#include "gui_i.h"

ViewPort* gui_view_port_find_enabled(ViewPortArray_t array) {
    // Iterating backward
    ViewPortArray_it_t it;
    ViewPortArray_it_last(it, array);
    while(!ViewPortArray_end_p(it)) {
        ViewPort* view_port = *ViewPortArray_ref(it);
        if(view_port_is_enabled(view_port)) {
            return view_port;
        }
        ViewPortArray_previous(it);
    }
    return NULL;
}

void gui_update(Gui* gui, ViewPort* view_port) {
    furi_assert(gui);
    if(view_port) {
        // Visibility check
        gui_lock(gui);
        for(size_t i = 0; i < GuiLayerMAX; i++) {
            if(gui_view_port_find_enabled(gui->layers[i]) == view_port) {
                osThreadFlagsSet(gui->thread, GUI_THREAD_FLAG_DRAW);
                break;
            }
        }
        gui_unlock(gui);
    } else {
        osThreadFlagsSet(gui->thread, GUI_THREAD_FLAG_DRAW);
    }
}

void gui_input_events_callback(const void* value, void* ctx) {
    furi_assert(value);
    furi_assert(ctx);

    Gui* gui = ctx;

    osMessageQueuePut(gui->input_queue, value, 0, osWaitForever);
    osThreadFlagsSet(gui->thread, GUI_THREAD_FLAG_INPUT);
}

bool gui_redraw_fs(Gui* gui) {
    canvas_frame_set(gui->canvas, 0, 0, GUI_DISPLAY_WIDTH, GUI_DISPLAY_HEIGHT);
    ViewPort* view_port = gui_view_port_find_enabled(gui->layers[GuiLayerFullscreen]);
    if(view_port) {
        view_port_draw(view_port, gui->canvas);
        return true;
    } else {
        return false;
    }
}

void gui_redraw_status_bar(Gui* gui) {
    ViewPortArray_it_t it;
    uint8_t x;
    uint8_t x_used = 0;
    uint8_t width;
    ViewPort* view_port;
    // Right side
    x = 128;
    ViewPortArray_it(it, gui->layers[GuiLayerStatusBarRight]);
    while(!ViewPortArray_end_p(it) && x_used < GUI_STATUS_BAR_WIDTH) {
        // Render view_port;
        view_port = *ViewPortArray_ref(it);
        if(view_port_is_enabled(view_port)) {
            width = view_port_get_width(view_port);
            if(!width) width = 8;
            x_used += width;
            x -= (width + 2);
            canvas_frame_set(gui->canvas, x, GUI_STATUS_BAR_Y, width, GUI_STATUS_BAR_HEIGHT);
            view_port_draw(view_port, gui->canvas);
        }
        ViewPortArray_next(it);
    }
    // Left side
    x = 0;
    ViewPortArray_it(it, gui->layers[GuiLayerStatusBarLeft]);
    while(!ViewPortArray_end_p(it) && x_used < GUI_STATUS_BAR_WIDTH) {
        // Render view_port;
        view_port = *ViewPortArray_ref(it);
        if(view_port_is_enabled(view_port)) {
            width = view_port_get_width(view_port);
            if(!width) width = 8;
            x_used += width;
            canvas_frame_set(gui->canvas, x, GUI_STATUS_BAR_Y, width, GUI_STATUS_BAR_HEIGHT);
            view_port_draw(view_port, gui->canvas);
            x += (width + 2);
        }
        ViewPortArray_next(it);
    }
}

bool gui_redraw_normal(Gui* gui) {
    canvas_frame_set(gui->canvas, GUI_MAIN_X, GUI_MAIN_Y, GUI_MAIN_WIDTH, GUI_MAIN_HEIGHT);
    ViewPort* view_port = gui_view_port_find_enabled(gui->layers[GuiLayerMain]);
    if(view_port) {
        view_port_draw(view_port, gui->canvas);
        return true;
    }
    return false;
}

bool gui_redraw_none(Gui* gui) {
    canvas_frame_set(gui->canvas, GUI_MAIN_X, GUI_MAIN_Y, GUI_MAIN_WIDTH, GUI_MAIN_HEIGHT);
    ViewPort* view_port = gui_view_port_find_enabled(gui->layers[GuiLayerNone]);
    if(view_port) {
        view_port_draw(view_port, gui->canvas);
        return true;
    }

    return false;
}

void gui_redraw(Gui* gui) {
    furi_assert(gui);
    gui_lock(gui);

    canvas_reset(gui->canvas);

    if(!gui_redraw_fs(gui)) {
        if(!gui_redraw_normal(gui)) {
            gui_redraw_none(gui);
        }
        gui_redraw_status_bar(gui);
    }

    canvas_commit(gui->canvas);
    gui_unlock(gui);
}

void gui_input(Gui* gui, InputEvent* input_event) {
    furi_assert(gui);
    furi_assert(input_event);

    gui_lock(gui);

    ViewPort* view_port;

    view_port = gui_view_port_find_enabled(gui->layers[GuiLayerFullscreen]);
    if(!view_port) view_port = gui_view_port_find_enabled(gui->layers[GuiLayerMain]);
    if(!view_port) view_port = gui_view_port_find_enabled(gui->layers[GuiLayerNone]);

    if(view_port) {
        view_port_input(view_port, input_event);
    }

    gui_unlock(gui);
}

void gui_lock(Gui* gui) {
    furi_assert(gui);
    furi_check(osMutexAcquire(gui->mutex, osWaitForever) == osOK);
}

void gui_unlock(Gui* gui) {
    furi_assert(gui);
    furi_check(osMutexRelease(gui->mutex) == osOK);
}

void gui_add_view_port(Gui* gui, ViewPort* view_port, GuiLayer layer) {
    furi_assert(gui);
    furi_assert(view_port);
    furi_check(layer < GuiLayerMAX);

    gui_lock(gui);
    // Verify that view port is not yet added
    ViewPortArray_it_t it;
    for(size_t i = 0; i < GuiLayerMAX; i++) {
        ViewPortArray_it(it, gui->layers[i]);
        while(!ViewPortArray_end_p(it)) {
            furi_assert(*ViewPortArray_ref(it) != view_port);
            ViewPortArray_next(it);
        }
    }
    // Add view port and link with gui
    ViewPortArray_push_back(gui->layers[layer], view_port);
    view_port_gui_set(view_port, gui);
    gui_unlock(gui);

    gui_update(gui, NULL);
}

void gui_remove_view_port(Gui* gui, ViewPort* view_port) {
    furi_assert(gui);
    furi_assert(view_port);

    gui_lock(gui);

    view_port_gui_set(view_port, NULL);
    ViewPortArray_it_t it;
    for(size_t i = 0; i < GuiLayerMAX; i++) {
        ViewPortArray_it(it, gui->layers[i]);
        while(!ViewPortArray_end_p(it)) {
            if(*ViewPortArray_ref(it) == view_port) {
                ViewPortArray_remove(gui->layers[i], it);
            } else {
                ViewPortArray_next(it);
            }
        }
    }

    gui_unlock(gui);
}

void gui_send_view_port_front(Gui* gui, ViewPort* view_port) {
    furi_assert(gui);
    furi_assert(view_port);

    gui_lock(gui);
    // Remove
    GuiLayer layer = GuiLayerMAX;
    ViewPortArray_it_t it;
    for(size_t i = 0; i < GuiLayerMAX; i++) {
        ViewPortArray_it(it, gui->layers[i]);
        while(!ViewPortArray_end_p(it)) {
            if(*ViewPortArray_ref(it) == view_port) {
                ViewPortArray_remove(gui->layers[i], it);
                furi_assert(layer == GuiLayerMAX);
                layer = i;
            } else {
                ViewPortArray_next(it);
            }
        }
    }
    furi_assert(layer != GuiLayerMAX);
    // Return to the top
    ViewPortArray_push_back(gui->layers[layer], view_port);
    gui_unlock(gui);
}

void gui_send_view_port_back(Gui* gui, ViewPort* view_port) {
    furi_assert(gui);
    furi_assert(view_port);

    gui_lock(gui);
    // Remove
    GuiLayer layer = GuiLayerMAX;
    ViewPortArray_it_t it;
    for(size_t i = 0; i < GuiLayerMAX; i++) {
        ViewPortArray_it(it, gui->layers[i]);
        while(!ViewPortArray_end_p(it)) {
            if(*ViewPortArray_ref(it) == view_port) {
                ViewPortArray_remove(gui->layers[i], it);
                furi_assert(layer == GuiLayerMAX);
                layer = i;
            } else {
                ViewPortArray_next(it);
            }
        }
    }
    furi_assert(layer != GuiLayerMAX);
    // Return to the top
    ViewPortArray_push_at(gui->layers[layer], 0, view_port);
    gui_unlock(gui);
}

Gui* gui_alloc() {
    Gui* gui = furi_alloc(sizeof(Gui));
    // Thread ID
    gui->thread = osThreadGetId();
    gui->mutex_attr.name = "mtx_gui";
    gui->mutex_attr.attr_bits |= osMutexRecursive;
    // Allocate mutex
    gui->mutex = osMutexNew(&gui->mutex_attr);
    furi_check(gui->mutex);
    // Layers
    for(size_t i = 0; i < GuiLayerMAX; i++) {
        ViewPortArray_init(gui->layers[i]);
    }
    // Drawing canvas
    gui->canvas = canvas_init();
    // Input
    gui->input_queue = osMessageQueueNew(8, sizeof(InputEvent), NULL);
    gui->input_events = furi_record_open("input_events");
    furi_check(gui->input_events);
    subscribe_pubsub(gui->input_events, gui_input_events_callback, gui);

    return gui;
}

int32_t gui_task(void* p) {
    Gui* gui = gui_alloc();

    furi_record_create("gui", gui);

    while(1) {
        uint32_t flags = osThreadFlagsWait(GUI_THREAD_FLAG_ALL, osFlagsWaitAny, osWaitForever);
        // Process and dispatch input
        if(flags & GUI_THREAD_FLAG_INPUT) {
            // Process till queue become empty
            InputEvent input_event;
            while(osMessageQueueGet(gui->input_queue, &input_event, NULL, 0) == osOK) {
                gui_input(gui, &input_event);
            }
        }
        // Process and dispatch draw call
        if(flags & GUI_THREAD_FLAG_DRAW) {
            // Clear flags that arrived on input step
            osThreadFlagsClear(GUI_THREAD_FLAG_DRAW);
            gui_redraw(gui);
        }
    }

    return 0;
}