/*
 * cmd_gps.c
 *
 * Copyright (c) 2025 Umber Networks & Robert McMahon
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <time.h>
#include <sys/time.h>
#include "esp_log.h"
#include "esp_console.h"
#include "argtable3/argtable3.h"
#include "gps_sync.h"
#include "app_console.h"

// --- Forward Declarations ---
static int gps_do_status(int argc, char **argv);

// ============================================================================
// COMMAND: gps (Dispatcher)
// ============================================================================

static void print_gps_usage(void) {
    printf("Usage: gps <subcommand> [args]\n");
    printf("Subcommands:\n");
    printf("  status      Show GPS lock status, time, and last NMEA message\n");
    printf("\nType 'gps <subcommand> --help' for details.\n");
}

static int cmd_gps(int argc, char **argv) {
    if (argc < 2 || strcmp(argv[1], "help") == 0 || strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-h") == 0) {
        print_gps_usage();
        return 0;
    }

    if (strcmp(argv[1], "status") == 0) return gps_do_status(argc - 1, &argv[1]);
    if (strcmp(argv[1], "info") == 0)   return gps_do_status(argc - 1, &argv[1]); // Alias

    printf("Unknown subcommand '%s'.\n", argv[1]);
    print_gps_usage();
    return 1;
}

// ----------------------------------------------------------------------------
// Sub-command: status
// ----------------------------------------------------------------------------
static struct {
    struct arg_lit *help;
    struct arg_end *end;
} status_args;

static int gps_do_status(int argc, char **argv) {
    status_args.help = arg_lit0("h", "help", "Help");
    status_args.end  = arg_end(1);

    int nerrors = arg_parse(argc, argv, (void **)&status_args);
    if (nerrors > 0) {
        arg_print_errors(stderr, status_args.end, argv[0]);
        return 1;
    }

    if (status_args.help->count > 0) {
        printf("Usage: gps status\n");
        return 0;
    }

    // 1. Get GPS Data
    gps_timestamp_t ts = gps_get_timestamp();
    int64_t pps_age = gps_get_pps_age_ms();

    char nmea_buf[128] = "<Empty>";
    gps_get_last_nmea(nmea_buf, sizeof(nmea_buf));

    // Strip trailing newline
    size_t len = strlen(nmea_buf);
    if (len > 0 && (nmea_buf[len-1] == '\n' || nmea_buf[len-1] == '\r')) nmea_buf[len-1] = 0;

    // 2. Format Time
    char time_str[64] = "Unknown";
    struct timespec ts_now = {0, 0};

    if (ts.gps_us > 0) {
        // Get raw timespec for display
        clock_gettime(CLOCK_REALTIME, &ts_now);

        time_t now_sec = ts_now.tv_sec;
        struct tm tm_info;
        gmtime_r(&now_sec, &tm_info);
        strftime(time_str, sizeof(time_str), "%Y-%m-%d %H:%M:%S UTC", &tm_info);
    }

    // 3. Print
    printf("GPS Status:\n");
    printf("  Time:           %s\n", time_str);
    // UPDATED: Show raw timespec structure
    printf("  Timespec:       tv_sec=%" PRId64 "  tv_nsec=%ld\n", (int64_t)ts_now.tv_sec, ts_now.tv_nsec);
    printf("  PPS Locked:     %s (Age: %" PRId64 " ms)\n", ts.synced ? "YES" : "NO", pps_age);
    printf("  NMEA Valid:     %s\n", ts.valid ? "YES" : "NO");
    printf("  Last Message:   %s\n", nmea_buf);

    return 0;
}

// ----------------------------------------------------------------------------
// Registration
// ----------------------------------------------------------------------------

void register_gps_cmd(void) {
    const esp_console_cmd_t cmd = {
        .command = "gps",
        .help = "GPS Tool: status",
        .hint = "<subcommand>",
        .func = &cmd_gps,
        .argtable = NULL
    };
    ESP_ERROR_CHECK(esp_console_cmd_register(&cmd));
}