using System;
using System.Linq;
using System.Threading.Tasks;
using System.IO;
using Newtonsoft.Json;
using FreeSql;
using FreeSql.DataAnnotations;
using ZhonTai.Common.Helpers;
using ZhonTai.Admin.Core.Configs;

namespace ZhonTai.Admin.Core.Db
{
    public abstract class SyncData
    {
        /// <summary>
        /// 检查实体属性是否为自增长
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        private bool CheckIdentity<T>() where T : class
        {
            var isIdentity = false;
            var properties = typeof(T).GetProperties();
            foreach (var property in properties)
            {
                if (property.GetCustomAttributes(typeof(ColumnAttribute), false).FirstOrDefault() is ColumnAttribute columnAttribute && columnAttribute.IsIdentity)
                {
                    isIdentity = true;
                    break;
                }
            }

            return isIdentity;
        }

        /// <summary>
        /// 初始化数据表数据
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="db"></param>
        /// <param name="unitOfWork"></param>
        /// <param name="tran"></param>
        /// <param name="data"></param>
        /// <param name="dbConfig"></param>
        /// <returns></returns>
        protected virtual async Task InitDataAsync<T>(
            IFreeSql db,
            IUnitOfWork unitOfWork,
            System.Data.Common.DbTransaction tran,
            T[] data,
            DbConfig dbConfig = null
        ) where T : class, new()
        {
            var table = typeof(T).GetCustomAttributes(typeof(TableAttribute), false).FirstOrDefault() as TableAttribute;
            var tableName = table.Name;

            try
            {
                if (await db.Queryable<T>().AnyAsync())
                {
                    Console.WriteLine($" table: {tableName} record already exists");
                    return;
                }

                if (!(data?.Length > 0))
                {
                    Console.WriteLine($" table: {tableName} import data []");
                    return;
                }

                var repo = db.GetRepository<T>();
                var insert = db.Insert<T>();
                if (unitOfWork != null)
                {
                    repo.UnitOfWork = unitOfWork;
                    insert = insert.WithTransaction(tran);
                }

                var isIdentity = CheckIdentity<T>();
                if (isIdentity)
                {
                    if (dbConfig.Type == DataType.SqlServer)
                    {
                        var insrtSql = insert.AppendData(data).InsertIdentity().ToSql();
                        await repo.Orm.Ado.ExecuteNonQueryAsync($"SET IDENTITY_INSERT {tableName} ON\n {insrtSql} \nSET IDENTITY_INSERT {tableName} OFF");
                    }
                    else
                    {
                        await insert.AppendData(data).InsertIdentity().ExecuteAffrowsAsync();
                    }
                }
                else
                {
                    repo.DbContextOptions.EnableCascadeSave = true;
                    await repo.InsertAsync(data);
                }

                Console.WriteLine($" table: {tableName} sync data succeed");
            }
            catch (Exception ex)
            {
                Console.WriteLine($" table: {tableName} sync data failed.\n{ex.Message}");
                throw;
            }
        }

        protected virtual T[] GetData<T>(bool isTenant = false, string path = "InitData/Admin")
        {
            var table = typeof(T).GetCustomAttributes(typeof(TableAttribute), false).FirstOrDefault() as TableAttribute;
            var fileName = $"{table.Name}{(isTenant ? ".tenant" : "")}.json";
            var filePath = Path.Combine(AppContext.BaseDirectory, $"{path}/{fileName}").ToPath();
            if (!File.Exists(filePath))
            {
                var msg = $"文件{filePath}不存在";
                Console.WriteLine(msg);
                throw new Exception(msg);
            }
            var jsonData = FileHelper.ReadFile(filePath);
            var data = JsonConvert.DeserializeObject<T[]>(jsonData);

            return data;
        }
    }
}