/*******************************************************************************
 * FILE:         <usgsdown.cs>
 *
 * Downloads USGS geotiff quads from http://www.archive.org/
 *
 * @date 21/02/2012
 *
 */
using System;
using System.IO;
using System.Net;
using System.Collections.Generic;

namespace usgsdown
{
    class MainClass
    {
        public static int Main (string[] args)
        {
            string  rootDir, stateCode, stateName;
            char    gll, glh;
            int     startLat, startLon, width, height;
            int     gnl, gnh;

            stateCode = "id";
            startLat = 42;
            startLon = 111;
            width = 1;
            height = 1;
            gll = 'a';
            glh = 'h';
            gnl = 1;
            gnh = 8;

            rootDir = "/home/kas/maps/maps/geotiff/usgs_24k";
            rootDir = "/media/Expansion Drive/maps/maps/geotiff/usgs_24k";

            foreach (string s in args) {
                if (s.StartsWith("dir=") && s.Length > 4) {
                    rootDir = s.Substring(4);
                }
                else if (s.StartsWith("state=") && s.Length > 6) {
                    stateCode = s.Substring(6);
                }
                else if (s.StartsWith("lat=") && s.Length > 4) {
                    startLat = int.Parse(s.Substring(4));
                }
                else if (s.StartsWith("lon=") && s.Length > 4) {
                    startLon = int.Parse(s.Substring(4));
                }
                else if (s.StartsWith("width=") && s.Length > 6) {
                    width = int.Parse(s.Substring(6));
                }
                else if (s.StartsWith("height=") && s.Length > 7) {
                    height = int.Parse(s.Substring(7));
                }
                else if (s.StartsWith("gnl=") && s.Length > 4) {
                    gnl = int.Parse(s.Substring(4));
                }
                else if (s.StartsWith("gnh=") && s.Length > 4) {
                    gnh = int.Parse(s.Substring(4));
                }
                else if (s.StartsWith("gll=") && s.Length > 4) {
                    gll = char.Parse(s.Substring(4));
                }
                else if (s.StartsWith("glh=") && s.Length > 4) {
                    glh = char.Parse(s.Substring(4));
                }
            }

            Dictionary<string, string> states = new Dictionary<string, string>();
            states.Add("az", "arizona");
            states.Add("ca", "california");
            states.Add("co", "colorado");
            states.Add("ct", "connecticut");
            states.Add("de", "delaware");
            states.Add("hi", "hawaii");
            states.Add("id", "idaho");
            states.Add("md", "maryland");
            states.Add("me", "maine");
            states.Add("mt", "montana");
            states.Add("nd", "north dakota");
            states.Add("nh", "new hampshire");
            states.Add("nj", "new jersey");
            states.Add("nm", "new mexico");
            states.Add("nv", "nevada");
            states.Add("ny", "new york");
            states.Add("or", "oregon");
            states.Add("pa", "pennsylvania");
            states.Add("ri", "rhode island");
            states.Add("sd", "south dakota");
            states.Add("tx", "texas");
            states.Add("ut", "utah");
            states.Add("vt", "vermont");
            states.Add("wa", "washington");
            states.Add("wy", "wyoming");

            if (states.ContainsKey(stateCode))
                stateName = states[stateCode];
            else
                stateName = "unknown";

            System.Console.WriteLine("DIRECTORY : \"" + rootDir + "\"");
            System.Console.WriteLine("STATE     : \"" + stateCode +
                                                  " - " + stateName + "\"");
            System.Console.WriteLine("LATITUDE  : " + startLat);
            System.Console.WriteLine("LONGITUDE : " + startLon);
            System.Console.WriteLine("Blocks    : " + width + " x " + height);
            System.Console.WriteLine("Files     : "  + gll + " - " + glh + 
                                                ", " + gnl + " - " + gnh);
            System.Console.WriteLine("");

            if (!states.ContainsKey(stateCode)) {
                System.Console.WriteLine("Unknown state - terminating\n");
                return(1);
            }

            string localDir = rootDir + "/" + stateCode + " - " + stateName;
            if (!Directory.Exists(localDir)) {
                System.Console.WriteLine("localDir \"" + localDir +
                                         "\" does not exist\n");
                return(1);
            }

            for (int lat = startLat; lat < startLat + height; lat++) {
                for (int lon = startLon; lon < startLon + width; lon++) {
					
                    // a-h, 1-8
                    for (char gridLet = gll; gridLet <= glh; gridLet++) {
                        for (int gridNum = gnl; gridNum <= gnh; gridNum += 1) {
                            if (getUSGS24kFile(localDir, stateCode,
                                              lat, lon, gridLet, gridNum) != 0) {
                                //return(1);
                            }
                        }
                    }
                }
            }

            return(0);
        }

        //
        private static int
        getUSGS24kFile(string localDir, string stateCode,
                       int lat, int lon, char gridLet, int gridNum)
        {
            string tifFile, remoteFile, localFile;
            string latlon, gridRef;

            if (lon >= 100)
                latlon = "" + lat + "" + lon;
            else
                latlon = "" + lat + "0" + lon;
                            							
            gridRef = "" + gridLet + "" + gridNum;
            tifFile = "o" + latlon + "" + gridRef + ".tif";
            localFile = localDir + "/" + tifFile;
            remoteFile = "http://www.archive.org/download/usgs_drg_" +
                      stateCode + "_" + latlon + "_" + gridRef + "/" + tifFile;

            if (File.Exists (localFile)) {
                Console.WriteLine ("File " + localFile + " exists");
            }
            else {
                Console.WriteLine ("Downloading file " + localFile);
                Console.WriteLine ("Remote: " + remoteFile);

                WebClient wc = new WebClient ();
                wc.Proxy = null;
                try {
                    wc.DownloadFile(remoteFile, localFile);
                }
                catch (WebException ex) {
                    if (ex.Status == WebExceptionStatus.NameResolutionFailure) {
                        Console.WriteLine("** - Name Resolution Failure");
                        File.Delete(localFile);
                    }
                    else if (ex.Status == WebExceptionStatus.ProtocolError) {
                        HttpWebResponse response = (HttpWebResponse) ex.Response;
                        Console.WriteLine("  ** - Protocol Error - " + 
                                          (int) response.StatusCode + ": " +
                                          response.StatusDescription);
                    }
                    else {
                        Console.WriteLine(ex);
                        if (File.Exists (localFile))
                            File.Delete(localFile);
                        return(1);
                    }
                }

                try {
                    FileInfo fi = new FileInfo (localFile);
                    if (fi.Exists && fi.Length < 99999) {
                        Console.WriteLine ("Deleting " + localFile);
                        File.Delete(localFile);
                    }
                } 
                catch (Exception ex) {
                    Console.WriteLine(ex);
                    File.Delete(localFile);
                }
            }

            return(0);
        }
    }
}

/******************************************************************************
 *              ( ( (                                                         *
 *               ) ) )                                                        *
 *               ( ( (    -- End of module <usgsdown.cs> --                   *
 *             '. ___ .'                                                      *
 *            '  (> <)  '                                                     *
 *************ooO*(_)*Ooo******************************************************/