// dot webapp.dot -Tpng -o webapp.png
digraph webapp {

"Front page" -> "New game"

"Front page" -> "Browse existing game" [label="game ID"]

email -> "Play in existing game" [label="game ID, player code"]

//////////////
// new game //
//////////////

"Create game object in DB" [shape="box3d"]
"New game" -> "Create game object in DB" [label="player names, emails"]
"Create player objects" [shape="box3d"]
"Create game object in DB" -> "Create player objects"
"Assign players random strings" [shape="box3d"]
"Create player objects" -> "Assign players random strings"
"Email each player" [shape="note"]
"Assign players random strings" -> "Email each player"
"Email each player" -> "END"

//////////////////////////
// browse existing game //
//////////////////////////

"Browse existing game" -> "Is game ID valid?"
"Is game ID valid?" -> "game id error" [label="no"]
"Is game ID valid?" -> "Show all moves" [label="yes"]
"Show all moves" -> "END"

///////////////////////////
// play in existing game //
///////////////////////////

"Play in existing game" -> "Is playing game ID valid?"
"Is playing game ID valid?" -> "game id error" [label="no"]
"Is playing game ID valid?" -> "Is player code valid?" [label="yes"]
"Is player code valid?" -> "invalid player error" [label="no"]
"Is player code valid?" -> "have you joined the game?" [label="yes"]
"have you joined the game?" -> "display 'join game yes/no'" [label="no"]
"have all players joined?" [shape="box3d"]
"save join status to DB" [shape="box3d"]
"display 'join game yes/no'" -> "save join status to DB" [label="yes clicked"]
"mail others to say you joined" [shape="note"]
"save join status to DB" -> "mail others to say you joined"
"mail others to say you joined" -> "have all players joined?"
"have all players joined?" -> "show game up to now" [label="yes"]
"have all players joined?" -> "display 'waiting for X, Y to join'" [label="no"]
"display 'join game yes/no'" -> "abandon game" [label="no clicked"]
"mail other players to abandon" [shape="note"]
"abandon game" -> "mail other players to abandon"
"mail other players to abandon" -> "END"
"show game up to now" -> "is it your move?"
"is it your move?" -> "display 'waiting for N to move'" [label="no"]
"is it your move?" -> "display 'valid moves are'" [label="yes"]
"save move to DB" [shape="box3d"]
"display 'valid moves are'" -> "save move to DB" [label="choose move"]
"send email to all players" [shape="note"]
"save move to DB" -> "send email to all players"
"send email to all players" -> "END"
}