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

package preferences

/*
#include <stdlib.h>
#include "native.h"
*/
import "C"

import (
	"strings"
	"unsafe"

	"git.stormux.org/storm/cthulhu/internal/input"
)

var modifierKeys = []string{"Insert", "KP_Insert", "Caps_Lock"}

func (session *uiSession) setKeyBindings(values Values) {
	session.bindingDraft = input.CloneBindingOverrides(values.KeyBindings)
	setCheck("generalDesktopButton", values.KeyboardLayout != 2)
	setCheck("generalLaptopButton", values.KeyboardLayout == 2)
	setModifierKeys(values.CthulhuModifierKeys)
	session.bindingLayout = values.KeyboardLayout
	if session.bindingLayout != 2 {
		session.bindingLayout = 1
	}
	setCheck("keyBindingDesktopButton", session.bindingLayout == 1)
	setCheck("keyBindingLaptopButton", session.bindingLayout == 2)
	session.populateKeyBindings(0)
}

func (session *uiSession) refreshKeyBindingLayout() {
	layout := 1
	if getCheck("keyBindingLaptopButton") {
		layout = 2
	}
	if layout != session.bindingLayout && (layout == 1 || layout == 2) {
		session.bindingLayout = layout
		session.populateKeyBindings(0)
	}
}

func (session *uiSession) populateKeyBindings(selected int) {
	session.bindingRows = input.BindingRows(input.KeyboardLayout(session.bindingLayout), session.bindingDraft)
	C.prefs_bindings_clear()
	for _, row := range session.bindingRows {
		scope := "Global"
		if row.Scope == "browse" {
			scope = "Browse mode"
		}
		keys := row.Keys
		if keys == "" {
			keys = "Unbound"
		}
		label, scopeText, shortcuts, defaults := C.CString(row.Label), C.CString(scope), C.CString(keys), C.CString(row.DefaultKeys)
		C.prefs_binding_append(label, scopeText, shortcuts, defaults)
		C.free(unsafe.Pointer(label))
		C.free(unsafe.Pointer(scopeText))
		C.free(unsafe.Pointer(shortcuts))
		C.free(unsafe.Pointer(defaults))
	}
	C.prefs_binding_select(C.int(selected))
	// Keep the editor empty when the selected command has been disabled.
	if selected >= 0 && selected < len(session.bindingRows) {
		id, text := C.CString("keyBindingEntry"), C.CString(session.bindingRows[selected].Keys)
		C.prefs_entry_set(id, text)
		C.free(unsafe.Pointer(id))
		C.free(unsafe.Pointer(text))
	}
}

func (session *uiSession) editKeyBinding(action int) {
	selected := int(C.prefs_binding_selected())
	if action != 7 && (selected < 0 || selected >= len(session.bindingRows)) {
		return
	}
	draft := input.CloneBindingOverrides(session.bindingDraft)
	var row input.BindingRow
	if selected >= 0 && selected < len(session.bindingRows) {
		row = session.bindingRows[selected]
	}
	kept := draft[:0]
	for _, override := range draft {
		matches := override.Layout == input.KeyboardLayout(session.bindingLayout) && (action == 7 || (override.Scope == row.Scope && override.Command == row.Command))
		if !matches {
			kept = append(kept, override)
		}
	}
	draft = kept
	if action == 4 || action == 5 {
		keys := []string{}
		if action == 4 {
			id := C.CString("keyBindingEntry")
			text := C.GoString(C.prefs_entry_get(id))
			C.free(unsafe.Pointer(id))
			if strings.TrimSpace(text) != "" {
				for _, key := range strings.Split(text, ";") {
					chord, err := input.ParseCommandChord(key)
					if err != nil {
						status(err.Error(), true)
						return
					}
					keys = append(keys, input.FormatCommandChord(chord))
				}
			}
		}
		draft = append(draft, input.BindingOverride{Layout: input.KeyboardLayout(session.bindingLayout), Scope: row.Scope, Command: row.Command, Keys: keys})
	}
	if err := input.ValidateBindingOverrides(draft); err != nil {
		status(err.Error(), true)
		return
	}
	session.bindingDraft = draft
	session.populateKeyBindings(selected)
	status("Binding updated. Apply or OK commits these changes.", true)
}

func setModifierKeys(keys []string) {
	for _, key := range modifierKeys {
		enabled := false
		for _, configured := range keys {
			if configured == key {
				enabled = true
				break
			}
		}
		id := C.CString(key)
		C.prefs_modifier_set(id, boolean(enabled))
		C.free(unsafe.Pointer(id))
	}
}

func getModifierKeys() []string {
	keys := []string{}
	for _, key := range modifierKeys {
		id := C.CString(key)
		if C.prefs_modifier_get(id) != 0 {
			keys = append(keys, key)
		}
		C.free(unsafe.Pointer(id))
	}
	return keys
}