using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;

namespace Otter {
    /// <summary>
    /// Class that is used for storing strings, ints, floats, or bools with keys of enum or string.  The
    /// saver can output data in an semi-encrypted format, and also an editable config file format.
    /// </summary>
    public class DataSaver {

        /// <summary>
        /// The string to use when delimiting key data in data exports.
        /// </summary>
        public string KeyDelim = "::OTTERK::";

        /// <summary>
        /// The string to use when delimiting value data in data exports.
        /// </summary>
        public string ValueDelim = "::OTTERV::";

        /// <summary>
        /// The phrase to use as a salt when encrypting the data exports.
        /// </summary>
        public string EncryptionSalt = "otter";

        /// <summary>
        /// The guide to salt the data string.  {S} is the salt, {D} is the data.
        /// It is recommended to change this from the default for your game, but
        /// only if you really care about hacking save data.
        /// </summary>
        public string SaltGuide = "{S}{D}{S}";

        /// <summary>
        /// The default path that the files will be imported from and exported to.
        /// </summary>
        public string DefaultPath = "";

        /// <summary>
        /// The default file name that the data will export as.
        /// </summary>
        public string DefaultFilename = "data";

        /// <summary>
        /// The export mode for the data.
        /// Data: Semi-encrypted uneditable data.
        /// Config: Easy to hand edit unencrypted data.
        /// </summary>
        public DataExportMode ExportMode = DataExportMode.Data;

        /// <summary>
        /// The export modes for the data.
        /// </summary>
        public enum DataExportMode {
            Data,
            Config
        }

        Dictionary<string, string> data = new Dictionary<string, string>();

        /// <summary>
        /// Initializes a new instance of the DataSaver class.
        /// </summary>
        /// <param name="defaultPath">The default path.</param>
        public DataSaver(string defaultPath = "") {
            DefaultPath = defaultPath;
        }

        /// <summary>
        /// Verifies the specified string data.  Only applies to DataExportMode.Data.
        /// </summary>
        /// <param name="stringData">The string data.</param>
        /// <returns>True if the data is successfully verified.</returns>
        public bool Verify(string stringData) {
            string[] split = Regex.Split(stringData, ":");

            if (split.Length != 2) return false;

            string dataToHash = SaltGuide;
            dataToHash = dataToHash.Replace("{S}", EncryptionSalt);
            dataToHash = dataToHash.Replace("{D}", split[1]);

            string hash = Util.MD5Hash(dataToHash);

            if (hash == split[0]) return true;

            return false;
        }

        /// <summary>
        /// Deletes the exported file for this save data.
        /// </summary>
        /// <param name="filename">The filename to delete (usually you don't have to set this.)</param>
        public void ClearFile(string filename = "") {
            if (filename == "") filename = DefaultFilename;

            filename = DefaultPath + filename;
            if (!File.Exists(filename)) return;

            File.Delete(filename);
        }

        /// <summary>
        /// Clears the data.
        /// </summary>
        public void Clear() {
            data = new Dictionary<string, string>();
        }

        /// <summary>
        /// Check if an exported file exists for this data.
        /// </summary>
        /// <param name="filename">The filename to check.</param>
        /// <returns>True if the exported file exists, and is verified for encrypted files.</returns>
        public bool FileExists(string filename = "") {
            if (filename == "") filename = DefaultFilename;

            filename = DefaultPath + filename;
            if (File.Exists(filename)) {
                string loaded = File.ReadAllText(filename);

                if (ExportMode == DataExportMode.Data) {
                    return Verify(loaded);
                }
                else {
                    return true;
                }
            }

            return false;
        }

        /// <summary>
        /// Imports the data in the specified file.
        /// </summary>
        /// <param name="filename">The filename.</param>
        /// <param name="verify">if set to true verify the data before importing.</param>
        public void Import(string filename = "", bool verify = true) {
            if (filename == "") filename = DefaultFilename;

            filename = DefaultPath + filename;
            if (!File.Exists(filename)) return;

            string loaded = File.ReadAllText(filename);

            if (ExportMode == DataExportMode.Data) {
                if (Verify(loaded) || !verify) {
                    string[] split = Regex.Split(loaded, ":");
                    loaded = Util.DecompressString(split[1]);

                    var splitData = Regex.Split(loaded, ValueDelim);

                    foreach (var s in splitData) {
                        var entry = Regex.Split(s, KeyDelim);
                        var key = entry[0];
                        var value = entry[1];
                        if (data.ContainsKey(key))
                            data[key] = value;
                        else
                            data.Add(key, value);
                    }
                }
                else {
                    Util.Log("Data load failed: corrupt or modified data.");
                }
            }
            else {
                var split = loaded.Split('\n');
                foreach (var s in split) {
                    string[] entry = s.Split('=');
                    if (entry.Length == 2) {
                        SetData(entry[0].Replace((char)16, '='), entry[1].Replace((char)16, '='));
                    }
                }
            }
        }

        /// <summary>
        /// Exports the data to the specified file.
        /// </summary>
        /// <param name="filename">The filename.</param>
        public void Export(string filename = "") {
            if (filename == "") filename = DefaultFilename;

            filename = DefaultPath + filename;

            if (ExportMode == DataExportMode.Data) {
                string str = Util.CompressString(Util.DictionaryToString(data, KeyDelim, ValueDelim));

                string dataToHash = SaltGuide;
                dataToHash = dataToHash.Replace("{S}", EncryptionSalt);
                dataToHash = dataToHash.Replace("{D}", str);

                str = Util.MD5Hash(dataToHash) + ":" + str;

                File.WriteAllText(filename, str);
            }
            else {
                string str = "";
                foreach (var e in data) {
                    str += "" + e.Key.Replace('=', (char)16) + "=" + e.Value.Replace('=', (char)16) + "\n";
                }

                str = str.Trim();

                File.WriteAllText(filename, str);
            }
        }

        /// <summary>
        /// Gets the string with the specified key.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <returns>The string data or null.</returns>
        public string this[string key] {
            get {
                if (data.ContainsKey(key)) {
                    return data[key];
                }
                return null;
            }
        }

        /// <summary>
        /// Gets the string with the specified key.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <returns>The string data or null.</returns>
        public string this[Enum key] {
            get {
                return this[Util.EnumValueToString(key)];
            }
        }

        /// <summary>
        /// Gets a float from the data.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <returns>A float from the specified key.</returns>
        public float GetFloat(string key) {
            return float.Parse(data[key]);
        }

        /// <summary>
        /// Gets a float from the data.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <returns>A float from the specified key.</returns>
        public float GetFloat(Enum key) {
            return GetFloat(Util.EnumValueToString(key));
        }

        /// <summary>
        /// Gets a float or a default float value.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="defaultIfNotFound">The default if not found.</param>
        /// <returns>The value or the default if a value is not found.</returns>
        public float GetFloatOrDefault(string key, float defaultIfNotFound = default(float)) {
            if (data.ContainsKey(key)) {
                if (string.IsNullOrEmpty(data[key])) {
                    SetData(key, defaultIfNotFound);
                    return defaultIfNotFound;
                }
                float test = 0;
                if (!float.TryParse(data[key], out test)) {
                    SetData(key, defaultIfNotFound);
                    return defaultIfNotFound;
                }
                return GetFloat(key);
            }
            SetData(key, defaultIfNotFound);
            return defaultIfNotFound;
        }

        /// <summary>
        /// Gets a float or a default float value.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="defaultIfNotFound">The default if not found.</param>
        /// <returns>The value or the default if the key is not found.</returns>
        public float GetFloatOrDefault(Enum key, float defaultIfNotFound = default(float)) {
            return GetFloatOrDefault(Util.EnumValueToString(key), defaultIfNotFound);
        }

        /// <summary>
        /// Gets an int from the data.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <returns>An int from the specified key.</returns>
        public int GetInt(string key) {
            return int.Parse(data[key]);
        }

        /// <summary>
        /// Gets an int from the data.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <returns>An int from the specified key.</returns>
        public int GetInt(Enum key) {
            return GetInt(Util.EnumValueToString(key));
        }

        /// <summary>
        /// Gets an int or a default int value.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="defaultIfNotFound">The default if not found.</param>
        /// <returns>The value or the default if the key is not found.</returns>
        public int GetIntOrDefault(string key, int defaultIfNotFound = default(int)) {
            if (data.ContainsKey(key)) {
                if (string.IsNullOrEmpty(data[key])) {
                    SetData(key, defaultIfNotFound);
                    return defaultIfNotFound;
                }
                int test = 0;
                if (!int.TryParse(data[key], out test)) {
                    SetData(key, defaultIfNotFound);
                    return defaultIfNotFound;
                }
                return GetInt(key);
            }
            SetData(key, defaultIfNotFound);
            return defaultIfNotFound;
        }

        /// <summary>
        /// Gets an int or a default int value.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="defaultIfNotFound">The default if not found.</param>
        /// <returns>The value or the default if the key is not found.</returns>
        public int GetIntOrDefault(Enum key, int defaultIfNotFound = default(int)) {
            return GetIntOrDefault(Util.EnumValueToString(key), defaultIfNotFound);
        }

        /// <summary>
        /// Gets a string from the data.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <returns>An int from the specified key.</returns>
        public string GetString(string key) {
            return this[key];
        }

        /// <summary>
        /// Gets a string from the data.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <returns>An int from the specified key.</returns>
        public string GetString(Enum key) {
            return this[key];
        }

        /// <summary>
        /// Gets a string or a default string value.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="defaultIfNotFound">The default if not found.</param>
        /// <returns>The value or the default if the key is not found.</returns>
        public string GetStringOrDefault(string key, string defaultIfNotFound = default(string)) {
            if (data.ContainsKey(key)) {
                if (string.IsNullOrEmpty(data[key])) {
                    SetData(key, defaultIfNotFound);
                    return defaultIfNotFound;
                }
                return GetString(key);
            }
            SetData(key, defaultIfNotFound);
            return defaultIfNotFound;
        }

        /// <summary>
        /// Gets a string or a default string value.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="defaultIfNotFound">The default if not found.</param>
        /// <returns>The value or the default if the key is not found.</returns>
        public string GetStringOrDefault(Enum key, string defaultIfNotFound = default(string)) {
            return GetStringOrDefault(Util.EnumValueToString(key), defaultIfNotFound);
        }

        /// <summary>
        /// Gets a bool from the data.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <returns>An int from the specified key.</returns>
        public bool GetBool(string key) {
            return bool.Parse(data[key]);
        }

        /// <summary>
        /// Gets a bool from the data.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <returns>An int from the specified key.</returns>
        public bool GetBool(Enum key) {
            return GetBool(Util.EnumValueToString(key));
        }

        /// <summary>
        /// Gets a bool or a default bool value.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="defaultIfNotFound">The default if not found.</param>
        /// <returns>The value or the default if the key is not found.</returns>
        public bool GetBoolOrDefault(string key, bool defaultIfNotFound = default(bool)) {
            if (data.ContainsKey(key)) {
                if (string.IsNullOrEmpty(data[key])) {
                    SetData(key, defaultIfNotFound);
                    return defaultIfNotFound;
                }
                bool test = false;
                if (!bool.TryParse(data[key], out test)) {
                    SetData(key, defaultIfNotFound);
                    return defaultIfNotFound;
                }
                return GetBool(key);
            }
            SetData(key, defaultIfNotFound);
            return defaultIfNotFound;
        }

        /// <summary>
        /// Gets a bool or a default bool value.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="defaultIfNotFound">The default if not found.</param>
        /// <returns>The value or the default if the key is not found.</returns>
        public bool GetBoolOrDefault(Enum key, bool defaultIfNotFound = default(bool)) {
            return GetBoolOrDefault(Util.EnumValueToString(key), defaultIfNotFound);
        }

        /// <summary>
        /// Sets the data.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="obj">The object.</param>
        public void SetData(string key, object obj) {
            if (data.ContainsKey(key)) {
                data[key] = obj.ToString();
            }
            else {
                data.Add(key, obj.ToString());
            }
        }

        /// <summary>
        /// Sets the data.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="obj">The object.</param>
        public void SetData(Enum key, object obj) {
            SetData(Util.EnumValueToString(key), obj);
        }
    }
}