'use strict';

var utils = require('../utils.js');
require('eslint-visitor-keys');
require('espree');
require('estraverse');

function getPropName(context, propNode) {
  if (propNode.type === "JSXSpreadAttribute")
    return context.sourceCode.getText(propNode.argument);
  return propNode.name.name;
}
const messages = {
  newLine: "Prop `{{prop}}` must be placed on a new line"
};
var jsxMaxPropsPerLine = utils.createRule({
  name: "jsx-max-props-per-line",
  package: "jsx",
  meta: {
    type: "layout",
    docs: {
      description: "Enforce maximum of props on a single line in JSX"
    },
    fixable: "code",
    messages,
    schema: [{
      anyOf: [{
        type: "object",
        properties: {
          maximum: {
            type: "object",
            properties: {
              single: {
                type: "integer",
                minimum: 1
              },
              multi: {
                type: "integer",
                minimum: 1
              }
            }
          }
        },
        additionalProperties: false
      }, {
        type: "object",
        properties: {
          maximum: {
            type: "number",
            minimum: 1
          },
          when: {
            type: "string",
            enum: ["always", "multiline"]
          }
        },
        additionalProperties: false
      }]
    }]
  },
  create(context) {
    const configuration = context.options[0] || {};
    const maximum = configuration.maximum || 1;
    const maxConfig = typeof maximum === "number" ? {
      single: configuration.when === "multiline" ? Infinity : maximum,
      multi: maximum
    } : {
      single: maximum.single || Infinity,
      multi: maximum.multi || Infinity
    };
    function generateFixFunction(line, max) {
      const sourceCode = context.sourceCode;
      const output = [];
      const front = line[0].range[0];
      const back = line[line.length - 1].range[1];
      for (let i = 0; i < line.length; i += max) {
        const nodes = line.slice(i, i + max);
        output.push(nodes.reduce((prev, curr) => {
          if (prev === "")
            return sourceCode.getText(curr);
          return `${prev} ${sourceCode.getText(curr)}`;
        }, ""));
      }
      const code = output.join("\n");
      return function fix(fixer) {
        return fixer.replaceTextRange([front, back], code);
      };
    }
    return {
      JSXOpeningElement(node) {
        if (!node.attributes.length)
          return;
        const isSingleLineTag = node.loc.start.line === node.loc.end.line;
        if ((isSingleLineTag ? maxConfig.single : maxConfig.multi) === Infinity)
          return;
        const firstProp = node.attributes[0];
        const linePartitionedProps = [[firstProp]];
        node.attributes.reduce((last, decl) => {
          if (last.loc.end.line === decl.loc.start.line)
            linePartitionedProps[linePartitionedProps.length - 1].push(decl);
          else
            linePartitionedProps.push([decl]);
          return decl;
        });
        linePartitionedProps.forEach((propsInLine) => {
          const maxPropsCountPerLine = isSingleLineTag && propsInLine[0].loc.start.line === node.loc.start.line ? maxConfig.single : maxConfig.multi;
          if (propsInLine.length > maxPropsCountPerLine) {
            const name = getPropName(context, propsInLine[maxPropsCountPerLine]);
            context.report({
              messageId: "newLine",
              node: propsInLine[maxPropsCountPerLine],
              data: {
                prop: name
              },
              fix: generateFixFunction(propsInLine, maxPropsCountPerLine)
            });
          }
        });
      }
    };
  }
});

module.exports = jsxMaxPropsPerLine;