package game

import (
	"github.com/hajimehoshi/ebiten/v2"
	"github.com/hajimehoshi/ebiten/v2/inpututil"

	"gitea.brasse-pc.eu/brasse/metro-puzzle-jp/internal/sim"
)

const stickDeadzone = 0.5

// dirInput returnerar hållen riktning från tangentbord (pilar/WASD) eller
// gamepad (d-pad / vänster spak). None om inget hålls.
func dirInput() sim.Dir {
	if virtual.held != sim.None {
		return virtual.held
	}
	switch {
	case ebiten.IsKeyPressed(ebiten.KeyArrowUp) || ebiten.IsKeyPressed(ebiten.KeyW):
		return sim.Up
	case ebiten.IsKeyPressed(ebiten.KeyArrowDown) || ebiten.IsKeyPressed(ebiten.KeyS):
		return sim.Down
	case ebiten.IsKeyPressed(ebiten.KeyArrowLeft) || ebiten.IsKeyPressed(ebiten.KeyA):
		return sim.Left
	case ebiten.IsKeyPressed(ebiten.KeyArrowRight) || ebiten.IsKeyPressed(ebiten.KeyD):
		return sim.Right
	}
	for _, id := range ebiten.AppendGamepadIDs(nil) {
		if !ebiten.IsStandardGamepadLayoutAvailable(id) {
			continue
		}
		switch {
		case ebiten.IsStandardGamepadButtonPressed(id, ebiten.StandardGamepadButtonLeftTop):
			return sim.Up
		case ebiten.IsStandardGamepadButtonPressed(id, ebiten.StandardGamepadButtonLeftBottom):
			return sim.Down
		case ebiten.IsStandardGamepadButtonPressed(id, ebiten.StandardGamepadButtonLeftLeft):
			return sim.Left
		case ebiten.IsStandardGamepadButtonPressed(id, ebiten.StandardGamepadButtonLeftRight):
			return sim.Right
		}
		x := ebiten.StandardGamepadAxisValue(id, ebiten.StandardGamepadAxisLeftStickHorizontal)
		y := ebiten.StandardGamepadAxisValue(id, ebiten.StandardGamepadAxisLeftStickVertical)
		switch {
		case y < -stickDeadzone:
			return sim.Up
		case y > stickDeadzone:
			return sim.Down
		case x < -stickDeadzone:
			return sim.Left
		case x > stickDeadzone:
			return sim.Right
		}
	}
	return sim.None
}

// confirmJustPressed: Enter/mellanslag eller gamepadens nedre knapp (A/kryss).
func confirmJustPressed() bool {
	if virtual.pressed["enter"] {
		return true
	}
	if inpututil.IsKeyJustPressed(ebiten.KeyEnter) || inpututil.IsKeyJustPressed(ebiten.KeySpace) {
		return true
	}
	return gamepadJustPressed(ebiten.StandardGamepadButtonRightBottom)
}

// backJustPressed: Escape eller gamepadens högra knapp (B/cirkel).
func backJustPressed() bool {
	return virtual.pressed["esc"] || inpututil.IsKeyJustPressed(ebiten.KeyEscape) || gamepadJustPressed(ebiten.StandardGamepadButtonRightRight)
}

// menuMove returnerar -1/+1 när användaren just tryckte upp/ner i en meny.
func menuMove() int {
	switch {
	case virtual.pressed["up"]:
		return -1
	case virtual.pressed["down"]:
		return 1
	case inpututil.IsKeyJustPressed(ebiten.KeyArrowUp) || inpututil.IsKeyJustPressed(ebiten.KeyW) || gamepadJustPressed(ebiten.StandardGamepadButtonLeftTop):
		return -1
	case inpututil.IsKeyJustPressed(ebiten.KeyArrowDown) || inpututil.IsKeyJustPressed(ebiten.KeyS) || gamepadJustPressed(ebiten.StandardGamepadButtonLeftBottom):
		return 1
	}
	return 0
}

func gamepadJustPressed(b ebiten.StandardGamepadButton) bool {
	for _, id := range ebiten.AppendGamepadIDs(nil) {
		if ebiten.IsStandardGamepadLayoutAvailable(id) && inpututil.IsStandardGamepadButtonJustPressed(id, b) {
			return true
		}
	}
	return false
}

// inpututil_R: R = spela om banan.
func inpututil_R() bool { return virtual.pressed["r"] || inpututil.IsKeyJustPressed(ebiten.KeyR) }