using System.Security.Claims;
using Microsoft.EntityFrameworkCore;
using ProposalSystem.Application.Interfaces;
using ProposalSystem.Domain.Entities;
using ProposalSystem.Infrastructure.Data;

namespace ProposalSystem.Api.Services;

public class CurrentUserService : ICurrentUserService
{
    private readonly IHttpContextAccessor _httpContext;
    private readonly ProposalDbContext _db;
    private User? _cachedUser;

    public CurrentUserService(IHttpContextAccessor httpContext, ProposalDbContext db)
    {
        _httpContext = httpContext;
        _db = db;
    }

    public Guid UserId => GetUser().Id;
    public string Email => GetUser().Email;
    public UserRole Role => GetUser().Role;

    public string? IpAddress =>
        _httpContext.HttpContext?.Connection.RemoteIpAddress?.ToString();

    public async Task ResolveAsync()
    {
        if (_cachedUser != null) return;

        var principal = _httpContext.HttpContext?.User
            ?? throw new UnauthorizedAccessException("No authenticated user");

        var userId = principal.FindFirstValue(ClaimTypes.NameIdentifier);
        var sub = principal.FindFirstValue("sub");

        if (userId != null && Guid.TryParse(userId, out var parsedId))
        {
            _cachedUser = await _db.Users.FirstOrDefaultAsync(u => u.Id == parsedId);
        }

        if (_cachedUser == null && sub != null)
        {
            _cachedUser = await _db.Users.FirstOrDefaultAsync(u => u.CognitoSub == sub);
        }

        if (_cachedUser == null)
        {
            var email = principal.FindFirstValue(ClaimTypes.Email)
                ?? principal.FindFirstValue("email")
                ?? "unknown@seahaven.com";

            _cachedUser = await _db.Users.FirstOrDefaultAsync(u => u.Email == email);
        }

        if (_cachedUser == null)
        {
            var email = principal.FindFirstValue(ClaimTypes.Email)
                ?? principal.FindFirstValue("email")
                ?? "unknown@seahaven.com";

            var name = principal.FindFirstValue("name")
                ?? email.Split('@')[0];

            var groups = principal.FindAll("cognito:groups")
                .Select(c => c.Value).ToList();

            var role = groups.Contains("sysadmins") ? UserRole.SysAdmin
                : groups.Contains("admins") ? UserRole.Admin
                : UserRole.Dispatcher;

            _cachedUser = new User
            {
                Id = Guid.NewGuid(),
                CognitoSub = sub ?? $"auto-{Guid.NewGuid():N}",
                Email = email,
                DisplayName = name,
                Role = role,
                IsActive = true,
                CreatedAt = DateTime.UtcNow,
                UpdatedAt = DateTime.UtcNow,
            };

            _db.Users.Add(_cachedUser);
            await _db.SaveChangesAsync();
        }
    }

    private User GetUser()
    {
        if (_cachedUser != null) return _cachedUser;

        var principal = _httpContext.HttpContext?.User
            ?? throw new UnauthorizedAccessException("No authenticated user");

        var userId = principal.FindFirstValue(ClaimTypes.NameIdentifier);
        var sub = principal.FindFirstValue("sub");

        if (userId != null && Guid.TryParse(userId, out var parsedId))
        {
            _cachedUser = _db.Users.FirstOrDefault(u => u.Id == parsedId);
        }

        if (_cachedUser == null && sub != null)
        {
            _cachedUser = _db.Users.FirstOrDefault(u => u.CognitoSub == sub);
        }

        if (_cachedUser == null)
        {
            var email = principal.FindFirstValue(ClaimTypes.Email)
                ?? principal.FindFirstValue("email")
                ?? "unknown@seahaven.com";

            _cachedUser = _db.Users.FirstOrDefault(u => u.Email == email);
        }

        if (_cachedUser == null)
        {
            var email = principal.FindFirstValue(ClaimTypes.Email)
                ?? principal.FindFirstValue("email")
                ?? "unknown@seahaven.com";

            var name = principal.FindFirstValue("name")
                ?? email.Split('@')[0];

            var groups = principal.FindAll("cognito:groups")
                .Select(c => c.Value).ToList();

            var role = groups.Contains("sysadmins") ? UserRole.SysAdmin
                : groups.Contains("admins") ? UserRole.Admin
                : UserRole.Dispatcher;

            _cachedUser = new User
            {
                Id = Guid.NewGuid(),
                CognitoSub = sub ?? $"auto-{Guid.NewGuid():N}",
                Email = email,
                DisplayName = name,
                Role = role,
                IsActive = true,
                CreatedAt = DateTime.UtcNow,
                UpdatedAt = DateTime.UtcNow,
            };

            _db.Users.Add(_cachedUser);
            _db.SaveChanges();
        }

        return _cachedUser;
    }
}