using System.Text;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using Newsbot.Collector.Api.Domain.Consts;
using Newsbot.Collector.Domain.Models.Config;

namespace Newsbot.Collector.Api.Startup;

public static class IdentityStartup
{
    public static void DefineJwtRequirements(IServiceCollection services, IConfiguration config)
    {
        // Configure JWT for auth and load it into DI so we can use it in the controllers

        var jwtSettings = new JwtSettings();
        config.Bind(nameof(jwtSettings), jwtSettings);
        services.AddSingleton(jwtSettings);
        
        // Configure how the Token Validation will be handled
        var tokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuerSigningKey = true,
            IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(jwtSettings.Secret ?? "")),
            ValidateIssuer = false,
            ValidateAudience = false,
            RequireExpirationTime = false,
            ValidateLifetime = true
        };
        services.AddSingleton(tokenValidationParameters);
        
        // Build the Authentication that will be used
        services.AddAuthentication(x =>
        {
            x.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
            x.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
            x.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
        }).AddJwtBearer(x =>
        {
            x.SaveToken = true;
            x.TokenValidationParameters = tokenValidationParameters;
        });
        
        // Build the Authorization Policy that the users will conform to.
        services.AddAuthorization(options =>
        {
            options.AddPolicy(Authorization.AdministratorPolicy,
                b => b.RequireRole(Authorization.AdministratorsRole, "true"));
            options.AddPolicy(Authorization.UserPolicy, 
                b => b.RequireRole(Authorization.UsersRole, "true"));
        });
    }
}