#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>

#include "config.h"
#include "rpc.h"
#include "torrent.h"
#include "util.h"
#include "ui/ui.h"

/* Browsers/file managers hand "Open with" targets a file:// URI (percent-
 * encoded) rather than a plain path. Strip and decode that so torrent_add()
 * gets a real filesystem path; magnet:/http(s):// sources pass through
 * untouched since their own percent-encoding must stay intact. */
static void resolve_add_source(const char *in, char *out, size_t outsize)
{
    if (!str_starts_with(in, "file://")) {
        snprintf(out, outsize, "%s", in);
        return;
    }
    const char *p = in + 7;
    size_t o = 0;
    for (size_t i = 0; p[i] && o + 1 < outsize; i++) {
        if (p[i] == '%' && isxdigit((unsigned char)p[i + 1]) && isxdigit((unsigned char)p[i + 2])) {
            char hex[3] = {p[i + 1], p[i + 2], '\0'};
            out[o++] = (char)strtol(hex, NULL, 16);
            i += 2;
        } else {
            out[o++] = p[i];
        }
    }
    out[o] = '\0';
}

/* Adds a torrent handed in via -A/--add (e.g. from a browser's magnet-link
 * handler) before the TUI starts, so the user sees it land in the list
 * instead of a silent background add. msg is filled with the result either
 * way, for display in the TUI's status bar. */
static void add_torrent_startup(RpcClient *rpc, const char *add_source, char *msg, size_t msg_size)
{
    char source[1024];
    resolve_add_source(add_source, source, sizeof(source));

    char err[256];
    if (torrent_add(rpc, source, NULL, err, sizeof(err)) != 0)
        snprintf(msg, msg_size, "Could not add torrent: %s", err);
    else
        snprintf(msg, msg_size, "Torrent added: %s", source);
}

int main(int argc, char **argv)
{
    Config cfg;
    char err[256];
    if (config_load(&cfg, err, sizeof(err)) != 0) {
        fprintf(stderr, "transtui: %s\n", err);
        return 1;
    }

    char add_source[1024];
    config_apply_args(&cfg, argc, argv, add_source, sizeof(add_source));

    RpcClient rpc;
    rpc_init(&rpc, cfg.host, cfg.port, cfg.username[0] ? cfg.username : NULL,
              cfg.password[0] ? cfg.password : NULL);

    char msg[sizeof(add_source) + 32];
    msg[0] = '\0';
    if (add_source[0])
        add_torrent_startup(&rpc, add_source, msg, sizeof(msg));

    /* Only one TUI at a time: if another instance already holds the lock,
     * a --add here has still reached the daemon above and will show up next
     * time that instance polls, so just report the result and exit instead
     * of opening a second ncurses screen. */
    if (single_instance_lock() == 0) {
        if (add_source[0]) {
            printf("%s\n", msg);
            return 0;
        }
        fprintf(stderr, "transtui: already running\n");
        return 1;
    }

    return ui_run(&rpc, &cfg, msg[0] ? msg : NULL);
}