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var yaml = require('yamljs');

var fs = require('fs');

var inputFile = '';

var outputFile = '';

if (process.argv.length > 3) {

inputFile = process.argv[2];

outputFile = process.argv[3];

} else {

console.log('Please specify input and output files!');

console.log('node schema.js input.json output.yml');

}

// Simple JSON schema generator replacement

function generateSchema(obj) {

if (obj === null) {

return { type: "null" };

}

if (Array.isArray(obj)) {

if (obj.length === 0) {

return { type: "array", items: {} };

}

return {

type: "array",

items: generateSchema(obj[0])

};

}

if (typeof obj === "object") {

var schema = { type: "object", properties: {} };

for (var key in obj) {

if (obj.hasOwnProperty(key)) {

schema.properties[key] = generateSchema(obj[key]);

}

}

return schema;

}

if (typeof obj === "string") {

return { type: "string" };

}

if (typeof obj === "number") {

return { type: "number" };

}

if (typeof obj === "boolean") {

return { type: "boolean" };

}

return { type: "string" }; // fallback

}

var addTypeIfEmptyObject = function(obj) {

for(var i in obj) {

if (typeof obj[i] === "object") {

if (Object.keys(obj[i]).length === 0) {

obj[i] = {type: "object"};

} else {

addTypeIfEmptyObject(obj[i]);

}

}

}

return null;

}

fs.readFile(inputFile, 'utf8', function(err, data) {

if (err) throw err;

var json = JSON.parse(data);

var schema = generateSchema(json);

delete schema.required;

//there are some properties without types on them(they should just be set to `null`)

addTypeIfEmptyObject(schema.properties);

var yml = yaml.stringify(schema, 16, 2);

fs.writeFile(outputFile, yml, function(err) {

if (err) return console.log(err);

console.log('converted json response to yml schema');

});

});