using Microsoft.Extensions.Logging;
using QYZH.InteractiveMagazine.IService;
using QYZH.InteractiveMagazine.Models.Common;
using QYZH.InteractiveMagazine.Models.Dto;
using QYZH.InteractiveMagazine.Models.Entity;
using QYZH.InteractiveMagazine.Repository;

namespace QYZH.InteractiveMagazine.Service;

/// <summary>
/// 基础服务实现
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
public class BaseService<T> : IBaseService<T> where T : class, new()
{
    protected readonly IBaseRepository<T> _repository;
    protected readonly ILogger<BaseService<T>> _logger;

    /// <summary>
    /// 构造函数
    /// </summary>
    /// <param name="repository">基础仓储</param>
    /// <param name="logger">日志记录器</param>
    public BaseService(IBaseRepository<T> repository, ILogger<BaseService<T>> logger)
    {
        _repository = repository;
        _logger = logger;
    }

    /// <summary>
    /// 根据ID获取实体
    /// </summary>
    /// <param name="id">实体ID</param>
    /// <returns>实体对象</returns>
    public async Task<T?> GetByIdAsync(long id)
    {
        _logger.LogInformation("正在获取实体，ID: {Id}", id);

        var entity = await _repository.GetByIdAsync(id);

        if (entity == null)
        {
            _logger.LogWarning("未找到实体，ID: {Id}", id);
            throw new BusinessException($"未找到ID为{id}的记录", 404);
        }

        return entity;
    }

    /// <summary>
    /// 获取所有实体列表
    /// </summary>
    /// <returns>实体列表</returns>
    public async Task<List<T>> GetListAsync()
    {
        _logger.LogInformation("正在获取所有实体列表");
        return await _repository.GetListAsync();
    }

    /// <summary>
    /// 获取分页列表
    /// </summary>
    /// <param name="pageQuery">分页查询参数</param>
    /// <returns>分页数据</returns>
    public async Task<PageListModel<T>> GetPageListAsync(PageQueryModel pageQuery)
    {
        _logger.LogInformation("正在获取分页列表，页码: {PageIndex}, 每页条数: {PageSize}", pageQuery.PageIndex, pageQuery.PageSize);

        if (pageQuery.PageIndex <= 0)
        {
            throw new BusinessException("页码必须大于0", 400);
        }

        if (pageQuery.PageSize <= 0 || pageQuery.PageSize > 100)
        {
            throw new BusinessException("每页条数必须在1-100之间", 400);
        }

        return await _repository.GetPageListAsync(x => true, pageQuery);
    }

    /// <summary>
    /// 新增实体
    /// </summary>
    /// <param name="entity">实体对象</param>
    /// <returns>是否成功</returns>
    public async Task<bool> InsertAsync(T entity)
    {
        if (entity == null)
        {
            throw new BusinessException("实体对象不能为空", 400);
        }

        _logger.LogInformation("正在新增实体，类型: {EntityType}", typeof(T).Name);

        SetAuditFieldsOnInsert(entity);

        var result = await _repository.InsertAsync(entity);

        if (result)
        {
            _logger.LogInformation("实体新增成功");
        }
        else
        {
            _logger.LogError("实体新增失败");
            throw new BusinessException("新增记录失败", 500);
        }

        return result;
    }

    /// <summary>
    /// 更新实体
    /// </summary>
    /// <param name="entity">实体对象</param>
    /// <returns>是否成功</returns>
    public async Task<bool> UpdateAsync(T entity)
    {
        if (entity == null)
        {
            throw new BusinessException("实体对象不能为空", 400);
        }

        _logger.LogInformation("正在更新实体，类型: {EntityType}", typeof(T).Name);

        SetAuditFieldsOnUpdate(entity);

        var result = await _repository.UpdateAsync(entity);

        if (result)
        {
            _logger.LogInformation("实体更新成功");
        }
        else
        {
            _logger.LogError("实体更新失败");
            throw new BusinessException("更新记录失败", 500);
        }

        return result;
    }

    /// <summary>
    /// 根据ID删除实体
    /// </summary>
    /// <param name="id">实体ID</param>
    /// <returns>是否成功</returns>
    public async Task<bool> DeleteByIdAsync(long id)
    {
        _logger.LogInformation("正在删除实体，ID: {Id}", id);

        var entity = await _repository.GetByIdAsync(id);

        if (entity == null)
        {
            _logger.LogWarning("未找到要删除的实体，ID: {Id}", id);
            throw new BusinessException($"未找到ID为{id}的记录", 404);
        }

        var result = await _repository.DeleteByIdAsync(id);

        if (result)
        {
            _logger.LogInformation("实体删除成功，ID: {Id}", id);
        }
        else
        {
            _logger.LogError("实体删除失败，ID: {Id}", id);
            throw new BusinessException("删除记录失败", 500);
        }

        return result;
    }

    /// <summary>
    /// 设置插入时的审计字段
    /// </summary>
    /// <param name="entity">实体对象</param>
    private static void SetAuditFieldsOnInsert(T entity)
    {
        if (entity is BaseEntity baseEntity)
        {
            var now = DateTime.Now;
            baseEntity.CreatedAt = now;
            baseEntity.UpdatedAt = now;
            baseEntity.CreatedBy = baseEntity.CreatedBy ?? "system";
            baseEntity.UpdatedBy = baseEntity.UpdatedBy ?? "system";
            baseEntity.IsDeleted = false;
        }
    }

    private static void SetAuditFieldsOnUpdate(T entity)
    {
        if (entity is BaseEntity baseEntity)
        {
            baseEntity.UpdatedAt = DateTime.Now;
            baseEntity.UpdatedBy = baseEntity.UpdatedBy ?? "system";
        }
    }
}