require_relative '../user'
require_relative '../project'
require_relative '../sshkey'

require 'sqlite3'
require 'json'

module EmacsCollab
  module Database

    class SQLite
      def initialize(db_name)
        @db = SQLite3::Database.new "#{DATA_PATH}/#{db_name}.db"
      end
      
      def get_user(id)
        row = @db.execute("SELECT * FROM Users WHERE name = ?", [id])[0]
        unless row
          raise UserNotFoundError, "User with id #{id} could not be found in database"
        end

        user = User.new(row[0])
        user.pw_hash = row[1]
        user.salt = row[2]
        user.keys = row[3] == nil ? Array.new : Marshal.load(row[3])

        user
      end

      def get_users
        rows = @db.execute("SELECT * FROM Users")

        rows.map do |row|
          user = User.new(row[0])
          user.pw_hash = row[1]
          user.salt = row[2]
          user.keys = row[3] == nil ? Array.new : Marshal.load(row[3])
          user
        end
      end

      def add_user(user)
        @db.execute("INSERT INTO Users (name) VALUES (?)",
                    [user.id])
      end

      def update_user(user)
        @db.execute("UPDATE Users SET keys = ? WHERE name = ?",
                    [JSON.generate(user.keys),user.id])
      end
      
      def change_user_password(user,hash,salt)
        @db.execute("UPDATE Users SET passwd = ?, salt = ? WHERE name = ?",
                    [hash,salt,user.id])
      end
      
      def get_project(name)
        row = @db.execute("SELECT * FROM Projects WHERE name = ?", [name])[0]
        unless row
          raise EmacsCollab::ProjectNotFoundError, "Project with name #{name} could not be found in database"
        end

        proj = Project.new()
        proj.uid = row[0]
        proj.id = row[1]
        proj.path = row[2]
        proj.posixname = row[3]
        proj.owner = row[4]
        users = (row[5] == nil ? Array.new : Marshal.load(row[5]))
        users.each do |u|
          EmacsCollab.get_user_by_id(u.id).keys.each do |k|
            proj.add_key(k)
          end
        end
        proj
      end

      def get_projects
        rows = @db.execute("SELECT * FROM Projects")

        rows.map do |row|
          proj = Project.new()
          proj.uid = row[0]
          proj.id = row[1]
          proj.path = row[2]
          proj.posixname = row[3]
          proj.owner = row[4]
          users = (row[5] == nil ? Array.new : Marshal.load(row[5]))
          users.each do |u|          
            EmacsCollab.get_user_by_id(u).keys.each do |k|
              proj.add_key(k)
            end
          end
          proj.users = row[5]
          proj
        end
      end
      
      def add_project(proj)
        @db.execute("INSERT INTO Projects (uid,name,path,posixname,owner,users) VALUES (?,?,?,?,?,?)",
                    [ proj.uid, proj.id, proj.path, proj.posixname, "", Marshal.dump(proj.users) ])
      end

      def update_project(proj)
        @db.execute("UPDATE Projects SET name = ?, path = ?, posixname = ?, owner = ?, users = ? WHERE uid = ?",
                    [ proj.id, proj.path, proj.posixname, "", Marshal.dump(proj.users), proj.uid ])
      end
    end
  end
end

#user1 = User.new("user1")
#add_user(user1)
#change_user_password(user1,"testtest")