#ifndef UI_MANAGER_H
#define UI_MANAGER_H

#include <stdbool.h>
#include <stdint.h>

#include "ha_data.h"
#include "lvgl.h"
#include "thermostat.h"

/*
 * The screen layout.
 *
 * This file is compiled into the desktop simulator as well as the firmware
 * (see sim/README.md), so it must never touch a driver, a socket or ESP-IDF
 * directly. Data arrives as ha_data_t; commands leave through the callback
 * below. Everything in between is drawing.
 */

void ui_init(void);

/* Safe to call from any task -- these take the LVGL lock internally. */

/* Redraw every panel from `data`. Cheap to call when nothing changed: every
 * label goes through a comparison first, so an unchanged value costs no
 * invalidation and therefore no flush. */
void ui_update(const ha_data_t *data);

void ui_set_status(const char *status);

/*
 * Mark the displayed readings as no longer trustworthy. Dims the temperature
 * so a value that stopped updating is visibly distinct from a live one,
 * rather than sitting there at full styling looking current.
 */
void ui_set_stale(bool stale);

/*
 * Called when the user operates a light tile.
 *
 * `index` indexes HA_LIGHTS. `brightness` is 0-255, or -1 for a plain on/off
 * with no brightness change (a tile tap, or any switch-domain entity).
 *
 * Runs on the LVGL task with the LVGL lock held, so the implementation must
 * not block: hand the command to another task rather than doing HTTP here.
 */
typedef void (*ui_light_cmd_cb_t)(int index, bool on, int16_t brightness);
void ui_set_light_cb(ui_light_cmd_cb_t cb);

/* Redraw the thermostat card from `st`. Same cheapness rules as ui_update. */
void ui_update_thermostat(const therm_status_t *st);

typedef enum {
    UI_THERM_SETPOINT_UP = 0,
    UI_THERM_SETPOINT_DOWN,
    UI_THERM_MODE_TOGGLE,
    UI_THERM_FAN_TOGGLE,
} ui_therm_cmd_t;

/*
 * Called when the user operates a thermostat control.
 *
 * Runs on the LVGL task with the lock held, so it must not block -- but
 * unlike the light commands there is no network here, so the handler can
 * apply the change and call ui_update_thermostat() straight back. The LVGL
 * lock is recursive, so that re-entry is fine.
 */
typedef void (*ui_therm_cmd_cb_t)(ui_therm_cmd_t cmd);
void ui_set_therm_cb(ui_therm_cmd_cb_t cb);

#endif