/*
 *
 * Copyright 2015, Google Inc.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
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 * 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
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 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */

#include <string.h>

#include <grpc/support/alloc.h>
#include <grpc/support/useful.h>
#include <grpc/support/log.h>
#include "src/core/json/json.h"
#include "src/core/support/string.h"

#include "test/core/util/test_config.h"

typedef struct testing_pair {
  const char* input;
  const char* output;
} testing_pair;

static testing_pair testing_pairs[] = {
  /* Testing valid parsing. */

  /* Testing trivial parses, with de-indentation. */
  { " 0 ", "0" },
  { " 1 ", "1" },
  { " \"a\" ", "\"a\"" },
  { " true ", "true" },
  /* Testing the parser's ability to decode trivial UTF-16. */
  { "\"\\u0020\\\\\\u0010\\u000a\\u000D\"", "\" \\\\\\u0010\\n\\r\"" },
  /* Testing various UTF-8 sequences. */
  { "\"ßâñć௵⇒\"", "\"\\u00df\\u00e2\\u00f1\\u0107\\u0bf5\\u21d2\"" },
  { "\"\\u00df\\u00e2\\u00f1\\u0107\\u0bf5\\u21d2\"", "\"\\u00df\\u00e2\\u00f1\\u0107\\u0bf5\\u21d2\"" },
  /* Testing UTF-8 character "𝄞", U+11D1E. */
  { "\"\xf0\x9d\x84\x9e\"", "\"\\ud834\\udd1e\"" },
  { "\"\\ud834\\udd1e\"", "\"\\ud834\\udd1e\"" },
  /* Testing nested empty containers. */
  { " [ [ ] , { } , [ ] ] ", "[[],{},[]]", },
  /* Testing escapes and control chars in key strings. */
  { " { \"\x7f\\n\\\\a , b\": 1, \"\": 0 } ", "{\"\\u007f\\n\\\\a , b\":1,\"\":0}" },
  /* Testing the writer's ability to cut off invalid UTF-8 sequences. */
  { "\"abc\xf0\x9d\x24\"", "\"abc\"" },
  { "\"\xff\"", "\"\"" },
  /* Testing valid number parsing. */
  { "[0, 42 , 0.0123, 123.456]", "[0,42,0.0123,123.456]"},
  { "[1e4,-53.235e-31, 0.3e+3]", "[1e4,-53.235e-31,0.3e+3]" },
  /* Testing keywords parsing. */
  { "[true, false, null]", "[true,false,null]" },


  /* Testing invalid parsing. */

  /* Testing plain invalid things, exercising the state machine. */
  { "\\", NULL },
  { "nu ll", NULL },
  { "fals", NULL },
  /* Testing unterminated string. */
  { "\"\\x", NULL },
  /* Testing invalid UTF-16 number. */
  { "\"\\u123x", NULL },
  /* Testing imbalanced surrogate pairs. */
  { "\"\\ud834f", NULL },
  { "\"\\ud834\\n", NULL },
  { "\"\\udd1ef", NULL },
  { "\"\\ud834\\ud834\"", NULL },
  { "\"\\ud834\\u1234\"", NULL },
  /* Testing embedded invalid whitechars. */
  { "\"\n\"", NULL },
  { "\"\t\"", NULL },
  /* Testing empty json data. */
  { "", NULL },
  /* Testing extra characters after end of parsing. */
  { "{},", NULL },
  /* Testing imbalanced containers. */
  { "{}}", NULL },
  { "[]]", NULL },
  { "{{}", NULL },
  { "[[]", NULL },
  { "[}", NULL },
  { "{]", NULL },
  /*Testing trailing comma. */
  { "{,}", NULL },
  { "[1,2,3,4,]", NULL },
  /* Testing having a key syntax in an array. */
  { "[\"x\":0]", NULL },
  /* Testing invalid numbers. */
  { "1.", NULL },
  { "1e", NULL },
  { ".12", NULL },
  { "1.x", NULL },
  { "1.12x", NULL },
  { "1ex", NULL },
  { "1e12x", NULL },
  { ".12x", NULL },
  { "000", NULL },
};

static void test_pairs() {
  unsigned i;

  for (i = 0; i < GPR_ARRAY_SIZE(testing_pairs); i++) {
    testing_pair* pair = testing_pairs + i;
    char* scratchpad = gpr_strdup(pair->input);
    grpc_json* json;

    gpr_log(GPR_INFO, "parsing string %i - should %s", i,
            pair->output ? "succeed" : "fail");
    json = grpc_json_parse_string(scratchpad);

    if (pair->output) {
      char* output;

      GPR_ASSERT(json);
      output = grpc_json_dump_to_string(json, 0);
      GPR_ASSERT(output);
      gpr_log(GPR_INFO, "succeeded with output = %s", output);
      GPR_ASSERT(strcmp(output, pair->output) == 0);

      grpc_json_destroy(json);
      gpr_free(output);
    } else {
      gpr_log(GPR_INFO, "failed");
      GPR_ASSERT(!json);
    }

    gpr_free(scratchpad);
  }
}

static void test_atypical() {
  char* scratchpad = gpr_strdup("[[],[]]");
  grpc_json* json = grpc_json_parse_string(scratchpad);
  grpc_json* brother;

  GPR_ASSERT(json);
  GPR_ASSERT(json->child);
  brother = json->child->next;
  grpc_json_destroy(json->child);
  json->child = brother;
  grpc_json_destroy(json);
  gpr_free(scratchpad);
}

int main(int argc, char **argv) {
  grpc_test_init(argc, argv);
  test_pairs();
  test_atypical();
  gpr_log(GPR_INFO, "json_test success");
  return 0;
}