var JSONUtils = require('../../json');
var PathUtils = require('../../utils/path');
var Modifiers = require('../modifiers');
var writeFile = require('../helper/writeFile');
var getModifiers = require('../getModifiers');

var JSON_VERSION = '3';

/**
 * Write a page as a json file
 *
 * @param {Output} output
 * @param {Page} page
 */
function onPage(output, page) {
    var file = page.getFile();
    var readme = output.getBook().getReadme().getFile();

    return Modifiers.modifyHTML(page, getModifiers(output, page))
    .then(function(resultPage) {
        // Generate the JSON
        var json = JSONUtils.encodeBookWithPage(output.getBook(), resultPage);

        // Delete some private properties
        delete json.config;

        // Specify JSON output version
        json.version = JSON_VERSION;

        // File path in the output folder
        var filePath = file.getPath() == readme.getPath()? 'README.json' : file.getPath();
        filePath = PathUtils.setExtension(filePath, '.json');

        // Write it to the disk
        return writeFile(
            output,
            filePath,
            JSON.stringify(json, null, 4)
        );
    });
}

module.exports = onPage;