/**
 * @file menu.c
 * @brief Menu system implementation
 */
#include <string.h>
#include "menu.h"

/* Menu item callbacks - forward declarations */
static void menu_cb_model(void);
static void menu_cb_rf(void);
static void menu_cb_channel(void);
static void menu_cb_mixer(void);
static void menu_cb_usb(void);
static void menu_cb_audio(void);
static void menu_cb_other(void);

/* Sub-menu definitions */

static const menu_item_t menu_items_main[] = {
    {"模型选择",     menu_cb_model,   NULL},
    {"高频头配置",   menu_cb_rf,      NULL},
    {"通道映射",     menu_cb_channel, NULL},
    {"混控设置",     menu_cb_mixer,   NULL},
    {"USB设置",      menu_cb_usb,     NULL},
    {"音频配置",     menu_cb_audio,   NULL},
    {"其他",         menu_cb_other,   NULL},
    {"返回",         menu_back,        NULL},
};

static menu_t menu_main = {
    .title = "主菜单",
    .items = menu_items_main,
    .item_count = 8,
    .current = 0,
};

/* Menu stack for navigation */
#define MENU_STACK_DEPTH 8
static menu_t *menu_stack[MENU_STACK_DEPTH];
static uint8_t menu_stack_depth = 0;

static menu_t *current_menu = &menu_main;

void menu_init(void)
{
    current_menu = &menu_main;
    current_menu->current = 0;
    menu_stack_depth = 0;
}

void menu_up(void)
{
    if (current_menu->current > 0) {
        current_menu->current--;
    }
}

void menu_down(void)
{
    if (current_menu->current < current_menu->item_count - 1) {
        current_menu->current++;
    }
}

void menu_select(void)
{
    const menu_item_t *item = &current_menu->items[current_menu->current];
    
    if (item->submenu) {
        /* Push to sub-menu */
        if (menu_stack_depth < MENU_STACK_DEPTH) {
            menu_stack[menu_stack_depth++] = current_menu;
        }
        current_menu = item->submenu;
        current_menu->current = 0;
    } else if (item->callback) {
        item->callback();
    }
}

void menu_back(void)
{
    if (menu_stack_depth > 0) {
        current_menu = menu_stack[--menu_stack_depth];
    }
}

const menu_t* menu_get_current(void)
{
    return current_menu;
}

const char* menu_get_current_item_name(void)
{
    return current_menu->items[current_menu->current].name;
}

void menu_draw(void)
{
    /* TODO: Implement OLED drawing */
    /* Will display:
       - Top bar: menu title
       - Up to 5 visible items with cursor indicator
       - Scroll indicator if more items
    */
}

/* Callback stubs */
static void menu_cb_model(void) { }
static void menu_cb_rf(void) { }
static void menu_cb_channel(void) { }
static void menu_cb_mixer(void) { }
static void menu_cb_usb(void) { }
static void menu_cb_audio(void) { }
static void menu_cb_other(void) { }