import _ from 'lodash';

const schema = [
  {
    enum: ['always', 'always-multiline', 'only-multiline', 'never'],
    type: 'string',
  },
  {
    enum: ['always', 'always-multiline', 'only-multiline', 'never'],
    type: 'string',
  },
  {
    enum: ['always', 'always-multiline', 'only-multiline', 'never'],
    type: 'string',
  },
];

// required for reporting the correct position
const getLast = (property, indexer) => {
  if (!property) {
    return indexer;
  }

  if (!indexer) {
    return property;
  }

  if (property.loc.end.line > indexer.loc.end.line) {
    return property;
  }

  if (indexer.loc.end.line > property.loc.end.line) {
    return indexer;
  }

  if (property.loc.end.column > indexer.loc.end.column) {
    return property;
  }

  return indexer;
};

const create = (context) => {
  const option = context.options[0] || 'never';
  const interfaceOption = context.options[1] || option;
  const inexactNotationOption = context.options[2] || 'never';
  const sourceCode = context.getSourceCode();

  const getNodeOption = (node) => {
    if (node.parent.type === 'InterfaceDeclaration') {
      return interfaceOption;
    }

    if (node.inexact) {
      return inexactNotationOption;
    }

    return option;
  };

  const reporter = (node, message, fix) => () => {
    context.report({
      fix,
      message,
      node,
    });
  };

  const makeReporters = (node, tokenToFix) => ({
    dangle: reporter(node, 'Unexpected trailing delimiter', (fixer) => fixer.replaceText(tokenToFix, '')),
    noDangle: reporter(node, 'Missing trailing delimiter', (fixer) => fixer.insertTextAfter(tokenToFix, ',')),
  });

  const evaluate = (node, lastChildNode) => {
    if (!lastChildNode && !node.inexact) {
      return;
    }

    const [penultimateToken, lastToken] = sourceCode.getLastTokens(node, 2);

    const isDangling = [';', ','].includes(penultimateToken.value);
    const isMultiLine = penultimateToken.loc.start.line !== lastToken.loc.start.line;

    // Use the object node if it's inexact since there's no child node for the inexact notation
    const report = makeReporters(node.inexact ? node : lastChildNode, penultimateToken);
    const nodeOption = getNodeOption(node);

    if (nodeOption === 'always' && !isDangling) {
      report.noDangle();

      return;
    }

    if (nodeOption === 'never' && isDangling) {
      report.dangle();

      return;
    }

    if (nodeOption === 'always-multiline' && !isDangling && isMultiLine) {
      report.noDangle();

      return;
    }

    if (nodeOption === 'always-multiline' && isDangling && !isMultiLine) {
      report.dangle();

      return;
    }

    if (nodeOption === 'only-multiline' && isDangling && !isMultiLine) {
      report.dangle();
    }
  };

  return {
    ObjectTypeAnnotation(node) {
      evaluate(node, getLast(_.last(node.properties), _.last(node.indexers)));
    },

    TupleTypeAnnotation(node) {
      evaluate(node, _.last(node.types));
    },
  };
};

export default {
  create,
  meta: {
    fixable: 'code',
  },
  schema,
};