#include "attachment_sender.h"
#include "instance_lite.h"
#include "../../../lib/debug_config.h"
#include "../../../lib/mem.h"
#include "../../../lib/u_async.h"
#include "../../../src/chat/chat_core.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/stat.h>
#include <unistd.h>
#include <libgen.h>

int attachment_send(const char* channel_id, const char* src_file_path, const char* db_path) {
    if (!channel_id || !src_file_path || !db_path) {
        DEBUG_ERROR(DEBUG_CATEGORY_GENERAL, "attachment_send: invalid args");
        return -1;
    }

    struct UASYNC* ua = instance_lite_get_uasync();
    if (!ua) { DEBUG_ERROR(DEBUG_CATEGORY_GENERAL, "attachment_send: no uasync"); return -1; }

    /* get original basename for display, then make unique filename for storage */
    char path_copy[1024];
    snprintf(path_copy, sizeof(path_copy), "%s", src_file_path);
    char* fname = basename(path_copy);
    char original_basename[256];
    snprintf(original_basename, sizeof(original_basename), "%s", fname);
    char* dot = strrchr(fname, '.');
    char ext[32] = "";
    if (dot) { snprintf(ext, sizeof(ext), "%s", dot + 1); *dot = '\0'; }

    struct stat st; memset(&st, 0, sizeof(st));
    stat(src_file_path, &st);

    /* generate dt/suffix for unique filename */
    time_t t = time(NULL);
    struct tm tm_buf; localtime_r(&t, &tm_buf);
    char dt[32]; snprintf(dt, sizeof(dt), "%04d%02d%02d-%02d%02d%02d",
        tm_buf.tm_year + 1900, tm_buf.tm_mon + 1, tm_buf.tm_mday,
        tm_buf.tm_hour, tm_buf.tm_min, tm_buf.tm_sec);
    int rnd = rand() & 0xFFFF;
    char suffix[8]; snprintf(suffix, sizeof(suffix), "%04x", rnd);

    /* ensure media dir exists */
    char media_dir[1024];
    snprintf(media_dir, sizeof(media_dir), "%s/media/%s", db_path, channel_id);
    {
        char tmp[1024]; size_t off = 0;
        for (size_t i = 0; media_dir[i] && off < sizeof(tmp) - 1; i++) {
            tmp[off++] = media_dir[i];
            if (media_dir[i] == '/' && off > 1) { tmp[off] = '\0'; mkdir(tmp, 0755); }
        }
        mkdir(tmp, 0755);
    }

    /* single file path — no splitting */
    char media_file[1280];
    snprintf(media_file, sizeof(media_file), "%s/%s_%s_%s.%s",
             media_dir, dt, fname, suffix, ext[0] ? ext : "bin");

    /* post chat_msg_submit — media_copy=1 so media_index copies src to dest
       data = original_basename — becomes first part of message "d" field: "name.ext|size|..." */
    size_t datalen = strlen(original_basename);
    struct chat_msg_submit* req = u_calloc(1, sizeof(struct chat_msg_submit) + datalen + 1);
    if (!req) return -1;

    req->inst = instance_lite_get_instance();
    snprintf(req->channel_id, sizeof(req->channel_id), "%s", channel_id);
    snprintf(req->content_type, sizeof(req->content_type), "application/octet-stream");
    snprintf(req->media_src, sizeof(req->media_src), "%s", src_file_path);
    snprintf(req->media_dest, sizeof(req->media_dest), "%s", media_file);
    req->media_copy = 1;
    req->data = (uint8_t*)(req + 1);
    memcpy(req->data, original_basename, datalen);
    req->data_len = (uint32_t)datalen;
    req->timestamp = 0;

    DEBUG_INFO(DEBUG_CATEGORY_GENERAL, "attachment_send: ch=%s src=%s dst=%s name=%s size=%lld",
               channel_id, src_file_path, media_file, original_basename, (long long)st.st_size);

    uasync_post(ua, chat_core_submit_trampoline, req);
    return 0;
}