const Talkgroup = require("../models/talkgroup");
const System = require("../models/system");
const fs = require('fs-extra');

const crypto = require("crypto");
var parse = require('csv-parse');

exports.isLoggedIn = function(req, res, next) {
  if (req.isAuthenticated()) return next();
  res.redirect(account_server + "/login");
};

//router.get("/tg_export/:shortName", isLoggedIn, function(req, res) {
exports.exportTalkgroups = function(req, res, next) {
  process.nextTick(function() {
    System.findOne(
      {
        shortName: req.params.shortName.toLowerCase()
      },
      function(err, system) {
        if (err) {
          console.error(err);
          res.json({ success: false, message: err });
          return;
        }
        if (!system) {
          console.error(err);
          res.json({
            success: false,
            message: "That Short Name does not exist."
          });
          return;
        }
        if (!system.userId.equals(req.user._id)) {
          res.json({
            success: false,
            message: "You are not the user associated with this system."
          });
          return;
        }
        Talkgroup.find(
          {
            shortName: req.params.shortName.toLowerCase()
          },
          function(err, talkgroups) {
            if (err) {
              console.error(err);
              res.json({ success: false, message: err });
              return;
            }
            if (!talkgroups || !Array.isArray(talkgroups)) {
              console.error(err);
              res.json({
                success: false,
                message: "Talkgroups were not found."
              });
              return;
            }
            res.statusCode = 200;
            res.setHeader("Content-Type", "text/csv");
            talkgroups.forEach(function(item) {
              /*  res.write('"' + item.num + '", "'
                              + item.mode + '", "'
                              + item.alpha + '", "'
                              + item.description + '", "'
                              + item.tag + '", "'
                              + item.group + '", "'
                              + item.priority+ '"\r\n');*/
              if (item) {
                var sending = "";
                sending = item.num + ", ";
                if (item.mode) {
                  sending = sending + item.mode.toString().replace(/\,/g, "") + ", "; 
                } else {
                  sending = sending + " ,";
                }
                if (item.alpa) {
                  sending = sending + item.alpha.toString().replace(/\,/g, "") + ", "; 
                } else {
                  sending = sending + " ,";
                }
                if (item.description) {
                  sending = sending + item.description.toString().replace(/\,/g, "") + ", "; 
                } else {
                  sending = sending + " ,";
                }
                if (item.tag) {
                  sending = sending + item.tag.toString().replace(/\,/g, "") + ", "; 
                } else {
                  sending = sending + " ,";
                }
                if (item.group) {
                  sending = sending + item.group.toString().replace(/\,/g, "") + ", "; 
                } else {
                  sending = sending + " ,";
                }
                if (item.priority) {
                  sending = sending + item.priority.toString().replace(/\,/g, "") + "\r\n"; 
                } else {
                  sending = sending + "\r\n";
                }
                res.write(sending);
                  
              }
            });

            res.end();
          }
        );
      }
    );
  });
};

function csv_import(shortName, filename, callback) {
  var talkgroups = [];
  Talkgroup.remove(
    {
      shortName: shortName
    },
    function(err) {
      if (err) {
        console.error("Error: csv import: " + err);
        callback(err, null);
      } else {
        var parser = parse(
          {
            columns: [
              "num",
              "mode",
              "alpha",
              "description",
              "tag",
              "group",
              "priority"
            ]
          },
          async function(err, data) {
            if (err) {
              console.error("Error: csv import 2: " + err);
              callback(err, null);
            } else {
              var response = [];
              for (var i = 0; i < data.length; i++) {
                var row = data[i];
                row.num = parseInt(row.num);
                row.tag = row.tag.toLowerCase();
                row.group = row.group.toLowerCase();
                var newTg = new Talkgroup();
                newTg.num = row.num;
                newTg.alpha = row.alpha;
                newTg.mode = row.mode;
                newTg.description = row.description;
                newTg.tag = row.tag;
                newTg.group = row.group;
                newTg.priority = row.priority;
                newTg.shortName = shortName;
                
                await newTg.save(function(err) {
                  if (err) {
                    console.log("Error: CSV import: " + err);
                    callback(err, null);
                  }
                });

                response.push(row);
              }
              callback(null, response);
            }
          }
        );
        }
        fs.createReadStream(filename).pipe(parser);
      // removed!
    }
  );
}

//router.post("/tg_import/:shortName", isLoggedIn, upload.single('file'), function(req, res, next) {
exports.importTalkgroups = function(req, res, next) {
  process.nextTick(function() {
    System.findOne(
      {
        shortName: req.params.shortName.toLowerCase()
      },
      function(err, system) {
        if (err) {
          console.error("Error - importTalkgroups: " + err);
          res.json({ success: false, message: err });
          return;
        }
        if (!system) {
          console.error("Error - importTalkgroups: System not found - " + req.params.shortName.toLowerCase());
          res.json({
            success: false,
            message: "That Short Name does not exist."
          });
          return;
        }
        if (!system.userId.equals(req.user._id)) {
          console.error("Error - importTalkgroups: you are not the user for hte system: " + req.user._id);
          res.json({
            success: false,
            message: "You are not the user associated with this system."
          });
          return;
        }
        if (!req.file || req.file.size === 0) {
          res.json({ success: false, message: "Please select a file." });
          return;
        }

        fs.exists(req.file.path, function(exists) {
          if (exists) {
            csv_import(system.shortName, req.file.path, function(err, data) {
              if (err) {
                console.error("Erorr - CSV import, callback: " + err);
                res.json({ success: false, message: err });
                res.end();
                return;
              } else {
                res.json({ success: true, talkgroups: data });
                return;
              }
            });
          } else {
            console.error("Error - importTalkgroups: no file");
            res.end(
              "Well, there is no magic for those who don’t believe in it!"
            );
          }
        });
      }
    );
  });
};

// -------------------------------------------

exports.fetchTalkgroups = function(req, res, next) {
  Talkgroup.find(
    {
      shortName: req.params.shortName.toLowerCase()
    },
    function(err, talkgroups) {
      if (err) {
        console.error(err);
        res.json({ success: false, message: err });
        return;
      }
      res.json({ success: true, talkgroups: talkgroups });
      return;
    }
  );
};