using ViewEngine.Client;
using ViewEngine.Client.Models;

namespace ViewEngine.Console;

/// <summary>
/// Demo console application showing how to use the ViewEngine.Client library
/// </summary>
class Program
{
    static async Task Main(string[] args)
    {
        System.Console.WriteLine("╔══════════════════════════════════════════════════════════╗");
        System.Console.WriteLine("║          ViewEngine Client Library Demo                  ║");
        System.Console.WriteLine("║  Demonstrates using ViewEngine.Client NuGet package      ║");
        System.Console.WriteLine("╚══════════════════════════════════════════════════════════╝");
        System.Console.WriteLine();

        // Get API key from command line or prompt
        string? apiKey;
        if (args.Length > 0)
        {
            apiKey = args[0];
        }
        else
        {
            System.Console.Write("Enter your API key: ");
            apiKey = System.Console.ReadLine();
        }

        if (string.IsNullOrWhiteSpace(apiKey))
        {
            System.Console.WriteLine("❌ Error: API key is required");
            System.Console.WriteLine();
            System.Console.WriteLine("Usage:");
            System.Console.WriteLine("  dotnet run <api-key>");
            System.Console.WriteLine("  OR");
            System.Console.WriteLine("  dotnet run   (you'll be prompted for the API key)");
            return;
        }

        try
        {
            await RunDemoAsync(apiKey);
        }
        catch (Exception ex)
        {
            System.Console.WriteLine($"❌ Error: {ex.Message}");
            System.Console.WriteLine();
            System.Console.WriteLine("Stack trace:");
            System.Console.WriteLine(ex.StackTrace);
        }

        System.Console.WriteLine();
        System.Console.WriteLine("Press any key to exit...");
        System.Console.ReadKey();
    }

    static async Task RunDemoAsync(string apiKey)
    {
        // Create the ViewEngine client
        using var client = new ViewEngineClient(apiKey);

        System.Console.WriteLine("🔍 Step 1: Discovering available MCP tools...");
        System.Console.WriteLine();

        try
        {
            var tools = await client.ListToolsAsync();
            System.Console.WriteLine($"✅ Tools response received");
            System.Console.WriteLine($"   {tools}");
        }
        catch (Exception ex)
        {
            System.Console.WriteLine($"⚠️  Could not list tools: {ex.Message}");
        }

        System.Console.WriteLine();
        System.Console.WriteLine("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
        System.Console.WriteLine();

        // Get URL to retrieve
        System.Console.Write("Enter a URL to retrieve (or press Enter for example.com): ");
        var url = System.Console.ReadLine();
        if (string.IsNullOrWhiteSpace(url))
        {
            url = "https://example.com";
        }

        System.Console.WriteLine();
        System.Console.Write("Force fresh retrieval? (y/n, default: n - use cache if available): ");
        var forceRefreshInput = System.Console.ReadLine()?.ToLower();
        var forceRefresh = forceRefreshInput == "y";

        System.Console.WriteLine();
        System.Console.Write("Generate AI summary? (y/n, default: n): ");
        var summaryInput = System.Console.ReadLine()?.ToLower();
        var generateSummary = summaryInput == "y";

        System.Console.WriteLine();
        System.Console.WriteLine($"🌐 Step 2: Submitting retrieval request for {url}...");
        if (forceRefresh)
        {
            System.Console.WriteLine("   (Forcing fresh retrieval, bypassing cache)");
        }
        if (generateSummary)
        {
            System.Console.WriteLine("   (AI summary will be generated)");
        }
        System.Console.WriteLine();

        // Submit the retrieval request
        var request = new SubmitRetrievalRequest
        {
            Url = url,
            ForceRefresh = forceRefresh,
            GenerateSummary = generateSummary,
            TimeoutSeconds = 60,
            Priority = 5
        };

        var submitResponse = await client.SubmitRetrievalAsync(request);

        System.Console.WriteLine($"✅ Request submitted successfully!");
        System.Console.WriteLine($"   Request ID: {submitResponse.RequestId}");
        System.Console.WriteLine($"   Status: {submitResponse.Status}");
        System.Console.WriteLine($"   Estimated wait: {submitResponse.EstimatedWaitTimeSeconds}s");

        System.Console.WriteLine();
        System.Console.WriteLine("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
        System.Console.WriteLine();
        System.Console.WriteLine("⏳ Step 3: Polling for results...");
        System.Console.WriteLine();

        // Poll for completion
        RetrievalStatusResponse status;
        int attempt = 0;
        const int maxAttempts = 60;

        do
        {
            attempt++;
            await Task.Delay(2000);

            status = await client.GetRetrievalStatusAsync(submitResponse.RequestId);
            System.Console.WriteLine($"   [{attempt}/{maxAttempts}] Status: {status.Status} - {status.Message}");

            if (status.Status == "failed" || status.Status == "canceled")
            {
                System.Console.WriteLine($"   Error: {status.Error}");
                return;
            }

        } while (status.Status != "complete" && attempt < maxAttempts);

        if (status.Status != "complete")
        {
            System.Console.WriteLine("⚠️  Timeout: Maximum polling attempts reached");
            return;
        }

        System.Console.WriteLine();
        System.Console.WriteLine($"✅ Retrieval completed!");
        System.Console.WriteLine($"   URL: {status.Url}");
        System.Console.WriteLine($"   Completed at: {status.CompletedAt}");

        // Download the page content
        System.Console.WriteLine();
        System.Console.WriteLine("⬇️  Step 4: Downloading page content...");

        var pageData = await client.GetPageContentAsync(submitResponse.RequestId);

        System.Console.WriteLine();
        System.Console.WriteLine("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
        System.Console.WriteLine("📄 Page Content:");
        System.Console.WriteLine("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
        System.Console.WriteLine($"   Title: {pageData.Title}");
        System.Console.WriteLine($"   URL: {pageData.Url}");
        System.Console.WriteLine($"   Meta Description: {pageData.MetaDescription ?? "(none)"}");
        System.Console.WriteLine($"   Favicon: {pageData.FaviconUrl ?? "(none)"}");
        System.Console.WriteLine($"   Routes: {pageData.Routes?.Count ?? 0} links");
        System.Console.WriteLine($"   Body Routes: {pageData.BodyRoutes?.Count ?? 0} links");

        // Display HTTP status code (new feature!)
        if (pageData.HttpStatusCode.HasValue)
        {
            System.Console.WriteLine($"   HTTP Status: {pageData.HttpStatusCode}");
            if (!pageData.IsSuccess)
            {
                System.Console.WriteLine($"   ⚠️  Warning: Page returned error status");
                System.Console.WriteLine($"      IsClientError (4xx): {pageData.IsClientError}");
                System.Console.WriteLine($"      IsServerError (5xx): {pageData.IsServerError}");
            }
        }

        if (!string.IsNullOrEmpty(pageData.Summary))
        {
            System.Console.WriteLine();
            System.Console.WriteLine("🤖 AI Summary:");
            System.Console.WriteLine($"   {pageData.Summary}");
        }

        System.Console.WriteLine();
        System.Console.WriteLine("📝 Body preview (first 300 chars):");
        var bodyPreview = pageData.Body?.Length > 300
            ? pageData.Body.Substring(0, 300) + "..."
            : pageData.Body ?? "(empty)";
        System.Console.WriteLine($"   {bodyPreview}");

        if (pageData.Routes?.Count > 0)
        {
            System.Console.WriteLine();
            System.Console.WriteLine("🔗 Top 5 Routes:");
            foreach (var route in pageData.Routes.Take(5))
            {
                var adFlag = route.IsPotentialAd ? " [AD]" : "";
                System.Console.WriteLine($"   • {route.Text}: {route.Url}{adFlag}");
            }
        }

        System.Console.WriteLine();
        System.Console.WriteLine("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
        System.Console.WriteLine();
        System.Console.WriteLine("✅ Demo completed successfully!");
    }
}