#!/usr/bin/env node

// Command line tool for CartoDB SQL API
//
// https://github.com/Vizzuality/CartoDB-SQL-API
//

var http = require('http');

var nodevers = process.versions.node.split('.');

// NOTE: readline is also available in 0.4 but doesn't work
var hasReadline = parseInt(nodevers[0]) > 0 || parseInt(nodevers[1]) >= 8;
//console.log('Node version ' + nodevers.join(',') + ( hasReadline ? ' has' : ' does not have' ) + ' readline support');

var readline = hasReadline ? require('readline') : null;
var tty = require('tty');

var me = process.argv[1];

process.argv.shift(); // this will be "node" (argv[0])
process.argv.shift(); // this will be "benchmark.js" (argv[1])

var batch_mode = false;
var format = 'json';
var username = 'dev';
var domain = 'localhost';
var port = 8080;
var api_version = 2;
var api_key = process.env['CDBSQL_APIKEY'];
var sql;
var decimal_places;
var echo_queries = false;
var skipfields;
var verbose = 0;

function usage(exit_code) {
  console.log("Usage: " + me + " [OPTIONS] <query>");
  if ( hasReadline ) {
    console.log("       " + me + " [OPTIONS]");
  }
  console.log("Options:");
  console.log(" -v                      verbose operations (off)");
  console.log(" --help                  print this help");
  console.log(" --user <string>         cartodb username (" + username + ")");
  console.log(" --domain <string>       service domain (" + domain + ")");
  console.log(" --port <num>            service tcp port number (" + port + ")");
  console.log(" --api-version <num>     API version (" + api_version +")");
  console.log(" --key <string>          API authentication key (CDBSQL_APIKEY)");
  console.log(" --format <string>       Response format (json)");
  console.log(" --dp <num>              Decimal places in geojson format (unspecified)");
  console.log(" --skipfields <string>   Comma-separated list of fields to skip (none)");
  console.log(" --echo-queries          echo commands sent to server");
  if ( hasReadline ) {
  console.log(" --batch                 Send all read queries at once (off)");
  }
  process.exit(exit_code);
}

var arg;
while ( arg = process.argv.shift() ) {
  if ( arg == '-v' ) {
    ++verbose;
  }
  else if ( arg == '--help' ) {
    usage(0);
  }
  else if ( arg == '--key' ) {
    api_key = process.argv.shift();
  }
  else if ( arg == '--domain' ) {
    domain = process.argv.shift();
  }
  else if ( arg == '--user' ) {
    username = process.argv.shift();
  }
  else if ( arg == '--port' ) {
    port = process.argv.shift();
  }
  else if ( arg == '--api-version' ) {
    api_version = process.argv.shift();
  }
  else if ( arg == '--format' ) {
    format = process.argv.shift();
  }
  else if ( arg == '--dp' ) {
    decimal_places = process.argv.shift();
  }
  else if ( arg == '--batch' ) {
    batch_mode = true;
  }
  else if ( arg == '--skipfields' ) {
    skipfields = process.argv.shift();
  }
  else if ( arg == '--echo-queries' ) {
    echo_queries = true;
  }
  else if ( ! sql ) {
    sql = arg;
  }
  else {
    usage(1);
  }
}

var hostname = username + '.' + domain;

if ( ! tty.isatty(process.stdin) || ! tty.isatty(process.stdout) ) {
  batch_mode = true;
}

if ( ! sql ) {

  if ( ! batch_mode ) {

    if ( readline ) {

      var rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
      });

      rl.setPrompt(hostname + '> ');
      rl.prompt();

      sql = '';
      rl.on('line', function(line) {
        sql += line;
        // TODO: some sanity checking, like trim the line or check if it ends with semicolon
        if ( sql.length ) {
          processQuery(sql, function() {
            sql = '';
            rl.prompt();
          });
        } else rl.prompt();
      }).on('close', function() {
        if ( sql.length ) {
          console.warn("Unprocessed sql left: [" + sql + "]");
        }
        console.log("Good bye");
      }).on('SIGCONT', function() {
        // this is needed so not to exit on stop/resume
        rl.prompt();
      });
    } else {
      usage(1);
    }
  } else { // batch mode
    process.stdin.resume();
    process.stdin.setEncoding('utf8');
    sql = '';
    process.stdin.on('data', function(chunk) {
      // TODO: some sanity checking, like trim the line or check if it ends with semicolon
      processQuery(chunk);
    });
  }
} else {
  processQuery(sql);
}

// -- Perform the request

function processQuery(sql, callback)
{

  var post_data = 'q=' + encodeURIComponent(sql);

  var opt = {
    host: hostname,
    port: port,
    path: '/api/v' + api_version + '/sql?format=' + encodeURIComponent(format),
    method: 'POST',
    headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
          'Content-Length': post_data.length
    }
  };

  if ( api_key ) opt.path += '&api_key=' + api_key;
  if ( typeof(decimal_places) != 'undefined' ) opt.path += '&dp=' + decimal_places;
  if ( typeof(skipfields) != 'undefined' ) opt.path += '&skipfields=' + encodeURIComponent(skipfields);

  var body = '';
  var request = 'http://' + opt.host + ':' + opt.port + opt.path;
  if ( verbose ) {
    console.log("Posting " + post_data + " to ", request);
  }

  var req = http.request(opt, function(res) {
    //console.log("Response status: " + res.statusCode);
    res.on('data', function(chunk) {
      body += chunk;
      //console.log("data: "); console.dir(json);
    });

    res.on('end', function() {
      console.log("Request:", request);
      var sqlprint = sql.length > 100 ? sql.substring(0, 100) + ' ... [truncated ' + (sql.length-100) + ' bytes]' : sql;
      sqlprint = sqlprint.split('\n').join(' ');
      if ( echo_queries ) console.log("Query:", sqlprint);
      console.log("Response status: " + res.statusCode);
      console.log('Response body:');
      console.dir(body);
      if ( callback ) callback();
    });

  }).on('error', function(e) {
    console.log("Request:", request);
    console.log("Error: " + e.message);
    if ( callback ) callback();
  });

  req.write(post_data);
  req.end();

}