#
# Cookbook Name:: mysql
# Provider:: mysql_database
#
# Copyright 2013, OpenStreetMap Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

def load_current_resource
  @mysql = Chef::MySQL.new

  @current_resource = Chef::Resource::MysqlDatabase.new(new_resource.name)
  @current_resource.database(new_resource.database)
  if mysql_database = @mysql.databases[@current_resource.database]
    @current_resource.permissions(mysql_database[:permissions])
  end
  @current_resource
end

action :create do
  unless @mysql.databases.include?(new_resource.database)
    converge_by("create #{new_resource}") do
      Chef::Log.info("Creating #{new_resource}")
      @mysql.execute(:command => "CREATE DATABASE `#{new_resource.database}`")
    end
  end

  new_permissions = Hash[new_resource.permissions.collect do |user,privileges|
    [@mysql.canonicalise_user(user), privileges]
  end]

  @current_resource.permissions.each do |user,privileges|
    unless new_permissions[user]
      converge_by("revoke all for #{user} on #{new_resource}") do
        Chef::Log.info("Revoking all for #{user} on #{new_resource}")
        @mysql.execute(:command => "REVOKE ALL ON `#{new_resource.database}`.* FROM #{user}")
      end
    end
  end

  new_permissions.each do |user,new_privileges|
    current_privileges = @current_resource.permissions[user] || {}
    new_privileges = Array(new_privileges)

    if new_privileges.include?(:all)
      new_privileges |= (Chef::MySQL::DATABASE_PRIVILEGES - [:grant])
    end

    Chef::MySQL::DATABASE_PRIVILEGES.each do |privilege|
      if new_privileges.include?(privilege)
        unless current_privileges.include?(privilege)
          converge_by("grant #{privilege} for #{user} on mysql database #{new_resource}") do
            Chef::Log.info("Granting #{privilege} for #{user} on mysql database #{new_resource}")
            @mysql.execute(:command => "GRANT #{@mysql.privilege_name(privilege)} ON `#{new_resource.database}`.* TO #{user}")
          end
        end
      else
        if current_privileges.include?(privilege)
          converge_by("revoke #{privilege} for #{user} on #{new_resource}") do
            Chef::Log.info("Revoking #{privilege} for #{user} on #{new_resource}")
            @mysql.execute(:command => "REVOKE #{@mysql.privilege_name(privilege)} ON `#{new_resource.database}`.* FROM #{user}")
          end
        end
      end
    end
  end
end

action :drop do
  if @mysql.databases.include?(new_resource.database)
    converge_by("drop #{new_resource}") do
      Chef::Log.info("Dropping #{new_resource}")
      @mysql.execute(:command => "DROP DATABASE `#{new_resource.database}`")
    end
  end
end