# The MIT License
# Copyright © 2009 Magnus Bergmark
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# THE SOFTWARE.

require File.dirname(__FILE__) + '/../spec_helper'

describe GitRemoteMonitor::GitWrapper do
  
  before(:all) do
    # Shortcut :-D
    @wrapper = GitRemoteMonitor::GitWrapper
  end
  
  describe "system calls" do
    
    describe "to fetch" do
      it "should raise error if git gets an error" do
        lambda {
          $?.stub!(:success? => false)
          @wrapper.stub!(:`)
          @wrapper.send(:call_fetch)
        }.should raise_error
      end
      
      it "should return output" do
        $?.stub!(:success? => true)
        @wrapper.should_receive(:`).with(/git fetch/).and_return("Downloading stuff...")
        @wrapper.send(:call_fetch).should == "Downloading stuff..."
      end
    end
    
    it "should call git branch correctly" do
      @wrapper.should_receive(:`).with(/git branch/).and_return("Output")
      @wrapper.send(:call_get_local_branch).should == "Output"
    end
    
    it "should call remote listing correctly" do
      @wrapper.should_receive(:`).with(/git branch -r/).and_return("output")
      @wrapper.send(:call_remotes_list).should == "output"
    end
    
    it "should call command to discover git repo correctly and return exit status" do
      # We test a "impossible" value here as a shortcut. If the method returns this, we know the status is returned unchanged
      status = mock("Exit status")
      $?.stub!(:success? => status)
      
      @wrapper.should_receive(:`).with(/git show-ref/).and_return("")
      
      @wrapper.send(:call_repo_discovery).should == status
    end
    
    it "should call git config correctly to get remote branch" do
      @wrapper.should_receive(:`).with(/git config branch\.foobar\.remote/).and_return("Output")
      @wrapper.send(:call_get_remote, "foobar").should == "Output"
    end
    
    it "should call git rev-list correctly to get tracking information" do
      # This is a complex one... :-(
      # Hard to test this without a copy-paste
      @wrapper.should_receive(:`).
          with("git rev-list --left-right foo...bar | cut -c 1 | sort | uniq -c").
          and_return("Output")
      @wrapper.send(:call_get_tracking_info, "foo", "bar").should == "Output"
    end
    
  end
  
  describe "discovering remote branches" do
    it "should return number of remotes when some are defined" do
      @wrapper.should_receive(:call_remotes_list).and_return("  origin/master\n  friend/cool-branch\n")
      @wrapper.has_remotes?.should == 2
    end
    
    it "should return nil when no remotes are defined" do
      @wrapper.should_receive(:call_remotes_list).and_return("\n")
      @wrapper.has_remotes?.should be_nil
    end
  end
  
  describe "discovering git repo" do
    it "should return true if inside repository" do
      @wrapper.stub!(:call_repo_discovery => true)
      @wrapper.in_repo?.should be_true
    end
    it "should return false if outside repository" do
      @wrapper.stub!(:call_repo_discovery => false)
      @wrapper.in_repo?.should be_false
    end
  end
  
  describe "fetch" do
    before(:each) do
      @wrapper.stub!(:has_remotes? => 1, :call_fetch => "")
    end
    
    it "should raise error if no remote repositories are defined" do
      @wrapper.should_receive(:has_remotes?).and_return(nil)
      lambda {
        @wrapper.fetch!
      }.should raise_error(/no remote/)
    end
    
    it "should know if a fetch didn't occur" do
      @wrapper.should_receive(:call_fetch).and_return "\n"
      @wrapper.fetch!.should == false
    end
    
    it "should know if a fetch occured" do
      @wrapper.should_receive(:call_fetch).and_return(
        "remote: Generating pack...\n" +
        "remote: Done counting 119 objects.\n" +
        "remote: Result has 90 objects.\n" +
        "remote: Deltifying 90 objects.\n" +
        "remote:  100% (90/90) done\n" +
        "remote: Total 90, written 90 (delta 55), reused 0 (delta 0)\n" +
        "Unpacking objects: 100% (90/90), done.\n" +
        "From git@foobar:baz\n" +
        "   e871819..110f4bc  master       -> origin/master\n"
      )
      
      @wrapper.fetch!.should == true
    end
    
  end
  
  describe "branch discovery" do
    before(:each) do
      @wrapper.stub!(:call_get_remote).and_return ""
      
      @wrapper.stub!(:call_get_local_branch).and_return " * master"
      @wrapper.stub!(:call_get_remote).with("master").and_return "upstream\n"
    end
    
    it "should find the current local branch" do
      @wrapper.local_branch.should == "master"
    end
    
    it "should find the current local branch, even if there are many branches" do
      @wrapper.stub!(:call_get_local_branch).and_return("  master\n* test\n  other")
      @wrapper.local_branch.should == "test"
    end
    
    it "should find the remote branch" do
      @wrapper.remote_branch.should == "upstream/master"
    end
    
    it "should return nil when no remote branch exists" do
      @wrapper.stub!(:call_get_local_branch).and_return "local"
      @wrapper.remote_branch.should be_nil
    end
  end
  
  describe "getting tracking information" do
    
    def tracking_info_should_be(local_changes, remote_changes, options = {})
      @wrapper.should_receive(:call_get_tracking_info).and_return(options[:for])
      @wrapper.get_tracking_info("master", "origin/master").should == [local_changes, remote_changes]
    end
    
    before(:each) do
      # Stub away the system command to be safe
      @wrapper.stub!(:call_get_tracking_info => "")
    end
    
    it "should raise error on unexpected output from command" do
      lambda {
        @wrapper.stub!(:call_get_tracking_info => nil)
        @wrapper.get_tracking_info("master", "origin/master")
      }.should raise_error
      
      lambda {
        @wrapper.stub!(:call_get_tracking_info => "  1\n    2\n   3\n")
        @wrapper.get_tracking_info("master", "origin/master")
      }.should raise_error
    end
    
    it "should be able to get the correct number of commits when nothing has changed" do
      tracking_info_should_be 0, 0, :for => "         1 "
    end
    
    it "should be able to get the correct number of commits when diverged" do
      tracking_info_should_be 1, 7, :for => " 1 <\n 7 >"
    end
    
    it "should be able to get the correct number of commits when remote is ahead" do
      tracking_info_should_be 0, 7, :for => " 7 >"
    end
    
    it "should be able to get the correct number of commits when remote is behind" do
      tracking_info_should_be 132, 0, :for => "  132 <"
    end
  end
  
end