#
#  CommitsController.rb
#  GitNub
#
#  Created by Justin Palmer on 3/2/08.
#  Copyright (c) 2008 Active Reload, LLC. All rights reserved.
#
 
require 'osx/cocoa'
require 'md5'
require 'cgi'
 
class CommitsController < OSX::NSObject
  ib_outlet :commits_table
  ib_outlet :branch_select
  ib_outlet :paging_segment
  ib_outlet :commit_details
  
  def awakeFromNib  
    @repo_location = ENV['PWD'].nil? ? '' : ENV['PWD']
    @current_commit_offset = 0
    @offset = 50
    @active_commit = nil
    
    if(fetch_git_repository)
      fetch_commits_for :master, @offset
      setup_branches_menu
      setup_paging_control
      @commits_table.reloadData
      setup_commit_detail_view
    end
  end
  
  ib_action :page_commits
  def page_commits(segment)
    tag = segment.cell.tagForSegment(segment.selectedSegment)
    case tag
      when 0 then @current_commit_offset -= @offset
      when 1 then @current_commit_offset = 0
      when 2 then @current_commit_offset += @offset
    end
    
    @current_commit_offset = 0 if @current_commit_offset == -(@offset)
    fetch_commits_for(:master, @offset, @current_commit_offset)
    @commits_table.reloadData
    
    
    if @commits.size == 0 || @current_commit_offset == 0
      @paging_segment.setEnabled_forSegment(false, 0)
      @paging_segment.setEnabled_forSegment(true, 2) unless @commits.size == 0
    elsif ((@current_commit_offset >= @offset) && (@commits.size % @offset == 0))
      @paging_segment.setEnabled_forSegment(true, 0)
      @paging_segment.setEnabled_forSegment(true, 2)
    elsif @commits.size % @offset != 0
      @paging_segment.setEnabled_forSegment(true, 0)
      @paging_segment.setEnabled_forSegment(false, 2)
    end
  end
  
  def tableViewSelectionDidChange(notification)
    diffs = []
    doc = @commit_details.mainFrameDocument
    set_html("message", active_commit.message)
    set_html("hash", active_commit.id)
    
    file_list = doc.getElementById('files')
    diff_list = doc.getElementById('diffs')
    diff_list.setInnerHTML("")
    file_list.setInnerHTML("")
    active_commit.diffs.each_with_index do |diff, i|
      li = doc.createElement('li')
      li.setAttribute__('id', "item-#{i}")
      li.setInnerHTML(%(<a href="#diff-#{i}" class="">#{diff.b_path}</a>))
      file_list.appendChild(li)
      diff_div = doc.createElement('div')
      diff_div.setAttribute__('class', 'diff')
      diff_div.setAttribute__('id', "diff-#{i}")
      diff_div.setInnerHTML("
        <h3>#{File.basename(diff.b_path)}</h3>
        <pre><code>#{CGI.escapeHTML(diff.diff)}</pre></code>
      ")
      diff_list.appendChild(diff_div)
    end
  end
  
  # DataSource Methods
  def numberOfRowsInTableView(table_view)
    @commits ? @commits.size : 0
  end
  
  # There is something fishy with ImageTextCell and this method so 
  # we set the commit object to be used in dataElementForCell and return nil
  def tableView_objectValueForTableColumn_row(table_view, table_column, row)
    @commit = @commits[row]
    return nil
  end
  
  # ImageTextCell data methods
  def primaryTextForCell_data(cell, data)
    data.message.to_s
  end
  
  def secondaryTextForCell_data(cell, data)
    %(by #{data.committer.name} on #{data.committed_date.strftime("%A, %b %d, %I:%m %p")})
  end
  
  def iconForCell_data(icon, data)
    NSImage.alloc.initWithContentsOfURL(NSURL.URLWithString("http://www.gravatar.com/avatar.php?gravatar_id=#{MD5.hexdigest(data.committer.email)}&size=36"))
  end
  
  def dataElementForCell(cell)
    @commit
  end
  
  private
  
  def active_commit
    @commits[@commits_table.selectedRow]
  end
  
  def fetch_git_repository
    begin
      @repo = Grit::Repo.new(@repo_location)
    rescue Grit::InvalidGitRepositoryError
      return false
    end
  end
  
  def fetch_commits_for(branch, quanity, offset = 0)
    @commits = @repo.commits(branch, quanity, offset)
  end
  
  def setup_branches_menu
    @branch_select.removeAllItems
    @repo.branches.each do |branch|
      @branch_select.addItemWithTitle(branch.name)
    end
  end
  
  def setup_paging_control
    @paging_segment.setEnabled_forSegment(false, 2) if @commits.size < @offset
  end
  
  def setup_commit_detail_view
    commit_detail = File.join(NSBundle.mainBundle.bundlePath, "Contents", "Resources", "commit.html")
    @commit_details.mainFrame.loadRequest(NSURLRequest.requestWithURL(NSURL.fileURLWithPath(commit_detail)))
  end
  
  def set_html(element, html)
    @commit_details.mainFrameDocument.getElementById(element).setInnerHTML(html)
  end
end