/* app.c — 图库装配层：main + 建页 + meow_ui_run 回调路由 + 主题监听。
 *
 * 契约（docs/APP_DEV_GUIDE.md §2-§3）：
 *   - main 只做 meow_ui_init → 建 view → meow_ui_run → 清理；退出走 meow_ui_request_exit；
 *   - 页面切换统一走 meow_view_page_push/pop（activity 栈 + on_enter/on_leave 唯一入口）；
 *   - 物理键不映射返回/确认（on_key 仅日志）；屏底上滑由 SDK 系统手势接管，App 不拦截；
 *   - 左缘返回：reader/settings=pop；lock 页自行消费；书库逐级上移，
 *     **TF 根=退出 App**（系统返回语义，不再上溯系统目录）；TF 根以外的上级浏览
 *     走顶栏显式「上级」动作。
 *
 * 主题同步：注册 meow_theme_add_listener；明暗/风格族切换时更新页面底色并整帧 invalidate，
 * 各页 on_draw / SDK 控件下一帧即用新语义色重绘（不缓存颜色）。
 */
#include "tuku_internal.h"
#include "ui/reader/reader.h"
#include "meow_ui_nav.h"

#include <signal.h>

static void on_sigterm(int s)
{
    (void)s;
    meow_ui_request_exit();
}

/* 向 launcher 上报当前页栈深/顶层，供系统导航栈跟随。各页 on_enter 调用。 */
void mr_nav_report(void)
{
    int depth = meow_ui_activity_depth();
    if (depth <= 0) depth = 1;
    int id = meow_ui_activity_active();
    const char *top = (id == ACT_READER)   ? "reader"
                    : (id == ACT_SETTINGS) ? "settings"
                    : (id == ACT_LOCK)     ? "lock"
                                           : "library";
    meow_ui_nav_report((uint32_t)depth, top);
}

/* 主题切换：页面底色 + 整帧重绘（控件与 on_draw 全部从 meow_theme_get() 取色）。 */
static void app_theme_changed(meow_theme_mode m)
{
    (void)m;
    meow_ui_set_page_bg(meow_theme_get()->bg);
    meow_ui_invalidate(0, 0, meow_ui_width(), meow_ui_height());
}

static int app_active(void)
{
    return meow_ui_activity_active();
}

static void app_on_key(int keycode, int is_down)
{
    (void)keycode; (void)is_down;   /* 物理键是系统语义，不做返回/确认映射 */
    meow_log(MEOW_LOG_DEBUG, "key");
}

static void app_on_tap(int x, int y)
{
    switch (app_active()) {
    case ACT_LIBRARY:  library_on_tap(x, y); break;
    case ACT_READER:   reader_on_tap(x, y); break;
    default: break;
    }
}

static void app_on_swipe(int dir, int dx, int dy)
{
    (void)dy;
    if (dir == MEOW_SWIPE_LEFT) {
        if (app_active() == ACT_LIBRARY) {
            if (!library_go_up()) {
                meow_log(MEOW_LOG_INFO, "exit:swipe");
                meow_ui_request_exit();
            }
        } else {
            meow_view_page_pop();
        }
        return;
    }
    /* SDK 的 on_swipe 把位移量放在第二参（第三参为 0）：UP/DOWN 时 dx=纵向位移。 */
    if (app_active() == ACT_LIBRARY) library_on_swipe(dir, dx);
}

static void app_on_tick(void)
{
    library_on_tick();
}

static void app_on_swipe_progress(int x_start, int dx)
{
    meow_ui_swipe_hint(x_start + dx);
}

/* 跟手拖动路由（M6）：ACT_READER 需要原始 down/move 算位移；其余页保持原语义。
 * 屏底热区/左缘的避让由 reader 侧按同一口径判断（reader_on_touch_down）。 */
static void app_on_touch_down(int x, int y)
{
    if (app_active() == ACT_LIBRARY) library_on_touch_down(x, y);
    else if (app_active() == ACT_READER) reader_on_touch_down(x, y);
}

static void app_on_touch_move(int x, int y)
{
    if (app_active() == ACT_LIBRARY) library_on_touch_move(x, y);
    else if (app_active() == ACT_READER) reader_on_touch_move(x, y);
}

int main(void)
{
    meow_log(MEOW_LOG_INFO, "start");
    meow_ui_opts o = { 480, 720 };
    if (meow_ui_init(&o) != 0) {
        meow_log(MEOW_LOG_ERROR, "init failed");
        return 1;
    }

    meow_theme_add_listener(app_theme_changed);
    meow_ui_set_page_bg(meow_theme_get()->bg);
    meow_ui_nav_init();
    signal(SIGTERM, on_sigterm);

    /* 先建全部页面（on_create 建各自控件/扫描书库），再按启动锁状态进根页。 */
    meow_view *library   = library_view_create();
    meow_view *reader    = reader_view_create();
    meow_view *settings  = settings_view_create();
    meow_view *lock      = lock_view_create();

    meow_view_page_push(lock_view_should_show() ? ACT_LOCK : ACT_LIBRARY);

    meow_ui_events ev = {
        app_on_key, app_on_tap, app_on_swipe, app_on_tick,
        app_on_swipe_progress, app_on_touch_down, app_on_touch_move,
    };
    meow_ui_run(&ev);

    meow_view_free(lock);
    meow_view_free(settings);
    meow_view_free(reader);
    meow_view_free(library);
    meow_ui_shutdown();
    meow_log(MEOW_LOG_INFO, "exit");
    return 0;
}