> Dict:
    """
    Build a minimal proxy configuration YAML.
    
    Args:
        database_url: Optional database URL (falls back to DATABASE_URL env var)
        **init_options: Additional configuration options:
            - master_key: API key for authentication (default: "sk-1234")
            - enable_cache: Whether to enable Redis cache (default: True)
            - success_callback: Callback function for success events
    
    Returns:
        dict: Configuration dictionary ready to be written as YAML
    """
    config = {
        "general_settings": {
            "master_key": init_options.get("master_key", "sk-1234")
        },
        "litellm_settings": {}
    }
    
    # Configure database
    db_url = database_url or os.getenv("DATABASE_URL")
    if db_url:
        config["general_settings"]["database_url"] = db_url
    
    # Configure cache if Redis is available
    enable_cache = init_options.get("enable_cache", True)
    cache_config = build_cache_config(enable_cache=enable_cache)
    if cache_config:
        config["litellm_settings"].update(cache_config)
    
    # Add success_callback if provided (for realistic readiness endpoint)
    if init_options.get("success_callback") is not None:
        config["litellm_settings"]["success_callback"] = init_options["success_callback"]
    
    # Add any other litellm_settings from init_options
    excluded_keys = {"master_key", "debug", "success_callback", "database_url", "enable_cache"}
    for key, value in init_options.items():
        if key not in excluded_keys and key not in config["litellm_settings"]:
            config["litellm_settings"][key] = value
    
    return config


def set_proxy_environment_variables(monkeypatch, database_url: Optional[str] = None) -> None:
    """
    Set environment variables for database and Redis.
    
    Args:
        monkeypatch: pytest monkeypatch fixture
        database_url: Optional database URL (falls back to DATABASE_URL env var)
    """
    # Set database URL
    db_url = database_url or os.getenv("DATABASE_URL")
    if db_url:
        monkeypatch.setenv("DATABASE_URL", db_url)
    
    # Set Redis environment variables if available
    redis_host = os.getenv("REDIS_HOST")
    if redis_host:
        monkeypatch.setenv("REDIS_HOST", redis_host)
        monkeypatch.setenv("REDIS_PORT", os.getenv("REDIS_PORT", "6379"))
        redis_password = os.getenv("REDIS_PASSWORD")
        if redis_password:
            monkeypatch.setenv("REDIS_PASSWORD", redis_password)


def create_proxy_test_client(monkeypatch, database_url: Optional[str] = None, **init_options) -> TestClient:
    """
    Create a proxy TestClient with optional database and Redis cache configuration.
    
    Args:
        monkeypatch: pytest monkeypatch fixture
        database_url: Optional database URL (falls back to DATABASE_URL env var)
        **init_options: Additional configuration options:
            - master_key: API key for authentication (default: "sk-1234")
            - enable_cache: Whether to enable Redis cache (default: True)
            - success_callback: Callback function for success events
            - debug: Enable debug mode
    
    Returns:
        TestClient: FastAPI test client for the proxy server
    """
    from litellm.proxy.proxy_server import cleanup_router_config_variables, initialize, app

    cleanup_router_config_variables()
    
    # Get config file path
    filepath = os.path.dirname(os.path.abspath(__file__))
    default_config_fp = os.path.join(filepath, "test_configs", "test_config_no_auth.yaml")
    
    # Check if we need to create a minimal config with Redis/database
    enable_cache = init_options.get("enable_cache", True)
    needs_redis = enable_cache and os.getenv("REDIS_HOST") is not None
    needs_db = (database_url or os.getenv("DATABASE_URL")) is not None
    
    # Create minimal config if:
    # 1. Default config file doesn't exist, OR
    # 2. We need Redis/database config that might not be in the default config
    if not os.path.exists(default_config_fp) or needs_redis or needs_db:
        minimal_config = build_minimal_proxy_config(database_url=database_url, **init_options)
        
        with tempfile.NamedTemporaryFile(mode='w', suffix='.yaml', delete=False) as f:
            yaml.dump(minimal_config, f)
            config_fp = f.name
    else:
        config_fp = default_config_fp
    
    # Set environment variables
    set_proxy_environment_variables(monkeypatch, database_url=database_url)
    
    # Initialize proxy
    asyncio.run(initialize(config=config_fp, debug=init_options.get("debug", False)))
    return TestClient(app)