using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.ChatCompletion;
using VideoStudy.Shared;
using Microsoft.AspNetCore.RateLimiting;
using System.Threading.RateLimiting;
using VideoStudy.API.Services;

#pragma warning disable SKEXP0010 // Ollama connector is experimental

var builder = WebApplication.CreateBuilder(args);

// Add Services
builder.Services.AddScoped<AnalysisService>();

// Add CORS
builder.Services.AddCors(options =>
{
    options.AddPolicy("AllowAll", policyBuilder =>
    {
        policyBuilder
            .AllowAnyOrigin()
            .AllowAnyMethod()
            .AllowAnyHeader();
    });
});

// Add Swagger
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

// Configure AI Provider (Ollama or Groq)
var aiProvider = builder.Configuration["LlmSettings:Provider"] ?? "Ollama";

builder.Services.AddKernel();

if (aiProvider.Equals("Ollama", StringComparison.OrdinalIgnoreCase))
{
    var ollamaUrl = builder.Configuration["LlmSettings:Ollama:BaseUrl"] ?? "http://localhost:11434";
    var ollamaModel = builder.Configuration["LlmSettings:Ollama:Model"] ?? "llama3.1";

    builder.Services.AddOpenAIChatCompletion(
        modelId: ollamaModel,
        apiKey: "ollama",
        endpoint: new Uri($"{ollamaUrl}/v1")
    );
}
else if (aiProvider.Equals("Groq", StringComparison.OrdinalIgnoreCase))
{
    var groqApiKey = builder.Configuration["LlmSettings:Groq:ApiKey"]
        ?? builder.Configuration["LlmSettings:ApiKey"]
        ?? Environment.GetEnvironmentVariable("GROQ_API_KEY")
        ?? "";

    var groqModel = builder.Configuration["LlmSettings:Groq:Model"]
        ?? builder.Configuration["LlmSettings:ModelId"]
        ?? "llama-3.3-70b-versatile";

    var groqBaseUrl = builder.Configuration["LlmSettings:Groq:BaseUrl"]
        ?? builder.Configuration["LlmSettings:Endpoint"]
        ?? "https://api.groq.com/openai/v1";

    builder.Services.AddOpenAIChatCompletion(
        modelId: groqModel,
        apiKey: groqApiKey,
        endpoint: new Uri(groqBaseUrl)
    );
}

// Add Rate Limiting
builder.Services.AddRateLimiter(options =>
{
    options.AddFixedWindowLimiter("api", opt =>
    {
        opt.Window = TimeSpan.FromMinutes(1);
        opt.PermitLimit = 60;
    });
});

var app = builder.Build();

// Enable Rate Limiting
app.UseRateLimiter();

// Enable Swagger
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseCors("AllowAll");

app.MapGet("/health", () => Results.Ok(new { status = "healthy", timestamp = DateTime.UtcNow }));

// Video info endpoint (lightweight preview)
app.MapGet("/api/video-info", async (string url, AnalysisService service) =>
{
    try
    {
        var info = await service.GetVideoInfoAsync(url, CancellationToken.None);
        return Results.Ok(info);
    }
    catch (Exception ex)
    {
        return Results.BadRequest(new { error = ex.Message });
    }
})
.WithName("GetVideoInfo");

// Main analysis endpoint
app.MapPost("/api/analyze", (AnalysisRequest request, AnalysisService service, CancellationToken cancellationToken) =>
{
    return service.AnalyzeVideoAsync(request, cancellationToken);
})
.WithName("AnalyzeVideo");

app.Run();

#pragma warning restore SKEXP0010