using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using Newtonsoft.Json;
using EliteBGS.BGS;

namespace EliteBGS.Util {
    public class Config {
        private string config_folder = null;
        private string objectives_file = null;
        private string config_file = null;

        private AppConfig global_config = new AppConfig();

        public Config() {
            DetermineConfigFolder();
            global_config.PropertyChanged += Global_config_PropertyChanged;
        }

        private void Global_config_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) {
            try {
                SaveGlobal();
            } catch (Exception) {
                /* ignored */
            }
        }

        public string ConfigPath => config_folder;

        public AppConfig Global => global_config;

        private void DetermineConfigFolder() {
            string folder = Environment.ExpandEnvironmentVariables("%appdata%\\EliteBGS");

            if (!Directory.Exists(folder)) {
                Directory.CreateDirectory(folder);
            }

            config_folder = folder;

            objectives_file = Path.Combine(config_folder, "objectives.json");
            config_file = Path.Combine(config_folder, "config.json");
        }

        public void SaveGlobal() {
            var serializer = JsonSerializer.CreateDefault();
            using (var file = new StreamWriter(File.OpenWrite(config_file), Encoding.UTF8)) {
                var stream = new JsonTextWriter(file);
                serializer.Serialize(stream, global_config);
            }
        }

        public void LoadGlobal() {
            var serializer = JsonSerializer.CreateDefault();
            using (var file = new StreamReader(File.OpenRead(config_file), Encoding.UTF8)) {
                var stream = new JsonTextReader(file);
                var app = serializer.Deserialize<AppConfig>(stream);

                if (app != null) {
                    this.global_config = app;
                    global_config.PropertyChanged += Global_config_PropertyChanged;
                }
            }
        }

        public void SaveObjectives(Report report) {
            var serializer = JsonSerializer.CreateDefault();
            using (var file = new StreamWriter(File.OpenWrite(objectives_file), Encoding.UTF8)) {
                var stream = new JsonTextWriter(file);
                serializer.Serialize(stream, report.Objectives);
            }
        }

        public void LoadObjectives(Report report) {
            var serializer = JsonSerializer.CreateDefault();
            using (var file = new StreamReader(File.OpenRead(objectives_file), Encoding.UTF8)) {
                var stream = new JsonTextReader(file);
                var objectives = serializer.Deserialize<List<Objective>>(stream);

                report.Objectives = objectives;
            }
        }
    }
}