mermaidjs

sequenceDiagram
	Client->>Server: Connect

    Server->>Login: Create
    activate Login
    loop while user not logged in
        Login->>Client: Request User Id
        Client-->>Login: <user id>
        Login ->> User Repository: create User with <user id>
        alt <user id> is available
            User Repository->>User Repository: make <user id> unavailable
            User Repository-->>Login: Success
            Login ->> Login: user logged in = True
        else
            User Repository -->> Login: Raise Error
        end
    end
    deactivate Login

    Server->>Select Deck: Create
    activate Select Deck
    Select Deck ->> Client: Request Deck
    loop while card_name != end_deck
        Client -->> Select Deck: card name
        Select Deck ->> Select Deck: parse and store
    end
    Select Deck ->> Client: Acknowledge Deck Size
    deactivate Select Deck


    Server->> Select Match: Create
    loop while match is not selected
        activate Select Match
        Select Match ->> Client: Request Match Id
        Client -->> Select Match: <match_id>
        Select Match ->> Client: Request Match Password
        Client -->> Select Match: <password>
        Select Match ->> Match Repository: fetch match <match id>
        alt match id exists
            Match Repository -->> Select Match: match
            Select Match ->> Select Match: check password
            alt correct password
                Select Match ->> Server :match
            end
        else
            Match Repository -->> Select Match: Raise Exception
            Select Match ->> Select Match: create match
            Select Match ->> Server :match
        end
        deactivate Select Match
    end

    Server->>Join: Create
    activate Join
    Join ->> Join: append player to match
    Join -->> Server: player index
    deactivate Join