import resolve, { toString, traverse, map } from '../resolve';
import error from './error';
import rollArray from './rollArray';
import rollDice from '/imports/parser/rollDice';
import STORAGE_LIMITS from '/imports/constants/STORAGE_LIMITS';

const rollNode = {
  create({ left, right }) {
    return {
      parseType: 'roll',
      left,
      right,
    };
  },
  compile(node, scope, context) {
    const { result: left } = resolve('compile', node.left, scope, context);
    const { result: right } = resolve('compile', node.right, scope, context);
    return {
      result: rollNode.create({ left, right }),
      context,
    };
  },
  toString(node) {
    if (
      node.left.valueType === 'number' && node.left.value === 1
    ) {
      return `d${toString(node.right)}`;
    } else {
      return `${toString(node.left)}d${toString(node.right)}`;
    }
  },
  roll(node, scope, context) {
    const { result: left } = resolve('reduce', node.left, scope, context);
    const { result: right } = resolve('reduce', node.right, scope, context);
    if (left.valueType !== 'number' && !Number.isInteger(left.value)) {
      return errorResult('Number of dice is not an integer', node, context);
    }
    if (right.valueType !== 'number' && !Number.isInteger(right.value)) {
      return errorResult('Dice size is not an integer', node, context);
    }
    let number = left.value;
    if (context.options.doubleRolls) {
      number *= 2;
    }
    if (number > STORAGE_LIMITS.diceRollValuesCount) {
      const message = `Can't roll more than ${STORAGE_LIMITS.diceRollValuesCount} dice at once`;
      return errorResult(message, node, context);
    }
    let diceSize = right.value;
    let values = rollDice(number, diceSize);
    if (context) {
      context.rolls.push({ number, diceSize, values });
    }
    return {
      result: rollArray.create({
        values,
        diceSize,
        diceNum: left.value,
      }),
      context
    };
  },
  reduce(node, scope, context) {
    const { result } = rollNode.roll(node, scope, context);
    return resolve('reduce', result, scope, context);
  },
  traverse(node, fn) {
    fn(node);
    traverse(node.left, fn);
    traverse(node.right, fn);
  },
  map(node, fn) {
    const resultingNode = fn(node);
    if (resultingNode === node) {
      node.left = map(node.left, fn);
      node.right = map(node.right, fn);
    }
    return resultingNode;
  },
}

function errorResult(message, node, context) {
  context.error(message);
  return {
    result: error.create({ node, error: message }),
    context,
  };
}

export default rollNode;