using Svrnty.MCP.Gateway.Core.Models;
using Svrnty.MCP.Gateway.Infrastructure.Routing;
using Svrnty.MCP.Gateway.Infrastructure.Connection;
using Svrnty.MCP.Gateway.Infrastructure.Security;
using Svrnty.MCP.Gateway.Core.Interfaces;

namespace CodexMcpGateway;

/// <summary>
/// Sample MCP Gateway application demonstrating gateway capabilities.
/// Routes requests to multiple MCP servers with load balancing and health monitoring.
/// </summary>
class Program
{
    static async Task Main(string[] args)
    {
        Console.WriteLine("=== CODEX MCP Gateway Sample ===");
        Console.WriteLine("Gateway routes requests to MCP servers via HTTP transport\n");

        // Step 1: Create connection pool
        var connectionPool = new ServerConnectionPool
        {
            MaxConnectionsPerServer = 10,
            IdleTimeout = TimeSpan.FromMinutes(5)
        };

        // Step 2: Choose routing strategy
        Console.WriteLine("Select routing strategy:");
        Console.WriteLine("1. Round Robin (default)");
        Console.WriteLine("2. Tool-based routing");
        Console.WriteLine("3. Client-based routing");
        Console.Write("\nChoice (1-3): ");

        var choice = Console.ReadLine();
        IRoutingStrategy strategy = choice switch
        {
            "2" => new ToolBasedStrategy(new Dictionary<string, string>
            {
                ["search_*"] = "codex-server-1",
                ["get_document"] = "codex-server-2",
                ["*"] = "codex-server-1"
            }),
            "3" => new ClientBasedStrategy(new Dictionary<string, string>
            {
                ["client-a"] = "codex-server-1",
                ["client-b"] = "codex-server-2"
            }),
            _ => new RoundRobinStrategy()
        };

        Console.WriteLine($"Using {strategy.GetType().Name}\n");

        // Step 3: Create gateway router
        var router = new GatewayRouter(strategy, connectionPool);

        // Step 4: Register MCP servers
        Console.WriteLine("Registering MCP servers...");

        var server1 = new ServerConfig
        {
            Id = "codex-server-1",
            Name = "CODEX MCP Server 1",
            TransportType = "Http",
            BaseUrl = "http://localhost:5050",
            Enabled = true
        };

        await router.RegisterServerAsync(server1);
        Console.WriteLine($"  ✓ Registered: {server1.Name} ({server1.BaseUrl})");

        // Step 5: Check server health
        Console.WriteLine("\nChecking server health...");
        var health = await router.GetServerHealthAsync();
        foreach (var serverHealth in health)
        {
            var status = serverHealth.IsHealthy ? "✓ Healthy" : "✗ Unhealthy";
            Console.WriteLine($"  {status}: {serverHealth.ServerName}");
        }

        // Step 6: Demonstrate request routing
        Console.WriteLine("\n--- Simulating Gateway Requests ---\n");

        Console.WriteLine("Request 1: search_codex");
        var request1 = new GatewayRequest
        {
            ToolName = "search_codex",
            Arguments = new Dictionary<string, object>
            {
                ["query"] = "Model Context Protocol",
                ["maxResults"] = 5
            },
            ClientId = "demo-client"
        };

        try
        {
            var response1 = await router.RouteAsync(request1);
            Console.WriteLine($"  Response: {(response1.Success ? "Success" : "Failed")}");
            Console.WriteLine($"  Routed to: {response1.ServerId}");
            if (!response1.Success)
            {
                Console.WriteLine($"  Error: {response1.Error}");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"  Error: {ex.Message}");
        }

        // Step 7: Demonstrate authentication
        Console.WriteLine("\n--- Testing Authentication ---\n");

        var apiKeyProvider = new ApiKeyAuthProvider(new Dictionary<string, string>
        {
            ["demo-client"] = "secret-key-123"
        });

        var authContext = new AuthenticationContext
        {
            ClientId = "demo-client",
            Credentials = "secret-key-123"
        };

        var authResult = await apiKeyProvider.AuthenticateAsync(authContext);
        Console.WriteLine($"Authentication: {(authResult.IsAuthenticated ? "✓ Success" : "✗ Failed")}");

        // Step 8: Show statistics
        Console.WriteLine("\n--- Gateway Statistics ---\n");
        var poolStats = connectionPool.GetPoolStats();
        Console.WriteLine($"Connection Pool:");
        Console.WriteLine($"  Total connections: {poolStats.TotalConnections}");
        Console.WriteLine($"  Active connections: {poolStats.ActiveConnections}");
        Console.WriteLine($"  Idle connections: {poolStats.IdleConnections}");

        Console.WriteLine("\n=== Sample Complete ===");
    }
}