/* logic/appstate.c — 应用全局状态：ctx/登录/歌单/歌曲/设置。仅依赖核心库 + SDK meow_config_*。 */
#include "../ncm_app_internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define NCM_DEFAULT_DATA "/usr/data/mnt/sd_0/MeowData/dev.player.ncm/data"

int appstate_init(void)
{
    const char *dd = getenv("MEOW_DATA_DIR");
    if (!dd || !dd[0]) dd = NCM_DEFAULT_DATA;
    strncpy(g_st.data_dir, dd, sizeof g_st.data_dir - 1);
    g_st.data_dir[sizeof g_st.data_dir - 1] = 0;

    ncm_ctx_init(&g_st.ctx, g_st.data_dir);          /* device_id + cookie 载入 + cache */
    if (g_st.ctx.cache.dir[0])
        strncpy(g_st.cache_dir, g_st.ctx.cache.dir, sizeof g_st.cache_dir - 1);
    else
        ncm_ctx_default_cache_dir(g_st.data_dir, g_st.cache_dir, sizeof g_st.cache_dir);

    appstate_load_settings();
    g_st.logged_in  = (g_st.ctx.cookie[0] != 0);
    g_st.active_playlist = -1;
    g_st.playing_song = -1;
    g_st.qr_size = 0;
    g_st.login_state = NCM_LOGIN_PENDING;

    /* uid/nickname 从配置恢复（登录时落盘）；uid 缺失时不在此阻塞校验——由 home_reload 拉歌单时
     * appstate_ensure_uid 触发 login_status_check（启动快，避免首屏长时间网络阻塞）。 */
    meow_config_get("ncm.uid", g_st.uid, sizeof g_st.uid);
    meow_config_get("ncm.nickname", g_st.nickname, sizeof g_st.nickname);

    return 0;
}

void appstate_load_settings(void)
{
    g_st.cache_limit_gb = meow_config_int("ncm.cache_limit_gb", 10);
    if (g_st.cache_limit_gb < 1)  g_st.cache_limit_gb = 1;
    if (g_st.cache_limit_gb > 100) g_st.cache_limit_gb = 100;

    g_st.level = meow_config_int("ncm.level", NCM_LEVEL_HIRES);
    if (g_st.level < NCM_LEVEL_STANDARD || g_st.level > NCM_LEVEL_HIRES)
        g_st.level = NCM_LEVEL_HIRES;

    ncm_cache_set_limit_gb(&g_st.ctx.cache, g_st.cache_limit_gb);
    g_st.ctx.default_level = g_st.level;
}

void appstate_save_settings(void)
{
    char b[16];
    snprintf(b, sizeof b, "%d", g_st.cache_limit_gb);
    meow_config_set("ncm.cache_limit_gb", b);
    snprintf(b, sizeof b, "%d", g_st.level);
    meow_config_set("ncm.level", b);
    ncm_cache_set_limit_gb(&g_st.ctx.cache, g_st.cache_limit_gb);
    g_st.ctx.default_level = g_st.level;
}

void appstate_set_logged_in(const char *uid, const char *nickname)
{
    if (uid && uid[0]) { ncm_strlcpy(g_st.uid, uid, sizeof g_st.uid); meow_config_set("ncm.uid", uid); }
    if (nickname && nickname[0]) {
        ncm_strlcpy(g_st.nickname, nickname, sizeof g_st.nickname);
        meow_config_set("ncm.nickname", nickname);
    }
    g_st.logged_in = 1;
}

void appstate_logout(void)
{
    ncm_ctx_clear_cookie(&g_st.ctx);
    g_st.logged_in = 0;
    g_st.uid[0] = 0;
    g_st.nickname[0] = 0;
    g_st.active_playlist = -1;
    g_st.playing_song = -1;
    g_st.song_count = 0;
    meow_config_remove("ncm.uid");
    meow_config_remove("ncm.nickname");
    cover_cache_reset();
}

/* 若 uid 缺失（cookie 在但没存 uid），用 login_status_check 校验并取回。返回 0=成功。 */
int appstate_ensure_uid(void)
{
    if (!g_st.logged_in || !g_st.ctx.cookie[0]) return NCM_ERR_AUTH;
    if (g_st.uid[0]) return NCM_OK;
    char uid[32], nick[128];
    int rc = ncm_login_status_check(g_st.ctx.device_id, g_st.ctx.cookie, uid, sizeof uid,
                                    nick, sizeof nick);
    if (rc == NCM_OK) {
        appstate_set_logged_in(uid, nick);
        return NCM_OK;
    }
    /* 会话失效：清 cookie → 未登录 */
    if (rc == NCM_ERR_AUTH) {
        ncm_ctx_clear_cookie(&g_st.ctx);
        g_st.logged_in = 0;
    }
    return rc;
}

int appstate_load_playlists(void)
{
    if (!g_st.logged_in) return NCM_ERR_AUTH;
    int rc = appstate_ensure_uid();
    if (rc != NCM_OK) return rc;
    memset(g_st.playlists, 0, sizeof g_st.playlists);
    int n = 0;
    rc = ncm_api_user_playlist(g_st.ctx.device_id, g_st.ctx.cookie, g_st.uid,
                               NCM_PLAYLIST_MAX, 0, g_st.playlists, NCM_PLAYLIST_MAX, &n);
    g_st.playlist_count = (rc == NCM_OK) ? n : 0;
    meow_log(MEOW_LOG_INFO, "home: playlists rc=%d count=%d uid=%s", rc, g_st.playlist_count, g_st.uid);
    return rc;
}

int appstate_load_playlist_songs_page(int idx, int offset, int limit)
{
    if (idx < 0 || idx >= g_st.playlist_count) return NCM_ERR_ARG;
    /* 不在此处写 g_st.active_playlist：调用方（playlist_open/UI）已在 UI 线程设定；
     * 若后台 worker 在此改写，会覆盖用户已切换到的新歌单，造成“打开 B 却显示 A”。 */
    const ncm_playlist_t *pl = &g_st.playlists[idx];
    if (limit <= 0 || limit > NCM_SONG_BATCH) limit = NCM_SONG_BATCH;
    if (offset < 0) offset = 0;

    /* REPORT §13.1：/api/playlist/track/all 服务端分页端点真机全 404（NCM 无此路由），弃用。
     * 回到 §10.11 已验证路径并做**真分页**：detail（n=1）取【全量】trackIds 入 song_ids[]，
     * song_detail 按 ≤NCM_SONG_BATCH 分批拉歌曲对象（含 al.picUrl），offset 为「下一页」起始；
     * 列表触底驱动 offset 前进，song_count 逐页累加（不再一次性拉满，大歌单不冻 UI，
     * 也不把「第 N 页之后的歌」挡在 256 之外——NCM_SONG_MAX 上限提升到 1000，见 §14）。 */

    if (offset == 0) {
        /* 重头：重建 trackIds 索引 + 清空已物化歌曲（song_count 无论成败都归零）。 */
        memset(g_st.song_ids, 0, sizeof g_st.song_ids);
        memset(g_st.songs, 0, sizeof g_st.songs);
        g_st.song_count = 0;
        g_st.track_ids_count = 0;
        int idn = 0;
        int rc = ncm_api_playlist_detail(g_st.ctx.device_id, g_st.ctx.cookie, pl->id,
                                         NULL, 0, NULL, 0,
                                         g_st.song_ids, NCM_SONG_MAX, &idn);
        if (rc != NCM_OK) return rc;
        g_st.track_ids_count = idn;
        /* 首屏只需第 0 页：song_detail 只拉前 limit 首，其余待滚动触底再拉（分页驱动）。 */
    } else if (g_st.track_ids_count == 0) {
        /* 防御：offset>0 但没有索引（不应发生；主路径先走 offset=0）。 */
        return NCM_ERR_ARG;
    }

    if (offset >= g_st.track_ids_count) return NCM_OK;      /* 已到尾部/上限 */
    if (offset >= NCM_SONG_MAX) return NCM_OK;              /* 内存上限：不再物化更多 */

    int can = g_st.track_ids_count - offset;
    int room = NCM_SONG_MAX - offset;
    if (can > limit)  can = limit;                          /* 每页 ≤ limit（保守 100） */
    if (can > room)   can = room;                           /* 不越界 song_ids[]/songs[] */

    int bn = 0;
    int rc = ncm_api_song_detail(g_st.ctx.device_id, g_st.ctx.cookie, &g_st.song_ids[offset],
                                 can, &g_st.songs[offset], NCM_SONG_MAX - offset, &bn);
    if (rc != NCM_OK) return rc;                            /* 失败：song_count 不变（保留已载页） */

    g_st.song_count = offset + bn;                          /* 成功：累加本页 */
    appstate_apply_playlist_cover(idx);
    return NCM_OK;
}

int appstate_load_playlist_songs(int idx)
{
    /* 兼容入口：整批载入（内部按页循环到 NCM_SONG_MAX 或歌单尾部）。 */
    int rc = appstate_load_playlist_songs_page(idx, 0, NCM_SONG_BATCH);
    if (rc != NCM_OK) return rc;
    int off = g_st.song_count;
    while (off < g_st.track_ids_count && off < NCM_SONG_MAX) {
        rc = appstate_load_playlist_songs_page(idx, off, NCM_SONG_BATCH);
        if (rc != NCM_OK) return rc;
        int nxt = g_st.song_count;
        if (nxt <= off) break;                              /* 无进展：防死循环 */
        off = nxt;
    }
    return NCM_OK;
}

void appstate_apply_playlist_cover(int idx)
{
    if (idx < 0 || idx >= g_st.playlist_count) return;
    ncm_strlcpy(g_st.cover_url, g_st.playlists[idx].cover, sizeof g_st.cover_url);
}

/* 设置播放页当前歌曲 + 封面 URL（player 页 UI 读）。idx=-1 表示清除。 */
void appstate_set_playing_song(int idx, const char *cover_url)
{
    g_st.playing_song = idx;
    if (cover_url && cover_url[0])
        ncm_strlcpy(g_st.cover_url, cover_url, sizeof g_st.cover_url);
}

int appstate_current_playing(void)
{
    if (g_st.playing_song < 0 || g_st.playing_song >= g_st.song_count) return -1;
    return g_st.playing_song;
}