using System;
using System.Collections.Generic;
using System.IO;
#if NET462_OR_GREATER || NETCOREAPP
using SharpCompress.Archives;
using SharpCompress.Archives.Zip;
#endif

namespace MPF.Processors.OutputFiles
{
    /// <summary>
    /// Represents a single output file
    /// </summary>
    internal class OutputFile
    {
        /// <summary>
        /// Set of all filename variants
        /// </summary>
        public string[] Filenames { get; private set; }

        /// <summary>
        /// Key used when creating an artifact
        /// </summary>
        public string? ArtifactKey { get; private set; }

        /// <summary>
        /// Indicates if the file is required
        /// </summary>
        public bool IsRequired
        {
            get
            {
#if NET20 || NET35
                return (_flags & OutputFileFlags.Required) != 0;
#else
                return _flags.HasFlag(OutputFileFlags.Required);
#endif
            }
        }

        /// <summary>
        /// Indicates if the file is an artifact
        /// </summary>
        public bool IsArtifact
        {
            get
            {
#if NET20 || NET35
                return (_flags & OutputFileFlags.Artifact) != 0
                    || (_flags & OutputFileFlags.Binary) != 0;
#else
                return _flags.HasFlag(OutputFileFlags.Artifact)
                    || _flags.HasFlag(OutputFileFlags.Binary);
#endif
            }
        }

        /// <summary>
        /// Indicates if the file is a binary artifact
        /// </summary>
        public bool IsBinaryArtifact
        {
            get
            {
#if NET20 || NET35
                return (_flags & OutputFileFlags.Binary) != 0;
#else
                return _flags.HasFlag(OutputFileFlags.Binary);
#endif
            }
        }

        /// <summary>
        /// Indicates if the file is deleteable after processing
        /// </summary>
        public bool IsDeleteable
        {
            get
            {
#if NET20 || NET35
                return (_flags & OutputFileFlags.Deleteable) != 0;
#else
                return _flags.HasFlag(OutputFileFlags.Deleteable);
#endif
            }
        }

        /// <summary>
        /// Indicates if the file is zippable after processing
        /// </summary>
        public bool IsZippable
        {
            get
            {
#if NET20 || NET35
                return (_flags & OutputFileFlags.Zippable) != 0
                    || (_flags & OutputFileFlags.Preserve) != 0;
#else
                return _flags.HasFlag(OutputFileFlags.Zippable)
                    || _flags.HasFlag(OutputFileFlags.Preserve);
#endif
            }
        }

        /// <summary>
        /// Indicates if the file is preserved after zipping
        /// </summary>
        public bool IsPreserved
        {
            get
            {
#if NET20 || NET35
                return (_flags & OutputFileFlags.Preserve) != 0;
#else
                return _flags.HasFlag(OutputFileFlags.Preserve);
#endif
            }
        }

        /// <summary>
        /// Represents attributes about the current file
        /// </summary>
        protected readonly OutputFileFlags _flags;

        /// <summary>
        /// Create an OutputFile with a single filename
        /// </summary>
        public OutputFile(string filename, OutputFileFlags flags)
            : this([filename], flags)
        {
        }

        /// <summary>
        /// Create an OutputFile with a single filename
        /// </summary>
        public OutputFile(string filename, OutputFileFlags flags, string artifactKey)
            : this([filename], flags, artifactKey)
        {
        }

        /// <summary>
        /// Create an OutputFile with set of filenames
        /// </summary>
        public OutputFile(string[] filenames, OutputFileFlags flags)
        {
            Filenames = filenames;
            ArtifactKey = null;
            _flags = flags;

            // Validate the inputs
            if (filenames.Length == 0)
                throw new ArgumentException($"{nameof(filenames)} must contain at least one value");
            if (IsArtifact && string.IsNullOrEmpty(ArtifactKey))
                throw new ArgumentException($"{nameof(flags)} should not contain the Artifact or Binary flag");
        }

        /// <summary>
        /// Create an OutputFile with set of filenames
        /// </summary>
        public OutputFile(string[] filenames, OutputFileFlags flags, string artifactKey)
        {
            Filenames = filenames;
            ArtifactKey = artifactKey;
            _flags = flags;

            // Validate the inputs
            if (filenames.Length == 0)
                throw new ArgumentException($"{nameof(filenames)} must contain at least one value");
            if (IsArtifact && string.IsNullOrEmpty(ArtifactKey))
                throw new ArgumentException($"{nameof(flags)} should not contain the Artifact or Binary flag");
        }

        /// <summary>
        /// Indicates if an output file exists in a base directory
        /// </summary>
        /// <param name="outputDirectory">Base directory to check in</param>
        public virtual bool Exists(string outputDirectory)
        {
            // Ensure the directory exists
            if (!Directory.Exists(outputDirectory))
                return false;

            foreach (string filename in Filenames)
            {
                // Check for invalid filenames
                if (string.IsNullOrEmpty(filename))
                    continue;

                try
                {
                    string possibleFile = Path.Combine(outputDirectory, filename);
                    if (File.Exists(possibleFile))
                        return true;
                }
                catch { }
            }

            return false;
        }

#if NET462_OR_GREATER || NETCOREAPP
        /// <summary>
        /// Indicates if an output file exists in an archive
        /// </summary>
        /// <param name="archive">Zip archive to check in</param>
        public virtual bool Exists(ZipArchive? archive)
        {
            // If the archive is invalid
            if (archive is null)
                return false;

            // Get list of all files in archive
            foreach (var entry in archive.Entries)
            {
                if (entry.Key is null)
                    continue;

                if (Array.Exists(Filenames, filename => entry.Key == filename))
                    return true;
            }

            return false;
        }

        /// <summary>
        /// Extracts an output file from a zip archive
        /// </summary>
        /// <param name="archive">Zip archive to check in</param>
        /// <param name="outputDirectory">Base directory to extract to</param>
        /// <returns>True if file extracted, False otherwise</returns>
        public virtual bool Extract(ZipArchive? archive, string outputDirectory)
        {
            // If the archive is invalid
            if (archive is null)
                return false;

            // Get list of all files in archive
            foreach (var entry in archive.Entries)
            {
                if (entry.Key is null)
                    continue;

                var matches = Array.FindAll(Filenames, filename => entry.Key == filename);
                foreach (string match in matches)
                {
                    try
                    {
                        string outputPath = Path.Combine(outputDirectory, match);
                        entry.WriteToFile(outputPath);
                    }
                    catch { }
                }
            }

            return true;
        }
#endif

        /// <summary>
        /// Get all matching paths for the file
        /// </summary>
        /// <param name="outputDirectory">Base directory to check in</param>
        public virtual List<string> GetPaths(string outputDirectory)
        {
            List<string> paths = [];

            foreach (string filename in Filenames)
            {
                string possibleFile = Path.Combine(outputDirectory, filename);
                if (!File.Exists(possibleFile))
                    continue;

                paths.Add(possibleFile);
            }

            return paths;
        }
    }
}