using System.Reflection;
using MasstransferInfrastructure.Database.DTO;
using Masuit.Tools;
using Masuit.Tools.Systems;
using SQLite;

namespace MasstransferInfrastructure.Database.Sqlite;

/// <summary>
///     SQLite 数据库ORM工具类
/// </summary>
public class SqliteHelper
{
    // 默认的数据库密码
    private const string Password = "88888888";
    private readonly SQLiteConnection _db;

    private static SqliteHelper? _instance;

    private static readonly object Locker = new();

    private SqliteHelper()
    {
        var profile = Environment.GetEnvironmentVariable("USERPROFILE");
        var path = Path.Combine(profile, "masstransfer", "mass-transfer.db");

        if (!Directory.Exists(Path.GetDirectoryName(path)!))
        {
            Directory.CreateDirectory(Path.GetDirectoryName(path)!);

            // 将文件复模板数据库复制到目标目录下
            var template = Path.Combine(Environment.CurrentDirectory, "mass-transfer.db");
            File.Copy(template, path);
        }


        _db = new SQLiteConnection(path);
        _db.Execute($"PRAGMA key = '{Password}'");
    }

    public static SqliteHelper GetInstance()
    {
        lock (Locker)
        {
            // 如果类的实例不存在则创建，否则直接返回
            _instance ??= new SqliteHelper();
        }

        return _instance;
    }


    /// <summary>
    ///     插入数据
    /// </summary>
    /// <param name="item">待插入的数据</param>
    /// <typeparam name="T">数据类型</typeparam>
    public int Insert<T>(T item)
    {
        CreateTable(item!.GetType());

        var id = item?.GetType().GetProperty("Id");
        if (id != null && id.CanWrite) id.SetValue(item, SnowFlakeNew.LongId.ToString());

        var createTime = item?.GetType().GetProperty("CreateTime");
        if (createTime != null && createTime.CanWrite) createTime.SetValue(item, DateTime.Now);


        return _db.Insert(item);
    }

    /// <summary>
    ///     更新数据
    /// </summary>
    /// <param name="item">待更新的数据</param>
    /// <typeparam name="T">数据类型</typeparam>
    public int Update<T>(T item)
    {
        var updateTime = item?.GetType().GetProperty("UpdateTime");
        if (updateTime != null && updateTime.CanWrite) updateTime.SetValue(item, DateTime.Now);

        return _db.Update(item);
    }

    /// <summary>
    ///     删除数据
    /// </summary>
    /// <param name="id">待删除数据的ID</param>
    /// <typeparam name="T">数据类型</typeparam>
    public int DeleteById<T>(object id) where T : new()
    {
        var type = typeof(T);
        var tableName = type.GetCustomAttribute<TableAttribute>()!.Name ?? type.Name;

        return _db.Execute($"delete from {tableName} where id = {id}");
    }

    /// <summary>
    ///     删除数据
    /// </summary>
    /// <param name="item">待删除数据的对象</param>
    /// <typeparam name="T">数据类型</typeparam>
    public int Delete<T>(T item)
    {
        return _db.Delete<T>(item);
    }

    /// <summary>
    ///     根据ID获取数据
    /// </summary>
    /// <param name="id">数据ID</param>
    /// <typeparam name="T">数据类型</typeparam>
    public T GetById<T>(object id) where T : new()
    {
        return _db.Get<T>(id);
    }

    /// <summary>
    ///     查询数据
    /// </summary>
    /// <param name="sql">查询语句</param>
    /// <param name="args">查询参数</param>
    /// <typeparam name="T">数据类型</typeparam>
    public List<T> Query<T>(string sql, params object[] args) where T : new()
    {
        return _db.Query<T>(sql, args);
    }

    /// <summary>
    ///     查询所有数据
    /// </summary>
    /// <typeparam name="T">数据类型</typeparam>
    public List<T> ListAll<T>() where T : new()
    {
        return _db.Table<T>().ToList();
    }

    public T SaveOrUpdate<T>(T item) where T : new()
    {
        var id = item?.GetType().GetProperty("Id");
        if (id != null && id.GetValue(item).IsNullOrEmpty())
            // 插入
            Insert(item);
        else
            // 否则是更新操作
            Update(item);

        return item;
    }

    /// <summary>
    ///     执行SQL语句
    /// </summary>
    /// <param name="sql">SQL语句</param>
    public int Execute(string sql)
    {
        return _db.Execute(sql);
    }

    /// <summary>
    ///     获取当前的表信息
    /// </summary>
    /// <param name="tableName"></param>
    /// <returns></returns>
    public List<SQLiteConnection.ColumnInfo> GetTableInfo(string tableName)
    {
        return _db.GetTableInfo(tableName);
    }

    /// <summary>
    ///     创建表
    /// </summary>
    /// <param name="entity"></param>
    public void CreateTable(Type entity)
    {
        _db.CreateTable(entity);
    }

    /// <summary>
    /// 分页查询结果
    /// </summary>
    /// <param name="page"></param>
    /// <param name="pageSize"></param>
    /// <param name="sql"></param>
    /// <param name="args"></param>
    /// <typeparam name="T"></typeparam>
    /// <returns></returns>
    public Page<T> Page<T>(int page, int pageSize, string sql, params object[] args) where T : new()
    {
        var countSql = "select count(*) from ( " + sql + " ) as c";
        var total = _db.ExecuteScalar<int>(countSql, args);
        var data = Query<T>(sql + " limit " + (page - 1) * pageSize + "," + pageSize, args);
        return new Page<T>
        {
            CurrentPage = page,
            PageSize = pageSize,
            Total = total,
            Pages = total / pageSize + (total % pageSize == 0 ? 0 : 1),
            Data = data
        };
    }

    /// <summary>
    /// 批量插入
    /// </summary>
    /// <param name="objects"></param>
    /// <param name="runInTransaction"></param>
    /// <typeparam name="T"></typeparam>
    public void BatchInsert<T>(IEnumerable<T> objects, bool runInTransaction = false) where T : new()
    {
        if (runInTransaction)
        {
            _db.RunInTransaction((Action)(() =>
            {
                foreach (object obj in objects)
                    Insert(obj);
            }));
        }
        else
        {
            foreach (object obj in objects)
                Insert(obj);
        }
    }


    /// <summary>
    /// 更新指定字段
    /// </summary>
    /// <param name="id"></param>
    /// <param name="field"></param>
    /// <param name="value"></param>
    /// <typeparam name="T"></typeparam>
    public void UpdateFieldById<T>(object? id, string field, object? value) where T : new()
    {
        var type = typeof(T);
        var tableName = type.GetCustomAttribute<TableAttribute>()!.Name ?? type.Name;

        var sql = $"update {tableName} set {field} = ? where id = ?";

        _db.Execute(sql, value, id);
    }
}