using System;
using System.Collections.Generic;
using System.IO;
#if NET40
using System.Threading.Tasks;
#endif
using MPF.Check.Features;
using MPF.Frontend;
using MPF.Frontend.Features;
using SabreTools.CommandLine;
using SabreTools.CommandLine.Features;
using SabreTools.CommandLine.Inputs;
using SabreTools.RedumpLib.Data;
using SabreTools.RedumpLib.Web;

namespace MPF.Check
{
    public class Program
    {
        #region Inputs

        private const string _createIrdName = "create-ird";
        private static readonly FlagInput _createIrdInput = new(_createIrdName, "--create-ird", "Create IRD from output files (PS3 only)");

        private const string _deleteName = "delete";
        private static readonly FlagInput _deleteInput = new(_deleteName, ["-d", "--delete"], "Enable unnecessary file deletion");

        private const string _disableArchivesName = "disable-archives";
        private static readonly FlagInput _disableArchivesInput = new(_disableArchivesName, "--disable-archives", "Disable scanning archives (requires --scan)");

        private const string _enableDebugName = "enable-debug";
        private static readonly FlagInput _enableDebugInput = new(_enableDebugName, "--enable-debug", "Enable debug protection information (requires --scan)");

        private const string _hideDriveLettersName = "hide-drive-letters";
        private static readonly FlagInput _hideDriveLettersInput = new(_hideDriveLettersName, "--hide-drive-letters", "Hide drive letters from scan output (requires --scan)");

        private const string _includeArtifactsName = "include-artifacts";
        private static readonly FlagInput _includeArtifactsInput = new(_includeArtifactsName, "--include-artifacts", "Include artifacts in JSON (requires --json)");

        private const string _jsonName = "json";
        private static readonly FlagInput _jsonInput = new(_jsonName, ["-j", "--json"], "Enable submission JSON output");

        private const string _loadSeedName = "load-seed";
        private static readonly StringInput _loadSeedInput = new(_loadSeedName, "--load-seed", "Load a seed submission JSON for user information");

        private const string _noPlaceholdersName = "no-placeholders";
        private static readonly FlagInput _noPlaceholdersInput = new(_noPlaceholdersName, "--no-placeholders", "Disable placeholder values in submission info");

        private const string _noRetrieveName = "no-retrieve";
        private static readonly FlagInput _noRetrieveInput = new(_noRetrieveName, "--no-retrieve", "Disable retrieving match information from Redump");

        private const string _pathName = "path";
        private static readonly StringInput _pathInput = new(_pathName, ["-p", "--path"], "Physical drive path for additional checks");

        private const string _pullAllName = "pull-all";
        private static readonly FlagInput _pullAllInput = new(_pullAllName, "--pull-all", "Pull all information from Redump (requires --credentials)");

        private const string _scanName = "scan";
        private static readonly FlagInput _scanInput = new(_scanName, ["-s", "--scan"], "Enable copy protection scan (requires --path)");

        private const string _suffixName = "suffix";
        private static readonly FlagInput _suffixInput = new(_suffixName, ["-x", "--suffix"], "Enable adding filename suffix");

        private const string _useName = "use";
        private static readonly StringInput _useInput = new(_useName, ["-u", "--use"], "Override configured dumping program name");

        private const string _zipName = "zip";
        private static readonly FlagInput _zipInput = new(_zipName, ["-z", "--zip"], "Enable log file compression");

        #endregion

        public static void Main(string[] args)
        {
            // Create the command set
            var commandSet = CreateCommands();

            // If we have no args, show the help and quit
            if (args == null || args.Length == 0)
            {
                DisplayHelp();
                return;
            }

            // Setup common outputs
            Options options;
            CommandOptions opts;
            RedumpSystem? knownSystem;
            int startIndex;

            // Get the first argument as a feature flag
            string featureName = args[0];

            // Try processing the standalone arguments
            var topLevel = commandSet.GetTopLevel(featureName);
            switch (topLevel)
            {
                // Standalone Options
                case Help: DisplayHelp(); return;
                case VersionFeature version: version.Execute(); return;
                case ListCodesFeature lc: lc.Execute(); return;
                case ListMediaTypesFeature lm: lm.Execute(); return;
                case ListProgramsFeature lp: lp.Execute(); return;
                case ListSystemsFeature ls: ls.Execute(); return;

                // Interactive Mode
                case InteractiveFeature interactive:
                    startIndex = 1;
                    interactive.Execute();

                    opts = interactive.CommandOptions;
                    options = interactive.Options;
                    knownSystem = interactive.System;
                    break;

                // Default Behavior
                default:
                    startIndex = 0;

                    var mainFeature = new MainFeature();
                    mainFeature.ProcessArgs(args, 0);

                    opts = mainFeature.CommandOptions;
                    options = mainFeature.Options;
                    knownSystem = Extensions.ToRedumpSystem(featureName.Trim('"'));

                    args = [.. mainFeature.Inputs];
                    break;
            }

            if (options.InternalProgram == InternalProgram.NONE)
            {
                DisplayHelp("A program name needs to be provided");
                return;
            }

            // Validate the supplied credentials
            if (options.RetrieveMatchInformation
                && !string.IsNullOrEmpty(options.RedumpUsername)
                && !string.IsNullOrEmpty(options.RedumpPassword))
            {
                bool? validated = RedumpClient.ValidateCredentials(options.RedumpUsername!, options.RedumpPassword!).GetAwaiter().GetResult();
                string message = validated switch
                {
                    true => "Redump username and password accepted!",
                    false => "Redump username and password denied!",
                    null => "An error occurred validating your credentials!",
                };

                Console.WriteLine(message);
            }

            // Loop through all the rest of the args
            for (int i = startIndex; i < args.Length; i++)
            {
                // Check for a file
                if (!File.Exists(args[i].Trim('"')))
                {
                    DisplayHelp($"{args[i].Trim('"')} does not exist");
                    return;
                }

                // Get the full file path
                string filepath = Path.GetFullPath(args[i].Trim('"'));

                // Now populate an environment
                Drive? drive = null;
                if (!string.IsNullOrEmpty(opts.DevicePath))
                    drive = Drive.Create(null, opts.DevicePath!);

                var env = new DumpEnvironment(options,
                    filepath,
                    drive,
                    knownSystem,
                    internalProgram: null);
                env.SetProcessor();

                // Finally, attempt to do the output dance
                var result = env.VerifyAndSaveDumpOutput(seedInfo: opts.Seed)
                    .ConfigureAwait(false).GetAwaiter().GetResult();
                Console.WriteLine(result.Message);
            }
        }

        /// <summary>
        /// Create the command set for the program
        /// </summary>
        private static CommandSet CreateCommands()
        {
            List<string> header = [
                "MPF.CLI [standalone|system] [options] <path> ...",
                string.Empty,
            ];

            List<string> footer = [
                string.Empty,
                "WARNING: Check will overwrite both any existing submission information files as well",
                "as any log archives. Please make backups of those if you need to before running Check.",
                string.Empty,
            ];

            var commandSet = new CommandSet(header, footer);

            // Standalone Options
            commandSet.Add(new Help());
            commandSet.Add(new VersionFeature());
            commandSet.Add(new ListCodesFeature());
            commandSet.Add(new ListMediaTypesFeature());
            commandSet.Add(new ListSystemsFeature());
            commandSet.Add(new ListProgramsFeature());
            commandSet.Add(new InteractiveFeature());

            // Check Options
            commandSet.Add(_useInput);
            commandSet.Add(_loadSeedInput);
            commandSet.Add(_noPlaceholdersInput);
            commandSet.Add(_createIrdInput);
            commandSet.Add(_noRetrieveInput);
            // TODO: Figure out how to work with the credentials input
            commandSet.Add(_pullAllInput);
            commandSet.Add(_pathInput);
            commandSet.Add(_scanInput);
            commandSet.Add(_disableArchivesInput);
            commandSet.Add(_enableDebugInput);
            commandSet.Add(_hideDriveLettersInput);
            commandSet.Add(_suffixInput);
            commandSet.Add(_jsonInput);
            commandSet.Add(_includeArtifactsInput);
            commandSet.Add(_zipInput);
            commandSet.Add(_deleteInput);

            return commandSet;
        }

        /// <summary>
        /// Display help for MPF.Check
        /// </summary>
        /// <param name="error">Error string to prefix the help text with</param>
        private static void DisplayHelp(string? error = null)
        {
            if (error != null)
                Console.WriteLine(error);

            Console.WriteLine("Usage:");
            Console.WriteLine("MPF.Check <system> [options] </path/to/output.cue/iso> ...");
            Console.WriteLine();
            Console.WriteLine("Standalone Options:");
            Console.WriteLine("?, h, help              Show this help text");
            Console.WriteLine("version                 Print the program version");
            Console.WriteLine("lc, listcodes           List supported comment/content site codes");
            Console.WriteLine("lm, listmedia           List supported media types");
            Console.WriteLine("ls, listsystems         List supported system types");
            Console.WriteLine("lp, listprograms        List supported dumping program outputs");
            Console.WriteLine("i, interactive          Enable interactive mode");
            Console.WriteLine();

            Console.WriteLine("Check Options:");
            Console.WriteLine("-u, --use <program>            Dumping program output type [REQUIRED]");
            Console.WriteLine("    --load-seed <path>         Load a seed submission JSON for user information");
            Console.WriteLine("    --no-placeholders          Disable placeholder values in submission info");
            Console.WriteLine("    --create-ird               Create IRD from output files (PS3 only)");
            Console.WriteLine("    --no-retrieve              Disable retrieving match information from Redump");
            Console.WriteLine("-c, --credentials <user> <pw>  Redump username and password (incompatible with --no-retrieve)");
            Console.WriteLine("    --pull-all                 Pull all information from Redump (requires --credentials)");
            Console.WriteLine("-p, --path <drivepath>         Physical drive path for additional checks");
            Console.WriteLine("-s, --scan                     Enable copy protection scan (requires --path)");
            Console.WriteLine("    --disable-archives         Disable scanning archives (requires --scan)");
            Console.WriteLine("    --enable-debug             Enable debug protection information (requires --scan)");
            Console.WriteLine("    --hide-drive-letters       Hide drive letters from scan output (requires --scan)");
            Console.WriteLine("-x, --suffix                   Enable adding filename suffix");
            Console.WriteLine("-j, --json                     Enable submission JSON output");
            Console.WriteLine("    --include-artifacts        Include artifacts in JSON (requires --json)");
            Console.WriteLine("-z, --zip                      Enable log file compression");
            Console.WriteLine("-d, --delete                   Enable unnecessary file deletion");
            Console.WriteLine();
            Console.WriteLine("WARNING: Check will overwrite both any existing submission information files as well");
            Console.WriteLine("as any log archives. Please make backups of those if you need to before running Check.");
            Console.WriteLine();
        }

        /// <summary>
        /// Represents commandline options
        /// </summary>
        internal class CommandOptions
        {
            /// <summary>
            /// Seed submission info from an input file
            /// </summary>
            public SubmissionInfo? Seed { get; set; } = null;

            /// <summary>
            /// Path to the device to scan
            /// </summary>
            public string? DevicePath { get; set; } = null;
        }
    }
}