using Core.Blueprint.Common.DependencyInjection;
using Furniture.Bff.Application.Adapters;
using Furniture.Bff.Application.DependencyInjection;
using Furniture.Bff.Application.Handlers;
using Furniture.Bff.Contracts.Api;
using Furniture.Bff.Rest.Adapters;
using Furniture.Bff.Rest.Endpoints;
using Furniture.Service.Grpc;
using Microsoft.Extensions.Primitives;

const string CorrelationHeaderName = "x-correlation-id";

var builder = WebApplication.CreateBuilder(args);
var edgeProtocol = builder.Configuration["FurnitureBff:EdgeProtocol"] ?? "rest";
if (!string.Equals(edgeProtocol, "rest", StringComparison.OrdinalIgnoreCase))
{
    throw new InvalidOperationException(
        $"Furniture BFF supports one active edge protocol per deployment. Configured: '{edgeProtocol}'. Expected: 'rest'.");
}

builder.Services.AddHttpContextAccessor();
builder.Services.AddHealthChecks();
builder.Services.AddBlueprintRuntimeCore();
builder.Services.AddFurnitureBffApplicationRuntime();
builder.Services.AddScoped<IFurnitureServiceClient, FurnitureServiceGrpcClientAdapter>();
builder.Services.AddGrpcClient<FurnitureRuntime.FurnitureRuntimeClient>(options =>
{
    var serviceAddress = builder.Configuration["FurnitureService:GrpcAddress"] ?? "http://localhost:5252";
    options.Address = new Uri(serviceAddress);
});

var app = builder.Build();

app.Use(async (context, next) =>
{
    var correlationId = ResolveCorrelationId(context);
    context.Items[CorrelationHeaderName] = correlationId;
    context.Request.Headers[CorrelationHeaderName] = correlationId;
    context.Response.Headers[CorrelationHeaderName] = correlationId;
    await next();
});

app.MapGet($"{EndpointConventions.ApiPrefix}/{{furnitureId}}/availability", async (
    string furnitureId,
    HttpContext context,
    IGetFurnitureAvailabilityHandler handler) =>
{
    var request = new GetFurnitureAvailabilityApiRequest(
        furnitureId,
        ResolveCorrelationId(context));

    var response = await handler.HandleAsync(request);
    return Results.Ok(response);
});

app.MapHealthChecks("/healthz");

app.Run();

string ResolveCorrelationId(HttpContext context)
{
    if (context.Items.TryGetValue(CorrelationHeaderName, out var itemValue) &&
        itemValue is string itemCorrelationId &&
        !string.IsNullOrWhiteSpace(itemCorrelationId))
    {
        return itemCorrelationId;
    }

    if (context.Request.Headers.TryGetValue(CorrelationHeaderName, out var headerValue) &&
        !StringValues.IsNullOrEmpty(headerValue))
    {
        return headerValue.ToString();
    }

    return context.TraceIdentifier;
}