using Distribution.Infra.UoW;
using Microsoft.AspNetCore.Identity;

namespace Distribution.Features.User;

public class UserService(IUserRepository repo, IUnitOfWork uow)
{
    private readonly PasswordHasher<Models.User> _hasher = new();

    private static UserResponse ToResponse(Models.User u) =>
        new(u.Id, u.Username, u.FullName, u.FK_RoleId, u.Role?.Name ?? string.Empty,
            u.FK_ReportsToUserId, u.IsActive, u.CreatedAt, u.UpdatedAt);

    public async Task<List<UserResponse>> GetAllAsync() =>
        (await repo.GetAllAsync())
            .Where(u => u.IsActive)
            .Select(ToResponse)
            .ToList();

    public async Task<UserResponse?> GetByIdAsync(Guid id)
    {
        var user = await repo.GetByIdAsync(id);
        if (user is null || !user.IsActive) return null;
        return ToResponse(user);
    }

    public async Task<UserResponse> CreateAsync(CreateUserRequest request, CancellationToken ct = default)
    {
        var user = new Models.User
        {
            Username = request.Username,
            FullName = request.FullName,
            FK_RoleId = request.RoleId,
            FK_ReportsToUserId = request.ReportsToUserId
        };
        user.PasswordHash = _hasher.HashPassword(user, request.Password);

        await uow.BeginAsync(ct);
        try
        {
            await repo.AddAsync(user);
            await uow.CommitAsync(ct);
        }
        catch
        {
            await uow.RollbackAsync(ct);
            throw;
        }
        return ToResponse(user);
    }

    public async Task<UserResponse?> UpdateAsync(Guid id, UpdateUserRequest request, CancellationToken ct = default)
    {
        var user = await repo.GetByIdAsync(id);
        if (user is null || !user.IsActive) return null;
        user.FullName = request.FullName;
        user.UpdatedAt = DateTime.Now;
        await uow.BeginAsync(ct);
        try
        {
            repo.Update(user);
            await uow.CommitAsync(ct);
        }
        catch
        {
            await uow.RollbackAsync(ct);
            throw;
        }
        return ToResponse(user);
    }

    public async Task<UserResponse?> AssignRoleAsync(Guid id, AssignUserRoleRequest request, CancellationToken ct = default)
    {
        var user = await repo.GetByIdAsync(id);
        if (user is null || !user.IsActive) return null;
        user.FK_RoleId = request.RoleId;
        user.UpdatedAt = DateTime.Now;
        await uow.BeginAsync(ct);
        try
        {
            repo.Update(user);
            await uow.CommitAsync(ct);
        }
        catch
        {
            await uow.RollbackAsync(ct);
            throw;
        }
        return ToResponse(user);
    }

    public async Task<bool> AssignScopeAsync(Guid id, AssignUserScopeRequest request, CancellationToken ct = default)
    {
        var user = await repo.GetByIdAsync(id);
        if (user is null || !user.IsActive) return false;

        await uow.BeginAsync(ct);
        try
        {
            await repo.ReplaceRegionScopesAsync(id, request.RegionIds);
            await repo.ReplaceRouteScopesAsync(id, request.RouteIds);
            await repo.ReplaceStoreScopesAsync(id, request.StoreIds);
            await uow.CommitAsync(ct);
        }
        catch
        {
            await uow.RollbackAsync(ct);
            throw;
        }
        return true;
    }

    public async Task<bool> DeactivateAsync(Guid id, CancellationToken ct = default)
    {
        var user = await repo.GetByIdAsync(id);
        if (user is null || !user.IsActive) return false;
        await uow.BeginAsync(ct);
        try
        {
            repo.Remove(user);
            await uow.CommitAsync(ct);
        }
        catch
        {
            await uow.RollbackAsync(ct);
            throw;
        }
        return true;
    }
}