package js_input

import "core:sys/wasm/js"
import "core:log"

DEFAULT_INPUT_EVENT_CALLBACKS :: Input_Event_Callbacks{
    key_down = register_key_down_callback,
    key_up   = register_key_up_callback,
}

Input_State :: struct {
    // store keys
}

Input_Event_Callbacks :: struct {
    key_down: proc(e: js.Event),
    key_up: proc(e: js.Event),
}

init_input :: proc(input: ^Input_State, callbacks := DEFAULT_INPUT_EVENT_CALLBACKS) {
    js.add_document_event_listener(js.Event_Kind.Key_Down, input, callbacks.key_down)
    js.add_document_event_listener(js.Event_Kind.Key_Up, input, callbacks.key_up)
}

register_key_down_callback :: proc(event: js.Event) {
    log.infof("Key down: %s", event.key.key)
}

register_key_up_callback :: proc(event: js.Event) {
    d := get_user_data_as(Input_State, event)
    log.infof("Key up: %s", event.key.key)
}

get_user_data_as :: proc($T: typeid, e: js.Event) -> ^T {
    return cast(^T)e.user_data
}