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

namespace MPF.Processors.OutputFiles
{
    /// <summary>
    /// Represents a single output file with custom detection rules
    /// </summary>
    internal class CustomOutputFile : OutputFile
    {
        /// <summary>
        /// Optional func for determining if a file exists
        /// </summary>
        private readonly Func<string, bool> _existsFunc;

        /// <summary>
        /// Create an OutputFile with a single filename
        /// </summary>
        public CustomOutputFile(string filename, OutputFileFlags flags, Func<string, bool> existsFunc)
            : base([filename], flags)
        {
            _existsFunc = existsFunc;
        }

        /// <summary>
        /// Create an OutputFile with a single filename
        /// </summary>
        public CustomOutputFile(string filename, OutputFileFlags flags, string artifactKey, Func<string, bool> existsFunc)
            : base([filename], flags, artifactKey)
        {
            _existsFunc = existsFunc;
        }

        /// <summary>
        /// Create an OutputFile with set of filenames
        /// </summary>
        public CustomOutputFile(string[] filenames, OutputFileFlags flags, Func<string, bool> existsFunc)
            : base(filenames, flags)
        {
            _existsFunc = existsFunc;
        }

        /// <summary>
        /// Create an OutputFile with set of filenames
        /// </summary>
        public CustomOutputFile(string[] filenames, OutputFileFlags flags, string artifactKey, Func<string, bool> existsFunc)
            : base(filenames, flags, artifactKey)
        {
            _existsFunc = existsFunc;
        }

        /// <inheritdoc/>
        public override 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 (_existsFunc(possibleFile))
                        return true;
                }
                catch { }
            }

            return false;
        }

#if NET462_OR_GREATER || NETCOREAPP
        /// <inheritdoc/>
        public override bool Exists(ZipArchive? archive)
        {
            // Files aren't extracted so this check can't be done
            return false;
        }

        /// <inheritdoc/>
        public override bool Extract(ZipArchive? archive, string outputDirectory)
        {
            // Files aren't extracted so this check can't be done
            return false;
        }
#endif

        /// <inheritdoc/>
        public override List<string> GetPaths(string outputDirectory)
        {
            List<string> paths = [];

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

                paths.Add(possibleFile);
            }

            return paths;
        }
    }
}