using System.Text;
using Azaion.Common;
using Azaion.Common.Configs;
using Azaion.Common.Database;
using Azaion.Common.Entities;
using Azaion.Common.Requests;
using Azaion.Services;
using FluentValidation;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Models;
using Serilog;

Log.Logger = new LoggerConfiguration()
    .Enrich.FromLogContext()
    .MinimumLevel.Information()
    .WriteTo.Console()
    .WriteTo.File(
        path: "logs/log.txt",
        rollingInterval: RollingInterval.Day)
    .CreateLogger();

var builder = WebApplication.CreateBuilder(args);
builder.WebHost.ConfigureKestrel(o => o.Limits.MaxRequestBodySize = 209715200); //increase upload limit up to 200mb

var jwtConfig = builder.Configuration.GetSection(nameof(JwtConfig)).Get<JwtConfig>();
if (jwtConfig == null || string.IsNullOrEmpty(jwtConfig.Secret))
    throw new Exception("Missing configuration section: JwtConfig");
var signingKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(jwtConfig.Secret));

builder.Services.AddSerilog();
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(o =>
    {
        o.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidateLifetime = true,
            ValidateIssuerSigningKey = true,
            ValidIssuer = jwtConfig.Issuer,
            ValidAudience = jwtConfig.Audience,
            IssuerSigningKey = signingKey
        };
    });

#region Policies

var apiAdminPolicy = new AuthorizationPolicyBuilder()
    .RequireRole(RoleEnum.ApiAdmin.ToString()).Build();

var apiUploaderPolicy = new AuthorizationPolicyBuilder()
    .RequireRole(RoleEnum.ResourceUploader.ToString(), RoleEnum.ApiAdmin.ToString()).Build();

builder.Services.AddAuthorization(o =>
{
    o.AddPolicy(nameof(apiAdminPolicy), apiAdminPolicy);
    o.AddPolicy(nameof(apiUploaderPolicy), apiUploaderPolicy);
});

#endregion Policies


builder.Services.AddHttpContextAccessor();

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo {Title = "Azaion.API", Version = "v1"});
    c.CustomSchemaIds(type => type.ToString());
    var jwtSecurityScheme = new OpenApiSecurityScheme
    {
        Scheme = "bearer",
        BearerFormat = "JWT",
        Name = "JWT Authentication",
        In = ParameterLocation.Header,
        Type = SecuritySchemeType.Http,
        Description = "Put **_ONLY_** your JWT Bearer token on textbox below!",

        Reference = new OpenApiReference
        {
            Id = JwtBearerDefaults.AuthenticationScheme,
            Type = ReferenceType.SecurityScheme
        }
    };

    c.AddSecurityDefinition(jwtSecurityScheme.Reference.Id, jwtSecurityScheme);

    c.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        { jwtSecurityScheme, Array.Empty<string>() }
    });
});
builder.Services.Configure<ResourcesConfig>(builder.Configuration.GetSection(nameof(ResourcesConfig)));
builder.Services.Configure<JwtConfig>(builder.Configuration.GetSection(nameof(JwtConfig)));
builder.Services.Configure<ConnectionStrings>(builder.Configuration.GetSection(nameof(ConnectionStrings)));

builder.Services.AddScoped<IUserService, UserService>();
builder.Services.AddScoped<IResourcesService, ResourcesService>();
builder.Services.AddSingleton<IAuthService, AuthService>();
builder.Services.AddSingleton<IDbFactory, DbFactory>();

builder.Services.AddValidatorsFromAssemblyContaining<RegisterUserValidator>();

var app = builder.Build();

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

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

app.MapPost("/login",
    async (LoginRequest request, IUserService userService, IAuthService authService, CancellationToken cancellationToken) =>
    {
        var user = await userService.ValidateUser(request, cancellationToken: cancellationToken);
        return Results.Ok(new { Token = authService.CreateToken(user)});
    })
    .WithOpenApi(op => new(op){ Summary = "Login"});;

app.MapPost("/users",
    async (RegisterUserRequest registerUserRequest, IUserService userService, CancellationToken cancellationToken)
        => await userService.RegisterUser(registerUserRequest, cancellationToken))
    .RequireAuthorization(apiAdminPolicy)
    .WithOpenApi(op => new(op){ Summary = "Creates a new user"});

app.MapGet("/users",
    async (string? searchEmail, RoleEnum? searchRole, IUserService userService, CancellationToken cancellationToken)
        => await userService.GetUsers(searchEmail, searchRole, cancellationToken))
    .RequireAuthorization(apiAdminPolicy)
    .WithOpenApi(op => new(op){ Summary = "List users by criteria"});

app.MapPost("/resources",
        async (IFormFile data, IResourcesService resourceService, CancellationToken cancellationToken)
            => await resourceService.SaveResource(data, cancellationToken))
    .Accepts<IFormFile>("multipart/form-data")
    .RequireAuthorization(apiUploaderPolicy)
    .DisableAntiforgery();

app.MapPost("/resources/get", //Need to have POST method for secure password
    async ([FromBody]GetResourceRequest request, IAuthService authService, IUserService userService, IResourcesService resourcesService, CancellationToken cancellationToken) =>
    {
        var user = authService.CurrentUser;
        if (user == null)
            throw new UnauthorizedAccessException();

        await userService.CheckHardware(user, request);

        var key = Security.MakeEncryptionKey(user.Email, request.Password, request.Hardware.Hash);
        var stream = await resourcesService.GetEncryptedResource(request.FileName, key, cancellationToken);

        return Results.File(stream, "application/octet-stream", request.FileName);
    }).RequireAuthorization()
    .WithOpenApi(op => new OpenApiOperation(op){ Summary = "Gets encrypted by users Password and HardwareHash resources. POST method for secure password"});

app.MapPut("/resources/reset-hardware",
    async (string email, IUserService userService, CancellationToken cancellationToken)
        => await userService.UpdateHardware(email, new HardwareInfo(), cancellationToken))
    .WithOpenApi(op => new OpenApiOperation(op){ Summary = "Resets hardware id in case of hardware change"});

app.Run();