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/*
 * msg
 * Copyright (C) 2025  Raghuram Subramani <raghus2247@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#define _GNU_SOURCE

#include <config.h>
#include <copy.h>
#include <engine.h>
#include <filehandler.h>
#include <lexer.h>
#include <list.h>
#include <msg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <util.h>

extern msg_t *msg;

engine_t *
engine_ingest(char **buffer)
{
  engine_t *engine = malloc(sizeof(engine_t));
  engine->config = NULL;

  char *p = strstr(*buffer, "---");
  if (p != NULL) {
    char *config;
    asprintf(&config, "%.*s\n", (int) (p - *buffer), *buffer);
    engine->config = config_parse(config);
    free(config);

    char *tempbuffer = strdup(p);

    free(*buffer);
    asprintf(buffer, "%s", tempbuffer + strlen("---"));

    free(tempbuffer);
  }

  key_match_t *match;
  engine->content_headers = list_create(sizeof(contentfor_operand_t));
  if (engine->content_headers == NULL) {
    printf("Could not create content_headers\n");
    return NULL;
  }

  size_t skip = 0;
  while (true) {
    match = find_next_key(*buffer, skip);
    if (match == NULL)
      break;

#ifdef DEBUG
    printf("Match: %.*s LENGTH(%d) OFFSET(%d)\n",
           match->length,
           *buffer + match->offset,
           match->length,
           match->offset);
#endif

    directive_t *directive = find_directive(*buffer, match);
    if (directive == NULL) {
      printf(
          "Unknown directive: %.*s\n", match->length, *buffer + match->offset);

      break;
    }

    switch (directive->type) {
    case INCLUDE:
      handle_include(buffer, match, directive);
      break;
    case CONTENTFOR:
      handle_contentfor(buffer, match, directive, engine->content_headers);
      break;
    case EACHDO:
      handle_eachdo(buffer, match, directive);
      break;

    case PUTPAGE:
      /* TODO: handle */
    case PUT:
    case ENDEACHDO:
    case BODY:
    case CONTENT:
    case ENDCONTENT:
    case _RAW:
      skip++;
      break;
    }

    directive_delete(directive);
    free(match);
  }

  return engine;
}

void
engine_delete(engine_t *engine)
{
  if (engine->config != NULL)
    config_delete(engine->config);

  for (size_t i = 0; i < engine->content_headers->size; i++) {
    contentfor_operand_t *operand = list_get(engine->content_headers, i);
    free(operand->content);
    free(operand->key);
  }
  list_delete(engine->content_headers);
  free(engine);
}