#include "view_dispatcher_i.h"

ViewDispatcher* view_dispatcher_alloc() {
    ViewDispatcher* view_dispatcher = furi_alloc(sizeof(ViewDispatcher));

    view_dispatcher->view_port = view_port_alloc();
    view_port_draw_callback_set(
        view_dispatcher->view_port, view_dispatcher_draw_callback, view_dispatcher);
    view_port_input_callback_set(
        view_dispatcher->view_port, view_dispatcher_input_callback, view_dispatcher);
    view_port_enabled_set(view_dispatcher->view_port, false);

    ViewDict_init(view_dispatcher->views);

    return view_dispatcher;
}

void view_dispatcher_free(ViewDispatcher* view_dispatcher) {
    // Detach from gui
    if(view_dispatcher->gui) {
        gui_remove_view_port(view_dispatcher->gui, view_dispatcher->view_port);
    }
    // Crash if not all views were freed
    furi_assert(ViewDict_size(view_dispatcher->views) == 0);

    ViewDict_clear(view_dispatcher->views);
    // Free ViewPort
    view_port_free(view_dispatcher->view_port);
    // Free internal queue
    if(view_dispatcher->queue) {
        osMessageQueueDelete(view_dispatcher->queue);
    }
    // Free dispatcher
    free(view_dispatcher);
}

void view_dispatcher_enable_queue(ViewDispatcher* view_dispatcher) {
    furi_assert(view_dispatcher);
    furi_assert(view_dispatcher->queue == NULL);
    view_dispatcher->queue = osMessageQueueNew(8, sizeof(ViewDispatcherMessage), NULL);
}

void view_dispatcher_set_event_callback_context(ViewDispatcher* view_dispatcher, void* context) {
    furi_assert(view_dispatcher);
    view_dispatcher->event_context = context;
}

void view_dispatcher_set_navigation_event_callback(
    ViewDispatcher* view_dispatcher,
    ViewDispatcherNavigationEventCallback callback) {
    furi_assert(view_dispatcher);
    furi_assert(callback);
    view_dispatcher->navigation_event_callback = callback;
}

void view_dispatcher_set_custom_event_callback(
    ViewDispatcher* view_dispatcher,
    ViewDispatcherCustomEventCallback callback) {
    furi_assert(view_dispatcher);
    furi_assert(callback);
    view_dispatcher->custom_event_callback = callback;
}

void view_dispatcher_set_tick_event_callback(
    ViewDispatcher* view_dispatcher,
    ViewDispatcherTickEventCallback callback,
    uint32_t tick_period) {
    furi_assert(view_dispatcher);
    furi_assert(callback);
    view_dispatcher->tick_event_callback = callback;
    view_dispatcher->tick_period = tick_period;
}

void view_dispatcher_run(ViewDispatcher* view_dispatcher) {
    furi_assert(view_dispatcher);
    furi_assert(view_dispatcher->queue);

    uint32_t tick_period = view_dispatcher->tick_period == 0 ? osWaitForever :
                                                               view_dispatcher->tick_period;
    ViewDispatcherMessage message;
    while(1) {
        if(osMessageQueueGet(view_dispatcher->queue, &message, NULL, tick_period) != osOK) {
            view_dispatcher_handle_tick_event(view_dispatcher);
            continue;
        }
        if(message.type == ViewDispatcherMessageTypeStop) {
            break;
        } else if(message.type == ViewDispatcherMessageTypeInput) {
            view_dispatcher_handle_input(view_dispatcher, &message.input);
        } else if(message.type == ViewDispatcherMessageTypeCustomEvent) {
            view_dispatcher_handle_custom_event(view_dispatcher, message.custom_event);
        }
    }

    // Wait till all input events delivered
    while(view_dispatcher->ongoing_input_events_count > 0) {
        osMessageQueueGet(view_dispatcher->queue, &message, NULL, osWaitForever);
        if(message.type == ViewDispatcherMessageTypeInput) {
            if(message.input.type == InputTypePress) {
                view_dispatcher->ongoing_input_events_count++;
            } else if(message.input.type == InputTypeRelease) {
                view_dispatcher->ongoing_input_events_count--;
            }
        }
    }
}

void view_dispatcher_stop(ViewDispatcher* view_dispatcher) {
    furi_assert(view_dispatcher);
    furi_assert(view_dispatcher->queue);
    ViewDispatcherMessage message;
    message.type = ViewDispatcherMessageTypeStop;
    furi_check(osMessageQueuePut(view_dispatcher->queue, &message, 0, osWaitForever) == osOK);
}

void view_dispatcher_add_view(ViewDispatcher* view_dispatcher, uint32_t view_id, View* view) {
    furi_assert(view_dispatcher);
    furi_assert(view);
    // Check if view id is not used and register view
    furi_check(ViewDict_get(view_dispatcher->views, view_id) == NULL);

    // Lock gui
    if(view_dispatcher->gui) {
        gui_lock(view_dispatcher->gui);
    }

    ViewDict_set_at(view_dispatcher->views, view_id, view);
    view_set_update_callback(view, view_dispatcher_update);
    view_set_update_callback_context(view, view_dispatcher);

    // Unlock gui
    if(view_dispatcher->gui) {
        gui_unlock(view_dispatcher->gui);
    }
}

void view_dispatcher_remove_view(ViewDispatcher* view_dispatcher, uint32_t view_id) {
    furi_assert(view_dispatcher);

    // Lock gui
    if(view_dispatcher->gui) {
        gui_lock(view_dispatcher->gui);
    }
    // Get View by ID
    View* view = *ViewDict_get(view_dispatcher->views, view_id);

    // Disable the view if it is active
    if(view_dispatcher->current_view == view) {
        view_dispatcher_set_current_view(view_dispatcher, NULL);
    }
    // Remove view
    ViewDict_erase(view_dispatcher->views, view_id);

    view_set_update_callback(view, NULL);
    view_set_update_callback_context(view, NULL);

    // Unlock gui
    if(view_dispatcher->gui) {
        gui_unlock(view_dispatcher->gui);
    }
}

void view_dispatcher_switch_to_view(ViewDispatcher* view_dispatcher, uint32_t view_id) {
    furi_assert(view_dispatcher);
    if(view_id == VIEW_NONE) {
        view_dispatcher_set_current_view(view_dispatcher, NULL);
    } else if(view_id == VIEW_IGNORE) {
    } else {
        View** view_pp = ViewDict_get(view_dispatcher->views, view_id);
        furi_check(view_pp != NULL);
        if(view_dispatcher->ongoing_input_events_count > 0) {
            view_dispatcher->delayed_next_view = *view_pp;
        } else {
            view_dispatcher->delayed_next_view = NULL;
            view_dispatcher_set_current_view(view_dispatcher, *view_pp);
        }
    }
}

void view_dispatcher_attach_to_gui(
    ViewDispatcher* view_dispatcher,
    Gui* gui,
    ViewDispatcherType type) {
    furi_assert(view_dispatcher);
    furi_assert(view_dispatcher->gui == NULL);
    furi_assert(gui);

    if(type == ViewDispatcherTypeNone) {
        gui_add_view_port(gui, view_dispatcher->view_port, GuiLayerNone);
    } else if(type == ViewDispatcherTypeFullscreen) {
        gui_add_view_port(gui, view_dispatcher->view_port, GuiLayerFullscreen);
    } else if(type == ViewDispatcherTypeWindow) {
        gui_add_view_port(gui, view_dispatcher->view_port, GuiLayerMain);
    } else {
        furi_check(NULL);
    }
    view_dispatcher->gui = gui;
}

void view_dispatcher_draw_callback(Canvas* canvas, void* context) {
    ViewDispatcher* view_dispatcher = context;
    if(view_dispatcher->current_view) {
        view_draw(view_dispatcher->current_view, canvas);
    }
}

void view_dispatcher_input_callback(InputEvent* event, void* context) {
    ViewDispatcher* view_dispatcher = context;
    if(view_dispatcher->queue) {
        ViewDispatcherMessage message;
        message.type = ViewDispatcherMessageTypeInput;
        message.input = *event;
        furi_check(osMessageQueuePut(view_dispatcher->queue, &message, 0, osWaitForever) == osOK);
    } else {
        view_dispatcher_handle_input(view_dispatcher, event);
    }
}

void view_dispatcher_handle_input(ViewDispatcher* view_dispatcher, InputEvent* event) {
    // Ongoing input events counting
    if(event->type == InputTypeRelease && view_dispatcher->ongoing_input_events_count > 0) {
        view_dispatcher->ongoing_input_events_count--;
    } else if(event->type == InputTypePress) {
        view_dispatcher->ongoing_input_events_count++;
    } else if(view_dispatcher->ongoing_input_events_count == 0) {
        FURI_LOG_E("ViewDispatcher", "non-complementary input, discarding");
        return;
    }

    bool is_consumed = false;
    if(view_dispatcher->current_view) {
        is_consumed = view_input(view_dispatcher->current_view, event);
    }
    if(!is_consumed && event->type == InputTypeShort) {
        // TODO remove view navigation handlers
        uint32_t view_id = VIEW_IGNORE;
        if(event->key == InputKeyBack) {
            view_id = view_previous(view_dispatcher->current_view);
            if((view_id == VIEW_IGNORE) && (view_dispatcher->navigation_event_callback)) {
                is_consumed =
                    view_dispatcher->navigation_event_callback(view_dispatcher->event_context);
                if(!is_consumed) {
                    view_dispatcher_stop(view_dispatcher);
                    return;
                }
            }
        }
        if(!is_consumed) {
            view_dispatcher_switch_to_view(view_dispatcher, view_id);
        }
    }

    // Delayed view switch
    if(view_dispatcher->delayed_next_view && view_dispatcher->ongoing_input_events_count == 0) {
        view_dispatcher_set_current_view(view_dispatcher, view_dispatcher->delayed_next_view);
        view_dispatcher->delayed_next_view = NULL;
    }
}

void view_dispatcher_handle_tick_event(ViewDispatcher* view_dispatcher) {
    if(view_dispatcher->tick_event_callback) {
        view_dispatcher->tick_event_callback(view_dispatcher->event_context);
    }
}

void view_dispatcher_handle_custom_event(ViewDispatcher* view_dispatcher, uint32_t event) {
    bool is_consumed = false;
    if(view_dispatcher->current_view) {
        is_consumed = view_custom(view_dispatcher->current_view, event);
    }
    // If custom event is not consumed in View, call callback
    if(!is_consumed && view_dispatcher->custom_event_callback) {
        is_consumed =
            view_dispatcher->custom_event_callback(view_dispatcher->event_context, event);
    }
}

void view_dispatcher_send_custom_event(ViewDispatcher* view_dispatcher, uint32_t event) {
    furi_assert(view_dispatcher);
    furi_assert(view_dispatcher->queue);

    ViewDispatcherMessage message;
    message.type = ViewDispatcherMessageTypeCustomEvent;
    message.custom_event = event;

    furi_check(osMessageQueuePut(view_dispatcher->queue, &message, 0, osWaitForever) == osOK);
}

void view_dispatcher_set_current_view(ViewDispatcher* view_dispatcher, View* view) {
    furi_assert(view_dispatcher);
    // Dispatch view exit event
    if(view_dispatcher->current_view) {
        view_exit(view_dispatcher->current_view);
    }
    // Set current view
    view_dispatcher->current_view = view;
    // Dispatch view enter event
    if(view_dispatcher->current_view) {
        if(view->orientation == ViewOrientationVertical)
            view_port_set_orientation(view_dispatcher->view_port, ViewPortOrientationVertical);
        else if(view->orientation == ViewOrientationHorizontal)
            view_port_set_orientation(view_dispatcher->view_port, ViewPortOrientationHorizontal);
        view_enter(view_dispatcher->current_view);
        view_port_enabled_set(view_dispatcher->view_port, true);
        view_port_update(view_dispatcher->view_port);
    } else {
        view_port_enabled_set(view_dispatcher->view_port, false);
        if(view_dispatcher->queue) {
            view_dispatcher_stop(view_dispatcher);
        }
    }
}

void view_dispatcher_update(View* view, void* context) {
    furi_assert(view);
    furi_assert(context);

    ViewDispatcher* view_dispatcher = context;

    if(view_dispatcher->current_view == view) {
        view_port_update(view_dispatcher->view_port);
    }
}