/* ui/home.c — 我的音乐页（ACT_HOME，根页，已登录）。
 *
 * 网易云风格（NCM_UI_DESIGN §4.2）：红系 topbar（标题「我的音乐」+搜索/刷新/设置动作）+
 * 个人区卡片（头像/昵称/ID）+ 双页签「我创建的/我收藏的」（meow_tabbar + 各自 meow_listview）+
 * 组头红条 + 歌单行（rounded card + 红 mini-vinyl 缩略 + 红色按压竖条）。
 *
 * 品牌红走 ncm_palette(g_dark)（App 无权改 SDK MD3 蓝 primary），代码零硬编码散落：
 * 中性色读 meow_theme_get()，红读 ncm_palette()。SDK listview 的 MD3 蓝选中不可改，
 * 故用 MEOW_LIST_SEL_NONE + 自定义红态叠层（§4.2 叠加红条）。
 *
 * 左缘返回 = 退出 App（app.c）。歌单加载后台 worker（home_worker，保留 REPORT §10.11
 * 的异步结构，不回退成同步——P1 启动卡顿已修，勿回退）。
 */
#include "../ncm_app_internal.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <pthread.h>

typedef struct { meow_view *view; int active; } home_ctrl;
static home_ctrl g_hc;

static meow_widget *g_tb, *g_list, *g_tabs;
static ncm_rect_t   r_cont, r_list, r_tabs, r_group;
static int          g_bg_id, g_draw_id, g_empty_id, g_footer_id;
static volatile int g_load_err;
static int          g_tab;      /* 0=我创建的 1=我收藏的 */
static int          g_press_row, g_press_delta, g_dragging, g_drag_last_y;

/* 歌单加载后台 worker（P1：从 UI 线程挪出，gen 代数做完成信号）。 */
static pthread_mutex_t g_home_mu = PTHREAD_MUTEX_INITIALIZER;
static pthread_t       g_home_thr;
static int             g_home_thr_on;
static volatile int    g_home_gen;
static int             g_home_acked;
static volatile int    g_home_loading;

static const char *tab_label(int tab) { return tab ? "我收藏的" : "我创建的"; }

/* ---- tab 数据子集（is_collected 过滤）---- */
static int tab_count(int tab)
{
    int c = 0;
    for (int i = 0; i < g_st.playlist_count; i++)
        if ((g_st.playlists[i].is_collected != 0) == (tab == 1)) c++;
    return c;
}
static int tab_global_idx(int tab, int k)
{
    int c = 0;
    for (int i = 0; i < g_st.playlist_count; i++)
        if ((g_st.playlists[i].is_collected != 0) == (tab == 1)) {
            if (c == k) return i;
            c++;
        }
    return -1;
}

static void home_drag_reset(void)
{
    g_press_row = -1; g_press_delta = 0; g_dragging = 0; g_drag_last_y = 0;
}

static int home_src2(int idx, meow_list_item *out, void *ctx)
{
    (void)ctx;
    int gi = tab_global_idx(g_tab, idx);
    if (gi < 0) return 0;
    ncm_playlist_t *pl = &g_st.playlists[gi];
    static char title[128], sub[64];
    snprintf(title, sizeof title, "%s", pl->name);
    snprintf(sub, sizeof sub, "%d 首", pl->track_count);
    out->icon_kind = MEOW_LIST_ICON_NONE;      /* 图标槽由红 overlays 画迷你黑胶 */
    out->title = title;
    out->subtitle = sub;
    out->right  = MEOW_LIST_RIGHT_ARROW;
    out->on = 0; out->enabled = 1;
    return 1;
}

/* ---- 歌单行 rounded card 背景（z=5，画在 listview 文本之下）---- */
static void home_row_bg(void *ctx)
{
    (void)ctx;
    if (meow_ui_activity_active() != ACT_HOME) return;
    if (g_load_err != 0 || g_st.playlist_count == 0) return;
    const meow_theme *th = meow_theme_get();
    int item  = APP_ROW_H;
    int off   = meow_listview_scroll(g_list);
    int first = off / item, last = (off + r_list.h) / item + 1;
    int n = tab_count(g_tab);
    if (last > n) last = n;
    for (int i = first; i < last; i++) {
        int ry = r_list.y + (i * item - off) + 1, th2 = item - 2;
        if (ry < r_list.y || ry + th2 > r_list.y + r_list.h) continue;   /* 只画完整落在视口内的行 */
        ncm_fill_round(r_list.x, ry, r_list.w, th2, 12, th->surfaceContainer);
    }
}

/* ---- 主绘制（z=60）：个人卡/组头红条/tab 红态/行缩略与按压红条，>listview 红态叠层 ---- */
static void home_draw(void *ctx)
{
    (void)ctx;
    if (meow_ui_activity_active() != ACT_HOME) return;
    const meow_theme *th = meow_theme_get();
    const ncm_pal_t *pa  = ncm_palette(g_dark);
    int w = r_cont.w;

    /* 个人区·卡片（16, y0, w-32, 72）：圆角 16 surfaceContainer。 */
    ncm_rect_t pc = NR(16, r_cont.y + 8, w - 32, 72);
    ncm_fill_round(pc.x, pc.y, pc.w, pc.h, 16, th->surfaceContainer);
    int asz = 40, ax = pc.x + 16, acy = pc.y + (pc.h - asz) / 2;
    ncm_fill_round(ax, acy, asz, asz, asz / 2, pa->red_ctr);   /* 圆形头像底 */
    char glyph[8];
    int gn = first_glyph(g_st.nickname, glyph, sizeof glyph);
    if (!gn) snprintf(glyph, sizeof glyph, "\u266a");          /* ♪ 无昵称占位 */
    meow_ui_text_center(ax + asz / 2, acy + (asz - th->font_body) / 2, glyph, th->font_body, pa->red);
    char idtxt[64];
    snprintf(idtxt, sizeof idtxt, "ID: %s", g_st.uid[0] ? g_st.uid : "-");
    meow_ui_text(pc.x + asz + 28, pc.y + 6, g_st.nickname[0] ? g_st.nickname : "我的歌单",
                 th->font_body, th->onSurface);
    meow_ui_text(pc.x + asz + 28, pc.y + 6 + th->font_body + 4, idtxt, th->font_body, th->onSurfaceVariant);
    meow_ui_text_right(pc.x + pc.w - 16, pc.y + (pc.h - 28) / 2, ">", 28, th->onSurfaceVariant);

    /* 双页签（g_tabs=meow_tabbar widget 建）——红下划线/红选中字叠层。 */
    if (g_tabs) {
        int iw = r_tabs.w / 2;
        int ay = r_tabs.y + (r_tabs.h - meow_ui_text_height(th->font_body)) / 2;
        meow_ui_fill_rect(r_tabs.x + g_tab * iw, r_tabs.y + r_tabs.h - 2, iw, 2, pa->red);
        meow_ui_text_center(r_tabs.x + g_tab * iw + iw / 2, ay, tab_label(g_tab), th->font_body, pa->red);
    }

    /* 组头红条（red_ctr 底 + 红字 + 红侧条）。 */
    ncm_fill_round(r_group.x, r_group.y, r_group.w, r_group.h, 8, pa->red_ctr);
    meow_ui_fill_rect(r_group.x, r_group.y + 4, 4, r_group.h - 8, pa->red);
    char ght[64];
    snprintf(ght, sizeof ght, "%s / %d 个", tab_label(g_tab), tab_count(g_tab));
    meow_ui_text(r_group.x + 16, r_group.y + (r_group.h - th->font_body) / 2,
                 ght, th->font_body, pa->red);
    meow_ui_text_right(r_group.x + r_group.w - 16, r_group.y + (r_group.h - th->font_body) / 2,
                       "+ 新建", th->font_body, pa->red);

    /* 歌单行：红 mini-vinyl 缩略 + 按压红条（文本由 listview 画在 z=10）。 */
    if (g_load_err == 0 && g_st.playlist_count > 0) {
        int item  = APP_ROW_H;
        int off   = meow_listview_scroll(g_list);
        int isz   = 24;
        int first = off / item, last = (off + r_list.h) / item + 1;
        int n = tab_count(g_tab);
        if (last > n) last = n;
        for (int i = first; i < last; i++) {
            int ry = r_list.y + (i * item - off) + 1, th2 = item - 2;
            if (ry < r_list.y || ry + th2 > r_list.y + r_list.h) continue;
            int icy = ry + (item - isz) / 2;
            int bx = r_list.x + 16;
            ncm_fill_round(bx, icy, isz, isz, 6, pa->red);
            meow_ui_fill_rect(bx + isz / 2 - 2, icy + isz / 2 - 2, 4, 4, pa->on_red); /* 盘芯 */
            if (g_press_row == i) {
                meow_ui_fill_rect(r_list.x, ry, 4, item - 2, pa->red);
                meow_ui_fill_rect_alpha(r_list.x, ry, r_list.w, item - 2, pa->red, 26);
            }
        }
    }
}

/* 空态 / 错误 / LOADING。 */
static void home_draw_empty(void *ctx)
{
    (void)ctx;
    if (meow_ui_activity_active() != ACT_HOME) return;
    if (g_st.playlist_count != 0) return;   /* 有数据（缓存/已载）即显示列表，后台刷新失败不置空 */
    if (g_home_loading) { ncm_draw_empty(r_list, "LOADING", "正在加载歌单..."); return; }
    if (g_st.logged_in == 0)  ncm_draw_empty(r_list, "NOT SIGNED IN", "请先登录");
    else if (g_load_err == NCM_ERR_AUTH) ncm_draw_empty(r_list, "SESSION EXPIRED", "请重新登录");
    else if (g_load_err)      ncm_draw_empty(r_list, "NETWORK ERROR", "上滑重试");
    else                      ncm_draw_empty(r_list, "NO PLAYLISTS", "还没有歌单");
}

static void home_draw_footer(void *ctx)
{
    (void)ctx;
    if (meow_ui_activity_active() != ACT_HOME) return;
    if (g_load_err != 0) return;
    char foot[192];
    snprintf(foot, sizeof foot, "共 %d 个歌单   %s", g_st.playlist_count,
             g_st.nickname[0] ? g_st.nickname : "");
    ncm_draw_footer(r_cont, foot);
}

/* 把当前 tab 子集刷进列表 + 重绘（UI 线程）。 */
static void home_apply(void)
{
    if (g_list) {
        meow_listview_set_count(g_list, tab_count(g_tab));
        meow_listview_set_scroll(g_list, 0);
        meow_listview_set_sel(g_list, -1);
    }
    if (g_tabs) meow_tabbar_set_selected(g_tabs, g_tab);
    const meow_theme *th = meow_theme_get();
    meow_ui_set_page_bg(th->bg);
    meow_ui_paint_full();
}

/* 后台 worker：唯一走网络的地方（ensure_uid + user_playlist）。
 * §26 stale-while-revalidate：网络成功 → appstate_load_playlists 覆写盘缓存 + 更新内存；
 * 失败但有缓存在展示 → 保持缓存列表（g_load_err=0），后台静默不打断（断网可离线浏览）。 */
static void *home_worker(void *arg)
{
    (void)arg;
    int rc;
    if (!g_st.logged_in) rc = NCM_ERR_AUTH;
    else rc = appstate_load_playlists();
    if (rc == NCM_OK)
        account_vip_maybe_refresh(0);   /* §20：超 1 天/到期后各补查一次（worker 线程，不卡 UI） */
    pthread_mutex_lock(&g_home_mu);
    g_load_err = (g_st.playlist_count > 0) ? 0 : rc;   /* 有数据（缓存/已载）即不置错误态 */
    g_home_loading = 0;
    g_home_gen++;
    pthread_mutex_unlock(&g_home_mu);
    return NULL;
}

void home_reload(void)
{
    if (g_host_mock) { g_load_err = 0; home_apply(); return; }
    if (g_home_thr_on) return;
    /* §26：进首页先用磁盘缓存秒渲染（若有），后台 worker 静默刷新；无缓存才显示 LOADING。 */
    int64_t ts = 0;
    int had_cache = (appstate_playlists_cache_load(&ts) == NCM_OK && g_st.playlist_count > 0);
    g_load_err = 0;
    if (!had_cache) {
        g_st.playlist_count = 0;        /* 无缓存 → LOADING 空态 */
        g_home_loading = 1;
    }
    g_home_thr_on = 1;
    if (pthread_create(&g_home_thr, NULL, home_worker, NULL) != 0) {
        g_home_thr_on = 0; g_home_loading = 0; g_load_err = NCM_ERR_IO;
    }
    home_apply();
}

void home_tick(uint64_t now)
{
    (void)now;
    if (!g_home_thr_on) return;
    if (g_home_gen == g_home_acked) return;
    g_home_acked = g_home_gen;
    g_home_thr_on = 0;
    g_home_loading = 0;
    home_apply();
}

int home_is_active(void) { return g_hc.active; }

int home_on_tap(int x, int y)
{
    if (g_tb) {
        int ah = meow_topappbar_hit(g_tb, x, y);
        if (ah == MEOW_TOPBAR_BACK) { home_drag_reset(); return 1; }
        if (ah == 0) { home_drag_reset(); home_reload(); return 1; }        /* 刷新 */
        if (ah == 1) { home_drag_reset(); settings_open(); return 1; }      /* 设置 */
        if (ah >= 2) { home_drag_reset(); search_open(); return 1; }        /* 搜索（最右） */
    }
    if (g_tabs && meow_widget_hit(g_tabs, x, y)) {
        int t = meow_tabbar_hit(g_tabs, x, y);
        if (t >= 0 && t != g_tab) { g_tab = t; home_drag_reset(); home_apply(); }
        return 1;
    }
    if (g_load_err != 0 || g_st.playlist_count == 0) return 0;
    if (meow_widget_hit(g_list, x, y)) {
        /* 误触修复（同 playlist.c）：小拖动滚动列表后 release 被 SDK 判成 TAP，旧命中用“释放点 +
         * 新 scroll”，打到非按下行；改用按下行 g_press_row，移动超阈值（>10）视为滚动不触发。 */
        int was_drag = (g_press_delta > 10);
        int row = (g_press_row >= 0) ? g_press_row : meow_listview_hit(g_list, x, y);
        home_drag_reset();
        if (row < 0 || was_drag) return 1;
        playlist_open(tab_global_idx(g_tab, row));
        return 1;
    }
    return 0;
}

void home_touch_down(int x, int y)
{
    home_drag_reset();
    if (g_load_err != 0 || g_st.playlist_count == 0) return;
    if (meow_widget_hit(g_list, x, y)) {
        int row = meow_listview_hit(g_list, x, y);
        if (row >= 0) g_press_row = row;
        g_dragging = 1; g_drag_last_y = y;
        meow_ui_invalidate(r_list.x, r_list.y, r_list.w, r_list.h);
    }
}

void home_touch_move(int x, int y)
{
    (void)x;
    if (!g_dragging) return;
    if (g_press_row >= 0) {
        int d = y - g_drag_last_y; if (d < 0) d = -d;
        g_press_delta += d;
        if (g_press_delta > 10) g_press_row = -1;
    }
    int dy = y - g_drag_last_y; g_drag_last_y = y;
    if (dy == 0) return;
    int before = meow_listview_scroll(g_list);
    meow_listview_scroll_by(g_list, -dy);
    if (meow_listview_scroll(g_list) != before)
        meow_ui_invalidate(r_list.x, r_list.y, r_list.w, r_list.h);
}

void home_swipe(int dir, int dist)
{
    if (dir != MEOW_SWIPE_UP && dir != MEOW_SWIPE_DOWN) return;
    if (g_load_err != 0 || g_st.playlist_count == 0) return;
    int del = (dir == MEOW_SWIPE_UP) ? dist : -dist;
    int before = meow_listview_scroll(g_list);
    meow_listview_scroll_by(g_list, del);
    if (meow_listview_scroll(g_list) != before)
        meow_ui_invalidate(r_list.x, r_list.y, r_list.w, r_list.h);
}

/* 生命周期 */
static void home_page_create(meow_view *v, void *ctx)
{
    (void)v;
    ((home_ctrl *)ctx)->view = v;
    r_cont = ncm_content_rect();
    ncm_rect_t pc = NR(16, r_cont.y + 8, r_cont.w - 32, 72);
    r_tabs  = NR(16, pc.y + pc.h + 8, r_cont.w - 32, 48);
    r_group = NR(16, r_tabs.y + r_tabs.h + 4, r_cont.w - 32, 36);
    r_list  = NR(16, r_group.y + r_group.h + 8, r_cont.w - 32,
                 r_cont.y + r_cont.h - APP_FOOTER_H - (r_group.y + r_group.h + 8));
    if (r_list.h < 0) r_list.h = 0;
    meow_ui_activity_push(ACT_HOME);   /* owner=ACT_HOME */
    g_tb = ncm_topbar_create("我的音乐", 0, "\xe2\x86\xbb");   /* 刷新(动作0) */
    meow_topappbar_add_action(g_tb, "\xe2\x9a\x99");           /* 设置(动作1) */
    meow_topappbar_add_action(g_tb, "\xe2\x8c\x95");           /* 搜索(动作2, 最右) */
    g_tabs = meow_tabbar_create(r_tabs.x, r_tabs.y, r_tabs.w, r_tabs.h);
    meow_tabbar_add_tab(g_tabs, tab_label(0));
    meow_tabbar_add_tab(g_tabs, tab_label(1));
    meow_tabbar_set_selected(g_tabs, 0);
    g_list = meow_listview_create(r_list.x, r_list.y, r_list.w, r_list.h, 0,
                                  home_src2, NULL, MEOW_LIST_SEL_NONE);
    meow_listview_set_item_h(g_list, APP_ROW_H);
    meow_ui_activity_pop();
    /* 显式 z：行卡片(5) < listview(10) < tabbar(20) < 红态叠层(60) < topbar(999) */
    meow_widget_set_z(g_list, 10);
    meow_widget_set_z(g_tabs, 20);
    g_bg_id = meow_draw_custom_register(5, r_list.x, r_list.y, r_list.w, r_list.h, home_row_bg, NULL);
    g_draw_id = meow_draw_custom_register(60, r_cont.x, r_cont.y, r_cont.w, r_cont.h,
                                          home_draw, NULL);
    g_empty_id = meow_draw_custom_register(1, r_list.x, r_list.y, r_list.w, r_list.h,
                                           home_draw_empty, NULL);
    g_footer_id = meow_draw_custom_register(1, r_cont.x, r_cont.y + r_cont.h - APP_FOOTER_H,
                                            r_cont.w, APP_FOOTER_H, home_draw_footer, NULL);
    home_drag_reset();
}

static void home_page_enter(meow_view *v, void *ctx)
{
    (void)v;
    ((home_ctrl *)ctx)->active = 1;
    const meow_theme *th = meow_theme_get();
    meow_ui_set_page_bg(th->bg);
    home_reload();
}

static void home_page_leave(meow_view *v, void *ctx)
{
    (void)v;
    ((home_ctrl *)ctx)->active = 0;
}

static void home_page_destroy(meow_view *v, void *ctx)
{
    (void)v; (void)ctx;
    if (g_bg_id)    { meow_draw_unregister(g_bg_id);    g_bg_id = 0; }
    if (g_draw_id)  { meow_draw_unregister(g_draw_id);  g_draw_id = 0; }
    if (g_empty_id) { meow_draw_unregister(g_empty_id); g_empty_id = 0; }
    if (g_footer_id){ meow_draw_unregister(g_footer_id);g_footer_id = 0; }
    if (g_list) { meow_widget_free(g_list); g_list = NULL; }
    if (g_tabs) { meow_widget_free(g_tabs); g_tabs = NULL; }
    if (g_tb)   { meow_widget_free(g_tb);   g_tb = NULL; }
}

meow_view *home_view_create(void)
{
    static const meow_view_hooks h = {
        .on_create  = home_page_create,
        .on_enter   = home_page_enter,
        .on_leave   = home_page_leave,
        .on_destroy = home_page_destroy,
    };
    return meow_view_create(ACT_HOME, MEOW_VIEW_ACTIVITY, &h, &g_hc);
}