'use strict';

module.exports = function (myDeps, conf, overrideHttp) {
  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 = conf.content;
  //var server;
  var goldilocksApis;
  var app;
  var request;

  function createGoldilocksApis() {
    var PromiseA = require('bluebird');
    var OAUTH3 = require('../packages/assets/org.oauth3');
    require('../packages/assets/org.oauth3/oauth3.domains.js');
    require('../packages/assets/org.oauth3/oauth3.dns.js');
    require('../packages/assets/org.oauth3/oauth3.tunnel.js');
    OAUTH3._hooks = require('../packages/assets/org.oauth3/oauth3.node.storage.js');

    request = request || PromiseA.promisify(require('request'));

    myDeps.PromiseA = PromiseA;
    myDeps.OAUTH3 = OAUTH3;
    myDeps.recase = require('recase').create({});
    myDeps.request = request;

    return require('../packages/apis/com.daplie.goldilocks').create(myDeps, conf);
  }

  app = express();

  var Sites = {
    add: function (sitesMap, site) {
      if (!sitesMap[site.$id]) {
        sitesMap[site.$id] = site;
      }

      if (!site.paths) {
        site.paths = [];
      }
      if (!site.paths._map) {
        site.paths._map = {};
      }
      site.paths.forEach(function (path) {

        site.paths._map[path.$id] = path;

        if (!path.modules) {
          path.modules = [];
        }
        if (!path.modules._map) {
          path.modules._map = {};
        }
        path.modules.forEach(function (module) {

          path.modules._map[module.$id] = module;
        });
      });
    }
  };

  var opts = overrideHttp || conf.http;
  if (!opts.defaults) {
    opts.defaults = {};
  }
  if (!opts.global) {
    opts.global = {};
  }
  if (!opts.sites) {
    opts.sites = [];
  }
  opts.sites._map = {};
  opts.sites.forEach(function (site) {

    Sites.add(opts.sites._map, site);
  });

  function mapMap(el, i, arr) {
    arr._map[el.$id] = el;
  }
  opts.global.modules._map = {};
  opts.global.modules.forEach(mapMap);
  opts.global.paths._map = {};
  opts.global.paths.forEach(function (path, i, arr) {
    mapMap(path, i, arr);
    //opts.global.paths._map[path.$id] = path;
    path.modules._map = {};
    path.modules.forEach(mapMap);
  });
  opts.sites.forEach(function (site) {
    site.paths._map = {};
    site.paths.forEach(function (path, i, arr) {
      mapMap(path, i, arr);
      //site.paths._map[path.$id] = path;
      path.modules._map = {};
      path.modules.forEach(mapMap);
    });
  });
  opts.defaults.modules._map = {};
  opts.defaults.modules.forEach(mapMap);
  opts.defaults.paths._map = {};
  opts.defaults.paths.forEach(function (path, i, arr) {
    mapMap(path, i, arr);
    //opts.global.paths._map[path.$id] = path;
    path.modules._map = {};
    path.modules.forEach(mapMap);
  });

  function _goldApis(req, res, next) {
    if (!goldilocksApis) {
      goldilocksApis = createGoldilocksApis();
    }

    if (typeof goldilocksApis[req.params.name] === 'function') {
      goldilocksApis[req.params.name](req, res);
    } else {
      next();
    }
  }
  return app
  .use('/api/com.daplie.goldilocks/:name', _goldApis)
  .use('/api/goldilocks@daplie.com/:name', _goldApis)
  .use('/', function (req, res, next) {
    if (!req.headers.host) {
      next(new Error('missing HTTP Host header'));
      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 || null, opts.sites._map[hostname] || null, opts.defaults || null ];
    var loadables = {
      serve: function (config, hostname, pathname, req, res, next) {
        var originalUrl = req.url;
        var dirpaths = config.paths.slice(0);

        function nextServe() {
          var dirname = dirpaths.pop();
          if (!dirname) {
            req.url = originalUrl;
            next();
            return;
          }

          console.log('[serve]', req.url, hostname, pathname, dirname);
          dirname = path.resolve(conf.cwd, dirname.replace(/:hostname/, hostname));
          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) {
        var originalUrl = req.url;
        var dirpaths = config.paths.slice(0);

        function nextIndex() {
          var dirname = dirpaths.pop();
          if (!dirname) {
            req.url = originalUrl;
            next();
            return;
          }

          console.log('[indexes]', req.url, hostname, pathname, dirname);
          dirname = path.resolve(conf.cwd, dirname.replace(/:hostname/, hostname));
          if (!serveStaticMap[dirname]) {
            serveIndexMap[dirname] = serveIndex(dirname);
          }
          serveIndexMap[dirname](req, res, nextIndex);
        }

        req.url = req.url.substr(pathname.length - 1);
        nextIndex();
      }
    , app: function (config, hostname, pathname, req, res, next) {
        //var appfile = path.resolve(/*process.cwd(), */config.path.replace(/:hostname/, hostname));
        var appfile = config.path.replace(/:hostname/, hostname);
        try {
          var app = require(appfile);
          app(req, res, next);
        } catch (err) {
          next();
        }
      }
    };

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

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

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

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

      nextModule();
    }

    function iterPaths(site, hostname, req, res, next) {
      console.log('site', hostname);
      console.log(site);
      var pathnames = Object.keys(site.paths._map);
      console.log('pathnames', pathnames);
      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;
      });
      console.log('pathnames', pathnames);

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

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

      nextPath();
    }

    function nextSite() {
      console.log('hostname', hostname, sites);
      var site;
      if (!sites.length) {
        next(); // 404
        return;
      }
      site = sites.shift();
      if (!site) {
        nextSite();
        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);
    */
  });
};