using System;
using System.Linq;
using System.Collections.Generic;
using System.IO;

namespace EDJournal {
    public class PlayerJournal {
        public static string DefaultPath = "%UserProfile%\\Saved Games\\Frontier Developments\\Elite Dangerous";

        private List<JournalFile> journalfiles = new List<JournalFile>();
        private string basepath = null;

        public string Location => basepath;

        public PlayerJournal() {
            Initialise(DefaultPath);
        }

        public PlayerJournal(string path) {
            Initialise(path);
        }

        private void Initialise(string path) {
            basepath = Environment.ExpandEnvironmentVariables(path);
            ScanFiles();
        }

        public List<JournalFile> Files {
            get { return journalfiles; }
        }

        public void Open() {
            if (!Directory.Exists(basepath)) {
                throw new JournalException("Invalid base path, path could not be found");
            }
            this.ScanFiles();
        }

        public JournalFile GetLastFile() {
            var lastfile = Files
                .GroupBy(x => x.Timestamp)
                .Last()
                .ToArray<JournalFile>()
                .Last()
                ;
            return lastfile;
        }

        public void ScanFiles() { 
            var files = Directory.EnumerateFiles(basepath);

            journalfiles.Clear();

            foreach (var file in files) {
                string full = Path.Combine(basepath, file);
                try {
                    JournalFile journalfile = new JournalFile(full);
                    journalfiles.Add(journalfile);
                } catch (JournalException) {
                    /* invalid journal file, or one of the other json files in there */
                    continue;
                }
            }

            journalfiles.Sort();
        }
    }
}