#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "parsing.h"
#include "espfs.h"

static size_t espfs_parse_filesize = -1;
static int espfs_parse_fd = -1;

/**
 * Parse an image file and show the files contained.
 * This is a simple sanity test.
 *
 * @param[in] filename - image file to parse
 */
void parseEspfsFileAndShowItsContents(const char *filename)
{
    int rv;
    fprintf(stderr, "Parsing: %s\n", filename);

    FILE *f = fopen(filename, "r");
    if (!f) {
        perror(filename);
        exit(1);
    }
    int fd = fileno(f);

    espfs_parse_filesize = lseek(fd, 0, SEEK_END);
    lseek(fd, 0, SEEK_SET);

    espfs_parse_fd = fd;

    rv = espFsInit();
    if (rv != 0) {
        fprintf(stderr, "Fail to init FS\n");
        exit(1);
    }

    EspFsWalk walk;
    espFsWalkInit(&walk);

    EspFsHeader header;
    uint32_t offset;
    char namebuf[1024];

    while (espFsWalkNext(&walk, &header, namebuf, 1024, &offset)) {
        fprintf(stderr, "at %04x: \"%s\", flags: %02x, comp: %s, compLen: %d, plainLen: %d\n", offset, namebuf, header.flags,
                header.compression == 1 ? "HS" : "None", header.fileLenComp, header.fileLenDecomp);
    }

    fclose(f);
}


int httpdPlatEspfsRead(void *dest, uint32_t offset, size_t len)
{
    // fprintf(stderr, "FS read @ %d, len %d\n", offset, (int) len);
    if (offset + len > espfs_parse_filesize) {
        // fprintf(stderr, "Read out fo range!\n");
        return -1;
    }
    lseek(espfs_parse_fd, offset, SEEK_SET);
    read(espfs_parse_fd, dest, len);
    return 0;
}