// Copyright (c) 2026 Storm Dragon
// SPDX-License-Identifier: GPL-3.0-or-later

package input

import (
	"fmt"
	"time"

	"git.stormux.org/storm/fenrir/internal/command"
)

const DefaultMultiPressTimeout = 200 * time.Millisecond

// Set_multi_press_timeout changes the window between consecutive fresh presses.
// It preserves bindings and physical key ownership, but starts a new sequence.
func (r *Router) Set_multi_press_timeout(timeout time.Duration) error {
	if timeout < time.Millisecond || timeout > 5*time.Second {
		return fmt.Errorf("multi-press timeout must be between 1 and 5000 milliseconds")
	}
	r.multiPressTimeout = timeout
	r.lastPress = time.Time{}
	return nil
}

func (r *Router) multi_press(device int, combo chord, id command.ID, scriptChord bool) command.ID {
	if scriptChord || id == "" || r.doubleBindings[combo] == "" {
		r.lastPress = time.Time{}
		return id
	}
	now := time.Now()
	if r.now != nil {
		now = r.now()
	}
	elapsed := now.Sub(r.lastPress)
	if r.lastPress.IsZero() || r.lastDevice != device || r.lastChord != combo || elapsed < 0 || elapsed > r.multiPressTimeout {
		r.pressCount = 1
	} else {
		r.pressCount++
	}
	r.lastChord, r.lastDevice, r.lastPress = combo, device, now
	switch r.pressCount {
	case 2:
		id = r.doubleBindings[combo]
		if r.tripleBindings[combo] == "" {
			r.lastPress = time.Time{}
		}
	case 3:
		id = r.tripleBindings[combo]
		r.lastPress = time.Time{}
	}
	return id
}