using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing.Printing;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Text.RegularExpressions;

namespace Proostenkrant.NET
{

    internal static class GoogleFormsReader
    {
        const string tsvDataUrl = "https://docs.google.com/spreadsheets/d/e/2PACX-1vRfxfdT8f4MQjXWmZylnXCGl14T0x5mxNw3W1Xd8GrZfPivjcqRGIvmb2YoAf77M00PrGPSJ6Zo-hRs/pub?output=tsv";
        const string downloadURL = "https://drive.google.com/uc?export=download&id=FILEID";
        public static string[][] GetData()
        {
            var tsvData = GetTsvData();
            var data = ConvertData(tsvData);
            data = FilterByTimestamp(data);
            var imageNames = LoadImages(data);

            return data.Select((v, i) =>
            {
                v[5] = imageNames[i];
                return v;
            }).ToArray();
        }

        static string GetTsvData()
        {
            var client = new HttpClient();
            var downloadTsvTask = client.GetStringAsync(tsvDataUrl);
            downloadTsvTask.Wait();
            return downloadTsvTask.Result;
        }

        static string[][] ConvertData(string tsvData)
        {
            // Split rows
            var tsvRows = tsvData.Split('\r').Where(v => v.Length > 0);
            // Split values
            var rows = tsvRows.Select(r => r.Split('\t').Where(v => v.Length > 0));
            // Remove header rows
            rows = rows.ToList().GetRange(2, rows.Count() - 2);

            return rows.Select(r => r.ToArray()).ToArray();
        }

        static string[][] FilterByTimestamp(string[][] data)
        {
            Console.WriteLine("Filter by starting date");
            var startDate = DateTime.Parse(Console.ReadLine(), CultureInfo.CreateSpecificCulture("nl-BE"));

            return data.Where(row => {
                var timeStamp = DateTime.Parse(row[0].Trim('\n'), CultureInfo.CreateSpecificCulture("nl-BE"));
                return startDate < timeStamp; 
            }).ToArray();
        }

        static string[] LoadImages(string[][] data)
        {
            var names = new List<string>();

            foreach (var row in data)
            {
                var name = Regex.Replace(row[2], string.Concat(Path.GetInvalidFileNameChars()), string.Empty, RegexOptions.Compiled);
                name = name.Replace(":", "");
                names.Add(name);

                var filename = Program.c_articleImagesPath + $"/{name}.jpg";
                if (File.Exists(filename)) continue;

                var id = row[5].Replace("https://drive.google.com/open?id=", string.Empty);
                var url = downloadURL.Replace("FILEID", id);

                Console.WriteLine("Downloading images using the browser...");
                var process = Process.Start(url);
                process.WaitForExit();

                Console.Write("Drag image here : ");
                var path = Console.ReadLine()
                    .Trim('\"')
                    .Replace("file:///", "")
                    .Replace("%20", " ");
                File.Copy(path, filename);
            }
            return names.ToArray();
        }
    }
}