/*
 * 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 <time.h>
#include <inttypes.h>
#include "esp_log.h"
#include "esp_console.h"
#include "argtable3/argtable3.h"
#include "nvs_flash.h"
#include "nvs.h"
#include "gps_sync.h"
#include "app_console.h"

// ============================================================================
// COMMAND: gps (Configure & Status)
// ============================================================================

static struct {
    struct arg_lit *enable;
    struct arg_lit *disable;
    struct arg_lit *status;
    struct arg_lit *help;
    struct arg_end *end;
} gps_args;

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

    if (gps_args.help->count > 0) {
        printf("Usage: gps [--enable|--disable|--status]\n");
        return 0;
    }

    nvs_handle_t h;
    esp_err_t err = nvs_open("storage", NVS_READWRITE, &h);
    if (err != ESP_OK) {
        printf("Error opening NVS: %s\n", esp_err_to_name(err));
        return 1;
    }

    // --- HANDLE SETTERS ---
    bool changed = false;
    if (gps_args.enable->count > 0) {
        nvs_set_u8(h, "gps_enabled", 1);
        printf("GPS set to ENABLED. (Reboot required)\n");
        changed = true;
    } else if (gps_args.disable->count > 0) {
        nvs_set_u8(h, "gps_enabled", 0);
        printf("GPS set to DISABLED. (Reboot required)\n");
        changed = true;
    }

    if (changed) nvs_commit(h);

    // --- DISPLAY STATUS ---
    // 1. NVS State
    uint8_t val = 1;
    if (nvs_get_u8(h, "gps_enabled", &val) != ESP_OK) val = 1; // Default true
    printf("GPS NVS State: %s\n", val ? "ENABLED" : "DISABLED");
    nvs_close(h);

    // 2. Runtime Status
    if (val) {
        gps_timestamp_t ts = gps_get_timestamp();
        int64_t pps_age = gps_get_pps_age_ms();

        printf("Status:        %s\n", ts.synced ? "SYNCED" : "SEARCHING");

        // Print Raw NMEA
        char nmea_buf[128];
        gps_get_last_nmea(nmea_buf, sizeof(nmea_buf));

        // Cleanup CR/LF for printing
        size_t len = strlen(nmea_buf);
        if (len > 0 && (nmea_buf[len-1] == '\r' || nmea_buf[len-1] == '\n')) nmea_buf[len-1] = 0;
        if (len > 1 && (nmea_buf[len-2] == '\r' || nmea_buf[len-2] == '\n')) nmea_buf[len-2] = 0;

        printf("Last NMEA:     [%s]\n", nmea_buf);

        if (pps_age < 0) {
            printf("PPS Signal:    NEVER DETECTED\n");
        } else if (pps_age > 1100) {
            printf("PPS Signal:    LOST (Last seen %" PRId64 " ms ago)\n", pps_age);
        } else {
            printf("PPS Signal:    ACTIVE (Age: %" PRId64 " ms)\n", pps_age);
        }

        if (ts.gps_us > 0) {
            time_t now_sec = ts.gps_us / 1000000;
            struct tm tm_info;
            gmtime_r(&now_sec, &tm_info);
            char time_buf[64];
            strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S UTC", &tm_info);
            printf("Current Time:  %s\n", time_buf);
        } else {
            printf("Current Time:  <Unknown> (System Epoch)\n");
        }
    }

    app_console_update_prompt();
    return 0;
}

void register_gps_cmd(void) {
    gps_args.enable  = arg_lit0(NULL, "enable", "Enable GPS");
    gps_args.disable = arg_lit0(NULL, "disable", "Disable GPS");
    gps_args.status  = arg_lit0(NULL, "status", "Show Status");
    gps_args.help    = arg_lit0("h", "help", "Help");
    gps_args.end     = arg_end(2);

    const esp_console_cmd_t cmd = {
        .command = "gps",
        .help = "Configure GPS",
        .func = &cmd_gps,
        .argtable = &gps_args
    };
    ESP_ERROR_CHECK(esp_console_cmd_register(&cmd));
}