'use strict';

////////////////////////////////////////////////////////////////////////////////
/// @brief Foxx BaseMiddleware
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2013 triagens GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is triAGENS GmbH, Cologne, Germany
///
/// @author Lucas Dohmen
/// @author Copyright 2013, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

const mimeTypes = require('mime-types');

////////////////////////////////////////////////////////////////////////////////
/// JSF_foxx_BaseMiddleware_initializer
/// @brief The Base Middleware
///
/// The `BaseMiddleware` manipulates the request and response
/// objects to give you a nicer API.
////////////////////////////////////////////////////////////////////////////////

function BaseMiddleware() {
  var middleware = function (request, response, options, next) {
    var responseFunctions,
      requestFunctions,
      trace,
      _ = require("lodash"),
      console = require("console"),
      crypto = require("@arangodb/crypto"),
      actions = require("@arangodb/actions"),
      internal = require("internal"),
      fs = require("fs");

    requestFunctions = {

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_request_cookie
////////////////////////////////////////////////////////////////////////////////

      cookie: function (name, cfg) {
        if (!cfg || typeof cfg !== 'object') {
          cfg = {};
        }
        var value = this.cookies[name] || undefined;
        if (value && cfg.signed) {
          if (typeof cfg.signed === 'string') {
            cfg.signed = {secret: cfg.signed};
          }
          var valid = crypto.constantEquals(
            this.cookies[name + '.sig'] || '',
            crypto.hmac(cfg.signed.secret, value, cfg.signed.algorithm)
          );
          if (!valid) {
            value = undefined;
          }
        }
        return value;
      },

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_request_body
////////////////////////////////////////////////////////////////////////////////

      body: function () {
        var requestBody = this.requestBody || '{}';
        return JSON.parse(requestBody);
      },

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_request_rawBody
////////////////////////////////////////////////////////////////////////////////

      rawBody: function () {
        return this.requestBody;
      },

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_request_rawBodyBuffer
////////////////////////////////////////////////////////////////////////////////

      rawBodyBuffer: function () {
        return internal.rawRequestBody(this);
      },

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_request_requestParts
////////////////////////////////////////////////////////////////////////////////

      requestParts: function () {
        return internal.requestParts(this);
      },

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_request_params
////////////////////////////////////////////////////////////////////////////////

      params: function (key) {
        if (this.parameters && this.parameters.hasOwnProperty(key)) {
          return this.parameters[key];
        }
        return this.urlParameters && this.urlParameters[key];
      }
    };

    responseFunctions = {

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_response_cookie
////////////////////////////////////////////////////////////////////////////////

      cookie: function (name, value, cfg) {
        if (!cfg || typeof cfg !== 'object') {
          cfg = {ttl: cfg};
        }
        var ttl = (typeof cfg.ttl === 'number' && cfg.ttl !== Infinity) ? cfg.ttl : undefined;
        actions.addCookie(this, name, value, ttl, cfg.path, cfg.domain, cfg.secure, cfg.httpOnly);
        if (cfg.signed) {
          if (typeof cfg.signed === 'string') {
            cfg.signed = {secret: cfg.signed};
          }
          var sig = crypto.hmac(cfg.signed.secret, value, cfg.signed.algorithm);
          actions.addCookie(this, name + '.sig', sig, ttl, cfg.path, cfg.domain, cfg.secure, cfg.httpOnly);
        }
      },

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_response_status
////////////////////////////////////////////////////////////////////////////////

      status: function (code) {
        this.responseCode = code;
      },

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_response_set
////////////////////////////////////////////////////////////////////////////////

      set: function (key, value) {
        var attributes = {};
        if (_.isUndefined(value)) {
          attributes = key;
        } else {
          attributes[key] = value;
        }

        _.each(attributes, function (value, key) {
          key = key.toLowerCase();
          this.headers = this.headers || {};
          this.headers[key] = value;

          if (key === "content-type") {
            this.contentType = value;
          }
        }, this);
      },

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_response_json
////////////////////////////////////////////////////////////////////////////////

      json: function (obj) {
        this.contentType = "application/json";
        this.body = JSON.stringify(obj);
      },

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_response_send
////////////////////////////////////////////////////////////////////////////////

      send: function (obj) {
        if (obj instanceof Buffer) {
          // Buffer
          if (! this.contentType) {
            this.contentType = "application/octet-stream";
          }
          // fallthrough
        }
        else if (obj !== null && typeof obj === 'object' && ! Array.isArray(obj)) {
          // JSON body, treat regularly
          this.json(obj);
          return;
        }
        else if (typeof obj === 'string') {
          // string
          if (! this.contentType) {
            this.contentType = "text/html";
          }
        }

        this.body = obj;
      },

////////////////////////////////////////////////////////////////////////////////
/// @brief was docuBlock JSF_foxx_BaseMiddleware_response_sendFile
////////////////////////////////////////////////////////////////////////////////

      sendFile: function (filename, options) {
        options = options || { };

        this.body = fs.readBuffer(filename);
        if (options.lastModified) {
          this.set("Last-Modified", new Date(fs.mtime(filename) * 1000).toUTCString());
        }

        if (! this.contentType) {
          this.contentType = mimeTypes.lookup(filename) || 'application/octet-stream';
        }
      }
    };

////////////////////////////////////////////////////////////////////////////////
/// JSF_foxx_BaseMiddleware_response_trace
/// @brief trace
////////////////////////////////////////////////////////////////////////////////

    trace = options.isDevelopment;
    if (!trace && options.hasOwnProperty("options")) {
      trace = options.options.trace;
    }

    if (trace) {
      console.log("%s, incoming request from %s: %s",
                  options.mount,
                  request.client.address,
                  actions.stringifyRequest(request));
    }

    _.extend(request, requestFunctions);
    _.extend(response, responseFunctions);

    next();

    if (trace) {
      if (response.hasOwnProperty("body")) {
        var bodyLength = 0;
        if (response.body !== undefined) {
          if (typeof response.body === "string") {
            bodyLength = parseInt(response.body.length, 10);
          } else {
            try {
              bodyLength = String(response.body).length;
            } catch (err) {
              // ignore if this fails
            }
          }
        }
        console.log("%s, outgoing response with status %s of type %s, body length: %d",
                    options.mount,
                    response.responseCode || 200,
                    response.contentType,
                    bodyLength);
      } else if (response.hasOwnProperty("bodyFromFile")) {
        console.log("%s, outgoing response with status %s of type %s, body file: %s",
                    options.mount,
                    response.responseCode || 200,
                    response.contentType,
                    response.bodyFromFile);
      } else {
        console.log("%s, outgoing response with status %s of type %s, no body",
                    options.mount,
                    response.responseCode || 200,
                    response.contentType);
      }
    }
  };

  return {
    functionRepresentation: middleware
  };
}

exports.BaseMiddleware = BaseMiddleware;