module.exports = CommitSummary;

function CommitSummary () {
   this.branch = '';
   this.commit = '';
   this.summary = {
      changes: 0,
      insertions: 0,
      deletions: 0
   };
   this.author = null;
}

var COMMIT_BRANCH_MESSAGE_REGEX = /\[([^\s]+) ([^\]]+)/;
var COMMIT_AUTHOR_MESSAGE_REGEX = /\s*Author:\s(.+)/i;

function setBranchFromCommit (commitSummary, commitData) {
   if (commitData) {
      commitSummary.branch = commitData[1];
      commitSummary.commit = commitData[2];
   }
}

function setSummaryFromCommit (commitSummary, commitData) {
   if (commitSummary.branch && commitData) {
      commitSummary.summary.changes = commitData[1] || 0;
      commitSummary.summary.insertions = commitData[2] || 0;
      commitSummary.summary.deletions = commitData[3] || 0;
   }
}

function setAuthorFromCommit (commitSummary, commitData) {
   var parts = commitData[1].split('<');
   var email = parts.pop();

   if (email.indexOf('@') <= 0) {
      return;
   }

   commitSummary.author = {
      email: email.substr(0, email.length - 1),
      name: parts.join('<').trim()
   };
}

CommitSummary.parse = function (commit) {
   var lines = commit.trim().split('\n');
   var commitSummary = new CommitSummary();

   setBranchFromCommit(commitSummary, COMMIT_BRANCH_MESSAGE_REGEX.exec(lines.shift()));

   if (COMMIT_AUTHOR_MESSAGE_REGEX.test(lines[0])) {
      setAuthorFromCommit(commitSummary, COMMIT_AUTHOR_MESSAGE_REGEX.exec(lines.shift()));
   }

   setSummaryFromCommit(commitSummary, /(\d+)[^,]*(?:,\s*(\d+)[^,]*)?(?:,\s*(\d+))?/g.exec(lines.shift()));

   return commitSummary;
};