"""
Configuration file for ATS load testing scenarios.

This file defines different test scenarios with varying load patterns
to simulate real-world usage of the ATS application.
"""

import os
from dataclasses import dataclass
from typing import Dict, List, Optional

@dataclass
class TestScenario:
    """Defines a load test scenario."""
    name: str
    description: str
    users: int
    spawn_rate: int
    run_time: str
    host: str
    user_classes: List[str]
    tags: List[str]
    login_credentials: Optional[Dict] = None

class LoadTestConfig:
    """Configuration management for load testing scenarios."""

    def __init__(self):
        self.base_host = os.getenv("ATS_HOST", "http://localhost:8000")
        self.scenarios = self._define_scenarios()

    def _define_scenarios(self) -> Dict[str, TestScenario]:
        """Define all available test scenarios."""
        return {
            "smoke_test": TestScenario(
                name="Smoke Test",
                description="Quick sanity check with minimal load",
                users=5,
                spawn_rate=2,
                run_time="2m",
                host=self.base_host,
                user_classes=["PublicUser"],
                tags=["smoke", "quick"]
            ),

            "light_load": TestScenario(
                name="Light Load Test",
                description="Simulates normal daytime traffic",
                users=20,
                spawn_rate=5,
                run_time="5m",
                host=self.base_host,
                user_classes=["PublicUser", "AuthenticatedUser"],
                tags=["light", "normal"]
            ),

            "moderate_load": TestScenario(
                name="Moderate Load Test",
                description="Simulates peak traffic periods",
                users=50,
                spawn_rate=10,
                run_time="10m",
                host=self.base_host,
                user_classes=["PublicUser", "AuthenticatedUser", "APIUser"],
                tags=["moderate", "peak"]
            ),

            "heavy_load": TestScenario(
                name="Heavy Load Test",
                description="Stress test with high concurrent users",
                users=100,
                spawn_rate=20,
                run_time="15m",
                host=self.base_host,
                user_classes=["PublicUser", "AuthenticatedUser", "APIUser", "FileUploadUser"],
                tags=["heavy", "stress"]
            ),

            "api_focus": TestScenario(
                name="API Focus Test",
                description="Focus on API endpoint performance",
                users=30,
                spawn_rate=5,
                run_time="10m",
                host=self.base_host,
                user_classes=["APIUser"],
                tags=["api", "backend"]
            ),

            "file_upload_test": TestScenario(
                name="File Upload Test",
                description="Test file upload performance",
                users=15,
                spawn_rate=3,
                run_time="8m",
                host=self.base_host,
                user_classes=["FileUploadUser", "AuthenticatedUser"],
                tags=["upload", "files"]
            ),

            "authenticated_test": TestScenario(
                name="Authenticated User Test",
                description="Test authenticated user workflows",
                users=25,
                spawn_rate=5,
                run_time="8m",
                host=self.base_host,
                user_classes=["AuthenticatedUser"],
                tags=["authenticated", "users"],
                login_credentials={
                    "username": os.getenv("TEST_USERNAME", "testuser"),
                    "password": os.getenv("TEST_PASSWORD", "testpass123")
                }
            ),

            "endurance_test": TestScenario(
                name="Endurance Test",
                description="Long-running stability test",
                users=30,
                spawn_rate=5,
                run_time="1h",
                host=self.base_host,
                user_classes=["PublicUser", "AuthenticatedUser", "APIUser"],
                tags=["endurance", "stability"]
            )
        }

    def get_scenario(self, scenario_name: str) -> Optional[TestScenario]:
        """Get a specific test scenario by name."""
        return self.scenarios.get(scenario_name)

    def list_scenarios(self) -> List[str]:
        """List all available scenario names."""
        return list(self.scenarios.keys())

    def get_scenarios_by_tag(self, tag: str) -> List[TestScenario]:
        """Get all scenarios with a specific tag."""
        return [scenario for scenario in self.scenarios.values() if tag in scenario.tags]

# Performance thresholds for alerting
PERFORMANCE_THRESHOLDS = {
    "response_time_p95": 2000,  # 95th percentile should be under 2 seconds
    "response_time_avg": 1000,  # Average response time under 1 second
    "error_rate": 0.05,         # Error rate under 5%
    "rps_minimum": 10,          # Minimum requests per second
}

# Environment-specific configurations
ENVIRONMENTS = {
    "development": {
        "host": "http://localhost:8000",
        "database": "postgresql://localhost:5432/kaauh_ats_dev",
        "redis": "redis://localhost:6379/0"
    },
    "staging": {
        "host": "https://staging.kaauh.edu.sa",
        "database": os.getenv("STAGING_DB_URL"),
        "redis": os.getenv("STAGING_REDIS_URL")
    },
    "production": {
        "host": "https://kaauh.edu.sa",
        "database": os.getenv("PROD_DB_URL"),
        "redis": os.getenv("PROD_REDIS_URL")
    }
}

# Test data generation settings
TEST_DATA_CONFIG = {
    "job_count": 100,
    "user_count": 50,
    "application_count": 500,
    "file_size_mb": 2,
    "concurrent_uploads": 5
}