using System;
using System.Collections.Generic;
using System.Text;
using Speech.text;

namespace Speech {
    public class SpeechCache {

        private List<SpeechCacheEntry> _entry = new List<SpeechCacheEntry>();
        private string _tempDir = "./cache/audio";
        private string _useDirectory;

        public SpeechCache() {
            this.Directory = this._tempDir;
        }

        public SpeechCacheEntry[] Entry {
            get {
                return this._entry.ToArray();
            }
            set {
                this._entry = new List<SpeechCacheEntry>(value);
            }
        }

        public string Directory {
            get {
                return this._useDirectory;
            }
            set {
                System.Diagnostics.Debug.WriteLine("Set Cache Directory: '" + value + "'");
                this._tempDir = value;
                System.IO.DirectoryInfo di = new System.IO.DirectoryInfo(value);
                System.Diagnostics.Debug.WriteLine("- Direcotry is: '" + di.FullName + "'");
                if(!di.Exists) {
                    System.Diagnostics.Debug.WriteLine("- Create directory");
                    di.Create();
                }
                this._useDirectory = di.FullName;
            }
        }

        public int Count {
            get => this._entry.Count;
        }

        public void Clear() {
            foreach(SpeechCacheEntry entry in _entry)
                if(System.IO.File.Exists(entry.File) && entry.File != "")
                    System.IO.File.Delete(entry.File);
            this._entry.Clear();
        }

        public SpeechCacheEntry find(string text) {
            text = text.ToLower().Trim();
            foreach (SpeechCacheEntry sce in this._entry)
                if (sce.Text == text)
                    return sce;
            return null;
        }

        public SpeechCacheEntry find(string text, eMood mood) {
            text = text.ToLower().Trim();
            foreach (SpeechCacheEntry sce in this._entry)
                if (sce.Text == text && (mood & sce.Mood)>0)
                    return sce;
            return null;
        }

        /// <summary>
        /// Säubert die Cache Einträge.
        /// - Einträge, deren Datei nicht existiet, werden entfernt
        /// - Invalide Einträge werden entfernt
        /// - Entfernt doppelte Einträge
        /// </summary>
        private void Clean() {
            foreach (SpeechCacheEntry entry in _entry) {
                bool bRemove = false;
                if (
                    !System.IO.File.Exists(entry.File) ||
                    entry.File == "" ||
                    entry.Text == ""
                )
                    bRemove = true;

                // TODO
                
                if(bRemove) {
                    if (System.IO.File.Exists(entry.File) && entry.File!="")
                        System.IO.File.Delete(entry.File);
                    this._entry.Remove(entry);
                }
            }
        }

        public SpeechCacheEntry Add(string text) {
            SpeechCacheEntry sce = this.find(text);
            if (sce == null) {
                sce = new SpeechCacheEntry();
                sce.Text = text.ToLower().Trim();
                sce.Mood = eMood.All;
                sce.Time = DateTime.Now;
                sce.LastAccess = DateTime.Now;
                sce.File = this._useDirectory + "/" + this.generateFileName("wav");
                this._entry.Add(sce);
            }
            return sce;
        }

        public SpeechCacheEntry Add(string text, eMood Mood) {
            SpeechCacheEntry sce = this.find(text);
            if (sce == null) {
                sce = new SpeechCacheEntry();
                sce.Text = text.ToLower().Trim();
                sce.Mood = Mood;
                sce.Time = DateTime.Now;
                sce.LastAccess = DateTime.Now;
                sce.File = this._useDirectory + "/" + this.generateFileName("wav");
                this._entry.Add(sce);

            }
            return sce;
        }

        public bool Load(string FileName) {
            if (System.IO.File.Exists(FileName) && FileName != "") {
                System.Diagnostics.Debug.WriteLine("Load('"+FileName+"')");
                //this._entry = System.Fire.Serialize.Serializer.DeserializeArray<List<SpeechCacheEntry>>(FileName, System.Fire.Serialize.Property.ArraySize.bits_16, System.Fire.Serialize.Property.StringEncoding.UTF8);
                //SpeechCacheEntry[] itms = System.Fire.Serialize.Serializer.DeserializeArray<SpeechCacheEntry[]>(FileName, System.Fire.Serialize.Property.ArraySize.bits_16, System.Fire.Serialize.Property.StringEncoding.UTF8);
                SpeechCacheEntry[] itms = System.Fire.Serialize.Serializer.DeserializeObject<SpeechCacheEntry[]>(FileName, System.Fire.Serialize.Property.ArraySize.bits_16, System.Fire.Serialize.Property.StringEncoding.UTF8);
                this._entry = new List<SpeechCacheEntry>(itms);
                //this.Clean();
                return true;
            }
            return false;
        }

        public bool Save(string FileName) {
            //if (!System.IO.File.Exists(FileName) && FileName != "") {
                //this.Clean();
                System.Fire.Serialize.Serializer.SerializeArray(FileName, this._entry.ToArray(), System.Fire.Serialize.Property.ArraySize.bits_16, System.Fire.Serialize.Property.StringEncoding.UTF8);
                return true;
            //}
            //return false;
        }


        /// <summary>
        /// Generates an unique file name
        /// </summary>
        /// <returns></returns>
        public string generateFileName() {
            return generateFileName(".tmp");
        }

        public string generateFileName(string file_extention) {
            string cr = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
            Random rnd = new Random();
            return this.DateTimeToCrypt() + "_" + cr.Substring(rnd.Next(0,cr.Length-1),1) + cr.Substring(rnd.Next(0, cr.Length - 1),1) + cr.Substring(rnd.Next(0, cr.Length - 1),1) + cr.Substring(rnd.Next(0, cr.Length - 1),1) + "_" + rnd.Next(0, 999999).ToString().PadLeft(6, '0') + "."+file_extention;
        }


        protected string DateTimeToCrypt() {
            return this.DateTimeToCrypt(DateTime.Now);
        }

        protected string DateTimeToCrypt(DateTime dt) {
            string cr = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
            int y = dt.Year;
            int M = dt.Month;
            int d = dt.Day;
            int h = dt.Hour;
            int i = dt.Minute;
            int s = dt.Second;
            int f = dt.Millisecond;
            int y1 = (int)Math.Floor((decimal)(y / cr.Length));
            int y2 = y - (y1 * cr.Length);
            int sum1 = (M * d) % ( cr.Length - 1);
            int sum2 = (h * i * s) % (cr.Length - 1);
            return cr.Substring(y1, 1) + cr.Substring(y2, 1) +
                cr.Substring(M, 1) +
                cr.Substring(d, 1) +
                cr.Substring(h, 1) +
                cr.Substring(i, 1) +
                cr.Substring(s, 1) +
                cr.Substring(f % (cr.Length - 1), 1) + 
                cr.Substring(sum1, 1) +
                cr.Substring(sum2, 1)
            ;
        }

    }
}