var gulp = require('gulp');
var gulp = require('gulp');
var notify = require("gulp-notify");
var intercept = require('gulp-intercept');
var lastErrorTime = null;                                // Last Error Log time
var myRegx = /\[(.*?)\] \[(.*?)\] \[(.*?)\] \[(.*?)\]/i; // Regex to retrive error
var logPath = "/var/log/apache2/error.log";              // Path To Error log file

gulp.task('default', ['watch']);

gulp.task('watch', function() {

  gulp.watch([logPath]).on('change', function(file) {
    gulp.src([file.path])
        .pipe(intercept(function(fileScaned){
          var errorLines = fileScaned.contents.toString().split('\n'),
            errorTempLines = [],
            displayLines = [],
            lastDisplayLines = 1;

          for (var i = 0; i < errorLines.length; i++) {
            if(errorLines[i].indexOf("PHP Fatal error:") > -1){
              errorTempLines.push(errorLines[i]);
            } else if(errorLines[i].indexOf("PHP Parse error:") > -1) {
              errorTempLines.push(errorLines[i]);
            }
          };

          if(errorTempLines.length <= lastDisplayLines){
            displayLines = errorTempLines;
          } else {
            for (var i = 0; i < lastDisplayLines; i++) {
              var error = errorTempLines[errorTempLines.length - lastDisplayLines - i];

              if(error.indexOf("PHP Fatal error:") > -1){
                errorArray = error.split("PHP Fatal error:");
              } else if(error.indexOf("PHP Parse error:") > -1) {
                errorArray = error.split("PHP Parse error:");
              }

              var errorTime = myRegx.exec(errorArray[0])[1],
                errorMsg = errorArray[1];

              if(lastErrorTime != errorTime){
                displayLines.push(errorMsg);
                
                lastErrorTime = errorTime;
              }
            };
          }

          if(displayLines.length){
            gulp.src(file.path).pipe(notify("Time: "+lastErrorTime+"\n "+ displayLines.join("\n\n")));
          }
        }));
    })
});