using System;
using System.IO;
using System.Text;
using System.Collections.Generic;
using System.Drawing;
using System.Data.SQLite;
using Newtonsoft.Json;
using System.Security.Cryptography;
using System.Windows;

namespace ThyroidDescriptionUI
{
    /// Canvas上绘制的目标有几种类型
    public enum EnumCanvasItemType
    {
        Drawing,
        Choosed,
        Existed,
    }

    /// 线的种类
    public enum EnumCanvasLineType
    {
        Horizontal,
        Vertical,
    }

    /// 病灶信息
    public class LesionInfo
    {
        // 病灶轮廓
        public List<MyPoint> LesionContour { get; set; } = new List<MyPoint>();

        // 回声
        public EchoPatternEnum EchoPattern { get; set; } = 0;

        // 病灶形状
        public ShapeEnum Shape { get; set; } = 0;

        // 边缘
        public MarginEnum Margin { get; set; } = 0;

        // 局灶性强回声
        public EchogenicFociEnum EchogenicFoci { get; set; } = 0;

        // 横径起点
        public MyPoint HorizontalPoint1 { get; set; } = null;

        /// 横径终点
        public MyPoint HorizontalPoint2 { get; set; } = null;

        /// 纵径起点
        public MyPoint VerticalPoint1 { get; set; } = null;

        /// 纵径终点
        public MyPoint VerticalPoint2 { get; set; } = null;

        /// 内容完整
        public bool IsCompleted
        {
            get
            {
                return LesionContour.Count > 0 /*&& ThyroidContour.Count > 0*/ && HorizontalPoint1 != null
                       && HorizontalPoint2 != null && VerticalPoint1 != null && VerticalPoint2 != null;
            }
        }
    }

    /// 病灶描述GT图像信息
    public class GTImgInfo
    {
        public string ImageId { get; set; }

        /// 该图上所有病灶的标准描述
        public List<LesionInfo> Lesions { get; set; }

        /// 甲状腺轮廓
        public List<MyPoint> ThyroidContour { get; set; }

    }

    class DataBase
    {
        #region 数据库相关变量
        private readonly string _dataFolder = System.IO.Path.Combine(System.IO.Path.GetDirectoryName(System.IO.Path.GetDirectoryName(
                                AppDomain.CurrentDomain.BaseDirectory)), "LesionDescriptionGTDatas");
        public readonly string _dbPath;
        public readonly string _imageDataFolder;
        public List<GTImgInfo> _allImages = new List<GTImgInfo>();
        private volatile int _imgIndex = 0;
        public List<LesionInfo> _lesions = new List<LesionInfo>();
        private volatile int _lesionIndex = 0;
        private System.Windows.Point _mouseStartPos;
        // 绘制中的所有轮廓点的集合
        private List<System.Windows.Point> _drawingPoints = new List<System.Windows.Point>();
        private volatile bool _canAutoFinish = false;
        #endregion


        public DataBase(string dbpath, string imgPath)
        {
            _dbPath = dbpath;
            _imageDataFolder = imgPath;
        }

        public DataBase(string dbpath)
        {
            _dbPath = dbpath;
        }

        /// 读入数据库
        public bool ReadDataBase()
        {
            try
            {
                if (!File.Exists(_dbPath))
                {
                    //throw new Exception("未找到存放待标注数据的文件：" + _dbPath);
                    return false;
                }
                SQLiteConnection dbCon = new SQLiteConnection("Data Source=" + _dbPath);
                dbCon.Open();
                SQLiteCommand dbCmd;
                dbCmd = dbCon.CreateCommand();
                dbCmd.CommandText = "select * from GTDatas";
                SQLiteDataReader dbReader;
                dbReader = dbCmd.ExecuteReader();
                if (!dbReader.HasRows)
                {
                    dbReader.Close();
                    dbCmd.Dispose();
                    dbCon.Close();
                    dbCon.Dispose();
                    throw new Exception("待标注的数据为空.");
                    return false;
                }

                while (dbReader.Read())
                {
                    string imgId = ((string)dbReader[0]).TrimEnd();
                    string strLesions = ((string)dbReader[1]).TrimEnd();
                    List<LesionInfo> lesions = JsonConvert.DeserializeObject<List<LesionInfo>>(strLesions);
                    string strThyroidCont = ((string)dbReader[2]).TrimEnd();
                    List<MyPoint> thyroidContour = JsonConvert.DeserializeObject<List<MyPoint>>(strThyroidCont);
                    _allImages.Add(new GTImgInfo { ImageId = imgId, Lesions = lesions, ThyroidContour = thyroidContour });
                }
                dbReader.Close();
                dbCmd.Dispose();

                dbCmd = dbCon.CreateCommand();
                dbCmd.CommandText = "select * from LastModification";
                dbReader = dbCmd.ExecuteReader();
                if (!dbReader.HasRows)
                {
                    _imgIndex = 0;
                }
                else
                {
                    dbReader.Read();
                    string imgId = ((string)dbReader[0]).TrimEnd();
                    int imgIndex = _allImages.FindIndex(x => x.ImageId == imgId);   //最后一个修改的图像索引
                    if (imgIndex == -1)
                    {
                        _imgIndex = 0;
                    }
                    else
                    {
                        _imgIndex = imgIndex;
                    }
                }
                dbReader.Close();
                dbCmd.Dispose();
                dbCon.Close();
                dbCon.Dispose();
                return true;
            }
            catch (Exception excep)
            {
                throw new Exception("读入数据库时出错：" + excep);
            }
        }

        private string ComputeHashCode(byte[] input)
        {
            MD5 md5 = MD5.Create();
            byte[] hash = md5.ComputeHash(input);
            StringBuilder sb = new StringBuilder();
            foreach (var b in hash)
            {
                sb.Append(b.ToString("x2"));
            }
            string hashstr = sb.ToString();
            sb.Clear();
            return hashstr;
        }

        /// 创建数据库
        public void CreateDataBase()
        {
            if (File.Exists(_dbPath))
            {
                throw new Exception("数据库已存在，请检查.");
            }
            // 创建数据库文件
            SQLiteConnection dbCon = new SQLiteConnection("Data Source=" + _dbPath);
            dbCon.Open();
            SQLiteCommand dbCmd;
            dbCmd = dbCon.CreateCommand();
            dbCmd.CommandText = "create table if not exists GTDatas(ImageId varchar(16),Lesions varchar(16),ThyroidContour varchar(16))";
            dbCmd.ExecuteNonQuery();
            dbCmd.Dispose();

            dbCmd = dbCon.CreateCommand();
            dbCmd.CommandText = "create table if not exists LastModification(ImageId varchar(16))";
            dbCmd.ExecuteNonQuery();
            dbCmd.Dispose();

            dbCon.Close();
            dbCon.Dispose();
        }

    }
}