using System;
using System.Collections.Generic;
using System.Data.SQLite;
using System.Linq;
using System.Text;

namespace IOTContainer.SQLite
{
    public class SQLiteAdapter : IDisposable
    {
        #region 构造函数
        /// <summary>
        /// 初始化适配器
        /// </summary>
        /// <param name="databasePath">数据库文件路径</param>
        /// <param name="isReadOnly">是否只读</param>
        public SQLiteAdapter(string databasePath, bool isReadOnly = false)
        {
            if (string.IsNullOrWhiteSpace(databasePath))
            {
                throw new Exception("Database File Cannot be Null Or White Space!");
            }

            this.DatabasePath = databasePath;
            this.IsReadOnly = isReadOnly;
            this._password = null;
            this._connection = null;
        }

        /// <summary>
        /// 初始化适配器
        /// </summary>
        /// <param name="databasePath">数据库文件路径</param>
        /// <param name="password">数据库密码</param>
        /// <param name="isReadOnly">是否只读</param>
        public SQLiteAdapter(string databasePath, string password, bool isReadOnly = false)
        {
            if (string.IsNullOrWhiteSpace(databasePath))
            {
                throw new Exception("Database File Cannot be Null Or White Space!");
            }

            this.DatabasePath = databasePath;
            this._password = password;
            this.IsReadOnly = isReadOnly;
            this._connection = null;
        }
        #endregion

        #region 字段属性
        /// <summary>
        /// 密码
        /// </summary>
        private string _password;

        /// <summary>
        /// 数据库文件
        /// </summary>
        public string DatabasePath { get; private set; }

        /// <summary>
        /// 是否只读
        /// </summary>
        public bool IsReadOnly { get; }

        private string DataSource
        {
            get
            {
                StringBuilder builder = new StringBuilder();
                builder.Append(string.Format("Data Source={0}", this.DatabasePath));

                if (!string.IsNullOrEmpty(_password))
                {
                    builder.Append(string.Format(";Password={0}", this._password));
                }

                if (IsReadOnly)
                {
                    builder.Append(string.Format(";Read Only={0}", this.IsReadOnly));
                }

                return builder.ToString();
            }
        }

        /// <summary>
        /// 连接
        /// </summary>
        private SQLiteConnection _connection;

        /// <summary>
        /// 获取是否连接
        /// </summary>
        public bool IsConnect { get; private set; }

        /// <summary>
        /// 获取是否销毁
        /// </summary>
        public bool IsDispose { get; private set; }
        #endregion

        #region 对外函数
        /// <summary>
        /// 连接数据库
        /// </summary>
        public void Connection()
        {
            try
            {
                if (IsDispose)
                {
                    throw new Exception("Adapter Is Dispose!");
                }

                if (this.IsConnect)
                {
                    throw new Exception("Adapter Is Aready Connect!");
                }

                this._connection = new SQLiteConnection(this.DataSource);
                this._connection.Open();
                this.IsConnect = true;
            }
            catch (Exception e)
            {
                throw e;
            }
           
        }

        /// <summary>
        /// 获取执行器
        /// </summary>
        /// <returns>执行器</returns>
        public SQLiteActuator GetActuator()
        {

            if (IsDispose)
            {
                throw new Exception("Adapter Is Dispose!");
            }

            if (!this.IsConnect)
            {
                throw new Exception("Adapter Is Not Connect!");
            }

            return new SQLiteActuator(new SQLiteCommand(this._connection));
        }

        /// <summary>
        /// 关闭连接
        /// </summary>
        public void Close()
        {
            if (!this.IsConnect)
            {
                throw new Exception("Adapter Is Not Connect!");
            }

            this.IsConnect = false;
            this._connection.Close();
            this._connection.Dispose();
            this._connection = null;
        }

        /// <summary>
        /// 销毁
        /// </summary>
        public void Dispose()
        {
            this.IsDispose = true;

            if (this.IsConnect)
            {
                this.Close();
            }

            this._password = null;
            this.DatabasePath = null;
        }
        #endregion
    }
}