var fs = require("fs");

var files = Object.create(null);

fs.readdirSync(".").forEach(function(name) {

var m = /^(\d\d.*)\.txt$/.exec(name);

if (m) files[m[1]] = fs.readFileSync(name, "utf8");

});

files["22_fast"] = "[[fast]]"; // Kludge to recognize bonus chapter

files["hints"] = "[[hints]]";

var fail = 0;

function error(file, msg) {

console.error(file + ": " + msg);

fail = 1;

}

var link = /link:([^\.\s]+)\.(\w{2,5})#([^\s\[]+)\[/g, m;

for (var file in files) {

// Haha, good luck making sense of this one

var bad = /\n\n(\(\(\([^()]*?(\([^()]+\))?\)\)\))*(\(\([^(]|[^(\n]\(\(\()|\n\n\[\[[^\]]+?\]\].|[^(]\(\([^()]+?(\([^()]+?\))?\)\)\)/.exec(files[file]);

if (bad) error(file, "Suspicious notation: " + bad[0]);

while (m = link.exec(files[file])) {

if (m[2] != "html")

error(file, "Bad extension: " + m[0]);

var target = files[m[1]];

if (!target)

error(file, "Unknown target file: " + m[0]);

else if (m[3] != m[1].slice(3) && target.indexOf("[[" + m[3] + "]]") == -1)

error(file, "Non-existing anchor: " + m[0]);

}

}

process.exit(fail);