/*
 * h2_ui.h -- OreBolt OS shared UI header
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * Modules compiled as standalone .mod binaries call
 * init_h2_graphics_runtime() in their main().  The launcher (h2_test)
 * uses the module metadata table to build the menu and fork/exec each
 * selected module.
 *
 * Display: 320x240 RGB565 via /dev/fb0 (fbdev driver)
 * Input:   Rotary encoder via /dev/input/event0 (evdev driver, encoder type)
 */

#ifndef H2_UI_H
#define H2_UI_H

#include <stdint.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

/* ================================================================== */
/*  Module Registration API (used by launcher main.c)                    */
/* ================================================================== */

typedef enum {
    H2_MOD_VAULT = 0,
    H2_MOD_NETTAP,
    H2_MOD_SCALPEL,
    H2_MOD_DEPLOY,
    H2_MOD_STUDIO,
    H2_MOD_PROBE,
    H2_MOD_VTERM,
    H2_MOD_PAUTO,
    H2_MOD_EXTRACT,
    H2_MOD_NOISE,
    H2_MOD_RESET,
    H2_MOD_RETRO,
    H2_MOD_RETRO_INPUT_MAPPER,
    H2_MOD_RFID,
    H2_MOD_GLITCH,
    H2_MOD_PWDB,
    H2_MOD_PROXALARM,
    H2_MOD_BITCHAT,
    H2_MOD_COUNT
} H2_MODULE_ID;

typedef struct {
    H2_MODULE_ID  id;
    const char   *name;
    const char   *version;
    const char   *license;
    const char   *mod_binary;  /* filename in /apps/ for fork/exec */
} h2_module_t;

int  h2_ui_register_module(const h2_module_t *mod);
void h2_ui_unregister_module(H2_MODULE_ID id);
const h2_module_t *h2_ui_lookup_module(const char *name);

/* ================================================================== */
/*  LCD Constants                                                      */
/* ================================================================== */

#define H2_LCD_WIDTH   320
#define H2_LCD_HEIGHT  240
#define H2_LCD_BPP     16

/* ================================================================== */
/*  Color Palette (RGB565 raw + LVGL lv_color_make for modules)        */
/* ================================================================== */

/* Raw RGB565 for use in styles */
#define H2_COLOR_BG       0x0000
#define H2_COLOR_FG       0xFFFF
#define H2_COLOR_ACCENT   0xFD20
#define H2_COLOR_WARN     0xFFE0
#define H2_COLOR_DANGER   0xF800
#define H2_COLOR_OK       0x07E0

/* The graphics init function below defines LVGL color objects:
 *   COLOR_BG      = near-black       lv_color_make(14, 18, 24)
 *   COLOR_PRIMARY = red-orange accent lv_color_make(253, 32, 0)
 *   COLOR_ACCENT  = green status      lv_color_make(0, 220, 110)
 *   COLOR_TEXT    = near-white text   lv_color_make(240, 244, 250)
 *   COLOR_MUTED   = gray secondary    lv_color_make(90, 105, 120)
 * These are only available after calling init_h2_graphics_runtime().
 */

/* ================================================================== */
/*  Graphics Runtime Initializer (v1.3, used by standalone modules)    */
/* ================================================================== */

/*
 * Include LVGL and driver headers only when building module .mod
 * binaries (which call init_h2_graphics_runtime).  The launcher
 * also calls this for its menu, so it always needs them.
 *
 * Standalone daemons (e.g. retro_input_mapper) do NOT use LVGL
 * and should not include this header.
 */
#include "lvgl/lvgl.h"
#include "lv_drivers/display/fbdev.h"
#include "lv_drivers/indev/evdev.h"

#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/input.h>

/* 5-color dark theme palette used across all modules */
#define COLOR_BG      lv_color_make(14, 18, 24)
#define COLOR_PRIMARY lv_color_make(253, 32, 0)
#define COLOR_ACCENT  lv_color_make(0, 220, 110)
#define COLOR_TEXT    lv_color_make(240, 244, 250)
#define COLOR_MUTED   lv_color_make(90, 105, 120)

/*
 * Initialize LVGL, the Linux framebuffer display driver, and the
 * rotary encoder input driver.  Call once at module startup.
 *
 * The draw buffer is 320*16 lines (10,240 pixels = 20,480 bytes at
 * RGB565).  This is the partial-flush buffer -- LVGL redraws 16
 * scanlines at a time to minimize tearing and memory usage.
 *
 * The 'module_name' parameter is reserved for future log integration
 * and is currently unused.
 */
static inline void init_h2_graphics_runtime(const char *module_name) {
    (void)module_name;

    lv_init();
    fbdev_init();

    static lv_disp_draw_buf_t disp_buf;
    static lv_color_t buf[320 * 16];
    lv_disp_draw_buf_init(&disp_buf, buf, NULL, 320 * 16);

    static lv_disp_drv_t disp_drv;
    lv_disp_drv_init(&disp_drv);
    disp_drv.draw_buf = &disp_buf;
    disp_drv.flush_cb = fbdev_flush;
    disp_drv.horizontal_res = 320;
    disp_drv.vertical_res = 240;
    lv_disp_drv_register(&disp_drv);

    evdev_init();
    static lv_indev_drv_t indev_drv;
    lv_indev_drv_init(&indev_drv);
    indev_drv.type = LV_INDEV_TYPE_ENCODER;
    indev_drv.read_cb = evdev_read;
    lv_indev_register(&indev_drv);

    lv_obj_t *scr = lv_scr_act();
    lv_obj_set_style_bg_color(scr, COLOR_BG, LV_PART_MAIN);
}

/* ================================================================== */
/*  H2 Input Event Codes                                               */
/* ================================================================== */

#define H2_KEY_PLAY        164
#define H2_KEY_BACK        158
#define H2_KEY_PREV        165
#define H2_KEY_NEXT        163
#define H2_ROTARY_REL      0
#define H2_ROTARY_PRESS    115

#ifdef __cplusplus
}
#endif
#endif /* H2_UI_H */