import { SyntaxNode } from 'web-tree-sitter';
import { VariableDefinitionFlag } from './definition-scope';
import * as NodeTypes from './node-types';

function filterWordNodes(nodes: SyntaxNode[]): SyntaxNode[] {
  return nodes.filter(n => n.type === 'word');
}

function _setHasQuery(nodes: SyntaxNode[]): boolean {
  const options = filterWordNodes(nodes).filter(NodeTypes.isOption);
  const queryFlag = new VariableDefinitionFlag('q', 'query');
  for (const option of options) {
    if (queryFlag.isMatch(option)) {
      return true;
    }
  }
  return false;
}

const shouldStop = (node: SyntaxNode): boolean => {
  return (
    NodeTypes.isCommand(node) ||
        NodeTypes.isComment(node) ||
        NodeTypes.isShebang(node) ||
        NodeTypes.isSemicolon(node) ||
        NodeTypes.isNewline(node)
  );
};
export function isPossible(node: SyntaxNode): boolean {
  return (
    node.type === 'variable_name' ||
        node.type === 'word'
  );
}

export function gatherVariableSiblings(node: SyntaxNode): SyntaxNode[] {
  const siblings = [];
  let next = node.nextSibling;
  while (next && !shouldStop(next)) {
    siblings.push(next);
    next = next.nextSibling;
  }
  return siblings;
}

export function isSetDefinitionNode(nodes: SyntaxNode[], match: SyntaxNode): boolean {
  //if (setHasQuery(nodes)) return false;
  for (const node of nodes) {
    if (NodeTypes.isOption(node)) {
      continue;
    }
    if (node.equals(match)) {
      return true;
    } else {
      return false;
    }
  }
  return false;
}

export function isReadDefinitionNode(siblings: SyntaxNode[], match: SyntaxNode): boolean {
  const readVariables: SyntaxNode[] = [];
  while (siblings.length > 0) {
    const current = siblings.pop();
    if (!current) {
      break;
    }
    if (NodeTypes.isOption(current) || NodeTypes.isString(current)) {
      break;
    }
    readVariables.push(current);
  }
  return readVariables.some(n => n.equals(match));
}

export function isFunctionArgumentDefinitionNode(siblings: SyntaxNode[], match: SyntaxNode): boolean {
  const argFlag = new VariableDefinitionFlag('a', 'argument-names');
  const args : SyntaxNode[] = [];
  for (let i = 0; i < siblings.length; i++) {
    const child = siblings[i];
    if (child && argFlag.isMatch(child)) {
      let varName = child.nextSibling;
      while (varName !== null && varName.type === 'word' && !varName.text.startsWith('-')) {
        args.push(varName);
        varName = varName.nextSibling;
      }
    }
  }
  return args.some(n => n.equals(match));
}

export function isForLoopDefinitionNode(siblings: SyntaxNode[], match: SyntaxNode) : boolean {
  const first = siblings[0];
  if (!first) {
    return false;
  }
  return first.type === 'variable_name' && first.equals(match) || false;
}