# encoding: utf-8

module Github
  class GitData
    module Commits

      VALID_COMMIT_PARAM_NAMES = %w[
        message
        tree
        parents
        author
        committer
        name
        email
        date
      ].freeze

      REQUIRED_COMMIT_PARAMS = %w[
        message
        tree
        parents
      ].freeze

      # Get a commit
      #
      # = Examples
      #  @github = Github.new
      #  @github.git_data.commit 'user-name', 'repo-name', 'sha'
      #
      def commit(user_name, repo_name, sha, params={})
        _update_user_repo_params(user_name, repo_name)
        _validate_user_repo_params(user, repo) unless user? && repo?
        _validate_presence_of sha
        _normalize_params_keys(params)

        get("/repos/#{user}/#{repo}/git/commits/#{sha}", params)
      end
      alias :get_commit :commit

      # Create a commit
      #
      # = Parameters
      # * <tt>message</tt> - String of the commit message
      # * <tt>tree</tt> - String of the SHA of the tree object this commit points to
      # * <tt>parents</tt> - Array of the SHAs of the commits that were the parents of this commit. If omitted or empty, the commit will be written as a root commit. For a single parent, an array of one SHA should be provided, for a merge commit, an array of more than one should be provided.
      #
      # = Optional Parameters
      #
      # The committer section is optional and will be filled with the author data if omitted. If the author section is omitted, it will be filled in with the authenticated users information and the current date.
      #
      # * author.name:: String of the name of the author of the commit
      # * author.email:: String of the email of the author of the commit
      # * author.date:: Timestamp of when this commit was authored
      # * committer.name:: String of the name of the committer of the commit
      # * committer.email:: String of the email of the committer of the commit
      # * committer.date:: Timestamp of when this commit was committed
      #
      # = Examples
      #  @github = Github.new
      #  @github.git_data.create_commit 'user-name', 'repo-name',
      #    "message": "my commit message",
      #    "author": {
      #      "name": "Scott Chacon",
      #      "email": "schacon@gmail.com",
      #      "date": "2008-07-09T16:13:30+12:00"
      #    },
      #   "parents": [
      #      "7d1b31e74ee336d15cbd21741bc88a537ed063a0"
      #    ],
      #    "tree": "827efc6d56897b048c772eb4087f854f46256132"]
      #
      def create_commit(user_name, repo_name, params={})
        _update_user_repo_params(user_name, repo_name)
        _validate_user_repo_params(user, repo) unless user? && repo?
        _normalize_params_keys(params)
        _filter_params_keys(VALID_COMMIT_PARAM_NAMES, params)

        raise ArgumentError, "Required params are: message, tree, parents" unless _validate_inputs(REQUIRED_COMMIT_PARAMS, params)

        post("/repos/#{user}/#{repo}/git/commits", params)
      end

    end # Commits
  end # GitData
end # Github