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

namespace Lab5.TouristInformationCenter
{
    /// <summary>
    /// Class that stores functions that are related to reading and writing data
    /// </summary>
    class InOutUtils
    {
        /// <summary>
        /// Append the locations from the second container to the first one
        /// </summary>
        /// <param name="container1">First container</param>
        /// <param name="container2">Second container</param>
        private static void AppendContainer(LocationsContainer container1, LocationsContainer container2)
        {
            for (int i = 0; i < container2.Count; i++)
            {
                container1.Add(container2.Get(i));
            }
        }

        /// <summary>
        /// Decode a list of locations from a given list of lines.
        /// </summary>
        /// <param name="lines"></param>
        /// <returns>Container of locations</returns>
        public static LocationsContainer DecodeLocations(List<string> lines)
        {
            LocationsContainer container = new LocationsContainer(lines.Count-2);
            string city = lines[0];
            string manager = lines[1];
            for (int i = 2; i < lines.Count; i++)
            {
                string line = lines[i];
                string[] values = line.Split(';', StringSplitOptions.RemoveEmptyEntries);
                string name = values[0];
                string address = values[1];
                int year = int.Parse(values[2]);

                Location location;
                if (values.Length == 5)
                {
                    string author = values[3];
                    string monumentName = values[4];
                    location = new Statue(city, manager, name, address, year, author, monumentName);
                }
                else if (values.Length == 13)
                {
                    string type = values[3];
                    List<Weekday> workdays = new List<Weekday>();
                    for (int j = 1; j <= 7; j++)
                    {
                        if (int.Parse(values[j + 3]) == 1)
                        {
                            workdays.Add((Weekday)j);
                        }
                    }
                    double price = double.Parse(values[11]);
                    bool hasGuide = int.Parse(values[12]) == 1;
                    location = new Museum(city, manager, name, address, year, type, workdays, price, hasGuide);
                }
                else
                {
                    throw new Exception($"Attempt to parse unknown line: {lines[i]}");
                }

                container.Add(location);
            }
            return container;
        }

        /// <summary>
        /// Read and decode a list of locations from a file.
        /// </summary>
        /// <param name="filename">Target file</param>
        /// <returns>Container of locations</returns>
        public static LocationsContainer ReadLocationsFromCSV(string filename)
        {
            List<string> lines = new List<string>();
            foreach (string line in File.ReadAllLines(filename, Encoding.UTF8))
            {
                lines.Add(line);
            }
            return DecodeLocations(lines);
        }

        /// <summary>
        /// Read all the entries from a zip file and decode the locations inside the csv entries.
        /// </summary>
        /// <param name="filename">Target filename</param>
        /// <returns>Register of locations</returns>
        public static LocationsContainer ReadLocationsFromZIP(string filename)
        {
            LocationsContainer mainContainer = new LocationsContainer();

            using (ZipArchive zipFile = ZipFile.Open(filename, ZipArchiveMode.Read))
            {
                foreach (ZipArchiveEntry entry in zipFile.Entries)
                {
                    if (!entry.Name.EndsWith(".csv")) continue;
                    List<string> lines = new List<string>();
                    using (StreamReader reader = new StreamReader(entry.Open(), Encoding.UTF8))
                    {
                        while (!reader.EndOfStream)
                        {
                            lines.Add(reader.ReadLine());
                        }
                    }

                    LocationsContainer contaienr = DecodeLocations(lines);
                    AppendContainer(mainContainer, contaienr);
                }

            }

            return mainContainer;
        }

        /// <summary>
        /// Read and decode lists of locations from multiple files and put into a single register.
        /// </summary>
        /// <param name="filenames">Target files</param>
        /// <returns>Register containing locations from all files</returns>
        public static LocationsContainer ReadLocations(params string[] filenames)
        {
            LocationsContainer mainContainer = new LocationsContainer();
            foreach (string filename in filenames)
            {
                if (filename.EndsWith(".csv"))
                {
                    AppendContainer(mainContainer, ReadLocationsFromCSV(filename));
                }
                else if(filename.EndsWith(".zip"))
                {
                    AppendContainer(mainContainer, ReadLocationsFromZIP(filename));
                }
            }
            return mainContainer;
        }

        private static string CreateLocationLine(Location location)
        {
            if (location is Museum)
            {
                Museum m = location as Museum;
                string workDays = "";
                workDays += m.Workdays.Contains(Weekday.Monday) ? "1" : "0";
                workDays += m.Workdays.Contains(Weekday.Tuesday) ? ";1" : ";0";
                workDays += m.Workdays.Contains(Weekday.Wednesday) ? ";1" : ";0";
                workDays += m.Workdays.Contains(Weekday.Thursday) ? ";1" : ";0";
                workDays += m.Workdays.Contains(Weekday.Friday) ? ";1" : ";0";
                workDays += m.Workdays.Contains(Weekday.Saturday) ? ";1" : ";0";
                workDays += m.Workdays.Contains(Weekday.Sunday) ? ";1" : ";0";
                return String.Join(";", m.Name, m.Address, m.Year, m.Type, workDays, m.Price, m.HasGuide ? "1" : "0");
            }
            else if (location is Statue)
            {
                Statue s = location as Statue;
                return String.Join(";", s.Name, s.Address, s.Year, s.Author, s.MonumentName);
            } else
            {
                throw new Exception("What you doin??");
            }

        }

        /// <summary>
        /// Write and encode a list of locations to a file. The file will be in a csv format using ";" as seperators.
        /// </summary>
        /// <param name="filename">Target file</param>
        /// <param name="container">Container of locations</param>
        public static void WriteLocations(string filename, LocationsContainer container)
        {
            string[] lines = new string[container.Count];
            for (int i = 0; i < container.Count; i++)
            {
                Location location = container.Get(i);
                lines[i] = CreateLocationLine(location);
            }
            File.WriteAllLines(filename, lines, Encoding.UTF8);
        }

        /// <summary>
        /// Write and encode a list of statues from a container to a file
        /// </summary>
        /// <param name="filename">Target file</param>
        /// <param name="container">Target container</param>
        public static void WriteStatues(string filename, LocationsContainer container)
        {
            using (StreamWriter writer = File.CreateText(filename))
            {
                for (int i = 0; i < container.Count; i++)
                {
                    Statue statue = container.Get(i) as Statue;
                    if (statue != null)
                    {
                        writer.WriteLine("{0};{1};{2};{3};{4}", statue.Name, statue.Address, statue.Year, statue.Author, statue.MonumentName);
                    }
                }
            }
        }

        /// <summary>
        /// Write and encode a list of locations to a file from a register.
        /// </summary>
        /// <param name="filename">Target location</param>
        /// <param name="register">Register containing locations</param>
        public static void WriteLocations(string filename, Register register)
        {
            int n = register.Count();
            string[] lines = new string[n];
            for (int i = 0; i < n; i++)
            {
                Location location = register.GetByIndex(i);
                lines[i] = CreateLocationLine(location);
            }
            File.WriteAllLines(filename, lines, Encoding.UTF8);
        }

        /// <summary>
        /// Write out a container of locations in a table to the console.
        /// </summary>
        /// <param name="container">Container of locations</param>
        public static void PrintLocations(LocationsContainer container)
        {
            if (container.Count == 0)
            {
                Console.WriteLine("Nėra");
                return;
            }

            Console.WriteLine(new string('-', 84));
            Console.WriteLine("| {0,-10} | {1,-20} | {2,-18} | {3,-15} | {4,5} |", "Miestas", "Atsakingas", "Vardas", "Adresas", "Metai");
            Console.WriteLine(new string('-', 84));
            for (int i = 0; i < container.Count; i++)
            {
                Location l = container.Get(i);
                Console.WriteLine("| {0,-10} | {1,-20} | {2,-18} | {3,-15} | {4,5} |", l.City, l.Manager, l.Name, l.Address, l.Year);
            }
            Console.WriteLine(new string('-', 84));
        }

        /// <summary>
        /// Write out a list of locations in a table to the console from a register.
        /// </summary>
        /// <param name="register">Register containing locations</param>
        public static void PrintLocations(Register register)
        {
            LocationsContainer locations = new LocationsContainer();
            for (int i = 0; i < register.Count(); i++)
            {
                locations.Add(register.GetByIndex(i));
            }
            PrintLocations(locations);
        }
    }
}