using System.Collections.Concurrent;
using System.Security.Cryptography.Xml;
using JNPF;
using JNPF.Common.Core.Manager;
using JNPF.Common.Extension;
using JNPF.DependencyInjection;
using Microsoft.Extensions.Configuration;
using SqlSugar;
using Tnb.Core;
using Tnb.Vengine.Domain;

namespace Tnb.Vengine.DataAccess;

/// <summary>
///
/// </summary>
public class DataAccess : IDataAccess, ITransient, IDisposable
{
    private const int MAX_PAGE_SIZE = 1000;
    private static ISqlSugarClient? _db;

    protected ISqlSugarClient Db
    {
        get
        {
            if (_db == null)
            {
                ConnectionStringsOptions conn = App.GetConfig<ConnectionStringsOptions>("ConnectionStrings", true);
                //var dbType = App.Configuration.GetConnectionString("DbType");
                //var dbConn = App.Configuration.GetConnectionString("DbConn");
                _db = SugarHelper.CreateSugarClient(conn.ConfigId, conn.DBType, conn.ConnectString);
            }
            return _db;
        }
    }

    private readonly IUserManager _user;

    /// <summary>
    /// 全局缓存
    /// </summary>
    private static ConcurrentDictionary<string, ISqlSugarClient> DbCache = new ConcurrentDictionary<string, ISqlSugarClient>();

    /// <summary>
    /// 构造
    /// </summary>
    public DataAccess(IUserManager currentUser)
    {
        _user = currentUser;
    }

    /// <summary>
    /// 释放
    /// </summary>
    public void Dispose()
    {
        foreach (var item in DbCache)
        {
            item.Value.Dispose();
        }
        DbCache.Clear();
    }

    /// <summary>
    /// 获取 ISqlSugarClient
    /// </summary>
    public ISqlSugarClient GetSqlSugar(string? dbCode = null)
    {
        if (string.IsNullOrEmpty(dbCode) || dbCode == DbConsts.DefaultDbCode)
        {
            return Db;
        }
        if (DbCache.ContainsKey(dbCode))
        {
            return DbCache[dbCode];
        }

        var dblink = GetVmodelLink(dbCode);
        ThrowIf.IsNull(dblink, $"没有此数据库{dbCode}连接信息");
        var sugar = SugarHelper.CreateSugarClient(dblink.dbCode, dblink.dbType, dblink.dbConnection);
        if (sugar.Ado.IsValidConnection())
        {
            DbCache[dbCode] = sugar;
        }
        else
        {
            sugar.Dispose();
            throw new Exception($"无法连接到数据库{dbCode}");
        }
        return DbCache[dbCode];
    }

    /// <summary>
    /// 获取 DbLink
    /// </summary>
    public VmodelLink GetVmodelLink(string dbCode)
    {
        var model = Db.Queryable<VmodelLink>().First(a => a.dbCode == dbCode);
        return model;
    }

    /// <summary>
    /// 获取 Vmodel, 为空时不抛异常
    /// </summary>
    public async Task<Vmodel?> TryGetVmodelAsync(string id, bool loadNavigate = false)
    {
        Vmodel vm = await Db.Queryable<Vmodel>().FirstAsync(a => a.id == id && a.deleted == 0);
        if (vm != null && loadNavigate)
        {
            await LoadVmodelNavigateAsync(vm);
        }
        return vm;
    }

    /// <summary>
    /// 获取 Vmodel, 为空时抛异常
    /// </summary>
    public async Task<Vmodel> GetVmodelAsync(string id, bool loadNavigate = false)
    {
        Vmodel vm = await Db.Queryable<Vmodel>().FirstAsync(a => a.id == id && a.deleted == 0);
        ThrowIf.IsNull(vm, $"找不到id={id}的模型");
        if (loadNavigate)
        {
            await LoadVmodelNavigateAsync(vm);
        }
        return vm;
    }

    /// <summary>
    /// 获取 Vmodel, 为空时不抛异常
    /// </summary>
    public async Task<Vmodel?> TryGetVmodelAsync(string areaCode, string vmCode, bool loadNavigate = false)
    {
        Vmodel vm = await Db.Queryable<Vmodel>().FirstAsync(a => a.areaCode == areaCode && a.vmCode == vmCode && a.deleted == 0);
        if (vm != null && loadNavigate)
        {
            await LoadVmodelNavigateAsync(vm);
        }

        return vm;
    }

    /// <summary>
    /// 获取 Vmodel, 为空时抛异常
    /// </summary>
    public async Task<Vmodel> GetVmodelAsync(string areaCode, string vmCode, bool loadNavigate = false)
    {
        Vmodel vm = await Db.Queryable<Vmodel>().FirstAsync(a => a.areaCode == areaCode && a.vmCode == vmCode && a.deleted == 0);
        ThrowIf.IsNull(vm, $"找不到areaCode={areaCode}, vmCode={vmCode}的模型");
        if (loadNavigate)
        {
            await LoadVmodelNavigateAsync(vm);
        }

        return vm;
    }

    ///// <summary>
    ///// 获取 Vmodel
    ///// </summary>
    //public async Task<Vmodel?> GetVmodelAsync(string tableName, string? dbCode)
    //{
    //    Vmodel vm = await _db.Queryable<Vmodel>().FirstAsync(a => a.tableName == tableName && a.dbCode == dbCode && a.deleted == 0);
    //    return vm;
    //}

    /// <summary>
    /// 加载模型的导航属性
    /// </summary>
    /// <param name="vm"></param>
    /// <returns></returns>
    private async Task LoadVmodelNavigateAsync(Vmodel vm)
    {
        Dictionary<string, Vmodel> dictVm = new();
        var vmids = vm.navProps.Select(a => a.vmid).Distinct().ToList();
        var ls = await Db.Queryable<Vmodel>().Where(a => vmids.Contains(a.id)).ToListAsync();
        var navs = ls.ToDictionary(a => a.id);
        foreach (var navProp in vm.navProps)
        {
            navProp.naviModel = (Vmodel)navs.GetOrDefault(navProp.vmid);
            //if (!dictVm.ContainsKey(navProp.vmid))
            //{
            //    var navModel = await GetVmodelAsync(navProp.vmid);
            //    dictVm.Add(navProp.vmid, navModel);
            //}
            //navProp.naviModel = dictVm[navProp.vmid];
        }
    }

    /// <summary>
    /// 查询数据 默认方法
    /// </summary>
    public async Task<VmPagedOutput> QueryDataAsync(Vmodel vm, VmListInput input)
    {
        ISqlSugarClient db = GetSqlSugar(vm.dbCode);
        var query = db.Queryable<object>().AS(vm.tableName, VmSelectProp.MAIN_ALIES);
        var selProps = vm.GetVmSelectProps(input.o);
        //处理导航属性联表
        List<JoinInfoParameter> joins = vm.GetJoinInfos(selProps);
        //if (joins.Count > 0)
        query.AddJoinInfo(joins);
        List<IConditionalModel> wheres = vm.GetConditionalModels(input.q);
        if (!string.IsNullOrEmpty(input.k))
        {
            var lsCondition = new List<KeyValuePair<WhereType, ConditionalModel>>();
            var wType = WhereType.And;
            foreach (var prop in vm.dbProps.Where(a => a.fuzzy))
            {
                lsCondition.Add(new(wType, new ConditionalModel() { FieldName = prop.field, ConditionalType = ConditionalType.Like, FieldValue = input.k, CSharpTypeName = prop.csType }));
                wType = WhereType.Or;
            }
            wheres.Add(new ConditionalCollections() { ConditionalList = lsCondition });
        }
        //处理查询参数
        //if (wheres.Count > 0)
        query.Where(wheres);
        if (!string.IsNullOrEmpty(input.sort))
        {
            query.OrderBy(input.sort);
        }
        //处理输出字段
        List<SelectModel> selects = vm.GetSelectModels(selProps);
        query.Select(selects);
        //查询数据
        VmPagedOutput result = new();
        List<Dictionary<string, object>> ls = new();
        int skip = input.pnum > 0 ? (input.pnum - 1) * input.psize : 0;
        int take = input.psize == 0 ? MAX_PAGE_SIZE : input.psize;
        if (input.pnum > 0) { result.total = await query.CountAsync(); }
        ls = await query.Skip(skip).Take(take).ToDictionaryListAsync();
        //组装输出对象
        foreach (var data in ls)
        {
            DObject ret = await CombineOutputAsync(vm, new DObject(data), selProps);
            result.items.Add(ret);
        }

        return result;
    }

    /// <summary>
    /// 组装子模型对象
    /// </summary>
    /// <param name="vm"></param>
    /// <param name="src"></param>
    /// <param name="selProps"></param>
    /// <returns></returns>
    private async Task<DObject> CombineOutputAsync(Vmodel vm, DObject src, List<VmSelectProp> selProps)
    {
        DObject ret = new();
        foreach (var prop in selProps)
        {
            // 加载主表字段
            if (prop.navType == eNavigateType.None || prop.navCode == VmSelectProp.MAIN_ALIES)
            {
                if (src.ContainsKey(prop.code))
                {
                    ret.Add(prop.code, src[prop.code]);
                }
            }
            else
            {
                // 加载关联表字段
                if (prop.navType == eNavigateType.OneToOne)
                {
                    NestedOutput(vm, src, ret, prop);
                }
                else if (prop.navType == eNavigateType.OneToMany)
                {
                    await NestedOneToManyAsync(vm, src, ret, prop, selProps);
                }
                else if (prop.navType == eNavigateType.ManyToMany)
                {
                    if (!ret.ContainsKey(prop.navCode))
                    {
                        ret.Add(prop.navCode, new List<DObject>());
                    }
                }
            }
        }
        return ret;
    }

    /// <summary>
    /// 将一对一的关联表字段嵌入到返回值中
    /// </summary>
    private void NestedOutput(Vmodel vm, DObject src, DObject ret, VmSelectProp prop)
    {
        // 以 nav_prop的形式返回
        var key = prop.navCode + "_" + prop.code;
        ret.Add(key, src[key]);
        // 以 nav.prop的形式返回
        //if (!ret.ContainsKey(prop.navCode))
        //{
        //    ret.Add(prop.navCode, new DObject());
        //}
        //var key = prop.navCode + "_" + prop.code;
        //if (src.ContainsKey(key))
        //{
        //    ((DObject)ret[prop.navCode]).Add(prop.code, src[key]);
        //}
    }

    private async Task NestedOneToManyAsync(Vmodel vm, DObject src, DObject ret, VmSelectProp prop, List<VmSelectProp> selProps)
    {
        // 在返回值中增加导航属性
        if (ret.ContainsKey(prop.navCode))
        {
            return;
        }
        ret.Add(prop.navCode, new List<DObject>());

        // 找到导航属性的配置
        var navCfg = vm.navProps.First(a => a.code == prop.navCode);
        if (navCfg != null && navCfg.naviModel != null && src.ContainsKey(navCfg.refField) && navCfg.refCode == VmSelectProp.MAIN_ALIES)
        {
            VmListInput input = new VmListInput();
            var fkProp = navCfg.naviModel.FieldCodeToPropCode(navCfg.fkField);
            if (!string.IsNullOrEmpty(fkProp))
            {
                input.q = new DObject(fkProp, src[navCfg.refField]);
                input.o = string.Join(',', selProps.Where(a => a.navCode == prop.navCode).Select(a => a.code));
                ret[prop.navCode] = (await QueryDataAsync(navCfg.naviModel, input)).items;
            }
        }
    }

    /// <summary>
    /// 新增数据 默认方法
    /// </summary>
    public async Task<dynamic> CreateDataAsync(Vmodel vm, VmCreateInput input)
    {
        ISqlSugarClient db = GetSqlSugar(vm.dbCode);
        ThrowIf.When(input.data == null && input.items == null, "新增数据时，data和items不可同时为空");
        //新增一条数据
        if (input.data != null)
        {
            var pkey = vm.GetPrimary();
            var model = vm.ToCreateEntity(input.data, _user);
            if (pkey.csType == "int" || pkey.csType == "long")
            {
                var id = await db.Insertable(model).AS(vm.tableName).ExecuteReturnBigIdentityAsync();
                if ((long)input.data[pkey.code] != id) input.data[pkey.code] = id;
            }
            else
            {
                await db.Insertable(model).AS(vm.tableName).ExecuteCommandAsync();
            }
            return input.data;
        }
        //批量新增数据
        else
        {
            var pkey = vm.GetPrimary();
            List<DObject> lst = new List<DObject>();
            foreach (var item in input.items!)
            {
                lst.Add(vm.ToCreateEntity(item, _user));
            }
            if (pkey.csType == "int")
            {
                var ids = await db.Insertable(lst).AS(vm.tableName).ExecuteReturnPkListAsync<int>();
                for (int i = 0; i < input.items.Count; i++)
                {
                    input.items[i][pkey.code] = ids[i];
                }
            }
            else if (pkey.csType == "long")
            {
                var ids = await db.Insertable(lst).AS(vm.tableName).ExecuteReturnPkListAsync<long>();
                for (int i = 0; i < input.items.Count; i++)
                {
                    input.items[i][pkey.code] = ids[i];
                }
            }
            else
            {
                await db.Insertable(lst).AS(vm.tableName).ExecuteCommandAsync();
            }
            return input.items;
        }
        //else
        //{
        //    input.data = vm.GetDefaultDObject();
        //    var model = vm.PropToField(input.data);
        //    num = await db.Insertable(model).AS(vm.tableName).ExecuteCommandAsync();
        //    return input.data;
        //}
    }

    /// <summary>
    /// 更新数据 默认方法
    /// </summary>
    public async Task<dynamic> UpdateDataAsync(Vmodel vm, VmUpdateInput input)
    {
        ISqlSugarClient db = GetSqlSugar(vm.dbCode);
        var pk = vm.GetPrimary();
        int num = 0;
        //修改一条数据
        if (input.data != null)
        {
            var model = vm.ToUpdateEntity(input.data, _user);
            if (!model.ContainsKey(pk.field))
            {
                throw new Exception($"更新数据时主键({pk.code})不可为空");
            }
            //if (!model.ContainsKey(pk.field) && input.id != null)
            //{
            //    model.Add(pk.field, input.id);
            //}
            num = await db.Updateable(model).AS(vm.tableName).WhereColumns(pk.field).ExecuteCommandAsync();
        }
        //批量修改数据
        else if (input.items != null)
        {
            List<DObject> lst = new();
            foreach (var item in input.items)
            {
                var model = vm.ToUpdateEntity(item, _user);
                if (model.ContainsKey(pk.field))
                {
                    lst.Add(model);
                }
            }
            num = await db.Updateable(lst).AS(vm.tableName).WhereColumns(pk.field).ExecuteCommandAsync();
        }
        return num;
    }

    /// <summary>
    /// 删除数据 默认方法
    /// </summary>
    public async Task<int> DeleteDataAsync(Vmodel vm, VmDeleteInput input)
    {
        ISqlSugarClient db = GetSqlSugar(vm.dbCode);
        var pk = vm.GetPrimary();
        int num = 0;
        List<Dictionary<string, object>> ids = new();
        if (input.id != null)
        {
            ids.Add(new DObject(pk.field, input.id));
        }
        else if (input.ids != null)
        {
            ids.AddRange(input.ids.Select(a => new DObject(pk.field, a)));
        }
        if (ids.Count > 0)
        {
            num = await db.Deleteable<object>().AS(vm.tableName).WhereColumns(ids).ExecuteCommandAsync();
        }

        return num;
    }
}