require "git"
require 'logger'
require 'colorize'  
require "ap"

require_relative "../git-hack"
require_relative "../core_ext/path"
require_relative "../core_ext/save_execute"

module GitHack
	# GitRepo类拥有git的所有
	# 包括.git文件下所有的文件的功能的@git ,GitHack::Git类
	#     work，即工作目录及文件 GitHack::WorkingDirectory类
	#     remote，对应远程库信息 GitHack::Remote类
	#
	# 对外操作的函数:
	#  # init(dir)
	#  # goto(number)
	#  # redo
	#  # undo
	#
	class GitRepo < Git::Path
		include PathCommon
		include SaveExecute

		attr_accessor :git,:commits,:work,:remote,:current_commit
		
		def initialize(path)
			@workingdirectory = get_gitdir(path)	
			@git = nil
			@commits = nil
			@commit_facade = nil
		end

		# 属性函数
		def git
			@git ||= Git.open(@workingdirectory ,:log => Logger.new(STDOUT)) 
		end
		def commit_facade
			@commit_facade ||= CommitFacade.new(@workingdirectory)
		end
		def commits
			@commits ||= commit_facade.get_log_commits
		end
		#
		# 把工作目录的文件添加到git仓库并提交 
		#
		def git_save(msg,options={})
			ready_to_execute
			return self if not_git_directory?
			add_workingdirectory
			commit(msg)
			execute_success
			self
		end

		# undo 回到上一次提交
		def undo
			goto(1)
		end
		# redo 到当前提交的下一个提交
		def redo
			ready_to_execute
			return self if not_git_directory?
			next_commit = commit_facade.get_next_commit
			return self if !next_commit
			git.reset_hard(next_commit)
			execute_success
			self
		end
		# 回到前第number个保存
		#
		def goto(number,options={})
			ready_to_execute
			return self if not_git_directory?
			ap commits
			git.reset_hard(commits[number].sha)
			execute_success
			self
		end
		# 初始化空文件夹成为git库
		def init(dir)
			@git = Git.init(dir)
			@workingdirectory = dir
		end
		def show_commits
			ap commits
		end
		#
		# 得到本身或是上层目录中.git文件的路经
		#
		def get_gitdir(path)
			git_path = absolute_path(path)
			return nil if git_path == "/"
			return git_path if is_gitdir?(git_path) 
			return get_gitdir(join(git_path,"/../"))
		end

		private
		def not_git_directory?
			if @workingdirectory == nil
				puts "Not a git directory ,run `git init` first"
				return true
			end
			return false
		end
		def is_gitdir?(path)
			File.directory?(join(path,".git")) ? true : false
		end
		
		def add_workingdirectory
			git.add(@workingdirectory)	
		end
		def commit(msg)
			msg ||= auto_commit_msg 
			begin
				git.commit(msg,:add_all=>true)	
			rescue Git::GitExecuteError => e
				puts e.to_s.colorize(:green)
			end
		end
		def auto_commit_msg
			"auto commit" # TODO: 需要完成
		end
	end
end