#!/usr/bin/env node

'use strict';

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

const fs = require('fs');
const path = require('path');

// parse the args.
// Don't use nopt or whatever for this.  It's simple enough.

const args = process.argv.slice(2);
let format = 'json';
let template = null;
let inputFile = null;

args.forEach((arg) => {
  if (!arg.match(/^--/)) {
    inputFile = arg;
  } else if (arg.match(/^--format=/)) {
    format = arg.replace(/^--format=/, '');
  } else if (arg.match(/^--template=/)) {
    template = arg.replace(/^--template=/, '');
  }
});


if (!inputFile) {
  throw new Error('No input file specified');
}


console.error('Input file = %s', inputFile);
fs.readFile(inputFile, 'utf8', (er, input) => {
  if (er) throw er;
  // process the input for @include lines
  processIncludes(inputFile, input, next);
});


const includeExpr = /^@include\s+([A-Za-z0-9-_/]+)(?:\.)?([a-zA-Z]*)$/gmi;
const includeData = {};
const processIncludes = (inputFile, input, cb) => {
  const includes = input.match(includeExpr);
  if (includes == null) return cb(null, input);
  let errState = null;
  console.error(includes);
  let incCount = includes.length;
  if (incCount === 0) cb(null, input);

  includes.forEach((include) => {
    let fname = include.replace(/^@include\s+/, '');
    if (!fname.match(/\.md$/)) fname += '.md';

    if (Object.prototype.hasOwnProperty.call(includeData, fname)) {
      input = input.split(include).join(includeData[fname]);
      incCount--;
      if (incCount === 0) {
        return cb(null, input);
      }
    }

    const fullFname = path.resolve(path.dirname(inputFile), fname);
    fs.readFile(fullFname, 'utf8', (er, inc) => {
      if (errState) return;
      if (er) return cb(errState = er);
      processIncludes(fullFname, inc, (er, inc) => {
        if (errState) return;
        if (er) return cb(errState = er);
        incCount--;
        includeData[fname] = inc;
        input = input.split(include).join(includeData[fname]);
        if (incCount === 0) {
          return cb(null, input);
        }
      });
    });
  });
};


const next = (er, input) => {
  if (er) throw er;
  switch (format) {
    case 'json':
      require('./json.js')(input, inputFile, (er, obj) => {
        console.log(JSON.stringify(obj, null, 2));
        if (er) throw er;
      });
      break;

    case 'html':
      require('./html.js')(input, inputFile, template, (er, html) => {
        if (er) throw er;
        console.log(html);
      });
      break;

    default:
      throw new Error(`Invalid format: ${format}`);
  }
};