/*
 * cmd_sdcard.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
 * 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 "esp_console.h"
#include "argtable3/argtable3.h"
#include "app_console.h"
#include "sd_card.h"
#include "sdcard_http.h"

#define SDCARD_READ_BUF_SIZE 4096
#define SDCARD_SEND_CHUNK   256
#define SDCARD_SEND_MAX     (512 * 1024)  /* 512 KB max over serial */

/* Format bytes as human-readable (e.g. 1.2K, 4.5M). Writes into buf, max len chars. */
static void fmt_size_human(size_t bytes, char *buf, size_t len) {
    if (bytes < 1024) {
        snprintf(buf, len, "%zu B", bytes);
    } else if (bytes < 1024 * 1024) {
        snprintf(buf, len, "%.1f K", bytes / 1024.0);
    } else if (bytes < 1024ULL * 1024 * 1024) {
        snprintf(buf, len, "%.1f M", bytes / (1024.0 * 1024.0));
    } else {
        snprintf(buf, len, "%.1f G", bytes / (1024.0 * 1024.0 * 1024.0));
    }
}

static int do_sdcard_status(int argc, char **argv) {
    (void)argc;
    (void)argv;

    printf("SD Card Status:\n");
    printf("  CD (Card Detect):  ");
    if (sd_card_cd_available()) {
        int level = sd_card_cd_get_level();
        bool inserted = sd_card_cd_is_inserted();
        printf("%s (GPIO=%s)\n", inserted ? "INSERTED" : "REMOVED",
               level >= 0 ? (level ? "HIGH" : "LOW") : "?");
        if (!inserted && sd_card_is_ready()) {
            printf("  (Card works but CD says REMOVED: wire CD to J1 Pin 12, or menuconfig -> SD Card -> uncheck 'LOW = inserted')\n");
        }
    } else {
        printf("N/A (pin not configured)\n");
    }
    printf("  Mounted:           %s\n", sd_card_is_ready() ? "yes" : "no");

    if (sd_card_is_ready()) {
        uint64_t total = 0, free_bytes = 0;
        if (sd_card_get_info(&total, &free_bytes) == 0) {
            printf("  Total:             %.2f MB\n", total / (1024.0 * 1024.0));
            printf("  Free:              %.2f MB\n", free_bytes / (1024.0 * 1024.0));
        }
        if (sd_card_file_exists("fiwi-telemetry")) {
            size_t sz = 0;
            if (sd_card_get_file_size("fiwi-telemetry", &sz) == 0) {
                char hr[16];
                fmt_size_human(sz, hr, sizeof(hr));
                printf("  fiwi-telemetry:    yes, %s (%zu bytes)\n", hr, sz);
            } else {
                printf("  fiwi-telemetry:    yes, ?\n");
            }
        } else {
            printf("  fiwi-telemetry:    none\n");
        }
        uint32_t attempts = 0, downloads = 0;
        sdcard_http_get_telemetry_stats(&attempts, &downloads);
        printf("  telemetry HTTP:    %" PRIu32 " attempts, %" PRIu32 " downloads\n", attempts, downloads);
        printf("  telemetry-status:  %s (timestamps + bytes per download)\n",
               sd_card_file_exists("telemetry-status") ? "yes" : "none");
    }
    return 0;
}

static int do_sdcard_write(int argc, char **argv) {
    if (argc < 3) {
        printf("Usage: sdcard write <file> <text...>\n");
        return 1;
    }
    const char *filename = argv[1];

    if (!sd_card_is_ready()) {
        printf("Error: SD card not mounted\n");
        return 1;
    }

    /* Join argv[2]..argv[argc-1] with spaces for multi-word text */
    static char text_buf[512];
    size_t off = 0;
    for (int i = 2; i < argc && off < sizeof(text_buf) - 2; i++) {
        if (i > 2) {
            text_buf[off++] = ' ';
        }
        size_t len = strlen(argv[i]);
        if (off + len >= sizeof(text_buf)) {
            len = sizeof(text_buf) - off - 1;
        }
        memcpy(text_buf + off, argv[i], len);
        off += len;
    }
    text_buf[off] = '\0';

    esp_err_t ret = sd_card_write_file(filename, text_buf, off, false);
    if (ret != 0) {
        printf("Write failed: %s\n", esp_err_to_name(ret));
        return 1;
    }
    printf("Wrote %zu bytes to %s\n", off, filename);
    return 0;
}

static int do_sdcard_read(int argc, char **argv) {
    if (argc < 2) {
        printf("Usage: sdcard read <file>\n");
        return 1;
    }
    const char *filename = argv[1];

    if (!sd_card_is_ready()) {
        printf("Error: SD card not mounted\n");
        return 1;
    }

    if (!sd_card_file_exists(filename)) {
        printf("Error: File not found: %s\n", filename);
        return 1;
    }

    static uint8_t buf[SDCARD_READ_BUF_SIZE];
    size_t bytes_read = 0;
    esp_err_t ret = sd_card_read_file(filename, buf, sizeof(buf) - 1, &bytes_read);
    if (ret != 0) {
        printf("Read failed: %s\n", esp_err_to_name(ret));
        return 1;
    }
    buf[bytes_read] = '\0';
    printf("Read %zu bytes from %s:\n", bytes_read, filename);
    printf("---\n%s\n---\n", (char *)buf);
    return 0;
}

/* Serial file transfer: output hex-encoded file for host script (e.g. sdcard_recv.py) */
static int do_sdcard_send(int argc, char **argv) {
    if (argc < 2) {
        printf("Usage: sdcard send <file>\n");
        printf("  Streams file over serial (hex). Use tools/sdcard_recv.py on host to receive.\n");
        return 1;
    }
    const char *filename = argv[1];

    if (!sd_card_is_ready()) {
        printf("Error: SD card not mounted\n");
        return 1;
    }
    if (!sd_card_file_exists(filename)) {
        printf("Error: File not found: %s\n", filename);
        return 1;
    }

    size_t file_size = 0;
    if (sd_card_get_file_size(filename, &file_size) != 0) {
        printf("Error: Could not get file size\n");
        return 1;
    }
    if (file_size > SDCARD_SEND_MAX) {
        printf("Error: File too large for serial transfer (max %u KB)\n", (unsigned)(SDCARD_SEND_MAX / 1024));
        return 1;
    }

    /* Protocol: ---SDFILE--- \n filename \n SIZE: N \n ---HEX--- \n <hex lines> ---END SDFILE--- */
    printf("---SDFILE---\n%s\nSIZE:%zu\n---HEX---\n", filename, file_size);
    fflush(stdout);

    static uint8_t chunk[SDCARD_SEND_CHUNK];
    size_t offset = 0;
    while (offset < file_size) {
        size_t to_read = file_size - offset;
        if (to_read > sizeof(chunk)) {
            to_read = sizeof(chunk);
        }
        size_t n = 0;
        if (sd_card_read_file_at(filename, offset, chunk, to_read, &n) != 0 || n == 0) {
            printf("\nError: Read failed at offset %zu\n", offset);
            return 1;
        }
        for (size_t i = 0; i < n; i++) {
            printf("%02x", (unsigned char)chunk[i]);
        }
        printf("\n");
        fflush(stdout);
        offset += n;
    }
    printf("---END SDFILE---\n");
    fflush(stdout);
    return 0;
}

static int do_sdcard_list(int argc, char **argv) {
    const char *path = (argc >= 2) ? argv[1] : "";

    if (!sd_card_is_ready()) {
        printf("Error: SD card not mounted\n");
        return 1;
    }

    printf("SD card: %s\n", path[0] ? path : "/");
    esp_err_t ret = sd_card_list_dir(path);
    if (ret != ESP_OK) {
        printf("Error: Cannot list directory: %s\n", esp_err_to_name(ret));
        return 1;
    }
    return 0;
}

static int do_sdcard_delete(int argc, char **argv) {
    if (argc < 2) {
        printf("Usage: sdcard delete <file>\n");
        return 1;
    }
    const char *filename = argv[1];

    if (!sd_card_is_ready()) {
        printf("Error: SD card not mounted\n");
        return 1;
    }
    if (!sd_card_file_exists(filename)) {
        printf("Error: File not found: %s\n", filename);
        return 1;
    }

    esp_err_t ret = sd_card_delete_file(filename);
    if (ret != ESP_OK) {
        printf("Error: Delete failed: %s\n", esp_err_to_name(ret));
        return 1;
    }
    printf("Deleted: %s\n", filename);
    return 0;
}

static int cmd_sdcard(int argc, char **argv) {
    if (argc < 2) {
        printf("Usage: sdcard <status|list|write|read|send|delete> [args]\n");
        printf("  status          - Show CD, mounted, capacity\n");
        printf("  list [path]     - List files (path optional, default root)\n");
        printf("  write <f> <t>   - Write text to file\n");
        printf("  read <f>        - Read and print file\n");
        printf("  send <f>        - Stream file over serial (use tools/sdcard_recv.py)\n");
        printf("  delete <f>      - Delete a file\n");
        return 0;
    }
    if (strcmp(argv[1], "status") == 0) {
        return do_sdcard_status(argc - 1, &argv[1]);
    }
    if (strcmp(argv[1], "list") == 0 || strcmp(argv[1], "ls") == 0) {
        return do_sdcard_list(argc - 1, &argv[1]);
    }
    if (strcmp(argv[1], "write") == 0) {
        return do_sdcard_write(argc - 1, &argv[1]);
    }
    if (strcmp(argv[1], "read") == 0) {
        return do_sdcard_read(argc - 1, &argv[1]);
    }
    if (strcmp(argv[1], "send") == 0) {
        return do_sdcard_send(argc - 1, &argv[1]);
    }
    if (strcmp(argv[1], "delete") == 0 || strcmp(argv[1], "rm") == 0) {
        return do_sdcard_delete(argc - 1, &argv[1]);
    }
    printf("Unknown subcommand '%s'\n", argv[1]);
    return 1;
}

void register_sdcard_cmd(void) {
    const esp_console_cmd_t cmd = {
        .command = "sdcard",
        .help = "SD card: status, list [path], write, read, send, delete <file>",
        .hint = "<status|list|write|read|send|delete>",
        .func = &cmd_sdcard,
    };
    ESP_ERROR_CHECK(esp_console_cmd_register(&cmd));
}