var nodegit = require("../");
var path = require("path");

var repo;

function process(commit) {
  "use strict";
  console.log("commit " + commit.sha());
  return commit.getDiff().then(function (diffList) {
    return Promise.all(diffList.map(function (diff) {
      return diff.patches().then(function (patches) {
        return Promise.all(patches.map(function (patch) {
          return patch.hunks().then(function (hunks) {
            return Promise.all(hunks.map(function (hunk) {
              return hunk.lines().then(function (lines) {
                return true;
              });
            }));
          });
        }));
      })
    })).then(function () {
      if(commit.parentcount() === 0) {
        return false;
      } else {
        return repo.getCommit(commit.parentId(0));
      }
    });
  });
}

function iterate(commit) {
  "use strict";

  return process(commit).then(function(childcommit) {
    if(!childcommit) {
      return true;
    } else {
      return iterate(childcommit);
    }
  });
}

// This code examines the diffs between a particular commit and all of its
// parents. Since this commit is not a merge, it only has one parent. This is
// similar to doing `git show`.

nodegit.Repository.open(path.resolve(__dirname, "../.git"))
  .then(function (re) {
    repo = re;
    return repo.getHeadCommit();
  })
  .then(function (commit) {
    return iterate(commit);
  })
  .done(function () {
    "use strict";
    console.log("done");
  })