/* ui/reader/reader.c — 阅读器页（ACT_READER，全屏）M3 骨架。
 *
 * M4 在此实现翻页/图片显示；本批只落可编译桩 + 既有接缝：
 *   - 书库经 mr_reader_open_dir(path) 导航进来（app.c/library.c 不改）；
 *   - 方向状态走 logic/reader 的 mr_reader_get/set_direction（默认 RTL）。
 * 绘制走 view on_draw（注册表驱动），主题切换由 app.c 的 listener invalidate 全屏重画。
 */
#include "tuku_internal.h"

#include <stdio.h>
#include <string.h>

static mr_page_ctrl g_ctrl;
static char g_dir[MR_PATH_MAX];

const char *mr_reader_dir(void)
{
    return g_dir;
}

void mr_reader_open_dir(const char *path)
{
    if (!path) return;
    snprintf(g_dir, sizeof g_dir, "%s", path);
    meow_log(MEOW_LOG_INFO, "reader open: %s", g_dir);
    meow_view_page_push(ACT_READER);
}

void reader_on_tap(int x, int y)
{
    (void)x; (void)y;
    if (!g_ctrl.active) return;
    mr_reader_set_direction(mr_reader_get_direction() == MR_DIR_RTL ? MR_DIR_LTR : MR_DIR_RTL);
    meow_ui_invalidate(0, 0, meow_ui_width(), meow_ui_height());
}

static void reader_draw(meow_view *v, const meow_theme *th, void *ctx)
{
    (void)v; (void)ctx;
    int w = meow_ui_width();
    const char *dir = g_dir[0] ? g_dir : "(no directory)";
    size_t n = strlen(dir);
    if (n > 64) dir += n - 64;

    meow_ui_text_center(w / 2, 160, "READER", th->font_title, th->primary);
    meow_ui_text_center(w / 2, 200, "(M4 will render pages here)", th->font_body,
                        th->onSurfaceVariant);
    meow_ui_text_center(w / 2, 280, "Folder:", th->font_body, th->onSurfaceVariant);
    meow_ui_text_center(w / 2, 308, dir, th->font_body, th->onSurface);
    meow_ui_text_center(w / 2, 372,
                        mr_reader_get_direction() == MR_DIR_RTL ? "Direction: RTL" : "Direction: LTR",
                        th->font_body, th->onSurface);
    meow_ui_text_center(w / 2, 420, "tap = toggle direction", th->font_body, th->onSurfaceVariant);
    meow_ui_text_center(w / 2, 448, "left-edge swipe = back", th->font_body, th->onSurfaceVariant);
}

static void reader_page_enter(meow_view *v, void *ctx)
{
    ((mr_page_ctrl *)ctx)->active = 1;
    v->x = 0;
    v->y = 0;
    v->w = meow_ui_width();
    v->h = meow_ui_height();
    meow_ui_set_fullscreen(1);                 /* app.json route.reader.fullscreen 的运行时兜底 */
    meow_ui_set_page_bg(meow_theme_get()->bg);
    mr_nav_report();
    meow_ui_paint_full();
}

static void reader_page_leave(meow_view *v, void *ctx)
{
    (void)v;
    ((mr_page_ctrl *)ctx)->active = 0;
    meow_ui_set_fullscreen(0);
}

meow_view *reader_view_create(void)
{
    static const meow_view_hooks h = {
        .on_enter = reader_page_enter,
        .on_leave = reader_page_leave,
        .on_draw  = reader_draw,
    };
    return meow_view_create(ACT_READER, MEOW_VIEW_ACTIVITY, &h, &g_ctrl);
}