Rock-Paper-Scissor in EVE

rock-paper-scissor.eve

# Rock Scissor Paper

Based on https://rosettacode.org/wiki/Rock-paper-scissors

Rules are simple:
The winner is decided by a set of rules:

  * Rock beats scissors
  * Scissors beat paper
  * Paper beats rock

```
match
  [#session-connect]
commit
  [#win-condition winner: "rock" looser: "scissor"]
  [#win-condition winner: "scissor" looser: "paper"]
  [#win-condition winner: "paper" looser: "rock"]
  [#choice kind: "rock", id: 0]
  [#choice kind: "scissor", id: 1]
  [#choice kind: "paper", id: 2]
  [@app aiScore: 0, playerScore: 0]
```

## Present the user a choice

```
match
 choice = [#choice kind]
 app = [@app]
bind
  [#div text: "Choose your weapon: " children:
    [#button @choice choice text: "{{kind}}"]
    [#div app text: "Player-Score: {{app.playerScore}}, AI-Score: {{app.aiScore}}"]]
```

## What happens, when the user clicks on a choice?

```
match
  anybutton = [#button @choice]
  [#click #direct-target element: anybutton]
  choice = anybutton.choice
  app = [@app]
bind
  app.player := choice.kind
```

## The AI chooses, when the user made a choice

```
match
  app = [@app player]
  rnd = random[seed: 1] * 1000
  id = round[value: mod[value: rnd, by: 2]]
  ai_choice = [#choice id]
bind
  app.ai := ai_choice.kind
```

## Evaluate the winning condition:

```
match
  app = [@app player ai playerScore aiScore]
  (who_wins, newPlayerScore, newAiScore) = if [#win-condition winner: player, looser: ai] then ("player", playerScore + 1, aiScore)
                                           else if [#win-condition winner: ai, looser: player] then ("AI", playerScore, aiScore + 1)
                                           else ("Nobody, It's a draw.", playerScore, aiScore)
bind
  // These two lines break the execution (no results are shown) ======
  // app.playerScore := newPlayerScore
  // app.aiScore := newAiScore
  // =================================================================
  [#div text: "-> {{player}} vs {{ai}} => who won? {{who_wins}}"]
```