#include "tree_sitter/parser.h"
#include "runtime/node.h"
#include "runtime/tree.h"
#include "runtime/length.h"
#include "runtime/parser.h"
#include "runtime/string_input.h"
#include "runtime/document.h"

TSDocument *ts_document_make() {
  TSDocument *document = calloc(sizeof(TSDocument), 1);
  document->parser = ts_parser_make();
  return document;
}

void ts_document_free(TSDocument *self) {
  ts_parser_destroy(&self->parser);
  if (self->tree)
    ts_tree_release(self->tree);
  free(self);
}

const TSLanguage *ts_document_language(TSDocument *self) {
  return self->parser.language;
}

void ts_document_set_language(TSDocument *self, const TSLanguage *language) {
  self->parser.language = language;
  self->tree = NULL;
}

TSDebugger ts_document_debugger(const TSDocument *self) {
  return ts_parser_debugger(&self->parser);
}

void ts_document_set_debugger(TSDocument *self, TSDebugger debugger) {
  ts_parser_set_debugger(&self->parser, debugger);
}

TSInput ts_document_input(TSDocument *self) {
  return self->input;
}

void ts_document_set_input(TSDocument *self, TSInput input) {
  self->input = input;
}

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

void ts_document_edit(TSDocument *self, TSInputEdit edit) {
  if (!self->tree)
    return;

  size_t max_chars = ts_tree_total_size(self->tree).chars;
  if (edit.position > max_chars)
    edit.position = max_chars;
  if (edit.chars_removed > max_chars - edit.position)
    edit.chars_removed = max_chars - edit.position;

  ts_tree_edit(self->tree, edit);
}

void ts_document_parse(TSDocument *self) {
  if (self->input.read_fn && self->parser.language) {
    TSTree *tree = ts_parser_parse(&self->parser, self->input, self->tree);
    if (self->tree)
      ts_tree_release(self->tree);
    self->tree = tree;
    ts_tree_retain(tree);
    self->parse_count++;
  }
}

TSNode ts_document_root_node(const TSDocument *self) {
  TSNode result = ts_node_make(self->tree, ts_length_zero());
  while (result.data && !ts_tree_is_visible(result.data))
    result = ts_node_named_child(result, 0);
  return result;
}

size_t ts_document_parse_count(const TSDocument *self) {
  return self->parse_count;
}