using FreeSql;
using MAX.Core.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
using Store.Modules.CloudProduct.Entities;
using Store.Modules.CloudProduct.Dtos;

namespace Store.Modules.CloudProduct.Repositorys;

public class GoodsViolationRepository(
    [FromKeyedServices("CloudProductConnection")] IFreeSql fsql)
    : BaseRepository<GoodsViolationEntity>(fsql), IScopedDependency
{
    public Task<List<ViolationReasonDto>> GetReasonsAsync() => Orm.Select<ViolationReasonEntity>()
        .OrderBy(x => x.Id).ToListAsync(x => new ViolationReasonDto
        {
            Name = x.Name,
            IsViolation = x.IsViolation
        });

    public Task<List<long>> GetViolationIdsAsync(long[] ids) => Select
        .Where(x => ids.Contains(x.GoodsId)).Distinct().ToListAsync(x => x.GoodsId);

    public async Task<List<long>> GetOffShelfGoodsIdsAsync(long[] ids)
    {
        var records = await Select.Where(x => ids.Contains(x.GoodsId)).ToListAsync();
        return records.GroupBy(x => x.GoodsId).Where(x => x.All(row => row.IsIndexDeleted))
            .Select(x => x.Key).ToList();
    }

    // 解除违规和设置待同步必须一起提交，进程中断后后台索引任务仍可恢复。
    public async Task<int> RemoveAndScheduleRestoreAsync(long[] ids)
    {
        using var unit = Orm.CreateUnitOfWork();
        var violations = unit.GetRepository<GoodsViolationEntity>();
        var goods = unit.GetRepository<GoodsEntity>();
        var removedIds = await violations.Select.Where(x => ids.Contains(x.GoodsId)).Distinct().ToListAsync(x => x.GoodsId);
        await violations.DeleteAsync(x => ids.Contains(x.GoodsId));
        await goods.UpdateDiy.Set(x => x.IsSegmented, (byte)0)
            .Where(x => ids.Contains(x.GoodsId) && x.Status == 0).ExecuteAffrowsAsync();
        unit.Commit();
        return removedIds.Count;
    }

    public Task<List<GoodsEntity>> GetRestorableGoodsAsync(long[] ids) => Orm.Select<GoodsEntity>()
        .Where(x => ids.Contains(x.GoodsId) && x.Status == 0).ToListAsync();

    public Task<int> MarkRestoredAsync(long[] ids) => Orm.Update<GoodsEntity>()
        .Set(x => x.IsSegmented, (byte)1)
        .Where(x => ids.Contains(x.GoodsId) && x.Status == 0).ExecuteAffrowsAsync();

    // 调用方持有 GoodsIndexLock，事务内合并原因，避免并发覆盖。
    public async Task<long[]> MergeAsync(Dictionary<long, string[]> items)
    {
        using var unit = Orm.CreateUnitOfWork();
        var repository = unit.GetRepository<GoodsViolationEntity>();
        var reasonRepository = unit.GetRepository<ViolationReasonEntity>();
        var reasonIds = new Dictionary<string, uint>(StringComparer.Ordinal);
        foreach (var name in items.Values.SelectMany(x => x).Distinct(StringComparer.Ordinal))
        {
            // 让数据库按字典表的排序规则匹配名称，与唯一索引保持一致。
            var reason = await reasonRepository.Select.Where(x => x.Name == name).FirstAsync();
            // 新类型只收录到字典，绝不因首次上报自动启用商品封禁。
            reason ??= await reasonRepository.InsertAsync(new ViolationReasonEntity { Name = name, IsViolation = false });
            // 数据库排序规则可能忽略部分字符差异；判定时仍要求名称完整相等。
            if (reason.IsViolation && string.Equals(reason.Name, name, StringComparison.Ordinal))
                reasonIds.Add(name, reason.Id);
        }
        var ids = items.Keys.ToArray();
        var existing = (await repository.Select.Where(x => ids.Contains(x.GoodsId))
            .ToListAsync()).ToLookup(x => x.GoodsId);
        var now = DateTime.UtcNow;
        var recordedIds = new List<long>();
        foreach (var (goodsId, reasons) in items)
        {
            var accepted = reasons.Where(reasonIds.ContainsKey).Select(x => reasonIds[x]).Distinct().ToArray();
            // 忽略原因仅记录字典，不新增或改变该商品已有的违规状态。
            if (accepted.Length == 0) continue;
            var rows = existing[goodsId].ToArray();
            var previous = rows.Select(x => x.ReasonId).ToHashSet();
            var added = accepted.Where(x => !previous.Contains(x)).ToArray();
            if (added.Length == 0 && rows.All(x => x.IsIndexDeleted)) continue;

            // 下架是商品级操作：新增原因或存在失败记录时，整件商品重新标记待下架。
            foreach (var row in rows)
            {
                row.IsIndexDeleted = false;
                row.UpdatedTime = now;
                await repository.UpdateAsync(row);
            }
            foreach (var reasonId in added)
            {
                await repository.InsertAsync(new GoodsViolationEntity
                {
                    GoodsId = goodsId, ReasonId = reasonId, IsIndexDeleted = false,
                    CreatedTime = now, UpdatedTime = now
                });
            }
            recordedIds.Add(goodsId);
        }
        unit.Commit();
        return recordedIds.ToArray();
    }

    public Task<int> MarkDeletedAsync(long[] ids) => Orm.Update<GoodsViolationEntity>()
        .Set(x => x.IsIndexDeleted, true)
        .Set(x => x.UpdatedTime, DateTime.UtcNow)
        .Where(x => ids.Contains(x.GoodsId)).ExecuteAffrowsAsync();

    public Task<List<long>> GetBatchAsync(long afterId, int size, bool pendingOnly) => Select
        .Where(x => x.GoodsId > afterId)
        .WhereIf(pendingOnly, x => !x.IsIndexDeleted)
        .Distinct().OrderBy(x => x.GoodsId).Limit(size).ToListAsync(x => x.GoodsId);

    public Task<List<long>> GetByReasonAsync(uint reasonId, long afterId, int size) => Select
        .Where(x => x.ReasonId == reasonId)
        .Where(x => x.GoodsId > afterId).OrderBy(x => x.GoodsId)
        .Limit(size).ToListAsync(x => x.GoodsId);
}