/* ui/search.c — 搜索页（ACT_SEARCH，顶栏搜索按钮进入）。
 *
 * 独立页面：搜索输入框（SDK TextField，接 IME §5.1，仅英文/数字）+ 红色「搜索」按钮 +
 * 结果列表（点击可播，复用 g_st.songs[] 起点：播放/上下一首均对结果集生效）。
 * 搜索结果网络走后台 worker（search_worker），UI 不卡。
 *
 * 风控纪律（用户指定）：**搜索请求只在用户确认时发**——用户点「搜索」按钮才发起 cloudsearch，
 * 进入页面不自动搜索；IME 输入仅本地编辑，不逐键发请求。
 */
#include "../ncm_app_internal.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <pthread.h>

typedef struct { meow_view *view; int active; } search_ctrl;
static search_ctrl g_sc;

static meow_widget *g_tb, *g_field, *g_list;
static ncm_rect_t   r_cont, r_list, r_btn;
static int          g_empty_id, g_footer_id, g_btn_id;
static int          g_press_row, g_press_delta, g_dragging, g_drag_last_y;

static pthread_mutex_t g_mu = PTHREAD_MUTEX_INITIALIZER;
static pthread_t       g_thr;
static int             g_thr_on;
static volatile int    g_gen;
static int             g_acked;
static volatile int    g_loading;
static char            g_query[256];

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

static int sr_src2(int idx, meow_list_item *out, void *ctx)
{
    (void)ctx;
    if (idx < 0 || idx >= g_st.search_count) return 0;
    ncm_song_t *s = &g_st.songs[idx];
    static char sub[256];
    if (s->art_name[0] && s->album_name[0]) snprintf(sub, sizeof sub, "%s · %s", s->art_name, s->album_name);
    else if (s->art_name[0])                snprintf(sub, sizeof sub, "%s", s->art_name);
    else                                    snprintf(sub, sizeof sub, "%s", s->album_name);
    out->icon_kind = MEOW_LIST_ICON_NONE;
    out->title = s->name;
    out->subtitle = sub;
    out->right  = MEOW_LIST_RIGHT_ARROW;
    out->on = 0; out->enabled = 1;
    return 1;
}

static void sr_draw_empty(void *ctx)
{
    (void)ctx;
    if (meow_ui_activity_active() != ACT_SEARCH) return;
    if (g_st.search_count != 0 && g_st.search_err == 0) return;
    if (g_loading) { ncm_draw_empty(r_list, "SEARCHING", "正在搜索..."); return; }
    if (g_st.search_err == NCM_ERR_AUTH) ncm_draw_empty(r_list, "SESSION EXPIRED", "请重新登录");
    else if (g_st.search_err)            ncm_draw_empty(r_list, "SEARCH FAILED", "点「搜索」重试");
    else if (!g_query[0])                ncm_draw_empty(r_list, "NO KEYWORD", "输入关键词点「搜索」");
    else                                 ncm_draw_empty(r_list, "NO RESULTS", "未找到相关歌曲");
}

static void sr_draw_footer(void *ctx)
{
    (void)ctx;
    if (meow_ui_activity_active() != ACT_SEARCH) return;
    if (g_st.search_err != 0 || g_st.search_count == 0) return;
    char foot[64];
    snprintf(foot, sizeof foot, "找到 %d 个结果", g_st.search_count);
    ncm_draw_footer(r_cont, foot);
}

/* 「搜索」红色确认钮（SDK meow_btn FILLED 是 MD3 蓝；App 自绘品牌红）。 */
static void sr_draw_btn(void *ctx)
{
    (void)ctx;
    if (meow_ui_activity_active() != ACT_SEARCH) return;
    const ncm_pal_t *pa = ncm_palette(g_dark);
    ncm_draw_button(r_btn.x, r_btn.y, r_btn.w, r_btn.h, "搜索", pa->red, pa->on_red);
}

static void sr_apply(void)
{
    if (g_list) {
        meow_listview_set_count(g_list, g_st.search_count);
        meow_listview_set_scroll(g_list, 0);
        meow_listview_set_sel(g_list, -1);
    }
    const meow_theme *th = meow_theme_get();
    meow_ui_set_page_bg(th->bg);
    meow_ui_paint_full();
}

/* 后台 worker：唯一网络调用（cloudsearch），UI 不卡。 */
static void *search_worker(void *arg)
{
    (void)arg;
    const char *kw = g_query;
    int n = 0;
    int rc = ncm_api_cloudsearch(g_st.ctx.device_id, g_st.ctx.cookie, kw,
                                 g_st.songs, NCM_SEARCH_MAX, &n);
    pthread_mutex_lock(&g_mu);
    if (rc == NCM_OK) {
        g_st.search_count = n;
        g_st.song_count = n;         /* 结果集作为当前播放上下文 */
        g_st.search_err = 0;
    } else {
        g_st.search_count = 0;
        g_st.song_count = 0;
        g_st.search_err = rc;
    }
    g_loading = 0;
    g_gen++;
    pthread_mutex_unlock(&g_mu);
    return NULL;
}

void search_submit(const char *kw)
{
    if (!kw || !kw[0]) { ncm_snack("请输入关键词"); return; }
    ncm_strlcpy(g_query, kw, sizeof g_query);
    ncm_strlcpy(g_st.search_query, kw, sizeof g_st.search_query);
    if (g_host_mock) {                       /* 宿主/测试：预置结果，同步 */
        g_loading = 0; g_st.search_err = 0; sr_apply(); return;
    }
    if (g_thr_on) return;                    /* 已有 worker 在跑 */
    g_st.search_err = 0;
    g_st.search_count = 0;
    g_loading = 1;
    g_thr_on = 1;
    if (pthread_create(&g_thr, NULL, search_worker, NULL) != 0) {
        g_thr_on = 0; g_loading = 0; g_st.search_err = NCM_ERR_IO;
    }
    sr_apply();
}

void search_tick(uint64_t now)
{
    (void)now;
    chrome_tick();
    if (!g_thr_on) return;
    if (g_gen == g_acked) return;
    g_acked = g_gen;
    g_thr_on = 0;
    g_loading = 0;
    sr_apply();
}

void search_open(void)
{
    meow_view_page_push(ACT_SEARCH);
}

int search_is_active(void) { return g_sc.active; }

int search_on_tap(int x, int y)
{
    if (g_tb) {
        int ah = meow_topappbar_hit(g_tb, x, y);
        if (ah == MEOW_TOPBAR_BACK) { sr_drag_reset(); meow_view_page_pop(); return 1; }
        if (ah >= 0) { sr_drag_reset(); return 1; }
    }
    if (x >= r_btn.x && x < r_btn.x + r_btn.w && y >= r_btn.y && y < r_btn.y + r_btn.h) {
        const char *t = meow_textfield_text(g_field);   /* 「搜索」确认（风控：仅此处发） */
        search_submit(t ? t : "");
        return 1;
    }
    if (g_field && meow_widget_hit(g_field, x, y)) {  /* 唤 IME */
        meow_textfield_activate(g_field);
        return 1;
    }
    if (g_st.search_count > 0 && g_st.search_err == 0 && meow_widget_hit(g_list, x, y)) {
        int row = meow_listview_hit(g_list, x, y);
        if (row < 0) { sr_drag_reset(); return 1; }
        sr_drag_reset();
        player_play_song(row);   /* 结果集即 g_st.songs[]，点击可播 */
        return 1;
    }
    return 0;
}

void search_touch_down(int x, int y)
{
    sr_drag_reset();
    if (g_st.search_count == 0 || g_st.search_err != 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 search_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 search_swipe(int dir, int dist)
{
    if (dir != MEOW_SWIPE_UP && dir != MEOW_SWIPE_DOWN) return;
    if (g_st.search_count == 0 || g_st.search_err != 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);
}

static void sr_page_create(meow_view *v, void *ctx)
{
    (void)v;
    ((search_ctrl *)ctx)->view = v;
    r_cont = ncm_content_rect();
    ncm_rect_t field = NR(16, r_cont.y + 12, r_cont.w - 32, 48);
    r_btn = NR(field.x, field.y + field.h + 12, field.w, 44);
    r_list = NR(16, r_btn.y + r_btn.h + 12, r_cont.w - 32,
                r_cont.y + r_cont.h - APP_FOOTER_H - (r_btn.y + r_btn.h + 12));
    if (r_list.h < 0) r_list.h = 0;
    meow_ui_activity_push(ACT_SEARCH);   /* owner=ACT_SEARCH */
    g_tb = ncm_topbar_create("搜索", 1, NULL);
    if (!g_st.search_query[0]) ncm_strlcpy(g_st.search_query, "", sizeof g_st.search_query);
    g_field = meow_textfield_create(field.x, field.y, field.w, field.h,
                                    "输入歌曲 / 歌手", g_st.search_query,
                                    sizeof g_st.search_query, MEOW_IME_ASCII);
    g_list = meow_listview_create(r_list.x, r_list.y, r_list.w, r_list.h, 0,
                                  sr_src2, NULL, MEOW_LIST_SEL_NONE);
    meow_listview_set_item_h(g_list, APP_ROW_H);
    meow_ui_activity_pop();
    meow_widget_set_z(g_list, 10);
    g_btn_id   = meow_draw_custom_register(60, r_btn.x, r_btn.y, r_btn.w, r_btn.h,
                                           sr_draw_btn, NULL);
    g_empty_id = meow_draw_custom_register(1, r_list.x, r_list.y, r_list.w, r_list.h,
                                           sr_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, sr_draw_footer, NULL);
    sr_drag_reset();
}

static void sr_page_enter(meow_view *v, void *ctx)
{
    (void)v;
    ((search_ctrl *)ctx)->active = 1;
    const meow_theme *th = meow_theme_get();
    meow_ui_set_page_bg(th->bg);
    meow_ui_paint_full();
}

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

static void sr_page_destroy(meow_view *v, void *ctx)
{
    (void)v; (void)ctx;
    if (g_btn_id)  { meow_draw_unregister(g_btn_id);   g_btn_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_field){ meow_widget_free(g_field); g_field = NULL; }
    if (g_tb)   { meow_widget_free(g_tb);   g_tb = NULL; }
}

meow_view *search_view_create(void)
{
    static const meow_view_hooks h = {
        .on_create  = sr_page_create,
        .on_enter   = sr_page_enter,
        .on_leave   = sr_page_leave,
        .on_destroy = sr_page_destroy,
    };
    return meow_view_create(ACT_SEARCH, MEOW_VIEW_ACTIVITY, &h, &g_sc);
}