var fs = require('fs-extra');
var http = require('http');
var path = require('path');
var swig = require('swig');

var templates = {};
var bot, sql, cfg, lib;

module.exports = Websrv;
function Websrv(tbot, tsql, tcfg, tlib) {
  this.bot = bot = tbot;
  this.sql = sql = tsql;
  this.cfg = cfg = tcfg;
  this.lib = lib = tlib;
  
  http.createServer((req, res) => {
    if(cfg.wlip.hasOwnProperty(req.connection.remoteAddress)) {
      var filePath = '.' + req.url;
      var url = req.url.split("/")[1];
      if(filePath == './')
        filePath = './index.html';
      var extname = String(path.extname(filePath)).toLowerCase();
      var contentType = 'text/html';
      var mimeTypes = {
        '.html': 'text/html',
        '.js': 'text/javascript',
        '.css': 'text/css',
        '.png': 'image/png',
        '.jpg': 'image/jpg',
        '.gif': 'image/gif',
        '.mp3': 'audio/mpeg',
        '.mp4': 'video/mp4',
        '.webm': 'video/webm',
        '.css': 'text/css',
        '.ogg': 'audio/ogg'
      };
      if(filePath == "./index.html") { // mainpage
        var tpl = swig.compile(templates.index);
        var data = { items: [] };
        sql.query("select `id`,`mime` from `f0ck`.`items` order by `id` desc", (err, rows, fields) => {
          rows.forEach((e,i,a) => {
            data.items.push({ "id": e.id, "mime": e.mime });
          });
          res.writeHead(200, { 'Content-Type': 'text/html' });
          res.end(tpl(data), 'utf-8');
        });
      }
      else if(Number.isInteger(parseInt(url))) { // itempage
        var query = "select * from `f0ck`.`items` where `id` = ? limit 1; " // get item
                  + "select `id` from `f0ck`.`items` where `id` = (select min(`id`) from `f0ck`.`items` where `id` > ?); " // get previous item
                  + "select `id` from `f0ck`.`items` where `id` = (select max(`id`) from `f0ck`.`items` where `id` < ?)"; // get next item
        sql.query(query, [url, url, url], (err, rows, fields) => {
          var tpl = swig.compile(templates.item);
          var data = {
            id: '',
            username: '',
            item: '',
            src: '',
            dest: '',
            mime: '',
            size: '',
            userchannel: '',
            usernetwork: '',
            next: null,
            prev: null
          };
          if(rows[0].length) {
            var e = rows[0][0];
            switch(e.mime) {
              case "image/png":
              case "image/jpeg":
              case "image/gif":
                data.item = 'image';
              break;
              case "video/webm":
              case "video/mp4":
                data.item = 'video';
              break;
              case "audio/mpeg":
              case "audio/ogg":
                data.item = 'audio';
              break;
            }
            data.id = e.id;
            data.username = e.username;
            data.src = e.src;
            data.dest = e.dest;
            data.mime = e.mime;
            data.size = lib.formatSize(e.size);
            data.userchannel = e.userchannel;
            data.usernetwork = e.usernetwork;
            if(rows[1].length)
              data.next = rows[1][0].id;
            if(rows[2].length)
              data.prev = rows[2][0].id;
          }
          res.writeHead(200, { 'Content-Type': 'text/html' });
          res.end(tpl(data), 'utf-8');
        });
      }
      else if(filePath == "./random") {
        sql.query("select `id` from `f0ck`.`items` order by rand() limit 1", (err, rows, fields) => {
          res.writeHead(301, {
            'Cache-Control': 'no-cache, public',
            'Location': '/' + rows[0].id
          });
          res.end();
        });
      }
      else if(filePath == "./how") {
        var tpl = swig.compile(templates.how);
        res.writeHead(200, { 'Content-Type': 'text/html' });
        res.end(tpl(), 'utf-8');
      }
      else if(filePath == "./contact") {
        var tpl = swig.compile(templates.contact);
        res.writeHead(200, { 'Content-Type': 'text/html' });
        res.end(tpl(), 'utf-8');
      }
      else if(filePath == "./scripts") {
        var tpl = swig.compile(templates.scripts);
        res.writeHead(200, { 'Content-Type': 'text/html' });
        res.end(tpl(), 'utf-8');
      }
      else if(filePath.match(/^\.\/(b|s|t)\/.*/)) { // file
        contentType = mimeTypes[extname];
        switch(contentType) {
          case "video/webm":
          case "video/mp4":
          case "audio/mpeg":
          case "audio/ogg":
            var start = 0;
            var end = 0;
            var range = req.headers['range'];
            var stat = fs.statSync(filePath);
            if(range != null) {
              start = parseInt(range.slice(range.indexOf('bytes=')+6, range.indexOf('-')));
              end = parseInt(range.slice(range.indexOf('-')+1, range.length));
            }
            if(isNaN(end) || end == 0) end = stat.size-1;
            if(start > end) return;
            res.writeHead(206, {
              'Connection':'close',
              'Content-Type':contentType,
              'Content-Length':end - start,
              'Content-Range':'bytes '+start+'-'+end+'/'+stat.size,
              'Transfer-Encoding':'chunked'
            });
            var stream = fs.createReadStream(filePath, { flags: 'r', start: start, end: end});
            stream.pipe(res);
          break;
          default:
            fs.readFile(filePath, (error, content) => {
              if(error) {
                if(error.code == 'ENOENT') {
                  res.writeHead(200, { 'Content-Type': contentType });
                  res.end('404 - f0ck you', 'utf-8');
                }
                else {
                  res.writeHead(500);
                  res.end('Sorry, check with the site admin for error: '+error.code+' ..\n');
                  res.end();
                }
              }
              else {
                res.writeHead(200, { 'Content-Type': contentType, 'Content-Length': content.length, 'Cache-Control': 'max-age=2592000, public' });
                res.end(content, 'utf-8');
              }
            });
          break;
        }
        fs.readFile(filePath, (error, content) => {
          if(error) {
            if(error.code == 'ENOENT') {
              res.writeHead(200, { 'Content-Type': contentType });
              res.end('404 - f0ck you', 'utf-8');
            }
            else {
              res.writeHead(500);
              res.end('Sorry, check with the site admin for error: '+error.code+' ..\n');
              res.end();
            }
          }
        });
      }
      else { // errorpage
        res.writeHead(404);
        res.end('404 - f0ck you', 'utf-8');
      }
    }
    else {
      res.writeHead(403);
      res.end('403 - forbidden');
    }
  }).listen(cfg.webserver.port);
}

Websrv.prototype.getTpls = () => {
  templates = {
    "index": fs.readFileSync("./s/index.tpl.html", "utf-8"),
    "item": fs.readFileSync("./s/item.tpl.html", "utf-8"),
    "how": fs.readFileSync("./s/how.tpl.html", "utf-8"),
    "contact": fs.readFileSync("./s/contact.tpl.html", "utf-8"),
    "scripts": fs.readFileSync("./s/scripts.tpl.html", "utf-8")
  };
};