using System.Linq.Expressions;
using Fake.Application;
using Microsoft.AspNetCore.Mvc;
using Oms.Application.Dtos.Channels;
using Oms.Application.Dtos.Shared;
using Oms.Application.Shared;
using Oms.Domain.ChannelsAggregate.Entities;
using Oms.Domain.ChannelsAggregate.Repositories;

namespace Oms.Application.Services.Channels;

/// <summary>
/// 自动触发规则 API 服务。
/// </summary>
[ApiExplorerSettings(GroupName = "OMS-Channel")]
public class AutoTriggerService : ApplicationService
{
    private IAutoTriggerRepository AutoTriggerRepository => LazyServiceProvider.GetRequiredService<IAutoTriggerRepository>();

    /// <summary>
    /// 查询自动触发规则列表。
    /// </summary>
    /// <param name="input">入参：自动触发规则列表查询条件。</param>
    /// <returns>自动触发规则分页结果，包含列表数据和总记录数。</returns>
    [HttpGet("/channel/auto-trigger/list")]
    public async Task<OmsPageResult<AutoTriggerOutput>> GetListAsync([FromQuery] AutoTriggerListInput input)
    {
        var predicate = BuildListPredicate(input);
        var pageIndex = OmsDocHelper.NormalizePage(input.Page);
        var pageSize = OmsDocHelper.NormalizePageSize(input.PageSize);
        var entities = await AutoTriggerRepository.GetPagedListAsync(
            predicate,
            pageIndex,
            pageSize,
            new Dictionary<string, bool> { [nameof(AutoTrigger.UpdateTime)] = false, [nameof(AutoTrigger.Id)] = false });
        var total = await AutoTriggerRepository.CountAsync(predicate);
        var items = entities.Select(MapOutput).ToList();
        return new OmsPageResult<AutoTriggerOutput> { Items = items, Total = total };
    }

    /// <summary>
    /// 新增自动触发规则。
    /// </summary>
    /// <param name="input">入参：自动触发规则保存参数。</param>
    /// <returns>无返回体，仅完成新增自动触发规则。</returns>
    [HttpPost("/channel/auto-trigger/create")]
    public async Task CreateAsync(AutoTriggerSaveInput input)
    {
        var entity = new AutoTrigger
        {
            Status = input.Status,
            Operation = input.Operation,
            TriggerTiming = input.TriggerTiming,
            TriggerCondition = input.TriggerCondition,
            PromptMessage = input.PromptMessage,
            Notifier = input.Notifier
        };
        await AutoTriggerRepository.InsertAsync(entity);
    }

    /// <summary>
    /// 更新自动触发规则。
    /// </summary>
    /// <param name="input">入参：自动触发规则保存参数。</param>
    /// <returns>无返回体，仅完成更新自动触发规则。</returns>
    [HttpPost("/channel/auto-trigger/update")]
    public async Task UpdateAsync(AutoTriggerSaveInput input)
    {
        var entity = await GetEntityOrThrowAsync(input.Id);
        entity.Status = input.Status;
        entity.Operation = input.Operation;
        entity.TriggerTiming = input.TriggerTiming;
        entity.TriggerCondition = input.TriggerCondition;
        entity.PromptMessage = input.PromptMessage;
        entity.Notifier = input.Notifier;
        await AutoTriggerRepository.UpdateAsync(entity);
    }

    /// <summary>
    /// 删除自动触发规则。
    /// </summary>
    /// <param name="input">入参：目标主键。</param>
    /// <returns>无返回体，仅完成删除自动触发规则。</returns>
    [HttpPost("/channel/auto-trigger/delete")]
    public async Task DeleteAsync(IdInput input)
    {
        var entity = await GetEntityOrThrowAsync(input.Id);
        await AutoTriggerRepository.DeleteAsync(entity);
    }

    /// <summary>
    /// 切换自动触发规则状态。
    /// </summary>
    /// <param name="input">入参：目标主键和状态值。</param>
    /// <returns>无返回体，仅完成切换自动触发规则状态。</returns>
    [HttpPost("/channel/auto-trigger/toggleStatus")]
    public async Task ToggleStatusAsync(ToggleStatusInput input)
    {
        var entity = await GetEntityOrThrowAsync(input.Id);
        entity.Status = input.Status;
        await AutoTriggerRepository.UpdateAsync(entity);
    }

    private static Expression<Func<AutoTrigger, bool>> BuildListPredicate(AutoTriggerListInput input)
    {
        var operation = input.Operation?.Trim();
        var triggerTiming = input.TriggerTiming?.Trim();
        return entity =>
            (string.IsNullOrWhiteSpace(operation) || entity.Operation == operation) &&
            (string.IsNullOrWhiteSpace(triggerTiming) || entity.TriggerTiming == triggerTiming);
    }

    private async Task<AutoTrigger> GetEntityOrThrowAsync(int? id)
    {
        if (!id.HasValue || id.Value <= 0)
        {
            throw new BusinessException("自动触发不存在");
        }

        var entity = await AutoTriggerRepository.FirstOrDefaultAsync(x => x.Id == id.Value);
        if (entity == null)
        {
            throw new BusinessException("自动触发不存在");
        }

        return entity;
    }

    private static AutoTriggerOutput MapOutput(AutoTrigger entity)
    {
        return new AutoTriggerOutput
        {
            Id = entity.Id,
            Status = (byte)entity.Status,
            Operation = entity.Operation,
            TriggerTiming = entity.TriggerTiming,
            TriggerCondition = entity.TriggerCondition,
            PromptMessage = entity.PromptMessage,
            Notifier = entity.Notifier,
            CreateTime = entity.CreateTime,
            UpdateTime = OmsDocHelper.NullIfDefault(entity.UpdateTime)
        };
    }
}