using AutoMapper;
using DMS.Core.Interfaces;
using DMS.Core.Models;
using DMS.Application.DTOs;
using DMS.Application.Interfaces;

namespace DMS.Application.Services;

/// <summary>
/// 实现变量管理的应用服务。
/// </summary>
public class VariableAppService : IVariableAppService
{
    private readonly IRepositoryManager _repoManager;
    private readonly IMapper _mapper;

    public VariableAppService(IRepositoryManager repoManager, IMapper mapper)
    {
        _repoManager = repoManager;
        _mapper = mapper;
    }

    public async Task<VariableDto> GetVariableByIdAsync(int id)
    {
        var variable = await _repoManager.Variables.GetByIdAsync(id);
        return _mapper.Map<VariableDto>(variable);
    }

    public async Task<List<VariableDto>> GetAllVariablesAsync()
    {
        var variables = await _repoManager.Variables.GetAllAsync();
        return _mapper.Map<List<VariableDto>>(variables);
    }

    public async Task<int> CreateVariableAsync(VariableDto variableDto)
    {
        try
        {
            _repoManager.BeginTranAsync();
            var variable = _mapper.Map<Variable>(variableDto);
            await _repoManager.Variables.AddAsync(variable);
            await _repoManager.CommitAsync();
            return variable.Id;
        }
        catch (Exception ex)
        {
            await _repoManager.RollbackAsync();
            throw new ApplicationException("创建变量时发生错误，操作已回滚。", ex);
        }
    }

    public async Task UpdateVariableAsync(VariableDto variableDto)
    {
        try
        {
            _repoManager.BeginTranAsync();
            var variable = await _repoManager.Variables.GetByIdAsync(variableDto.Id);
            if (variable == null)
            {
                throw new ApplicationException($"Variable with ID {variableDto.Id} not found.");
            }
            _mapper.Map(variableDto, variable);
            await _repoManager.Variables.UpdateAsync(variable);
            await _repoManager.CommitAsync();
        }
        catch (Exception ex)
        {
            await _repoManager.RollbackAsync();
            throw new ApplicationException("更新变量时发生错误，操作已回滚。", ex);
        }
    }

    public async Task DeleteVariableAsync(int id)
    {
        try
        {
            _repoManager.BeginTranAsync();
            await _repoManager.Variables.DeleteByIdAsync(id);
            await _repoManager.CommitAsync();
        }
        catch (Exception ex)
        {
            await _repoManager.RollbackAsync();
            throw new ApplicationException("删除变量时发生错误，操作已回滚。", ex);
        }
    }
}