#include "tree_sitter/parser.h"
#include "runtime/node.h"
#include "runtime/parser.h"
#include "runtime/string_input.h"

struct TSDocument {
  TSParser parser;
  TSInput input;
  TSNode *node;
};

TSDocument *ts_document_make() {
  return calloc(sizeof(TSDocument), 1);
}

void ts_document_free(TSDocument *document) {
  ts_parser_destroy(&document->parser);
  if (document->input.release_fn)
    document->input.release_fn(document->input.data);
  if (document->node)
    ts_node_release(document->node);
  free(document);
}

static void reparse(TSDocument *document, TSInputEdit *edit) {
  if (document->input.read_fn && document->parser.language) {
    const TSTree *tree =
        ts_parser_parse(&document->parser, document->input, edit);
    if (document->node)
      ts_node_release(document->node);
    document->node =
        ts_node_make_root(tree, document->parser.language->symbol_names);
  }
}

void ts_document_set_language(TSDocument *document,
                              const TSLanguage *language) {
  ts_parser_destroy(&document->parser);
  document->parser = ts_parser_make(language);
  reparse(document, NULL);
}

void ts_document_set_input(TSDocument *document, TSInput input) {
  document->input = input;
  reparse(document, NULL);
}

void ts_document_edit(TSDocument *document, TSInputEdit edit) {
  reparse(document, &edit);
}

const char *ts_document_symbol_name(const TSDocument *document,
                                    const TSTree *tree) {
  return document->parser.language->symbol_names[tree->symbol];
}

void ts_document_set_input_string(TSDocument *document, const char *text) {
  ts_document_set_input(document, ts_string_input_make(text));
}

TSNode *ts_document_root_node(const TSDocument *document) {
  return document->node;
}