/*
 * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
 * 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 project 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 OWNER 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 <sys/types.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/param.h>
#include <np/lex.h>
#include <np/parse.h>
#include <os/np.h>

#define pr_trace(fmt, ...) printf("pirho.parse: " fmt, ##__VA_ARGS__)
#define pr_error(fmt, ...) printf("pirho.parse: error: " fmt, ##__VA_ARGS__)

/* Token to string conversion table */
static const char *stoktab[] = {
    /* Symbols */
    [TT_LPAREN] = "<TT_LPAREN>",
    [TT_RPAREN] = "<TT_RPAREN>",
    [TT_IDENT]  = "<IDENTIFIER>",
    [TT_COMMA]  = "<TT_COMMA>",
    [TT_STAR]   = "<TT_STAR>",
    [TT_MINUS]  = "<TT_MINUS>",
    [TT_PLUS]   = "<TT_PLUS>",
    [TT_SLASH]  = "<TT_SLASH>",
    [TT_EQUALS] = "<TT_EQUALS>",
    [TT_GT]     = "<TT_GREATER>",
    [TT_LT]     = "<TT_LESSTHAN>",
    [TT_LBRACK] = "<TT_LBRACK>",
    [TT_RBRACK] = "<TT_RBRACK>",

    /* Types */
    [TT_U8]     = "<TT_U8>",

    /* Values */
    [TT_NUMBER] = "<TT_NUMBER>",

    /* Keywords */
    [TT_BEGIN]  = "<TT_BEGIN>",
    [TT_PROC]   = "<TT_PROC>",
    [TT_END]    = "<TT_END>"
};

int
parse_work(struct np_work *work)
{
    struct lex_token tok;
    int error = 0;

    if (work == NULL) {
        pr_error("bad work argument\n");
        return -EINVAL;
    }

    while (error == 0) {
        error = lex_nom(work, &tok);
        if (error < 0) {
            return error;
        }

        /* Don't overflow the table */
        if (tok.token > NELEM(stoktab)) {
            pr_error("bad token %d\n", tok.token);
            return -1;
        }

        /* Log the token */
        printf("tok.type: %s\n", stoktab[tok.token]);
        if (tok.token == TT_NUMBER) {
            printf("tok.val: %d\n", tok.val);
        }
    }

    return 0;
}