// Copyright (C) 2015 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

'use strict';

// Polymer makes `app` intrinsically defined on the window by virtue of the
// custom element having the id "app", but it is made explicit here.
var app = document.querySelector('#app');

window.addEventListener('WebComponentsReady', function() {
  // Middleware
  page(function(ctx, next) {
    document.body.scrollTop = 0;
    next();
  });

  function loadUser(ctx, next) {
    app.accountReady.then(function() {
      next();
    });
  }

  // Routes.
  page('/', loadUser, function(data) {
    // For backward compatibility with GWT links.
    if (data.hash) {
      page.redirect(data.hash);
      return;
    }
    if (app.loggedIn) {
      page.redirect('/dashboard/self');
    } else {
      page.redirect('/q/status:open');
    }
  });

  page('/dashboard/(.*)', loadUser, function(data) {
    if (app.loggedIn) {
      data.params.view = 'gr-dashboard-view';
      app.params = data.params;
    } else {
      page.redirect('/login/' + encodeURIComponent(data.canonicalPath));
    }
  });

  function queryHandler(data) {
    data.params.view = 'gr-change-list-view';
    app.params = data.params;
  }

  page('/q/:query,:offset', queryHandler);
  page('/q/:query', queryHandler);

  page(/^\/(\d+)\/?/, function(ctx) {
    page.redirect('/c/' + ctx.params[0]);
  });

  page('/c/:changeNum/:patchNum?', function(data) {
    data.params.view = 'gr-change-view';
    app.params = data.params;
  });

  page(/^\/c\/(\d+)\/((\d+)(\.\.(\d+))?)\/(.+)/, function(ctx) {
    var params = {
      changeNum: ctx.params[0],
      basePatchNum: ctx.params[2],
      patchNum: ctx.params[4],
      path: ctx.params[5],
      view: 'gr-diff-view',
    };
    // Don't allow diffing the same patch number against itself because WHY?
    if (params.basePatchNum == params.patchNum) {
      page.redirect('/c/' + params.changeNum + '/' + params.patchNum + '/' +
          params.path);
      return;
    }
    if (!params.patchNum) {
      params.patchNum = params.basePatchNum;
      delete(params.basePatchNum);
    }
    app.params = params;
  });

  page.start();
});