text: /*
   * Copyright 2019 Zane Littrell
   *
   * 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.
   */
  const Login = require("./login");
  
  /*
   * Controller class for the infinite timeline.
   */
  class Issues {
    /*
     * Renders an index page with links to all the issue PDFs.
     */
    static index(req, dynamoDb, callback) {
      const params = {
        TableName: process.env.ISSUE_TABLE
      };
      dynamoDb
        .scan(params)
        .promise()
        .then(data => {
          callback("render", "issues/index", { issues: data.Items });
        })
        .catch(error => {
          console.error(error);
          callback("render", "error", { error: error });
        });
    }
  
    /*
     * Displays the given issue.
     */
    static show(req, dynamoDb, callback) {
      const params = {
        TableName: process.env.ISSUE_TABLE,
        Key: {
          issueId: Number(req.params.issueId)
        }
      };
      dynamoDb
        .get(params)
        .promise()
        .then(data => {
          callback("render", "issues/show", { issue: data.Item });
        })
        .catch(error => {
          console.error(error);
          callback("render", "error", { error: error });
        });
    }
  
    /*
     * Renders a form to create a new issue link.
     * NOTE:
     *   User must be logged in.
     */
    static new_issue(req, dynamoDb, callback) {
      if (Login.authenticate(req)) {
        callback("render", "issues/new");
      } else {
        callback("redirect", "/login");
      }
    }
  
    /*
     * Creates a new issue link in the database. Redirects to the issue index on
     * successful creation.
     * NOTE:
     *   User must be logged in.
     */
    static create(req, dynamoDb, callback) {
      if (Login.authenticate(req)) {
        const params = {
          TableName: process.env.ISSUE_TABLE,
          Item: {
            issueId: Number(req.body.issueId),
            link: req.file.location
          }
        };
        dynamoDb
          .put(params)
          .promise()
          .then(() => {
            callback("redirect", "/issues");
          })
          .catch(error => {
            console.error(error);
            callback("render", "error", { error: error });
          });
      } else {
        callback("redirect", "/login");
      }
    }
  
    /*
     * Renders a page to edit an issue.
     * NOTE:
     *   User must be logged in.
     */
    static edit(req, dynamoDb, callback) {
      if (Login.authenticate(req)) {
        const params = {
          TableName: process.env.ISSUE_TABLE,
          Key: {
            issueId: req.params.issueId
          }
        };
        dynamoDb
          .get(params)
          .promise()
          .then(data => {
            callback("render", "issues/edit", { issue: data.Item });
          })
          .catch(error => {
            console.error(error);
            callback("render", "error", { error: error });
          });
      } else {
        callback("redirect", "/login");
      }
    }
  
    /*
     * Updates the data for the current issue. After successfully
     * updating, the user is redirected to the issue index.
     * NOTE:
     *   User must be logged in.
     */
    static update(req, dynamoDb, callback) {
      if (Login.authenticate(req)) {
        const params = {
          TableName: process.env.ISSUE_TABLE,
          Key: {
            issueId: req.body.issueId
          },
          UpdateExpression: "SET link = :link",
          ExpressionAttributeValues: {
            ":link": req.file.location
          }
        };
        console.log(params);
        dynamoDb
          .update(params)
          .promise()
          .then(() => {
            callback("redirect", "/issues");
          })
          .catch(error => {
            console.error(error);
            callback("render", "error", { error: error });
          });
      } else {
        callback("redirect", "/login");
      }
    }
  
    /*
     * Deletes the given issue and redirects to the issue index.
     * NOTE:
     *   User must be logged in.
     */
    static destroy(req, dynamoDb, callback) {
      if (Login.authenticate(req)) {
        const params = {
          TableName: process.env.ISSUE_TABLE,
          Key: {
            issueId: req.params.issueId
          }
        };
        dynamoDb
          .delete(params)
          .promise()
          .then(() => {
            callback("redirect", "/issues");
          })
          .catch(error => {
            console.error(error);
            callback("render", "error", { error: error });
          });
      } else {
        callback("redirect", "/login");
      }
    }
  }
  module.exports = Issues;
  