Git = require 'git'
fs = require 'fs'

describe "Git", ->

  beforeEach ->
    fs.remove('/tmp/.git') if fs.isDirectory('/tmp/.git')

  describe "@open(path)", ->
    it "returns null when no repository is found", ->
      expect(Git.open('/tmp/nogit.txt')).toBeNull()

  describe "new Git(path)", ->
    it "throws an exception when no repository is found", ->
      expect(-> new Git('/tmp/nogit.txt')).toThrow()

  describe ".getPath()", ->
    it "returns the repository path for a .git directory path", ->
      repo = new Git(require.resolve('fixtures/git/master.git/HEAD'))
      expect(repo.getPath()).toBe require.resolve('fixtures/git/master.git') + '/'

    it "returns the repository path for a repository path", ->
      repo = new Git(require.resolve('fixtures/git/master.git'))
      expect(repo.getPath()).toBe require.resolve('fixtures/git/master.git') + '/'

  describe ".getHead()", ->
    it "returns a branch name for a non-empty repository", ->
      repo = new Git(require.resolve('fixtures/git/master.git'))
      expect(repo.getHead()).toBe 'refs/heads/master'

  describe ".getShortHead()", ->
    it "returns a branch name for a non-empty repository", ->
      repo = new Git(require.resolve('fixtures/git/master.git'))
      expect(repo.getShortHead()).toBe 'master'

  describe ".isPathIgnored(path)", ->
    it "returns true for an ignored path", ->
      repo = new Git(require.resolve('fixtures/git/ignore.git'))
      expect(repo.isPathIgnored('a.txt')).toBeTruthy()

    it "returns false for a non-ignored path", ->
      repo = new Git(require.resolve('fixtures/git/ignore.git'))
      expect(repo.isPathIgnored('b.txt')).toBeFalsy()

  describe ".isPathModified(path)", ->
    [repo, path, newPath, originalPathText] = []

    beforeEach ->
      repo = new Git(require.resolve('fixtures/git/working-dir'))
      path = require.resolve('fixtures/git/working-dir/file.txt')
      newPath = fs.join(require.resolve('fixtures/git/working-dir'), 'new-path.txt')
      originalPathText = fs.read(path)

    afterEach ->
      fs.write(path, originalPathText)
      fs.remove(newPath) if fs.exists(newPath)

    describe "when the path is unstaged", ->
      it "returns false if the path has not been modified", ->
        expect(repo.isPathModified(path)).toBeFalsy()

      it "returns true if the path is modified", ->
        fs.write(path, "change")
        expect(repo.isPathModified(path)).toBeTruthy()

      it "returns true if the path is deleted", ->
        fs.remove(path)
        expect(repo.isPathModified(path)).toBeTruthy()

      it "returns false if the path is new", ->
        expect(repo.isPathModified(newPath)).toBeFalsy()

  describe ".isPathNew(path)", ->
    [repo, path, newPath] = []

    beforeEach ->
      repo = new Git(require.resolve('fixtures/git/working-dir'))
      path = require.resolve('fixtures/git/working-dir/file.txt')
      newPath = fs.join(require.resolve('fixtures/git/working-dir'), 'new-path.txt')
      fs.write(newPath, "i'm new here")

    afterEach ->
      fs.remove(newPath) if fs.exists(newPath)

    describe "when the path is unstaged", ->
      it "returns true if the path is new", ->
        expect(repo.isPathNew(newPath)).toBeTruthy()

      it "returns false if the path isn't new", ->
        expect(repo.isPathNew(path)).toBeFalsy()

  describe ".checkoutHead(path)", ->
    [repo, path1, path2, originalPath1Text, originalPath2Text] = []

    beforeEach ->
      repo = new Git(require.resolve('fixtures/git/working-dir'))
      path1 = require.resolve('fixtures/git/working-dir/file.txt')
      originalPath1Text = fs.read(path1)
      path2 = require.resolve('fixtures/git/working-dir/other.txt')
      originalPath2Text = fs.read(path2)

    afterEach ->
      fs.write(path1, originalPath1Text)
      fs.write(path2, originalPath2Text)

    it "no longer reports a path as modified after checkout", ->
      expect(repo.isPathModified(path1)).toBeFalsy()
      fs.write(path1, '')
      expect(repo.isPathModified(path1)).toBeTruthy()
      expect(repo.checkoutHead(path1)).toBeTruthy()
      expect(repo.isPathModified(path1)).toBeFalsy()

    it "restores the contents of the path to the original text", ->
      fs.write(path1, '')
      expect(repo.checkoutHead(path1)).toBeTruthy()
      expect(fs.read(path1)).toBe(originalPath1Text)

    it "only restores the path specified", ->
      fs.write(path2, 'path 2 is edited')
      expect(repo.isPathModified(path2)).toBeTruthy()
      expect(repo.checkoutHead(path1)).toBeTruthy()
      expect(fs.read(path2)).toBe('path 2 is edited')
      expect(repo.isPathModified(path2)).toBeTruthy()

  describe ".destroy()", ->
    it "throws an exception when any method is called after it is called", ->
      repo = new Git(require.resolve('fixtures/git/master.git/HEAD'))
      repo.destroy()
      expect(-> repo.getHead()).toThrow()

  describe ".getDiffStats(path)", ->
    [repo, path, originalPathText] = []

    beforeEach ->
      repo = new Git(require.resolve('fixtures/git/working-dir'))
      path = require.resolve('fixtures/git/working-dir/file.txt')
      originalPathText = fs.read(path)

    afterEach ->
      fs.write(path, originalPathText)

    it "returns the number of lines added and deleted", ->
      expect(repo.getDiffStats(path)).toEqual {added: 0, deleted: 0}
      fs.write(path, "#{originalPathText} edited line")
      expect(repo.getDiffStats(path)).toEqual {added: 1, deleted: 1}