using GB5Shared.DTO.Framework.Login;
using GB5Shared.Resource.Response;
using Microsoft.Extensions.Logging;
using TCMSBLL.Interfaces;
using TCMSDAL.DTO;
using TCMSDAL.Interfaces;

namespace TCMSBLL.Implementations;

/// <summary>
/// Business logic for MTCMSPROJECT.
/// Validates uniqueness of ProjectCode per tenant before save.
/// </summary>
public class TCMSProjectBLL : ITCMSProjectBLL
{
    private readonly ITCMSProjectDAL         _Dal;
    private readonly ILogger<TCMSProjectBLL> _Logger;

    public TCMSProjectBLL(ITCMSProjectDAL dal, ILogger<TCMSProjectBLL> logger)
    {
        _Dal    = dal;
        _Logger = logger;
    }

    public async Task<TCMSProjectDTO?> GetProjectAsync(
        int projectId, LoginDTO login, CancellationToken ct)
        => await _Dal.GetProjectAsync(projectId, login, ct).ConfigureAwait(false);

    public async Task<IEnumerable<TCMSProjectListDTO>> GetProjectListAsync(
        string? projectType, string? status, bool? isActive,
        LoginDTO login, CancellationToken ct)
        => await _Dal.GetProjectListAsync(projectType, status, isActive, login, ct).ConfigureAwait(false);

    public async Task<IEnumerable<TCMSProjectSelectDTO>> GetSelectListAsync(
        LoginDTO login, CancellationToken ct)
        => await _Dal.GetSelectListAsync(login, ct).ConfigureAwait(false);

    public async Task<string> SaveProjectAsync(
        TCMSProjectDTO dto, LoginDTO login, CancellationToken ct)
    {
        try
        {
            // Validation
            if (string.IsNullOrWhiteSpace(dto.ProjectCode))
                return "Project Code is required.";
            if (string.IsNullOrWhiteSpace(dto.ProjectName))
                return "Project Name is required.";

            bool codeExists = await _Dal.CodeExistsAsync(dto.ProjectCode, dto.ProjectId > 0 ? dto.ProjectId : null, login, ct).ConfigureAwait(false);
            if (codeExists)
                return $"Project Code '{dto.ProjectCode}' already exists.";

            bool isNew = dto.ProjectId == 0;
            if (isNew)
            {
                int newId = await _Dal.SaveProjectAsync(dto, login, ct).ConfigureAwait(false);
                return $"{SuccessResponse.SaveSuccessMessage} {newId}";
            }
            else
            {
                await _Dal.UpdateProjectAsync(dto, login, ct).ConfigureAwait(false);
                return SuccessResponse.UpdateSuccess;
            }
        }
        catch (Exception ex)
        {
            _Logger.LogError(ex, "SaveProject failed for code {Code}", dto.ProjectCode);
            throw;
        }
    }
}