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

namespace VidFilesUpgradeTool
{
    enum OperatingSystem
    {
        X86,
        X64
    }
    class SQliteStorageFileInfoDictionary
    {
        private readonly SQLiteConnection _connection;
        private const string IndexFileName = "StorageFileInfos.db";
        private readonly string _indexFilePath;

        public SQliteStorageFileInfoDictionary(string storageFolder)
        {
            _indexFilePath = Path.Combine(storageFolder, IndexFileName);

            PrepareLibraries(AppDomain.CurrentDomain.BaseDirectory);

            _connection = new SQLiteConnection(_indexFilePath);
        }

        private void PrepareLibraries(string storageFolder)
        {
            var packageSqliteDir = storageFolder;
            var libDest = Path.Combine(packageSqliteDir, "sqlite3.dll");
            if (File.Exists(libDest)) return;

            var libs = new Dictionary<OperatingSystem, string>
            {
                {OperatingSystem.X86, Path.Combine(packageSqliteDir, "sqlite3.x86.dll")},
                {OperatingSystem.X64, Path.Combine(packageSqliteDir, "sqlite3.x64.dll")}
            };

            File.Copy(Environment.Is64BitOperatingSystem ? libs[OperatingSystem.X64] : libs[OperatingSystem.X86], libDest);
            libs.Values.ToList().ForEach(File.Delete);
        }

        public StorageFileInfo GetStorageFileInfo(string token)
        {
            var findResult = _connection.Table<StorageFileInfo>().Where(x => x.Token == token).ToList();
            return findResult.FirstOrDefault();
        }

        public StorageFileInfo GetStorageFileInfoByName(string fileName)
        {
            var findResult = _connection.Table<StorageFileInfo>().Where(x => x.FileName == fileName).ToList();
            return findResult.FirstOrDefault();
        }
    }
}