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#include <string.h>

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#include "dbfs.h"

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#include "../lib/log.h"

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mode_t _dbfs_mode (const char *type) {

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    if (!strcmp(type, "DIR"))

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        return S_IFDIR;

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    if (!strcmp(type, "REG"))

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        return S_IFREG;

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    if (!strcmp(type, "LNK"))

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        return S_IFLNK;

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    else {

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        WARNING("[dbfs] weird mode-type: %s", type);

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        return 0;

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    }

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}

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int _dbfs_check_res (const struct evsql_result_info *res, size_t rows, size_t cols) {

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    int err = 0;

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    // check if it failed

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    if (res->error)

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        NERROR(evsql_result_error(res));

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    // not found?

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    if (evsql_result_rows(res) == 0 && evsql_result_affected(res) == 0)

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        SERROR(err = 1);

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    // duplicate rows?

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    if (rows && evsql_result_rows(res) != rows)

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        ERROR("wrong number of rows returned");

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    // correct number of columns

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    if (evsql_result_cols(res) != cols)

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        ERROR("wrong number of columns: %zu", evsql_result_cols(res));

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    // good

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    return 0;

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error:

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    if (!err)

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        err = -1;

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    return err;

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}

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int _dbfs_stat_info (struct stat *st, const struct evsql_result_info *res, size_t row, size_t col_offset) {

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    int err = 0;

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    uint16_t mode;

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    uint32_t size = 0;  // NULL for non-REG inodes

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    uint64_t nlink = 0; // will be NULL for non-GROUP BY queries

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    const char *type;

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    // extract the data

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    if ((0

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        ||  evsql_result_string(res, row, col_offset + 0, &type,       0 ) // inodes.type

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        ||  evsql_result_uint16(res, row, col_offset + 1, &mode,       0 ) // inodes.mode

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        ||  evsql_result_uint32(res, row, col_offset + 2, &size,       1 ) // size

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        ||  evsql_result_uint64(res, row, col_offset + 3, &nlink,      1 ) // count(*)

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    ) && (err = EIO))

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        ERROR("invalid db data");

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    INFO("\tst_mode=S_IF%s | %ho, st_nlink=%llu, st_size=%llu", type, mode, (long long unsigned int) nlink, (long long unsigned int) size);

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    // convert and store

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    st->st_mode = _dbfs_mode(type) | mode;

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    st->st_nlink = nlink;

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    st->st_size = size;

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    // good

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    return 0;

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error:

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    return err;

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}

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