#pragma once

#include <cstddef>
#include <cstdint>

namespace kvida {

// Starts mDNS-based MQTT broker discovery (_mqtt._tcp) and, once found,
// connects the MQTT client and publishes Home Assistant MQTT Discovery
// for a diagnostic "connectivity" entity. Safe to call multiple times
// (no-op if already connecting/connected).
void start_mqtt();

bool mqtt_connected();

// Publishes a named numeric value as a Home Assistant MQTT Discovery
// sensor: `kvida/<id>/<name>` state topic, `homeassistant/sensor/<id>/<name>/config`
// discovery topic. This is the semantic publish(name, value) API AGENTS.md
// describes -- driven by `lua_runtime`'s `kvida.publish()`, not called
// directly by other components. Discovery is republished (retained, so
// idempotent) on every call rather than cached behind a per-name
// "already announced" flag -- simpler, at the cost of a bit of extra
// retained-message traffic each call. TODO: cache announced names if
// that traffic becomes a real concern.
void publish_value(const char *name, double value);

// Registered by main to receive "set LED color" commands from Home
// Assistant (an RGB light entity) without transport depending on
// `drivers` directly.
using LedColorHandler = void (*)(uint8_t red, uint8_t green, uint8_t blue);
void set_led_color_handler(LedColorHandler handler);

// Same no-dependency-on-other-components pattern as LedColorHandler:
// registered by main so a POST to /api/script can hand the new script to
// `lua_runtime` without transport depending on it. `script` is not
// NUL-terminated by the caller's guarantee -- handlers must use `len`.
using ScriptChangeHandler = void (*)(const char *script, size_t len);
void set_script_change_handler(ScriptChangeHandler handler);

// Registered by main so GET /api/script can pull the currently-running
// script from `lua_runtime`. Called with a buffer of size `cap`; returns
// the number of bytes written (0 if no provider is registered yet).
using ScriptProvider = size_t (*)(char *buf, size_t cap);
void set_script_provider(ScriptProvider provider);

} // namespace kvida