module.exports = DiffSummary;

/**
 * The DiffSummary is returned as a response to getting `git().status()`
 *
 * @constructor
 */
function DiffSummary () {
   this.files = [];
   this.insertions = 0;
   this.deletions = 0;
   this.changed = 0;
}

/**
 * Number of lines added
 * @type {number}
 */
DiffSummary.prototype.insertions = 0;

/**
 * Number of lines deleted
 * @type {number}
 */
DiffSummary.prototype.deletions = 0;

/**
 * Number of files changed
 * @type {number}
 */
DiffSummary.prototype.changed = 0;

DiffSummary.parse = function (text) {
   var line, handler;

   var lines = text.trim().split('\n');
   var status = new DiffSummary();

   var summary = lines.pop();
   if (summary) {
      summary.trim().split(', ').forEach(function (text) {
         var summary = /(\d+)\s([a-z]+)/.exec(text);
         if (!summary) {
            return;
         }

         if (/files?/.test(summary[2])) {
            status.changed = parseInt(summary[1], 10);
         }
         else {
            status[summary[2].replace(/s$/, '') + 's'] = parseInt(summary[1], 10);
         }
      });
   }

   while (line = lines.shift()) {
      textFileChange(line, status.files) || binaryFileChange(line, status.files);
   }

   return status;
};

function textFileChange (line, files) {
   line = line.trim().match(/^(.+)\s+\|\s+(\d+)(\s+[+\-]+)?$/);

   if (line) {
      var alterations = (line[3] || '').trim();
      files.push({
         file: line[1].trim(),
         changes: parseInt(line[2], 10),
         insertions: alterations.replace(/-/g, '').length,
         deletions: alterations.replace(/\+/g, '').length,
         binary: false
      });

      return true;
   }
}

function binaryFileChange (line, files) {
   line = line.match(/^(.+) \|\s+Bin ([0-9.]+) -> ([0-9.]+) ([a-z]+)$/);
   if (line) {
      files.push({
         file: line[1].trim(),
         before: +line[2],
         after: +line[3],
         binary: true
      });
      return true;
   }
}