#include "pg_query.h"

#include "pg_query_internal.h"

#include "pg_query_outfuncs.h"

#include "parser/parser.h"

#include "parser/scanner.h"

#include "parser/scansup.h"

#include <unistd.h>

#include <fcntl.h>

PgQueryInternalParsetreeAndError pg_query_raw_parse(const char* input)

{

  PgQueryInternalParsetreeAndError result = {0};

  MemoryContext parse_context = CurrentMemoryContext;

  char stderr_buffer[STDERR_BUFFER_LEN + 1] = {0};

#ifndef DEBUG

  int stderr_global;

  int stderr_pipe[2];

#endif

#ifndef DEBUG

  // Setup pipe for stderr redirection

  if (pipe(stderr_pipe) != 0) {

    PgQueryError* error = malloc(sizeof(PgQueryError));

    error->message = strdup("Failed to open pipe, too many open file descriptors")

    result.error = error;

    return result;

  }

  fcntl(stderr_pipe[0], F_SETFL, fcntl(stderr_pipe[0], F_GETFL) | O_NONBLOCK);

  // Redirect stderr to the pipe

  stderr_global = dup(STDERR_FILENO);

  dup2(stderr_pipe[1], STDERR_FILENO);

  close(stderr_pipe[1]);

#endif

  PG_TRY();

  {

    result.tree = raw_parser(input, RAW_PARSE_DEFAULT);

#ifndef DEBUG

    // Save stderr for result

    read(stderr_pipe[0], stderr_buffer, STDERR_BUFFER_LEN);

#endif

    result.stderr_buffer = strdup(stderr_buffer);

  }

  PG_CATCH();

  {

    ErrorData* error_data;

    PgQueryError* error;

    MemoryContextSwitchTo(parse_context);

    error_data = CopyErrorData();

    // Note: This is intentionally malloc so exiting the memory context doesn't free this

    error = malloc(sizeof(PgQueryError));

    error->message   = strdup(error_data->message);

    error->filename  = strdup(error_data->filename);

    error->funcname  = strdup(error_data->funcname);

    error->context   = NULL;

    error->lineno    = error_data->lineno;

    error->cursorpos = error_data->cursorpos;

    result.error = error;

    FlushErrorState();

  }

  PG_END_TRY();

#ifndef DEBUG

  // Restore stderr, close pipe

  dup2(stderr_global, STDERR_FILENO);

  close(stderr_pipe[0]);

  close(stderr_global);

#endif

  return result;

}

PgQueryParseResult pg_query_parse(const char* input)

{

  MemoryContext ctx = NULL;

  PgQueryInternalParsetreeAndError parsetree_and_error;

  PgQueryParseResult result = {0};

  char *tree_json = NULL;

  ctx = pg_query_enter_memory_context();

  parsetree_and_error = pg_query_raw_parse(input);

  // These are all malloc-ed and will survive exiting the memory context, the caller is responsible to free them now

  result.stderr_buffer = parsetree_and_error.stderr_buffer;

  result.error = parsetree_and_error.error;

  tree_json = pg_query_nodes_to_json(parsetree_and_error.tree);

  result.parse_tree = strdup(tree_json);

  pfree(tree_json);

  pg_query_exit_memory_context(ctx);

  return result;

}

PgQueryProtobufParseResult pg_query_parse_protobuf(const char* input)

{

  MemoryContext ctx = NULL;

  PgQueryInternalParsetreeAndError parsetree_and_error;

  PgQueryProtobufParseResult result = {};

  ctx = pg_query_enter_memory_context();

  parsetree_and_error = pg_query_raw_parse(input);

  // These are all malloc-ed and will survive exiting the memory context, the caller is responsible to free them now

  result.stderr_buffer = parsetree_and_error.stderr_buffer;

  result.error = parsetree_and_error.error;

  result.parse_tree = pg_query_nodes_to_protobuf(parsetree_and_error.tree);

  pg_query_exit_memory_context(ctx);

  return result;

}

void pg_query_free_parse_result(PgQueryParseResult result)

{

  if (result.error) {

    pg_query_free_error(result.error);

  }

  free(result.parse_tree);

  free(result.stderr_buffer);

}

void pg_query_free_protobuf_parse_result(PgQueryProtobufParseResult result)

{

  if (result.error) {

    pg_query_free_error(result.error);

  }

  free(result.parse_tree.data);

  free(result.stderr_buffer);

}