import { Arrays } from "../../browser/tools/Arrays";
import { CryptIO } from "../crypt/CryptIO";
import { Files } from "../files/Files";
import { Permission } from "./permissions/Permission";
import { Role } from "./permissions/Role";
import { Token } from "./Token";
import { TokenDB } from "./TokenDB";
import { UserData } from "./UserData";
import { UserManagementServer } from "./UserManagementServer";

export class SerializedUserDB
{
  users:UserData[];
}

export class UserDB
{
  _ums:UserManagementServer;
  _path:string;

  users:UserData[] = [];
  _pendingUsers:UserData[] = [];

  _signUpTokens = new Map<string,Token>();
  _passwordChangeTokens = new Map<string,Token>();
  



  async hasUserWithEmail( email:string ):Promise<boolean>
  {
    return this.users.findIndex( u => u.email === email ) != -1;
  }

  async hasUserWithID( id:string ):Promise<boolean>
  {
    return this.users.findIndex( u => u.id === id ) != -1;
  }

  async signUp( email:string, password:string, userName:string = "User" ):Promise<UserData>
  {
    let userData = this._pendingUsers.find( u => u.email === email );
    
    if ( ! userData )
    {
      userData = new UserData();
      userData.id = CryptIO.createUUID();
      userData.email = email;
      userData.hashedPassword = await CryptIO.hash( password );
      userData.name = userName;
      userData.role = Role.User;
      userData.permissions = [];
      
      this._pendingUsers.push( userData );
      
      await this.save();

    }


    return Promise.resolve( userData );
  }

  async createSignUpConfirmation( userData:UserData, ip:string ):Promise<Token>
  {
    let token = await this._ums.tokenDB.create( ip );

    this._signUpTokens.set( userData.id, token );

    return Promise.resolve( token );
  }

  async createPasswordChange( userData:UserData, ip:string ):Promise<Token>
  {
    let token = await this._ums.tokenDB.create( ip );

    this._passwordChangeTokens.set( userData.id, token );

    return Promise.resolve( token );
  }

  async byID( id:string )
  {
    return this.users.find( u => u.id === id );
  }

  async byEmail( email:string )
  {
    return this.users.find( u => u.email === email );
  }

  async confirmUserSignUp( userID:string, tokenID:string, ip:string ):Promise<boolean>
  {
    let user = this._pendingUsers.find( u => u.id == userID );

    if ( ! user )
    {
      return Promise.resolve( false );
    }

    if ( ! this._signUpTokens.has( userID ) )
    {
      return Promise.resolve( false );
    }

    let token = this._signUpTokens.get( userID );

    if ( token.id != tokenID )
    {
      return Promise.resolve( false );
    }

    let isValid = await this._ums.tokenDB.validate( token, ip );

    if ( isValid )
    {
      Arrays.remove( this._pendingUsers, user );
      this._signUpTokens.delete( userID );
      this._ums.tokenDB._tokens.delete( token.id );
      this.users.push( user );

      await this.save();

    }

    return Promise.resolve( isValid );
  }

  async changePassword( userID:string, tokenID:string, password:string, ip:string ):Promise<boolean>
  {
    if ( ! this._passwordChangeTokens.has( userID ) )
    {
      return Promise.resolve( false );
    }

    let token = this._passwordChangeTokens.get( userID );

    if ( token.id != tokenID )
    {
      return Promise.resolve( false );
    }

    let isValid = await this._ums.tokenDB.validate( token, ip );

    if ( isValid )
    {
      this._passwordChangeTokens.delete( userID );
      this._ums.tokenDB._tokens.delete( token.id );
      let userData = await this._ums.userDB.byID( userID );
      userData.hashedPassword = await CryptIO.hash( password );

      await this.save();

    }

    return Promise.resolve( isValid );
  }

  async renew( oldToken:string, renewal:string, ip:string ):Promise<Token>
  {
    let session = this._ums._sessions.get( oldToken );
    let tokenData = this._ums._tokenDB._tokens.get( session.token );

    if ( tokenData.renewalToken !== renewal )
    {
      return Promise.resolve( null );
    }

    let hour = 60;
    let day = hour * 24;
    let week = day * 7;

    let token = await this._ums.tokenDB.create( ip, week );

    return Promise.resolve( token );
  }

  async login( email:string, password:string, ip:string ):Promise<Token>
  {
    let user = await this.byEmail( email );

    if ( ! user )
    {
      return Promise.resolve( null );
    }

    let passwordValid = await CryptIO.verifyHash( password, user.hashedPassword );

    if ( ! passwordValid )
    {
      return Promise.resolve( null );
    }

    let hour = 60;
    let day = hour * 24;
    let week = day * 7;

    let token = await this._ums.tokenDB.create( ip, week );

    return Promise.resolve( token );
  }

  async hasPermission( ud:UserData, permissionID:string )
  {
    let hasOwnPermission = await this._hasPermission( permissionID, ud.permissions );

    if ( hasOwnPermission )
    {
      return Promise.resolve( true );
    }

    let roleID = ud.role;

    while ( roleID )
    {
      let role = this._ums._roles.get( roleID );

      if ( ! role )
      {
        return Promise.resolve( false );
      }
      
      let hasRolePermission = await this._hasPermission( permissionID, role.permissions );
      
      if ( hasRolePermission )
      {
        return Promise.resolve( true );
      }

      roleID = role.inherits;  
    }

    return Promise.resolve( false );
  }

  protected async _hasPermission( permissionID:string, permissions:Permission[] ):Promise<boolean>
  {
    permissions = permissions || [];

    for ( let p of permissions )
    {
      if ( Permission.isMatching( permissionID, p ) )
      {
        return Promise.resolve( true );
      }
    }

    return Promise.resolve( false );
  }

  async save()
  {
    let serializedDB = new SerializedUserDB();
    serializedDB.users = this.users;
    
    await Files.saveJSON( this._path, serializedDB );

    return Promise.resolve();
  }

  static async load( ums:UserManagementServer, path:string ):Promise<UserDB>
  {
    let userDB = new UserDB();
    userDB._ums = ums;
    userDB._path = path;

    let userDBExists = await Files.exists( userDB._path );

    if ( userDBExists )
    {
      let data = await Files.loadJSON<SerializedUserDB>( userDB._path );
      userDB.users = data.users;
    }


    return Promise.resolve( userDB );
  }

  

}