using System.Security.Claims;
using DrinkRateAPI.ApiModels.UserProfile;
using DrinkRateAPI.Contexts;
using DrinkRateAPI.DbEntities;
using DrinkRateAPI.Exceptions;
using Microsoft.EntityFrameworkCore;

namespace DrinkRateAPI.Services;

public class UserProfileService(ApplicationDbContext context, ApplicationUserService applicationUserService)
{
    private ApplicationDbContext _context = context;
    private ApplicationUserService _applicationUserService = applicationUserService;

    public bool IsUserProfileAdmin(DbUserProfile userProfile)
    {
        return userProfile.IsAdmin;
    }

    public async Task<UserProfileGet> PutUserProfileSelfAsync(ClaimsPrincipal identity, UserProfileSelfPut userProfileSelfPut)
    {
        var authenticatedUser = await _applicationUserService.UserProfileByApplicationUserAsync(identity);

        var userId = authenticatedUser.Id.ToString();
        await PutUserProfile(userProfileSelfPut, userId, false);

        return await GetUserProfile(userId);
    }

    public async Task<UserProfileGet> GetUserProfileSelfAsync(ClaimsPrincipal identity)
    {
        var authenticatedUser = await _applicationUserService.UserProfileByApplicationUserAsync(identity);

        var userId = authenticatedUser.Id.ToString();

        return await GetUserProfile(userId);
    }

    public async Task<UserProfileGet> PutUserProfileAsync(ClaimsPrincipal identity, UserProfilePut userProfilePut, string userId)
    {
        var authenticatedUser = await _applicationUserService.UserProfileByApplicationUserAsync(identity);

        if (authenticatedUser.Id.ToString() == userId)
        {
            // Prevent admin de-admining him/herself
            await PutUserProfile(userProfilePut, userId, false);
        }
        else
        {
            await PutUserProfile(userProfilePut, userId, IsUserProfileAdmin(authenticatedUser));
        }

        return await GetUserProfile(userId);
    }

    public async Task<UserProfileGet> GetUserProfileAsync(ClaimsPrincipal identity, string userId)
    {
        var authenticatedUser = await _applicationUserService.UserProfileByApplicationUserAsync(identity);

        return await GetUserProfile(userId);
    }

    private async Task PutUserProfile<TUserProfilePut>(TUserProfilePut userProfilePut, string userId, bool byAdmin) where TUserProfilePut : UserProfileSelfPut
    {
        var userProfile = await GetUserProfileById(userId);

        if (!string.IsNullOrEmpty(userProfilePut.UserName) && userProfile.UserName != userProfilePut.UserName)
        {
            var userByName = await TryGetUserProfileByUserName(userProfilePut.UserName);
            if (userByName == null)
            {
                userProfile.UserName = userProfilePut.UserName;
            }
            else
            {
                throw new BadRequestException($"User with username {userProfilePut.UserName} already exists");
            }
        }

        if (byAdmin && userProfilePut is UserProfilePut adminPut && adminPut.IsAdmin != null)
        {
            userProfile.IsAdmin = (bool)adminPut.IsAdmin;
        }

        _context.UserProfiles.Update(userProfile);
        await _context.SaveChangesAsync();
    }

    private async Task<UserProfileGet> GetUserProfile(string userId)
    {
        var userProfile = await GetUserProfileById(userId);

        var userProfileGet = new UserProfileGet
        {
            Id = userProfile.Id.ToString(),
            UserName = userProfile.UserName,
            IsAdmin = userProfile.IsAdmin,
            IsDeleted = userProfile.IsDeleted,
            ApplicationUserId = userProfile.ApplicationUserId.ToString(),
        };

        return userProfileGet;
    }

    private async Task<DbUserProfile> GetUserProfileById(string userId)
    {
        var userProfile = await _context.UserProfiles.FirstOrDefaultAsync(x => x.Id.ToString() == userId);

        return userProfile ?? throw new NotFoundException();
    }

    private async Task<DbUserProfile?> TryGetUserProfileByUserName(string userName)
    {
        var userProfile = await _context.UserProfiles.FirstOrDefaultAsync(x => x.UserName == userName);

        return userProfile;
    }
}