// +build example

package main

import (
        "fmt"
        "log"
        "strconv"
        "strings"

        "github.com/hajimehoshi/ebiten"
        "github.com/hajimehoshi/ebiten/ebitenutil"
)

const (
        screenWidth  = 640
        screenHeight = 480
)

func update(screen *ebiten.Image) error {
        ids := ebiten.GamepadIDs()
        axes := map[int][]string{}
        pressedButtons := map[int][]string{}

        for _, id := range ids {
                maxAxis := ebiten.GamepadAxisNum(id)
                for a := 0; a < maxAxis; a++ {
                        v := ebiten.GamepadAxis(id, a)
                        axes[id] = append(axes[id], fmt.Sprintf("%d:%0.2f", a, v))
                }
                maxButton := ebiten.GamepadButton(ebiten.GamepadButtonNum(id))
                for b := ebiten.GamepadButton(id); b < maxButton; b++ {
                        if ebiten.IsGamepadButtonPressed(id, b) {
                                pressedButtons[id] = append(pressedButtons[id], strconv.Itoa(int(b)))
                        }
                }
        }

        if ebiten.IsRunningSlowly() {
                return nil
        }

        // Draw the current gamepad status.
        str := ""
        if len(ids) > 0 {
                for _, id := range ids {
                        str += fmt.Sprintf("Gamepad (ID: %d):\n", id)
                        str += fmt.Sprintf("  Axes:    %s\n", strings.Join(axes[id], ", "))
                        str += fmt.Sprintf("  Buttons: %s\n", strings.Join(pressedButtons[id], ", "))
                        str += "\n"
                }
        } else {
                str = "Please connect your gamepad."
        }
        ebitenutil.DebugPrint(screen, str)
        return nil
}

func main() {
        if err := ebiten.Run(update, screenWidth, screenHeight, 1, "Gamepad (Ebiten Demo)"); err != nil {
                log.Fatal(err)
        }
}