'use strict';

module.exports = function (opts) {
  var express = require('express');
  //var finalhandler = require('finalhandler');
  var serveStatic = require('serve-static');
  var serveIndex = require('serve-index');
  //var assetServer = serveStatic(opts.assetsPath);
  var path = require('path');
  //var wellKnownServer = serveStatic(path.join(opts.assetsPath, 'well-known'));

  var serveStaticMap = {};
  var serveIndexMap = {};
  var content = opts.content;
  //var server;
  var serveInit;
  var app;

  function _reloadWrite(data, enc, cb) {
    /*jshint validthis: true */
    if (this.headersSent) {
      this.__write(data, enc, cb);
      return;
    }

    if (!/html/i.test(this.getHeader('Content-Type'))) {
      this.__write(data, enc, cb);
      return;
    }

    if (this.getHeader('Content-Length')) {
      this.setHeader('Content-Length', this.getHeader('Content-Length') + this.__my_addLen);
    }

    this.__write(this.__my_livereload);
    this.__write(data, enc, cb);
  }


  function createServeInit() {
    var PromiseA = require('bluebird');
    var fs = PromiseA.promisifyAll(require('fs'));
    var ownersPath = path.join(__dirname, '..', 'var', 'owners.json');

    return require('../packages/apis/com.daplie.caddy').create({
      PromiseA: PromiseA
    , storage: {
        owners: {
          all: function () {
            var owners;
            try {
              owners = require(ownersPath);
            } catch(e) {
              owners = {};
            }

            return PromiseA.resolve(Object.keys(owners).map(function (key) {
              var owner = owners[key];
              owner.id = key;
              return owner;
            }));
          }
        , set: function (id, obj) {
            var owners;
            try {
              owners = require(ownersPath);
            } catch(e) {
              owners = {};
            }
            obj.id = id;
            owners[id] = obj;

            return fs.writeFileAsync(ownersPath, JSON.stringify(owners), 'utf8');
          }
        }
      }
    , recase: require('recase').create({})
    , options: opts
    });
  }

  app = express();

  return app.use('/', function (req, res, next) {
    if (!req.headers.host) {
      next(new Error('missing HTTP Host header'));
      return;
    }

    if (0 === req.url.indexOf('/api/com.daplie.caddy/')) {
      if (!serveInit) {
        serveInit = createServeInit();
      }
    }
    if ('/api/com.daplie.caddy/init' === req.url) {
      serveInit.init(req, res);
      return;
    }
    if ('/api/com.daplie.caddy/config' === req.url) {
      serveInit.config(req, res);
      return;
    }

    if (content && '/' === req.url) {
      // res.setHeader('Content-Type', 'application/octet-stream');
      res.end(content);
      return;
    }

    //var done = finalhandler(req, res);
    var host = req.headers.host;
    var hostname = (host||'').split(':')[0].toLowerCase();

    console.log('opts.global', opts.global);
    var sites = [ opts.global || {}, opts.sites[hostname] || {}, opts.defer || {} ];
    var loadables = {
      serve: function (config, hostname, pathname, req, res, next) {
        config = config.slice(0);
        var originalUrl = req.url;

        function nextServe() {
          var dirname = config.pop();
          console.log('[serve]', req.url, hostname, pathname, dirname);
          if (!dirname) {
            req.url = originalUrl;
            next();
            return;
          }

          if (!serveStaticMap[dirname]) {
            serveStaticMap[dirname] = serveStatic(dirname);
          }

          serveStaticMap[dirname](req, res, nextServe);
        }

        req.url = req.url.substr(pathname.length - 1);
        nextServe();
      }
    , indexes: function (config, hostname, pathname, req, res, next) {
        config = config.slice(0);
        var originalUrl = req.url;

        function nextIndex() {
          var dirname = config.pop();
          console.log('[indexes]', req.url, hostname, pathname, dirname);
          if (!dirname) {
            req.url = originalUrl;
            next();
            return;
          }

          if (!serveStaticMap[dirname]) {
            serveIndexMap[dirname] = serveIndex(dirname);
          }
          serveIndexMap[dirname](req, res, nextIndex);
        }

        req.url = req.url.substr(pathname.length - 1);
        nextIndex();
      }
    };

    function runModule(config, hostname, pathname, modulename, req, res, next) {
      if (!loadables[modulename]) {
        next(new Error("no module '" + modulename + "' found"));
        return;
      }
      loadables[modulename](config, hostname, pathname, req, res, next);
    }

    function iterModules(modules, hostname, pathname, req, res, next) {
      var modulenames = Object.keys(modules);

      function nextModule() {
        var modulename = modulenames.pop();
        if (!modulename) {
          next();
          return;
        }

        console.log('modules', modules);
        runModule(modules[modulename], hostname, pathname, modulename, req, res, nextModule);
      }

      nextModule();
    }

    function iterPaths(site, hostname, req, res, next) {
      var pathnames = Object.keys(site.paths || {});
      pathnames = pathnames.filter(function (pathname) {
        // TODO ensure that pathname has trailing /
        return (0 === req.url.indexOf(pathname));
        //return req.url.match(pathname);
      });
      pathnames.sort(function (a, b) {
        return b.length - a.length;
      });

      function nextPath() {
        var pathname = pathnames.pop();
        if (!pathname) {
          next();
          return;
        }

        console.log('iterPaths', hostname, pathname, req.url);
        iterModules(site.paths[pathname], hostname, pathname, req, res, nextPath);
      }

      nextPath();
    }

    function nextSite() {
      var site = sites.pop();
      if (!site) {
        next(); // 404
        return;
      }
      iterPaths(site, hostname, req, res, nextSite);
    }

    nextSite();

    /*
    function serveStaticly(server) {
      function serveTheStatic() {
        server.serve(req, res, function (err) {
          if (err) { return done(err); }
          server.index(req, res, function (err) {
            if (err) { return done(err); }
            req.url = req.url.replace(/\/assets/, '');
            assetServer(req, res, function  () {
              if (err) { return done(err); }
              req.url = req.url.replace(/\/\.well-known/, '');
              wellKnownServer(req, res, done);
            });
          });
        });
      }

      if (server.expressApp) {
        server.expressApp(req, res, serveTheStatic);
        return;
      }

      serveTheStatic();
    }

    if (opts.livereload) {
      res.__my_livereload = '<script src="//'
        + (host || opts.sites[0].name).split(':')[0]
        + ':35729/livereload.js?snipver=1"></script>';
      res.__my_addLen = res.__my_livereload.length;

      // TODO modify prototype instead of each instance?
      res.__write = res.write;
      res.write = _reloadWrite;
    }

    console.log('hostname:', hostname, opts.sites[0].paths);

    addServer(hostname);
    server = hostsMap[hostname] || hostsMap[opts.sites[0].name];
    serveStaticly(server);
    */
  });
};