/**
 * Copyright (c) 2026 Dominic Masters
 * 
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#include "asset/asset.h"
#include "engine/engine.h"
#include "util/string.h"
#include "assert/assert.h"

errorret_t assetInitLinux(void) {
  // Engine may have been provided the launch path
  if(ENGINE.argc > 0) {
    // Get the directory of the executable
    char_t buffer[ASSET_FILE_PATH_MAX];
    stringCopy(buffer, ENGINE.argv[0], ASSET_FILE_PATH_MAX);
    size_t len = strlen(buffer);

    // Normalize slashes
    for(size_t i = 0; i < ASSET_FILE_PATH_MAX; i++) {
      if(buffer[i] == '\0') break;
      if(buffer[i] == '\\') buffer[i] = '/';
    }

    // Now find the last slash
    char_t *end = buffer + len - 1;
    do {
      end--;
      if(*end == '/') {
        *end = '\0';
        break;
      }
    } while(end != buffer);
    

    // Did we find a slash?
    if(end != buffer) {
      // We found the directory, set as system path
      stringCopy(ASSET.platform.systemPath, buffer, ASSET_FILE_PATH_MAX);
    }
  }

  // Default system path, intended to be overridden by the platform
  stringCopy(ASSET.platform.systemPath, ".", ASSET_FILE_PATH_MAX);

  // Open zip file
  char_t searchPath[ASSET_FILE_PATH_MAX];
  const char_t **path = ASSET_LINUX_SEARCH_PATHS;
  int32_t error;
  do {
    char_t temp[ASSET_FILE_PATH_MAX];
    snprintf(
      temp,
      ASSET_FILE_PATH_MAX,
      *path,
      ASSET_FILE_NAME
    );
    // Ensure combined length does not exceed ASSET_FILE_PATH_MAX
    size_t syslen = strlen(ASSET.platform.systemPath);
    size_t slashlen = 1; // for '/'
    size_t max_temp = ASSET_FILE_PATH_MAX - syslen - slashlen - 1; // -1 for null terminator
    if(strlen(temp) > max_temp) {
      temp[max_temp] = '\0';
    }
    snprintf(
      searchPath,
      ASSET_FILE_PATH_MAX,
      "%s/%s",
      ASSET.platform.systemPath,
      temp
    );

    // Try open
    ASSET.zip = zip_open(searchPath, ZIP_RDONLY, &error);
    if(ASSET.zip == NULL) continue;
    if(error != 0) {
      printf("Opened asset file with non-zero error code: %d\n", error);
      ASSET.zip = NULL;
      continue;
    }
    break;// Found!
  } while(*(++path) != NULL);

  // Did we open the asset?
  if(ASSET.zip == NULL) {
    errorThrow("Failed to open asset file.");
  }

  errorOk();
}

errorret_t assetDisposeLinux(void) {
  errorOk();
}