# All files / csv2json/libs/core workerMgr.js

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     module.exports = workerMgr;
    var eom = "\x03";
    var eom1 = "\x0e";
    var eom2 = "\x0f";
    var CSVError = require('./CSVError');
    function workerMgr() {
      var spawn = require("child_process").spawn;
      var exports = {
        initWorker: initWorker,
        sendWorker: sendWorker,
        setParams: setParams,
        drain: function(){},
        isRunning: isRunning,
        destroyWorker: destroyWorker
      };
      var workers = [];
      var running = 0;
      var waiting = null;
      function initWorker(num, params) {
        workers = [];
        running = 0;
        waiting = null;
        for (var i = 0; i < num; i++) {
          workers.push(new Worker(params));
        }

      }
      function isRunning() {
        return running > 0;
      }
      function destroyWorker() {
        workers.forEach(function(w) {
          w.destroy();
        });
      }

      function sendWorker(data, startIdx, transformCb, cbResult) {
        if (workers.length > 0) {
          var worker = workers.shift();
          running++;
          worker.parse(data, startIdx, function(result) {
            // var arr=JSON.parse(result);
            // arr.forEach(function(item){
            //   console.log('idx',item.index)
            // })
            workers.push(worker);
            cbResult(result, startIdx);
            running--;
            if (waiting === null && running === 0) {
              exports.drain();
            } else if (waiting) {
              sendWorker.apply(this, waiting);
              waiting = null;
            }
          });
          process.nextTick(transformCb);
        } else {
          waiting = [data, startIdx, transformCb, cbResult];
        }
      }

      function setParams(params) {
        workers.forEach(function(w) {
          w.setParams(params);
        });
      }
      return exports;
    }

    function Worker(params) {
      var spawn = require("child_process").spawn;
      this.cp = spawn(process.execPath, [__dirname + "/worker.js"], {
        env: {
          child:true
        },
        stdio:['pipe', 'pipe', 2, 'ipc']
        // stdio:[0,1,2,'ipc']
      });
      this.setParams(params);
      this.cp.on("message", this.onChildMsg.bind(this));
      this.buffer = "";
      var self = this;
      this.cp.stdout.on("data", function(d) {
        var str = d.toString("utf8");
        var all = self.buffer + str;
        var cmdArr = all.split(eom);
        while (cmdArr.length > 1) {
          self.onChildMsg(cmdArr.shift());
        }
        self.buffer = cmdArr[0];
      });
    }

    Worker.prototype.setParams = function(params) {
      var msg = "0" + JSON.stringify(params);
      this.sendMsg(msg);
    };

    /**
     * msg is like:
     * <cmd><data>
     * cmd is from 0-9
     */
    Worker.prototype.onChildMsg = function(msg) {
      if (msg) {
        var cmd = msg[0];
        var data = msg.substr(1);
        switch (cmd) {
          case "0": //total line number of current chunk
            if (this.cbLine) {
              var sp = data.split("|");
              var len = parseInt(sp[0]);
              var partial = sp[1];
              this.cbLine(len, partial);
            }
            break;
          case "1": // json array of current chunk
            if (this.cbResult) {
              var rows = data.split(eom1);
              rows.pop();
              var res = [];
              rows.forEach(function(row) {
                var sp = row.split(eom2);
                res.push({
                  index: sp[0],
                  row: sp[1],
                  err: sp[2] ? CSVError.fromArray(JSON.parse(sp[2])) : null,
                  json: sp[3]
                });
              });
              this.cbResult(res);
            }
            break;
        }
      }
    };

    Worker.prototype.parse = function(data, startIdx, cbResult) {
      this.cbResult = cbResult;
      var msg = "1" + startIdx + "|" + data;
      this.sendMsg(msg);
    };

    Worker.prototype.destroy = function() {
      this.cp.kill();
    };

    Worker.prototype.sendMsg = function(msg) {
      this.cp.stdin.write(msg + eom, "utf8");
      // this.cp.send(msg)
    };