/* ui/search.c — 搜索页（ACT_SEARCH，顶栏搜索按钮进入）。
 *
 * §23（REPORT）：
 *   1. 搜索历史：进页自动弹键盘（meow_textfield_activate）；历史本地持久化（meow_config，
 *      最近 ≤12 条、去重、最新在前）；未输入时显示历史列表（点=直接搜、左滑删单条、清空全部）。
 *   2. 结果分类「单曲/歌单」：顶部小页签（单曲 type=1 / 歌单 type=1000）；两页签各自独立
 *      结果集与滚动位置（g_scroll_song/g_scroll_pl）；歌单行点击=playlist_open_pl 进详情。
 *   3. 加载更多：触底分页（offset 累加，NCM_SEARCH_PAGE=30/页，cloudsearch 同参数）；
 *      每类各记各的 offset（appstate_search_offset 回填）。
 *   4. 修 search_on_tap 误触（NCM_UI_REVIEW §3-2）：套用 g_press_row + g_press_delta>10 抑制
 *      （对齐 home/playlist §13.3）。
 *   5. 结果不再覆写歌单上下文：单曲结果写 g_st.search_songs[]（独立数组，appstate 持有），
 *      播放搜索单曲走 player_play_search_song（建立「搜索队列」上下文，queue_src=SEARCH），
 *      原歌单窗口（g_st.songs[]/track_ids_count）不被破坏。
 *
 * 风控纪律（用户指定）：**真实请求只在用户点「搜索」按钮/切页签/翻页时发**——进页不自动搜索，
 * IME 输入仅本地编辑，不逐键发请求。调试/测试全部离线 stub（g_host_mock）。
 */
#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;

/* 视图模式 */
enum { SR_HIST = 0, SR_RES, SR_EMPTY };

static meow_widget *g_tb, *g_field, *g_list;
static ncm_rect_t   r_cont, r_list, r_btn, r_tabs[2];
static int          g_empty_id, g_footer_id, g_btn_id, g_tabbar_id;
static int          g_press_row, g_press_delta, g_dragging, g_drag_last_y;
static int          g_scroll_song, g_scroll_pl;   /* 两页签各自滚动位置（§23）*/

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];              /* worker 所搜关键词（不可含引用问题，见 core 转义） */
static int             g_tab;                     /* 0=单曲 1=歌单 */
static int             g_searched;                /* 1=已提交过搜索（区分「输入后未搜」空态文案）*/
static int             g_req_tab, g_req_offset, g_req_replace;
static volatile int    g_more_err;                /* 翻页失败（snack 一次）*/

static void *search_worker(void *arg);   /* 前向声明（sr_maybe_load_more 先引用） */

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

/* 当前视图（§23 历史/结果/空态）。由 g_st.search_query 是否为空 + 各页签结果数推导。 */
static int sr_view(void)
{
    if (g_st.search_query[0] == 0)
        return (appstate_search_history_count() > 0) ? SR_HIST : SR_EMPTY;
    if (appstate_search_count(g_tab) > 0) return SR_RES;
    return SR_EMPTY;
}

static int sr_count(void)
{
    int v = sr_view();
    if (v == SR_HIST) return appstate_search_history_count();
    if (v == SR_RES)  return appstate_search_count(g_tab);
    return 0;
}

static void sr_save_scroll(void)
{
    if (g_tab == 0) g_scroll_song = meow_listview_scroll(g_list);
    else            g_scroll_pl   = meow_listview_scroll(g_list);
}

static void sr_restore_scroll(void)
{
    meow_listview_set_scroll(g_list, (g_tab == 0) ? g_scroll_song : g_scroll_pl);
}

static int sr_src2(int idx, meow_list_item *out, void *ctx)
{
    (void)ctx;
    int v = sr_view();
    if (v == SR_HIST) {
        char q[NCM_SEARCH_HIST_LEN];
        if (!appstate_search_history_get(idx, q, sizeof q)) return 0;
        out->icon_kind = MEOW_LIST_ICON_NONE;
        out->title = q;
        out->subtitle = "";
        out->right  = MEOW_LIST_RIGHT_NONE;
        out->on = 0; out->enabled = 1;
        return 1;
    }
    if (v == SR_RES) {
        if (g_tab == 0) {
            static ncm_song_t s;
            if (appstate_search_song(idx, &s) != 0) return 0;
            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;
        } else {
            static ncm_playlist_t p;
            if (appstate_search_pl(idx, &p) != 0) return 0;
            static char sub[64];
            snprintf(sub, sizeof sub, "%d 首", p.track_count);
            out->icon_kind = MEOW_LIST_ICON_NONE;
            out->title = p.name;
            out->subtitle = sub;
        }
        out->right  = MEOW_LIST_RIGHT_ARROW;
        out->on = 0; out->enabled = 1;
        return 1;
    }
    return 0;   /* SR_EMPTY：无行 */
}

static void sr_draw_empty(void *ctx)
{
    (void)ctx;
    if (meow_ui_activity_active() != ACT_SEARCH) return;
    if (sr_view() != SR_EMPTY) return;                   /* 历史/结果态有行，空态不画 */
    if (g_loading) { ncm_draw_empty(r_list, "搜索中", "正在搜索..."); return; }
    if (g_st.search_err == NCM_ERR_AUTH) ncm_draw_empty(r_list, "登录已过期", "请重新登录");
    else if (g_st.search_err)            ncm_draw_empty(r_list, "搜索失败", "点「搜索」重试");
    else if (!g_st.search_query[0])      ncm_draw_empty(r_list, "输入关键词", "输入后点「搜索」");
    else if (!g_searched)                ncm_draw_empty(r_list, "输入后点「搜索」", "或点历史记录");
    else                                 ncm_draw_empty(r_list, "没有结果",
                                                         g_tab == 0 ? "未找到相关歌曲" : "未找到相关歌单");
}

static void sr_draw_footer(void *ctx)
{
    (void)ctx;
    if (meow_ui_activity_active() != ACT_SEARCH) return;
    int v = sr_view();
    if (v == SR_HIST) {                                 /* 历史：右缘「清空全部」按钮 */
        const meow_theme *th = meow_theme_get();
        const ncm_pal_t  *pa = ncm_palette(g_dark);
        int cw = meow_ui_text_width("清空全部", th->font_body);
        int fx = r_cont.x + r_cont.w - 16 - cw;
        int fy = r_cont.y + r_cont.h - APP_FOOTER_H + (APP_FOOTER_H - th->font_body) / 2;
        meow_ui_text(fx, fy, "清空全部", th->font_body, pa->red);
        return;
    }
    if (v == SR_RES) {
        int n = appstate_search_count(g_tab);
        if (n > 0) {
            char foot[96];
            snprintf(foot, sizeof foot, "%s %d %s%s",
                     g_tab == 0 ? "单曲" : "歌单", n,
                     g_tab == 0 ? "个结果" : "个歌单",
                     appstate_search_has_more(g_tab) ? " / 加载更多" : "");
            ncm_draw_footer(r_cont, foot);
        }
    }
}

static void sr_draw_tabs(void *ctx)
{
    (void)ctx;
    if (meow_ui_activity_active() != ACT_SEARCH) return;
    if (sr_view() != SR_RES) return;                     /* 页签只在结果态显示 */
    const meow_theme *th = meow_theme_get();
    const ncm_pal_t  *pa = ncm_palette(g_dark);
    static const char *lab[2] = { "单曲", "歌单" };
    for (int i = 0; i < 2; i++) {
        int on = (g_tab == i);
        uint32_t col = on ? pa->red : th->onSurfaceVariant;
        meow_ui_text_center(r_tabs[i].x + r_tabs[i].w / 2, r_tabs[i].y + (r_tabs[i].h - th->font_body) / 2,
                            lab[i], th->font_body, col);
        if (on) meow_ui_fill_rect(r_tabs[i].x, r_tabs[i].y + r_tabs[i].h - 3, r_tabs[i].w, 3, pa->red);
    }
}

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, sr_count());
    const meow_theme *th = meow_theme_get();
    meow_ui_set_page_bg(th->bg);
    meow_ui_paint_full();
}

/* 触底翻页（§23）：RES 态 + 还有下一页 + 未在载 → 按当前页签的 offset 拉下一页。
 * 仅由用户滚动动作触发（风控：翻页=用户动作）。 */
static void sr_maybe_load_more(void)
{
    if (sr_view() != SR_RES) return;
    if (g_thr_on || g_loading || g_st.search_err != 0) return;
    int n = appstate_search_count(g_tab);
    int cap = (g_tab == 0) ? NCM_SEARCH_SONG_MAX : NCM_SEARCH_PL_MAX;
    if (n <= 0 || n >= cap || !appstate_search_has_more(g_tab)) return;
    int item = APP_ROW_H;
    int scroll = meow_listview_scroll(g_list);
    if (scroll + r_list.h < n * item - item * 2) return;   /* 未近底 */
    g_req_tab = g_tab; g_req_offset = n; g_req_replace = 0;
    /* 单飞：无 worker 才发（search_worker 尾部解锁） */
    g_thr_on = 1; g_loading = 1; g_more_err = 0;
    if (ncm_thread_create(&g_thr, search_worker, NULL) != 0) {
        g_thr_on = 0; g_loading = 0; g_more_err = 1;
    }
}

static void *search_worker(void *arg)
{
    (void)arg;
    int tab = g_req_tab, off = g_req_offset, repl = g_req_replace;
    const char *kw = g_query;
    int rc = NCM_ERR_IO, n = 0;
    int64_t total = -1;
    if (tab == 0) {
        static ncm_song_t sbuf[NCM_SEARCH_PAGE];
        rc = ncm_api_cloudsearch_song(g_st.ctx.device_id, g_st.ctx.cookie, kw,
                                      off, NCM_SEARCH_PAGE, sbuf, NCM_SEARCH_PAGE, &n, &total);
        pthread_mutex_lock(&g_mu);
        if (rc == NCM_OK) {
            if (repl) appstate_search_clear(0);
            appstate_search_append_songs(n, sbuf, total);
            g_st.search_err = 0; g_more_err = 0;
        } else if (repl) g_st.search_err = rc;
        else             g_more_err = 1;
    } else {
        static ncm_playlist_t pbuf[NCM_SEARCH_PAGE];
        rc = ncm_api_cloudsearch_playlist(g_st.ctx.device_id, g_st.ctx.cookie, kw,
                                          off, NCM_SEARCH_PAGE, pbuf, NCM_SEARCH_PAGE, &n, &total);
        pthread_mutex_lock(&g_mu);
        if (rc == NCM_OK) {
            if (repl) appstate_search_clear(1);
            appstate_search_append_pls(n, pbuf, total);
            g_st.search_err = 0; g_more_err = 0;
        } else if (repl) g_st.search_err = rc;
        else             g_more_err = 1;
    }
    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);
    appstate_search_history_add(kw);                 /* §23：历史（去重+最新在前+≤12）*/
    g_searched = 1;
    g_scroll_song = g_scroll_pl = 0;
    if (g_list) { meow_listview_set_scroll(g_list, 0); }
    appstate_search_clear(g_tab ^ 1);                /* 新查询：清非当前页签，切过去时懒加载新词 */
    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;                            /* 单飞：已有 worker 在跑 */
    g_req_tab = g_tab; g_req_offset = 0; g_req_replace = 1;
    g_st.search_err = 0;
    g_loading = 1; g_more_err = 0;
    g_thr_on = 1;
    if (ncm_thread_create(&g_thr, search_worker, NULL) != 0) {
        g_thr_on = 0; g_loading = 0; g_st.search_err = NCM_ERR_IO;
    }
    sr_apply();
}

/* 切页签：保存旧滚动 → 换页签 → 恢复该页签滚动；空结果页签懒加载（用户切页签动作）。 */
static void sr_set_tab(int t)
{
    if (t == g_tab) return;
    sr_save_scroll();
    g_tab = t;
    g_st.search_tab = t;                                /* 应用态同步（重启/重进保持） */
    sr_restore_scroll();
    sr_apply();
    if (g_st.search_query[0] && !g_thr_on && !g_loading &&
        g_st.search_err == 0 && appstate_search_count(g_tab) == 0) {
        g_req_tab = g_tab; g_req_offset = 0; g_req_replace = 1;
        g_loading = 1; g_more_err = 0;
        g_thr_on = 1;
        if (ncm_thread_create(&g_thr, search_worker, NULL) != 0) {
            g_thr_on = 0; g_loading = 0;
        }
    }
}

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;
    if (g_more_err) { ncm_snack("加载失败"); g_more_err = 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;
    }
    int v = sr_view();
    if (v == SR_RES) {                                  /* 页签切换 */
        for (int i = 0; i < 2; i++)
            if (x >= r_tabs[i].x && x < r_tabs[i].x + r_tabs[i].w &&
                y >= r_tabs[i].y && y < r_tabs[i].y + r_tabs[i].h) { sr_set_tab(i); return 1; }
    }
    if (v == SR_HIST &&                                  /* 历史「清空全部」按钮 */
        y >= r_cont.y + r_cont.h - APP_FOOTER_H && y < r_cont.y + r_cont.h &&
        x >= r_cont.x + r_cont.w - 16 - 70) {
        sr_drag_reset();
        appstate_search_history_clear();
        sr_apply();
        return 1;
    }
    if (g_field && meow_widget_hit(g_field, x, y)) {     /* 唤 IME */
        meow_textfield_activate(g_field);
        return 1;
    }
    if (meow_widget_hit(g_list, x, y)) {
        if (v == SR_EMPTY) {                             /* 失败态：点内容区重试（风控：用户动作） */
            if (g_st.search_err && g_st.search_query[0]) {
                sr_drag_reset(); g_st.search_err = 0;
                if (!g_thr_on) {
                    g_req_tab = g_tab; g_req_offset = 0; g_req_replace = 1;
                    g_loading = 1;
                    g_thr_on = 1;
                    if (ncm_thread_create(&g_thr, search_worker, NULL) != 0) {
                        g_thr_on = 0; g_loading = 0; g_st.search_err = NCM_ERR_IO;
                    }
                }
                return 1;
            }
            sr_drag_reset();
            return 1;
        }
        /* 误触修复（§13.3/§23）：按下行 + 拖动>10 抑制（对齐 home/playlist） */
        int was_drag = (g_press_delta > 10);
        int row = (g_press_row >= 0) ? g_press_row : meow_listview_hit(g_list, x, y);
        sr_drag_reset();
        if (row < 0 || was_drag) return 1;
        if (v == SR_HIST) {
            char q[NCM_SEARCH_HIST_LEN];
            if (appstate_search_history_get(row, q, sizeof q)) search_submit(q);
            return 1;
        }
        if (g_tab == 0) player_play_search_song(row);    /* 单曲：搜索队列起播（§23）*/
        else {
            ncm_playlist_t p;
            if (appstate_search_pl(row, &p) == 0) playlist_open_pl(&p);   /* 歌单：进详情 */
        }
        return 1;
    }
    return 0;
}

int search_swipe_left(void)
{
    if (sr_view() != SR_HIST) return 0;                  /* 仅历史模式左滑删单条 */
    int row = g_press_row;                               /* touch_down 已记按下行 */
    sr_drag_reset();
    if (row >= 0) {
        appstate_search_history_remove(row);
        sr_apply();
        return 1;                                       /* 已消费：不触返回 */
    }
    return 0;
}

void search_touch_down(int x, int y)
{
    sr_drag_reset();
    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);
        sr_maybe_load_more();
    }
}

void search_swipe(int dir, int dist)
{
    if (dir != MEOW_SWIPE_UP && dir != MEOW_SWIPE_DOWN) return;
    if (sr_view() != SR_RES) 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);
        sr_maybe_load_more();
    }
}

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);
    int by = r_btn.y + r_btn.h + 8;
    r_tabs[0] = NR(r_btn.x, by, r_btn.w / 2 - 6, 36);
    r_tabs[1] = NR(r_btn.x + r_btn.w / 2 + 6, by, r_btn.w / 2 - 6, 36);
    r_list = NR(16, by + 36 + 8, r_cont.w - 32,
                r_cont.y + r_cont.h - APP_FOOTER_H - (by + 36 + 8));
    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);
    /* 中文搜索：IME 切 MEOW_IME_PINYIN（拼音候选上屏 UTF-8 到 g_st.search_query，经 on_change 实时回写；
     * 键盘「拼/英」键可切回 ASCII 输英文，「中」热区回拼音——英文零回归）。 */
    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_PINYIN);
    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_tabbar_id = meow_draw_custom_register(40, r_tabs[0].x, r_tabs[0].y,
                                            r_btn.w, r_tabs[0].h, sr_draw_tabs, 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);
    /* 页签初始 = 应用态记录值（宿主 dump 可指定 search_tab）；越界回落 0。 */
    g_tab = (g_st.search_tab == 0 || g_st.search_tab == 1) ? g_st.search_tab : 0;
    sr_drag_reset();
}

static void sr_page_enter(meow_view *v, void *ctx)
{
    (void)v;
    ((search_ctrl *)ctx)->active = 1;
    sr_apply();          /* 进页即按当前模式设列表 count（历史/结果/空态），避免首屏空列表 */
#ifndef MEOW_UI_HOST_TEST
    /* §23：进页自动弹键盘（字段为空时；返回浏览结果不打断）。宿主离屏为阻塞式模态 IME，跳过。 */
    if (g_field && g_st.search_query[0] == 0) meow_textfield_activate(g_field);
#else
    (void)0;
#endif
}

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_tabbar_id){ meow_draw_unregister(g_tabbar_id);g_tabbar_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);
}