using PostFundManagement.Domain;
using PostFundManagement.Domain.Abstractions;
using PostFundManagement.Domain.Api;
using PostFundManagement.Domain.Extensions;
using PostFundManagement.Infrastructure.Database;

namespace PostFundManagement.Api.Endpoints.Users;

[ApiVersionTarget(1)]
public class SyncUserEndpoint : IEndpoint
{
    public void Map(IEndpointRouteBuilder builder)
    {
        builder.MapPost("api/users/sync", async (ClaimsPrincipal principal, 
            IDbContextFactory<ApplicationDbContext> contextFactory, CancellationToken cancellationToken = default) =>
        {
            var sidClaim = principal.FindFirst("sid")?.Value ?? principal.FindFirst(ClaimTypes.Sid)?.Value;
            var emailClaim = principal.FindFirst("email")?.Value ?? principal.FindFirst(ClaimTypes.Email)?.Value;

            if (string.IsNullOrWhiteSpace(sidClaim))
                return Results.BadRequest("Missing 'sid' claim in user token.");

            if (!Guid.TryParse(sidClaim, out var userId))
                userId = new Guid(System.Security.Cryptography.MD5.HashData(System.Text.Encoding.UTF8.GetBytes(sidClaim)));

            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var user = await context.Users.FirstOrDefaultAsync(u => u.Id == userId, cancellationToken);
            var isNew = user == null;

            if (isNew)
            {
                user = new Domain.Entities.User
                {
                    Id = userId,
                    Email = emailClaim,
                    Status = ActivityStatus.Active,
                    LastLoginAt = DateTime.UtcNow
                };

                context.Users.Add(user);
            }
            else
            {
                user!.Email = emailClaim;
                user.LastLoginAt = DateTime.UtcNow;
                context.Users.Update(user);
            }

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Results.Ok(user)
                : Results.BadRequest("Failed to sync user");
        })
        .RequireAuthorization()
        .WithDescription("Synchronise caller user profile using id_token's SID, inserting/updating user details in database")
        .WithName(typeof(SyncUserEndpoint).ToEndpointName())
        .MapToApiVersion(new ApiVersion(1))
        .Produces<Domain.Entities.User>(StatusCodes.Status200OK)
        .Produces(StatusCodes.Status400BadRequest)
        .Produces(StatusCodes.Status401Unauthorized)
        .WithTags(EndpointTags.Users);
    }
}