///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  Note:
//     Ported literally SpecWeb99 source code.
//
//     Strongly avoid writing programs like this.
//
//     This file compiles under CSC for testing on Windows and SGC
//     on Singularity.


using System;
using System.IO;

#if SINGULARITY

using FileSystem.Utils;
using Microsoft.SingSharp;
using Microsoft.SingSharp.Runtime;
using Microsoft.Singularity;
using Microsoft.Singularity.Channels;
using Microsoft.Singularity.Directory;
using System.Text;
using Microsoft.Contracts;
using Microsoft.SingSharp.Reflection;
using Microsoft.Singularity.Applications;
using Microsoft.Singularity.Io;
using Microsoft.Singularity.Configuration;
[assembly: Transform(typeof(ApplicationResourceTransform))]

namespace Microsoft.Singularity.Applications
{
    [ConsoleCategory(HelpMessage="Generate files for Specweb. Output goes to directory/user.Personality", DefaultAction=true)]
    internal class Parameters
    {
        [InputEndpoint("data")]
        public readonly TRef<UnicodePipeContract.Exp:READY> Stdin;

        [OutputEndpoint("data")]
        public readonly TRef<UnicodePipeContract.Imp:READY> Stdout;

        [LongParameter( "n", Mandatory=true, HelpMessage="Max Load")]
        internal long maxLoad;

        [LongParameter( "t", Mandatory=true, HelpMessage="Number of Threads")]
        internal long threads;

        [StringParameter( "c", Mandatory=true,  HelpMessage="directory.")]
        internal string directory;

        reflective internal Parameters();

        internal int AppMain() {
            UpfGen99.AppMain(this);
            return 0;
        }
    }

    ///////////////////////////////////////
    // Quick and dirty abstraction of file operations
    //////////////////////////////////////

    public class FILE
    {
        private TRef<FileContract.Imp:Ready>! connRef;
        private long filePos;
        private string! path;

        public static FILE CreateFile(string! path)
        {
            if (FileUtils.CreateFile(path) != 0) {
                return null;
            }

            return OpenFile(path);
        }

        public static FILE OpenFile(string! path)
        {
            FileContract.Imp conn = FileUtils.OpenFile(path);

            if (conn != null) {
                return new FILE(conn, path);
            }
            else {
                return null;
            }
        }

        private FILE([Claims] FileContract.Imp:Ready! conn, string! thePath)
        {
            connRef = new TRef<FileContract.Imp:Ready>(conn);
            filePos = 0;
            path = thePath;
            base();
        }

        public int Write(string! str)
        {
            byte[] bytes = Encoding.ASCII.GetBytes(str);
            return Write(bytes, 0, bytes.Length);
        }

        public int Write(byte[]! buf, int offset, int length)
        {
            FileContract.Imp conn = connRef.Acquire();
            byte[]! in ExHeap bytes = Bitter.FromByteArray(buf, offset, length);

            try {
                long bytesWritten;
                int error;
                conn.SendWrite(bytes, 0, filePos, bytes.Length);
                conn.RecvAckWrite(out bytes, out bytesWritten, out error);
                delete bytes;
                filePos += bytesWritten;

                if (error != 0) {
                    return 0;
                }
            }
            finally {
                connRef.Release(conn);
            }

            return buf.Length;
        }

        public int Read(byte[]! buf, int offset, int maxLength)
        {
            FileContract.Imp conn = connRef.Acquire();
            byte[]! in ExHeap bytes = new[ExHeap] byte[maxLength];

            try {
                long bytesRead;
                int error;
                conn.SendRead(bytes, 0, filePos, bytes.Length);
                conn.RecvAckRead(out bytes, out bytesRead, out error);

                filePos += bytesRead;

                if (error != 0) {
                    delete bytes;
                    return 0;
                }

                Bitter.ToByteArray(bytes, 0, maxLength, buf, offset);
                delete bytes;
            }
            finally {
                connRef.Release(conn);
            }

            return buf.Length;
        }

        public int Size
        {
            // TODO
            get {
                FileAttributesRecord attr;
                ErrorCode error;

                bool ok = FileUtils.GetAttributes(path, out attr, out error);
                if (!ok) {
                    throw new Exception("Failed to get attributes");
                }
                return unchecked((int)attr.FileSize);
            }
        }

        public void Close()
        {
            FileContract.Imp conn = connRef.Acquire();

            try {
                conn.SendClose();
            }
            finally {
                connRef.Release(conn);
            }
        }
    }

    #else
namespace Microsoft.Singularity.Applications
{
    public class FILE
    {
        public static FILE CreateFile(string filename)
        {
            return (filename != null) ? new FILE() : null;
        }

        public void Write(string msg)
        {
            Console.Write(msg);
        }

        public void Close()
        {
        }
    }

    #endif // SINGULARITY

    public class UpfGen99
    {
        // Constants from client.h
        private const int CADFILE_ENTRIES = 360;
        private const string UserFile = "User.Personality";

        private static void Usage()
        {
            Console.WriteLine("upfgen99 -C <directory> -n maxload -t <threads>");
            Console.WriteLine("All arguments are mandatory.");
            Console.WriteLine("Output written to: <directory>/{0}", UserFile);
            Console.WriteLine("NB <directory> better exist.");
        }

#if  SINGULARITY
        internal static void AppMain(Parameters! config)
        {

            string /*!*/ directory = (!)config.directory;
            int maxload    = (int) config.maxLoad;         // Unsigned in upfgen99.c
            int maxthread  = (int) config.threads;         // Unsigned in upfgen99.c


            if (maxthread <= 0) {
                Usage();
                return;
            }

            if (maxthread > maxload) {
                maxload = maxthread;
            }

            string path;
            if (directory == "") {
                path = UserFile;
            }
            else if (directory[directory.Length - 1] == '/') {
                path = directory + UserFile;
            }
            else {
                path = directory + "/" + UserFile;
            }

            FILE file = FILE.CreateFile(path);
            if (file == null) {
                Console.WriteLine("Can't create file \"" + path + "\"");
                return;
            }

            // Cut-and-pasted from upfgen99.c

            for (int j = 0; j < maxload; j++) {
                int k = ((j % CADFILE_ENTRIES) * 10000)%12301;
                if (k == 0) k = 12300;
                int c4 = k        & 0xf;
                int c3 = (k >> 4)  & 0xf;
                int c2 = (k >> 8)  & 0xf;
                // int c1 = (k >> 12) & 0xf; // XXX: not used

                int gender =  (k) % 2;
                if (gender == 1) gender = 0x20000000;
                else           gender = 0x10000000;

                int age     = (k) % 4;
                if (age == 0) age = 0x08000000;
                else if (age == 1) age = 0x04000000;
                else if (age == 2) age = 0x02000000;
                else if (age == 3) age = 0x01000000;

                int area    = (c4 + c2) % 4;
                if (area == 0)     area = 0x00800000;
                else if (area == 1) area = 0x00400000;
                else if (area == 2) area = 0x00200000;
                else if (area == 3) area = 0x00100000;

                int interest1 = (c4 + c3) % 10;
                if (interest1 == 0) interest1 = 0x00080000;
                if (interest1 == 1) interest1 = 0x00040000;
                if (interest1 == 2) interest1 = 0x00020000;
                if (interest1 == 3) interest1 = 0x00010000;
                if (interest1 == 4) interest1 = 0x00008000;
                if (interest1 == 5) interest1 = 0x00004000;
                if (interest1 == 6) interest1 = 0x00002000;
                if (interest1 == 7) interest1 = 0x00001000;
                if (interest1 == 8) interest1 = 0x00000800;
                if (interest1 == 9) interest1 = 0x00000400;

                int interest2 = c4 % 10;
                if (interest2 == 0) interest2 = 0x00000200;
                else if (interest2 == 1) interest2 = 0x00000100;
                else if (interest2 == 2) interest2 = 0x00000080;
                else if (interest2 == 3) interest2 = 0x00000040;
                else if (interest2 == 4) interest2 = 0x00000020;
                else if (interest2 == 5) interest2 = 0x00000010;
                else if (interest2 == 6) interest2 = 0x00000008;
                else if (interest2 == 7) interest2 = 0x00000004;
                else if (interest2 == 8) interest2 = 0x00000002;
                else if (interest2 == 9) interest2 = 0x00000001;

                int combined = gender | age | area | interest1 | interest2;

                file.Write(String.Format("{0,5:d} {1,8:X}\n", j, combined));
            }
            file.Close();
        }
#else
        public static void Main(string[] /*!*/ args)
        {
    #if SINGULARITY
            const int ArgsStart = 1;
    #else
            const int ArgsStart = 0;
    #endif

            if (args == null || args.Length < (ArgsStart + 6)) {
                Console.WriteLine("Expecting 6 arguments, got {0}.",
                                args.Length - ArgsStart);
                Usage();
                return;
            }

            string /*!*/ directory = "";
            int maxload    = 0;         // Unsigned in upfgen99.c
            int maxthread  = 0;         // Unsigned in upfgen99.c
            bool needHelp  = false;

            int i;
            for (i = ArgsStart; i < args.Length; i++) {
                string /*!*/ arg = /*^ (!)^*/ args[i];
                if (arg.Length < 2 || (arg[0] != '-' && arg[0] != '/')) {
                    break;
                }

                if (args.Length - i >= 2) {
                    string /*!*/ optArg = /*^ (!)^*/ args[++i];
                    // Parameterized arguments
                    switch (Char.ToLower(arg[1])) {
                        case 'c':
                            directory = optArg;
                            break;
                        case 'n':
                            try {
                                maxload = Int32.Parse(optArg);
                            }
                            catch (Exception) {
                                Console.WriteLine("Invalid maxload: ", optArg);
                                return;
                            }
                            break;
                        case 't':
                            try {
                                maxthread = Int32.Parse(optArg);
                            }
                            catch (Exception) {
                                Console.WriteLine("Invalid maxthread: ", optArg);
                                return;
                            }
                            break;
                    }
                }
                else {
                    // Flag arguments
                    needHelp = true;
                }
            }

            if (maxthread == 0 || needHelp == true) {
                Usage();
                return;
            }

            if (maxthread > maxload) {
                maxload = maxthread;
            }

            string path;
            if (directory == "") {
                path = UserFile;
            }
            else if (directory[directory.Length - 1] == '/') {
                path = directory + UserFile;
            }
            else {
                path = directory + "/" + UserFile;
            }

            FILE file = FILE.CreateFile(path);
            if (file == null) {
                Console.WriteLine("Can't create file \"" + path + "\"");
                return;
            }

            // Cut-and-pasted from upfgen99.c

            for (int j = 0; j < maxload; j++) {
                int k = ((j % CADFILE_ENTRIES) * 10000)%12301;
                if (k == 0) k = 12300;
                int c4 = k        & 0xf;
                int c3 = (k >> 4)  & 0xf;
                int c2 = (k >> 8)  & 0xf;
                // int c1 = (k >> 12) & 0xf; // XXX: not used

                int gender =  (k) % 2;
                if (gender == 1) gender = 0x20000000;
                else           gender = 0x10000000;

                int age     = (k) % 4;
                if (age == 0) age = 0x08000000;
                else if (age == 1) age = 0x04000000;
                else if (age == 2) age = 0x02000000;
                else if (age == 3) age = 0x01000000;

                int area    = (c4 + c2) % 4;
                if (area == 0)     area = 0x00800000;
                else if (area == 1) area = 0x00400000;
                else if (area == 2) area = 0x00200000;
                else if (area == 3) area = 0x00100000;

                int interest1 = (c4 + c3) % 10;
                if (interest1 == 0) interest1 = 0x00080000;
                if (interest1 == 1) interest1 = 0x00040000;
                if (interest1 == 2) interest1 = 0x00020000;
                if (interest1 == 3) interest1 = 0x00010000;
                if (interest1 == 4) interest1 = 0x00008000;
                if (interest1 == 5) interest1 = 0x00004000;
                if (interest1 == 6) interest1 = 0x00002000;
                if (interest1 == 7) interest1 = 0x00001000;
                if (interest1 == 8) interest1 = 0x00000800;
                if (interest1 == 9) interest1 = 0x00000400;

                int interest2 = c4 % 10;
                if (interest2 == 0) interest2 = 0x00000200;
                else if (interest2 == 1) interest2 = 0x00000100;
                else if (interest2 == 2) interest2 = 0x00000080;
                else if (interest2 == 3) interest2 = 0x00000040;
                else if (interest2 == 4) interest2 = 0x00000020;
                else if (interest2 == 5) interest2 = 0x00000010;
                else if (interest2 == 6) interest2 = 0x00000008;
                else if (interest2 == 7) interest2 = 0x00000004;
                else if (interest2 == 8) interest2 = 0x00000002;
                else if (interest2 == 9) interest2 = 0x00000001;

                int combined = gender | age | area | interest1 | interest2;

                file.Write(String.Format("{0,5:d} {1,8:X}\n", j, combined));
            }
            file.Close();
        }

#endif
    }
}