using System;
using System.IO;
using System.Text.Json.Serialization;
using DysonNetwork.Drive.Data;
using DysonNetwork.Drive.Extensions;
using DysonNetwork.Drive.Interfaces;
using DysonNetwork.Drive.Models;
using DysonNetwork.Drive.Services;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Diagnostics.HealthChecks;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.OpenApi.Models;
using NodaTime;
using Npgsql;

var builder = WebApplication.CreateBuilder(args);

// Add configuration
var configuration = builder.Configuration;

// Add services to the container.
builder.Services.AddControllers()
    .AddJsonOptions(options =>
    {
        options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
        options.JsonSerializerOptions.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull;
    });

// Add NodaTime
builder.Services.AddSingleton<IClock>(SystemClock.Instance);

// Add database context
builder.Services.AddDbContext<AppDatabase>((serviceProvider, options) =>
{
    var connectionString = configuration.GetConnectionString("DefaultConnection");
    if (string.IsNullOrEmpty(connectionString))
    {
        throw new InvalidOperationException("Database connection string 'DefaultConnection' not found.");
    }
    
    options.UseNpgsql(
        connectionString,
        npgsqlOptions =>
        {
            npgsqlOptions.UseNodaTime();
            npgsqlOptions.MigrationsAssembly(typeof(Program).Assembly.FullName);
        });
    
    options.UseSnakeCaseNamingConvention();
});

// Register services
builder.Services.AddScoped<IFileService, FileService>();
builder.Services.AddScoped<IFileReferenceService, FileReferenceService>();

// Configure CORS
builder.Services.AddCors(options =>
{
    options.AddDefaultPolicy(policy =>
    {
        policy.AllowAnyOrigin()
              .AllowAnyMethod()
              .AllowAnyHeader();
    });
});

// Configure JWT Authentication
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        options.Authority = configuration["Jwt:Authority"];
        options.Audience = configuration["Jwt:Audience"];
        options.RequireHttpsMetadata = !builder.Environment.IsDevelopment();
    });

// Configure Swagger
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo 
    { 
        Title = "DysonNetwork.Drive API", 
        Version = "v1",
        Description = "API for managing files and file references in the Dyson Network",
        Contact = new OpenApiContact
        {
            Name = "Dyson Network Team",
            Email = "support@dyson.network"
        }
    });
    
    // Include XML comments for API documentation
    var xmlFile = $"{typeof(Program).Assembly.GetName().Name}.xml";
    var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
    if (File.Exists(xmlPath))
    {
        c.IncludeXmlComments(xmlPath);
    }
    
    // Configure JWT Bearer Authentication for Swagger
    c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
    {
        Description = "JWT Authorization header using the Bearer scheme. Example: \"Authorization: Bearer {token}\"",
        Name = "Authorization",
        In = ParameterLocation.Header,
        Type = SecuritySchemeType.ApiKey,
        Scheme = "Bearer"
    });
    
    c.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        {
            new OpenApiSecurityScheme
            {
                Reference = new OpenApiReference
                {
                    Type = ReferenceType.SecurityScheme,
                    Id = "Bearer"
                },
                Scheme = "oauth2",
                Name = "Bearer",
                In = ParameterLocation.Header,
            },
            Array.Empty<string>()
        }
    });
});

// Configure HTTP client for external services
builder.Services.AddHttpClient();

// Add health checks
builder.Services.AddHealthChecks()
    .AddDbContextCheck<AppDatabase>();

// Add logging
builder.Services.AddLogging(configure => configure.AddConsole().AddDebug());

// Build the application
var app = builder.Build();

// Configure the HTTP request pipeline
if (app.Environment.IsDevelopment())
{
    app.UseDeveloperExceptionPage();
    app.UseSwagger();
    app.UseSwaggerUI(c => 
    {
        c.SwaggerEndpoint("/swagger/v1/swagger.json", "DysonNetwork.Drive API v1");
        c.RoutePrefix = "swagger";
    });
}

// Apply database migrations
using (var scope = app.Services.CreateScope())
{
    var services = scope.ServiceProvider;
    try
    {
        var dbContext = services.GetRequiredService<AppDatabase>();
        if (dbContext.Database.IsNpgsql())
        {
            await dbContext.Database.MigrateAsync();
            app.Logger.LogInformation("Database migrations applied successfully.");
        }
    }
    catch (Exception ex)
    {
        var logger = services.GetRequiredService<ILogger<Program>>();
        logger.LogError(ex, "An error occurred while applying database migrations.");
        throw;
    }
}

app.UseHttpsRedirection();
app.UseRouting();

app.UseCors();

app.UseAuthentication();
app.UseAuthorization();

app.MapControllers();
app.MapHealthChecks("/health");

app.Logger.LogInformation("Starting DysonNetwork.Drive application...");

await app.RunAsync();